Manufacturing method for bearing with Rockwell hardness improved

A manufacturing method and Rockwell hardness technology, applied in the field of bearing manufacturing, can solve the problem that the bearing cannot meet the requirements

Inactive Publication Date: 2017-05-31
徐文萍
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Bearings are the most commonly used parts in production, but due to the increasing requirements for bearings, some current bearings can no longer meet the requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The preparation of embodiment 1 bearing

[0041] The composition of the bearing steel is (by weight %):

[0042] 0.28% carbon;

[0043] 1.0% manganese;

[0044] 0.13% phosphorus;

[0045] 0.17% sulfur;

[0046] 1.00% silicon;

[0047] 0.06% aluminum;

[0048] 0.01% nitrogen;

[0049] 0.61% chromium;

[0050] 0.05% niobium;

[0051] 0.40% copper;

[0052] 0.40% nickel;

[0053] 1.00% molybdenum;

[0054] 0.2% vanadium;

[0055] 0.0055% boron;

[0056] 0.040% Titanium:

[0057] The rest is iron and unavoidable impurities.

[0058] 30 kg of a steel material having the above composition was melted in a high-frequency vacuum furnace, followed by casting in which the cooling rate was 1.2° C. / min to form an ingot. The ingot was kept at 950°C for 10 hours and then at 500°C for 90 minutes. Thereafter, hot forging is performed using a 500-ton hammer forging machine, thus producing bearing steel. The bearing steel is press-formed in a forging machine to manufactur...

Embodiment 2

[0059] The preparation of embodiment 2 bearing

[0060] Bearing 2 was prepared in the same manner as in Example 1 except that molybdenum was not used.

Embodiment 3

[0061] The preparation of embodiment 3 bearing

[0062] Bearing 3 was prepared in the same manner as in Example 1 except that boron was not used.

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Abstract

The invention discloses a manufacturing method for a bearing with the Rockwell hardness improved. The method includes the following processes that a steel material is melted in a high-frequency vacuum melting furnace, then casting is conducted, the cooling speed in the casting process is 1.2 DEG C/ min, and an ingot material is formed; the ingot material is maintained for 10 hours at the temperature of 950 DEG C and then is maintained for 90 minutes at the temperature of 500 DEG C; afterwards, a hammer forging machine 500 tons in weight is used for hot forging, and bearing steel is manufactured; and the bearing steel is pressed and formed in the forging machine, and therefore the bearing is manufactured. The steel material comprises, by weight, 0.25%-0.29% of carbon, 0.10%-1.20% of manganese, 0.09%-0.13% of phosphorus, 0.10%-0.19% of sulfur, 0.60%-1.00% of silicon, smaller than or equal to 0.09% of aluminum, smaller than or equal to 0.01% of nitrogen, 0.45%-0.83% of chromium, 0.04%-0.07% of niobium, smaller than or equal to 0.50% of copper, 0.05%-0.60% of nickel, 0.2%-2.00% of molybdenum, 0.2%-0.4% of vanadium, 0.0030%-0.0065% of boron, 0.010%-0.050% of titanium and the balance iron and inevitable impurities. By means of the method, the bearing with the Rockwell hardness improved can be manufactured.

Description

technical field [0001] The invention relates to the field of bearings, in particular to a method for manufacturing bearings with enhanced Rockwell hardness. Background technique [0002] Bearings are the most commonly used parts in production, but due to the increasingly high requirements for bearings, some current bearings can no longer meet the requirements. Contents of the invention [0003] The object of the present invention is to provide a method for manufacturing a bearing with enhanced Rockwell hardness. [0004] In order to realize the purpose of the present invention, the present invention provides a kind of manufacturing method of the bearing that Rockwell hardness strengthens, and this method comprises following process: steel material is melted in high-frequency vacuum melting furnace, carries out casting subsequently, and in this casting, cooling rate is 1.2°C / min to form an ingot; the ingot was kept at 950°C for 10 hours, and then at 500°C for 90 minutes; t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/60
Inventor 徐文萍
Owner 徐文萍
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