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A dry quasi-isostatic pressing method and device

A quasi-isostatic pressing, dry technology, applied in the direction of presses, manufacturing tools, etc., can solve the problems of easy leakage of liquid medium, pollution of pressure transmission medium of molded products, limited fluidity of rubber, etc. Sealing safety issues, good pressing effect

Active Publication Date: 2018-05-25
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because traditional isostatic pressing uses fluids such as liquid or gas as the pressure transmission medium, there are high requirements for equipment sealing, easy leakage of liquid medium and easy safety problems, and the problem that the formed product is easily polluted by the pressure transmission medium. At the same time, the equipment is huge. The operation is complicated, and it is not suitable for trial production samples such as scientific research and product trial research.
[0005] In the 1990s, a quasi-isostatic pressing method called rubber isostatic pressing appeared in Japan. This method uses the overall rubber mold and the original axial powder molding machine, and uses the elasticity of rubber under high pressure to make the axial ( or radial) pressure can act on all surfaces of the block, but due to the extremely limited fluidity of the rubber, the isostatic pressing effect is not good; at the same time, the pressure higher than 100MPa will damage the overall rubber mold, making its application The scope is very limited, which is why this method has not been applied on a large scale so far.

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  • A dry quasi-isostatic pressing method and device

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Such as figure 2 The schematic diagram of the decentralized structure of the dry quasi-isostatic pressure device is shown. The device is composed of a pressure-bearing frame 1300, a high-pressure chamber 1200 and a pressure-bearing frame fixing fixture 1100. The pressure-bearing frame 1300 is composed of two completely symmetrical parts; the high-pressure chamber The body 1200 is tightly embedded in two symmetrical pressure-bearing frames 1300 , and is clamped and fixed by the pressure-bearing frame fixing fixture 1100 .

[0033] Such as figure 1 The schematic diagram of the cross-sectional structure of the dry quasi-isostatic pressing device is shown. The high-pressure chamber 1200 includes a pressure column 100, a top cover 200, a high-pressure chamber wall 300, and a bottom bracket 400; the high-pressure chamber wall 300 is cylindrical, and an isostatic High pressure cavity 301; the high pressure cavity 301 is filled with a rigid solid quasi-fluid 900, and an elast...

Embodiment 2

[0040] A dry-type quasi-isostatic pressing method, the method is to put the raw material to be pressed into an elastic mold; and place the elastic mold in a high-pressure chamber full of rigid solid quasi-fluid with sufficient fluidity; The high-pressure chamber is pressurized, and the rigid solid quasi-fluid transmits the pressure evenly and applies it to the surface of the elastic mold to realize the quasi-isostatic pressing of the raw material to be pressed.

[0041] The rigid solid quasi-fluid is a smooth hard wear-resistant small ball; its diameter is 0.5~20mm; the material includes stainless steel, high manganese steel, die steel, bearing steel, agate, corundum, zirconia, silicon carbide or silicon nitride any of the.

[0042] The dry quasi-isostatic pressing method of the present invention will be further described below in combination with the dry quasi-isostatic pressing device of the present invention.

[0043] In this embodiment, the preferred isostatic pressing pr...

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Abstract

The invention relates to the technical field of powder press forming and particularly relates to a dry type quasi-isostatic pressing method and device. The quasi-isostatic pressing method provided by the invention comprises the steps of: putting an elastic mould where a to-be-pressed raw material is put in a high-pressure cavity filled with a rigid state solid quasi-fluid with sufficient flowability; and uniformly transferring a pressure applied to the high pressure cavity by the rigid solid quasi-fluid to all the surfaces of the elastic mould to realize quasi-isostatic pressing of the to-be-pressed raw material. The method can be widely applied to designs of various isostatic presses. The high-pressure cavity of the quasi-isostatic pressing device provided by the invention is put in a pressure-bearing frame and is rigidly fixed to the pressure-bearing frame, and the quasi-isostatic pressing can be accomplished by applying a pressure to a pressure column by virtue of a common tablet press. The dry type quasi-isostatic pressing method and device provided by the invention solve the problems that an existing isostatic press is high in sealing demand on the high-pressure cavity, a liquid medium is easy to leak to lead to unsafety and the like as well as the problem that a formed product is likely to be subjected to pollution of a pressure transfer medium. The device provided by the invention is small in size, simple to operate, convenient and efficient.

Description

technical field [0001] The invention relates to the technical field of powder compaction, in particular to a dry quasi-isostatic pressing method and device. Background technique [0002] Powder forming includes powder pressing forming and powder special forming two categories. [0003] Powder compaction, also known as axial (or radial) powder compaction, is a common method of powder forming, which uses a mold of a certain shape (usually a steel mold) and applies axial (or radial) pressure It is a method of pressing the powder into a compact with a certain density and strength and a specified shape. Powder compaction has the advantages of mature technology, good safety, and simple and convenient operation. It also has disadvantages such as uneven compact density caused by uneven pressure transmission, and it is not suitable for complex structural compact compaction. [0004] The isostatic pressing method belongs to the special powder forming method. By using fluid as the pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B30B5/02B30B7/04B30B15/02B30B15/00
CPCB30B5/02B30B7/04B30B15/0005B30B15/022
Inventor 杨万民陈森林李佳伟渊小春杨芃涛王妙
Owner SHAANXI NORMAL UNIV