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Machine part and method for manufacturing same

A technology for mechanical components, manufacturing methods, applied in the direction of manufacturing tools, coatings, furnace types, etc., can solve problems such as strength deterioration

Inactive Publication Date: 2005-10-19
HONDA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, when the surface hardness becomes low, then the component strength of mechanical parts such as wear resistance and fatigue characteristics deteriorates

Method used

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  • Machine part and method for manufacturing same
  • Machine part and method for manufacturing same
  • Machine part and method for manufacturing same

Examples

Experimental program
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Effect test

Embodiment

[0079] Steel having the chemical composition listed in Table 1 was melted, and hot forged to produce a rod-shaped forged material with a diameter of 40 mm. The forged material was then kept heated at 880° C. for 60 minutes, and then normalized by cooling to room temperature. The forged material is then processed into figure 1 Geometry of crankshaft flange portion shown. The processed flange part is nitrided by gas soft nitriding. The conditions employed here included 2 hours (7.2 × 10 3seconds) and a processing temperature of 600° C., these conditions are within the usual range. The test products 1 to 10 and comparative products 1 to 12 produced in this way were tested by the detection methods shown below. Table 1 also shows the chromium equivalent Cr [eq.] and carbon equivalent C [eq.] of each steel constituting each test piece. Table 1 also shows H'(0.3×10 -3 ), the calculated value is the Vickers hardness value at a depth of 0.3 mm from the component surface.

[0080...

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Abstract

A mechanical component 1 composed of a steel is surface-hardened by nitriding, and specifically has a surficial layer 2 raised in the surface hardness by the nitriding, and an inner portion 3 not affected by the nitriding and showing a nearly constant hardness. Vickers hardness of the inner portion 3 is adjusted to 190 to 260 HV, Vickers hardness of the surficial portion 2 measured at a reference position corresponded to a 50 mu m depth from the component surface is adjusted to 340 to 460 HV, and effective depth of hardened layer measured from the component surface 4, where a Vickers hardness of 270 HV is achieved, is adjusted to 0.3 mm or more. This makes it possible to provide a mechanical component which is composed of a steel and surface-hardened by nitriding, and is successfully improved in the strength and bending straightening property, and also to provide a method of fabricating the same.

Description

technical field [0001] The present invention relates to machine parts made of steel subjected to surface hardening treatment by a nitriding method and a manufacturing method thereof, and more particularly, the present invention relates to machine parts and machine parts subjected to surface hardening treatment while imparting not only strength but also bending straightening characteristics thereto and its method of manufacture. Background technique [0002] Mechanical components such as gears, bearings, shafts, crankshafts and connecting rods place high demands on wear and fatigue properties. The manufacture of these mechanical components often includes case hardening for increased strength such as wear resistance and fatigue properties. Usually after hot forging of the material to be cast made of carbon steel or alloy steel for the manufacture of mechanical structures, an annealing treatment typically such as normalizing, and further processing into the required geometry o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/06C21D9/30C22C38/00C22C38/02C22C38/04C22C38/42C22C38/58C22C38/60C23C8/26C23C8/50
CPCC21D1/06C23C8/50C22C38/02C22C38/04C22C38/42C23C8/26
Inventor 松田英树高岛光男井上幸一郎红林丰松村康志
Owner HONDA MOTOR CO LTD
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