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Method for machining large-diameter super-thin-walled tubular product made of high-deformation materials

A processing method and large-diameter technology, applied in the field of metal processing and forming, can solve the problems of limited wall thickness reduction, weld seam reduction in overall performance, large wall thickness deviation, etc., to avoid coarse structure and inclusions, and strictly control The effect of refining the structure and strictly controlling the uniformity

Active Publication Date: 2015-06-17
有研金属复材技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using the traditional expanding drawing method to process large-diameter thin-walled pipes, the amount of wall thickness reduction is limited. After multi-pass drawing, the wall thickness deviation is large, and it is easy to exceed the tolerance. It is difficult to process large-diameter ultra-thin-walled pipes.
[0006] At present, my country's large-diameter ultra-thin-walled pipes are mainly processed by coil welding, but the existence of welds reduces their overall performance, and the product quality is poor, which makes it difficult to meet the requirements of advanced equipment upgrades.

Method used

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  • Method for machining large-diameter super-thin-walled tubular product made of high-deformation materials
  • Method for machining large-diameter super-thin-walled tubular product made of high-deformation materials
  • Method for machining large-diameter super-thin-walled tubular product made of high-deformation materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The specific steps for the preparation and processing of large-diameter ultra-thin-walled pipes are as follows:

[0041] (1) The processing object is Inconel690 nickel alloy large-diameter ultra-thin-wall pipe with a diameter of Ф500mm and a wall thickness of 0.5mm. Clean, polish and repair the surface defects of the pipe to obtain the pipe;

[0042] (2) Flare one end of the pipe obtained in step (1) on a press or spinning machine, the diameter of the flared part is Ф508mm, and then evenly apply lubricating oil on the inner and outer walls of the pipe and the die holes of the sizing die;

[0043] (3) Insert the unflared end of the pipe obtained in step (2) into the die hole of the sizing die. The die hole size of the sizing die is the same as the diameter of the pipe. The outer wall of the pipe is close to the die hole of the sizing die, and the center of the pipe is The line and center coincide with the center line and center of the sizing die. Then fix the expansion...

Embodiment 2

[0048] The specific processing steps are the same as in Example 1. The processing object is a large-diameter ultra-thin-walled pipe of Monel400 nickel alloy. The preparation and processing of the thin-walled pipe is the same as that of Example 1. The diameter of the Monel400 alloy pipe is Ф900mm and the wall thickness is 1mm. The diameter of the finished pipe is Ф900mm, the wall thickness is 0.8mm, and the ratio of diameter to thickness is 1125. Flare one end of the pipe on the spinning machine, and the diameter of the flared part is Ф920mm. The cone angle of the expansion mandrel is 15°, the length of the sizing belt is 50mm, and the drawing speed is 5mm / s. After three times of drawing, a pipe with a wall thickness of 0.85mm is obtained. The wall thickness of the pipe after the first drawing is 0.94mm, and the processing rate is 5.99%; the wall thickness of the pipe after the second drawing is 0.89mm, and the processing rate is 5.31%, and the wall thickness of the pipe after ...

Embodiment 3

[0050] The specific processing steps are the same as in Example 1. The processing object is a large-diameter ultra-thin-walled pipe of Monel400 nickel alloy. The preparation and processing of the thin-walled pipe is the same as in Example 1. The diameter of the Monel400 alloy pipe is Ф600mm and the wall thickness is 1.5mm. The diameter of the finished pipe is Ф600mm, the wall thickness is 0.6mm, and the ratio of diameter to thickness is 1000. Flare one end of the pipe on the press, and the diameter of the flared part is Ф610mm. Firstly, vacuum annealing is carried out through four-pass drawing; and then three-pass drawing is carried out to obtain a pipe with a wall thickness of 0.35 mm. Before vacuum annealing, the cone angle of the four-pass drawing expansion core is 30°, the length of the sizing belt is 30mm, and the drawing speed is 20mm / s; after vacuum annealing, the cone angle of the expansion core is drawn three times. The angle is 15°, the length of the sizing belt is ...

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Abstract

The invention discloses a method for mainly machining a large-diameter super-thin-walled high-precision tubular product with the diameter-thickness ratio larger than 1000, and belongs to the technical field of metal machining and forming. The method particularly comprises the steps that 1, surface defects of the tubular product are eliminated; 2, one end of the tubular product is expanded; 3, the non-expanded end of the tubular product is inserted into the die hole of a plug die, and an expanding core head is fixed to a core rod connected with a floating structure; 4, the expanding core head is moved downwards, a calibration bench of the expanding core head and a calibration bench of the plug die are kept on the same height, and the expanding core head is fixed; and 5, a chuck is adopted to clamp the expanded end of the tubular product, the chuck is moved upwards to draw the tubular product, and the large-diameter super-thin-walled seamless tubular product with the diameter-thickness ratio larger than 1000 is obtained. The large-diameter super-thin-walled high-precision tubular product machined through the method has the advantages of being light, high in strength and modulus, good in fatigue-resisting performance and the like, and has the wide application prospect in fields of aerospace, ships, nuclear power, automobiles and the like.

Description

technical field [0001] The invention belongs to the technical field of metal processing and forming, and in particular relates to a method for processing high-quality large-diameter ultra-thin-wall seamless pipes of difficult-to-deform materials, and obtains large-diameter ultra-thin-wall seamless pipes with a ratio of diameter to thickness (ratio of diameter to wall thickness) of more than 1000 High precision tubing. Background technique [0002] Difficult-to-deform materials such as nickel-based alloys, high-strength steels, titanium alloys, zirconium alloys, tungsten alloys, and discontinuously reinforced metal matrix composites have excellent performance, and have excellent and unique performance. Therefore, they are used in aviation, aerospace, weapons, ships, nuclear It is widely used in various fields such as industry, and is the material basis of modern advanced equipment. Large-diameter thin-walled pipes and special-shaped pipes made of hard-to-deform materials hav...

Claims

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Application Information

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IPC IPC(8): B23P15/00B21C1/24B21D41/02
CPCB21C1/24B21C37/06B21D41/02
Inventor 郭胜利
Owner 有研金属复材技术有限公司
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