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Method for shaping low temperature fluxion temperature pressure

A technology of warm press forming and low temperature flow, applied in the field of powder metallurgy, can solve the problem of high cost of metal injection molding process, and achieve good industrial production prospects, good practicability and good adaptability.

Inactive Publication Date: 2008-05-14
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies in the complex shape of traditional pressing and warm pressing forming parts, and overcome the high cost of metal injection molding process, and provide a short-process and low-cost low-temperature flow for manufacturing powder metallurgy complex parts near net shape Warm pressing method,

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: Low-temperature flow and warm-press forming method of iron-based alloy mixed powder

[0024] The optimization process and conditions of the low temperature flow and warm compression forming method of iron-based alloy mixed powder are as follows:

[0025] 1. Use <147μm atomized iron powder and 2-8μm carbonyl iron powder with a mass ratio of 1:0.4 and mix them in a V-type mixer for 90 minutes to make primary mixed powder. Select the polyethylene glycol wax powder as the binder, first dissolve the polyethylene glycol wax powder in alcohol, and add it to the initial mixing powder according to its mass percentage content of 2%, knead and stir, and dry powder;

[0026] 2. Heat the above-mentioned iron-based alloy mixed powder mixed with binder to the softening point temperature of the binder at 64°C;

[0027] 3. The mold adopts a split mold, and the mold is heated to about 64°C;

[0028] 4. Fill the heated alloy mixed powder into the mold cavity to make it pr...

Embodiment 2

[0030] Embodiment 2: The low-temperature flow warm-press forming method of tungsten-based alloy mixed powder

[0031] The optimization process and conditions of the low-temperature flow and warm-press forming method of alloy mixed powder are as follows:

[0032] 1. 2~4μm tungsten powder, 3~5μm nickel powder, and 2~5μm iron powder are respectively calculated as 61:34:5; 79:16:5; 89:7.7:3.3 ingredients according to the mass ratio. Pre-mixed on a V-type mixer, and then milled for 5 hours on a drum ball mill with a ball-to-material ratio of 2:1 to make primary mixed powder. 4% by mass of binder is added, the binder is a mixture of polyethylene and petroleum hydrocarbon resin, and the mass percent of petroleum hydrocarbon resin and polyethylene is 1:0.4. The binder and primary mixed powder were kneaded for 2 hours, then granulated and dried.

[0033] 2. Heat the tungsten-based alloy mixed powder mixed with the binder to the softening point temperature of the binder at 96°C.

[0...

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Abstract

The invention provides a flow warm compaction forming method with low temperature, which adopts the mixed Fe-based or tungsten based alloy powder and manufactures the metallurgical components with complicated forms under the circumstances of 60 to 100 centigrade. The invention is characterized in the following optimization craft procedure and conditions: certain amount of thermoplastic binder (1.5 to 4% weight percent) is added to the mixed alloy powder and the mixed alloy powder is fully and evenly mixed, then the mixed alloy powder is heated to the temperature little higher than the softening point of the used binder and is put inside the die cavity; the invention is pressed and formed under the circumstances of 220 to 260mm / min axially pressing speed and 600 to 700MPa pressure of the axial direction. The invention has the advantages of wide powder resources and unnecessary degreasing procedure in powder injection molding, realizing the near-net forming of the components with high performance, high density and complicated forms. The invention also has the advantages of simple technology, favorable practicability, wide application for the prepared components to industries of machinery, automobiles and sporting goods, and favorable prospects of commercial production.

Description

technical field [0001] The invention relates to powder metallurgy technology, and specifically refers to a low-temperature flow warm-press forming method for manufacturing complex-shaped powder metallurgy parts with a short process and low cost. Background technique [0002] Metal powder warm compression forming and injection molding technology are two hot spots in the research and development of powder metallurgy technology. Powder warm compaction is the Hoeganaes company in the United States in 1994 at the International Conference on Powder Metallurgy and Granular Materials (PM 2 TEC94) announced that at present, extensive research has been carried out in powder preparation, process optimization, warm pressing and sintering behavior, densification mechanism, numerical simulation and equipment, and industrialized large-scale production has been realized. [0003] In the past ten years, new technologies and processes of powder metallurgy have emerg...

Claims

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Application Information

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IPC IPC(8): B22F3/16
Inventor 肖志瑜王军方亮邵明李元元
Owner SOUTH CHINA UNIV OF TECH