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Manufacturing method of stainless steel roller needles for bearing

A manufacturing method and stainless steel technology are applied in the manufacture of stainless steel needle rollers for bearings and the manufacture of needle rollers for bearings, which can solve the problems of low processing efficiency, short service life and low precision, and achieve improved production efficiency and good corrosion resistance. , the effect of uniform quality

Active Publication Date: 2014-08-20
NINGBO ZHONGHE AUTO PATS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the defects existing in the prior art, the present invention provides a manufacturing method of stainless steel needle rollers for bearings, which not only solves the technical problems of low processing efficiency and low precision caused by single grinding of the existing needle rollers for bearings , and solve the technical problems that the surface of the needle roller made of the existing GCr15 bearing steel material is easy to wear, easy to rust after wear, and the service life is short

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Select 304 stainless steel to form a needle blank after cutting, and then use a barrel polishing machine to roll and polish the two ends of the needle into a spherical surface (throwing R balls). The barrel polishing machine can process 220kg of needles per batch. The number of revolutions of the barrel polisher is 350 rpm, and the running time of the barrel polisher is 48 hours.

[0026] Then the needle roller blank after rolling and polishing is ground successively on a centerless grinder and a barrel polishing machine to remove the burrs on the surface of the needle roller and the peripheral spherical surface at both ends of the needle roller (throwing R angle).

[0027] Then place it in a continuous furnace for heat treatment. The heat treatment includes a quenching step and a tempering step. The quenching step: the temperature is 890°C, the holding time is 250 minutes, and the HRC hardness is 70; when the quenching step is carried out, methanol is used for gas prote...

Embodiment 2

[0029] Select 304 stainless steel to form a needle blank after cutting, and then use a barrel polishing machine to roll and polish the two ends of the needle into a spherical surface (throwing R balls). The barrel polishing machine can process 240kg of needles in each batch. The number of revolutions of the barrel polisher is 320 rpm, and the running time of the barrel polisher is 50 hours.

[0030]Then the needle roller blank after rolling and polishing is ground successively on a centerless grinder and a barrel polishing machine to remove the burrs on the surface of the needle roller and the peripheral spherical surface at both ends of the needle roller (throwing R angle).

[0031] Then it is placed in a continuous furnace for heat treatment, which includes a quenching step and a tempering step. Quenching step: the temperature is 870° C., the holding time is 230 minutes, and the HRC hardness is 66; methanol is used for gas protection during the quenching step, and the flow r...

Embodiment 3

[0033] Select 304 stainless steel to form a needle blank after cutting, and then use a barrel polishing machine to roll and polish the two ends of the needle into a spherical surface (throwing R balls). The barrel polishing machine can handle 260kg of needles in each batch. The number of revolutions of the barrel polisher was 330 rpm, and the running time of the barrel polisher was 49 hours.

[0034] Then the needle roller blank after rolling and polishing is ground successively on a centerless grinder and a barrel polishing machine to remove the burrs on the surface of the needle roller and the peripheral spherical surface at both ends of the needle roller (throwing R angle).

[0035] Then it is placed in a continuous furnace for heat treatment, which includes a quenching step and a tempering step. Quenching step: the temperature is 880° C., the holding time is 240 minutes, the HRC hardness is 69, methanol is used for gas protection during the quenching step, and the flow rat...

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Abstract

The invention provides a manufacturing method of stainless steel roller needles for a bearing, which comprises the following steps of: grinding into spherical surfaces and carrying out heat treatment. The step of grinding into the spherical surfaces comprises: grinding the peripheries at the two ends of a roller needle into the spherical surfaces by adopting a polisher; the quantity of the roller needles treated by the polisher in each batch is 200-280 kg; the revolution number of the polisher is 300-350 revolution / minute, and the running time of the polisher is 48-52 hours; and the roller needles are made of stainless steel 304. The step of carrying out the heat treatment comprises: quenching and tempering, wherein in the quenching step, the temperature is 870-890 DEG C, and the thermal-insulating time is 230-250 minutes; and in the tempering step, the temperature is 180-200 DEG C, and the thermal-insulating time is 170-190 minutes. Each roller needle prepared by adopting the method can normally run in an oil-free state or under the situation that the roller needle is exposed in air, is rustless, has a service life of more than or equal to 28 thousand hours and also has a limiting speed being up to 9800 r / m.

Description

technical field [0001] The invention relates to a method for manufacturing a needle roller for a bearing, in particular to a method for manufacturing a stainless steel needle roller for a bearing, and belongs to the field of processing of mechanical parts. Background technique [0002] The needle rollers are generally installed between the outer ring and the inner ring of the needle roller bearings. During operation, the rolling of the needle rollers is used to reduce the frictional resistance between the two relative moving parts. At present, there are mainly the following types of needle rollers in conventional technology. 1. Cylindrical needle rollers. This type of needle roller is mainly used for cylindrical needle roller bearings. Needle roller assemblies can also be used directly in machinery. has been standardized. 2. Long cylindrical needle rollers. There are two kinds of needle rollers with shaft diameter and no shaft diameter. They are mainly used for long cylindr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B24B19/16B24B31/02C21D9/40
Inventor 鲍德夫
Owner NINGBO ZHONGHE AUTO PATS