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Green compact and method for producing same

A manufacturing method and powder technology, which is applied in the field of powder compaction and its manufacturing, can solve problems such as inability to reduce costs, and achieve the effects of preventing damage, reducing costs, and avoiding manufacturing costs

Inactive Publication Date: 2017-08-01
NTN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the above reasons, even when using the powder metallurgy technology that should be able to be manufactured at low cost, sometimes the cost reduction cannot be achieved as expected

Method used

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  • Green compact and method for producing same
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  • Green compact and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0046] An embodiment of the present invention will be described below based on specific examples.

[0047] First, test pieces of Examples 1 and 2 and Comparative Examples 1 to 4 were prepared using six types of pure iron powders having mutually different shapes as the base metal powder serving as the main raw material of the raw material powder. Here, in Examples 1 and 2 and Comparative Example 1, the pure iron powder produced by the water atomization method was used, and in Comparative Examples 2 to 4, the pure iron powder produced by the reduction method was used. For all powders, only powders with a sieve size of 250 μm or less are used.

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Abstract

A green compact according to the present invention is obtained by compression molding raw material powders having a metal powder as a primary raw material, wherein an oxide film is formed between the raw material powders that constitute the green compact, thereby binding the raw material powders to each other. The green compact is characterized in that a powder having a circularity R of 0.75 or higher at a cumulative frequency of 80% is used as the metal powder. Here, the circularity R is represented by numerical formula (1), where the two-dimensional projected area of the metal powder is denoted by S and the two-dimensional projected circumference of the metal powder is denoted by L.

Description

technical field [0001] The present invention relates to a powder compact (powder compact) and a method for producing the same, and more particularly to a powder compact suitable as a material for mechanical parts used as sliding parts impregnated with lubricating oil and a method for manufacturing the same. Background technique [0002] In the past, in the field of powder metallurgy, the raw material powder with metal powder as the main raw material was usually mixed, compressed and molded, and then sintered in a high-temperature furnace higher than 800°C to make a product, but its cost accounts for a large part of the total manufacturing cost. 1 / 4~1 / 2 of that. In addition, the powder compact expands or shrinks through the sintering process at a high temperature, so in order to control the target size and accuracy, a correction (so-called finishing) process after sintering is indispensable. For the above reasons, even when using the powder metallurgy technology that should ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/02B22F1/00B22F1/02B22F3/11B22F3/24B22F5/00C22C33/02F16C33/10F16C33/12F16C33/14B22F1/06
CPCB22F3/02B22F3/11B22F3/24B22F3/225B22F3/26B22F5/10B22F2009/0828B22F2998/10F16C33/128B22F1/06B22F3/1021B22F2201/05B22F2003/242B22F2301/35F16C33/1025F16C33/145F16C2220/20
Inventor 八代尚树大平晃也
Owner NTN CORP
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