Method for manufacturing mechanical part excellent in rolling fatigue life

A technology for rolling fatigue life and mechanical parts, applied in engine components, rotating parts that resist centrifugal force, mechanical equipment, etc., can solve problems such as damage, short life, and inability to fully realize mechanical parts and devices, and improve rolling fatigue life. Effect

Active Publication Date: 2012-07-11
SANYO SPECIAL STEEL COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In addition, even if steel materials made of such high-cleanliness steel are used for mechanical parts and devices, it is not possible to sufficiently suppress the short life and breakage of these mechanical parts and devices.

Method used

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  • Method for manufacturing mechanical part excellent in rolling fatigue life
  • Method for manufacturing mechanical part excellent in rolling fatigue life
  • Method for manufacturing mechanical part excellent in rolling fatigue life

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] As an example of the present invention, conditions and obtained results will be described. First, Table 1 shows the component composition of the test material used as the steel type of the ring-shaped base material 2 .

[0037] Table 1

[0038] Components of the test material (unit: mass %)

[0039]

[0040] In this example, the test materials of the steel types shown in Table 1 were implemented. First, the molten steel is oxidized and refined in an arc melting furnace, then reduced and refined in a ladle refining furnace (LF), and degassed by a circular vacuum degasser (RH) to reduce the oxygen content in the molten steel , the molten steel is manufactured into steel ingots by continuous casting. This steel ingot is hot-rolled as usual to form a steel material, and after that, a steel pipe is formed by a three-roll mill, and a conventional heat treatment for spheroidizing is prepared.

[0041] Cut the steel pipe composed of the test material shown in Tabl...

Embodiment 2

[0054] A test piece was produced in the same manner as in Example 1 except that a hot forged ring was produced instead of the steel pipe. The method of making the hot forging ring is as follows. First, the molten steel is oxidized and refined in an arc melting furnace, then reduced and refined in a ladle refining furnace (LF), and degassed by a circular vacuum degasser (RH) to reduce the oxygen content in the molten steel , Through the molten steel, steel ingots are manufactured by continuous casting. The steel ingot is hot-rolled as usual to form a steel material, and after that, the sheared billet is made into a hot forging ring with an outer diameter of φ80mm, a wall thickness of 8.7mm, and a width of 27.2mm by hot forging, and then the conventional spheroidizing heat is applied to them. Handling ready for hot forging rings. The outer and inner diameters of the hot-forged rings obtained as described above and composed of the test materials shown in Table 1 were machined t...

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Abstract

Provided is a method for manufacturing a mechanical part (7) which has a rolling portion (6) on which a rolling element rolls and which is excellent in rolling fatigue life. An annular blank (2) to form the rolling portion (6) is subjected to cold forging by applying hydrostatic stress onto an inner diameter surface (2a) of the annular blank (2), whereby the rolling portion (6) on which the rolling element rolls is formed on the inner diameter surface (2a) of the annular blank (2) and the inner diameter of the portion of the annular blank (2) other than the rolling portion (6) is increased. Thus, an interface state between non-metallic inclusions contained in the steel material of which the annular blank (2) is made and the steel material, which is the matrix phase, is improved, and the annular mechanical part (7) having on the inner diameter portion the rolling portion (6) which is excellent in rolling fatigue life is manufactured.

Description

[0001] Cross-reference of related applications [0002] This application claims priority based on Japanese Patent Application No. 2009-194962 filed on August 26, 2009 and Japanese Patent Application No. 2010-185927 filed on August 23, 2010, with reference to their entire disclosures. In the description of the invention of this application. technical field [0003] The present invention relates to the manufacture of mechanical parts made of steel such as bearings, gears, hub units, continuously variable transmissions, constant velocity connectors, and piston pins, and in particular to the manufacture of mechanical parts made of annular bodies that require good rolling fatigue life manufacture. Background technique [0004] In recent years, as the performance of various mechanical devices has increased, the use environment of mechanical parts and devices that require rolling fatigue life has become very severe, and there is a strong demand for improving the life and reliabili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21K1/04B21J5/00B21J5/08B21K21/16C21D7/10F16C33/64
CPCB21K21/16F16C33/64B21K1/04C21D1/25B21J5/00C21D9/40C21D1/32C21D8/10C21D7/10B21K23/04F16C19/184F16C2240/40B21J5/08
Inventor 中沟利尚桥本和弥
Owner SANYO SPECIAL STEEL COMPANY
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