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Manufacturing method for improving bearing steel ball surface layer performance

A manufacturing method and technology of bearing steel balls, applied in the direction of manufacturing tools, bearing components, shafts and bearings, etc., can solve the problems of metal plastic exhaustion, plastic damage, reduction of steel ball strength, hardness and wear resistance, etc.

Active Publication Date: 2018-08-14
DEQING TIANMA BEARING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, many steel ball manufacturing companies use one-way rotation to hot-roll steel balls. This one-way rolling method of the rolls causes friction on the surface of the steel balls to cause local metal plasticity in the surface (near the surface) of the steel balls to deplete and cause plasticity. damage
In addition, after the steel ball is hot-rolled, the temperature is lowered by fog cooling, so that the internal temperature of the steel ball cannot be quickly reduced and the network carbide is eliminated, which reduces the strength, hardness and wear resistance of the steel ball

Method used

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  • Manufacturing method for improving bearing steel ball surface layer performance
  • Manufacturing method for improving bearing steel ball surface layer performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Such as Figure 1~2 A manufacturing method for improving the performance of bearing steel balls shown includes the following steps:

[0022] Step 1: Heating the steel rod to a temperature above the austenitization temperature, and hot-rolling and forming steel balls by unidirectional rotation of the first skewed rolling roll.

[0023] Step 2: When the steel ball in step 1 is hot-rolled to 50%~70% of deformation, transfer the steel ball bar to the second skewed rolling roll to continue rolling in one direction, so that the metal plastic deformation of the steel ball bar occurs Reverse macro-shear stress zone; the skew rolling direction of the second skew roll is opposite to that of the first skew roll, and the roll inclination angle is the same; if the first skew roll can be selected as a left-handed roll, the second skew roll can be selected as It is a right-handed roll.

[0024] Step 3: Cool the hot-rolled steel ball rapidly, so that the temperature of the core and s...

Embodiment 2

[0027] This embodiment is based on the basis of embodiment 1, and the specific material selection and process requirements of step 1 and step 2 are limited, and the specific scheme is as follows.

[0028] A manufacturing method for improving the performance of bearing steel balls, comprising the steps of:

[0029] Step 1: Heat the GCr15SiMn bearing steel bar with a diameter of 60 mm to 1050 °C, roll the steel ball on the first skew roll to prefabricate the steel ball with a connection neck of 20 mm, and lower the temperature to about 920 °C;

[0030] Step 2; when the steel ball in step 1 is hot-rolled to 50%~70% deformation, transfer the prefabricated steel ball bar with a connection neck of 20 mm to the right-handed rolling roll on the second skew roll to continue rolling Reverse macro-shear stress zone occurs in the metal plastic deformation of the steel ball bar, and the temperature of the steel ball drops to 830˚C after rolling;

[0031] Step 3: Cool the hot-rolled steel ...

Embodiment 3

[0034] This embodiment is based on the basis of embodiment 2, and the specific material selection and process requirements of step 3 and step 4 are limited, and the specific scheme is as follows.

[0035] A manufacturing method for improving the performance of bearing steel balls, comprising the steps of:

[0036] Step 1: Heat the GCr15SiMn bearing steel bar with a diameter of 60 mm to 1050 °C, roll the steel ball on the first skew roll to prefabricate the steel ball with a connection neck of 20 mm, and lower the temperature to about 920 °C;

[0037] Step 2; when the steel ball in step 1 is hot-rolled to 50%~70% deformation, transfer the prefabricated steel ball bar with a connection neck of 20 mm to the right-handed rolling roll on the second skew roll to continue rolling Reverse macro-shear stress zone occurs in steel ball bar metal plastic deformation, improves grain refinement degree of steel ball surface (near surface layer), reduces plastic damage microscopic tear zone, ...

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Abstract

The invention relates to the field of hot rolling molding heat treatment, in particular to a manufacturing method for improving bearing steel ball surface layer performance. The manufacturing method for improving the bearing steel ball surface layer performance comprises the following steps that 1, a steel bar is heated to the temperature higher than the austenitizing temperature, and a first inclined roller is used for one-way rotary hot rolling for forming a steel ball; and 2, when the steel ball in the step 1 is subject to hot rolling to 50%-70% deformation, a steel ball bar is transferredto a second inclined roller to be continuously subject to one-way rotary rolling, metal molding deformation of the steel ball bar generates a reverse macroscopic shear stress strip, and the inclined rolling direction of the second inclined roller is opposite to the inclined rolling direction of the first inclined roller, and the roller dip angles are the same. According to the manufacturing method, shortcomings in the existing technology are overcome, the steel ball surface layer (near surface) grain refinement degree is improved for achieving ultrafine grains, and molding damage is reduced.

Description

technical field [0001] The invention relates to the field of hot rolling forming heat treatment, in particular to a manufacturing method for improving the performance of the surface layer of bearing steel balls. Background technique [0002] The main manufacturing methods of bearing steel balls include cold heading, hot heading, casting, rolling and other processes. The production efficiency of skew rolling steel balls saves materials and is suitable for mass production. Steel balls after cross-rolling need to be heat treated to eliminate network carbides and improve structural properties. At present, many steel ball manufacturing companies use one-way rotation to hot-roll steel balls. This one-way rolling method of the rolls causes the surface friction of the steel balls to cause the local metal plasticity of the steel ball surface (near the surface) to be exhausted, resulting in plasticity. damage. In addition, after the steel ball is hot-rolled, the temperature is lower...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21H1/16B21B45/02
CPCB21B45/0203B21H1/16
Inventor 邓松时大方吴浩邓杰刘彬
Owner DEQING TIANMA BEARING CO LTD
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