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Manufacturing method of thin-wall chilled special-shaped pipe

A manufacturing method and technology of cold-hard special-shaped, applied in the field of seamless steel pipes, can solve the problems of low yield of special-shaped pipes, uneven weld surface, easy cracking, etc., and achieve the effect of improving yield and smooth weld surface

Active Publication Date: 2021-06-25
常熟市盈博钢管有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] During the production process of the special-shaped pipe, the four corners of the weld seam are easy to crack, which leads to the uneven surface of the weld seam, which makes the yield rate of the special-shaped pipe low

Method used

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  • Manufacturing method of thin-wall chilled special-shaped pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] When manufacturing special-shaped pipes with a wall thickness of 0.8mm

[0027] A method for manufacturing a thin-wall chilled special-shaped pipe, including adjusting and changing the plastic rebound coefficient and yield limit coefficient of the raw material when it enters the forming mold according to the thin-wall chilled thickness and Rockwell hardness of the raw material, and increasing the closed hole shape of the forming The thickness of the guide sheet, control the opening angle of the small guide and appropriately widen the width of the raw material.

[0028] Specific steps include:

[0029] 1) Raw material analysis: Choose raw materials that are appropriately widened compared with traditional raw materials, in order to ensure normal forming, welding and sizing.

[0030] Put the widened raw material into the storage bin through the loading rack, analyze the hardness and thickness of the widened raw material, thereby adjust and change the parameters when the w...

Embodiment 2

[0037] When manufacturing special-shaped pipes with a wall thickness of 0.9mm

[0038] A method for manufacturing a thin-wall chilled special-shaped pipe, including adjusting and changing the plastic rebound coefficient and yield limit coefficient of the raw material when it enters the forming mold according to the thin-wall chilled thickness and Rockwell hardness of the raw material, and increasing the closed hole shape of the forming The thickness of the guide sheet, control the opening angle of the small guide and appropriately widen the width of the raw material.

[0039] Specific steps include:

[0040] 1) Raw material analysis: Choose raw materials that are appropriately widened compared with traditional raw materials, in order to ensure normal forming, welding and sizing.

[0041] Put the widened raw material into the storage bin through the loading rack, analyze the hardness and thickness of the widened raw material, thereby adjust and change the parameters when the w...

Embodiment 3

[0048] When manufacturing special-shaped tubes with a wall thickness of 1 mm

[0049] A method for manufacturing a thin-wall chilled special-shaped pipe, including adjusting and changing the plastic rebound coefficient and yield limit coefficient of the raw material when it enters the forming mold according to the thin-wall chilled thickness and Rockwell hardness of the raw material, and increasing the closed hole shape of the forming The thickness of the guide sheet, control the opening angle of the small guide and appropriately widen the width of the raw material.

[0050] Specific steps include:

[0051] 1) Raw material analysis: Choose raw materials that are appropriately widened compared with traditional raw materials, in order to ensure normal forming, welding and sizing.

[0052]Put the widened raw material into the storage bin through the loading rack, analyze the hardness and thickness of the widened raw material, thereby adjust and change the parameters when the wid...

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Abstract

The invention discloses a manufacturing method of a thin-wall chilled special-shaped pipe. The manufacturing method comprises the following steps of: adjusting and changing parameters of raw materials entering a forming mold according to the hardness and the thickness of the raw materials; increasing the thickness of a formed closed hole type guide sheet; and controlling the size of an opening angle of a small guide and properly widening the width of the raw materials. With the adoption of the manner, the special-shaped pipe manufactured by the manufacturing method of the thin-wall chilled special-shaped pipe solves the problem that four corners of a welding line are easy to crack, so that the surface of the welding line of the special-shaped pipe is relatively flat and the yield is greatly improved.

Description

technical field [0001] The invention relates to the field of seamless steel pipes, in particular to a method for manufacturing thin-wall chilled special-shaped pipes. Background technique [0002] Special-shaped pipes are made of various special-shaped seamless steel pipes by cold drawing. Special-shaped pipes are generally distinguished according to the cross section. According to materials, they can be divided into seamless steel pipe special-shaped pipes, aluminum alloy special-shaped pipes, and plastic special-shaped pipes. [0003] Special-shaped seamless steel pipe is a general term for seamless steel pipes with cross-sectional shapes other than round pipes. Seam steel pipe (code-named BD), variable diameter special-shaped seamless steel pipe (code-named BJ). [0004] Special-shaped seamless steel pipes are widely used in various structural parts, tools and mechanical parts. Compared with round pipes, special-shaped pipes generally have a larger moment of inertia and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/15
CPCB21C37/155
Inventor 陈雪根
Owner 常熟市盈博钢管有限公司
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