Mechanical structural parts and manufacturing method thereof

A technology of mechanical structure and manufacturing method, applied in the direction of manufacturing tools, mechanical equipment, vehicle parts, etc., can solve the problems of long processing time and high manufacturing cost, and achieve the effects of high fatigue strength, excellent dimensional accuracy, and low noise

Active Publication Date: 2018-05-04
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the past, parts requiring high dimensional accuracy were formed by mechanical cutting, but there were disadvantages of long processing time and high manufacturing cost

Method used

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  • Mechanical structural parts and manufacturing method thereof
  • Mechanical structural parts and manufacturing method thereof
  • Mechanical structural parts and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0104] Steels having the composition shown in Table 1 were melted and formed into round bars with a diameter of 39.5 mm to 90 mm by hot rolling. With the obtained round bar as the raw material, after cold forging into the involute gear shape shown in Table 2, the figure 1 Carburizing heat treatment was carried out under the conditions shown. It should be noted that the steels with a Ti content of 0.001% or 0.002% in Table 1 do not actively add Ti, but are Ti content mixed in as impurities.

[0105] Gears after carburizing heat treatment for measuring austenite grain size and gears after carburizing heat treatment for helix accuracy measurement and fatigue test are prepared, austenite grain size and helix accuracy are measured, and fatigue test is carried out.

[0106] The obtained results are shown in Table 3.

[0107]It should be noted that the measurement of the austenite grain size after the carburizing heat treatment was carried out by using an optical microscope at each...

Embodiment 2

[0120] The steels A, B, C, Q, and R used in Example 1 were formed into round bars with a diameter of 50 mm by hot rolling. Next, the resulting round bar was placed in the figure 2 Annealed under the conditions shown, cold forged to the involute gear shape shown in Table 2. after that, in figure 1 Carburizing heat treatment was carried out under the conditions shown.

[0121] After the carburizing heat treatment, austenite grain size measurement and helix precision measurement were performed, and then a fatigue test was performed.

[0122] The obtained results are shown in Table 4.

[0123] It should be noted that the area reduction ratio during cold forging, the austenite grain size after carburizing heat treatment, the helix accuracy measurement and the fatigue test were performed in the same manner as in Example 1.

[0124] [Table 4]

[0125] Table 4

[0126]

[0127] As shown in Table 4, in steels A, B, and C whose composition satisfies the present invention, by s...

Embodiment 3

[0129] Steels A, B, C, Q, and R used in Example 1 were formed into round bars with a diameter of 45 mm by hot rolling. Next, the resulting round bar was placed in the figure 2 Annealed under the conditions shown, and cold forged into a round bar with a diameter of 50 mm. Afterwards, again in figure 2 Annealed under the conditions shown, cold forged to the involute gear shape shown in Table 2. after that, in figure 1 Carburizing heat treatment was carried out under the conditions shown.

[0130] After the carburizing heat treatment, austenite grain size measurement and helix precision measurement were performed, and then a fatigue test was performed.

[0131] The obtained results are shown in Table 5.

[0132] It should be noted that the area reduction ratio during cold forging, the austenite grain size after carburizing heat treatment, the helix accuracy measurement and the fatigue test were performed in the same manner as in Example 1.

[0133] [table 5]

[0134] tab...

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PUM

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Abstract

A toothed part, which is obtained by cold forging and carburizing a steel containing the following composition as a raw material: the composition of the steel is: in mass %, C: 0.10% to 0.35% , Si: 0.01% to 0.13%, Mn: 0.30% to 0.80%, P: up to 0.03%, S: up to 0.03%, Al: 0.01% to 0.045%, Cr: 0.5% to 3.0%, B: 0.0005% to 0.0040%, Nb: 0.003% to 0.080%, and N: 0.0080% or less, Ti mixed as an impurity is suppressed to 0.005% or less, and the balance is Fe and unavoidable impurities. In terms of the austenite grain size after carburizing treatment, the area ratio of crystal grains of 50 μm or less is 80% or more, and the area ratio of grains larger than 300 μm is 10% or less. The following formula (1) is satisfied in terms of the total deviation of the helix, whereby a toothed machine structural part having excellent dimensional accuracy is produced. (Bmax / L)×103≤5...(1). Among them, Bmax is the maximum total deviation of the helix among all teeth (mm), and L is the tooth width (mm).

Description

technical field [0001] The present invention relates to toothed machine structural parts (case-hardened steel parts) such as gears and splines used in the fields of construction industrial machinery and automobiles, and a method of manufacturing the same. Background technique [0002] Not only excellent power transmission efficiency but also Due to the characteristics of high fatigue strength and low noise, it is important to improve the dimensional accuracy of the contact part between parts. [0003] In the past, parts requiring high dimensional accuracy were formed by machining, but there were disadvantages of long processing time and high manufacturing cost. Therefore, in recent years, cold forging excellent in dimensional accuracy after forming has been used in many cases. In addition, parts formed by hot forging and parts formed by cold forging have different characteristics of the final part, and parts obtained by cold forging may exhibit excellent part properties du...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00C21D1/06C21D8/00C21D9/32C22C38/32C22C38/60C23C8/22
CPCC21D9/32C23C8/22C21D1/06C22C38/32C22C38/60C23C8/02C21D1/26C21D6/002C21D6/005C21D6/008C21D8/005C22C38/001C22C38/002C22C38/008C22C38/02C22C38/04C22C38/06C22C38/26C22C38/28B21K1/30F16H55/06F16H55/17
Inventor 今浪祐太岩本隆上井清史
Owner JFE STEEL CORP
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