High-strength aluminium, magnesium alloy equi-temperature extrusion method based on numerical simulation

An isothermal extrusion and numerical simulation technology, applied in the field of material science, can solve the problems of large deformation, long time consumption, and grid distortion in the simulation process, so as to reduce the deformation of stretching and straightening, improve dimensional stability, extend the The effect of service life

Active Publication Date: 2007-11-14
HUNAN UNIV
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  • Description
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  • Application Information

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Problems solved by technology

[0006] Recently, there have also been reports on the use of computer simulation to obtain the isothermal extrusion process, but for extrusion processing, due to the large amount of deformation, the mesh distortion in the simulation ...

Method used

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  • High-strength aluminium, magnesium alloy equi-temperature extrusion method based on numerical simulation
  • High-strength aluminium, magnesium alloy equi-temperature extrusion method based on numerical simulation
  • High-strength aluminium, magnesium alloy equi-temperature extrusion method based on numerical simulation

Examples

Experimental program
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Effect test

Embodiment 1

[0061] Isothermal Control Simulation of AZ31 Magnesium Alloy Cross Profile Flat Die Non-lubricated Extrusion Process. The maximum target temperature T0 of the selected workpiece is 400°C, the initial temperature of the billet is 350°C, and the temperature of the extrusion tools (extrusion barrel, extrusion pad and die) is set to 300°C. The initial extrusion speed was set at 8 mm / s. After 1000 steps of simulation calculation, the workpiece starts to extrude from the mold, and the maximum temperature of the workpiece rises rapidly to 401°C at step 1230, and PID control is started to be added at this time. In the early stage of control, due to large temperature changes, the sampling period should be as short as possible to improve control accuracy and control continuity. The period is 20 steps, corresponding to the displacement of the extrusion axis S = 0.4mm. When the extrusion reaches 3000 steps, the cycle is taken as 50 steps, which corresponds to the extrusion axis displacem...

Embodiment 2

[0065] Isothermal Control Simulation of Extrusion Process of AZ31 Magnesium Alloy Hollow Square Tube with Split Die with Wall Thickness of 1.5 mm. Select the target temperature value at 4mm of the workpiece exit to be 400°C, the initial temperature of the billet is 350°C, the temperature of the extrusion tool (extrusion barrel, extrusion pad and die) is set to 300°C, and the initial extrusion speed is 3mm / s. When the simulation reaches step 1700, the workpiece is filled with the welding chamber, and the workpiece begins to extrude from the die, and the temperature of the workpiece rises rapidly. The cycle takes 100 steps, that is, the extrusion axis displacement S=0.2mm. The exit temperature of square tube extrusion is more sensitive to the change of extrusion speed, so the proportional parameter K P smaller. while using only K P When the value is controlled, there is still a static difference in the whole process, and the control cannot reach a steady state. So add inte...

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Abstract

The present invention provides a high-strength aluminium and magnesium alloy isothermal extrusion method based on numerical analog. Said method is characterized by that it utilizes PID control principle and makes it be applied for extrusion deformation finite element analog modeling, and utilizes once analogy of deformation process of workpiece to be machined to accurately and effectively obtain isothermal extrusion speed curve. According to the property of workpiece to be machined the workpiece outlet object outlet temperature, the extrusion speed can be regulated according to the PID control principle so as to obtain analog isothermal extrusion speed change curve correspondent to the described workpiece to be machined, and said isothermal extrusion speed change curve obtained by means of analogy can be inputted into the control system of extruding machine to control speed of main plunger of extruding machine so as to make extrusion outlet temperature retain constant.

Description

technical field [0001] The invention relates to a material processing method in the field of material science and technology, in particular to isothermal extrusion control in the hot extrusion processing of high-strength magnesium and aluminum alloys. Background technique [0002] Extrusion is a plastic processing method that applies external force to the metal blank placed in the container (extrusion cylinder) to make it flow out of a specific die hole to obtain the required cross-sectional shape and size. Non-ferrous metals such as aluminum and magnesium have a series of advantages such as low density and high strength, making them more and more important in the fields of automobiles, electronics, construction, aviation and industry. The extrusion method is an important production method for processing such metal products. [0003] In extrusion processing, the extrusion exit temperature (namely the maximum temperature) is a parameter that people are most concerned about. ...

Claims

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Application Information

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IPC IPC(8): B21C31/00B21C23/00G05B19/05G05B11/42
Inventor 李落星胡基贵张辉栾娜胡文俊黄长清
Owner HUNAN UNIV
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