JPH06238497A - Dry process cold isotropic pressure molding method - Google Patents

Abstract

PURPOSE:To improve productivity by easy and sure tapping in dry process cold hydrostatic pressure molding and to reduce a space and consequently a cost. CONSTITUTION:A rubber mold 7 for molding is placed on a lower cap 5 and a lower punch 11 outside a molding container 1 in the dry process cold isotropic pressure molding method and in this state, a powder material M is packed and tapped. The lower cap 5 and the lower punch 11 are risen after the packing of the powder material M and the rubber mold 7 for molding is inserted into the molding container 1 where the pressure molding is executed. Only the molded article P is taken out together with the lower punch 11 after the pressure molding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dry cold isostatic pressing method for press-molding a powder material filled in a molding rubber mold with isotropic pressure.

[0002]

2. Description of the Related Art Generally, a dry cold isostatic pressing method includes an in-line method in which a powder material is filled in a molding rubber mold with the molding rubber mold being inserted into a molding container, and a molding rubber mold. It is classified into two types: an off-line method in which a powder material is taken out from a molding container and filled in a molding rubber mold.

First of all, the in-line method is, for example, the actual development method.
There is a method using an apparatus described in Japanese Patent No. 63-25294.
This will be described below with reference to FIG. With this device,
Inside the cylindrical molding container 31, a pressure rubber mold 35 and a molding rubber mold 32.
An upper lid 33 and a lower lid 34 are openably and closably provided at the upper and lower openings of the molding container 31. The upper lid 33 is the upper outer lid 33
The lower lid 34 is composed of a lower outer lid 34A and a lower punch 34B.

The process of filling the powder material is performed as follows. With the upper punch 33B of the upper lid 33 raised and retracted, a certain amount of powder material is supplied to the molding rubber die 32. That is, the powder material is filled with the molded rubber die 32 being inserted into the molded container 31. Also, the molded body P after pressure molding
The process of taking out is carried out as follows. After the pressure molding is completed, the lower punch 34B of the lower lid 34 is lowered and retracted, and the molded body P is taken out from the lower portion of the molding container 31. That is, the molded body P is taken out while the molded rubber die 32 is still fitted inside the molded container 31.

On the other hand, the off-line system is, for example,
There is a method using an apparatus described in Japanese Patent Publication No. 61-205694.
This will be described below with reference to FIG. In this device, a turntable 40 rotatably installed around a vertical axis and a pressure molding station 41 are separately arranged,
A delivery station 4 for separating the pressure molding station 41 side and the molding rubber mold 46 on the 40 in the circumferential direction.
4, stand-by station 43, molded product take-out station 4
5 and a powder feeding station 42 are sequentially provided and configured. Then, the molded rubber mold 46 held by the holding device 49 is conveyed between the stations by the rotation of the turntable 40 together with the lower inner lid 48, and undergoes a predetermined process.

Among the steps, the step of filling the powder material is performed as follows. The molding rubber mold 46 is conveyed to the powder feeding station 42 by the rotation of the turntable 40, and a predetermined amount of powder material is supplied from the raw material hopper 51 via the powder quantitative supply device 50, and the rubber mold striking device is also provided.
Tapping is performed by 52 or the like to improve the packing density of the powder material.

The process of taking out the molded body P after pressure molding is performed as follows. The molded body P is taken out from the molding container 47 together with the molding rubber mold 46, and transferred from the pressure molding station 41 to the transfer station 44. After that, the turntable 40 is rotated to be conveyed to the molded body take-out station 45, and the rubber mold attaching / detaching device 53 removes the molded rubber mold 46 from the lower inner lid 48 to mold the molded body P on the lower inner lid 48. Body transport manipulator
It is placed on the conveyor 55 by 54 and conveyed to a predetermined position.

[0008]

According to the conventional in-line method, since it is not necessary to attach / detach the molding rubber mold to / from the molding container, an auxiliary device is not required and the installation space is small, and the cost can be reduced. Can be achieved. But,
The filling of the powder material is also performed while the molding rubber mold is still fitted in the molding container, so that tapping cannot be performed and it is impossible to increase the packing density of the powder material.

Therefore, in the method using the apparatus described in Japanese Utility Model Laid-Open No. 63-25294, the pressure rubber mold 35 is used.
Is held by a dummy cylinder 36 made of an electromagnetic coil, and a striker 38 made of a permanent magnet is movably provided in a gap 37 between the pressure rubber mold 35 and the dummy cylinder 36. Then, by energizing the dummy cylinder 36 alternately in the forward and reverse directions, the striker 38
To move and tap with it.

However, in the above-mentioned tapping means, the behavior of the striker 38 is unstable, uniform tapping cannot be expected, and the problems of the conventional in-line system have not been completely solved. Further, since the tapping means is provided, it is necessary to increase the inner diameter of the molding container 31 and the apparatus becomes large in size, and since the parts constituting the tapping means are expensive, the cost is high, that is, the conventional in-line method. There was also the problem of losing the advantages of.

In the off-line method described in Japanese Utility Model Laid-Open No. 61-205694, the powder material is filled outside the molding container, so that the tapping means can be easily installed and reliable tapping can be performed. However, since each process other than pressure molding is performed by taking out the molded rubber mold from the molding container in different places, the number of auxiliary devices increases, the entire device becomes larger, and the installation space also increases. There was a problem of becoming.

The present invention has been made in view of the above situation, and an object of the present invention is to provide a dry cold isostatic pressing method which has the advantages of the conventional in-line method and offline method. A dry cold isotropic pressure molding method that can improve productivity by enabling easy and reliable tapping, further reduce the installation space of the device, and thereby reduce the cost. To provide.

[0013]

In order to achieve the above object, the present invention takes the following technical means. That is, a cylindrical molding rubber mold and a pressure rubber mold are inserted into the cylindrical molding container in order from the inside, and the upper and lower open ends of the molding container are closed by the upper and lower lids and the upper and lower punches. By introducing a pressure medium into the gap between the container and the pressure rubber mold, in a dry cold isotropic pressure molding method for isotropically pressure molding the powder material filled in the molding rubber mold, Filling and tapping the powder material with the molding rubber die placed on the lower lid and the lower punch outside the molding container, and after filling the powder material, raise the lower lid and the lower punch to perform the molding. A rubber mold is inserted into the molding container to perform pressure molding, and after the pressure molding, only the molded body is taken out together with the lower punch.

[0014]

According to the present invention, in the dry cold isotropic pressure molding method, the molding rubber mold is taken out from the molding container and the powder material is filled and tapped. Therefore, since an arbitrary tapping means can be easily attached, easy and reliable tapping can be performed during the filling of the powder material, so that the packing density of the powder material can be improved and the productivity can be enhanced.

Further, according to the present invention, only the molded body for which pressure molding has been completed is taken out, and the molding rubber die is not taken out at the same time. Therefore, with respect to taking out the molded body, since an auxiliary device for separating the molded rubber mold and the molded body is unnecessary, the device as a whole can be small, and thus the installation space of the device can be reduced, and The cost can be reduced.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show an example of a molding apparatus for carrying out the method of the present invention. In the figure, reference numeral 1 is a cylindrical molding container which is vertically mounted on a base frame 2 via a support arm 3, and upper and lower lids 4 and 5 are mounted on the upper and lower openings so as to be opened and closed. A cylindrical pressure rubber mold 6 and a molding rubber mold 7 are incorporated in the container 1, and the molding rubber mold 7 can be inserted and removed freely.

At the centers of the upper lid 4 and the lower lid 5, there are provided openings 8 and 9 penetrating in the vertical direction and having the same diameter as the inner diameter of the molding rubber die 7, and the upper and lower punches 10 and 9 are formed in the openings 8 and 9, respectively. 11 is removably inserted, and the inner ends of the upper and lower punches 10, 11 are removably fitted in the upper and lower openings of the molded rubber die 7. The upper and lower punches 10 and 11 are attached to the support arm 3 via lifting and lowering devices 12 and 13 composed of a cylinder mechanism so that they can be individually lifted and lowered. Further, the lower lid 5 can be connected and separated from the lower punch 11 by the clamp means 14 and the molding container 1 by the clamp means 15, respectively.

Between the pressure rubber mold 6 and the molding container 1,
A pressure medium chamber 16 is formed, and a pump (not shown) is provided in the pressure medium chamber 16.
A pressure medium is supplied by such means as to apply isotropic pressure. The axial load acting on the upper and lower lids 4 and 5 and the upper and lower punches 10 and 11 at the time of pressure molding is supported by the press frame 17 which is movable in the lateral direction. The press frame 17 is made to stand by in the lateral direction except during pressure molding so as not to hinder the handling operation.

When pressure molding of powder material is performed in such an apparatus, first, as shown in FIG. 2A, the clamping means 14 is closed and the clamping means 15 is opened, and the press frame 17 is pressed. While retracting to the standby position,
When the lower punch 11 is lowered by the lifting device 13, the lower lid and the molding rubber die 7 are integrally lowered, and at the lower limit, the molding rubber die 7 is completely escaped downward from the molding container 1.

Here, while supplying the powder material M into the molding rubber die 7, the bridge of the powder material M is broken by the tapping means to increase the filling rate. Then, the elevating device 13 raises the molding rubber mold 7 together with the lower punch 11, the molding rubber mold 7 is incorporated into the molding container 1, the clamping means 15 is closed, the molding container 1 and the lower lid 5 are connected, and the clamping means 14 is connected. Open to the state shown in FIG. 2 (b).

At this time, the lower punch 11 is not lowered, but the upper punch 10 is raised by the elevating device 12, and the molding rubber mold 7 is moved.
It is also possible to fill the powder material M into the molding rubber mold 7 through the upper opening 8 of the upper lid 4 in a state where the powder material M is still incorporated in the molding container 1. Next, the press frame 17 is moved to be fitted onto the molding container 1, and in the state shown in FIG. 2 (c), the pressure medium is injected into the pressure medium chamber 16 and isotropically pressurized by the pressure rubber mold 6 And the powder material M is pressed through the molding rubber die 7 to
Pressure molding is performed.

When the pressure molding is completed, the press frame 17
Is moved to the standby position and the lower punch 11 is lowered by the elevating device 13, only the compact P is placed on the lower punch 11 and descends, and the state shown in FIG. Take out. At this time, since the molding rubber die 7 does not descend, the step of separating the molding rubber die 7 and the molded body P becomes unnecessary, and therefore, an extra accessory device is not required.

After the removal of the molded body P from the lower punch 11 is completed, the lower punch 11 is again raised by the elevating device 13 to be fitted into the lower lid 5 and the molding container 1, and the clamping means 14 is closed to close the lower lid. 5 and the lower punch 11 are connected, the clamping means 15 is opened, the molding container 1 and the lower lid 5 are separated, and the lower punch 11 is lowered by the elevating device 13 to shift to the state shown in FIG. 2 (a). Then, the above-mentioned operation is sequentially repeated, and the pressure molding can be continued.

Further, FIG. 3 shows a molding rubber mold in the present invention.
7 is an example of a specific method for filling powder material M by lowering 7 from the molding container 1. In this figure, the lower punch 11 is swung 180 degrees (or an arbitrary angle) about the rod 13A of the elevating device 13 by the swivel drive means 18 in the lower limit of the lower punch 11, and is laterally outward from directly below the molding container 1. It is possible to move to the powder material filling position. Then, at the filling position, the powder material M is supplied by the powder supplying means 19 into the molding rubber die 7 mounted on the lower punch 11 together with the lower lid 5,
The tapping means 20 vibrates the molded rubber mold 7 to break the bridge of powder and increase the filling rate. After that, the lower punch 11 is swung again directly below the original molding container 1 by the swivel driving means 18. The tapping means 20 may have a conventional simple structure, and may be of a movable type or a fixed type. Therefore, it is possible to realize tapping easily and reliably.

The present invention is not limited to the above embodiment, and the design of the pressure molding apparatus can be changed appropriately.

[0026]

The present invention is as described above. According to the present invention, the molding rubber mold is taken out from the molding container and the powder material is filled and tapping is performed. Therefore, tapping can be performed easily and surely. The packing density of the powder material can be improved and the productivity can be increased.

Further, since it is not necessary to separately take out the molded body that has been subjected to pressure molding and to take it out together with the molding rubber mold, the apparatus can be made small, the installation space can be reduced, and the cost can be reduced. it can.

[Brief description of drawings]

FIG. 1 is a central longitudinal sectional view showing an apparatus according to an embodiment of the present invention.

FIG. 2 is a central longitudinal cross-sectional view showing a molding process in the example, (a) is a molding rubber mold removing process, (b) is a molding rubber mold assembling process into a molding container, and (c) is a pressurizing process. Molding process, (d) is a molded product unloading process.

FIG. 3 is a central longitudinal sectional view showing an apparatus according to another embodiment of the present invention.

FIG. 4 is a central vertical cross-sectional view showing an example of a conventional in-line apparatus.

FIG. 5 shows an example of a conventional offline system device (a)
It is a top view and (b) front view.

[Explanation of symbols]

 1 Molding Container 4 Upper Lid 5 Lower Lid 6 Pressure Rubber Mold 7 Molding Rubber Mold 10 Upper Punch 11 Lower Punch 16 Pressure Medium Chamber M Powder Material P Molded Body

Claims (1)

[Claims] 1. A cylindrical molded rubber mold and a pressure rubber mold are inserted into a cylindrical molded container in order from the inside, and the upper and lower open ends of the molded container are closed by an upper and lower lid and an upper and lower punch. ,
A dry cold isotropic pressure molding method in which a powder medium filled in the molding rubber mold is isotropically pressure-molded by introducing a pressure medium into a gap between the molding container and the pressure rubber mold. In the above, in the state where the molding rubber die is placed on the lower lid and the lower punch outside the molding container, the powder material is filled and tapping is performed, and after the powder material is filled, the lower lid and the lower punch are raised. A dry cold isotropic pressure molding method, wherein the molding rubber mold is inserted into the molding container to perform pressure molding, and only the molded body is taken out together with the lower punch after the pressure molding.