JPS6324099Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a powder molding apparatus having a mechanism for ejecting a compression-molded compact from a mold using a powder supply powder box.

[Prior art] Conventionally, the molded product extracted from the mold was discharged by
This is done by extruding the molded body through a powder supply powder box that supplies raw material powder for the next molding into a mold. The operation of the powder supply powder box is controlled so that the front surface of the powder supply powder box contacts the compact at the same time as the compact is removed.

For example, as shown in FIG.
When the operation of the compression-molded compact 2 is controlled by a cam provided in a press (not shown),
is maintained in contact with the upper punch 3 until it is completely extracted from the mold 3 in order to ensure the quality of the molded product. When the compact 2 is completely extracted from the mold 4 and the upper punch 3 is released, the discharge fork 5 on the front surface of the powder supply powder box 1 comes into contact with the compact 2, and the powder supply powder box 1 is removed.
The molded body 2 is fed out as the molded body 2 moves forward.

However, when forming compacts with different thicknesses, radii, etc., the timing at which the powder supply powder box 1 hits the compact 2 is delayed, so the discharge fork of the powder supply powder box 1 is removed before the compact 2 is sufficiently extracted. 5 collides with the molded body 2, resulting in damage to the discharge fork 5 or damage to the molded body 2.

In addition, if the powder supply box 1 is adjusted to the front position to prevent collision as shown in FIG. The molded product 2 falls into the powder filling area formed by the mold 4 and the lower punch 6 faster than the supply powder box 1 extrudes the molded product 2, causing problems such as making continuous molding impossible.

In order to eliminate these problems, it is necessary to replace the operating cam for the powder box for each product, and change the operating form of the powder feeding powder box from a mechanical one to a flexible one that can be electrically controlled using hydraulic pressure. There are ways to type it. However, replacing the powder box operating cam for each product has a negative impact on equipment utilization. Furthermore, electrically controlling the operation of the powder supply powder box using hydraulic pressure has problems such as slowing down the molding cycle, and neither method is suitable for mass production. Therefore, there is a need for a powder compacting device that is versatile and capable of maintaining and improving productivity.

[Problems to be solved by the invention] The technical problem of the invention is to satisfy the above-mentioned demands, and even if the timing at which the powder supply box extrudes the molded product is out of alignment, the invention absorbs the timing deviation. It is an object of the present invention to provide a powder compacting device capable of instantaneously discharging a compact.

[Means for Solving the Problems] In order to achieve this object, in the powder molding apparatus of the present invention, powder is compression-molded in a mold by a lower punch and an upper punch, and The molded product that has been pulled out by being held between the upper punch and the lower punch until the upper punch leaves the mold is fed out by the front surface of the powder supply powder box that advances the upper surface of the mold toward the molded product, and the molded product Raw material powder is supplied into the mold. The front side of the powder supply powder box is equipped with a biasing force generated by the bending of the molded body, and this biasing force allows the molded body released by the upper punch to be pushed out in the direction along the upper surface of the mold. An elastic body is attached.

[Function] In the powder compacting device configured as described above, while the upper punch is in contact with the compact, the elastic body comes into contact with the compact and is bent to bias the compact from the side. . Therefore, the moment the upper punch leaves the molded body is repelled by the elastic force of the elastic body.
The molded body is instantly discharged in the direction along the upper surface of the mold.

Further, even if the timing at which the elastic body contacts the molded body is shifted when the thicknesses and diameters of the molded bodies are different, the timing shift is easily absorbed by the deflection of the elastic body. Therefore, even if the thickness, diameter, etc. of the compacts differ, there is no need to replace the operating cams, etc. as in the past, and a versatile powder compacting device with a simple structure can be obtained.

In addition, since the ejection of the molded body is instantaneously performed by the elastic body, it is possible to discharge the molded body and supply the powder into the mold quickly and continuously.
In fact, the molding cycle is improved, and productivity can also be improved.

[Embodiments] Preferred embodiments of the present invention will be described below with reference to the drawings.

4 to 7 show a powder compacting apparatus according to an embodiment of the present invention. In the figure, a die 11 as a mold is fixed to a die holder 10, and an upper punch 12 and a lower punch 13 are fitted into the die 11 so as to be slidable in the vertical direction.
The upper punch 12 and the lower punch 13 have a cylindrical shape, and a core rod 14 for making the molded product into a cylindrical shape is fitted on the inner peripheral side of each so as to be slidable in the vertical direction. The die 11, the die holder 10, and the core rod 14 can be moved up and down relative to the lower punch 13 by suitable means (not shown). Further, the upper punch 12 is fixed to the upper press unevenness 15 and can be moved up and down by an appropriate means (not shown), and can apply an appropriate pressing force from above to below.

A powder supply powder box 16 is disposed on the upper surface of the die holder 10, and the upper surfaces of the die holder 10 and the die 11 serve as sliding surfaces of the powder supply powder box 16.

The bottom of the powder supply box 16 is open, the opening is sealed by a sliding surface, and the inside is filled with raw material powder. The powder supply powder box 16 slides on the sliding surface to a powder filling part 17 formed by the die 11 and the lower punch 13, and drops raw powder into the powder filling part 17 from the opening.

The powder supply powder box 16 is configured to advance toward the molded product side in response to the extraction stroke in which the compression-molded molded product 18 is extracted from the die 11 by a cam provided on the press body (not shown). .

Furthermore, a spring 19 as an elastic body extending forward is attached to the front surface of the powder supply powder box 16. Although a coil spring is used as the spring 19 in this embodiment, it is made of a hollow ring of urethane rubber, sponge, etc., which does not cause cracking or chipping even when compressive force is applied to the molded body 18, and has an instantaneous force when unloading. It is fine as long as it can be secured.

The timing at which the powder supply powder box 16 comes into contact with the compact 18 is adjusted so that when the compact 18 is extracted from the die 11, the spring 19 biases the compact 18 in a bent state. There is.

Next, the operation of the powder compacting apparatus configured as described above will be explained.

The compact 18 compressed in the die 11 by the upper punch 12 and the lower punch 13 is extracted from the die 11 as shown in FIG. Correspondingly, it advances towards the molded body 18.
When the compact 18 is further advanced and is completely extracted to the upper surface of the die 11 while in contact with the upper punch 12, the powder supply powder box 16 is sufficiently close to the compact 18 as shown in FIG. There is. Spring 19
is compressed and bent by contacting the side surface of the molded body 18, and urges the side surface of the molded body 18. At this time, the deviation in the timing of the powder supply powder box 16 coming into contact with the compact 18 due to differences in the diameter, thickness, etc. of the compacts is absorbed by the amount of deflection of the spring 19. Furthermore, as shown in FIG.
more excreted. For example, the weight of the molded body 18 is
When using a spring 19 with a deflection of 7 mm and an elastic force of 1.8 for a 500 g object, the molded object will be
It is discharged 15 to 20 mm forward and does not fall into the powder filling section 17.

After the compact 18 is discharged, as shown in FIG.
Powder filling is completed while ensuring the required depth, and continuous molding is performed in the next process.

[Effect of the invention] As is clear from the above explanation, when the powder compacting apparatus of the present invention is used, the side surface of the compact is biased against the front surface of the powder supply powder box 16 by the biasing force generated by its own deflection. Since an elastic body is provided that can push out the molded body from which the upper punch has been separated by force in the direction along the upper surface of the mold, even if the timing at which the powder supply powder box 16 contacts the molded body 18 is shifted, the elastic body Misalignment can be easily absorbed by bending, and molded objects of different radius, thickness, etc. can be used as is without the need to replace parts, realizing a versatile device despite its simple structure. can. Furthermore, since the molded body 18 can be ejected instantaneously by the elastic force of the elastic body, the molding cycle does not slow down, and in fact, it is possible to improve the cycle, thereby improving productivity. becomes possible.

[Brief explanation of the drawing]

Fig. 1 is a side view of a conventional powder compacting device, Fig. 2 is a side view showing a state in which the timing of the powder supply box of the device in Fig. 1 in contact with the compact is delayed, and Fig. 3 is the same as in Fig. 1. FIG. 4 is a sectional view of the powder compacting device according to an embodiment of the present invention, and FIG. 5 is a side view showing the compacted product of the device shown in FIG. Fig. 6 is a side view showing a state in which the abutted spring is bent, Fig. 6 is a side view showing the molded body of the device in Fig. 4 in a repelled state, and Fig. 7 is a side view showing the powder filling part of the device in Fig. 4. FIG. 3 is a cross-sectional view showing a state filled with raw material powder. 10...Die holder, 11...Dice, 12...
... Upper punch, 13 ... Lower punch, 16 ... Powder supply powder box, 17 ... Powder filling box, 18 ... Molded object,
19...Spring.

Claims (1)

[Scope of utility model registration request] The molded body is formed by compression molding the raw material powder filled in the mold using an upper punch and a lower punch.
The front surface of a powder supply powder box that is pulled out from inside the mold by being held by an upper punch and a lower punch to a position on the upper surface of the mold, and then the upper punch is released and the molded product is advanced toward the molded product on the upper surface of the mold. In addition to sending out by
In the powder molding device that supplies the raw material powder in the powder supply box into the mold, on the front surface of the powder supply box,
The side surface of the molded product that has been pulled out to the top surface of the mold is biased by a biasing force due to its own deflection, and the molded product from which the upper punch has been released can be pushed out in a direction along the top surface of the mold by the biasing force. A powder compacting device characterized by being provided with an elastic body.