JPH0320071Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a powder compacting device with a horizontal punch that compresses powder into a compact and then processes the side surface of the compacted compact using a horizontal punch.

[Prior Art] Conventionally, when processing the side surface of a green compact obtained by compression molding powder, compression molding into the green compact and processing of the side surface have been performed in separate steps using separate devices. However, green compacts have weak bonding strength between powder particles and are brittle, resulting in poor machinability, and special conditions and equipment are required to process the specified side surfaces. Efficiency was also poor.

In order to deal with this problem, the present applicant has previously proposed a method in which powder is compression-molded in a mold and the molded green compact is side-processed in the mold (Japanese Patent Application No. 1987- No. 25439). That is, as shown in FIGS. 1A to 1D, raw material powder 2 is filled into a mold 1, and a green compact 5 is filled with a lower punch 3 and an upper punch 4.
In this method, the side surface of the green compact 5 is processed by a horizontal punch 6 in the mold 1 after compression molding. This method has made it possible to improve machinability, etc. in side processing of the green compact 5, simplify equipment, and improve work efficiency.

[Problem to be solved by the invention] However, in this method, when filling the raw material powder 2, the horizontal punch 6 and the horizontal punch guide hole 7 are
The raw material powder 2 enters the space formed by the sliding surfaces 8 of the upper and lower punches 3 and 4, and the horizontal punch 6
During processing, the horizontal punch 6 is obstructed, and there is a risk that powder clogging may occur, in which a predetermined forming surface in accordance with the shape of the horizontal punch 6 cannot be obtained on the green compact 5.

Focusing on the above problem, this invention has developed a powder forming machine with a horizontal punch that can remove the raw material powder that has entered the space of the horizontal punch guide hole and form and process the side surface of the green compact into a predetermined shape. The purpose is to provide equipment.

[Problems to be Solved by the Invention] The powder compacting device with a horizontal punch according to the present invention, which meets this purpose, transfers the raw material powder filled between the die and the core to the upper punch, which is slidably held by the die. and a lower punch to form a green compact, and the side surface of the green compact can be moved back and forth in the lateral direction at a position different from the green compact forming position in the moving direction of the upper punch and the lower punch. A powder compacting device with a horizontal punch that processes a powder using a horizontal punch provided therein, wherein a space is formed in the die by enclosing at least a tip of the horizontal punch when the horizontal punch is retracted and a horizontal punch guide hole of the die. an air passage for supplying air to the upper punch, a die, and a core, and a discharge passage for discharging the air supplied to the space of at least one of the upper punch, the die, and the core.

[Function] In such a device, among the raw material powder filled between the die and the core, the raw powder that has entered the space of the horizontal punch guide hole is sent into the space from the air passage provided in the die. It is blown away by the air generated and discharged to the outside through the discharge passage. Therefore, when processing the side surface of the green compact compacted by the upper and lower punches by moving the horizontal punch forward, the raw material powder has already been removed from the horizontal punch guide hole, so powder clogging is prevented. Then, the horizontal punch is moved forward without any obstruction, and the side surface of the green compact is formed and processed into a predetermined shape.

[Embodiments] Hereinafter, preferred embodiments of the powder compacting apparatus with horizontal punches of the present invention will be described with reference to the drawings.

FIGS. 2A to 2E show a powder compacting apparatus for carrying out the method according to the first embodiment of the present invention in the order of steps, and FIGS. 2F and 2G show FIGS.
It is a top view corresponding to C.

Reference numeral 10 indicates a die as a mold, and the die 10 is assembled into a die holder 11. A lower punch 12 and an upper punch 13 are fitted into the die 10 so as to be slidable in the vertical direction. The lower punch 12 and the upper punch 13 are configured in a cylindrical shape, and a cylindrical core 15 having a discharge passage 14 is fitted into the inner peripheral surface of the upper and lower punches 12 and 13 so as to be slidable in the vertical direction. are combined. The die 10, die holder 11, and core 15 can be moved up and down relative to the lower punch 12 by suitable means not shown. Also, upper punch 1
3 is moved up and down by an appropriate means (not shown), and can apply an appropriate pressing force from above to below.

The die 10 and the die holder 11 are provided with a lateral punch guide hole 16 that passes through them in the lateral direction. A lateral punch 17 is inserted into the lateral punch guide hole 16 so as to be movable laterally along the lateral punch guide hole 16. The tip of the horizontal punch 17 on the sliding surface 18 side of the upper and lower punches 12 and 13 of the die 10 is formed into a stepped shape, and the tip is configured as a cylindrical punch portion 19. A horizontal pressurizing force applying means (not shown) is connected to the horizontal punch 17, and the horizontal punch 17 is advanced with a pressurizing force necessary for punching a powder compact, which will be described later. Note that the core 15 is provided with a hole 20 corresponding to the punch portion 19.

When the horizontal punch 17 is at the retreating end, that is, in the states shown in FIGS. and horizontal punch guide hole 1
A space portion 22 surrounded by 6 and 6 is formed.
This space 22 is communicated with an air passage 23 that sends air supplied from a suitable air supply means (not shown) to the space 22. Air passage 2
3 is bored so as to extend from the die 10 to the die holder 11, and its downstream end is connected to the space 22. The connection position between the space 22 and the air passage 23 is preferably the space 22 closest to the horizontal punch 17. Further, the passage direction at the connection position of the air passage 23 with the space 22 is the sliding surface 1 of the die 10.
It is desirable that it faces towards the 8th side.

A hole 24 serving as a discharge passage is formed in the upper punch 13 on the side surface that will be located at the horizontal punch guide hole 16 when the upper punch 13 is processed for compression molding. The hole 24 is formed to be slightly larger than the horizontal punch guide hole 16, so that even if the position of the upper punch 13 when lowering varies slightly due to different compression molding allowances, the position can match the horizontal punch guide hole 16. It's getting old.

The operation of the powder compacting device with a horizontal punch having such a configuration will be explained below.

First, as shown in FIG. 2A, the raw material powder 25
is filled in the space surrounded by the die 10, the lower punch 12, and the core 15. At this time, a part of the raw material powder 25 enters a space 22 surrounded by the sliding surface 18 of the die 10, the lateral punch guide hole 16, and the tip 21 of the lateral punch 17. In particular, when the surface of the horizontal punch 17 is uneven, a space 22 is inevitably formed, and the raw material powder 25 easily enters.

Next, as shown in FIGS. 2B and 2F, the die 10 is raised by the underfill. Dice 1
0 rises, the upper surface of the raw material powder 25 on the lower punch 12 is lowered relative to the horizontal punch guide hole 16.

Next, as shown in FIGS. 2C and 2G, the upper punch 13 is lowered, and the raw material powder 25 is compression-molded into a green compact 26. When the upper punch 13 descends, the air trapped in the die 10 due to the insertion of the upper punch 13 escapes from the gap between the upper punch 13 and the die 10, and at this time, the raw material powder 25 flies up with the air flow. The raw material powder 25 further enters the horizontal punch guide hole 16. Therefore, compression molding into the green compact 26 is performed with the raw material powder 25 that entered the space 22 during the initial filling of the raw material and the raw material powder 25 that flew up and entered the space 22.

However, in the present invention, the upper punch 1 during compression molding
When the hole 24 of No. 3 comes to the position where it matches the horizontal punch guide hole 16 and the hole 20 of the core 15, air is supplied from the air passage 23 to the space 22 formed by the horizontal punch guide hole 16 and the like. . Space part 2
When air is blown into the core 15 , the raw material powder 25 present in the space 22 is blown away, and the blown raw material powder 25 is discharged to the outside from the discharge passage 14 of the core 15 .

After the raw material powder 25 is removed from the space 22,
As shown in FIG. 2D, the die 10 and core 15 are lowered to move the green compact 26 to the position of the horizontal punch guide hole 16, and the horizontal punch 17 is advanced to move the green compact 26 into the horizontal punch 17. The punch portion 19 punches out the punched piece 27, and the punched piece 27 is discharged into the discharge passage 14 of the core 15.

After the side surface is processed and shaped by the horizontal punch 17, as shown in FIG. The molding is completed.

In this way, when processing and forming the side surface of the green compact 26, the horizontal punch guide hole 16 is already filled with air.
Since the raw material powder 25 is blown away and removed from the space 22 of the space 22, and since this air blowing is performed after the powder is blown up during the compression molding process, the raw material powder 2 in the space 22 is
5 will be reliably discharged in its entirety, there will be no obstruction between the horizontal punch 17 and the powder compact 26, the horizontal punch 17 will be moved forward smoothly, and the side surface of the powder compact 26 will be removed. Processing and molding into a predetermined shape can be performed reliably.

Next, FIGS. 3A and 3B show a powder compacting device with a horizontal punch according to a second embodiment of the present invention, and FIGS.
The process corresponding to G is shown.

In this embodiment, the space 22 includes the space 22
An air passage 30 that supplies air to the space 22 communicates with an air passage 31 that discharges air from the space 22. Further, the upper punch 32 does not have a hole 24 formed therein, unlike the case of the first embodiment. In such a device, the raw material powder 25 in the space 22
is blown away by the air sent from the air passage 30 formed in the die 10, and the blown raw material powder 25 is blown off the die 10 together with the air.
It is discharged and removed through a discharge passage 31 formed in the. That is, the powder is removed only in the die 10 without passing air into the core 15, and by doing so, the compression molding process, processing molding process (Fig. 2C, D) Since air can be flowed even when the powder is removed (equivalent to 100%), the powder removal time can be extended, making it possible to remove the powder more reliably.

Next, FIGS. 4A, B, and C show a powder compacting apparatus with a horizontal punch according to a third embodiment of the present invention, and show steps corresponding to FIGS. 2C and G.

In this embodiment, a groove 40 as an air passage is provided on the inner peripheral surface of the horizontal punch guide hole 16 of the die 10.
is provided. Air sent by the passage 41 of the die holder 11 is supplied to the space 22 through the groove 40. In such a device, air is passed through the sliding surface of the horizontal punch 17, and powder is removed from the sliding surface together with the space 22, so that galling of the horizontal punch 17 is prevented and the horizontal punch 17 is smooth. operation is further ensured.

[Effect of the invention] As explained above, when using the powder compacting device with a horizontal punch according to the present invention, air from the air passage provided in the die is supplied to the space of the horizontal punch guide hole into which the raw material powder enters. I decided to do this, so
The raw material powder that has entered the horizontal punch guide hole can be blown away by air, and the blown raw material powder can be discharged to the outside via the discharge passage. Therefore, the problem of powder clogging during processing using a horizontal punch can be solved, and the side surface forming and processing of the green compact into a predetermined shape can be performed reliably.

In addition, since the powder that has entered the guide hole of the horizontal punch is removed before side forming, there is no problem even if the raw powder enters the guide part of the horizontal punch when filling the raw material powder, and the horizontal punch It is possible to form the side surface of a green compact when the surface is uneven.

Furthermore, by configuring the air passage provided in the die with a plurality of grooves extending along the horizontal punch guide hole, air can be supplied through the plurality of grooves, and the material can be reliably supplied from the sliding surface of the horizontal punch guide hole. Powder can be removed and the lateral punch can also operate more smoothly.

[Brief explanation of the drawing]

Figures 1A, B, C, and D are vertical cross-sectional views of a powder molding device showing the conventional powder molding and horizontal punch processing in the order of steps, and Figures 2A, B, C, D, and E are the A vertical cross-sectional view showing the powder compacting device with a horizontal punch according to an embodiment in the order of steps, FIGS. 2F and G are plan views showing a part of FIGS. 2B and C in cross section, and FIG. A vertical sectional view of a powder compacting device with a horizontal punch according to a second embodiment of the invention, FIG. 3B is a plan view showing a part of FIG. 3A in cross section, and FIG. A vertical sectional view of a powder compacting device with a horizontal punch according to an embodiment, FIG. 4B is a plan view showing a part of FIG. 4A in cross section, and FIG. FIG. 10...Dice, 12...Down punch, 13...
Upper punch, 14, 24, 31...Discharge passage, 15
...Core, 16...Horizontal punch guide hole, 17...
Horizontal punch, 22... Space part, 23, 30, 40...
...Air passage, 25...Raw material powder, 26...Powder compact.

Claims (1)

[Claims for Utility Model Registration] (1) Raw material powder filled between a die and a core is compressed into a compact by an upper punch and a lower punch that are slidably held by the die. ,
A powder compacting device with a horizontal punch that processes the side surface of the powder compact with a horizontal punch that is provided so as to be movable in the horizontal direction at a position different from the powder compact compacting position in the moving direction of the upper punch and the lower punch. The die is provided with an air passage for supplying air to at least a space formed by surrounding the tip of the horizontal punch during retraction and the horizontal punch guide hole of the die, and the upper punch and 1. A powder compacting device with a horizontal punch, characterized in that at least one of the die and the core is provided with a discharge passage for discharging the air supplied to the space. (2) The powder molding device with a horizontal punch according to claim 1, wherein the air passage provided in the die is constituted by a plurality of grooves extending along the inner peripheral surface of the horizontal punch guide hole. .