JPH0735678Y2 - Powder molding equipment - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder molding apparatus, and is particularly suitable for molding a powder compact having a slope or a partly or wholly changed on one side and thinned on the other side. It is a thing.

[0002]

2. Description of the Related Art In a conventional powder molding apparatus, since the upper surfaces of a die and a table are horizontal planes, for example, as shown in FIG.
12, a part or all of which is changed so that one side is thicker and the other side is thinner, or has a sloped surface,
When molding 92, 93, etc., the pressing surface is inclined, the compression ratio of the powder is not uniform, the thin part has a high density, and the thick part has a low density. I couldn't get a body. To solve this problem, multiple lower punches are used to adjust the amount of powder filled on each lower step to obtain a uniform density, or a die is formed by making a hole in the front part of the feeder that supplies the powder. For example, the powder is left in the upper part to be raised, and if necessary, a groove is formed in a die to allow the powder to escape during pressurization. However, in all cases, a uniform and stable density cannot be obtained and the apparatus becomes complicated.

[0003]

SUMMARY OF THE INVENTION The present invention has a simple structure so that a part or the whole can be changed so that one side is thicker and the other side is thinner, or a compact having an inclined surface can be molded to a uniform density. The present invention provides the powder molding device.

[0004]

This invention proposes a lower punch that can be moved up and down, a die that can penetrate the lower punch and that has a hole for containing powder when the lower punch descends, and a die that surrounds the die. A surrounding table, a feeder for reciprocating in a predetermined direction along the die and the upper surface of the table to supply powder to the hole of the die, and a vertically punchable lower punch inserted into the hole of the die from above. jointly with the one having a punch on which the powder is compressed compact, the upper surface of the die and the table has an inclined portion to rise in Oite one side in the moving direction perpendicular to the direction of Fuida A powder having a desired cross-sectional shape, and the feeder has a shape such that a portion crossing the moving direction thereof is along the upper surfaces of the die and the table. There is provided a shape device.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. In one embodiment of the present invention shown in FIGS. 1 to 6, 10 is a main body, and 12 is a bolt 1 on the top of the main body.
The die 3 fixed by using the mounting member 15 by 3, and the hole 16 formed in the central portion of the die through the vertical direction. Reference numeral 17 denotes a table which is detachably fixed to the main body 10 by a means (not shown) and surrounds the die 12. Reference numeral 18 denotes a lower punch in which the upper end surface 20 is inserted into the hole 16 in a desired shape suitable for molding the powder compact 91 shown in FIGS. 7 and 8 , and the female screw member 22 is provided at the upper end of the lower ram 21. It is fixed by using. 23 is powder 90
The feeder 90 supplies powder 90 from a hopper (not shown) through the hose 24 so as to reciprocate within the range of the solid line and the chain line in the direction of the arrow in FIG. Partition members 25 and 2 extending to
6 are detachably attached to both sides by screws 27. An inclined portion 28 and a groove 30 are formed on the upper surface of the die 12 and the table 17 subsequent thereto so as to be suitable for molding the green compact 91. The inclined portion 28 and the groove 30 are formed so as to be orthogonal to the movement direction of the feeder 23 and have the same sectional shape. This inclined portion 28 is provided on the feeder 23.
And partition members 25 and 26 so that they can move along the groove 30.
An inclined portion 31 and a protruding portion 32 are formed on the.

An upper punch 33 has a lower end surface 35 having a desired shape, and is fixed to a lower end portion of an upper ram (not shown) which can be moved up and down. Various powders may be used as the powder 90, for example, Fe powder 94.3%, Cu powder 2%, N
It is possible to use a mixed powder that is fluid and hard to disintegrate by mixing 2% by weight of solid paraffin with 3% of i powder and 0.7% of graphite.

When the feeder 23 moves from the position shown by the chain line in FIG. 3 to the position shown by the solid line and returns to the initial position again, the powder 90 remains on the lower punch 18 in the hole 16 as shown in FIG. Will be filled. Next, as shown in FIG. 5, the upper punch 33 descends and the powder 90 is pressure-molded between the upper punch 33 and the lower punch 18 to form a green compact 91. Next, the upper punch 33 rises, and subsequently, the lower punch 18 rises to lift and take out the green compact 91 as shown in FIG. After that, the lower punch 18 descends and the feeder 23 moves above the hole 16, and the same operation is repeated. The green compact 91 thus obtained had a density difference of 2% or less in each part.

In this invention, for example, in FIGS.
Various green compacts such as the green compact shown by 2 and the green compact indicated by 93 in FIGS. 11 and 12 can be molded. Of these, green compact 9
Since there is a hole in the center of the core 3, the core rod 3 has a hollow lower punch 18 as shown in FIG.
8 is provided and an upper punch (not shown) is provided with a hole into which the upper end of the core rod is inserted. Generally, a die 12, a table 17, a lower punch 18, and a partition member 2 of a feeder 26 for each shape of the green compact.
5, 26 and the upper punch 33 are to be replaced.

[0009]

As described above, according to the present invention, the upper surfaces of the die 12 and the table 17 are not horizontal planes but the feeder 2
Since it has an appropriate shape based on the shape of the green compact in the direction orthogonal to the movement direction of 3, the effect that even a green compact having an uneven surface or an inclined surface can be molded to a uniform density with an extremely simple structure Have

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing a main part of an embodiment of the present invention.

FIG. 2 is a front view thereof.

3 is a sectional view taken along line AA in FIG.

FIG. 4 is a vertical cross-sectional view showing a state of being filled with powder.

FIG. 5 is a vertical cross-sectional view showing a molded state.

FIG. 6 is a vertical sectional view showing a state where a green compact is taken out.

FIG. 7 is a front view showing an example of a green compact.

FIG. 8 is a side view thereof.

FIG. 9 is a plan view showing another green compact.

FIG. 10 is a front view thereof.

FIG. 11 is a plan view showing another different powder compact.

FIG. 12 is a front view thereof.

FIG. 13 is a vertical cross-sectional view showing the main parts of the apparatus for molding the green compact shown in FIGS.

[Explanation of symbols]

 12 dies 16 holes 17 table 18 lower punch 23 feeder 25 partition member 26 partition member 28 inclined portion 30 groove 31 inclined portion 32 protruding portion 33 upper punch 90 powder 91 powder compact 92 powder compact 93 powder compact

Claims (1)

[Scope of utility model registration request] 1. A lower punch that can be moved up and down, a die having a hole that allows the lower punch to penetrate therethrough and accommodates powder when the lower punch descends, a table surrounding the periphery of the die, and the die. A feeder that reciprocates in a predetermined direction along the upper surface of the table to supply powder into the hole of the die, and a feeder that can be moved up and down and is inserted from above into the hole of the die to compress the powder in cooperation with the lower punch. in and having an upper punch to be compact, the upper surface of the die and the table is the desired cross-sectional shape having an inclined portion to rise in Oite one side in the moving direction perpendicular to the direction of Fuida, Further, the powder molding apparatus is characterized in that the feeder has a shape such that a portion traversing the moving direction is along the upper surfaces of the die and the table.