JPH043746Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is a dry rubber press device used in the dry cold isostatic press method (hereinafter sometimes simply abbreviated as "dry CIP"). Regarding.

[Background of the invention] Dry CIP is used as a highly useful molding method in the field of powder molding such as ceramics and powder metallurgy.

Dry CIP includes a cylindrical pressure vessel body, a cylindrical processing rubber mold placed along the inner circumferential surface of the cylindrical pressure vessel body, and a rubber mold that covers the top and bottom of the cylindrical pressure vessel body. A dry rubber press device is used which has a lid member (usually consisting of a top bushing and a top cover, and a bottom bushing and a bottom cover).

Dry CIP using this dry rubber press equipment
In this method, pressurized fluid is supplied from the pressure fluid supply port between the inner peripheral surface of the cylindrical pressure vessel main body and the cylindrical pressurizing rubber mold, and the cylindrical pressurizing rubber mold is inserted into the center of the cylindrical pressure vessel main body. This is a method in which the powder to be molded is deformed in the direction and filled into the inside of a cylindrical body, or the powder that has been preformed in advance is pressure molded. The cylindrical pressurizing rubber mold that constitutes this dry rubber press device has an ear provided at its end between the cylindrical pressure vessel main body or between the cylindrical pressure vessel main body and the cylindrical pressurizing rubber mold. It is locked in a locking part provided at the end of the pressurizing guide placed in the pressurizing guide, and the ear part locked in this locking part is further pressed against the cylindrical pressure vessel main body etc. by the top and bottom buttons. It is attached by this.

However, this cylindrical pressurizing rubber type is very troublesome to install, and furthermore, a locking part of the cylindrical pressurizing rubber type must be provided on the cylindrical pressure vessel body (or pressurizing guide), etc. First, there is a problem in that the machining is extremely troublesome because high precision is required for the machining.

Furthermore, the conventional dry rubber press apparatus has a problem in that, due to its structure, the powder near the top bushing and bottom bushing does not have sufficient pressure moldability.

[Purpose of the invention] The present invention allows a rubber mold for cylindrical processing to be easily attached to the cylindrical pressure vessel main body (or pressurizing guide), top bushings, bottom bushings, etc. without special processing. An object of the present invention is to provide a dry rubber press device that can effectively pressurize powder.

A further object of the present invention is to provide a dry rubber press device that can improve molding accuracy in the vicinity of the top and bottom bushes.

[Means for achieving the above object] The structure of the present invention for achieving the above object is such that the pressure vessel main body, which is provided with an upper lid member and a lower lid member, is filled with pressure fluid. In a dry rubber press device that pressure-forms powder through a cylindrical pressurizing rubber mold housed inside, the pressure fluid is applied to both ends of the cylindrical pressurizing rubber mold to tightly contact the peripheral surface of the pressure vessel main body. A cylindrical pressurizing rubber mold comprising an ear portion having a generally wedge-shaped cross section and having a first contact surface and a second contact surface that tightly contacts the outer circumferential tapered surface of the upper lid member or the outer circumferential tapered surface of the lower lid member with the pressurized fluid. This is a dry rubber press equipment equipped with

In the device of the present invention, the length of this ear portion is usually made longer than the length of deformation toward the center of the cylindrical pressurizing rubber mold due to pressurized fluid injection.

[Function] The dry rubber press device of the present invention uses pressurized fluid injected between the pressure vessel main body and the cylindrical pressurizing rubber mold to press the ears provided at the end of the cylindrical pressurizing rubber mold. The first contact surface is in close contact with the inner wall surface of the pressure vessel main body, and the second contact surface is in close contact with the upper lid member or the lower lid member to form a sealed structure against pressure fluid.

[Effect of the invention] Therefore, the dry rubber press device of the invention can effectively attach a cylindrical pressurizing rubber mold without performing complex and highly accurate processing on the pressure vessel body or pressurizing guide. can do.

Furthermore, the cylindrical pressurizing rubber mold has a self-sealing structure due to the pressure fluid, so there is no movement of the cylindrical pressurizing rubber mold due to the introduction of the pressure fluid, and therefore the cylindrical pressurizing rubber mold has a self-sealing structure. The molded body is less prone to misalignment due to movement of the rubber mold. Moreover, this self-tightening seal structure can effectively prevent liquid leakage.

These effects of the dry rubber press device of the present invention are further improved by arranging a packing O-ring made of an elastic material on the ear of the cylindrical pressurizing rubber mold.

In other words, by using an O-ring in combination, it becomes easy to attach the cylindrical pressurizing rubber mold, and since a constriction is formed in the O-ring attachment part, the cylindrical shape is removed from this constriction by press-fitting the pressure fluid. The pressurizing rubber mold becomes easier to deform, and sufficient pressure can also be applied to the ends of the molded body, improving the moldability of these parts. Furthermore, sealing can be performed more reliably.

[Example] Fig. 1 shows a typical example of the dry rubber press device of the present invention. A perspective view of this dry rubber press device has a portion cut away.

In FIG. 1, the dry rubber press device includes 1
is shown. This dry rubber press equipment 1
The pressure vessel body 2 includes a pressure vessel body 2, an upper lid member 3 covering the upper part of the pressure vessel body 2, a lower lid member 4 covering the lower part, and a cylindrical pressurizing rubber mold 6.

The pressure vessel main body 2 has pressure fluid supply and discharge means. This pressure fluid supply/discharge means usually includes an inlet 7 for introducing the pressure fluid between the inner wall 5 of the pressure vessel body and the cylindrical pressurizing rubber mold 6, and an outlet 8 for discharging the introduced pressure fluid. Contains. As the pressure fluid, liquids such as water and pressure oil are usually used.

The upper lid member 3 usually consists of a top bush 9 and a top cover 10. The top bush 9 has an opening into which powder to be molded is introduced. As shown in FIG. 1, the top bushing 9 is provided with an outer circumferential surface that contacts the inner circumferential surface of the pressure vessel main body, and an annular tapered surface extending from the outer circumferential surface to the bottom surface of the top bushing 9. be fitted to the top of the The top cover 10 is attached to the top bush 9 so as to close the opening of the top bush 9 through which powder to be molded is introduced.

Further, like the upper lid member 3 described above, the lower lid member 4 includes a bottom bush 11 that is attached to the lower part of the pressure vessel main body 2, and a bottom cover 12 that closes the opening of the bottom bush 11.

A pressure guide 13 is usually provided on the inner peripheral surface 5 of the pressure vessel body in order to uniformly supply pressure fluid between the inner peripheral surface 5 and the cylindrical pressurizing rubber mold 6. .

Further, a molding rubber mold 14 is usually disposed on the side of the cylindrical pressurizing rubber mold 6 into which the powder to be molded is introduced. A cylindrical space 15 formed by this molding rubber mold 14 is filled with powder to be molded, and pressure molding is performed.

The cylindrical pressurizing rubber mold 6 usually has a cylindrical shape. This cylindrical pressurizing rubber mold 6 has ears 16a and 16b at its upper and lower ends. The ear portion 16a has a first contact surface 18a that is in close contact with the upper part of the pressure vessel main body 2, a second contact surface 19a that is in close contact with the annular tapered surface of the top bushing 9 forming a part of the upper lid member 3, and a pressure vessel main body. 2
The first contact surface 18a is in close contact with the lower part of the lower lid member 4, and the first contact surface 19b is in close contact with the annular tapered surface of the bottom bushing 11 forming a part of the lower lid member 4.

The vertical cross-sectional shape of the ears 16a, 16b is wedge-shaped. By making it wedge-shaped, the ears 16
The sealing performance between the pressure vessel main body 2 of a and 16b and the top bushing 9 and bottom bushing 11 is improved.

The size, thickness, material, etc. of the cylindrical pressure rubber mold can be the same as those of conventional cylindrical pressure rubber molds.

For example, the size of the cylindrical pressurizing rubber mold can be appropriately set according to the size of the molded article. However, the thickness of the cylindrical pressurizing rubber mold is preferably within the range of 1.0 to 20.0 mm in consideration of durability and deformability when pressure fluid is introduced. Furthermore, by keeping it within this range, the balance between the two becomes particularly good.

In the cylindrical pressure rubber mold 6 of the present invention, the ears 16a, 16b are provided with auxiliary ears 16a, 16b of the cylindrical pressure rubber mold 6 along the circumferential surfaces of the top bushing 9 and the bottom bush 11. Gaskets 17a and 17b made of elastic material to seal the
It is desirable to place

Packings 17a and 17b used in the present invention
As for the material, one made of ordinary elastic material can be used. For example, rubber. Alternatively, an annular spring can also be used.

Particularly in the present invention, it is preferable to use an O-ring.

An O-ring is an annular packing made of an elastic material, and usually has a vertical cross-sectional shape such as a polygon, circle, or oval. FIG. 1 shows an O-ring having a circular longitudinal cross-section.

FIG. 2 is a partially enlarged cross-sectional view of the vicinity of the joint with the top bushing 39 of the cylindrical pressurizing rubber mold 26 of the present invention in which an O-ring 27a is arranged. Note that the relationship between the cylindrical pressure rubber mold and the top bushing described below is similar to the relationship between the cylindrical pressure rubber mold and the bottom bushing.

In FIG. 2, the first contact surface 28a is brought into close contact with the pressure vessel main body 22 and the second contact surface 29a is brought into close contact with the top bush 39 by the pressure fluid. Then, near the lower end of this ear portion 36a, an O-
The ring 27a is arranged so that the second contact surface 29a of the cylindrical pressurizing rubber mold 26 is brought into close contact with the top bush 39 for sealing.

The contact portion of the top bushing 39 that comes into contact with the ear portion 36a is usually processed to have a shape that substantially corresponds to the shape of the ear portion 36a. That is, as shown in FIG. 2, the second contact surface 29 usually has a shape that approximately corresponds to the shape of the ear portion 36a.
Machining is done so that a is in good contact with the contact surface of the top bushing 39. In addition, in FIG. 2, the pressure vessel main body 22 with which the first contact surface 28a contacts is in the cylindrical shape as it is and is in good contact with the first contact surface 28a, so a mode in which no particularly complicated processing is performed is shown. Ta.

However, depending on the shape of the ears, it is also possible to process both the top button (and bottom button) and the pressure vessel body, and it is also possible to process the top button (and bottom button) by processing the pressure vessel body. In some cases, it may not be necessary to do so.

In the dry rubber press device of the present invention, the accuracy during this processing is sufficient as long as it roughly corresponds to the shape of the ear, and it is not particularly necessary to perform processing with high precision as in conventional methods. do not.

When pressure fluid is introduced from the pressure fluid inlet into the dry rubber press device of the present invention, the pressure fluid flows through the cylindrical processing rubber mold 26 and the pressure vessel body 22.
The pressure guide 33 acts between the pressure guide 33 and the pressure guide 33 to uniformly introduce the pressure into the entire surface.

Then, the introduced pressure fluid is transferred to the first contact surface 2
8a is in close contact with the pressure vessel main body 22, and the second contact surface 2
Turn arrow A so that 9a is in close contact with top button 39.
and pressurizes the ear portion 36a in the B direction. Therefore, this pressure generates a self-tight sealing force between the ear portion 36a, the top bushing 39, the pressure vessel main body 22, the bottom bush (not shown), and the pressure vessel main body 22.

That is, when the pressure of the pressurized fluid is low, the pressure of the pressurized fluid and the sealing force of the O-ring work together, and when the pressure of the pressurized fluid is high, a self-locking sealing force is generated mainly by the pressure of the pressurized fluid. is developed, and a good sealed structure is always formed regardless of the pressure of the pressure fluid.

On the other hand, the rubber mold 26 for cylindrical processing and the pressure vessel main body 2
The pressure fluid introduced between the cylindrical processing rubber mold 26 and the cylindrical processing rubber mold 26 deforms in the direction of the arrow a, compresses the powder to be molded, and performs pressure molding. The positions of the cylindrical processing rubber mold 26 and the cylindrical molding rubber mold 34 after they have been moved are shown by dashed lines.

By arranging the O-ring, a constriction is formed in this part as shown in Fig. 2, which facilitates deformation of the cylindrical molded rubber mold near the top bushing 39 (and bottom bushing). It becomes possible to effectively mold powder.

[Brief explanation of the drawing]

FIG. 1 is a perspective view with a partial cutout showing a typical example of the dry rubber press device of the present invention, and FIG. 2 is a rubber mold for cylindrical processing of the present invention equipped with an O-ring. FIG. 3 is a partially enlarged sectional view of the vicinity of the top bushing. DESCRIPTION OF SYMBOLS 1... Dry rubber press device, 2, 22... Pressure vessel body, 3... Upper lid member, 4... Lower lid member, 5... Inner peripheral surface of pressure vessel body, 6, 26...
Cylindrical pressurizing rubber mold, 7... Pressure fluid inlet, 8...
... Pressure fluid outlet, 9, 39 ... Top bushing, 10 ... Top cover, 11 ... Bottom bushing, 12 ... Bottom cover, 13 ... Pressure guide, 14, 34 ... Rubber mold for molding, 15 ... Space , 16a, 16b, 36a... ears, 17a,
17b, 37a...Packskin (O-ring) made of elastic material, 18a, 28b...First contact surface,
19a...Second contact surface.

Claims (1)

[Claims for Utility Model Registration] 1. By filling a pressure vessel body with an upper lid member and a lower lid member with pressurized fluid, the pressure fluid can be applied through a cylindrical pressurizing rubber mold housed in the pressure vessel body. In a dry rubber press device for pressure-molding powder, a first contact surface that tightly contacts the peripheral surface of the pressure vessel main body with the pressurized fluid and an outer periphery of the upper lid member with the pressurized fluid are provided at both ends of the cylindrical pressurizing rubber mold. A dry rubber press device equipped with a cylindrical pressurizing rubber mold provided with an ear portion having a generally wedge-shaped cross section and having a second contact surface that is in close contact with a tapered surface or an outer circumferential tapered surface of a lower lid member. 2. The dry rubber press device according to claim 1, which has an O-ring made of an elastic material in the ear portion.