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Isopressing forming method and die for powder forming tube blank

A technology of isostatic pressing and powder, applied in the direction of material forming presses, presses, manufacturing tools, etc., can solve the problems of difficult size control and rough outer surface.

Inactive Publication Date: 2009-12-30
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The density of the obtained parison is relatively uniform, and the shape, dimensional accuracy and smoothness of the inner wall are well controlled, but the outer surface is relatively rough, and the size is not easy to control. Further machining is required to obtain high dimensional accuracy and smoothness

Method used

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  • Isopressing forming method and die for powder forming tube blank
  • Isopressing forming method and die for powder forming tube blank
  • Isopressing forming method and die for powder forming tube blank

Examples

Experimental program
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Effect test

example 1

[0020] Example 1 A mullite tubular parison with an inner diameter of 35 mm, an outer diameter of 50 mm and a length of 1500 mm was prepared.

[0021] Use 5-mesh stainless steel mesh to make a round tube with an outer diameter of 29mm and a length of 1700mm as the rigid inner tube, and use a rubber sleeve with an inner diameter of 29mm, a length of 1700mm, and a thickness of 1mm, and the rubber sleeve will form an inner mold tube on the rigid inner tube; The outer mold tube is made of stainless steel pipe with an inner diameter of 50mm, a length of 1500mm, and a thickness of 50mm. The inner surface of the outer mold tube is carefully machined to obtain a proper finish; the end plugs are made of stainless steel. Combine the inner mold tube and the outer mold tube to form a cavity, fill the above cavity with properly granulated mullite powder, and mechanically vibrate the powder in the cavity during the filling process; when the cavity is filled with powder After solidification, ...

example 2

[0022] Example 2 prepares an internal diameter of 10mm circular shape, a square shape with a side length of 30mm, and a copper tubular parison with a length of 200mm

[0023] Use 5-mesh stainless steel mesh to make a round tube with an outer diameter of 6mm and a length of 250mm as the rigid inner tube, select a rubber tube with an inner diameter of 6mm, a length of 250mm, and a thickness of 1mm, and cover the rubber tube on the rigid inner tube to form an inner mold tube ; Make the outer mold tube with a square inner cavity with a side length of 30mm and a length of 250mm. The inner surface of the outer mold tube is carefully machined to obtain an appropriate finish; combine them into the cavity. Fill the above-mentioned cavity with properly granulated copper powder, and perform mechanical vibration during the filling process; after the cavity is filled with powder, seal the two ends of the cavity with two end plugs; use the pump on the end plug to The air pipe vacuumizes the...

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PUM

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Abstract

The invention provides an isopressing forming method and a die for powder forming tube blank; the method is concretely implemented by filling powder in a cavity formed by a rigid outer die tube and an elastic swell inner die tube, carrying out vacuum pump on the cavity, sealing, putting the isopressing transmission medium in the inner die tube, applying pressure on isopressing transmission medium, swelling the inner die tube and causing the powder to compress to form towards the direction of the outer die tube. The invention adopts the thought of fixed inner die and movable inner and outer dies, the press direction of powder is from the inner die towards the outer die, so that the blank can obtain appearance dimension with high accuracy and outer surface with high glossiness easily while ensuring even density distribution of the blank.

Description

technical field [0001] The invention relates to the field of material molding, in particular to the technology of forming a tubular parison from powder. The powder used can be ceramic, metal, polymer material powder and their mixed powder; the preform is tubular, and the cross-sectional shape of the tubular parison is It can be in various shapes depending on the specific product. Background technique [0002] Using powder as raw material, through powder molding and sintering, various tubular ceramics and powder metallurgy products can be made. In this process route, the powder is first agglomerated to form a tubular body, which is then heat-treated (degreasing and sintering) to form a tubular product. The density, dimensional accuracy, surface finish and physical and chemical properties of tubular products are closely related to the powder molding process. [0003] The known methods of molding powder tubular body have following four kinds: [0004] One is the common dry p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B30B11/22B30B11/30
CPCB30B11/001
Inventor 肖建中夏风李凯
Owner HUAZHONG UNIV OF SCI & TECH
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