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Straightening method and apparatus for small-diameter thin-wall metal tube

A technology for straightening metal pipes, which is applied in the field of straightening devices for thin-diameter and thin-walled metal pipes, can solve problems such as high vacuum, large capillary waste products, difficult bright treatment, etc., and achieves simple and flexible operation, simple equipment, and straightening high intensity effect

Active Publication Date: 2009-02-04
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

2) The degree of vacuum is very high: otherwise, it will be difficult to brighten the inner and outer walls of the capillary after oxidation, and even if it can be processed, it will have a significant adverse effect on the control of geometric dimension accuracy
3) Straightening and elongation must be strictly controlled: otherwise, if the geometric size of the capillary is out of tolerance, a large amount of waste products will be caused and cannot be saved

Method used

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  • Straightening method and apparatus for small-diameter thin-wall metal tube

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Experimental program
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Embodiment

[0021] Open the vacuum shell, fix the Φ2mm×0.15 titanium alloy capillary material on the workpiece chuck 4, close the vacuum shell, start the vacuum pump, observe the pressure gauge, and start the thyristor adjustment after the vacuum reaches the requirement (below 1Pa) Press the pressure device to gradually apply current to 50A (voltage 40V) to both ends of the pipe. When the heating requirement is reached (the surface turns reddish), start the continuously variable motor, adjust the motor speed to drive the screw to move in the radial direction 1- 10mm (the longitudinal extension of the pipe is less than 2%), the lead screw drives the round screw to the workpiece chuck, and the workpiece chuck then drives the capillary material to move slowly in the radial direction. During the period, check the straightening situation through the observation window at any time. After the straightening is finished Turn off the thyristor pressure regulator, wait for the temperature of the pipe ma...

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Abstract

The invention relates to a method for aligning the fine-diameter fine-wall metal tube, wherein the invention is characterized in that: it puts fine-diameter fine-wall metal tube into vacuum frame, heats it with thermal current, and functions drawing force at two ends to align it. And it can thermally align the high-flexibility high-strength fine-diameter fine-wall tube at vacuum condition, to align several tubes at one time, as TiNi memory alloy, CoCrMo alloy, etc, and the tube whose outer diameter is smaller than 3mm.

Description

Technical field [0001] A straightening device for thin-diameter and thin-walled metal pipes relates to a device used for straightening and shaping high-elasticity and high-strength metal thin-diameter and thin-walled capillary pipes. Background technique [0002] At present, the straightening of metal pipes can be completed by traditional methods such as multi-roll precision straightening machine, flexible straightening, and tension straightening. The working area of ​​the multi-roll precision straightening machine is composed of multiple steel rollers. While the workpiece rotates around its axis, it moves forward. It passes through multiple bends between the hyperbolic rollers at a certain angle to the forward direction of the pipe, making it gradually It is straightened, but the straightening of thin-walled tubes with an outer diameter of Φ3mm or less and a wall thickness between 0.05 and 0.2mm cannot be completed. Flexible straightening is that a bendable hollow core hose is d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D3/00
Inventor 于振涛牛金龙皇甫强袁思波何新杰刘少辉
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH