JPH09155597A - Method for taking out formed body in dry hydrostatic pressure forming - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently and in-expensively improve a CIP formed with a simple device by drawing out a mandrel from a formed body together with a bottom punch and taking out the formed body while holding the external circumference face of the forming body as holding the forming body vertically. SOLUTION: A bottom punch 9 is drawn downward from the lower end of a pressure vessel 2 together with a mandrel 3 followed with a formed body 12, and it is arranged at the position so that the upper end part of the formed body 12 is made lower than the lower end of the pressure vessel 2 (a). A formed body circumferential face holding means 21 fixed on a supporting body 29 through an air cylinder is absorbed on the external circumferential face of the formed body 12 (b). The bottom punch 9 is moved downward and an internal 30 requiring for a supporting part 16 to insert between an opening end face of the formed body 12 and the upper face of the bottom punch is installed. An opening end face supporting means 15 is moved toward the formed body 12 and inserted in the interval 30 (c). By moving the bottom punch 9 downward to the position so that the upper end part of the mandrel 3 is made lower than the lower end of the opening end face supporting means 15, the formed body 12 is drawn out from the mandrel 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for taking out a molded body in dry isostatic pressing for molding, for example, ceramic powder, metal powder or the like.

[0002]

2. Description of the Related Art In general, dry isostatic pressing (hereinafter referred to as CIP molding) comprises powder filling, pressurizing, depressurizing, and unloading a molded body. It is preferably used for the purpose of molding into a cylindrical shape or a cylindrical shape.

The molding process by CIP molding will be described with reference to FIGS. 4 to 6, taking as an example the molding of a bottomed cylindrical body. First,
As shown in FIG. 4, molding powder A such as ceramic powder or metal powder is inserted and filled into the molding space 8 in the pressure container 2 via the powder supply nozzle 1. Here, the pressure vessel 2 has a molding space 8 formed therein from a cylindrical mandrel 3, a cylindrical molding rubber die 4, and a bottom punch 9 that supports the mandrel 3 from below. Rubber mold 4
A pressure medium sealing rubber 5 that surrounds the molding rubber die 4 is provided on the outer peripheral side in the circumferential direction. A pressure medium inlet / outlet 6 is provided in the pressure vessel 2. Reference numeral 7 denotes a seal rubber holder.

The molding powder A inserted and filled in the molding space 8 in the pressure container 2 is obtained by inserting the top punch 11 having the top rubber stopper 10 into the upper part of the pressure container 2 and then, as shown in FIG.
As shown in FIG. 3, the pressure medium seal rubber 5 and the molding rubber mold 4 are pressurized by the pressure medium flowing from the pressure medium inlet / outlet 6 from the high pressure pump (not shown) via the pressure booster (not shown). Via compression molding. After completion of the compression molding, as shown in FIG. 6, the pressure medium is caused to flow out from the pressure medium inlet / outlet 6 to restore the molding rubber die 4.

Further, conventionally, the removal of the molded body from the CIP molding apparatus has been performed by the method shown in FIGS. 7 (a) to 7 (c).

First, as shown in FIG. 7A, the bottom punch 9 is taken out from the pressure vessel 2 by raising the top punch 11 and lowering the bottom punch 9. Next, as shown in FIG. 7B, the outer peripheral surface of the molded body 12 that is inclined together with the bottom punch 9 is held by the gripper 13. Finally, as shown in FIG. 7C, the gripper 13 is slid obliquely upward along the gripper support column 14 arranged in parallel with the molded body 12,
The molded body 12 is removed from the mandrel 3.

[0007]

However, in order to take out the molded body by the above method, it is necessary to dispose the gripper support column in parallel with the axis of the mandrel and move the gripper along the axis of the mandrel. It is difficult to adjust the axis of the gripper support column and the mandrel,
This has been an obstacle to improving the efficiency of the entire CIP molding.
Further, since the molded body is inclined and moved at the time of taking out, in order to transfer the taken-out molded body to the conveyor or the like, the molded body must be vertical or horizontal, and the configuration of the take-out device is complicated. Efficiency of CIP molding
It was an obstacle to cost reduction.

In addition, when the molded body has a bottomed cylindrical shape, the mandrel and the molded body are difficult to separate because the inside of the molded body has a negative pressure, and the gripper slips on the outer peripheral surface of the molded body when the gripper is moved. There is a case. In order to prevent this, it is necessary to hold the molded body with a stronger force or reduce the moving speed of the gripper. However, if the gripping force is increased, the molded body is thin and the molded body may be damaged if the thickness is less than about 1/15 of the inner diameter of the molded body, and if the moving speed of the gripper is reduced, , C
There is a problem that the efficiency of IP molding is reduced.

[0009]

Means for Solving the Problems The present invention has been made in view of such a situation, and an object of the present invention is to carry out easily in a short time without risk of damaging a molded body. (EN) Provided is a method for taking out a molded body in a dry hydrostatic pressure molding which can be carried out.

That is, according to the present invention, the outer peripheral surface is formed by the inner peripheral surface of the molding rubber die, and the inner peripheral surface is formed by the peripheral surface of the mandrel whose one end is fixed to the bottom punch disposed in the lower portion of the molding rubber die. After filling the cylindrical or bottomed cylindrical molding space where the peripheral surface is formed with the molding powder, apply hydrostatic pressure with a pressure medium from the outer peripheral side of the molding rubber mold in the pressure vessel. A method for taking out a molded body in a dry hydrostatic pressure molding in which the molding is performed by depressurizing the outer peripheral side of the molding rubber mold, and then the bottom punch is pulled out from the pressure container together with the mandrel and the molded body, Then, while holding the outer peripheral surface of the molded body by the molded body peripheral surface holding means, the bottom punch together with the mandrel is pulled out from the molded body, a method for taking out the molded body in dry isostatic pressing Provided.

In the above-mentioned molded body takeout method, it is preferable that the bottom punch together with the mandrel is pulled out from the molded body while the opening end face of the molded body is supported by the opening end face supporting means from the bottom punch side. When the molded body is a bottomed cylindrical molded body, the top of the molded body may be further held by a molded body top portion holding means when the bottom punch is pulled out together with the mandrel from the molded body. preferable.

In the present invention, it is preferable that the means for holding the peripheral surface of the molded body and / or the means for holding the top of the molded body hold the molded body by suction.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, the molded body is taken out by pulling out the mandrel together with the bottom punch from the molded body while the peripheral surface is held by the molded body peripheral surface holding means. That is, conventionally, the molded body was taken out by moving the molded body while the bottom punch and the mandrel were fixed, but in the present invention, the mandrel together with the bottom punch is fixed while the molded body is fixed at a fixed position. The molded body is taken out by moving.

Therefore, in the conventional method, it was necessary to adjust the shaft centers of the gripper support column and the mandrel, whereas in the present invention, the shaft centers need not be adjusted. Further, since the molded body is taken out by pulling out the bottom punch accompanied by the mandrel while holding the molded body, it is possible to take out the molded body in a short time. Further, in the present invention, since the molded body is taken out by moving the bottom punch while keeping the molded body vertical, the take-out device may be simple and the angle of the molded body can be changed when transferring. There is no need, and the efficiency and cost of CIP molding can be reduced.

In the molded body takeout method of the present invention, it is preferable to pull out the bottom punch together with the mandrel from the molded body while supporting the open end surface of the molded body from the bottom punch side by the opening end face support means.

By supporting the open end surface of the molded body, even if the force for holding the peripheral surface of the molded body is weakened to some extent, when the bottom punch is pulled out, the molded body peripheral surface holding means slips on the outer peripheral surface of the molded body. There is no fear and the mandrel can be pulled out quickly. Therefore, even if the molded body peripheral surface holding means holds the molded body, the risk of damaging the molded body is reduced and the molded body can be taken out in a shorter time. Supporting the open end surface is particularly effective when the molded body is thin or long.

FIG. 2 shows an example of the above-mentioned opening end face supporting means. The open end face support means 15 has a U-shaped open end face support portion 16, and the curved portion 17 has a size adapted to the peripheral surface of the mandrel 3. A rubber member 18 is attached to the opening end face supporting portion 16, and a main body 19 made of SUS is attached.
By directly contacting the open end face 20 of the molded body 12, the molded body 12 is prevented from being scratched.

Further, when the molded body has a bottomed cylindrical shape, the top of the molded body may be further held by the molded body top portion holding means when the bottom punch together with the mandrel is pulled out from the molded body. preferable.

By holding the molded body on both the peripheral surface and the apex, the force for holding the peripheral surface can be weakened by the amount that the holding force is distributed to the apex, and the molded body peripheral surface holding means is provided. Even if the molded product is held, it is possible to further reduce the risk of damaging the molded product when taking it out.

In the present invention, it is preferable that the means for holding the peripheral surface of the molded body and / or the means for holding the top of the molded body hold the molded body by suction.

When the peripheral surface of the molded body is clamped, if the clamping force is too large, the molded body may be damaged when the molded body is thin, but the molded body is damaged by being held by adsorption. It is possible to further reduce the risk of

FIG. 3 shows an example of a molded body peripheral surface holding means for sucking and holding the molded body. In FIG. 3, the molded body peripheral surface holding means 21 is formed by attaching a molded body suction portion 23 made of soft rubber to a body 22 made of aluminum. Inside the molded body peripheral surface holding means 21, the molded body suction surface 24 and the main body 2 are provided.
2 has air suction holes 27 having openings 25 and 26, respectively.
Is provided. The opening 2 on the main body side of the air suction hole 27
6 is connected to a suction means (not shown) such as a vacuum pump. The molded body suction portion 23 is made of soft rubber because when the molded body 12 is held, the suction portion 23 is applied to the surface of the molded body 12 to prevent leakage of suction, and
This is to prevent the surface of the molded body 12 from being scratched.

[0023]

Hereinafter, the present invention will be described in more detail with reference to the illustrated embodiments, but the present invention is not limited to these embodiments.

Outer diameter 5 molded using a CIP molding machine
A bottomed cylindrical molded body having a diameter of 2.0 mm, an inner diameter of 48.4 mm, and a height of 480 mm was taken out from the CIP molding apparatus using the above-mentioned taking-out method. The molded body was used as a β-alumina tube for sodium-sulfur batteries, and was molded at a pressure of 2000 kgf / cm ² .

First, after decompressing the outer periphery of the molding rubber die, as shown in FIG. 1A, the bottom punch 9 together with the mandrel 3 together with the molded body 12 from the pressure container 2 at 200 mm / sec. And pulling it downward at a speed of
Was placed at a position where the upper end of the above was lower than the lower end of the pressure vessel 2.

Next, as shown in FIG. 1B, the molded body peripheral surface holding means 21 fixed to the support body 29 via the air cylinder 28 is moved toward the molded body 12 by the air cylinder 28, It was adsorbed to the outer peripheral surface of the molded body 12.

Next, the bottom punch 9 is moved downward at a speed of 50 mm / sec, and the support portion 1 of the opening end face support means 15 is provided between the opening end face of the compact 12 and the top face of the bottom punch.
The spacing 30 required for inserting 6 was provided.

Next, the opening end face support means 15 fixed to the support body 29 via the air cylinder 28 is moved toward the molded body 12 by the air cylinder 28, and as shown in FIG. 12 was inserted into the gap 30 between the open end face and the top face of the bottom punch.

Next, as shown in FIG. 1 (d), the bottom punch 9 is moved downward to a position where the upper end of the mandrel 3 is below the lower end of the opening end face support means 15, thereby forming a compact. Mandrel 3 was pulled out from 12.

Next, as shown in FIG. 1E, the opening end face support means 15 is arranged at the original position by the air cylinder 28, the support body 29 is horizontally swiveled, and the formed body 12 is placed on the formed body stand. (Not shown.) Carried up. After the suction was stopped and the molded body 12 was placed on the molded body holder, the molded body peripheral surface holding means 21 was returned to the original position by the air cylinder 28.

In the above method, the bottom punch is removed from the pressure vessel together with the mandrel with the molded body, the molded body is taken out and stored again in the pressure vessel within 20 seconds, and the molded body is taken out by the conventional method. 46 when
It was reduced by 26 seconds compared to seconds. Further, no damage due to the removal of the molded body occurred.

[0032]

EFFECT OF THE INVENTION In the present invention, the molded body is taken out by pulling out the mandrel together with the bottom punch from the molded body while keeping the molded body vertical while holding the outer peripheral surface of the molded body. It can be performed with a simpler device than the conventional method, and the adjustment of the shaft center becomes unnecessary. Also, the molded body can be taken out in a short time, and the CI
The efficiency and cost of P molding can be reduced.

Further, when the molded body is pulled out, if the opening end surface of the molded body is supported from the bottom punch side by the opening end surface supporting means, the force for holding the peripheral surface of the molded body can be weakened accordingly. In addition, since there is no risk of slipping, the mandrel can be pulled out rapidly. Therefore, the molded product can be taken out in a shorter time without damaging the molded product.

When the molded product has a bottomed cylindrical shape, the holding force can be dispersed to the apex by holding the molded product on both the peripheral surface and the apex, and there is a risk of damaging the molded product. It can be further reduced.

Furthermore, by holding the molded body by suction, the risk of damaging the molded body can be further reduced.

[Brief description of the drawings]

FIG. 1 (a) to (e) are explanatory views showing an example of a method for taking out a molded body of the present invention.

FIG. 2A is an explanatory view showing an example of an opening end face support means. (B) It is the sectional view on the AA line of (a).

FIG. 3 is a cross-sectional view showing an example of a molded body peripheral surface holding means for sucking and holding a molded body.

FIG. 4 is a sectional explanatory view showing a powder filling step of the CIP molding method.

FIG. 5 is an explanatory cross-sectional view showing a pressing step of the CIP molding method.

FIG. 6 is a cross-sectional explanatory view showing a depressurizing step of the CIP molding method.

7A to 7C are explanatory views showing a conventional method for taking out a molded body. (D) It is the sectional view on the AA line of (b).

[Explanation of symbols]

1 ... powder feeding nozzle, 2 ... pressure vessel, 3 ... mandrel,
4 ... molding rubber mold, 5 ... pressure medium sealing rubber, 6 ... pressure medium inlet / outlet, 7 ... seal rubber holder, 8 ... molding space, 9
... Bottom punch, 10 ... Top rubber stopper, 11 ... Top punch, 12 ... Molded body, 13 ... Gripper, 14 ...
.Gripper support columns, 15 ... Opening end face support means, 16 ...
.Opening end face supporting portion, 17 ... curved portion, 18 ... rubber member,
Reference numeral 19 ... Main body, 20 ... Opening end face, 21 ... Molded body peripheral surface holding means, 22 ... Main body, 23 ... Molded body suction portion, 24 ...
Formed body suction surface, 25 ... Opening portion, 26 ... Opening portion, 27 ...
-Air suction hole, 28 ... Air cylinder, 29 ... Support body, 30 ... Gap between the opening end surface of the molded body and the top surface of the bottom punch.

Claims (4)

[Claims] 1. An outer peripheral surface is formed by an inner peripheral surface of a molding rubber die, and an inner peripheral surface is formed by a peripheral surface of a mandrel whose one end is fixed to a bottom punch arranged at a lower portion of the molding rubber die. After filling the molding space in the shape of a cylinder or a cylinder with a bottom with molding powder, molding is performed by applying hydrostatic pressure with a pressure medium from the outer peripheral side of the molding rubber mold in a pressure container. A method for taking out a molded body in isostatic pressing, comprising depressurizing the outer peripheral side of the molding rubber die, pulling out the bottom punch together with the mandrel and the molded body from the pressure container, and then the outer periphery of the molded body. A method for taking out a molded body in dry isostatic pressing, characterized in that the bottom punch is pulled out from the molded body together with the mandrel while holding the surface by a molded body peripheral surface holding means. . 2. The dry hydrostatic pressure molding according to claim 1, wherein the bottom punch together with the mandrel is pulled out from the molded body while the opening end face of the molded body is supported from the bottom punch side by the opening end face support means. Method for taking out a molded article in. 3. When the molded body is a cylindrical molded body with a bottom, when the bottom punch is pulled out from the molded body together with the mandrel, the top of the molded body is further provided as a molded body top holding means. The method for taking out a molded body in dry isostatic pressing according to claim 1 or 2, which is held by holding. 4. The molded body take-out in dry isostatic pressing according to claim 1, 2 or 3, wherein the molded body peripheral surface holding means and / or the molded body top holding means sucks and holds the molded body. Method.