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Production method of cold-drawn precise-inner hole honed tube

A manufacturing method and technology of cold-drawn pipe, applied in the direction of pipe, rigid pipe, pipe/pipe joint/pipe fitting, etc., can solve the problem of restricting the development of cold-rolled steel pipe, yield strength, dimensional deviation can not meet the use requirements, seamless steel pipe depends on imports and other problems, to achieve the effect of extending the service life, high rotational deformation resistance and wear resistance, and good low temperature impact toughness

Inactive Publication Date: 2015-04-29
WUXI JIANGNAN HIGH PRECISION COLD DRAWN PIPE
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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-rolled steel pipe in China

Method used

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  • Production method of cold-drawn precise-inner hole honed tube

Examples

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Comparison scheme
Effect test

Embodiment 1

[0022] Taking the preparation of a 27SiMn steel pipe with a diameter of 145.3mm and a hole wall thickness of 8.23mm as an example, the following steps are included:

[0023] (1) Heating: Heat the 27SiMn tube blank to 1200°C in a ring furnace for 4 hours to ensure uniform heating of the tube blank;

[0024] (2) Perforation: The heat pipe billet is pierced by a piercer, and the temperature of the capillary tube formed after piercing is controlled at 1150°C, and the perforation eccentricity is controlled at 4%. The pipe billet 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;

[0025] (3) Annealing: introduce the tube blank into a continuous annealing furnace for annealing, and control the annealing temperature to 600°C and the annealing time to 70 minut...

Embodiment 2

[0041] Taking the preparation of a 27SiMn steel pipe with a diameter of 136.9mm and a hole wall thickness of 8.29mm as an example, the following steps are included:

[0042] (1) Heating: Heat the 27SiMn tube blank to 1290°C in a ring furnace for 5 hours to ensure uniform heating of the tube blank;

[0043](2) Perforation: The heat pipe billet is pierced by a piercer, and the temperature of the capillary formed after piercing is controlled at 1230°C, and the perforation eccentricity rate is controlled at 4%. The pipe billet 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;

[0044] (3) Annealing: introduce the tube blank into a continuous annealing furnace for annealing, and control the annealing temperature to 720°C and the annealing time to 90 minute...

Embodiment 3

[0057] Take the preparation of a 27SiMn steel pipe with a diameter of 147.4mm and a hole wall thickness of 8.02mm as an example, including the following steps:

[0058] (1) Heating: Heat the 27SiMn tube billet to 1250°C in a ring furnace for 4.5 hours to ensure uniform heating of the tube billet;

[0059] (2) Perforation: The heat pipe blank is pierced by a piercer, and the temperature of the capillary tube formed after perforation is controlled at 1200°C, and the perforation eccentricity rate 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;

[0060] (3) Annealing: introduce the tube blank into a continuous annealing furnace for annealing, and control the annealing temperature t...

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Abstract

The invention relates to a production method of a cold-drawn precise-inner hole honed tube. The production method includes heating a tube blank in a circular furnace; punching a heat tube by the aid of a puncher; subjecting the tube blank to annealing; spraying the tube blank with sodium borate to remove oxide skin; leading the annealed tube blank into a tube mill for hot milling; separating the milled tube and a mandrel; performing stress relieving, to be specific, leading the milled tube into a heating furnace to obtain an annealed tube blank; performing acid dipping on the tube blank to remove scale of the surface; subjecting the tube blank to parkerizing, and accordingly a chemical coating of zinc phosphate is generated on the surface of the tube blank; performing saponification to form lubricating coatings such as metallic soap; subjecting the tube blank to be cold drawn to cold drawing, and the cold-drawn tube is achieved; performing heating on the cold-drawn tube to decrease residual stress; adopting a CNC honing machine to hone the cold-drawn tube; subjecting the cold-drawn tube to heat straightening, and the cold-drawn precise-inner hole honed tube is achieved. The cold-drawn precise-inner hole honed tube made in the way is good in comprehensive performance and low-temperature impact toughness, has precise size and smooth surface and is good in oil storage effect.

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 cold-drawn precision 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 steel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
CPCB23P15/00F16L9/02
Inventor 支向军
Owner WUXI JIANGNAN HIGH PRECISION COLD DRAWN PIPE
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