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Method for expanding, drawing and forming metal pipe

A technology for metal pipes and pipes, which is applied in the direction of wire drawing dies, etc., can solve the problems of low dimensional accuracy, uneven deformation of inner and outer diameters, and uneven wall thickness reduction in the production of pipes, so as to improve the forming quality and forming efficiency and reduce the uneven expansion. Uniformity, the effect of improving the forming quality and forming accuracy

Active Publication Date: 2021-05-07
JIANGSU TOLAND ALLOY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems of uneven wall thickness thinning, uneven deformation of inner and outer diameters, low dimensional accuracy and low production efficiency of the produced pipe produced during the drawing process by the traditional drawing method

Method used

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  • Method for expanding, drawing and forming metal pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The first step is to polish the surface of the stainless steel tube. After the grinding is completed, use the prepared mixed acid solution for pickling treatment. After pickling, wash with water to remove the residual mixed acid on the stainless steel tube. Dry after washing;

[0033] In the second step, one end of the stainless steel tube is heat-treated, and the diameter is simply expanded in a hot state, so that the diameter of the stainless steel tube is larger than the maximum diameter of the expanding die, so that the expanding die can smoothly enter the interior of the stainless steel tube;

[0034] The third step is to inject stretching oil into the stainless steel pipe;

[0035] The fourth step is to place the stainless steel pipe on the machine tool through the guide device and the sizing device;

[0036] The fifth step is to pass the core rod through the stainless steel tube. The front end of the core rod is equipped with a detachable expanding die, and the r...

Embodiment 2

[0046] The first step is to polish the surface of the GH4169 tube. After the grinding is completed, use the prepared mixed acid solution for pickling treatment. After pickling, wash with water to remove the residual mixed acid on the GH4169 tube. After washing, dry it;

[0047] In the second step, one end of the GH4169 tube is heat treated, and the diameter is simply expanded in a hot state, so that the diameter of the GH4169 tube is larger than the maximum diameter of the expanding die, so that the expanding die can smoothly enter the inside of the GH4169 tube;

[0048] The third step is to introduce stretching oil into the GH4169 pipe;

[0049] The fourth step is to place the GH4169 pipe on the machine tool through the guide device and the sizing device;

[0050] The fifth step is to pass the core rod through the GH4169 tube. The front end of the core rod is equipped with a detachable expansion die, and the rear end of the core rod is connected to the drawing machine;

[00...

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Abstract

The invention relates to a method for expanding, drawing and forming a metal pipe. The method comprises the following steps that the surface of the pipe is polished, pickling is conducted by using a prepared mixed acid solution after the polishing, washing with water is conducted after the pickling, the mixed acid remained on the pipe is removed, and drying is conducted after the washing, one end of the to-be-expanded pipe is subjected to heat treatment and then is simply expanded in a heat state, so that the diameter of the to-be-expanded pipe is larger than the maximum diameter of an expanding mold, and the expanding mold can smoothly enter the interior of the pipe, drawing oil is introduced into the pipe, a protective oil film is formed on the inner wall of the pipe, and friction between the expanding mold and the inner wall is reduced, and the pipe penetrates through a guide device and a sizing device and is arranged on a machine tool.

Description

technical field [0001] The invention relates to a forming method for diameter-expanding and drawing of metal pipes, which belongs to the field of plastic processing and forming. Background technique [0002] Drawing processing is one of the important production methods of pipes and wires. It is a plastic forming method for forming parts by changing the cross section of pipes and wires. The products using the drawing process have good surface quality and precise dimensions, and can also improve the mechanical properties of the products, which has advantages that other plastic forming does not have. [0003] Expanding drawing is a drawing method that draws a smaller diameter tube blank into a larger diameter tube blank. Expanding drawing is usually used to produce thin-walled tubing with smaller sections. In the traditional drawing process, the radius of the pipe becomes larger, the wall thickness is thinner, and the length is shortened. In the drawing process, it mainly exp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/06B21C1/24B21C3/14
CPCB21C37/06B21C1/24B21C3/14
Inventor 李洪东王林涛刘春梅韦桂郑硕
Owner JIANGSU TOLAND ALLOY
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