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

Inactive Publication Date: 2015-05-14
AIDA ENG LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The mixed powder high-density molding method described in this patent is a cost-effective way to produce high-density green compacts. It can improve the efficiency of mixing powders, reduce the size and weight of the dies, and shorten the production cycle time. Additionally, it can ensure a sufficient lubricating effect during the molding process, select a wide range of lubricants, and reduce friction resistance between the metal particles and the dies. The mixed powder high-density molding system described in this patent can reliably implement this method at a low cost and is easy to handle.

Problems solved by technology

If the heat treatment temperature is less than 500° C., breakage may occur during compression molding.
If the heat treatment temperature is more than 1000° C., the insulating coating may be decomposed (i.e., the insulating properties may be impaired).

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

Examples

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first embodiment

[0073]As illustrated in FIGS. 1 to 6E, a mixed powder high-density molding system 1 includes a mixed powder feeding device 10, a container 23, a mixed powder transfer device (lower punch 37), a first press molding device 30, a heating device 40, an intermediate green compact transfer device (extrusion rod 50), a second press molding device 60, and a product discharge device 70, and stably and reliably implements a mixed powder high-density molding method that includes a mixed powder-filling step (PR1) that fills a container 23 with a mixed powder 100, a mixed powder transfer step (PR2) that transfers the mixed powder 100 to a first die 31, an intermediate green compact-forming step (PR3) that applies a first pressure P1 to the mixed powder in the first die 31 to form a mixed powder intermediate compressed body (hereinafter may be referred to as “intermediate green compact 110”), a heating step (PR4) that heats the intermediate green compact 110 to the melting point of the lubricant ...

second embodiment

[0173]FIGS. 7 and 8 illustrate a second embodiment of the invention. The basic configuration and function are the same as those described above in connection with the first embodiment (see FIGS. 1 to 6E). In the second embodiment, a second pre-heating device 64 is provided to the second die 61 (die 62) included in the second press molding device 60, and a first pre-heating device 34 is provided to the first die 31 (die 32) included in the first press molding device 30.

[0174]Specifically, a high-density molding system according to the second embodiment is configured so that the second die 61 can be pre-heated, and a decrease in temperature of the heated intermediate green compact 110 can be prevented. Moreover, the intermediate green compact 110 can be preliminarily heated while pre-heating the first die 31. Although the first pre-heating device 34 and the second pre-heating device 64 are provided in the second embodiment, only the first pre-heating device 34 or the second pre-heatin...

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Abstract

A mixed powder placed in a container cavity is transferred to the cavity of a first die. A first pressure is applied to the mixed powder in the first die to form an intermediate green compact. The first die and the intermediate green compact are heated to heat the intermediate green compact to the melting point of a lubricant. The heated intermediate green compact is transferred to the cavity of a second die, and a second pressure is applied to the intermediate green compact to form a high-density final green compact.

Description

TECHNICAL FIELD[0001]The present invention relates to a high-density molding method and a high-density molding system that can form a green compact having high density (e.g., 7.75 g / cm3) by pressing a mixed powder twice.BACKGROUND ART[0002]Powder metallurgy is a technique that normally presses (compresses) a metal powder to form a green compact having a given shape, and heats the green compact to a temperature around the melting point of the metal powder to promote intergranular coupling (solidification) (i.e., sintering process). This makes it possible to inexpensively produce a mechanical part that has a complex shape and high dimensional accuracy.[0003]An improvement in mechanical strength of a green compact has been desired in order to deal with a demand for a further reduction in size and weight of mechanical parts. When a green compact is subjected to a high temperature, the magnetic properties of the green compact may deteriorate. Therefore, the subsequent high-temperature tr...

Claims

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Application Information

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IPC IPC(8): B22F3/16B22F3/00B22F1/105
CPCB22F3/003B22F3/16B22F3/03C22C33/02C22C38/00C22C45/00B30B11/027B30B11/10B30B15/304B30B15/34C22C38/02C22C45/02H01F41/0246B22F3/004B22F2003/023B22F2003/145B22F2998/10B30B15/0011B22F1/105
Inventor HASEGAWA, KAZUHIROHIRAI, YOSHIKI
Owner AIDA ENG LTD
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