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Mechanical structural component, sintered gear, and methods for producing same

A mechanical structure and sintered gear technology, which is applied in mechanical equipment, belts/chains/gears, transportation and packaging, etc., can solve the problems of increased manufacturing cost, reduced dimensional accuracy, and reduced dimensional accuracy, so as to improve static strength and high Effects of Dimensional Accuracy, Toughness and Fatigue Strength Improvement

Inactive Publication Date: 2014-11-19
NTN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, according to the above method, although static strength, toughness and fatigue strength can be improved, there is a problem that shape deformation occurs due to release of residual stress etc. through heat treatment history, thereby reducing dimensional accuracy
In particular, the sintering-forging method poses a problem of further reduction in dimensional accuracy due to hot forging
Moreover, since the methods disclosed in the above-mentioned PTD1 and PTD2 each include a special process, the manufacturing cost also tends to increase

Method used

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  • Mechanical structural component, sintered gear, and methods for producing same
  • Mechanical structural component, sintered gear, and methods for producing same
  • Mechanical structural component, sintered gear, and methods for producing same

Examples

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[0106] Experiments were carried out to confirm the superiority of the mechanical structural parts of the present invention. Each test procedure is as follows. First, three types of metal powders shown in Table 1 described below were prepared as raw material powders, and molded and sintered under the conditions shown in Table 1. After the obtained sintered body was cold-rolled to the machining allowance shown in Table 2, the sintered body was heated to 870° C. in a carburizing atmosphere and kept for 30 minutes, thereby forming a carburized layer having a thickness of 120 μm on the surface . Then, after performing quench hardening, the sintered body was heated to 150° C. and kept for 90 minutes, thereby performing a tempering treatment. Through the above process, the outer diameter × inner diameter ×A ring-shaped test piece with a height of 7mm (thickness 3mm). In addition, the above-mentioned cold rolling work (Examples 1 to 6) was performed on the inner and outer perip...

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Abstract

This sintered gear, which is a mechanical structural component, is a mechanical structural component made of a metal sintered body and comprises: a base region (13); and a high-density region (14) that has a smaller porosity than the base region (13) and that is formed so as to include the surface (15) and a maximum stress position (17) which is the position where maximum tensile stress or maximum shear stress is applied. A region including the surface (15) has a surface-hardened layer (16) formed by being subjected to a hardening treatment.

Description

technical field [0001] The present invention relates to mechanical structural parts, sintered gears and methods of producing mechanical structural parts and sintered gears, in particular to mechanical structural parts manufactured from sintered bodies, sintered gears manufactured from metal sintered bodies, and the production of mechanical structural parts and sintered gears. way of gears. Background technique [0002] Traditionally, gears have been used as mechanical structural components for transmitting power. Gears are made using molten materials and the like. As a typical method of manufacturing gears from molten materials, a method of cutting teeth using hobbing or rack-type cutters is well known. According to this gear cutting method, a material (gear blank) having a disc shape is first prepared. The part of the gear blank other than the tooth part has been machined in advance. The gear blank is subjected to a skiving process to provide tooth spaces, thereby obtai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F5/08B22F3/02B22F3/24B22F1/05
CPCB22F5/08B22F3/168C22C33/0264B22F2003/241B22F2201/30B22F2207/17B22F2302/10B22F2998/10Y10T74/1987B22F2003/248B22F1/05B22F3/10B22F3/24B22F3/26F16H55/06F16H55/17
Inventor 奥野孝洋岛津英一郎荒木洸
Owner NTN CORP
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