Technical field to which the invention belongs
-
The present invention relates to a die forging method.
Prior art and problems to be solved by the invention
-
In Japanese Provisional Patent Publication number Kokai
Sho. 55(1980)-156631, there is disclosed a forming technique
in which an inner punch and an outer punch (a hollow die pin)
are respectively provided to a lower die and an upper die for
forging a metal formed product, and the punches are designed
to be independently drivable. And, after forming by an upper
and lower dies and an upper and lower outer punches, and then,
forming by an upper and lower inner punches is carried out to
improve flow of materials whereby improvement in quality of the
product can be accomplished.
-
In Japanese Provisional Patent Publication number Kokai
Sho. 58(1983)-84632, a closed type forging method for a
ultraplastic metal is described. According to this forging
method, there is disclosed that a dimensional accuracy can be
heightened by forming a void for filling at the inside of a die
by movement of a movable portion provided at a part of the die,
wherein the part moves when a forming power becomes a certain
value in the course of forging forming, and flowing an excessive
metal therein and removing the excessive part at a later stage.
-
In Japanese Patent Provisional Publication number Kokai
Hei. 1(1989)-228638, there is disclosed a forging method in
which a part of a forged material is pushed out to a side
direction in a pre-forging step and the pushed out part is formed
in a post-forging step. In this method, both steps are carried
out by using two different dies.
-
In Japanese Provisional Patent Publication number Kokai
Hei. 2(1990)-274341, there is disclosed a forging method in
which a forging material is pushed out to a side direction and
a gear is formed at the tip part of the pushed out part.
-
In Japanese Provisional Patent Publication number Kokai
Hei. 4 (1992)-17934, there is disclosed a forging method in which
a deep hole is formed by driving a punch into a forging material
while moving a die pin back under applying a back pressure
thereto.
-
In Japanese Provisional Patent Publication number Kokai
Hei. 4(1992)-344845, there is disclosed a method of forging
while gradually increasing a back pressure.
-
In Japanese Provisional Patent Publication number Kokai
Hei. 7(1995)-236937, there is disclosed a method in which an
pushed out part to the side direction is formed by compressing
a forging material using upper and lower dies, and then a punch
is driven into the forging material thereby further pushing out
the pushed out part to the side direction, and then a gear is
formed at the tip of said part.
-
At pages 109 and 110 of a Summary of the Japanese Light
Metal Association, 89th Autumn Meeting (1995), there is
disclosed a method of forging for forming a scroll for
compressor (spiral impellers) under applying a back pressure
thereto.
-
An object of the present invention is to provide a die
forging method having characteristics such as high productivity
and forming accuracy, and the like.
Means for solving the problems, and function and advantageous
effect
-
To solve the above-mentioned problems, one embodiment of
a die forging method of the present invention is:
a die forging method in which a forging material is
subjected to plastic fluidization in a forging die under
pressure to form a predetermined shape; which comprises a
pre-forging step and a hole forming step thereafter by using
an identical die, in the above-mentioned pre-forging step,
forging is carried out so that at least a part of the
above-mentioned forging material is forged to fill in a cavity
of the die to obtain a part of a shape of a formed product, and
in the above-mentioned hole forming step, the hole is formed
by driving a punch into said forging material while a die pin
is in touch with one end surface of the forging material and
moving back under applying a back pressure thereto.
-
Incidentally, in the present invention, a preferable
embodiment of "moving back under applying a back pressure
thereto" is, in the case of a die inner pressure is higher than
the back pressure, naturally moving back occurs depending on
the pressure difference.
-
In the die forging method of Japanese Provisional Patent
Publication number Kokai Sho. 55(1980)-156631, a die pin is
moved back before a forging material is filled in a die cavity
in the pre-forging step. On the other hand, in the die forging
method in this embodiment of the present invention, part of the
forging material is filled in a die cavity in a forging step
(closed forging) so that a shape of the forming part in the
pre-forging step can be accurately prepared.
-
A die forging method of another embodiment of the present
invention comprises a pre-forging step and a hole forming step
thereafter by using an identical die, in the above-mentioned
pre-forging step, a part of a shape of a formed product is
obtained and, in the above-mentioned hole forming step, a hole
is formed by driving a punch into the forging material while
a die pin is in touch with one end surface of the forging material
and moving back under applying a back pressure thereto, wherein
the die pin is not moved during the above-mentioned pre-forging
step.
-
In the die forging method of Japanese Provisional Patent
Publication number Kokai Sho. 55(1980)-156631, a die pin is
moved during a pre-forging step. On the other hand, in the die
forging method in this embodiment of the present invention, the
die pin is not moved until forming of an outer shape of a formed
product is finished so that forging can be carried out stably
and a shape of the formed part in the pre-forging step can be
accurately prepared.
-
A die forging method of another embodiment of the present
invention comprises a hole forming step and a post-forging step
thereafter by using an identical die, in the above-mentioned
hole forming step, a hole is formed by driving a punch into the
forging material while a die pin is in touch with one end surface
of the forging material and moving back under applying a back
pressure thereto and, in the above-mentioned post-forging step,
a part of a shape of a formed product is obtained by forging
at least a part of the above-mentioned forging material.
-
As for Japanese Provisional Patent Publication number
Kokai Sho. 55(1980)-156631 and Japanese Patent Publication
number Kokai Hei. 4(1992)-344845, they do not have an another
forging step after a hole forming step. On the other hand, in
the die forging method in this embodiment of the present
invention, complex and various forming can be carried out in
the post-forging step.
-
A die forging method of another embodiment of the present
invention comprises a hole forming step and a pre- or post-forging
step by using an identical die, wherein in the
above-mentioned hole forming step, a hole is formed by driving
a punch into the forging material while a die pin is in touch
with one end surface of the forging material and moving back
under applying a back pressure thereto and, in the forging step,
the above-mentioned die pin is maintained not to move basically
back against a forming pressure of the forging material.
-
In Japanese Provisional Patent Publication number Kokai
Sho. 55(1980)-156631, pressing force of the punch for pressure
forming is changed depending on the steps, but in this
embodiment of the present invention, a maintaining force of the
die pin, which is used only for back pressure and never forcing
into the forging material, is changed.
-
A die forging method of another embodiment of the present
invention comprises a hole forming step wherein a hole is formed
by driving a punch into the forging material while a die pin
is in touch with one end surface of the forging material and
moving back under applying a back pressure thereto and the
above-mentioned punch is driven from a direction other than the
moving back direction of the above-mentioned die pin or the
opposite direction of the same.
-
In Japanese Provisional Patent Publication number Kokai
Sho. 55(1980)-156631, a punch driving direction is an opposite
direction to the moving back direction of the die pin, and in
Japanese Patent Publication number Kokai Hei. 4(1992)-344845,
it is limited only to the same direction. According to the die
forging method in this embodiment of the present invention, a
punch is driven from a direction other than the moving back
direction of the die pin or the opposite direction of the above
so that a product having a complicated and various shapes, such
as a tee, can be formed.
-
In a die forging method of another embodiment of the
present invention, forging is carried out by pressurizing the
forging material using a die for die forging an outer shape of
a formed product and a punch for forming an recessed part of
the formed product in combination from the same direction, and
moving a die pin back under applying a back pressure thereto
during the forging.
-
The die disclosed in Japanese Provisional Patent
Publication number Sho. 55(1980)-156631 (Reference numeral 2'
in Fig. 10 of said publication) is not forced into while forging.
-
According to the die forging method in this embodiment
of the present invention, a product having a complicated shape,
such as shuttlecock wheel, can be formed.
-
In a die forging method of another embodiment of the
present invention, forging is carried out by pressurizing the
forging material using a plural number of punches for forming
a plural number of recessed parts from a same direction, and
moving a die pin back under applying a back pressure thereto
during the forging.
-
In Japanese Provisional Patent Publication number Kokai
Sho. 55(1980)-156631, a punch for forming a recessed part is
each one at top and bottom. On the other hand, according to
this embodiment of the present invention, forging is carried
out by pressurizing a forging material using a plural number
of punches for forming a plural number of recessed parts from
the same direction, so that a product having a complex and
various shapes, such as deep hole with steps, can be formed.
-
In the die forging method of this embodiment, forming may
be carried out by using the above-mentioned die and the punch
at different timings. Or else, forming may be carried out by
using a plural number of punches at different timings.
-
If the die and the punch (or a plural number of punches)
are operated simultaneously, there is a fear of causing a defect
such as defect unfilled material with in the forging die near
the base of the punch during forging. However, by using the
two at different timings and carrying out forming, such a defect
can be prevented.
-
In a die forging method of another embodiment of the
present invention, forging is carried out by driving a plural
number of punches into the forging material from different
directions simultaneously to carry out forming and by moving
a die pin back under applying a back pressure thereto during
the forging.
-
According to the die forging method of this embodiment
of the present invention, a forging formed product having a
complicated and various shapes, such as a tee, can be obtained.
-
A die forging method of another embodiment of the present
invention comprises a forging step by driving a punch into the
forging material or by pressing a die to the forging material
while a die pin is in touch with one end surface of said forging
material and moving back under applying a back pressure thereto,
wherein a plural number of die pins are provided to form
a plural number of holes.
-
According to the die forging method of this embodiment
of the present invention, a product with a complicated shape
having a number of holes, such as a multi-header, can be formed.
-
In the die forging method in this embodiment, it is
preferred that the above-mentioned plural number of die pins
are operated successively along a time difference and the
above-mentioned plural number of holes are successively formed.
By employing such a method, a flow of a material is simple than
simultaneously forming a plural number of holes by
simultaneously operating the die pins, so that defects such as
roll in or defect unfilled material with in the gorging die can
be reduced.
-
A die forging method of another embodiment of the present
invention comprises a forging step in which forging is completed
by advancing a punch or a die to a predetermined position by
pressing the punch or the die to the forging material while a
die pin is in touch with one end surface of the forging material
and pressured thereto, wherein in this step, when a die inner
pressure is a predetermined pressure or lower, the above-mentioned
die pin is not moved back and, when a die inner pressure
exceeds said predetermined pressure, the die pin is moved back.
-
In Japanese Provisional Patent Publication number Kokai
Sho. 55(1980)-156631, Japanese Provisional Patent Publication
number Kokai Hei. 4(1992)-344845, or Japanese Provisional
Patent Publication number Kokai Hei. 4(1992)-17934, there is
no idea to flow excess forging material out freely.
-
In Japanese Patent Publication number Kokai Sho.
58(1983)-84632, a closed type forging method for a ultraplastic
metal is disclosed, in this forging method, when a forming power
is reached to a certain value in the course of forging forming,
a void for filling is formed at a inside of a die by moving a
movable portion arranged at a part of a die, an excess metal
is poured therein, and then, the excess part is removed later
to improve a dimensional accuracy. However, according to this
method, inside of the die is not a closed state (filled up state)
when an excess metal is poured into the void for filling. In
the die forging method of this embodiment of the present
invention, the die pin is moved back depending on the pressure
of a material in the die, i.e., the die pin is moved back while
maintaining the closed state.
-
A die forging method of another embodiment of the present
invention comprises a hole-forming step by driving a punch into
the forging material while a die pin is in touch with one end
surface of the forging material and the die pin is moving back
under applying a back pressure to the forging material, wherein
a recessed or protruded part is provided at the end surface of
the above-mentioned die pin, which applies the back pressure,
and a part of product shape is formed by using the recessed or
protruded part.
-
In Japanese Provisional Patent Publication number Kokai
Sho. 55(1983)-156631 and two others, the end surface of the die
pin, which applies a back pressure, is a flat surface without
a recessed or protruded part. According to the die forging
method of this embodiment of the present invention, a protruded
part or a recessed part can be shaped at the formed surface,
thus a forged formed product having complicated and various
shapes can be obtained.
-
A die forging method of another embodiment of the present
invention comprises a pushing out step by forming an pushed out
part by forging, and a forming step by forming the pushed out
part to a predetermined shape by forging further, wherein the
above-mentioned both steps are carried out in an identical die.
-
In Japanese Provisional Patent Publication number Kokai
Hei. 1(1989)-228638, a pushing out step and a forming step are
carried out in different dies. In Japanese Provisional Patent
Publication number Kokai Hei. 2(1990)-274341 and Japanese
Provisional Patent Publication number Kokai Hei. 7(1995)-236937,
a punch or a die is not pressed to a pushed out part
and forming is carried out only by pushing out. As compared
with these prior art techniques, according to this embodiment
of the present invention, to the pushing out part pushed out
in the pushing out step, forging is carried out by a punch, etc.,
in the forming step so that a filling property of a material
is better as compared with forming only by pushing out. Also,
the pushing out step and the forming step are carried out in
an identical die so that kind of dies required decreases and
the cost of the die is less. Further, it is not necessary to
transfer the forging material to the other press during forging
so that its productivity is high.
-
A die forging method of another embodiment of the present
invention comprises a pushing out step by forming an pushed out
part by forging, and a forming step by forming the pushed out
part to a predetermined shape by forging further, wherein the
above-mentioned pushing out part is pushed out to the same
direction or the opposite direction with or to the forging in
the above-mentioned pushing out step.
-
In Japanese Provisional Patent Publication number Kokai
Hei 1(1989)-228638, a pushing out part is pushed out to the side
direction of the forging direction. "The same direction or the
opposite direction with or to the forging" in the die forging
method of this embodiment of the present invention means to push
out a part of the forging material to the same direction with
or the opposite direction of the moving direction of the die
or pin at forging. According to the die forging method, a
forging formed product having complicated and various shapes
can be obtained.
-
A die forging method of another embodiment of the present
invention comprises a pushing out step by forming a pushed out
part by forging, and a forming step by forming the pushed out
part to a predetermined shape by forging further, wherein a
forging material is forged a plural number of times in the
above-mentioned pushing out step.
-
In Japanese Provisional Patent Publication number Kokai
Hei 1(1989)-228638, upper and lower punches are simultaneously
pressed to push out. In the die forging method of this
embodiment of the present invention, since a forging material
is forged a plural number of times in the pushing out step, the
forming of the pushed out part is smoothly carried out, as
compared with the forming of all pushed out parts by one time
forging, so that a flash at the pushed out par hardly occurs.
-
In a die forging method of another embodiment of the
present invention, while driving a first punch into the forging
material, the forging material is processed by a second punch
or a die without moving said first punch back.
-
According to the die forging method of this embodiment
of the present invention, it is advantageous that a shape
deformation at the formed part by the first punch dose not occur.
-
In a die forging method of another embodiment of the
present invention, a hole is formed by driving a first punch
into a forging material, and forming around the hole by a second
punch or a die without drawing out said punch after finishing
of forming said hole.
-
In Japanese Provisional Patent Publication number Kokai
Sho. 55(1980)-156631, forging around a hole is carried out
before finishing of the hole forming. According to the die
forging method of this embodiment of the present invention,
after finishing of a hole forming, peripheral area of the hole
is formed by forming by a second punch or a die without drawing
out the punch.
-
In a die forging method of another embodiment of the
present invention, a forging material is formed to a
predetermined shape by subjecting to plastic fluidization in
a forging die under pressure; which comprises a first step by
making a cavity at a side of one end part of the above-mentioned
forging material, a second step by pressing the above-mentioned
forging material from the other side of the above-mentioned
forging material to push out said one end part of the
above-mentioned forging material and fill the above-mentioned
cavity whereby forming an outer shape thereof, thereby
obtaining a pushed out body, and a third step by driving a punch
into the above-mentioned pushed out body from said one end
surface of the end part to an axis direction after the
above-mentioned second step to form a recessed part in the
above-mentioned pushed out body.
-
By continuously forming a pushed out part and a recessed
part on the forging material, yield of the material,
productivity and forming accuracy can be heightened and forging
failure is hardly occurred. Also, an outer shape of the pushed
out part can be accurately formed.
-
Also, after forming a first recessed part, a second
recessed part with a larger diameter and shallower than the
first recessed part may be continuously formed at the pushed
out part by using a second punch arranged at an outer peripheral
of the punch. In this case, a fluidity inhibition of the
material, which occurs in the case of simultaneously forming
of the first recessed part and the second recessed part, does
not occur and defect unfilled material with in the forging die
of the pushed out part can be prevented.
-
Moreover, when a recess is provided at a part of the die
pin, a protruded part can be formed at a part of the end surface
of the forging material simultaneously with forming the pushed
out part.
-
In a die forging method of another embodiment of the
present invention, a forging material is formed to a
predetermined shape by subjecting to plastic fluidization in
a forging die under pressure; which comprises a step A by forming
an recessed part by driving a punch into the forging material
from a end surface of one end part of the above-mentioned forging
material to the axis direction, and thereafter, a step B by
forming a second recessed part with a larger diameter and
shallower than the first recessed part at the above-mentioned
end surface by using a second punch arranged at an outer
peripheral of the punch, wherein the die pin contacted to the
other end of the above-mentioned forging material is moved back
under applying a back pressure thereto.
-
Flow back, which is caused in the case that the volume
of the recessed part of the forging material is pushed up to
the opposite direction of the punch, does not occur, and the
forging material fluidizes continuously and smoothly so that
small cracks on the product do not occur. Also, a pressure of
the punch may only be set to substantially the same as the working
force to the material whereby buckling of the punch does not
occur and a depth of the recessed part can be freely set.
-
In a die forging method of another embodiment of the
present invention, a forging material is formed by subjecting
to plastic fluidization in a forging die under pressure to
obtain a formed product which has a closed bottom cylindrical
shape as a whole and also has a protruded part having an undercut;
wherein the method comprises a first step by pushing out an
starting part of the above-mentioned protruded part at the tip
of the above-mentioned forging material, and after the
above-mentioned first step, a second step by pushing out the
above-mentioned protruded part to the side direction by pushing
said original part from the opposite direction to the pushing
out direction.
-
By forming the cylindrical part and the protruded part
having an undercut continuously, yield of the material,
productivity and forming accuracy can be heightened. Also,
cracks at the cylindrical part and a defect of fold at or below
the surface layer at the undercut part can be prevented so that
forging failure can be hardly caused.
-
In a die forging method of another embodiment of the
present invention, a forging material is formed by subjecting
to plastic fluidization in a forging die under pressure to
obtain a formed product having a closed bottom cylindrical
shape; wherein the method comprises a step A by a back extrusion
forming the cylindrical part by driving a punch into the center
portion of the above-mentioned forging material while forming
the outer surface of the cylindrical part by a die cavity surface
and applying a back pressure to the end surface of the
cylindrical part,
- a step B by firstly drawing the above-mentioned punch used
for forming the above-mentioned cylindrical part when removing
the above-mentioned formed product, and
- a step C by removing the above-mentioned formed product
from the die used for forming the outer surface of the
above-mentioned cylindrical part, after the above-mentioned
step B.
-
-
By lowering a drawing force of the punch and the die,
deformation of the formed product can be prevented and the
formed product can be surely removed.
-
As clearly seen from the above explanation, according to
the present invention, die forging methods having
characteristic features such as high productivity or forming
accuracy can be provided.
BRIEF EXPLANATION OF THE DRAWINGS
-
Fig. 1 is a drawing schematically showing a structure of
a faucet made of brass and formed by the die forging method
according to the first example of the present invention, and
Fig. 1(A) is a plane view, Fig. 1(B) is a side sectional view
and Fig. 1(C) is a perspective view.
-
Fig. 2 is a sectional view schematically showing an
apparatus for forging the spout tip of faucet of Fig. 1 and
forging steps thereof.
-
Fig. 3 is a sectional view schematically showing an
apparatus for forging the spout tip of faucet of Fig. 1 and
forging steps thereof.
-
Fig. 4 is a sectional view schematically showing an
apparatus for forging the spout tip of faucet of Fig. 1 and
forging steps thereof.
-
Fig. 5 is a drawing schematically showing a construction
of a hydraulic controlling system of the forging machine for
brass material shown in Figs. 2, 3 and 4.
-
Fig. 6 is a sectional view showing enlarged details of
a lower die set 11 and a upper die set 17 of the brass material
forging machines 10 shown in Figs. 2 to 4, and a forging material
3A.
-
Fig. 7 is a sectional view showing enlarged details of
a lower die set 11 and a upper die set 17 of the brass material
forging machines 10 shown in Figs. 2 to 4, and a forging material
3A.
-
Fig. 8 is a sectional view showing enlarged details of
a lower die set 11 and a upper die set 17 of the brass material
forging machines 10 shown in Figs. 2 to 4, and a forging material
3A.
-
Fig. 9 is a sectional view showing enlarged details of
a lower die set 11 and a upper die set 17 of the brass material
forging machines 10 shown in Figs. 2 to 4, and a forging material
3A.
-
Fig. 10 is a stroke diagram of the die or punch during
forging forming.
-
Fig. 11 is a sectional view showing the structure of a
flange formed by the die forging method according to the second
example of the present invention.
-
Fig. 12 is a sectional view showing a semi-finished forged
product of the flange of Fig. 11.
-
Fig. 13 is a sectional view schematically showing an
apparatus and forging steps for forging the semi-finished
forged product of the flange of Fig. 12.
-
Fig. 14 is a sectional view schematically showing an
apparatus and forging steps for forging the semi-finished
forged product of the flange of Fig. 12.
-
Fig. 15 is a sectional view schematically showing an
apparatus and forging steps for forging the semi-finished
forged product of the flange of Fig. 12.
-
Fig. 16 is a sectional view schematically showing an
apparatus and forging steps for forging the semi-finished
forged product of the flange of Fig. 12.
-
Fig. 17 is a sectional view schematically showing an
apparatus and forging steps for forging the semi-finished
forged product of the flange of Fig. 12.
-
Fig. 18 is a drawing showing the structure of a shuttlecock
wheel according to the third example of the present invention,
and Fig. 18(A) is a plane view and Fig. 18(B) is a sectional
view.
-
Fig. 19 is a drawing showing the structure of the
semi-finished forged product of the shuttlecock wheel of Fig.
18, and Fig. 19(A) is a plane view and Fig. 19(B) is a sectional
view.
-
Fig. 20 is a sectional view schematically showing an
apparatus and forging steps for forging the semi-finished
forged product of the shuttlecock wheel of Fig. 19.
-
Fig. 21 is a sectional view schematically showing an
apparatus and forging steps for forging the semi-finished
forged product of the shuttlecock wheel of Fig. 19.
-
Fig. 22 is a sectional view schematically showing an
apparatus and forging steps for forging the semi-finished
forged product of the shuttlecock wheel of Fig. 19.
-
Fig. 23 is a sectional view schematically showing an
apparatus and forging steps for forging the semi-finished
forged product of the shuttlecock wheel of Fig. 19.
-
Fig. 24 is a sectional view schematically showing an
apparatus and forging steps for forging the semi-finished
forged product of the shuttlecock wheel of Fig. 19.
-
Fig. 25 is a sectional view schematically showing an
apparatus and forging steps for forging the semi-finished
forged product of the shuttlecock wheel of Fig. 19.
-
Fig. 26 is a sectional view schematically showing an
apparatus and forging steps for forging the semi-finished
forged product of the shuttlecock wheel of Fig. 19.
-
Fig. 27 is a sectional view schematically showing an
apparatus and forging steps of another example for forging the
semi-finished forged product of the shuttlecock wheel of Fig.
19.
-
Fig. 28 is a sectional view schematically showing an
apparatus and forging steps of another example for forging the
semi-finished forged product of the shuttlecock wheel of Fig.
19.
-
Fig. 29 is a sectional view schematically showing an
apparatus and forging steps of another example for forging the
semi-finished forged product of the shuttlecock wheel of Fig.
19.
-
Fig. 30 is a sectional view schematically showing an
apparatus and forging steps of another example for forging the
semi-finished forged product of the shuttlecock wheel of Fig.
19.
-
Fig. 31 is a sectional view schematically showing an
apparatus and forging steps of another example for forging the
semi-finished forged product of the shuttlecock wheel of Fig.
19.
-
Fig. 32 is a sectional view schematically showing an
apparatus and forging steps of another example for forging the
semi-finished forged product of the shuttlecock wheel of Fig.
19.
-
Fig. 33 is a sectional view schematically showing an
apparatus and forging steps of another example for forging the
semi-finished forged product of the shuttlecock wheel of Fig.
19.
-
Fig. 34 is a sectional view schematically showing an
apparatus and forging steps of another example for forging the
semi-finished forged product of the shuttlecock wheel of Fig.
19.
-
Fig. 35 is a sectional view schematically showing an
apparatus and forging steps of another example for forging the
semi-finished forged product of the shuttlecock wheel of Fig.
19.
-
Fig. 36 is a sectional view schematically showing an
apparatus and forging steps of another example for forging the
semi-finished forged product of the shuttlecock wheel of Fig.
19.
-
Fig. 37 is a sectional view schematically showing an
apparatus and forging steps of another example for forging the
semi-finished forged product of the shuttlecock wheel of Fig.
19.
-
Fig. 38 is a drawing showing the structure of a water meter
formed by the die forging method according to the sixth example
of the present invention, and Fig. 38(A) is a front sectional
view and Fig. 38(B) is a partial sectional plane view.
-
Fig. 39 is a drawing showing the structure of the
semi-finished forged product of the water meter of Fig. 38, and
Fig. 39(A) is a front sectional view and Fig. 39(B) is a partial
sectional plane view.
-
Fig. 40 is a sectional view schematically showing an
apparatus and forging steps for forging the semi-finished
forged product of the water meter of Fig. 39.
-
Fig. 41 is a sectional view schematically showing an
apparatus and forging steps for forging the semi-finished
forged product of the water meter of Fig. 39.
-
Fig. 42 is a sectional view schematically showing an
apparatus and forging steps for forging the semi-finished
forged product of the water meter of Fig. 39.
-
Fig. 43 is a sectional view schematically showing an
apparatus and forging steps for forging the semi-finished
forged product of the water meter of Fig. 39.
-
Fig. 44 is a sectional view schematically showing an
apparatus and forging steps for forging the semi-finished
forged product of the water meter of Fig. 39.
-
Fig. 45 is a sectional view schematically showing an
apparatus and forging steps for forging the semi-finished
forged product of the water meter of Fig. 39.
-
Fig. 46 is a sectional view schematically showing an
apparatus and forging steps for forging the semi-finished
forged product of the water meter of Fig. 39.
-
Fig. 47 is a sectional view schematically showing an
apparatus and forging steps for forging the semi-finished
forged product of the water meter of Fig. 39.
-
Fig. 48 is a sectional view schematically showing an
apparatus and forging steps for forging the semi-finished
forged product of the water meter of Fig. 39.
-
Fig. 49 is a drawing showing a SCC( Stress Corrosion
Cracking) resistance test equipment.
-
Fig. 50 is a drawing showing a erosion resistance test
equipment.
-
Fig. 51 is a graph showing erosion resistance test
results.
-
Fig. 52 is a drawing showing the structure of a lightening
shaft formed by the die forging method according to the seventh
example of the present invention, and Fig. 52(A) is a
perspective view and Fig. 52(B) is a sectional view.
-
Fig. 53 is a drawing showing the structure of the
semi-finished forged product of the lightening shaft of Fig.
52, and Fig. 53(A) is a perspective view and Fig. 53(B) is a
sectional view.
-
Fig. 54 is a sectional view schematically showing an
apparatus and forging steps for forging the semi-finished
forged product of the lightening shaft of Fig. 53.
-
Fig. 55 is a sectional view schematically showing an
apparatus and forging steps for forging the semi-finished
forged product of the lightening shaft of Fig. 53.
-
Fig. 56 is a sectional view schematically showing an
apparatus and forging steps for forging the semi-finished
forged product of the lightening shaft of Fig. 53.
-
Fig. 57 is a drawing showing the structure of a lightening
shaft formed by the die forging method according to the eighth
example of the present invention, and Fig. 57(A) is a
perspective view and Fig. 57(B) is a sectional view.
-
Fig. 58 is a drawing showing the structure of the
semi-finished forged product of the lightening shaft of Fig.
57, and Fig. 58(A) is a perspective view and Fig. 53(B) is a
sectional view.
-
Fig. 59 is a sectional view schematically showing an
apparatus and forging steps for forging the semi-finished
forged product of the lightening shaft of Fig. 58.
-
Fig. 60 is a sectional view schematically showing an
apparatus and forging steps for forging the semi-finished
forged product of the lightening shaft of Fig. 58.
-
Fig. 61 is a sectional view schematically showing an
apparatus and forging steps for forging the semi-finished
forged product of the lightening shaft of Fig. 58.
-
Fig. 62 is a sectional view schematically showing an
apparatus and forging steps for forging the semi-finished
forged product of the lightening shaft of Fig. 58.
-
Fig. 63 is a drawing showing the structure of a hand shower
supporting fitting formed by the die forging method according
to the ninth example of the present invention, and Fig. 63(A)
is a plane sectional view and Fig. 63(B) is a side surface
sectional view.
-
Fig. 64 is a sectional view schematically showing an
apparatus and forging steps for forging the semi-finished
forged product of the hand shower supporting fitting of Fig.
63.
-
Fig. 65 is a sectional view schematically showing an
apparatus and forging steps for forging the hand shower
supporting fitting of Fig. 63.
-
Fig. 66 is a sectional view schematically showing an
apparatus and forging steps for forging the hand shower
supporting fitting of Fig. 63.
-
Fig. 67 is a sectional view schematically showing an
apparatus and forging steps for forging the hand shower
supporting fitting of Fig. 63.
-
Fig. 68 is a sectional view schematically showing an
apparatus and forging steps for forging the hand shower
supporting fitting of Fig. 63.
-
Fig. 69 is a sectional view schematically showing an
apparatus and forging steps for forging the hand shower
supporting fitting of Fig. 63.
-
Fig. 70 is a drawing showing the structure of a flush valve
lid formed by the die forging method according to the tenth
example of the present invention.
-
Fig. 71 is a sectional view schematically showing an
apparatus and forging steps for forging the hand shower
supporting fitting of Fig. 70.
-
Fig. 72 is a sectional view schematically showing an
apparatus and forging steps for forging the hand shower
supporting fitting of Fig. 70.
-
Fig. 73 is a sectional view schematically showing an
apparatus and forging steps for forging hand shower supporting
fitting of Fig. 70.
-
Fig. 74 is a sectional view schematically showing an
apparatus and forging steps for forging the hand shower
supporting fitting of Fig. 70.
-
Fig. 75 is a sectional view schematically showing an
apparatus and forging steps for forging the hand shower
supporting fitting of Fig. 70.
-
Fig. 76 is a sectional view schematically showing an
apparatus and forging steps for forging the hand shower
supporting fitting of Fig. 70.
-
Fig. 77 is a sectional view schematically showing an
apparatus and forging steps for forging hand shower supporting
fitting of Fig. 70.
-
Fig. 78 is a side surface sectional view showing the
structure of a H-shaped bushing formed by the die forging method
according to the eleventh example of the present invention.
-
Fig. 79 is a sectional view schematically showing an
apparatus and forging steps for forging the H-shaped bushing
of Fig. 78.
-
Fig. 80 is a sectional view schematically showing an
apparatus and forging steps for forging the H-shaped bushing
of Fig. 78.
-
Fig. 81 is a side surface sectional view showing the
structure of a tee formed by the die forging method according
to the twelfth example of the present invention.
-
Fig. 82 is a sectional view schematically showing an
apparatus and forging steps for forging the tee of Fig. 81.
-
Fig. 83 is a sectional view schematically showing an
apparatus and forging steps for forging the tee of Fig. 81.
-
Fig. 84 is a sectional view schematically showing an
apparatus and forging steps for forging the tee of Fig. 81.
-
Fig. 85 is a sectional view schematically showing an
apparatus and forging steps for forging the tee of Fig. 81.
-
Fig. 86 is a sectional view schematically showing an
apparatus and forging steps for forging the tee of Fig. 81.
-
Fig. 87 is a side sectional view showing the structure
of a multi header formed by the die forging method according
to the thirteenth example of the present invention.
-
Fig. 88 is a sectional view schematically showing an
apparatus and forging steps for forging the multi header of Fig.
87.
-
Fig. 89 is a sectional view schematically showing an
apparatus and forging steps for forging the multi header of Fig.
87.
-
Fig. 90 is a sectional view schematically showing an
apparatus and forging steps for forging the multi header of Fig.
87.
-
Fig. 91 is an assembling drawing showing a faucet
apparatus according to the fourteenth example of the present
invention.
-
Fig. 92 is a drawing of parts of the faucet apparatus of
Fig. 1 in which machining has finished, and Fig. 92(A) is a plane
view, Fig. 92(B) is a longitudinal sectional view and Fig. 92(C)
is a side view.
-
Fig. 93 is a drawing showing an semi-finished forged
product of the parts of the faucet apparatus of Fig. 92, and
Fig. 93(A) is a plane view, Fig. 93(B) is a longitudinal
sectional view and Fig. 93(C) is a side view.
-
Fig. 94 is a plane view schematically showing an apparatus
for forging the semi-finished forged product of the parts of
the faucet apparatus of Fig. 93.
-
Fig. 95 is a side sectional view schematically showing
an apparatus for forging the semi-finished forged product of
the parts of the faucet apparatus of Fig. 93.
-
Fig. 96 is a sectional view schematically showing a step
for forging the semi-finished forged product of the parts of
the faucet apparatus of Fig. 93.
-
Fig. 97 is a sectional view schematically showing a step
for forging the semi-finished forged product of the parts of
the faucet apparatus of Fig. 93.
-
Fig. 98 is a sectional view schematically showing a step
for forging the semi-finished forged product of the parts of
the faucet apparatus of Fig. 93.
-
Fig. 99 is a sectional view schematically showing a step
for forging the semi-finished forged product of the parts of
the faucet apparatus of Fig. 93.
-
Fig. 100 is a sectional view schematically showing a step
for forging the semi-finished forged product of the parts of
the faucet apparatus of Fig. 93.
-
Fig. 101 is a drawing showing the structure of a shower
hanger according to the fifteenth example of the present
invention, and Fig. 101(A) is a perspective view, Fig. 101(B)
is a side view, Fig. 101(C) is a front view and Fig. 101(D) is
a plane view.
-
Fig. 102 is a sectional view schematically showing an
apparatus and forging steps for forging the shower hanger of
Fig. 101.
-
Fig. 103 is a sectional view schematically showing an
apparatus and forging steps for forging the shower hanger of
Fig. 101.
-
Fig. 104 is a sectional view schematically showing an
apparatus and forging steps for forging the shower hanger of
Fig. 101.
-
Fig. 105 is a sectional view schematically showing an
apparatus and forging steps for forging the shower hanger of
Fig. 101.
-
Fig. 106 is a sectional view schematically showing an
apparatus and forging steps for forging the shower hanger of
Fig. 101.
-
Fig. 107 is a sectional view schematically showing an
apparatus and forging steps for forging the shower hanger of
Fig. 101.
-
Fig. 108 is a sectional view schematically showing an
apparatus and forging steps for forging the shower hanger of
Fig. 101.
-
Fig. 109 is a longitudinal sectional view showing the
structure of a part X according to the sixteenth example of the
present invention.
-
Fig. 110 is a drawing schematically showing an apparatus
and forging steps for forging the part X of Fig. 1.
-
Fig. 111 is a drawing schematically showing an apparatus
and forging steps for forging the part X of Fig. 1.
-
Fig. 112 is a drawing schematically showing an apparatus
and forging steps for forging the part X of Fig. 1.
-
Fig. 113 is a drawing schematically showing an apparatus
and forging steps for forging the part X of Fig. 1.
-
Fig. 114 is a drawing schematically showing an apparatus
and forging steps for forging the part X of Fig. 1.
-
Fig. 115 is a drawing schematically showing an apparatus
and forging steps for forging the part X of Fig. 1.
-
Fig. 116 is a drawing schematically showing an apparatus
and forging steps for forging the part X of Fig. 1.
-
Fig. 117 is a drawing schematically showing an apparatus
and forging steps for forging the part X of Fig. 1.
-
Fig. 118 is a drawing schematically showing an apparatus
and forging steps for forging the part X of Fig. 1.
-
Fig. 119 is a drawing schematically showing an apparatus
and forging steps for forging the part X of Fig. 1.
-
Fig. 120 is a longitudinal sectional view showing the
structure of a part Y according to the sixteenth example of the
present invention.
-
Fig. 121 is a drawing schematically showing an apparatus
and forging steps for forging the part Y of Fig. 120.
-
Fig. 122 is a drawing schematically showing an apparatus
and forging steps for forging the part Y of Fig. 120.
-
Fig. 123 is a drawing schematically showing an apparatus
and forging steps for forging the part Y of Fig. 120.
-
Fig. 124 is a drawing schematically showing an apparatus
and forging steps for forging the part Y of Fig. 120.
-
Fig. 125 is a drawing schematically showing an apparatus
and forging steps for forging the part Y of Fig. 120.
-
Fig. 126 is a drawing schematically showing an apparatus
and forging steps for forging the part Y of Fig. 120.
-
Fig. 127 is a drawing schematically showing an apparatus
and forging steps for forging the part Y of Fig. 120.
-
Fig. 128 is a drawing schematically showing an apparatus
and forging steps for forging the part Y of Fig. 120.
-
Fig. 129 is a drawing schematically showing an apparatus
and forging steps for forging the part Y of Fig. 120.
-
Fig. 130 is a drawing schematically showing an apparatus
and forging steps for forging the part Y of Fig. 120.
-
Fig. 131 is a longitudinal sectional view showing the
structure of a part Z according to the seventeenth example of
the present invention.
-
Fig. 132 is a drawing schematically showing an apparatus
and forging steps for forging the part Z of Fig. 131.
-
Fig. 133 is a drawing schematically showing an apparatus
and forging steps for forging the part Z of Fig. 131.
-
Fig. 134 is a sectional view schematically showing an
apparatus and forging steps for forging the part Z of Fig. 131.
-
Fig. 135 is a drawing schematically showing an apparatus
and forging steps for forging the part Z of Fig. 131.
-
Fig. 136 is a drawing schematically showing an apparatus
and forging steps for forging the part Z of Fig. 131.
-
Fig. 137 is a drawing schematically showing an apparatus
and forging steps for forging the part Z of Fig. 131.
-
Fig. 138 is a drawing schematically showing an apparatus
and forging steps for forging the part Z of Fig. 131.
-
Fig. 139 is a drawing schematically showing an apparatus
and forging steps for forging the part Z of Fig. 131.
-
Fig. 140 is a drawing schematically showing an apparatus
and forging steps for forging the part Z of Fig. 131.
-
Fig. 141 is a drawing schematically showing an apparatus
and forging steps for forging the part Z of Fig. 131.
EMBODIMENTS OF THE INVENTION
-
In the following, explanation will be made by referring
to the drawings.
-
Fig. 1 is a drawing schematically showing a structure of
a faucet made of brass and formed by the die forging method
according to the first example of the present invention, and
Fig. 1(A) is a plane view, Fig. 1(B) is a side sectional view
and Fig. 1(C) is a perspective view.
-
In faucets equipped at a kitchen or a bathroom, a part
called a spout is provided. At an inside portion near to the
tip of the spout, a spout tip of faucet 3 made of brass has been
attached.
-
The upper end part of the spout tip of faucet 3 made of
brass of this example is substantially a D-shaped inserted part
4. At the edge of the inserted part 4, an inclined surface 4a
as a guide is provided. And, at the spout tip of faucet 3, a
flange part 5 having a diameter slightly larger than the
inserted part 4, a stepped inserted part 6, and a recessed and
protruded part 7 extending to downward from the stepped inserted
part 6 are integrally provided. This recessed and protruded
part 7 is a relatively small sized closed bottom cylindrical
shape having a protruded part 7b with a circular sectional shape
and a recessed part 7a at the inside thereof. The protruded
part 7b is formed on a extended line of the recessed part forming
direction at the same time of forming with the recessed part
7a.
-
As will be mentioned below, the part other than the
recessed and protruded part 7 can be formed in a final state
by forming the brass material to the state, in which a volume
of a forming cavity becomes substantially equal to the volume
of the brass material (a state in which the forging material
is fulfilled in the cavity) after die-clamping and an early
stage of forming (pre-forging step). And the recessed and
protruded part 7 is continuously formed in a following deep hole
forming step.
-
The spout tip of faucet 3 has a plural number of sharp
edge parts 6a. In the above-mentioned pre-forging step, these
plural number of sharp edge parts 6a can be also formed with
high accuracy.
-
Next, a preferred property of the preferred brass
material as mentioned above will be explained. This brass
material preferably has the following crystal structure in
order to lower flow stress at the time of forging forming.
- (a) It comprises a crystal structure having an average
crystal grain diameter of 15 µm or lower,
- (b) an apparent Zn content is 37 to 50% by weight, an Sn
content is 1.7 to 2.2% by weight, and
- (c) a crystal structure having an areal ratio of an α phase
being 44 to 65%, an areal ratio of a β phase being 10 to 55%
and an areal ratio of a γ phase being 1 to 25%.
-
-
Fig. 2 to Fig. 4 are sectional views schematically showing
the apparatus and forging steps for forging the spout tip of
faucet of Fig. 1.
-
The brass material forging machine 10 has a body flame
(not shown in the drawing), a lower die set 11, and an upper
die set 17 corresponding to the lower die set 11. The lower
die set 11 has a lower die 12, a die pin 13, and a first hydraulic
cylinder 14 which can retain and drive the die pin 13 up and
down. The lower die 12 is fixed and the upper surface of the
lower die 12 is flat. At the center portion of this lower die
12, a pin inserting hole 15 extending to the vertical direction
with a circular sectional surface is provided. The die pin 13
is slidably mounted up and down in the pin inserting hole 15.
By the pin inserting hole 15 and the die pin 13, an outer shape
of the recessed and protruded part 7 of the spout tip of faucet
3 is formed.
-
Near the pin inserting hole 15 on the upper surface of
the lower die 12, a step forming hole 16 (also refer to Fig.
6) is formed, which is connected to the upper end of the pin
inserting hole 15. This step forming hole 16 is provided to
form a stepped inserted part 6 of the spout tip of faucet 3.
-
The first hydraulic cylinder 14 is provided at the
downward of the die pin 13 to the vertical direction, and the
upper end part of a piston rod 14a of the first hydraulic cylinder
14 is connected to the die pin 13. By the first hydraulic
cylinder 14, the die pin 13 can be retained at the position shown
in Fig. 3 or Fig. 4, also is pulled down while applying a
retaining force to the die pin 13. Furthermore, by the cylinder
14, the die pin 13 can be moved to upward to eject the spout
tip of faucet 3 after forming.
-
The upper die set 17 has an upper slide 18 and an upper
die 19. The upper die set 17 also has an upper outer punch 20
and an upper inner punch 21. The upper slide 18 moves up and
down by a main hydraulic cylinder 22. The upper inner punch
21 moves up and down by a third hydraulic cylinder 23. The upper
slide 18 is movably guided vertically up and down along a guided
part, which is slidably engaged to a guide part provided at the
body flame, and moved up and down by the main hydraulic cylinder
22.
-
At the center portion of the lower part of the upper slide
18, a recessed part 24 with a circular sectional shape is so
provided as to open at a lower surface. At least upper tip part
of the upper die 19 is slidably mounted up and down in the
recessed part 24. At the upper end part of the upper die 19,
a flange part 19a is formed and said flange part 19a is stopped
to a stopping plate 25 fixed to the lower surface of the upper
slide 18.
-
The lower surface of the upper die 19 is provided to be
a flat surface contacting with the upper surface of the lower
die 12. At the upper part of the upper die 19, a plural number
of springs receiving holes 26 are so formed that whose upper
end is open. To these spring receiving holes 26, compression
springs 27 are inserted, respectively. The upper end of these
compression springs 27 are supported by the upper end wall
surface of the recessed part 24, and the upper die 19 is
elastically biased strongly downward by these compression
springs 27.
-
At the center part of the upper die 19, a punch inserting
hole 28 having substantially D-shaped sectional shape is
provided to the vertical direction, into which the upper outer
punch 20 and the upper inner punch 21 can be fed into. Into
the punch inserting hole 28, the upper outer punch 20 and the
upper inner punch 21 are slidably inserted.
-
At the lower surface part of the upper die 19, a flange
forming part 29 (also refer to Fig. 6) positioned at the outside
of the punch inserting hole 28 is provided. This flange forming
part 29 is provided to form the flange part 5 of the spout tip
of faucet 3. At the die-clamped state of Fig. 2, the flange
forming part 29 of the upper die 19 is connected to the step
forming part 16 of the lower die 12.
-
The upper outer punch 20 is integrally formed with the
upper slide 18, and slidably inserted into the punch inserting
hole 28. The outer shape of the sectional surface of the upper
outer punch 20 is provided to be a substantially D-shape. At
the lower tip part of the upper outer punch 20, a inserted part
forming part 30 (also refer to Fig. 6) for forming the inserted
part 4 of the spout tip of faucet 3 is formed. As shown in Fig.
2, in the die-clamped state, the inserted part forming part 30
is spatially connected to the step forming part 16.
-
The upper inner punch 21 is mainly provided to form the
recessed and protruded portion 7 of the spout tip of faucet 3
and has a circular sectional shape. The upper inner punch 21
is slidably inserted into an inner punch inserting hole 31 up
and down at the center portion of the upper outer punch 20. The
upper inner punch 21 is connected to the piston rod 23a of the
third hydraulic cylinder 23 provided over thereof and drivable
up and down by the cylinder 23 freely movable up and down.
-
Incidentally, in Fig. 2, a brass raw material 3A with a
short column shape is set in a die. The brass raw material 3A
is formed to the spout tip of faucet 3 shown in Fig. 4 through
an semi-finished formed material 3B shown in Fig. 3.
-
Next, hydraulic control systems of the brass material
forging machine shown in Figs. 2, 3 and 4 are explained.
-
Fig. 5 is a drawing schematically showing a construction
of a hydraulic controlling system of the brass material forging
machine shown in Figs. 2, 3 and 4.
-
This hydraulic control system has a hydraulic feeding
machine 41 which feeds a hydraulic pressure to a first hydraulic
cylinder 14, a second hydraulic cylinder 22 and a third
hydraulic cylinder 23. Also, it has a hydraulic circuit
containing electromagnetic directional switching valves 42 to
44 and electromagnetic proportional relief valves 45 and 46.
Also, it has a plural number of detection switches 47 and control
units 48. The hydraulic feeding machine 41 has a hydraulic pump,
a driving motor, an oil tank, etc. which are not shown in the
drawing.
-
The electromagnetic directional switching valve 42 is
provided at an oil line that feeds a hydraulic pressure to the
second hydraulic cylinder 22, the electromagnetic directional
switching valve 43 is provided at an oil line that feeds a
hydraulic pressure to the first hydraulic cylinder 14, and the
electromagnetic directional switching valve 44 is provided at
an oil line that feeds a hydraulic pressure to the third
hydraulic cylinder 23.
-
The electromagnetic proportional relief valves 45 is
connected to an oil line that feeds a hydraulic pressure to the
first hydraulic cylinder 14, and a hydraulic pressure set at
the electromagnetic proportional relief valves 45 is fed to the
cylinder 14. According to the arrangement of the
electromagnetic proportional relief valves 45, a back pressure
of the die pin 13 is controlled. Similarly, the electromagnetic
proportional relief valves 46 is connected to an oil line to
feed a hydraulic pressure to the third hydraulic cylinder 23,
and a hydraulic pressure controlled by the electromagnetic
proportional relief valves 46 is fed to the cylinder 23.
-
A plural number of detection switches 47 contains a
detection switch for detecting the upper limit position and the
lower limit position of the upper die 19, a detection switch
for detecting the upper limit position and the lower limit
position of the upper inner punch 21, etc.
-
A control unit 48 has a microcomputer and input-output
interface. In the ROM of the microcomputer, a control program
is stored for controlling the hydraulic feeding machine 41, the
electromagnetic directional switching valves 42 to 44 and the
electromagnetic proportional relief valves 45 and 46 based on
the detection signal from a plural number of the detection
switches 47. The microcomputer carriers out controlling
according to the control program.
-
Next, a method of forging and forming the spout tip of
faucet 3 by using the above-mentioned forging machine 10 is
explained in detail.
-
Figs. 6 to 9 are sectional views showing enlarged details
of a lower die set 11 and an upper die set 17 of the brass material
forging machine 10 shown in Figs. 2 to 4, and a forging material
3A.
-
Fig. 10 is a stroke diagram of the die or punch during
forging forming.
-
First, as shown in Fig. 6, in the state that the upper
inner punch 21 and the upper outer punch 20 are lifted, the
forging material 3A made of the brass material heated at about
300 to 600°C is set in the step forming hole 16 of the lower
die 12. However, during the forging forming mentioned below,
the brass raw material 3A is formed under maintaining the
temperature to 550°C or lower. Here, to realize flashless
forming, the volume of the brass raw material 3A is so set as
to equal to the net volume of the spout tip of faucet 3.
-
Next, as shown in Fig. 7, the upper die 19 is fed down
to contact the lower surface of the upper die 19 to the upper
surface of the lower die 12 and to die-clamp the upper die set
17 to the lower die set 11. This clamping is carried out by
switching the electromagnetic directional switching valve 42
shown in Fig. 5 to extend a piston rod 22a of the second hydraulic
cylinder 22 and going down the upper slide 18. At the die-clamping
state, the lower end of the upper outer punch 20 and
the lower end of the upper inner punch 21 is located on a
coincident plane, and closely faced to the upper end surface
of the brass raw material 3A. This state corresponds to time
t1 to t2 of Fig. 10.
-
Next, a setting pressure of the electromagnetic
proportional relief valve 45 is set to a high pressure to set
a retaining force (a pressing force or a supporting force) of
the die pin 13 to a high value. At the same time, by operating
the electromagnetic directional switching valve 43, the first
hydraulic cylinder 14 is driven to set the height position of
the die pin 13 so that the upper end of the die pin 13 is located
on a coincident plane with the lower end of the step forming
hole 16 as shown in Fig. 8. When the position of the die pin
13 is determined, then the electromagnetic directional
switching valve 43 is switched to the block position a.
-
Next, the upper outer punch 20 and the upper inner punch
21 are integrally driven to go down and, as shown in Fig. 8,
the brass raw material 3A is formed to the state that the volume
of the forming cavity C becomes substantially equal to the
volume of the brass raw material 3A. At this state, forming
(pre-forging step) of parts other than the recessed and
protruded part 7 (refer to Fig. 9) (that is, the inserted part
4, the flange part 5 and the stepped inserted part 6) is finished.
During this forming, at the state in setting pressures of the
electromagnetic proportional relief valves 45 and 46 to high
pressure, the electromagnetic directional switching valves 42
and 44 are switched to synchronously drive the piston rod 22a
of the second hydraulic cylinder 22 and the piston rod 23a of
the third hydraulic cylinder 23 down.
-
During the pre-forging step, the electromagnetic
directional switching valve 43 is retained at the block position
a. Since an oil in the hydraulic system is a non-compressive
fluid, an oil pressure of a head side oil room (lower side oil
room) of the first hydraulic cylinder 14 is maintained at a high
level during the pre-forging step and the die pin 13 does not
move back downward. Accordingly, in the pre-forging step, the
brass raw material 3A is formed into a semi-finished formed
material 3B as shown in Fig. 8 (or Fig. 3) by a closed forging.
This state corresponds to the time t2 to t3 of Fig. 10.
-
Next, as shown in Fig. 9, the upper inner punch 21 is moved
downward and also the die pin 13 is moved back downward.
According to this action, the recessed and protruded part 7 is
formed continuously following to the above-mentioned pre-forging
step. During this deep hole forming, the
electromagnetic proportional relief valve 45 is switched to a
lower pressure than the pressure of the upper inner punch 21,
the electromagnetic directional switching valve 43 is switched
to a rod moving back position b, and further the retention force
(back pressure) of the die pin 13 is retained to low value through
a throttle 43a of the rod moving back position b of the
electromagnetic directional switching valve 43. This state
corresponds to the time t3 to t4 of Fig. 10.
-
By setting the value of the electromagnetic proportional
relief valve 45 to a sufficiently low value, and setting
suitably the degree of the throttle 43a of the electromagnetic
directional control valve 43 in relation to the going down rate
of the upper inner punch 21, a hydraulic pressure of a head side
oil room of the first hydraulic cylinder 14 can be maintained
to a low value. Also, a going down force of the upper inner
punch 21 is optionally set through the electromagnetic
proportional relief valve 46 and the setting pressure is set
to a relatively low pressure capable of forming.
-
Incidentally, in the deep hole forming step, the recessed
and protruded part 7 is formed by using a part of the material
of the semi-finished formed product 3B shown in Fig. 8, which
is located under the upper inner punch 21. Thus, the volume
of the brass material at the part is so set that it is
substantially equal to the net volume of the recessed and
protruded part 7. If this condition is satisfied, the position
of the upper end of the die pin 13 during forming the semi-finished
formed product 3B is not limited to the positions shown
in Fig. 7 and Fig. 8, and may be set slightly higher or lower
than the position shown in the drawings.
-
After finishing of the above-mentioned forging forming,
the upper die set 17 is returned to the upper limit position.
Next, the die pin 13 is elevated to the upper limit position
by the hydraulic cylinder 14. Accordingly, the spout tip of
faucet 3 which forming is finished is ejected to remove from
the lower die set 11.
-
According to the forging forming method as mentioned
above, the following function and effects can be obtained.
- (1) In the pre-forging step, in the state that the retaining
force of the die pin 13 is set sufficiently high and the die
pin 13 is retained at the predetermined position, the brass raw
material 3A is formed to the state that the volume of the forming
cavity C becomes substantially equal to the volume of the brass
raw material 3A (until the forging material is filled in the
cavity C), whereby forming of the part other than the recessed
and protruded part 7 (the inserted part 4, the flange part 5
and the stepped inserted part 6) is finished. Accordingly,
before starting the forming of the recessed and protruded part
7, the parts other than the recessed and protruded part 7 can
be formed substantially without flash at good accuracy. In
particular, the parts other than the recessed and protruded part
7 can be upsettingly formed similarly to the forging under a
hydrostatic pressure so that crack defect caused by frictional
force acting between the brass material and the lower die 12
hardly occurs.
- (2) In the pre-forging step, when the piston rod 14a of the
hydraulic cylinder 14 is constructed to be able to move back
while maintaining the retaining force for retaining the die pin
13 relatively high, weight distribution of the brass raw
material 3A can be absorbed by moving said piston rod 14a back.
- (3) In the deep hole forming step, following the forming of a
part other than the recessed and protruded part 7, while the
part other than the recessed and protruded part 7 is closed in
the die, the upper inner punch 21 is went down to drive the punch
21 into the forging material 3A. At this time, the retaining
force of the die pin 13 is switched to low and the recessed and
protruded part 7 is formed while moving the die pin 13 back under
applying thereto back pressure. Thus, the brass material does
not fluidize to upward during forming of the recessed and
protruded part 7 so that the recessed and protruded part 7 can
be formed at good precision without flash even if a pressing
force of the upper inner punch 21 is not so heightened.
- (4) In the deep hole forming step, the brass material does not
fluidize back upward during forming of the recessed and
protruded part 7 so that a defect of fold at or below the surface
due to difference of fluidization of the brass material at the
edge part 16a is hardly generated. Accordingly, a sharp shaped
part having an edge part 16a can be formed. Also, during forming
of the recessed and protruded part 7, the material does not
fluidize to upward, and increase of resistance due to frictional
force caused between the brass material and the lower die 13
dose not occur so that it is not necessary to heighten the
pressing force of the upper inner punch 21 whereby buckling of
the upper inner punch 21 is hardly generated and durability is
improved.
- (5) A first hydraulic cylinder 14 is used as a retaining means
to retain the die pin 13 and the retaining force of the die pin
13 is changed by changing the hydraulic pressure of the head
side oil room of the first hydraulic cylinder 14 whereby the
retaining force of the die pin 13 can be optionally controlled.
- (6) Forging forming is carried out at the state of maintaining
the temperature of the brass material at 550°C or lower so that,
even a member having a shape, which the depth of the recessed
portion 7a thereof is deep and a long forging time is required,
can be always forged at a constant flow stress. Incidentally,
the temperature of 550°C is a tempering temperature or lower
of a hot tool steel (JIS SKD61, etc.) usually used for this kind
of a die so that durability of the die can be sufficiently
ensured.
-
-
In the die forging method as mentioned above, as the
forging material, brass having good workability is one of the
preferred materials. However, for using it as water facilities
for a house, the conventionally used brass involved problems
in corrosion resistance, etc. as compared with bronze. However,
if the formed product after cooling is at least one of the crystal
structures of (1) to (3) shown below, the problem of corrosion
resistance, etc. can be below an allowable level.
- (1) a crystal structure wherein areal ratios of an α+β
phase and a β phase are 20% or higher, average crystal grain
sizes of an α phase and a β phase are 15 µm or smaller, and an
Sn concentration in the β phase is 1.5 wt% or more,
- (2) a crystal structure wherein areal ratios of an α+γ
phase and a γ phase are 3 to 30%, an average crystal grain size
of an α phase is 15 µm or smaller, an average crystal grain size
(a short axis) of the γ phase is 8 µm or smaller, an Sn
concentration in the γ phase is 8 wt% or higher, and the γ phase
is distributed in the grain boundary of the α phase; and
- (3) a crystal structure wherein areal ratios of an α+β+γ
phase and an α phase are 40 to 94%, areal ratios of a β phase
and an α phase are 3 to 30% respectively, average crystal grain
sizes of an α phase and a β phase are 15 µm or smaller, an average
crystal grain size (a short axis) of the γ phase is 8 µm or smaller,
an Sn concentration in the γ phase is 8 wt% or higher and the
γ phase surrounds the β phase.
-
-
According to crystal structures of above-mentioned
(1) ∼ (3), as a first characteristic feature, when a
dezincification test according to Japan Brass Makers
Association Technical Standard JBMA T-303 is carried out, the
corrosion resistance, which the maximum dezinking depth is 100
µm or smaller when the working direction is parallel to it, and
it is 70 µm or smaller when the working direction is
perpendicular to it, can be satisfied.
-
As a second characteristic feature, it has an SCC (Stress
Corrosion Cracking) resistance that, when a cylindrical sample
is exposed to an ammoniacal atmosphere above a 14% aqueous
ammonia solution under applying thereto a load of a 180 N/mm2
for 24 hours, the sample is not broken.
-
As a third characteristic feature, it has a 0.2% proof
stress or a yield stress of 300 N/mm2 or higher.
-
As a fourth characteristic feature, it has anti-erosion
corrosive resistance.
-
To obtain the crystal structure as mentioned above, for
example, a brass material having a composition of an apparent
Zn content of 37 to 50% by weight and an Sn content of 1.7 to
2.2% by weight may be used.
-
Here, the term "an apparent Zn content" is used in the
meaning of "{(B+t·Q)/(A+B+t·Q)}×100" wherein A is a Cu content
(% by weight), B is a Zn content (% by weight), t is a Zn
equivalent of the added third element (e.g., Sn), and Q is a
content of the third element (% by weight).
-
The brass material of the above-mentioned composition
preferably has a γ phase having an average crystal grain diameter
of the short axis of 15 µm or smaller in the crystal structure
of the forging material during forging. According to such a
crystal structure during working, even when it is subjected to
plastic deformation while recrystallization is caused at a low
temperature region of 300 to 550°C, sufficient ductility of the
forging material can be ensured.
-
By making the difference of the temperatures at the
starting of the forging and the finishing of the forging within
20°, at the starting of the working and the finishing of the
working the ductility of the raw material can be made
substantially constant and formability of the forging material
is improved.
-
It is also preferred for improving formability that the
temperature difference between the forging raw material and the
punch or the die is made within 20° or the punch or the die is
heated to 300 to 550°C. To carry out the temperature control
of the punch or the die like this, for example, a heater and
a temperature sensor are provided in the punch or the die and
an amount of heat of the heater can be controlled by a temperature
controller based on the detected signal output from the
temperature sensor.
-
Next, the second example is explained.
-
Fig. 11 is a sectional view showing the structure of a
flange formed by the die forging method according to the second
example of the present invention.
-
Fig. 12 is a sectional view showing a semi-finished forged
product of the flange of Fig. 11.
-
The flange 50 in this example has a short tubular shape,
and has a flange part 51 to be fixed at predetermined attaching
surfaces and a stepped part 52. For forming the flange 50, a
semi-finished forged product 50B is firstly forged. The
semi-finished forged product 50B has a bottom part 53, a flange
starting part 54 having an edge 54a, and a step starting part
55. The lower part 53 and the edge 54a of the flange original
part 54 are removed by machining, etc. to obtain the flange of
Fig. 11.
-
Fig. 13 to Fig. 17 are sectional views schematically
showing an apparatus and forging steps for forging the
semi-finished forged product of the flange of Fig. 12.
-
This brass material forging machine has an lower die set
and a upper die set corresponding to the lower die set. The
lower die set has a lower die 12 and an ejector pin 15 which
slides in a pin inserting hole of the lower die 12 up and down.
The upper die set has an upper die 19, and an upper punch 24
which slides in a punch inserting hole of the upper die 19 up
and down by the cylinder. The lower die 12 is fixed and the
upper die 19 moves up and down between a die-opening state and
a die-clamping state.
-
At the upper surface of the lower die 12, a step forming
hole 12a is provided. This step forming hole 12a is to form
the stepped starting part 55 and the flange starting part 54
of the semi-finished forged product 50B. A part 12b surrounded
by the step forming hole 12a is positioned at higher than the
other upper surface of the lower die 12. A part 24a of the lower
surface of the upper punch 24, which faces to the above-mentioned
step forming hole 12a, is provided to be a recessed
shape. At the state of die-clamping, the recessed part 24a of
the upper punch 24 is connected to the step forming hole 12a
of the lower die 12.
-
Next, the forging step is explained.
-
First, as shown in Fig. 13, at the die-opening state, a
heated forging material 50A is set on a part 12b surrounded by
the step forming hole 12a of the lower die 12. At this time,
the upper punch 24 is positioned at the back of the lower surface
of the upper die 19.
-
Next, as shown in Fig. 14, the upper die 19 and the punch
24 are simultaneously went down, and the lower surface of the
upper die 19 and the upper surface of the lower die 12 are
contacted to each other and die-clamped. During this time, the
ejector pin 15 is retained at a predetermined position (the
upper surface thereof is positioned at the same plane as the
surface of the lower die 12). The forged raw material 50A is
fluidized and deformed, and a part of the starting part 53' of
the bottom part 53 of the semi-finished forged product 50B, a
part of starting part 54' of the flange starting part 54 and
a part of the starting part 55' of the stepped starting part
55 are formed.
-
Next, following to the above, as shown in Fig. 15, only
the upper punch 24 is further went down to make a space made
by the lower die 12, the upper die 19 and the upper punch 24
in order to have the volume substantially equaled to the volume
of the forging raw material 50A. In this step, the forging raw
material 50A is filled in the each part so that a semi-finished
forged product 50B having the lower part 53, the flange starting
part 54 and the stepped starting part 55 are formed.
-
After finishing of the forging forming, as shown in Fig.
16, the upper die set is returned to the upper limit position.
Subsequently, as shown in Fig. 17, the ejector pin 15 is risen
to remove the semi-finished forged product 50B. Finally, the
bottom part 53 and the edge 54a of the flange starting part 54
are removed from the semi-finished forged product 50B by
machining, etc., to obtain a final flange50.
-
According to the die forging method of this example, a
hole which becomes the bottom part 53 and the step starting part
55 are formed by the punch 24 and the flange starting part 54
around the hole is continuously formed by the punch 24 so that
feeding of a raw material from the center portion to the
surroundings becomes smooth whereby formability is improved.
-
Next, the third example is explained.
-
Fig. 18 is a drawing showing the structure of a shuttlecock
wheel according to the third example of the present invention,
and Fig. 18(A) is a plane view and Fig. 18(B) is a sectional
view.
-
Fig. 19 is a drawing showing the structure of the
semi-finished forged product of the shuttlecock wheel of Fig.
18, and Fig. 19(A) is a plane view and Fig. 19(B) is a sectional
view.
-
The shuttlecock wheel of 60 of this example has a hub part
61 and a blade part 62, and an axis hole 63 is penetrated at
the center portion. For forming the shuttlecock wheel 60, an
semi-finished forged product 60B is firstly forged. The
semi-finished forged product 60B has an outer flash part 62a,
an edge surface flash part 63a, a raw material placing step part
62b and a punch step part 62c. By removing the outer flash part
62a, the edge surface flash part 63a, the raw material placing
step part 62b and the punch step part 62c of the semi-finished
forged product 60B by machining, etc., to obtain the shuttlecock
wheel of Fig. 18.
-
Fig. 20 to Fig. 26 are sectional views schematically
showing an apparatus and forging steps for forging the
semi-finished forged product of the shuttlecock wheel of Fig.
19.
-
This brass material forging machine has a lower die set
and a upper die set corresponding to the lower die set. The
lower die set has a lower die 12 and an ejector pin 15 which
slides in a pin inserting hole of the lower die 12 up and down.
The upper die set has an upper die 19 provided with an upper
outer punch 20 and an upper inner punch 21. The upper outer
punch 20 is not connected to a driving source and slidably
provided in a punch inserting hole of the upper die 19 up and
down. Descending of the upper outer punch 20 is stopped by a
stopping surface 19b of the upper die 19. The upper inner punch
21 slides in a punch inserting hole of the upper outer punch
20 up and down. Descending of the upper inner punch 21 is
stopped by a stopping surface 20a of the upper outer punch 20.
-
At the upper surface of the lower die 12, a step forming
hole 12a is provided. This step forming hole 12a is to form
the outer flash part 62a, the raw material placing step part
62b, the punch step part 62c, and the edge surface flash part
63a of the semi-finished forged product 60B. At the part of
the lower surface of the upper die 19, which faces to the
above-mentioned step forming hole 12a, a step forming hole 19a
is formed. At the state of die-clamping, these step forming
holes 12a and 19a are connected to each other.
-
Next, the forging step is explained.
-
First, as shown in Fig. 20, at the die-opening state, a
heated forging material 60A is set on the step forming hole 12a
of the lower die 12. Next, as shown in Fig. 21, the upper die
19 and the upper inner punch 21 are simultaneously gone down,
and the lower surface of the upper die 19 is contacted to the
upper surface of the lower die 12 and clamped. At this time,
the lower surface of the upper outer punch 20 is contacted to
the upper surface of the forging material 60A and stopped.
Since no load is applied to the upper outer punch 20, the punch
20 is relatively moved back to the upper die 19.
-
Next, as shown in Fig. 22, the upper inner punch 21 is
went down until contacting with the stopping surface 20a of the
upper outer punch 20. Here, part of an edge surface flash part
63a of the axis hole 63 is formed. At this time, the upper outer
punch 20 still contacts with the forging material 3A.
-
Next, as shown in Fig. 23, the upper inner punch 21 is
further gone down. At this time, the upper inner punch 21 is
stopped to the stopping surface 20a of the upper outer punch
20, and the upper outer punch 20 and the upper inner punch 21
are simultaneously gone down so that the upper outer punch 20
is contacted to the stopping surface 19b of the upper die 19.
At this time, the axis hole 63 is formed. Simultaneously the
forging material is fluidized and deformed, and filled in a step
forming hole whereby an outer flash part 62a is formed by a
material pushed out to outer peripheral and an edge surface
flash part 63a is completely formed. With the steps that the
axis hole 63 is completely formed by driving into the upper inner
punch 21 and a hub part 61 is formed by compressing with the
upper outer punch 20, simultaneously, the material is spread
out from the center to the peripheral direction whereby the
spreading of the raw material becomes uniform and forming
property is improved.
-
After finishing of the forging forming, as shown in Fig.
24, the upper inner punch 21 is drawn out from the forged product.
Thereafter, as shown in Fig. 25, the upper die set is returned
to the upper limit position. At this time, the upper outer punch
20 is also raised simultaneously. Subsequently, as shown in
Fig. 26, an ejector pin 15 is risen to remove the semi-finished
forged product 60B. Incidentally, part of a part 12c of the
lower die 12 is also raised like as the ejector pin 15 to support
removing of the semi-finished forged product 60B.
-
Thereafter, the outer flash part 62a, the edge surface
flash part 63a, the raw material placing step part 62b and the
punch step part 62c are removed by machining, etc., to obtain
an shuttlecock wheel 60 as a final product.
-
In the die forging method of the third example, while the
upper inner punch 21 (the first punch) is driven into the forging
material 60A, the forging material is worked by the upper outer
punch 20 (the second punch or die) without moving the upper inner
punch 21 (the first punch) back. Thus, there is a merit that
a shape deformation dose not occur at the formed part by the
upper inner punch 21 (the first punch).
-
Next, the fourth example is explained.
-
Fig. 27 to Fig. 33 are sectional views schematically
showing an apparatus and forging steps of the another example
for forging the semi-finished forged product of the shuttlecock
wheel of Fig. 19.
-
This brass material forging machine has an lower die set
and a upper die set corresponding to the lower die set. The
lower die set has a lower die 12 and an ejector pin 15 which
slides in a pin inserting hole of the lower die 12 up and down.
The upper die set has an upper die 19 provided with an upper
outer punch 20 and an upper inner punch 21. The upper outer
punch 20 is not connected to a driving source and slidably
provided in a punch inserting hole of the upper die 19 up and
down. Descending of the upper outer punch 20 is stopped by a
lower stopping surface 19a of the upper die 19 and rising thereof
is stopped by an upper stopping surface 19b of the upper die
19. The upper inner punch 21 slides in a punch inserting hole
of the upper outer punch 20 up and down. Descending of the upper
inner punch 21 is stopped by a stopping surface 20a of the upper
outer punch 20.
-
At the upper surface of the lower die 12, a step forming
hole 12a is provided. This step forming hole 12a is to form
the outer flash part 62a, the raw material placing step part
62b, the punch step part 62c, and the edge surface flash part
63a of the semi-finished forged product 60B. At the part of
the lower surface of the upper die 19, which faces to the
above-mentioned step forming hole 12a, the step forming hole
19a is formed. At the state of clamping, these step forming
holes 12a and 19a are connected to each other.
-
Next, the forging step is explained.
-
First, as shown in Fig. 27, at the die opening state, a
heated forging material 60A is set on the step forming hole 12a
of the lower die 12. The upper outer punch 20 is positioned
on the lower stopping surface 19a of the upper die 19. Next,
as shown in Fig. 28, the upper die 19 and the upper inner punch
21 are simultaneously went down, and the lower surface of the
upper die 19 is contacted to the upper surface of the lower die
12. At this time, however, die-clamping is not carried out.
The lower surface of the upper outer punch 20 is contacted to
the upper surface of the forging material 60A and stopped. The
punch 20 is moved back to the upper stopping surface 19b of the
upper die 19 relative to the upper die 19. The forging material
60A is pressed by the upper inner punch 20 and upper die 19 to
fluidize and deform, and a part 62' of the shuttlecock wheel
is started to forming by the pushed out part to the outer
peripheral direction. An edge surface flash part 63a is
simultaneously started to being formed.
-
Next, as shown in Fig. 29, the upper inner punch 21 is
gone down until contacting with the stopping surface 20a of the
upper outer punch 20. Here, a part of the edge surface flash
part 63a of the axis hole 63 is formed. The Part 62' of the
shuttlecock wheel part is simultaneously further formed. At
this time, the upper outer punch 20 is moved back due to the
movement of the material pushed out by the upper inner punch
21 and the upper die set which dose not die-clamped is also moved
back.
-
Next, as shown in Fig. 30, the upper inner punch 21 is
further gone down. At this time, since the upper inner punch
21 is stopped to the stopping surface 20a of the upper outer
punch 20, the upper outer punch 20 and the upper inner punch
21 are simultaneously gone down. Moreover, the upper die 19
is also gone down to die-clamp. At this time, the axis hole
63 is formed. Simultaneously the forging material is fluidized
and deformed, and filled in a step forming hole whereby an blade
part 62 is completely formed by a material pushed out to outer
peripheral and an edge surface flash part 63a is completely
formed. Also, the upper inner punch 21 is driven into to form
an axis hole 63 completely. With the step that a hub part 61
is formed by compressing with the upper outer punch 20,
simultaneously, the material is spread out from the center to
the peripheral direction whereby a spreading of the raw material
becomes uniform and forming property is improved. Also, in
these steps, the upper inner punch 21 is kept inserted into to
ensure forming of the axis hole 63.
-
After finishing of the forging forming, as shown in Fig.
31, the upper inner punch 21 is drawn out from the forged product.
Thereafter, as shown in Fig. 32, the upper die set is returned
to the upper limit position. At this time, the upper outer punch
20 is also raised. Subsequently, as shown in Fig. 33, an eject
pin 15 is risen to remove the semi-finished forged product 60B.
Incidentally, a part 12c of the lower die 12 is also raised like
as the ejector pin 15 to remove the semi-finished forged product
60B.
-
Thereafter, the outer flash part 62a, the edge surface
flash part 63a, the raw material placing step part 62b and the
punch step part 62c are removed by machining, etc., to obtain
an shuttlecock wheel 60 as a final product.
-
In the die forging method of the fourth example, while
the upper inner punch 21 (the first punch) is driven into the
forging material, the forging material is worked by the upper
outer punch 20 (the second punch or die) without moving the upper
inner punch 21 (the first punch) back. Thus, there is a merit
that a shape deformation dose not occur at the formed part by
the upper inner punch 21 (the first punch).
-
Next, the fifth example is explained.
-
Fig. 34 to Fig. 37 are sectional views schematically
showing an apparatus and forging steps of the another example
for forging the semi-finished forged product of the shuttlecock
wheel of Fig. 19.
-
This brass material forging machine has an lower die set
and a upper die set corresponding to the lower die set. The
lower die set has a lower die 12, a die pin 13 which slides in
a punch inserting hole of the lower die 12 up and down, and an
ejector pin 15 which slides in a pin inserting hole of the lower
die 12 up and down. The upper die set has an upper die 19 and
an upper punch 24 which slides a punch inserting hole of the
upper die 19 up and down. Descending of the upper punch 24 is
stopped by a lower stopping surface 19b of the upper die 19.
-
At the upper surface of the lower die 12, a step forming
hole 12a is formed. This step forming hole 12a is to form the
outer flash part 62a, the raw material placing step part 62b,
the punch step part 62c, and the edge surface flash part 63a
of the semi-finished forged product 60B. At the part of the
lower surface of the upper die 19, which faces to the
above-mentioned step forming hole 12a, a step forming hole 19a
is also formed. At the state of die-clamping, these step
forming holes 12a and 19a are connected to each other.
-
Next, the forging step is explained.
-
First, as shown in Fig. 34, at the die opening state, a
heated forging material 60A is set on the step forming hole 12a
of the lower die 12. At this time, the upper surface of the
die pin 13 is positioned on the same plane as the surface of
the step forming hole 12a and is set at a lower retaining force.
Next, as shown in Fig. 35, the upper die 19 and the upper punch
24 are simultaneously went down, and the lower surface of the
upper die 19 is contacted to the upper surface of the lower die
12 and die-clamped. At this time, the forging material is
fluidized and deformed to fill the each forming holes to form
an blade part 62 completely. Simultaneously, since the die pin
13 is set to a lower retaining force (back pressure), the forging
material 60A is pushed into whereby the die pin 13 is moved back
slightly. Here, an edge surface flash part 63a is partially
formed.
-
Next, as shown in Fig. 36, the upper punch 24 is went down
until contacting with the stopping surface 19a of the upper die
19. Simultaneously, the die pin 13 is moved back. Here, an
axis hole 63 is completely formed. After forming the blade part
62 completely, by forming the axis hole 63 by the upper punch
24, an outer shape of the blade part 62 can be accurately formed.
-
After finishing of this forging, as shown in Fig. 37, the
upper punch 24 is drawn out from the forged product. Thereafter,
the upper die set is returned to the upper limit position.
Subsequently, the ejector pin 15 is raised to remove the
semi-finished forged product 60B.
-
Thereafter, the outer flash part 62a, the edge surface
flash part 63a, the raw material placing step part 62b and the
punch step part 62c are removed by machining, etc., to obtain
an shuttlecock wheel 60 as a final product.
-
In the die forging method of the fifth example, the forging
material 60A is forged by pressurizing using the upper die 19
(a die for die forging an outer shape of the formed product)
and the upper punch 24 (a punch for forming the recessed portion
of the formed product) in combination from the same direction,
and the die pin 13 is moved back under applying a back pressure
during forging. Thus, a product having a complicated shape,
such as an shuttlecock wheel, can be formed.
-
Furthermore, in this embodiment, forming is carried out
by using the upper die 19 (die) and the upper punch 24 (punch)
at different timings. When the die and the punch (or a plural
number of punch) are operated simultaneously, there is a fear
of causing a defect such as defect unfilled material with in
the forging die near the base part of the upper punch 24 during
the forging, etc. However, if the two are used at different
timings, or forming is carried out using a plural number of
punches at different timings, such defect can be prevented.
-
Next, the sixth example is explained.
-
Fig. 38 is a drawing showing the structure of a water meter
formed by the die forging method according to the sixth example
of the present invention, and Fig. 38(A) is a front sectional
view and Fig. 38(B) is a partial sectional plane view.
-
Fig. 39 is a drawing showing the structure of the
semi-finished forged product of the water meter of Fig. 38, and
Fig. 39(A) is a front sectional view and Fig. 39(B) is a partial
sectional plane view.
-
The water meter 70 of this example has a blade inserting
part 71, which a rotating blade( not shown in the drawing)is
attached at the center thereof, and a lid screw part 72. Also,
it has a running water outlet passage 74 extending from an
inserting part 71 to the right lower direction and a running
water inlet passage 73 extending to the left lower direction.
At the tip parts of the running water outlet passage 74 and the
running water inlet passage 73, an outlet screw part 74a and
an inlet screw part 73a are provided. The semi-finished forged
product 70B has, as shown in Fig. 44, flash parts 74b and 73b
at the tips of the outlet screw part 74a and the inlet screw
part 73a, respectively. Also, at where the each running water
passages are getting in the inserting part 71, flash parts 74c
and 73c are provided. These flash parts 74b, 73b, 74c and 73c
are removed to obtain a finished product of the water meter 70.
-
Fig. 40 to Fig. 48 are sectional views schematically
showing an apparatus and forging steps for forging the
semi-finished forged product of the water meter of Fig. 39.
-
Fig. 40 is a side sectional view of the forging machine,
Fig. 41 is a plan view and Fig. 42 is a side sectional view of
the A-A sectional surface.
-
This brass material forging machine has an lower die set
and a upper die set corresponding to the lower die set. The
lower die set has a lower die 12, left and right side punches
226 and 227, a center punch 228, and an ejector pin 15 which
slides in a pin inserting hole of the lower die 12 up and down.
The left and right side punches 226 and 227 slide, as shown in
Fig. 45, in the punch inserting holes provided at the right and
left sides of the lower die 19. The center punch 228 slides,
as shown in Fig. 41, in a punch inserting hole provided at the
front surface of the lower die 19. The left and right punches
inserting holes, are as shown in Fig. 41, positioned along a
straight line in the horizontal sectional plane, and the center
punch hole and the left and right punches inserting holes are
positioned perpendicular on the horizontal sectional surface.
Also, the left punch inserting hole and the right punch
inserting hole are inclined to the outer downward direction.
-
At the upper surface of the lower die 12, a step forming
hole 12a is formed. At the part of the lower surface of the
upper die 19, which faces to the above-mentioned step forming
hole 12a, a step forming hole 19a is formed. At the state of
die-clamping, these step forming holes 12a and 19a are connected
to each other.
-
At the upper die 19, a heater (not shown in the drawing)
is built-in. Also, as shown in Fig. 42, heat-insulating
materials are wound around the outer peripheral of the lower
die 12 and the upper die 19. The die clamping surfaces of the
each dies are covered by the heat-insulating material 229 and
a stainless steel plate 230 to keep the temperature.
-
Next, the forging step is explained.
-
First, as shown in Fig. 43, at the die-opening state, a
heated forging material 70A is set on the step forming hole 12a
on the lower die 12. Next, as shown in Fig. 44, the upper die
19 is went down, and is contacted to the lower die 12 and
die-clamped. Next, as shown in Fig. 45, the center punch 228
is driven into. At this time, the forging material 70A is
fluidized and deformed, and the blade inserting part 71, the
lid screw part 72 and a part of the each running water passages
74' and 73' are formed. After finishing of insertion, a
retaining force is still applied to the middle punch 228.
Subsequently, as shown in Fig. 46, the left side punch 226 and
the right side punch 227 are simultaneously inserted until the
stopping surface. Here, the screw parts 74b and 73b of the
respective running water flow passages and the flash parts 74c
and 73c are formed.
-
After finishing of the forging, as shown in Fig. 47, the
center punch 228, the left side punch 226 and the right side
punch 227 are moved back. Thereafter, as shown in Fig. 48, the
upper die set is returned to the upper limit position. Then,
the ejector pin 15 is raised to remove the semi-finished forged
product 70B. The semi-finished formed product is worked by the
above-mentioned machining, etc., to remove unnecessary parts
to obtain a final formed product.
-
In the die forging method of the sixth example, it
comprises a pushing out step by forming a pushed out part by
forging, and a forming step of forming the pushed out part to
a predetermined shape by further forging, and the above-mentioned
both steps are carried out in the identical die.
-
Thus, forging is carried out in the forming step by the
left and right side punches 226 and 227 (punches, et al.) to
the pushed out part pushed out by the pushing out step so that
a filling property of the material is better than the case that
forming is carried out by pushing out only. Also, the pushing
out step and the forging step are carried out in an identical
die so that kind of dies required decreases and the cost of the
dies is less. Moreover, it is not necessary to transfer the
forging material to the other press during forging so that its
productivity is high.
-
This final formed product has a SCC resistance.
-
Fig. 49 is a drawing showing a SCC resistance test
equipment.
-
The SCC resistance is a characteristic in which a sample
is not cracked when it is exposed to an ammonia atmosphere on
14% aqueous ammonia while applying a load of a stress 180 N/mm2
to the sample. Evaluation of this SCC test is carried out by
exposing a sample to a NH3 vapor atmosphere for 24 hours in a
glass desiccator 231 while applying a load vertically to a
cylindrical shaped sample 232, and then occurrence of cracks
is examined.
-
Also, it has an erosion corrosive resistance.
-
Fig. 50 is a drawing showing a erosion resistance test
equipment.
-
The erosion resistance can be measured by using a
cylindrical shaped sample 53 having an orifice 233 at the inside
thereof, flowing water in the orifice 233 with a flow rate of
40 m/sec for a predetermined time, and then, measuring a
clamping torque to a resin stopper 234 required for sealing the
orifice under a water pressure of 4.9x105 Pa (Kg/cm2).
-
Fig. 51 is a graph showing erosion resistance test
results.
-
As a result, as shown in Fig. 51, good characteristics
than the conventional brass material can be obtained.
-
Next, the seventh example is explained.
-
Fig. 52 is a drawing showing the structure of a lightening
shaft formed by the die forging method according to the seventh
example of the present invention, and Fig. 52(A) is a
perspective view and Fig. 52(B) is a sectional view.
-
Fig. 53 is a drawing showing the structure of the
semi-finished forged product of the lightening shaft of Fig.
52, and Fig. 53(A) is a perspective view and Fig. 53(B) is a
sectional view.
-
The semi-finished forged product 80 of this example has
an axis part 81, an upper small diameter part 82, a large diameter
part 83, and a lower small diameter part 84. In the semi-finished
forged product 80B, a lightening margin 80a is
projected from the lower small diameter part 84. This
lightening margin 80a is removed by machining, etc., to obtain
a final semi-finished forged product 80.
-
Fig. 54 to Fig. 56 are sectional view schematically
showing an apparatus and forging steps for forging the
semi-finished forged product of the lightening shaft of Fig.
53.
-
This brass material forging machine has an lower die set
and a upper die set corresponding to the lower die set. The
lower die set has a lower die 12, a die pin 13 which slides in
a pin inserting hole of the lower die 12 up and down. The upper
die set has an upper die 19, and an upper punch 20 is integrally
provided.
-
At the upper surface of the lower die 12, a step forming
hole 12a is provided. The upper outer punch 20 is inserted to
this step forming hole 12a. At the lower surface of the upper
outer punch 20, a step forming hole 20b is formed.
-
Next, the forging step is explained.
-
First, as shown in Fig. 54, at the die opening state, a
heated forging material 80A is set on the step forming hole 12a
on the lower die 12. Next, as shown in Fig. 55, the upper die
19 is went down, and the lower surface of the upper outer punch
20 is contacted to the upper surface of the forging material
80A. At this time, the lower surface of the upper die 19 is
not contacted to the upper surface of the lower die 12. A
retaining force is applied to the die pin 13. Under this state,
the upper outer punch 20 is subjected the forging material 13
to fluidization and deformation to form parts of the axis part
81, the upper small diameter part 82, the large diameter part
83, and the lower small diameter part 84.
-
Also, as shown in Fig. 56, the upper die 19 is went down,
and the lower surface of the upper die 19 and the upper surface
of the lower die 12 are contacted to each other and die-clamped.
At this time, if a load to be applied to the die pin 13 due to
pressing of the forging material becomes larger than the
retaining force of the die pin 13, an excessive forging material
3A moves the die pin 13 back against the retaining force of the
die pin 13. At this time, the excessive forging material 80A
is flown into the pin inserting hole of the lower die 12 to form
the lightening margin 80a. Also, it is flown into the axis part
81 to form the axis part 81 completely. Finally, the upper die
19 is raised and the die pin 13 is raised to remove the formed
product.
-
During this forming, to the die pin 13, a retaining force,
which is larger than the load applied to the die pin 13 when
the forging material 80A is filled in the forming hole, is
applied. Thus, the forging material 80A is surely filled into
a fine portion of the forming hole and an excessive raw material
is flown into the pin inserting hole so that defect unfilled
material with in the forging die dose not occur. Also, the
material of the moved back part is completely removed in the
later step so that the excessive raw material does not cause
any bad effect to accuracy. Also, the retaining force of the
die pin 13 can be adjustable by a hydraulic cylinder so that
the load applied to the die pin 13 when the forging material
80A is filled in the forming hole can be easily known.
Accordingly, forging can be carried out with the minimum forming
force.
-
Also, when it becomes fully filled state during the
forging, the retaining force of the die pin 13 is so set as to
relatively low, whereby the excessive forging material 80A is
contacted to the die pin 13 and moves the die pin 13 back against
the retaining force of the die pin 13. And it is flowing into
the pin inserting hole while moving the die pin 13 so that a
interruption of the forging caused by the high pressure closed
state dose not occur and a load applied to the die can be reduced.
-
Next, the eighth example is explained.
-
Fig. 57 is a drawing showing the structure of a lightening
shaft formed by the die forging method according to the eighth
example of the present invention, and Fig. 57(A) is a
perspective view and Fig. 57(B) is a sectional view.
-
Fig. 58 is a drawing showing the structure of the
semi-finished forged product of the lightening shaft of Fig.
57, and Fig. 58(A) is a perspective view and Fig. 58(B) is a
sectional view.
-
The semi-finished forged product 90 had a edge part 91,
a hole part 92 and an axis part 93. In the semi-finished forged
product 90B, a lightening margin 90a is projected from the axis
part 93. This lightening margin 90a is removed by machining,
etc., to obtain a final lightening axis 90.
-
Fig. 59 to Fig. 62 are sectional views schematically
showing an apparatus and forging steps for forging the
semi-finished forged product of the lightening shaft of Fig.
58.
-
This brass material forging machine has an lower die set
and a upper die set corresponding to the lower die set. The
lower die set has a lower die 12, a die pin 13 which slides in
a pin inserting hole of the lower die 12 up and down. The upper
die set has an upper die 19 and a punch 24 which slides in the
punch inserting hole up and down.
-
At the upper surface of the lower die 12, a step forming
hole 12a is provided. At a part of the lower surface of the
upper die 19, which faces to the above-mentioned step forming
hole 12a, a step forming hole 19a is formed. At the state of
die-clamped, these step forming holes 19a and 12a are connected
to each other.
-
Next, the forging step is explained.
-
First, as shown in Fig. 59, at the die opening state, a
heated forging material 90A is set in the step forming hole 12a
of the lower die 12. At this time, the upper surface of the
die pin 13 is positioned at the same plane as the surface of
the step forming hole 12a. Next, as shown in Fig. 60, the upper
die 19 and the upper punch 24 are simultaneously went down, and
the lower surface of the upper die 19 is contacted to the upper
surface of the lower die 12, and die-clamped.
-
Next, as shown in Fig. 61, the upper punch 24 is went down
to a first level. At this time, the forging material is
fluidized and deformed, and a part of the edge part 91, the hole
part 92 and the axis part 93 are formed. Here, a load applied
to the die pin 13 due to pressing of the forging material is
equaled to the retaining force of the die pin 13 whereby the
die pin 13 is not moved back. Next, as shown in Fig. 62, the
upper punch 24 is went down to a second level. At this time,
the load applied to the die pin 13 becomes larger than the
retaining force, and the excessive forging material 90A moves
the die pin 13 back against the retaining force of the die pin
13. Here, the edge part 91 is completely formed, and the
excessive forging material 90A is flown into the pin inserting
hole whereby a lightening margin 90a is formed.
-
Finally, the upper die set is returned to the upper limit
position to remove the semi-finished forged product.
Thereafter, the lightening margin 90a is removed by machining,
etc., to obtain the final lightening shaft 90.
-
Next, the ninth example is explained.
-
Fig. 63 is a drawing showing the structure of a hand shower
supporting fitment formed by the die forging method according
to the ninth example of the present invention, and Fig. 63(A)
is a plane sectional view and Fig. 63(B) is a side surface
sectional view.
-
The hand shower supporting fitment 100 of this example
has a closed bottom cylindrical shape, and has two recessed
parts of a deep recessed part (the first recessed part) 101 to
insert the hand shower and a shallow recessed part (the second
recessed part) 102 having larger diameter than the above. At
the opened tip part, a pushed out part 103 which is pushed out
to outer peripheral is provided, and at the closed bottom part,
a small projection 104 is provided.
-
Fig. 64 to Fig. 69 are sectional views schematically
showing an apparatus and forging steps for forging the hand
shower supporting fitment of Fig. 63.
-
This brass material forging machine has an lower die set
and a upper set corresponding to the lower die set. The lower
die set has a lower die 12, and a die pin 13 which slides in
a pin inserting hole of the lower die 12 up and down. The upper
die set has an upper die 19, an upper outer punch 20 and an upper
inner punch 21. The upper outer punch 20 slides between the
lower stopping surface 19b and the upper stopping surface 19c
of the upper die 19 up and down. Further, the upper outer punch
20 is biased upward by a spring 20c. The upper inner punch
21 slides in the punch inserting hole of the upper outer punch
20 up and down.
-
At the upper surface of the die pin 13, a recessed part
13a is provided. This recessed part 13a is to form a projection
104 of the hand shower supporting fitment 100. At the lower
surface of the upper die 19, a step forming hole 19a is provided.
-
Next, the forging step is explained.
-
First, as shown in Fig. 64, at the die opening state, a
heated forging material 100A is set on the die pin 13 in the
lower die 12. At this time, the lower surface of the upper outer
punch 20 biased upward is positioned at the same plane as the
lower surface of the upper die 19. Next, as shown Fig.65, the
upper die 19 and the upper inner punch 21 are gone down
simultaneously, the lower surface of the upper die 19 is
contacted to the upper surface of the lower die 12 and die clamped.
Next, as shown in Fig. 66, the die pin 13 is raised. At this
time, the upper inner punch 21 is supported to locate at the
position as shown in Fig. 65. The forging material 100A is
fluidized and deformed to form a pushed out part 103 and a
projection 104 is formed at the end surface. Thus, by providing
the recessed part for forming at the die pin 13, forming of a
complicated shape can be carried out.
-
Next, as shown in Fig. 67, the upper inner punch 21 is
gone down. Here, forming of a deep recessed part 101' is started.
At this time, the die pin 13 is moved back downward while applying
a back pressure to the forging material 100A. The die pin 13
goes down until a volume corresponding to the going down part
thereof is equal to the volume corresponding to the forced part
by the upper inner punch 21. Subsequently, as shown in Fig.
68, the upper inner punch further goes down. At this time, the
upper inner punch 21 is contacted to the upper outer punch 20
and the upper outer punch 20 also simultaneously goes down.
Here, a shallow recessed part 102 is formed. The die pin 13
is moved back under applying a back pressure. Thus, by using
two punches having different diameters with two steps, it is
possible to form a recessed part having different depths without
causing inhibition of fluidization of the raw material.
-
Thereafter, as shown in Fig. 69, the upper inner punch
21 is raised. Thereafter, the upper die set is returned to the
upper limit position, and finally the upper die 19 is raised
to remove the formed product.
-
By moving back the die pin 13 under applying a back
pressure thereto, flow back, which an inner part corresponding
to the volume of the recessed part of the forging material 3A
is pressed up to the opposite direction of the upper inner punch
21 and the upper outer punch 2, dose not occur, and the forging
material 100A fluidizes continuously and smoothly. Thus,
small cracks of the product are not generated. Also, a pressing
force of the punch may be made substantially the same as the
working force of the raw material so that buckling of the punch
does not occur and the depth of the recessed part can be freely
set.
-
Next, the tenth example is explained.
-
Fig. 70 is a drawing showing the structure of a flush valve
lid formed by the die forging method according to the tenth
example of the present invention.
-
The flush valve lid 110 of this example has a recessed
shape, and has a cylinder part 111 and a tip part 112. At the
upper surface of the tip part 112, a knob 113 having an undercut
is provided. Also, at the cylinder part 111, a shoulder art
114 is provided.
-
Fig. 71 to Fig. 77 are sectional views schematically
showing an apparatus and forging steps for forging the hand
shower supporting fitment of Fig. 70.
-
This brass material forging machine has an lower die set
and a upper die set corresponding to the lower die set. The
lower die set has a lower die 12, and a lower punch 235 which
slides in a punch inserting hole of the lower die 12 up and down.
At the outer peripheral of the lower punch 235, a color 236 is
attached and biased upward by a spring. The upper die set has
an upper die 19, and an upper punch 24 which slides in the punch
inserting hole of the upper die 19 up and down. At the outer
peripheral of the upper punch 24, a block 237 is provided. This
block 237 comprises two parts 237a and 237b, which are
symmetrical to the axis direction of the upper punch 24 and
biased by a spring to the outer direction perpendicular to the
axis.
-
At the upper surface of the lower die 12, a step forming
hole 12a is provided. The lower surface of the block 237 is
formed in a recessed shape. Also, at the parts thereof, which
face to the divided parts 237a and 237b of the block 237, a
recessed part 237c is provided. This recessed part 237c is to
form the knob 113 of the flush valve lid 110.
-
Next, the forging step is explained.
-
First, as shown in Fig. 71, at the die opening state, a
heated forging material 110A is set on the lower punch 235 of
the lower die 12. The lower end surface of the block 237 is
positioned at lower than the lower surface of the upper die 12.
Next, as shown in Fig. 72, the upper die 19 and the upper punch
24 are simultaneously went down, and the lower surface of the
block 237 is contacted to the upper surface of the lower die
12 and die-clamped. Here, the heated forging material 110A is
fluidized and deformed whereby the tip part 112 and the shoulder
part 114 are formed, and simultaneously a starting part 113'
of the knob 113 is started to forming at the tip part.
-
Next, as shown in Fig. 73, the lower punch 235 is raised.
The forging material 110A is further fluidized and deformed,
and the starting part 113' of the knob 113 further grows upward.
Further, a force stronger than the retaining force of the spring
is applied to the upper part of the color 236 of the lower punch
235 so that the cylinder part 111 is completely formed. At this
time, back pressure is applied to the color 236 by the spring,
and by pressing the lower end of the cylinder part 111, crack
of the forging material can be prevented.
-
Next, as shown in Fig. 74, the upper punch 24 is gone down.
At this time, the starting part of the knob 113 formed at the
tip part 112 is pressed to be pushed out to the side direction,
and the knob (a protruded part) 113 having an undercut is formed.
Thus, by forming the cylinder part 111 and the knob 113 having
an undercut continuously, cracks at the cylinder part 111 and
a defect of fold at or below the surface layer of the undercut
can be prevented and forging defect is hardly caused.
-
Thereafter, as shown in Fig. 75, the lower punch 235 gone
down. And as shown in Fig. 76, the upper die 19, the upper punch
24 and the block 237 are simultaneously raised. The forged
product is hold by the block 237 and raised together. Finally,
as shown in Fig. 77, the upper punch 24 is gone down relative
to the upper die 19. At this time, the block 237 is opened to
left and right by the bias of the spring to release the knob
113 so that the forging finished product 110 is surely removed.
-
In the die forging method according to the tenth example,
it comprises a step B by firstly drawing out the lower punch
235 (punch) used for forming the cylinder part 111 (cylinder
part) when the forging finished product 110 (formed product)
is removed, and a step C by drawing out the formed product from
the block 237 (die) used for forming the outer peripheral
surface of the cylindrical part 111 (cylindrical part) after
the step B. Thus, by decreasing the drawing force of the lower
punch 235 (punch) or the block 237 (die), deformation of the
forging finished product 110 can be prevented and the formed
product can be surely removed.
-
Next, the eleventh example is explained.
-
Fig. 78 is a side surface sectional view showing the
structure of a H bushing formed by the die forging method
according to the eleventh example of the present invention.
-
The H-shaped bushing 120 has an H-shaped sectional
surface and has an upper recessed part 121 and a lower recessed
part 122, and a flange 123 projected to the outer direction on
the outer circumference is formed.
-
Fig. 79 and Fig. 80 are sectional views schematically
showing an apparatus and forging steps for forging the H-shaped
bushing of Fig. 78.
-
This brass material forging machine has an lower die set
and a upper die set corresponding to the lower set. The lower
die set has a lower die 19, a lower inner die pin 238 and a lower
outer die pin 239. The lower outer die pin 239 slides in the
pin inserting hole of the lower die 19 up and down, and the lower
inner die pin 238 slides in the pin inserting hole of the lower
outer die pin 239 up and down. The upper die set has an upper
die 12, and an upper punch 24 which slides in the punch inserting
hole of the upper die 12 up and down. The lower inner die pin
239, the lower outer die pin 239 and the upper punch 24 slide
along the identical axis.
-
At the upper surface of the lower die 19, a step forming
hole 19a is provided. This step forming hole 19a is to form
the flange 123. At the part of the lower surface of the upper
die 12, which faces to the above-mentioned step forming hole
19a, a step forming hole 12a is formed. This step forming hole
12a is to form the upper recessed part 121.
-
Next, the forging step is explained.
-
First, at the die-opening state, a heated forging
material 120A is set on the upper surface of the inner die pin
238 and the outer die pin 239 of the lower die 12. At this time,
the upper surfaces of the each die pins are positioned at the
same plane position. Next, as shown in Fig. 79, the upper die
19 and the upper punch 24 are simultaneously went down, and the
lower surface of the upper die 19 and the upper surface of the
lower die 12 are contacted to each other and die-clamped. At
this time, the forging material 120A is fluidized and deformed
whereby a part 121' of the upper recessed part 121' and the flange
123 are formed.
-
Subsequently, as shown in Fig. 80, the upper punch 24 is
gone down further, and simultaneously, the outer die pin 239
gone down. At this time, the volume corresponding to the going
down part of the upper punch 24 is equaled to the volume
corresponding to the going down part of the outer die pin 239.
The inner die pin 238 is retained under applying a high retaining
pressure thereto. According to this, the lower recessed part
122 is formed. Thus, by the upper punch 24 and the die pins
238 and 239 provided along the identical axis, a complicated
forging having recessed portions on the top and the bottom can
be carried out. Finally, the outer die pin 239 is raised to
remove the forged product.
-
Next, the twelfth example is explained.
-
Fig. 81 is a side surface sectional view showing the
structure of a tee formed by the die forging method according
to the twelfth example of the present invention.
-
The tee 130 has a T-shaped cylindrical sectional surface,
and has passages 131 and 132 opened to left and right, and the
lower passage 133 opened downward perpendicular to the passages.
To produce this tee 130, after forming a semi-finished forging
product 130B (see Fig.86) firstly, the final product is produced
by machining, etc. The semi-finished forging product 3B has
a shape having walls at the center of the left and right passages
131 and 132, and between, the left and right passages 131 and
132, and the lower passage 133.
-
Fig. 82 to Fig. 86 are sectional views showing
schematically an apparatus and forging steps for forging the
semi-finished forged product of the tee of Fig. 81.
-
This brass material forging machine has an lower die set
and a upper die set corresponding to the lower die set. The
lower die set has a lower die 12, and a left side punch 226,
a right side punch 227, a ring 252 and a lower fixed punch 253.
The left and right side punches 226 and 227 slide in the left
and right punch inserting holes of the lower die 12 on the
identical axis. The ring 252 slides on the outer peripheral
of the fixed punch 253 of the lower die 12 up and down. The
sliding direction of the ring 252 is perpendicular to the
sliding direction of the left and right side punches.
-
At the upper surface of the lower die 12, a forming hole
12a is provided. At the lower surface of the upper die 19, a
forming hole 19a is formed. These forming holes are connected
to each other when they are clamped.
-
Next, the forging step is explained.
-
First, at the die opening state, a heated forging material
130A is set on the upper surface of the fixed punch 253 and the
ring 252 of the lower die 12. At this time, the upper surfaces
of the fixed punch 253 and the ring 252 are positioned at the
same plane. Next, as shown in Fig. 82, the upper die 19 is went
down, and the lower surface of the upper die 19 and the upper
surface of the lower die 12 are contacted to each other and
die-clamped. Next, as shown in Fig. 83, the left and right side
punches 226 and 227 are simultaneously driven into until a first
level. At this time, the forging raw material 130A is fluidized
and deformed whereby parts of the left and right passages 131'
and 132' are formed. The ring 252 has been retained.
-
Next, as shown in Fig. 84, the left and right side punches
226 and 227 are driven into until the second level. At this
time, the ring 252 is moved back simultaneously. Here, the
volume corresponding to the driven into right and left punches
is equaled to the volume corresponding to the moved back ring
252. Here, the left and right passages 131 and 132 are further
formed, and the lower passage 133 is formed. Thus, by the left
and right side punches 226 and 227, and the ring 252 which slides
to the direction different from the sliding directions of these
side punches, forging of a complicated shape having openings
to the three different directions can be carried out.
-
Next, as shown in Fig. 85, the left and right side punches
226 and 227 are moved back. Thereafter, as shown in Fig. 86,
the ring 252 is raised and the semi-finished forged product 130B
is removed. Finally, the remaining walls are machined to obtain
a final formed product.
-
In the die forging method according to the twelfth example,
it comprises hole forming step by forming a hole by driving the
left and side punches 226 and 227 (punches) into the forging
material while the ring 252 (die pin) is in touch with one end
surface of the forging material and moving back under applying
a back pressure thereto, the left and right side punches 226
and 227 (punches) are driven into the forging material, and the
above mentioned left and right side punches 226 and 227
(punches) are driven from a direction other than the moving back
direction of the above-mentioned ring 252 (die pin) or the
opposite direction thereof. Thus, since the left and right side
punches 226 and 227 (punches) are driven from the direction
other than the moving back direction of the above-mentioned ring
252 (die pin) or the opposite direction thereof, a product
having a complicated and various shape, such as a tee, can be
formed.
-
Also, according to this embodiment, forming is carried
out by driving the left and right side punches 226 and 227 (a
plural number of punches) from the different direction
simultaneously and by moving the ring 252 (die pin) back under
applying a back pressure thereto during the forging. Thus, a
product having a complicated and various shape can be formed.
-
Next, the thirteenth example is explained.
-
Fig. 87 is a sectional view showing a side surface
sectional view showing the structure of a multi header formed
by the die forging method according to the thirteenth example
of the present invention.
-
The multi header 140 of this example has a passage 141
penetrating along the left to right, and three top and bottom
passages 142 which is arranged perpendicular to the passage and
connected to the passage.
-
Fig. 88 to Fig. 90 are sectional views schematically
showing an apparatus and forging steps for forging the multi
header of Fig. 87.
-
This brass material forging machine has an lower die set
and a upper die set corresponding to the lower die set. The
lower die set has a lower die 12, and a left side punch 226,
a right side punch 227 and a right hollow pin 255. The left
side punch 226 slides in the pin inserting hole of the lower
die 12. The right hollow pin 227 slides in the inserting hole
of the lower die 12. The right side punch 227 slides in the
right hollow pin 255. Further, at the lower die 12, three fixed
punches 253 are provided perpendicular to the above-mentioned
inserting hole, and a lower hollow die pin 252, which slides
the outer peripheral of the fixed punch 253 up and down, is
provided.
-
Next, the forging step is explained.
-
First, at the die opening state, a heated forging material
140A is set at the left, than the most left hollow die pin 252a,
on the lower die 12. At this time, the right side punch 227
and the tip end right hollow pin 255 are at the same surface,
and the both tip ends are positioned at the left of the hollow
die pin 252a. Next, the upper die 19 is gone down, and the lower
surface of the upper die 19 is contacted to the upper surface
of the lower die and die-clamped. Next, as shown in Fig. 88,
the left side punch 226 is driven into the right direction.
Simultaneously, the right hollow pin 255 is moved back until
near of the most left fixed punch 253a is exposed. Further,
the most left lower hollow die pin 252a goes down. At this time,
the forging material is fluidized and deformed to form parts
of the right and left passages and a part of the most left top
and bottom passages are formed.
-
Subsequently, as shown in Fig. 89, when the left side punch
226 is further driving into, the most left lower hollow die pin
252a is gone down to the stopping surface. Here, the first top
and bottom passages are formed. At this time, the right side
punch 227 is not driven. Next, as shown in Fig. 90, the left
side punch 227 is further driven into the right direction.
Simultaneously, the right hollow pin 255 is moved back so that
near of the second fixed punch 253b is exposed. Further, the
lower hollow die pin 252b is gone down. At this time, the first
lower hollow die pin 252a is stopped and not driven. The forging
material is fluidized and deformed whereby parts of the second
top and bottom passages are formed. Also, the left side punch
227 is driven into and the lower hollow die pin 252b is gone
down to the stopping surface to form the second top and bottom
passages. Thus, by providing a plural number of fixed punches
253 at the different axes, forging with a complicated shape can
be carried out.
-
This operation is repeated in the same times as a number
of the top and bottom passages to form a plural number of the
top and bottom passages. Finally the formed product has walls
at end of the right and left passages, and between, the right
and left passages, and, the top and bottom passages.
Accordingly, these walls are machined to obtain a final formed
product.
-
In the die forging method according to the thirteenth
example, it comprises a forging step by driving the left side
punch 227 (punch) into the forging material or by pressing a
die to the forging material while the hollow die pin 252 (die
pin) is in touch with one end surface of the forging material
and moving back under applying a back pressure thereto, and a
plural number of the above-mentioned hollow die pin 252 (die
pin) are provided to form a plural number of deep holes. Thus,
a product having a complicated shape, such as a multiple header
having a number of holes, can be formed.
-
Next, another embodiment of the present invention is
explained.
-
According to the present invention, forging of a water
spouting apparatus having a curved hollow part, etc. can be
effectively carried out.
-
Heretofore, when a water spouting apparatus having a
curved hollow part, etc. is to be produced, a forged product
having an outline shape is produced by using a bronze casting,
etc., and the product is subjected to wide ranges of machining
to make a final product shape. This method is susceptible of
defects such as pinhole, shrinkage, etc., which are specific
to the casting material, and a ratio of non-defect products is
bad. Also, a significant amount of machining is carried out
and a machining time is long so that it is not suitable for mass
production. Moreover, much amount of cutting swarf is
generated whereby a yield of the material is poor.
-
As a means to solve these technical problems, it can be
considered to prepare a formed product having a shape near to
the final product by forging forming, but according to the
conventional forging forming, a complicated shape, such as a
hollow curve part, cannot be formed. However, when the die
forging method of the present invention is applied, a product,
such as a water spouting apparatus having a hollow curve part
which could never be forged by the conventional method, can be
formed with a shape near to the final product shape.
-
According to this embodiment of the present invention,
in a die forging method of a water spouting apparatus, etc.,
having a container room which has an opening for containing a
flow amount or temperature adjusting part, as well as an inlet
and an outlet, and a curved outlet which is to connect the
above-mentioned outlet formed at an inner wall of the
above-mentioned container room and a water spouting port opened
to outside, a method comprising the following steps can be
provided.
- a) a first step by preparing a raw material,
- b) a second step by roughly forming an inner wall of the
above-mentioned container room while forming the above-mentioned
opening by inserting a first punch into the
above-mentioned raw material to form a hollow part,
- c) a third step by roughly forming an inner wall of the
above-mentioned curved outlet by inserting a second punch into
the above-mentioned raw material to form a hollow part, and
- d) a fourth step by forming the above-mentioned outlet by
removing separating walls positioned at the tip sides of the
above-mentioned first and second punches.
-
-
According to this die forging method, occurrence of
defects such as pinhole or shrinkage, etc. can be prevented.
Also, the part which requires to subject to machining is small
so that a working time can be shortened and mass production can
be realized. Moreover, an amount of cutting swarf is little
so that a yield of the material is increased.
-
A die forging method in another embodiment comprises the
following steps.
- a) a first step by preparing a raw material,
- b) a second step by roughly forming an inner wall of the
above-mentioned container while forming the above-mentioned
opening by inserting a first punch into the above-mentioned raw
material to form a hollow part,
- c) a third step by roughly forming an inner wall of the
above-mentioned curved outlet by inserting a second punch into
the above-mentioned raw material to form a hollow part, and
inserting the above-mentioned second punch so that a separating
wall positioned at the tip side of the above-mentioned second
punch is near to the above-mentioned container room side than
the above-mentioned outlet, and,
- d) a fourth step by forming the above-mentioned outlet by
removing a separating wall positioned at the tip sides of the
above-mentioned first and second punches.
-
-
In this method, in the third step, the above-mentioned
second punch can be inserted so that the separating wall
positioned at the tip side of the above-mentioned second punch
locates at the position near to the above-mentioned container
side than the above-mentioned outlet. According to this,
removal of the separating wall becomes easier in the above-mentioned
fourth step.
-
A die forging method in still another embodiment contains
the following steps.
- a) a first step by preparing a raw material,
- b) a second step by roughly forming an inner wall of the
above-mentioned container room while forming the above-mentioned
opening by inserting a first punch into the
above-mentioned raw material to form a hollow part,
- c) a third step by roughly forming an inner wall of the
above-mentioned curved outlet by inserting a second punch into
the above-mentioned raw material to form a hollow part, during
which the above-mentioned first punch is still being inserted
into the above-mentioned raw material, and
- d) a fourth step by forming the above-mentioned outlet by
removing a separating wall positioned at the tip sides of the
above-mentioned first and second punches.
-
-
In this method, in the third step, forming is carried out
while inserting the above-mentioned first punch into the
above-mentioned raw material so that deflection of the material
at the time of inserting the second punch can be reduced so that
a product with high accuracy can be obtained.
-
In the above-mentioned third step, an inner wall of the
above-mentioned curved outlet is roughly formed by inserting
the second punch into the above-mentioned raw material to form
a hollow part, and when the above-mentioned second punch is to
be inserted so that the separating wall positioned at the tip
side of the above-mentioned second punch is near to the
above-mentioned container side than the above-mentioned outlet,
it may be carried out while the above-mentioned first punch is
being inserted into the above-mentioned raw material. In this
case, removal of the separating wall becomes further easier.
-
A die forging method in the still further embodiment
contains the following steps.
- a) a first step by preparing a raw material,
- b) a second step by roughly forming an inner wall of the
above-mentioned container while forming the above-mentioned
opening by inserting a first punch, which has, along with the
inserting direction, a first part having a first sectional shape
and a second part having a second sectional shape in which a
predetermined part of the above-mentioned first sectional shape
being lacked, into the above-mentioned raw material to form a
hollow part,
- c) a third step by roughly forming an inner wall of the
above-mentioned curved outlet by inserting a second punch into
the above-mentioned raw material to form a hollow part, during
which the above-mentioned first punch is being still inserted
into the above-mentioned raw material, and the above-mentioned
second punch is inserted until the tip thereof is reached to
the predetermined part of the above-mentioned first punch, and
- d) a fourth step of forming the above-mentioned outlet by
removing a separating wall positioned at the tip sides of the
above-mentioned first and second punches.
-
-
According to this method, even when it has a shape that
the first punch and the second punch are crossed to each other,
forming can be carried out with good efficiency.
-
In the above-mentioned third step, the inner wall of the
above-mentioned curved outlet is roughly formed by inserting
the second punch into the above-mentioned raw material to form
a hollow part, and at the time when the above-mentioned second
punch is inserted so that the separating wall positioned at the
tip side of the above-mentioned second punch is near to the
above-mentioned container side than the above-mentioned outlet,
it is carried out while inserting the above-mentioned first
punch into the above-mentioned raw material, and the above-mentioned
second punch may be inserted until the tip thereof
is reached to the predetermined part of the above-mentioned
first punch. In this case, removal of the separating wall
becomes further easier.
-
In these forging methods, in the above-mentioned first
step, it has a gap between the outer peripheral of the
above-mentioned raw material and the inner peripheral of the
above-mentioned die, in the above-mentioned second step, part
of the above-mentioned raw material is swelled out to the
above-mentioned gap by insertion of the above-mentioned first
punch, and in the third step, the above-mentioned second punch
may be inserted into the part of the above-mentioned raw
material swelled out to the above-mentioned gap. By forming
a hollow part while swelling out the material, the hollow shape
can be easily formed and reduction of occurrence of defect can
be expected.
-
Or else, the above-mentioned outlet may form a curve along
with the axis direction.
-
Or else, the above-mentioned container room and the
above-mentioned outlet may be formed integrally. In this case,
as compared with the product in which the above-mentioned
container room and the above-mentioned outlet are separately
formed and thereafter these are laminated, dimensional accuracy
of the product is improved and it is seamless so that a polishing
step of the outer shape of the product can be simplified.
-
A water spouting apparatus which is one of the embodiments
of the present invention comprises a water spouting apparatus
having a container which has an opening for containing a flow
amount or temperature adjusting part, as well as an inlet and
an outlet, and a flow passage which is to connect the
above-mentioned outlet formed at an inner wall of the
above-mentioned container room and a water spouting port opened
to outside, wherein it is formed by forging forming.
-
As compared with the product in which the above-mentioned
container room and the above-mentioned outlet are separately
formed and thereafter these are laminated, it has merits that
dimensional accuracy of the product is improved and it is
seamless so that a polishing step of the outer shape of the
product can be simplified.
-
The die forging method of the present invention can be
applied to production of a metal forming product having a first
hole part and a curved shaped second hole part. This die forging
method contains the following steps.
- a) a first step by preparing a metal material,
- b) a second step by inserting a first punch into the above-mentioned
metal material to form a first hole part, and
- c) a third step by inserting a second punch into the above-mentioned
metal material, during which the above-mentioned
first punch is inserted, to form a curved second hole part.
-
-
When the second hole part with a curved shape is formed
by inserting the above-mentioned second punch, it is carried
out while the first punch is still inserted into the above-mentioned
raw material, deflection of the material when the
second punch is inserted can be reduced and a product with a
higher accuracy can be formed.
-
The die forging method in further another embodiment has
the following steps.
- a) a first step by preparing a metal material,
- b) a second step by inserting a first punch, which has, along
with the inserting direction, a first part having a first
sectional shape and a second part having a second sectional
shape in which a predetermined part of the above-mentioned first
sectional shape being lacked, into the above-mentioned metal
material to form a first hole part, and
- c) a third step by inserting a second punch into the above-mentioned
metal material, during which the above-mentioned
first punch is inserted, until the tip thereof is reached to
the predetermined part to form a curved second hole part.
-
-
According to this method, even when it has a shape that
the first punch and the second punch are crossed to each other,
forming can be carried out with good efficiency.
-
In the above-mentioned die forging method, the above-mentioned
second punch has a circular arc shape with a constant
curvature radius along with the axis direction, and the
above-mentioned curved second hole part may be formed by a
circumferential movement with the center of the circular arc
as the center. By using such a method, a product having a
circular arc shaped hollow part at part thereof can be
efficiently produced.
-
According to the die forging method of the present
invention, it can be applied to a production of a metal formed
product having a first hole part and a curved shaped second hole
part, and being formed a connecting port at the inner wall of
the above-mentioned first hole part, the port being connected
to the above-mentioned second hole part. This die forging
method contains the following steps.
- a) a first step by preparing a metal material,
- b) a second step by inserting a first punch into the above-mentioned
metal material to form a first hollow part whereby
roughly forming the above-mentioned first hole part,
- c) a third step by inserting a curved second punch into the
above-mentioned metal material to roughly form a curved second
hollow part whereby roughly forming the above-mentioned second
hole part, and
- d) a fourth step by removing a separating wall positioned at
the tip side of the above-mentioned curved second punch to form
the above-mentioned connecting port.
-
-
In this method, in the above-mentioned third step, it is
preferred to insert the above-mentioned curved second punch so
that the above-mentioned separating wall becomes at the
above-mentioned first hole part side than the above-mentioned
connecting port. According to this arrangement, removal of
the separating wall becomes easier.
-
Further another die forging method has the following
steps.
- a) a first step by placing a metal material in a closed space
surrounded by a die at the state of keeping a gap between an
inner peripheral of the above-mentioned die,
- b) a second step by inserting a first punch into the above-mentioned
metal material to form a first hole part and part of
the above-mentioned raw material is swelled out into the
above-mentioned gap, and
- c) a third step by inserting a curved second punch into the part
of the above-mentioned metal material swelled out into the
above-mentioned gap to form a curved second hole part.
-
-
In a producing apparatus of a metal formed product in an
embodiment of the present invention, a first hole part and a
curved second hole part are formed by driving a first punch and
a curved second punch into a metal material.
-
In a producing apparatus of a metal formed product in
another embodiment of the present invention, a first hole part
and a curved second hole part are formed by inserting a first
punch, which has, along with the inserting direction, a first
part having a first sectional shape and a second part having
a second sectional shape in which a predetermined part of the
above-mentioned first sectional shape being lacked, and a
curved second punch which is so constituted that it is inserted
until the tip of which is reached to the above-mentioned
predetermined part, into a metal material. According to this
apparatus, even when it has a shape that the first punch and
the second punch are crossed to each other, forming can be
carried out with good efficiency.
-
In the above-mentioned apparatus, a pinion is provided
at the above-mentioned curved second punch, and the above-mentioned
second punch preferably slides by sliding of a rod
member to which a rack with the above-mentioned pinion is formed.
Since the punch and the rod member are slid by the rack and the
pinion, sliding of the punch and the rod member can be easily
synchronized. Thus, it can be applied to forming accompanied
by a heavy lord.
-
In the above-mentioned apparatus, a linear moving passage
having the same axis with the above-mentioned rod member which
moves linear may be further provided. According to this,
accuracy of a sliding track for the above-mentioned rod member
is further improved.
-
A producing apparatus of a metal formed product in the
other embodiment of the present invention has a first punch,
a second punch having a circular arc shape with a constant
curvature radius, and a driving means to move the second punch
to circumferential movement with the center of said circular
arc as a center, and the above-mentioned first punch and the
above-mentioned second punch are inserted into a metal material
to form a first hole part and a curved second hole part.
-
A producing apparatus of a metal formed product in the
other embodiment of the present invention has a first punch,
a second punch having a circular arc shape with a constant
curvature radius, a driving means to move the second punch to
circumferential movement with the center of said circular arc
as a center, and a circular arc shape movement passage having
the same axis with the above-mentioned second punch which moves
said circumferential movement, and the above-mentioned first
punch and the above-mentioned second punch are inserted into
a metal material to form a first hole part and a curved second
hole part. By having the circular arc shape movement passage,
accuracy of a sliding track for the above-mentioned circular
arced second punch is further improved.
-
In these apparatuses, a heater may be buried to the
above-mentioned first punch and/or the second punch. By
providing a heater, temperature control of the punches can be
carried out so that setting of forming conditions in accordance
with the material becomes easy.
-
Also, a heater may be buried at the metal die at a part
other than the above-mentioned first punch and the second punch.
By providing a heater, temperature control of the punch can be
carried out so that setting of forming conditions in accordance
with the material becomes easy.
-
Next, as the fourteenth example, a tap apparatus having
a curved hollow part is explained by referring to drawings.
-
Fig. 91 is an assembly drawing showing a tap apparatus
according to the fourteenth example of the present invention.
-
Fig. 92 is a drawing of parts of the tap apparatus of Fig.
1 in which machining has finished, and Fig. 92(A) is a plane
view, Fig. 92(B) is a longitudinal sectional view and Fig. 92(C)
is a side view.
-
This tap apparatus part 300 has a linear through passage
(container) 301 opened to top and bottom, and a curved water
spouting passage (curved outlet passage) 303 provided at the
wall surface of the through hole 301. The through hole 301 and
the water spouting passage 303 are connected to each other.
-
Fig. 93 is a drawing showing an semi-finished forged
product of a part of the tap apparatus of Fig. 92, and Fig. 93 (A)
is a plane view, Fig. 93(B) is a longitudinal sectional view
and Fig. 93(C) is a side view.
-
The semi-finished forging product 300B of this tap
apparatus part 300 has a lower end flash part 301a at part of
the lower end of the through passage 301. Also, it has a
separating wall flash part (separating wall) 303a at the part
into which the wall of the water spouting passage 303 is inserted
in the through passage 301. By removing the lower end flash
part 301a and the separating wall flash part 303a of the
semi-finished forged product by machining, etc., a final tap
apparatus part 300 is obtained. The curved outlet 303 of said
part 300 is formed to a final product shape at forging step.
-
Next, by referring to Fig. 94 and Fig. 95, an apparatus
for forging a semi-finished forged product of the tap apparatus
part of Fig. 93 is explained. Fig. 94 is a plan view
schematically showing an apparatus for forging the semi-finished
forged product of the tap apparatus part and Fig. 95
is a side sectional view of said apparatus.
-
This forging machine has a lower die set and an upper die
set corresponding to the lower die set. The upper die set has
an upper die 19. The lower die set has a lower die 12, a side
straight punch (a first punch) 460, a curved punch (a second
punch) 461, a rotation bar (rod shaped member) 462 for rotating
the curved punch 461, and an ejector pin 15 for sliding the pin
inserting hole of the lower die 12 up and down. The side
straight punch 460 slides horizontally on the upper surface of
the lower die 12. At the tip surface of the side straight punch
460, a cut portion 460a is provided. The shape of this cut
portion 460a is correspond with a shape of the semi-finished
forging product 300B excluding the lower end flash part 301a
and the separating wall flash part 303a of the through passage
301.
-
At the upper surface of the lower die 12, a step forming
hole 12a having a straight part corresponding to the through
passage 301 and a curved part corresponding to the water
spouting passage 303 is provided. At a part of the lower surface
of the upper die 19, which faces to the above-mentioned step
forming hole, a straight and curved step forming hole 19a is
formed. At a die-clamped state, these step forming holes are
connected to each other.
-
The curved punch 461 is so provided as to slide on a
circular arc having a constant curvature radius along with the
vertical axis of the upper surface of the lower die 12. At a
part of the outside of the curved punch 461, a pinion 461a is
provided. The rotation bar 462 is a straight member and driven
by a driving means (not shown in the drawing) to linearly slide
on the upper surface of the lower die. At a part of the rotation
bar 462, racks 462a are provided. These racks 462a are engaged
with the pinion 461a of the curved punch 461.
-
When the rotation bar 462 is driven linearly, the curved
punch 461 rotates along with the vertical rotating axis on a
circular arc. When the curved punch 461 is rotated to the
most-inner part by the rotation bar 462 and further the side
straight punch 460 is inserted into the most-inner part, the
two are positioned not to reach the tip surface of the curved
punch 461 to the cut portion 460a of the side straight punch
460. Also, at this time, the tip surface of the curved punch
461 has reached to the inside of the straight step forming hole
12a" over the curved step forming hole 12a'.
-
At the upper die 19 and the lower die 12, heaters 463 are
provided. Also, a thermocouple 464 is provided at the each dies.
The temperature data measured by the thermocouple 464 are sent
to a temperature controller, and the temperature of the heater
463 is controlled by the controller. At the each outer
peripheral surfaces of the lower die and the upper die, an heat
insulating material 465 and an stainless steel cover 466 are
wound to maintain the temperature. A sheet shaped heat
insulating material 467, an stainless steel plate 468 and a
sheet shaped heat insulating material 469 are held between the
lower die 12 and a body flame, and between the upper die 19 and
the upper slider, heat conductions to the body flame and the
upper slider are prevented.
-
Next, the forging step is explained.
-
Fig. 96 to Fig. 100 are sectional views schematically
showing a step for forging the semi-finished forged product of
the parts of the tap apparatus of Fig. 93.
-
First, as shown in Fig. 96, at the die opening state, each
punch 460 and 461 are moved back, and a heated forging material
300A is set to the step forming hole 12a of the lower die 12.
At this state, the upper die 19 goes down and contacts with the
lower die 12 to die-clamp.
-
Next, as shown in Fig. 97, the side straight punch 460
is driven into a forming hole 12". At this time, a part of the
forging material 300B is fluidized and deformed, and an upper
opening and a hollow part of the semi-finished forging product
are formed. Also, a part of the material is swelled out in the
curved step forming hole 12a'.
-
Next, as shown in Fig. 98, while driving the side straight
punch 460 into, the rotation bar 462 is slid on a linear line
(upper direction of the drawing). At this time, due to engage
of the rack and the pinion, the curved punch 461 rotates to the
inside direction (anti-clock direction of the drawing). At
this time, the forging material swelled out to the curved step
forming hole 12a' is fluidized and deformed by the tip of the
curved punch 461 and a hollow part of a water spouting passage
is formed.
-
Here, since the hollow part is formed by the curved punch
351 while swelling out the material, forming of the hollow shape
becomes easy. Also, since the curved punch 461 is driven into
while driving the side straight punch 460 into, deflection of
the material can be reduced.
-
After finishing of the forming, as shown in Fig. 99, the
side straight punch 460 is moved back to the left direction of
the drawing. Also, the rotation bar 462 is moved back to the
lower direction of the drawing, and the curved punch 461 is
rotated to the outside direction (clock direction of the
drawing) and moved back. Thereafter, the upper die 19 is
returned to the upper limit position.
-
Subsequently, as shown in Fig. 100, the ejector pin 15
of the lower die 12 is risen to remove the semi-finished forged
material 300B.
-
This semi-finished formed product is treated by the
above-mentioned machining, etc., and unnecessary portions are
removed to obtain a final formed product. At this time, the
separating wall flash part 303a is present in the cylindrical
shaped through passage 301 so that it can be easily removed with
the lower edge surface flash part 301a.
-
Next, as the fifteenth example, a shower hanger is to be
explained.
-
Fig. 101 is a drawing showing the structure of a shower
hanger according to the fifteenth example of the present
invention, and (A) is a perspective view, (B) is a side view,
(C) is a front view and (D) is a plane view.
-
The shower hanger 310 is a member substantially
rectangular shape, having a hook part 311 for hooking the shower
at one edge surface and a fixing part 313 to be fixed to the
wall at the other edge surface. The hook part 311 comprises
a key hole shaped groove 311a penetrating from the front surface
to the back surface. The groove 311a is opened to the edge
surface. The key hole shaped groove 311a is also slightly
inclined to the upper direction from the front surface toward
the back surface.
-
On the other hand, the fixing part 313 comprises a hole
having a predetermined depth cut from the edge surface of the
opposed side. This hole is constituted by a box shaped part
313a wherein a sectional surface from the edge surface to a
certain height is rectangle, and a H-shaped part 313b wherein
a sectional surface from the bottom of the box shaped part to
the bottom is H-shaped.
-
Fig. 102 to Fig. 108 are sectional views schematically
showing an apparatus and forging steps for forging the shower
hanger of Fig. 101.
-
This forging machine has an lower die set and a upper die
set corresponding to the lower die set. The lower die set has
a lower die 12, a side punch 470 and an ejector pin 15.
-
The side punch 470 is so provided as to slide the lower
die 12 to the diagonally upper direction. The sectional surface
shape of the side punch 470 is the same as the shape of the key
hole shaped groove 311a of the hook part 311 of the hanger 310.
Also, the sliding direction of the side punch 470 is accorded
with the inclined direction of the key hole shaped groove 311a
of the hook part 311.
-
At the lower die 12, a step forming hole 12a corresponding
to the outer shape of the end surface of the hook part 311 is
provided.
-
The upper die set has an upper die 19 and an upper punch
471 which slides in the upper die up and down. At the upper
punch 471, a cut portion 471a corresponding to the shape of the
box shape part 313a and the H-shaped part 313b of the fixing
part 313 of the hanger 310 is provided.
-
Next, the forging step is explained.
-
First, as shown in Fig. 102, at the die-opening state,
a heated forging material 310A is set to the step forming hole
12a of the lower die 12. Next, as shown in Fig. 103, the upper
die 19 goes down and the lower surface of the upper punch 471
is contacted to the forging material 310A. Incidentally, it
is not necessarily contacted to each other. Subsequently, as
shown in Fig. 104, when the upper punch 471 goes down, then the
forging material 310A is fluidized and deformed and a pressed
part is flowed into the gap between the side punch 470 of the
lower die 12 and the step forming hole 12a to form a hook part
311 at which the key hole state groove is provided. Also, the
part fluidized upward is flowed into the cut portion 471a of
the upper punch 471 so that the fixing part 313 is formed.
-
Next, as shown in Fig. 105, the upper punch 471 is raised.
And, as shown in Fig. 106, the upper die 19 is raised. Next,
as shown in Fig. 107, the side punch 470 is moved back and as
shown in Fig. 108, the ejector pin 15 is raised to remove the
formed product.
-
Next, as the sixteenth example, a part X is explained.
-
Fig. 109 is a longitudinal sectional view showing the
structure of a part X according to the sixteenth example of the
present invention.
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The part X 320 has a closed bottom cylindrical shape as
a whole. At the center of the part X, an axis hole 321 with
a constant inner diameter is provided. The outer surface
thereof comprises an upper small diameter part 322, a flange
part 323, a large diameter part 324 and a lower small diameter
part 325 from the top.
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Fig. 110 to Fig. 119 are sectional views schematically
showing an apparatus and forging steps for forging the part X
of Fig. 1.
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This forging machine has a lower die set and a upper die
set corresponding to the lower die set. The lower die set has
a lower die 12, a lower outer punch 480 which slides in the lower
die 12 up and down, and a lower inner punch 481 which slides
in the lower outer punch 480 up and down.
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The lower inner punch 481 is connected to an actuator (now
shown in the drawing) but the lower outer punch 480 is not
connected to the actuator. At the lower end part of the lower
outer punch 480, a flange 480a is provided. Rising of the punch
480 is stopped by contacting the flange 480a to an upper stopping
surface 12b in the lower die. Descending of the punch 480 is
stopped by contacting the flange 480a to a lower stopping
surface 12c of the lower die 12.
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The upper die set has an upper die 12 and an upper punch
482 which slides in the upper die up and down. At the upper
tip part of said punch 482, a flange 482a is provided.
Descending of the punch 482 is stopped by contacting the flange
482a to a lower stopping surface 19c of the upper die 19.
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At the upper surface of the lower die 12, a step forming
hole 12a is formed. At a part of the lower surface of the upper
die 19, which faces to the above-mentioned step forming hole,
a step forming hole 19a is provided. This step forming hole
is to form the upper small diameter part and the flange part
of the part X. At the die-clamping state, these step forming
holes are connected to each other.
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Next, the forging step is explained.
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First, as shown in Fig. 110, at the die opening state,
a heated forging material 320A is set at the step forming hole
12a of the lower die 12. Next, as shown in Fig. 111, the upper
die 19 and the upper punch 482 are simultaneously gone down,
and the lower surface of the upper die 19 is contacted to the
upper surface of the lower die 12 to die-clamp.
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Next, as shown in Fig. 112, the lower inner punch 481 and
the lower outer punch 480 are raised. At this time, the forging
material is pressed from downward, and fluidized and deformed.
And the upper small diameter part 322 and the flange part 323
are formed, and a part of the axis hole 321 is starting to be
formed.
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Next, as shown in Fig. 113, the upper punch 482 goes down.
According to the pressure difference between the pressing force
of the upper punch 482 and the back pressure to the lower inner
punch 481 and the lower outer punch 480, the lower inner punch
481 and the lower outer punch 480 go down. At this time, the
axis hole 321 is further formed. The lower outer punch 480 goes
down, as shown in Fig. 114, until the flange 480a of said punch
480 contacts with the lower stopping surface 12c of the lower
die 12. At this state, as shown in Fig. 115, the upper punch
482 goes down until the flange 482a contacts with the lower
stopping surface 19c, and simultaneously the lower inner punch
481 goes down. At this time, the lower small diameter part 325
is formed and the axis hole 321 is further deeply formed. At
the lower inner punch 481, the back pressure is still applied.
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Next, as shown in Fig. 116, the upper punch 482 is raised.
Subsequently, as shown in Fig. 117, the upper die 19 is raised.
Next, as shown in Fig. 118, the lower inner punch 481 is raised.
Finally, as shown in Fig. 119, the lower outer punch 480 is raised
with the lower inner punch 481 to remove the formed product.
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Next, as the seventeenth example, a part Y is explained.
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Fig. 120 is a longitudinal sectional view showing the
structure of a part Y according to the sixteenth example of the
present invention.
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The part Y 330 is a conical shaped solid part as a whole.
The part Y 330 has a flange part 331 and under the flange part
331, a large diameter part 332, a small diameter part 333 and
an axis part 334 are continuously provided.
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Fig. 121 to Fig. 130 are sectional views schematically
showing an apparatus and forging steps for forging the part Y
of Fig. 120.
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This forging machine has an lower die set and a upper die
set corresponding to the lower die set. The lower die set has
a lower die 12, a lower inner punch 490 which slides in the lower
die 12 up and down, and a double lower outer punch. The lower
inner punch 490 is connected to an actuator (now shown in the
drawing), but the lower outer punch is not connected to the
actuator. The lower outer punch comprises an inside outer punch
491 and an outside outer punch 492.
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At the lower end part of the outside outer punch 492, a
flange 492a is provided. Rising of said punch 492 is stopped
by contacting the flange 492a to an upper stopping surface 12c
of the lower die 12. Descending of the punch 492 is stopped
by contacting the flange 492a to a lower outer stopping surface
12d of the lower die 12.
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At the lower end part of the inside outer punch 491, a
flange 491a is provided. Rising of said punch 491 is stopped
by contacting the flange 491a to the flange 492a of the outside
outer punch 492. Descending of the punch 492 is stopped by
contacting the flange 492a to a lower inner stopping surface
12e of the lower die 12.
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At the lower die 12, a step forming hole 12a is provided.
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The upper die set has an upper die 19 and an upper punch
493 which slides in the upper die 19 up and down. At the upper
end part of the upper punch 493, a flange 493a is provided.
Descending of the punch 493 is stopped by contacting the flange
493a to a lower stopping surface 19c of the upper die 19.
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Next, the forging step is explained.
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First, as shown in Fig. 121, at the die opening state,
a heated forging material 330A is set at the step forming hole
12a of the lower die 12. Next, as shown in Fig. 122, the upper
die 19 and the upper punch 493 simultaneously go down, and the
lower surface of the upper die 19 is contacted to the upper
surface of the lower die 12 to die-clamp. Next, as shown in
Fig. 123, the upper punch 493 goes down.
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Next, as shown in Fig. 124, the upper punch 493
continuously goes down. According to the pressure difference
between the pressing force of the upper punch 493 and the back
pressure to the lower inner punch 490 and the lower outer punch,
the lower inner punch 490 and the lower outer punch
simultaneously go down. The outside outer punch 492 goes down
until the flange 492a contacts with the outer stopping surface
12d. At this time, parts of the flange part 331 and the large
diameter part 332 are starting to be formed. Subsequently, as
shown in Fig. 125, the upper punch 493 goes down, and the lower
inner punch 490 and the inside outer punch 491 simultaneously
go down. The outside outer punch 492 is stopped at a lower
stopping surface 12d of the lower die 12. The inside outer punch
491 goes down until it contacts with an inner stopping surface
12e. At this time, the flange part 331 and the large diameter
part 332 are further formed, and the small diameter part 333
is starting to be formed.
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Subsequently, as shown in Fig. 126, the upper punch 493
goes down until the flange 493a of said punch 493 contacts with
a lower stopping surface 19c of the upper die 19. The lower
inner punch 490 continuously goes down. At this time, the
flange part 331, the large diameter part 332, the small diameter
333 and the axis part 334 are formed. To the lower inner punch
490, the back pressure is continuously applied.
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Next, as shown in Fig. 127, the upper punch 493 is raised.
Subsequently, as shown in Fig. 128, the upper die 19 is raised.
Subsequently, as shown in Fig. 129, the lower inner punch 490
is raised. And, as shown in Fig. 130, the lower outer punches
491 and 492 are further raised with the lower inner punch 490
to remove the formed product.
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Next, as the seventeenth example, a part Z is explained.
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Fig. 131 is a longitudinal sectional view showing the
structure of a part Z according to the seventeenth example of
the present invention.
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The part Z 340 has a cylindrical shape as a whole and a
longitudinal sectional surface is H-shaped. The part Z 340 has
an upper recessed part 341 and a lower recessed part 342. Near
to the upper end of the upper recessed part 341, a flange 343
is provided. At said flange 343, a circular projection part
344 extending upward is provided.
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Fig. 132 to Fig. 141 are sectional views schematically
showing an apparatus and forging steps for forging the part Z
of Fig. 131.
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This forging machine has an lower die set and a upper die
set corresponding to the lower die set. The lower die set has
a lower die 12, a lower inner punch 500 which slides in the lower
die 12 up and down, and a lower outer punch 501. The lower outer
punch 501 is connected to an actuator (not shown in the drawing)
but the lower inner punch 500 is not connected to the actuator.
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At the lower outer punch 501, an upper flange 501a is
provided at the lower end part thereof. At the lower surface
of the flange 501a, a rod 501b is so provided to extend downward.
To the lower end part of said rod 501b, a lower flange 501c is
attached.
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At the lower end part of the lower inner punch 500, a flange
500a is provided. The rod 501b of the lower outer punch 501
is slidably penetrated in the flange 500a of the lower inner
punch 500. Accordingly, the lower inner punch 500 slides
between the upper flange 501a and the lower flange 501c of the
lower outer punch 501 along with the rod 501b. Descending of
the lower inner punch 500 is stopped by contacting the flange
500a to a lower stopping surface 12b of the lower die 12.
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The upper die set has an upper die 19 and an upper punch
502 which slides in the upper die 19 up and down. At the upper
end part of the upper punch 502, a flange 502 is provided. The
punch 502 is stopped by contacting the flange 502a to a lower
stopping surface 19c of the upper die 19.
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At the upper surface of the lower die 21, a forming hole
12a is provided. At the part of the lower surface of the upper
die 19, which faces to the above-mentioned forming hole, a step
forming hole 19a is provided. These forming holes are connected
to each other at the die-clamping state.
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Next, the forging step is explained.
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First, as shown in Fig. 132, at the die opening state,
a heated forging material 340A is set at the forming hole 12a
of the lower die 12. Next, as shown in Fig. 133, the upper die
19 and the upper punch 502 simultaneously go down, and the lower
surface of the upper die 19 is contacted to the upper surface
of the lower die 12 to die-clamp.
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Next, as shown in Fig. 134, the lower outer punch 501 is
raised with the lower inner punch 500. At this time, the forging
material is fluidized and deformed, and the circular projection
344 and the flange 343 are formed by the portion pressed upward.
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Next, as shown in Fig. 135, the upper punch 502 goes down.
In accordance with the pressure difference between the pressing
force of the upper punch 502 and the back pressure to the lower
inner punch 500 and the lower outer punch 501, the lower outer
punch 501 and the lower inner punch 500 simultaneously go down.
At this time, the upper recessed part 341 is starting to be formed.
Subsequently, as shown in Fig. 136, the upper punch 502
continuously goes down, and the lower inner punch 500
simultaneously goes down. The lower inner punch 500 goes down
until the flange 500a of said punch 500 is contacted to a lower
stopping surface 12b of the lower die 12. At this time, the
upper recessed part 341 is further deeply formed.
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Next, as shown in Fig. 137, the upper punch 502 further
goes down until the flange 502a of said punch 502 is contacted
to a lower stopping surface 19c of the upper die 19. The lower
outer punch 501 further goes down along with the rod 500b of
the lower inner punch 500. The lower outer punch 501 goes down
until the upper flange 501a of said punch 501 is contacted to
the flange 500a of the lower inner punch 500. Incidentally,
it is not necessarily contacted to each other. At this time,
by the upper punch 502, the upper recessed part 341 is completely
formed. Further, by going the lower outer punch 501 down, the
lower recessed part 342 is formed.
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Next, as shown in Fig. 138, the upper punch 502 is raised.
Subsequently, as shown in Fig. 139, the upper die 19 is raised.
Next, as shown in Fig. 140, the lower outer punch 501 is raised.
Finally, as shown in Fig. 141, the lower inner punch 500 is raised
with the lower outer punch 501 to remove the formed product.