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High-density molding device and high-density molding method for mixed powder

A mixed powder, high-density technology, applied in the direction of material forming presses, magnetic objects, manufacturing tools, etc., can solve the problems of insufficient density, reduced quality of powder compacts, and insufficient mechanical strength, etc., to promote production lines and operations Easy, easy-to-operate effects

Inactive Publication Date: 2013-10-30
AIDA ENG LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Furthermore, when performing sintering treatment (high-temperature atmosphere), since the oxidation is aggravated with temperature and time, the lubricant in the powder particle coating state burns and produces residues, resulting in a decrease in the quality of the powder compact after press molding. Therefore, the actual production When the density becomes 7.3g / cm 3 the following
Also, any improvements are complex and inevitably costly
The operation is also troublesome and the practicability is poor
[0009] Especially considering the use of powder compacts to make magnetic cores (magnetic cores) for electromagnetic equipment (motors or transformers, etc.), it is often pointed out that this level of density (7.3g / cm 3 Below) is far from meeting the needs

Method used

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  • High-density molding device and high-density molding method for mixed powder
  • High-density molding device and high-density molding method for mixed powder

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no. 1 approach ）

[0062] The high-density molding device of this mixed powder 1 such as Figure 1 ~ Figure 5E As shown, there is a mixed powder supply machine 10, a first pressure molding machine 20, a heating and heating machine 30, and a second pressure molding machine 40, and the high-density molding method of this mixed powder can be stably and reliably implemented. The high-density molding method consists of the following steps: the mixed powder filling step (PR1) of filling the mixed powder 100 into the first mold (lower mold 21), the mixed powder 100 is 0.2% to 0.1% (0.2 Wt%~0.1wt%) weight ratio to the base metal powder mixed with a mixture of lubricant powder with a low melting point; in the first mold (lower mold 21) to apply the first pressure (P1) to the mixed powder in the first mold, the forming true density ratio is 80 %~90% mixed powder intermediate compact (hereinafter sometimes referred to as intermediate powder compact 110) intermediate powder compact forming step (PR2); heati...

no. 2 approach ）

[0148] The implementation is as Image 6 shown. Compared with the case of the first embodiment, it is characterized in that the mixed powder supply machine 10 and the first press molding machine 20 are provided as they are, and the heating and temperature raising machine 30 and the second press molding machine 40 are integrally formed.

[0149]That is, the high-density molding device is formed by the heating and pressing molding machine 70 integrally integrating the functions of the heating and temperature raising machine 30 in the first embodiment and the function of the second pressing and molding machine 40 . The heating and pressing molding machine 70 is formed by a plurality of (two in this embodiment) heating and pressing molding sub-machines 70A and 70B. Sequential actions can be selected during the manufacturing cycle.

[0150] The basic configuration of each heat press molding sub-machine 70A ( 70B) is set to be the same as that of the second press molding machine 4...

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Abstract

In the present invention, a first die is filled with a mixed powder resulting from admixing 0.1-0.2% by weight ratio of a low-melting-point lubricant powder to a basic metal powder, a first applied pressure is applied within the first die, molding a mixed powder intermediate compact having a real density ratio of 80-90%, the mixed powder intermediate compact is heated, actively raising the temperature of the mixed powder intermediate compact to a melting point equivalent temperature of the lubricant powder, the temperature-elevated mixed powder intermediate compact is set in a second die that has been warmed to the melting point equivalent temperature, and a second applied pressure is applied to the mixed powder intermediate compact within the second die, molding a high-density mixed powder completed compact.

Description

technical field [0001] The invention relates to a high-density forming method and a high-density forming device, which can form high-density (such as 7.75g / cm 3 ) powder compact. Background technique [0002] Generally, the powder metallurgy technology is to first pressurize (compress) the metal powder to form a powder compact of a specified shape, and then heat the powder compact to a temperature near the melting point of the metal powder to promote interparticle bonding (solidification). A series of technologies for sintering treatment. As a result, mechanical parts with complex shapes and high dimensional accuracy can be manufactured at low cost. [0003] With the demand for smaller and lighter mechanical parts, it is required to increase the mechanical strength of powder compacts. On the other hand, if the powder compact is exposed to a high-temperature atmosphere, the magnetic properties are reduced. Therefore, the subsequent high-temperature treatment (sintering tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/02H01F3/08H01F41/02
CPCB30B11/02H01F41/02H01F1/153B22F3/02B22F3/006H01F1/22C22C45/00C22C33/02B22F2003/023C22C38/00C22C38/02C22C45/02H01F1/15358H01F1/24H01F41/0246B30B11/027B30B11/06B30B15/304B29C43/006B29L2031/772
Inventor 长谷川和宏平井佳树
Owner AIDA ENG LTD
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