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Composite joining method of magnesium alloy/carbon steel pipe fittings based on induction heating and electromagnetic forming

A technology of electromagnetic forming and induction heating, which is applied in the direction of welding/welding/cutting objects, welding equipment, non-electric welding equipment, etc., which can solve the problems of limited product size, poor mechanical properties, and low yield rate, and facilitates automatic control , Improving connection efficiency and improving the effect of connection forming performance

Active Publication Date: 2017-10-24
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main processing method of magnesium alloy is die casting, but the magnesium alloy products after plastic processing have a broader application prospect. Although the casting performance of magnesium alloy is excellent, it can be cast into various parts with complex shapes, but there are also product specifications and sizes. Limited, poor mechanical properties and other limitations, various casting defects such as porosity, porosity, shrinkage cavity and inclusions are difficult to avoid, too thin wall thickness will easily lead to product scrapping, and the yield is low, and shaping processing can not only increase production, but also Can give the product more excellent mechanical properties

Method used

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  • Composite joining method of magnesium alloy/carbon steel pipe fittings based on induction heating and electromagnetic forming
  • Composite joining method of magnesium alloy/carbon steel pipe fittings based on induction heating and electromagnetic forming
  • Composite joining method of magnesium alloy/carbon steel pipe fittings based on induction heating and electromagnetic forming

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Embodiment 1

[0029] Embodiment 1. Magnesium alloy / carbon steel pipe fitting composite connection method based on induction heating and electromagnetic forming

[0030] The composite connection method of magnesium alloy / carbon steel pipe fittings based on induction heating and electromagnetic forming, see figure 1 Specifically, the electromagnetic induction heating coil and the electromagnetic forming coil are the same coil device, and the charging of the capacitor of the electromagnetic forming machine and the heating process of the magnesium alloy inner tube by electromagnetic induction heating can be carried out simultaneously. First, the capacitor 4 is charged through the control circuit of the electromagnetic forming machine, and the second vacuum switch 6 is turned on at the same time, so that the electromagnetic induction heating device can realize the heating of the inner tube of the magnesium alloy. Through process control, when the charging of the capacitor 4 is completed, the magn...

Embodiment 2

[0045] Example 2 Using AZ31 magnesium alloy tubes as a thermomagnetic pulse connection experiment

[0046] 1. Experimental process:

[0047] (1) Material preparation:

[0048] The materials used in the experiment are commercially available AZ31 magnesium alloy pipes and 20 carbon steel, and the chemical composition of the magnesium alloy is shown in Table 1. The magnesium alloy tube used in the experiment is annealed, the annealing temperature is 300°C, and it is cooled with the furnace after holding for 0.5h.

[0049] (2) Forming process:

[0050] Magnetic pulse connection test in such as image 3 Carried out on the tooling structure shown. The electromagnetic forming coil used in the experiment is as Figure 4 and Figure 5 As shown, the coil interface is a rectangle of 2×5 mm, which is machined from a copper tube, the number of coil turns is n=20, the outer diameter of the coil is 80 mm, the inner diameter D is 78 mm, and the width is 60 mm. The pipe fittings are 1mm...

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Abstract

The invention relates to a magnesium alloy / carbon steel pipe composite connection method based on induction heating and electromagnetic forming. A warm electromagnetic forming method is utilized to increase the magnesium alloy forming performance, additionally, electromagnetic induction heating and electromagnetic forming are combined, the induction heating and forming functions are realized by utilizing a same coil, so as to increase the connecting efficiency of a heterogeneous metal tube and facilitate the automation control, and additionally, a warm forming process and an electromagnetic forming process are combined during forming, so that the connecting forming performance is increased. According to the magnesium alloy / carbon steel pipe composite connection method, a magnesium alloy pipe is overlapped with a carbon steel pipe, and after the magnesium alloy inner pipe reaches the set temperature through the electromagnetic induction heating of the coil, the magnesium alloy inner pipe is discharged by the electromagnetic forming coil, so that severe plastic deformation of the magnesium alloy inner pipe occurs, and the magnesium alloy inner pipe after plastic deformation collides and connects with an outer pipe. According to the method, the electromagnetic forming coil is instantaneously discharged through an energy storage capacitor, so as to generate a strong pulsed magnetic field, so that the warm inner pipe is formed at high speed under the action of electromagnetic force and collides with the carbon steel outer pipe with higher rigidity at high speed to generate combination.

Description

technical field [0001] The invention relates to an electromagnetic connection technology for dissimilar metal alloy pipe fittings, specifically an induction heating and electromagnetic forming composite connection method for lap joints of magnesium alloy / carbon steel pipe fittings, which is mainly used in the connection technology of magnesium alloy pipe fittings and carbon steel pipe fittings. Background technique [0002] In recent years, the problems of environmental pollution and resource consumption have become increasingly serious. With the rapid development of the automobile industry, automobile exhaust emissions and fuel utilization have increasingly attracted social attention, and automobile lightweight has become the development trend of the automobile industry. Lightweight, The application of high-strength difficult-to-form materials in advanced manufacturing fields such as automobiles, aviation, and aerospace is increasing. [0003] Magnesium and its alloys are ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K20/06B23K20/26B23K103/18
CPCB23K20/06B23K20/227B23K2103/18
Inventor 孟正华杨鹏黄尚宇雷雨胡建华
Owner WUHAN UNIV OF TECH