Rotating and straightening method using metal pipe tension

A metal tube and tension technology, applied in the field of straightening of bending deformation, can solve problems such as scratches or indentations on the surface of metal tubes, and achieve the effect of effective straightening

Inactive Publication Date: 2009-04-22
SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The problem with this technology is that it will scratch or indent the surface of the metal tube, and even make the metal tube oval

Method used

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  • Rotating and straightening method using metal pipe tension

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Material: Stainless steel tube, annealed condition. The diameter is 10mm, the pipe wall is 08mm, and the pipe length is 1.5m.

[0011] Straightening equipment: self-made, modified with machine tools. The thimble of the tailstock of the machine tool is changed to chuck 1, and the two ends of the metal pipe 3 are clamped by two chucks at the front and rear (in order to prevent deformation of the metal pipe at the clamping position of the chuck and to have sufficient clamping force, the clamped part at both ends The mandrel should be added to the metal tube and then clamped). A set of hydraulic device is designed, and the hydraulic cylinder 2 piston is pressed against the tailstock to form a stretching tension on the metal pipe. The equipment structure diagram is as follows: figure 1 shown.

[0012] Straightening method: the active chuck drives the metal pipe to rotate, the speed is 1500 rpm, and the tensile tension is 7KN (for this purpose, the pipe reaches the limit ...

Embodiment 2

[0015] Material: Copper tube, annealed condition. The diameter is 6mm, the tube wall is 1mm, and the tube length is 1.5m.

[0016] Straightening equipment is the same as embodiment 1.

[0017] Straightening method: the active chuck drives the metal tube to rotate, the speed is 1100 rpm, and the tensile tension is 1.4KN (for this purpose, the tube reaches the limit of bending. This tension is obtained by testing the same material on a mechanical tensile testing machine), straightening The straight time is 15 seconds.

[0018] Straightening accuracy: The radial runout of the metal pipe after being straightened is less than 0.5 / 1000mm.

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PUM

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Abstract

The invention relates to the straightening of the bending deformation generated during the manufacturing, processing, storing and transporting of a metal pipe. The method is to rotationally straightening with a tensile force of the metal pipe and comprises: a clipping device clips both ends of the metal pipe to enable the tensile force of the metal pipe material reach a yield limit; at the same time, the clipping device drives the metal pipe to rotate together at a proper speed. In the method, only both ends of the metal pipe are clipped so as to bend the metal pipe and enable the metal pipe material to generate a tensile force of the yield limit; at the same time, the metal pipe also rotates continuously to equalize moment all parts, without causing deformation of the metal pipe; therefore, the straightening method straightens the metal pipe effectively, without scraping the surface of the metal pipe.

Description

technical field [0001] The invention relates to a straightening method without contacting the surface of a metal pipe, in particular aimed at straightening the bending deformation of the metal pipe during production, processing, storage and transportation. Background technique [0002] In order to straighten metal pipes, there are many kinds of straightening machines in the production field at present, such as the patent of single-roller convex-concave three-roller thin-walled pipe straightening machine with application number 87200790. The straightening part is a single-roller group supporting one convex roller and two Three-roll leveling machine composed of concave rolls. Application No. is 89107356.6 patent for composite hub type straightening machine, its main feature is that a two-roller hub coaxially and counter-rotating with the rolling mode hub is connected in series between the rolling die hub and the lead roller. A metal pipe straightening die patent with applicat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D3/00
Inventor 茅云辉田为全周丽文
Owner SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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