JPH0344395Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention is a powder press for injecting metal powder into the die of a mold used when press-molding metal powder in the process of manufacturing sintered parts. This relates to the structure of the shoe.

(Prior art) In the process of manufacturing sintered parts, when metal powder for pressure forming is put into a die as disclosed in Japanese Utility Model Application Publication No. 59-39096, the powder is Die 2 in press mold 1
By reciprocating the shoe body 7, which has a downward supply opening 9 on the upper surface and is configured to accommodate the metal powder M, on the upper surface of the die 2, the metal powder M in the shoe body 7 is transferred to the die. It will be put into 2. The shoe body 7 that has been used conventionally is designed to prevent the metal powder M inside from leaking to the peripheral edge 10 of the supply opening 9, which is the sliding surface between the shoe body 7 and the die 2. For this reason, there is a device in which a sealing member 13 is attached to the entire surface. In Fig. 6, numeral 3 is a die holder, 4 and 5 are lower punches, 6 is a core rod,
8 is a guide plate.

(Problems to be Solved by the Invention) When the powder press shoe disclosed in the above-mentioned prior art is used, the flushness between the sealing member 13 and the die 2 may be impaired for some reason, and the shoe body During the reciprocating movement of the shoe body 7, the metal powder M inside the shoe body 7 may leak outward, but once there is no means to collect the leaked metal powder M, There has been a problem in that the particles adhere to the pressure-molded product, resulting in a deterioration in the quality of the product.

This invention was made in view of the above points,
It is an object of the present invention to provide a shoe structure configured to prevent leakage of metal powder from a shoe body as much as possible.

(Means for Solving the Problems) In the present invention, as a means for solving the above problems, in a shoe body having a supply opening on the lower surface for supplying metal powder to a powder press die, the periphery of the supply opening A powder collecting space that opens downward is formed at least on the front side in the forward direction of the shoe main body in the part, and a hard sealing member made of a hard material and a soft material are provided on the inner and outer peripheral sides of the powder collecting space. A soft seal member is provided respectively.

(Function) In the present invention, the following effects can be obtained by the above means.

That is, when the shoe body slides back and forth on the die during pressure molding of metal powder, the flatness of the shoe body and the die surface is ensured by the hard sealing member on the inner peripheral side of the powder reservoir cavity. , it is possible to reliably prevent the metal powder inside the shoe body from leaking out. As the shoe body repeatedly slides back and forth, a small amount of metal powder may leak from the hard seal member on the inner circumference of the powder reservoir cavity, but the leaked metal powder is The powder is captured and stored in the powder reservoir space sealed by the sealing member, and leakage of the powder to the outside of the shoe body can be prevented as much as possible. Therefore, no metal powder is left on the upper surface of the die where the product (ie, the pressure-molded body) is taken out, and adhesion of the metal powder to the product is prevented.

(Embodiments) Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

A first embodiment of the invention is shown in FIGS. 1-3.

Show body 7 of the powder press show of this embodiment
is used to charge metal powder M into die 2 of powder press mold 1 configured to pressure-form metal powder M in the process of manufacturing sintered parts, and is circular. It is composed of an annular frame 10 and a cover 11 that covers the top of the frame 10, and has a downward supply opening 9. That is, the frame 10 constitutes the peripheral edge of the supply opening 9.

This shoe main body 7 is configured to be able to reciprocate and slide on the upper surface of the die 2 by the operation of a drive cylinder 16, and the metal powder M can be supplied into the interior thereof from a powder supply pipe 15. There is.

The mold 1 includes a die 2 supported by a die holder 3, a first lower punch 4 fitted into the die 2 from below, and a first lower punch 4 fitted into the first lower punch 4 from below. a second lower punch 5, and a core rod 6 fitted into the second lower punch 5 from below.
It is equipped with

Therefore, when the shoe body 7 reciprocates on the upper surface of the die 2 as shown by the arrow P in FIG.
A predetermined amount of metal powder M in the shoe body 7 is put into the die 2. Reference numeral 8 denotes a guide plate for guiding the shoe body 7 during backward movement.

As a feature of the present invention, an annular powder reservoir cavity 12 that opens downward is formed on the lower surface of the frame 10 (in other words, the peripheral edge of the supply opening 9). The powder storage space 12 has the function of capturing and storing the metal powder M that tends to leak outward from the shoe body 7.

Furthermore, a hard seal member 13 made of a hard material such as hard plastics and a soft seal member 14 made of a soft material such as rubber are attached to the inner and outer circumferential sides of the powder reservoir cavity 12.
The hard sealing member 13 has the function of ensuring flatness between the sliding surfaces with the upper surface of the die 2 and reliably preventing leakage of the metal powder M inside, while the soft sealing member 14 , acts to capture and store the metal powder M leaking from the hard seal member 13 in the powder reservoir cavity 12. That is, the hard seal member 13 is hard enough not to deform even when a pressing force is applied, while the soft seal member 14 is hard enough to deform slightly when a pressing force is applied. By doing so, it is possible to ensure the coherency of the two and to obtain reliable sealing performance.The thickness of both is 1 to 5 mm. desirable.

The powder press shoe having the above structure operates as follows.

As shown by the chain line in FIG. 1, the shoe body 7, which is in a standby state on the guide plate 8, is advanced toward the upper surface of the die 2 by the operation of the drive cylinder 16 (shown by the solid line in FIG. 1). Then, the metal powder M in the shoe body 7 is thrown into the die 2 by gravity. After that, when the shoe body 7 is moved backward by the drive cylinder 16, the shoe body 7 is moved back with the remaining metal powder M that has been put into the die 2 in a predetermined amount.
is positioned on the guide plate 8. In this way, the operation of charging the metal powder M into the die 2 is completed. Thereafter, an upper punch (not shown) is fitted onto the die 2 from above to produce a pressure-molded body. When the pressure-molded body is taken out of the die 2, the drive cylinder 16 moves the shoe body 7 forward again to push the pressure-molded body out of the mold 1 and at the same time introduce the metal powder M into the die 2. Do it.

During the above operation, the metal powder M in the shoe main body 7 is prevented from leaking by ensuring flatness by the hard seal member 13 provided on the inner peripheral side of the frame 10 which is the peripheral edge of the supply opening 9. be done. Further, when the above operation is repeated, a small amount of metal powder M may leak out from the hard seal member 13, but this leaked metal powder M is transferred to the powder reservoir cavity located outside the hard seal member 13. 12 and a soft sealing member 1 outside the powder sump cavity 12
4 prevents powder from leaking outside the shoe main body 7. Therefore, the metal powder M is no longer left around the die 2 of the mold 1, and the product (i.e.
This prevents the metal powder M from adhering to the pressure-molded product.

Note that in order to prevent the remaining metal powder M from adhering to the product, it is not necessary to form the powder storage space 12 on the entire peripheral edge of the supply opening 9, but rather at a position ( In the case of this embodiment, the powder storage space 12 may be formed in the front half, and a hard seal member 13 and a soft seal member 14 may be provided on the inner and outer peripheral sides thereof, respectively. In that case, a conventionally used sealing member may be provided in the rear half.

However, in order to prevent the metal powder M from remaining on the upper surface of the die 2, it is desirable to provide the powder reservoir space 12 and the seal members 13, 14 all around the frame 10 as in the illustrated embodiment.

FIG. 4 shows a second embodiment of the invention. In this case, hard and soft sealing members 1 provided on the inner and outer circumferential sides of the powder reservoir cavity 12
3 and 14 are annular grooves 1 formed on the lower surface of the frame 10;
7 and 18. The other configurations and operations are the same as those of the first embodiment, so their explanation will be omitted.

FIG. 5 shows a third embodiment of the invention. In this case, the frame 10 of the shoe body 7 has a rectangular ring shape. Other configurations and effects are as follows:
Since this is the same as the first embodiment, the explanation will be omitted.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and it goes without saying that the design can be changed as appropriate without departing from the gist of the invention.

(Effect of the invention) As described above, according to the invention, a powder reservoir cavity that opens downward is formed at least on the front side in the forward direction of the shoe main body at the peripheral edge of the supply opening in the shoe main body, and Since a hard sealing member made of a hard material and a soft sealing member made of a soft material are provided on the inner and outer circumferential sides of the reservoir cavity, during pressure molding of metal powder,
When the shoe body slides back and forth on the die, the flatness of the shoe body and the die surface is ensured by the hard sealing member on the inner peripheral side of the powder reservoir cavity.
It is possible to reliably prevent the metal powder inside the shoe body from leaking out, and while the shoe body is repeatedly sliding back and forth, a small amount of metal powder leaks from the hard sealing member on the inner circumferential side of the powder reservoir cavity. Even if the metal powder leaks out, the leaked metal powder will be captured and stored in the powder reservoir cavity whose outer periphery is sealed with a soft sealing member, thereby preventing powder leakage to the outside of the shoe body as much as possible. I can do it. Therefore, no metal powder is left on the upper surface of the die where the product (i.e., the pressure-molded body) is taken out, and it is possible to prevent quality deterioration due to metal powder adhesion to the product. It has a positive effect.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing a powder press shoe structure according to a first embodiment of the present invention, and FIG.
FIG. 3 is a reduced bottom view of the shoe main body in FIG. 2, and FIG. 4 is a cross-sectional view showing essential parts of the shoe main body according to the second embodiment of the present invention. 5 is a bottom view of a shoe main body according to a third embodiment of the present invention, and FIG. 6 is a sectional view showing a conventionally known shoe structure for a powder press. 2...Dice, 7...Shu body, 9...Supply opening, 10...Peripheral portion (frame body), 12...Powder reservoir space, 13...Hard seal member, 14...Soft seal member, M ...Metal powder.

Claims (1)

[Scope of utility model registration request] In a shoe body having a supply opening on the lower surface for supplying metal powder to a powder press die, a powder reservoir cavity is formed at a peripheral edge of the supply opening and opens downwardly at least to the front side in the forward direction of the shoe body, A shoe structure for a powder press, characterized in that a hard seal member made of a hard material and a soft seal member made of a soft material are provided on the inner and outer circumferential sides of the powder reservoir cavity, respectively.