JPH08276248A - Shell molding machine - Google Patents

Abstract

PURPOSE: To easily and rapidly realize the simultaneous operation of a spiny insert by forming a cavity with a plurality of continuous recessed parts in an upper pattern opposite to a plurality of inserts for making goods of a lower pattern. CONSTITUTION: A shell molding machine is provided with a lower pattern and an upper pattern. A plurality of half-split cylindrical inserts 12A, 12B for making goods are arranged on the lower pattern, and a spiny insert 22 insert recessed part is formed on an undercut part formed by the adjacent inserts 12A, 12B for making goods. The spiny insert 22 which is provided with the surface of the same curvature as that of the semi-circular surface 23a of the inserts 12A, 12B for making goods and provided with a number of projections 24 on this surface is depressably provided. A cavity with a plurality of continuous recessed parts corresponding to a plurality of inserts 12A, 12B of the lower pattern is formed on the upper pattern body. The spiny insert 22 is simultaneously depressable by a spiny insert operating means. The surface of the spiny insert agrees with the semi-circular surface of the insert for making goods.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shell molding machine for molding a shell mold for casting a cylindrical product such as a sleeve of a cylinder block.

[0002]

2. Description of the Related Art Generally, a cylinder block 80 is shown in FIG.
As shown in FIG. 8, a cylindrical sleeve 81 is manufactured by casting, and the sleeve 81 is placed in a cavity of a die casting mold.
A plurality of aluminum alloys are housed side by side, and a molten aluminum alloy is injected into the cavity by a die casting method.

In this case, a sleeve having a large number of projections on its surface is used in order to well bite the sleeve 81 into the aluminum alloy block body 82.
Such sleeves have been produced one by one in a cylindrical shape by casting using a sand mold made of green sand or hard sand.

[0004]

Since the sleeve having a large number of protrusions formed on the surface thereof is manufactured in a cylindrical shape by casting using a sand mold made of raw sand or slag hard sand, a storage core is required. It is very laborious, inefficient, inefficient,
There is a problem that it is not possible to mass-produce two or more sleeves.

The present invention solves the above-mentioned problems, and an object of the present invention is to enable simultaneous and quick operation of a plurality of spiny nests,
It is an object of the present invention to provide a shell-type molding apparatus that can easily mass-produce the half-shaped shell mold and that can easily mold the shell mold.

[0006]

In order to achieve the above object, in a shell-type molding apparatus according to the present invention, a plurality of cylindrical product inserts each having a half-divided shape are arranged so that arc-shaped surfaces of adjacent product inserts are formed. The undercut portions are formed with spiny nesting insertion recesses, and the spiny nesting recesses having the same curvature as the arc-shaped surface of the product nest and having a large number of projections on the surface are intruded into and out of these spiny nesting insertion recesses. A lower mold that can be provided, an upper mold that has a cavity formed by continuously forming a plurality of concave portions facing the plurality of product molds of the lower mold in the upper mold body, and a spiny mold that causes the spiny mold to move in and out at the same time. And an actuating means.

Then, the spiny nest actuating means includes a pull-out pin connected to the spiny nest,
It may be configured to have a sliding block that simultaneously operates these pull-out pins and an operation cylinder that operates this sliding block.

Also, the spiny nesting operating means is
A sliding block positioning arm and a cylinder holding member are fixedly provided on both sides of the lower mold, and one sliding block positioning arm positions and holds one sliding block so as to be movable toward the spine nesting side, and the other one. A sliding block positioning arm movably positions and holds the other sliding block on the side of the spine nest, and one and the other sliding blocks hold the ends of a plurality of extraction pins connected to the spiny nest. Alternatively, one cylinder holding member may be provided with one operating cylinder that operates one sliding block, and the other cylinder holding member may be provided with the other operating cylinder that operates the other sliding block.

[0009]

With this structure, the upper mold is fitted to the lower mold,
Insert the product insert of the lower mold into the concave part of the cavity, form a space in the shape of the sand mold to be molded between them, blow the shell sand into the space, and heat the upper and lower molds. When the shell sand is hardened to form the shell mold, the spiny nest actuating means is activated to retract the spiny nest at the same time, and the recesses of the multiple projections of the spinee nest are formed in the undercut portion of the inner surface thereof. A half-shell type shell having a large number of is formed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a side view showing a partial cross section of a shell-type molding apparatus according to the present invention, and FIG. 2 is a cross sectional view taken along line AA of FIG.
3 is a sectional view taken along the line BB of FIG. 2, and FIG. 4 is a sectional view of FIG.
It is sectional drawing which follows the C line.

The shell-type molding apparatus according to the present invention comprises a lower mold 1
And the upper mold 2 are roughly configured. The lower mold 1 is provided with a die base 4 fixedly mounted on a pedestal 3, and a lower mold heating plate body 5 is fixedly mounted on the die base 4, and the lower mold heat A product nesting structure 11 is attached to the plate body 5. The lower mold hot plate body 5 and the product nesting structure 11 constitute a lower mold body.

The lower hot plate body 5 has a hot plate block body 6 which is rectangular in plan view as shown in FIGS. 6 to 8. The hot plate block body 6 has an upper surface portion 6A. The left side (MS side) and 2 with the center as Sakai seen from the worker side P
Nested recessed group 7 in each row, 2 rows on the right side (MP side)
Is provided. These nesting mounting recess groups 7 are formed by arranging four nesting mounting recesses 8 at a predetermined interval in the front-rear direction when viewed from the operator side P. A plurality of sand removing holes 9 are formed in the bottom surface of these nesting mounting recesses 8, and these sand removing holes 9 are cut out to the lower surface portion 6B of the hot plate block body 6.

Further, in the hot plate block main body 6, three pin insertion holes 10 are obliquely (tilted forward) from the front side (worker side P) of the hot plate block main body 6 toward the three front nesting recesses 8. Further, three pin insertion holes 10 are formed obliquely (rearward) from the rear surface side toward the three rear side nesting mounting recesses 8. Further, a large number of heater insertion holes 60 are formed in the left surface portion and the right surface portion of the hot plate block body 6, and heaters 61 are inserted into these heater insertion holes 60 (see FIG. 1).

As shown in FIGS. 9 to 13, the product nesting structure 11 includes two rows of four product nesting groups 12, each of which has a front product nest 12A. It has two intermediate product inserts 12B and a rear product insert 12C. The product nest 12A on the front side has a configuration in which a rectangular fitting portion 14 is formed in a lower portion of a nest body 13 having a semicircular cross section, and a flat mating surface portion 15 is formed in a rear portion of the nest body 13. In the rear portion of the surface of the main body 13, a rectangular spiny insert insertion recess 16 is formed in plan view. In addition, from the front surface of the fitting portion 14, the spiny nesting insertion concave portion 16 is formed.
Has a rod insertion hole 17 extending from the end face thereof to the fitting portion 14
A sand removing hole 18 is formed to extend to the lower surface of the.

The intermediate product insert 12B has a rectangular fitting portion 14 at the bottom of the insert main body 13 having a semicircular cross section.
Is formed, and flat mating surface portions 15 are formed on the front and rear portions of the nesting body 13, and rectangular spiny nesting insertion concave portions 16 having a rectangular shape in plan view are formed on the front and rear portions of the surface of the nesting body 13. There is. Further, a rod insertion hole portion 17 is formed from the front surface portion of the fitting portion 14 to the end surface of the rear side spiny nesting insertion concave portion 16, and the rear surface portion of the fitting portion 14 is located at the front side of the spiny nesting insertion concave portion 16.
A rod insertion hole portion 17 is formed so as to extend to the end surface of the. In addition, from the spiny nesting insertion concave portion 16 to the fitting portion 14
A sand removing hole 18 is formed to extend to the lower surface of the.

The product insert 12C on the rear side has a rectangular fitting portion 14 at the bottom of the insert main body 13 having a semicircular cross section.
To form a flat mating surface portion 15 on the front portion of the nesting body 13.
Is formed, and is a rectangular shape in the plan view of the front side portion of the surface of the nesting main body 13 in the shape of a rectangular spiny nesting insertion recess 16
Is formed. Further, a rod insertion hole portion 17 is formed from the rear surface portion of the fitting portion 14 to the end surface of the spiny nesting insertion concave portion 16, and a sand removing hole is formed from the spiny nesting insertion concave portion 16 to the lower surface portion of the fitting portion 14. 18 is formed.

Then, the rod insertion hole portion 1 in the front, middle and rear product nests 12A, 12B and 12C.
7 has a small diameter on the side of the nesting mounting recess 8 with a middle portion thereof serving as a sakai, and a step portion 17C is formed between the large diameter hole portion 17A and the small diameter hole portion 17B. In the rod insertion hole portion 17, all the length dimensions L1 of the small diameter hole portions 17B are the same.

Then, a set of four product nests 12 is mounted in each set of four recessed fitting recesses 7 of the lower hot plate member 5. That is, the product insert 12A on the front side is fixed by bolting after fitting the fitting portion 14 to the front spiny insert mounting recess 8 of the nest mounting recess group 7, and the intermediate product insert 12B is the same. And the rear product nest 12C is similarly mounted in the rear nesting fitting recessed portion 8 of the nesting fitting recessed portion group 7.

In this case, adjacent product nests 12A, 1
2B and 12C are in contact with each other at a mating surface portion 15, and a spiny nesting insertion recess 16 is provided in an undercut portion R formed by the arc-shaped surfaces of adjacent product nests 12A, 12B and 12C. The sand removal holes 18 formed in these spiny nesting insertion recesses 16 communicate with the sand removal holes 9 provided in the lower mold hot plate body 5.

Further, the rod insertion hole portion 17 of the front product insert 12A and the front rod insertion hole portion 17 of the two intermediate product inserts 12B have three front pin insertions provided in the lower mold hot plate body 5. The rod insertion hole 17 on the rear side of the product insert 12C and the two intermediate product inserts 12B, which communicates with the hole 10, is provided on the rear side 3 provided on the lower mold hot plate body 5.
It communicates with the pin insertion hole 10 of the book.

A spacer block 19 is interposed between the inner end faces of the product nests 12A, 12B and 12C of the two product nest groups 12 facing each other. The spacer blocks 19 are bolted to the lower mold. It is fixed to the heating plate 5. Also, product nests 12A, 12B, 12
At the outer end of C, left and right end pressing members 20 and 21 are provided by being fixed to the lower mold hot plate body 5 by bolts.

A spline nest 22 is inserted in the spline nest insertion recess 16 so as to be retractable. As shown in FIGS. 14 to 17, the spiny nest 22 has a nest body 23, and the surfaces of the nest body 23 are front, middle, and rear product nests 12A, 12B,
It is an arcuate surface 23a having the same curvature as the surface of 12C, and many projections 24 are formed on this arcuate surface 23a. Further, the nest body 23 is provided with two rods 25 so as to project downward, and an end portion of the rod 25 is formed as a screw portion 25a.

In the spine nest 22 having the above-mentioned structure, the rod 25 is attached to the rod insertion hole 1
7 is inserted into the spiny nesting insertion concave portion 16 so as to be retractable.

The front and rear parts of the die base 4 are shown in FIG.
3, sliding block positioning arms 26 and 27 are fixedly installed at the left and right, and a cylinder holding member 28 is provided at an intermediate portion of the front and rear portions of the die base 4 as shown in FIG. , 29 are fixed. The front (one) left and right sliding block positioning arms 26 have a pair of support piece portions 30, and these support piece portions 30 are provided.
A pin hole 31 is formed in this. The front left and right sliding block positioning arms 26 position and hold the front (one) sliding block 32A.

That is, this sliding block 32A is shown in FIG.
As shown in FIGS. 8 and 19, a block main body 33 having a rectangular cross section is provided, and pin sliding mechanism portions 34 are provided at both ends of the block main body 33. The pin sliding mechanism portion 34 has a hole portion 33 formed in the block body 33.
The guide bushes 35 and 36 are inserted into a and the guide bushes 35 and 36 are pressed by the bush pressers 37 and 38. Further, a pair of three pin insertion holes 39 are formed in parallel in the vertical direction on each of the two left and right positions on the block body 33. The pin insertion holes 39 are shown in FIG. As shown, the pin receiving member 40 is fixedly provided on the block body 33. This pin receiving member 4
A screw hole 41 is formed at 0 so as to face the end face portion of the pin insertion hole 39.

In the sliding block 32A constructed as described above, the guide bushes 35 and 36 of the pin sliding mechanism portion 33 can slide on the sliding pin 42 supported by the pair of supporting piece portions 30. It is held by the left and right sliding block positioning arms 26 on the front side.

As shown in FIG. 5, the pull-out pin 43 has a screw hole 43a at its front end surface and a polygonal (octagonal) flange 43b at its rear end. The pull-out pin 43 is connected to the pin insertion hole 3 of the sliding block 32.
9, the withdrawal pins 43 are inserted into the pin insertion holes 10 and the screw portions 25a of the rods 25 of the spiny insert 22 are screwed into the screw holes 43a of the withdrawal pins 43. The pull-out pin 43 is connected to the spiny nest 22. In this case, a stopper portion 43F is formed between the rod 25 and the end portion of the extraction pin 43. In addition, the pin receiving member 40 has a polygonal shape (octagonal) for stopping the rotation of the pull-out pin 43.
The washer 40A is inserted.

Further, the screw hole 41 of the pin receiving member 40
The adjusting bolts 44 are screwed into the end of the adjusting bolts 44 and between the end faces of the adjusting bolts 44 and the end faces of the collar-like portions 43b of the extracting pins 43 in order to absorb the length displacement due to the thermal expansion of the extracting pins 43. Gap t is formed. And
One working cylinder 45A is attached to the front side (one side) of the cylinder holding member 28.
The A piston rod 46A is fixed to the central portion of the sliding block 32A. And the working cylinder 4
5A, the sliding block 32A, and the pull-out pin 43 constitute a spiny nesting operation means.

Also, the rear (other) sliding block 32B
Has the same configuration as the front sliding block 32A, and the rear sliding block 32B is positioned and held by the rear (other) left and right sliding block positioning arms 27 in the same manner as the front sliding block 32A. In addition, the pull-out pins 43 are inserted into the pin insertion holes 39 of the sliding block 32B.
0 is inserted in the screw hole 43 of the extraction pin 43,
The threaded portion 25a of the rod 25 of the spiny nest 22
Are screwed together, and the extraction pin 43 is connected to the spiny nest 22.

Then, the other working cylinder 45B is attached to the rear (other) cylinder holding member 28,
The piston rod 46B of the working cylinder 45B is fixed to the central portion of the sliding block 32B. Then, the working cylinder 45B and the sliding block 32B
The pull-out pin 43 and the pull-out pin 43 constitute a spiny nesting operation means.

Further, as shown in FIG. 2, the pedestal 3, the die base 4, and the lower mold hot plate body 5 are provided with eject pin holes 46 at a plurality of positions. An eject pin 47 is inserted in 46,
These eject pins 47 are connected to each other and are moved up and down by an eject raising / lowering operation mechanism section (not shown), and these constitute push-up means.

The upper mold 2 has an upper mold body 48,
As shown in FIGS. 22 to 24, the upper mold body 48 has a cavity 50 formed on the mold matching surface 49 side, and the cavity 50 forms the product nest 12A of the lower mold 1,
A plurality of recessed portions 51 facing 12B and 12C are formed continuously, and a gate 52 communicating with each recessed portion 51 is provided in the upper mold body 48. Also, the upper mold body 48
Has a heater insertion hole 6 that goes from the front to the rear.
2 are formed in large numbers, and heaters 63 are inserted into these heater insertion holes 62. Also, the upper mold 2 is
It is moved up and down by an up-and-down actuating mechanism (not shown) which is an upper die moving means.

Next, description will be made on the molding of a shell mold by the shell molding device for a cylindrical body having the above-mentioned structure.

In the lower mold 2, the working cylinder 4
5A and 45B are extended to operate the sliding block 32.
By moving (advancing) A and 32B, the pull-out pin 43 is moved, and the end surface 43F of the pull-out pin 43 is brought into contact with the step portion 17C of the rod insertion hole 17. Therefore, the spiny nest 22 coupled to the pull-out pin 43 is advanced at the same time, and the arcuate surface 23a of the spiny nest 22 is attached to the front, middle, and rear product nests 12.
A large number of protrusions 24 on this arcuate surface 23a are projected in conformity with the surfaces of A, 12B and 12C.

Next, the upper die 2 is lowered by the operation of the elevating and lowering mechanism, and the die matching surface 49 of the upper die body 48 is moved.
Is aligned with the mating surface 65 of the lower mold body 64, and the product insert 12A of the lower mold 1 is inserted into the concave portion 51 of the cavity 50.
12B and 12C are inserted, and a space H in the shape of a sand mold to be molded is formed between them.

Next, shell sand (silica sand plus thermosetting polymer material) is blown into the space H from the plurality of gates 52 provided in the upper mold body 48.

Next, the heaters 61 and 63 provided on the upper and lower molds 1 and 2 are energized to raise the temperature to about 350 ° C.
4 and product nests 12A, 12B, 12C are heated.
This heating cures the shell sand and molds the shell mold 70.

Next, the energization of the heaters 61 and 63 is stopped, the upper die 2 is raised by the operation of the elevating and lowering mechanism, and the upper die 2 is separated from the lower die 1. In this state,
A shell mold 70 is attached to the product inserts 12A, 12B, 12C side of the lower mold 1.

Next, in the lower mold 2, the actuating cylinders 45A and 45B are contracted to retract the sliding blocks 32A and 32B, thereby retracting the pull-out pin 43 and simultaneously moving the spiny insert 22. The arcuate surface 23a is retracted and pulled in from the surfaces of the front, middle, and rear product nests 12A, 12B, 12C, and a large number of protrusions 24 provided on the arcuate surface 23a.
Is released from the shell mold 70. In this case, the protrusion 2
When the length of 4 is about 2 mm, the retracted amount of the spiny nest 22 is about 5 mm.

Next, the eject raising / lowering operation mechanism is operated to raise the eject pin 47 to raise the shell mold 70.
Is pushed up and the shell mold 70 is released. This shell mold 70 has a half-divided shape, and a large number of recesses of the reverse copy of the large number of protrusions 24 of the spiny insert 22 are formed in the undercut portion of the inner surface thereof.

Next, in the next step, as shown in FIG. 25, four bore cores 71 are set, and the mating surface portions 70A of the shell mold 70 having a half-divided shape are bonded together with an adhesive agent to form a shell. A mold template is created.

After this shell mold mold is transported to the casting place, aluminum alloy is poured in the casting process to cast four sleeves W shown in FIG. A large number of protrusions 24 'are formed on the undercut sleeve R'of the sleeve W. Then, the sleeve W is cast into an aluminum alloy by a die casting method to form a cylinder block S shown in FIG.

[0043]

As described above in detail, in the shell-type molding apparatus according to the present invention, a plurality of product inserts each having a half-cylindrical shape are arranged in the undercut portion formed by the arc-shaped surfaces of the adjacent product inserts. The lower part of the spiny nesting insert recesses has a surface having the same curvature as the arcuate surface of the product nest and a large number of protrusions are formed on the surface of the spliner nesting recesses. A mold, an upper mold having an upper mold body having a cavity formed by continuously forming a plurality of recesses facing the plurality of product molds of the lower mold, and a spiny nest actuating means for simultaneously projecting and retracting the spiny nest. As a result, the upper mold is aligned with the lower mold, the product insert of the lower mold is inserted into the concave portion of the cavity, and a space of the sand mold shape is formed between the two. When the shell sand is blown into the space and the upper and lower molds are heated to harden the shell sand to form the shell mold, the spiny nest operating means operates to retract the spiny nest at the same time. ,
It is possible to manufacture a shell mold of a half-divided shape in which a large number of recessed portions of the reverse projection of a large number of protrusions of the spiny nest are formed in the undercut portion of the inner surface. Further, by reversely operating the spiny nest actuating means, it is possible to project the spiny nest at the same time so that the surface of the spiny nest coincides with the arc-shaped surface of the product nest.

As described above, the simultaneous operation of the spiny nests can be performed easily and quickly, and the shell mold having the half-split shape can be easily mass-produced.

Further, the spiny nesting operating means is
The pull-out pins connected to the spiny nest, the slide block for simultaneously operating these pull-out pins, and the operating cylinder for operating the slide blocks facilitate the simultaneous operation of the spiny nest. In addition, it can be carried out quickly, and the shell mold having a half-divided shape can be easily mass-produced.

Further, the spiny nesting operating means is
A sliding block positioning arm and a cylinder holding member are fixedly provided on both sides of the lower mold, and one sliding block positioning arm positions and holds one sliding block so as to be movable toward the spine nesting side, and the other one. A sliding block positioning arm movably positions and holds the other sliding block on the side of the spine nest, and one and the other sliding blocks hold the ends of a plurality of extraction pins connected to the spiny nest. The one cylinder holding member is provided with one operating cylinder for operating one sliding block, and the other cylinder holding member is provided with the other operating cylinder for operating the other sliding block. Simultaneous actuation of the inserts can be performed easily and quickly, and the shell mold of the half-split shape can be easily mass-produced. Can.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional side view of a shell-type molding apparatus according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

3 is a cross-sectional view taken along the line BB of FIG.

4 is a cross-sectional view taken along the line CC of FIG.

5 is an enlarged view of a portion D in FIG.

FIG. 6 is a plan view of a lower hot plate body.

7 is a cross-sectional view taken along the line EE of FIG.

8 is a cross-sectional view taken along the line FF of FIG.

FIG. 9 is a plan view of a product nesting structure.

10 is a sectional view taken along the line GG in FIG.

11 is a partial cross-sectional view taken from the direction I in FIG.

FIG. 12 is a plan view of a single product nest.

FIG. 13 is a side view of a single product nest.

FIG. 14 is a plan view of a spiny nest.

FIG. 15 is a side view of the same spiny nest.

16 is a sectional view taken along the line JJ of FIG.

17 is a cross-sectional view taken along the line KK of FIG.

FIG. 18 (1) is a front view of a sliding block mechanism portion. (2) is a sectional view taken along line LL of (1).

FIG. 19 (1) is a front view of a sliding block.
(2) is a sectional view in which the same portion is omitted. (3) is (2)
FIG. 6 is a view from the direction M in FIG.

FIG. 20 is a plan view of the pin receiving member.

21 is a cross-sectional view taken along the line NN of FIG.

FIG. 22 is a plan view of the upper mold.

23 is a cross-sectional view taken along the line OO of FIG.

24 is a cross-sectional view taken along the line QQ of FIG.

FIG. 25 is a plan view of a shell mold including a bore core and a half-shell type mold.

FIG. 26 is a perspective view of a quadruple sleeve.

FIG. 27 is a perspective view of a cylinder block.

FIG. 28 is a perspective view of a conventional cylinder block.

[Explanation of symbols]

 1 Lower Mold 2 Upper Mold 12A, 12B, 12C Product Nesting 16 Spiny Nesting Inserting Recess 22 Spiney Nesting 23a Arc Surface 24 Protrusion 26, 27 Sliding Block Positioning Arm 28, 29 Cylinder Holding Member 32A, 32B Sliding Block 45A, 45B Working cylinder

Claims (3)

[Claims] 1. A plurality of semi-cylindrical product inserts of a cylindrical body are arranged, and a spiny insert insertion recess is formed in an undercut portion formed by an arcuate surface of an adjacent product insert. A lower mold that has a surface with the same curvature as the arc-shaped surface of the product insert and has a number of protrusions on this surface so that it can be retracted, and the upper mold body faces the multiple product inserts of the lower mold. A shell-type molding apparatus comprising: an upper mold having a cavity formed by connecting a plurality of recessed portions to each other, and spiny nest actuating means for simultaneously moving the spiny nest in and out. 2. The spiny nest actuating means includes a withdrawal pin connected to the spiny nest, a slide block for simultaneously operating these withdrawal pins, and an operating cylinder for operating the slide block. The described shell-type molding apparatus. 3. The spiny nest actuating means has sliding block positioning arms and cylinder holding members fixed to both sides of the lower die, and one sliding block positioning arm is used to slide one of the sliding blocks. Positioned and held movably on the nest side, the other slide block positioned and held by the other slide block positioning arm so that it can move to the spiny nest side, and connected to the spline nest by one and the other slide block One cylinder holding member is provided with one working cylinder that holds one end of the plurality of extracted pulling pins, and the other cylinder holding member works the other sliding block. A structure provided with an operating cylinder.
The described shell-type molding apparatus.