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Manufacturing method for high-precision cold-drawn inner-hole honed pipe

A manufacturing method and high-precision technology, applied in the field of steel pipe preparation, can solve the problems of dependence on imports of seamless steel pipes, restricting the development of cold-drawn steel pipes, yield strength, and dimensional deviation can not meet the requirements of use, etc., and achieve high rotational deformation resistance and wear resistance. good performance, low temperature impact toughness and good oil storage performance

Inactive Publication Date: 2016-08-24
WUXI SHENLU HYDRAULIC PARTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the drawing processing method performed by a drawing machine can efficiently manufacture cold-worked steel pipes compared with the rolling processing method performed by a pilger rolling machine. This seamless steel pipe is used for hydraulic cylinders and pneumatic cylinders. At present, the yield strength and dimensional deviation of the highest steel grade stipulated by the current domestic standards cannot meet the actual requirements for the use of hydraulic cylinders and pneumatic cylinders, so that my country's seamless steel pipes for hydraulic cylinders and pneumatic cylinders can only rely on imports. Restricted the development of cold drawn steel pipe in our country

Method used

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  • Manufacturing method for high-precision cold-drawn inner-hole honed pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Taking the preparation of a 27SiMn steel pipe with a diameter of 159.3mm and a hole wall thickness of 6.3mm as an example, the following steps are included:

[0021] (1) Heating: Heat the 27SiMn tube blank to 1300°C in a ring furnace for 4 hours to ensure uniform heating of the tube blank;

[0022] (2) Perforation: The heat pipe blank is pierced by a piercer, and the temperature of the capillary tube formed after the piercing is controlled at 1250°C, and the perforation eccentricity is controlled at 4%. The tube blank is visually inspected to remove the burrs on the surface of the tube blank, Warped skin, if there are obvious pits, scratches and cracks that are visible to the naked eye on the surface of the tube blank, they should be removed to avoid flowing into the next process to control the surface quality of the tube blank;

[0023] (3) Annealing: introduce the tube blank into a continuous annealing furnace for annealing, and control the annealing temperature to 60...

Embodiment 2

[0037] Taking the preparation of a 27SiMn steel pipe with a diameter of 139.9mm and a hole wall thickness of 7.9mm as an example, the following steps are included:

[0038] (1) Heating: Heat the 27SiMn tube blank to 1380°C in a ring furnace for 5 hours to ensure uniform heating of the tube blank;

[0039] (2) Perforation: The heat pipe blank is pierced by a piercer, and the temperature of the capillary tube formed after perforation is controlled at 1350°C, and the perforation eccentricity is controlled at 5%. The tube blank is visually inspected to remove burrs, Warped skin, if there are obvious pits, scratches and cracks that are visible to the naked eye on the surface of the tube blank, they should be removed to avoid flowing into the next process to control the surface quality of the tube blank;

[0040] (3) Annealing: introduce the tube blank into a continuous annealing furnace for annealing, and control the annealing temperature to 700°C, and the annealing time to 90min, ...

Embodiment 3

[0051] Taking the preparation of a 27SiMn steel pipe with a diameter of 140.4mm and a hole wall thickness of 8.3mm as an example, the following steps are included:

[0052] (1) Heating: Heat the 27SiMn tube billet to 1350°C in a ring furnace for 4.5 hours to ensure uniform heating of the tube billet;

[0053] (2) Perforation: The heat pipe blank is pierced by a piercer, and the temperature of the capillary tube formed after perforation is controlled at 1300°C, and the perforation eccentricity rate is controlled at 4.5%. The tube blank is visually inspected to remove the burrs on the surface of the tube blank, Warped skin, if there are obvious pits, scratches and cracks that are visible to the naked eye on the surface of the tube blank, they should be removed to avoid flowing into the next process to control the surface quality of the tube blank;

[0054] (3) Annealing: introduce the tube blank into a continuous annealing furnace for annealing, and control the annealing tempera...

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Abstract

The invention relates to a manufacturing method for a high-precision cold-drawn inner-hole honed pipe. The manufacturing method includes the following steps of heating, i.e., heating a tube blank in a circular furnace; perforation, i.e., perforating the hot tube blank through a perforating machine; annealing, i.e., annealing the tube blank; cold rolling, i.e., leading the annealed tube blank into a tube rolling mill for cold rolling to obtain a rolled tube; stress relief annealing, i.e., leading the rolled tube into a heating furnace for heating to obtain an annealed tube blank; acid pickling, i.e., carrying out acid pickling on the annealed tube blank to remove rust scale on the surface; phosphating, i.e., forming a chemically-generated zinc phosphate covering film on the surface of the tube blank; saponification, i.e., forming metallic soap and the like on the covering film to lubricate the covering film; cold drawing, i.e., carrying out cold drawing on the tube blank to be cold-drawn to obtain a cold-drawn tube; heat treatment, i.e., reducing residual stress of the cold-drawn tube through the quenching-tempering heat treatment process; honing, i.e., carrying out honing with a numerically controlled honing machine; and hot straightening treatment, i.e., carrying out hot straightening treatment to obtain a high-precision cold-drawn steel tube. The precision inner-hole honed tube which is high in yield strength, precise in dimension and smooth in surface is obtained by means of the method.

Description

technical field [0001] The invention belongs to the technical field of steel pipe preparation, and in particular relates to a method for manufacturing a high-precision cold-drawn inner hole honing pipe. Background technique [0002] As cold working methods of steel pipes for machine structural use such as carbon steel, alloy steel, or stainless steel, there are known drawing methods by a drawing machine and rolling methods by a pilger mill. Among them, the drawing processing method performed by a drawing machine can efficiently manufacture cold-worked steel pipes compared with the rolling processing method performed by a pilger rolling machine. This seamless steel pipe is used for hydraulic cylinders and pneumatic cylinders. At present, the yield strength and dimensional deviation of the highest steel grade stipulated by the current domestic standards cannot meet the actual requirements for the use of hydraulic cylinders and pneumatic cylinders, so that my country's seamless ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
Inventor 吴建兴
Owner WUXI SHENLU HYDRAULIC PARTS
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