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Method for using numerically-controlled pipe bender to process heating constant temperature bending pipe

A tube bending machine and constant temperature technology, which is applied in the field of plastic processing, can solve the problems of low forming precision, repeated preheating of the mold, and difficult temperature control, etc., and achieve the effect of high forming precision

Inactive Publication Date: 2008-05-28
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] After searching the existing technical documents, it was found that the Chinese invention patent: a magnesium alloy tube hot bending method and equipment, publication number: CN 1709607A, the method is to use the internal resistance of the tube itself to heat the section to be bent after energization, and then The process of bending and forming on a preheated manual bending machine. This method is not easy to control the temperature during bending. During batch operations, the mold needs to be preheated repeatedly, relying on the filler in the tube to ensure the shape requirements of the bending section, and the filler needs to be removed after bending. The cleaning and bending process is carried out manually, the forming accuracy is not high, and the production efficiency is low, so this method is not suitable for large-scale automatic precision hot bending of pipes

Method used

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  • Method for using numerically-controlled pipe bender to process heating constant temperature bending pipe

Examples

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Effect test

Embodiment 1

[0027] In this example, a mold with a bendable diameter of Φ25mm and a wall thickness of 1.9mm is used. The bending radius is 75mm. The selected pipe is an AZ31 magnesium alloy shunt extruded pipe. The bending temperature is set at 150°C and the bending angle is 90°. The bending speed is 3r / min. When the temperature of the mold reaches 150°C, install the pipe. Within 3 minutes, the surface temperature of the pipe reaches 150°C. Start the pipe bender to complete the bending process. No cracking, no wrinkles on the inner arc surface, the maximum wall thickness reduction rate is 13%, the maximum ellipticity of the cross-section is 2.5%, and the rebound rate is 3.5% when released, which meets the use requirements.

Embodiment 2

[0029]In this example, a mold with a bendable diameter of Φ42mm and a wall thickness of 4mm is used. The bending radius is 84mm. The selected pipe is AM30 magnesium alloy shunt extruded pipe. The speed is 5r / mim, the mold is heated from room temperature to 200°C within 5 minutes, the pipe is installed and kept warm, and the surface temperature of the pipe reaches 200°C within 3 minutes, and the bending process is completed by starting the pipe bender. Sliding, no cracking on the outer side of bending, no wrinkling on the inner side, the maximum wall thickness reduction rate is 11.6%, the maximum ellipticity of the cross-section is 1.6%, and the rebound rate when released is 2%, which meets the use requirements.

Embodiment 3

[0031] In this example, a die with a bendable diameter of Φ42mm and a wall thickness of 2mm is used. The bending radius is 84mm. The selected pipe is AZ31 magnesium alloy shunt extruded pipe. The speed is 1r / mim, the mold is heated from room temperature to 250°C within 6 minutes, the pipe is installed and kept warm, and the surface temperature of the pipe reaches 250°C within 3 minutes, the bending process is completed by starting the pipe bender, and the inner and outer surfaces of the pipe are bent and deformed No slipping, no cracking on the curved outer arc surface, no wrinkling on the inner arc surface, the maximum wall thickness reduction rate is 12.8%, the maximum ellipticity of the cross-section is 1%, and the rebound rate when released is 1.2%, which meets the use requirements.

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Abstract

The invention discloses a method making use of numerical control tube bender to heat constant temperature bent tube in the material technology field. The method has the detail steps that a hole is cut on a height direction in the internal part of a round die, and holes are respectively cut on a height direction in the internal parts of a guide die, an anti-crease die and a mandril. A heating medium and a temperature sensor are respectively arranged in the holes. Insulation medium is arranged on the touch area of the lower surface of the round die and a machine body, on the clinching area of the back face of the guide die and a slide block and on the contacting area of the anti-crease die and a support frame thereof. The heating medium and the temperature sensor are respectively connected with a temperature control system which consists of a digital-display temperature control instrument and a solid relay. A temperature control instrument controls the opening and closing of the solid relay through comparing a self-set value with a collected value by the temperature sensor so as to realize a temperature control to the die; the tubes are hot bended -for molding. The invention realizes heating bending in a constant temperature for tubes which are difficult to be transfigured with high shaping accuracy, and is suitable for a batch production.

Description

technical field [0001] The invention relates to a plastic processing method in the technical field of materials, in particular to a method for heating and constant-temperature pipe bending by using a numerical control pipe bending machine. Background technique [0002] Due to the advantages of light weight and high strength, metal pipes are widely used in the manufacture of structural parts in the fields of machinery and automobiles, and can also be used as carriers for the transmission of various fluid media. The supply status of the pipes is mostly straight pipes. In practical applications, pre-bending processing is required in many occasions. Different processing methods can be selected according to the requirements of the use. Among them, the CNC pipe bender can accurately and smoothly bend the pipes according to the requirements. Processing, high forming precision, good process stability, suitable for precision bending of various pipes. At present, the common CNC pipe ...

Claims

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Application Information

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IPC IPC(8): B21D9/18B21D9/05B21D9/12B21D37/10B21D37/12
Inventor 吴文云张平姚寿山靳丽丁文江
Owner SHANGHAI JIAO TONG UNIV
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