Method for manufacturing steel pipe for bearing ring

A technology of bearing rings and steel pipes, which is applied in the direction of manufacturing tools, heat treatment equipment, furnaces, etc., can solve the problems of undisclosed mature technical information of steel pipes, and achieve the effect of avoiding waste of raw materials

Inactive Publication Date: 2012-08-08
常熟市旋力轴承钢管有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, no mature technical information on preparing steel pipes for bearing rings from GCr15 bearing steel rods has been disclosed so far in both published patents and non-patent literature.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take the steel pipe used to prepare the bearing ring of 42.9×6.9 (outer diameter 42.9 mm, wall thickness 6.9 mm) as an example.

[0028] A) Heating and piercing, sending the GCr15 bearing steel bar with a diameter of φ60 (60㎜), that is, the round steel, into the heating furnace to heat it to 1120°C, and piercing at this 1120°C, the eccentricity of the round steel when piercing Less than 8%, forced air cooling with a fast fan after perforation, to avoid cooling too slowly and causing network carbides on the surface, to obtain a 63×8㎜ (outer diameter 63㎜, wall thickness 8㎜) waste tube, and It should be ensured that the outer wall and hole wall of the waste pipe have no obvious pits, scratches, peeling and peeling layers that are visible to the naked eye;

[0029] B) Annealing. This annealing step can also be called spheroidizing heat treatment. The blank tube obtained in step A) is introduced into a continuous annealing furnace for annealing, that is, spheroidizing ...

Embodiment 2

[0038] Take the steel pipe used to prepare 64×7.35 (outer diameter 64mm, wall thickness 7.35mm) bearing rings as an example.

[0039] A) Heating and piercing, sending the GCr15 bearing steel bar with a diameter of φ90 (90㎜), that is, the round steel, into the heating furnace and heating it to 1120°C, and piercing at this 1120°C, the eccentricity of the round steel when piercing Less than 8%, forced air cooling with a fast fan after perforation, to avoid the appearance of network carbides on the surface due to slow cooling, and obtain a 92×8.5mm (outer diameter 92mm, wall thickness 8.5mm) blank tube, and It should be ensured that the outer wall and hole wall of the waste pipe have no obvious pits, scratches, peeling and peeling layers that are visible to the naked eye;

[0040] B) Annealing. This annealing step can also be called spheroidizing heat treatment. The blank tube obtained in step A) is introduced into a continuous annealing furnace for annealing, that is, spher...

Embodiment 3

[0048] Take the steel pipe used to prepare the bearing ring of 29.1×6.4 (outer diameter 29.1mm, wall thickness 6.4mm) as an example.

[0049] A) Heating and piercing, put the GCr15 bearing steel bar with a diameter of φ55 (55㎜), that is, the round steel, into the heating furnace and heat it to 1120°C, and perforate at this 1120°C, the eccentricity of the round steel when piercing Less than 8%, forced air cooling with a fast fan after perforation, in order to avoid the appearance of network carbides on the surface due to too slow cooling, and obtain a blank tube of 57×7.2㎜ (outer diameter 57㎜, wall thickness 7.2㎜), and It should be ensured that the outer wall and hole wall of the waste pipe have no obvious pits, scratches, peeling and peeling layers that are visible to the naked eye;

[0050] B) Annealing. This annealing step can also be called spheroidizing heat treatment. The blank tube obtained in step A) is introduced into a continuous annealing furnace for annealing, ...

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Abstract

The invention discloses a method for manufacturing a steel pipe for a bearing ring, belonging to the technical field of manufacturing of steel pipes. The method comprises the following steps of: perforating a bearing steel bar material in a heated state, and quickly cooling after perforation to obtain a pierced billet; introducing the pierced billet into an annealing furnace for annealing to obtain an annealed pierced billet; introducing the annealed pierced billet into a cold rolling mill for performing cold rolling to obtain a cold-rolled pipe blank; introducing the cold-rolled pipe blank into the annealing furnace for performing relief annealing to obtain a stress-relieved pipe blank; washing the stress-relieved pipe blank with acid, and phosphorizing treatment to obtain a pipe blank to be subjected to cold drawing; performing cold drawing on the pipe blank to be subjected to cold drawing, and controlling the cold drawing extension multiple to obtain a cold-drawn pipe; and introducing the cold-drawn pipe into a continuous annealing furnace for performing finished product thermal treatment, controlling the thermal treatment temperature and heat preserving time of a finished product, cooling along with the furnace after heat preservation is completed, and discharging to obtain the steel pipe for the bearing ring. The method has the advantages that: the technical requirements of the bearing ring manufactured with a cold rolling process can be met; and the method has simple process steps, and can meet the requirement of industrial mass production.

Description

technical field [0001] The invention belongs to the technical field of steel pipe preparation, in particular to a method for preparing steel pipes for bearing rings . Background technique [0002] The bearing ring mentioned above is a general term for the inner ring of the bearing and the outer ring of the bearing, and it is customary to refer to the steel pipe used for the bearing ring as the bearing steel pipe, and then to call the steel used for the bearing steel pipe as the bearing steel. Bearing steel is usually divided into three types according to its chemical composition and mass percentage: one is high-carbon chromium bearing steel, and its grade or steel number is such as GCr15, GCr6, GCr9, GCr9SiMn and GCr15SiMn; the other is carburized bearing steel, Its grades are G20CrMo, G20CrNiMo, G20CrNi2Mo, G20Cr2Ni4 and G10CrNi13Mo; the third is stainless steel bearing steel, its grades are 9Cr18 and 9Cr18Mo. [0003] In the prior art, the bearing ring is usually obt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/06C21D9/08C21D1/30C21D8/10
Inventor 顾铭李伟国龚建峰金惠明密燕芳王雪亚
Owner 常熟市旋力轴承钢管有限公司
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