A method and device for machining metal materials based on pulse current

A metal material, pulse current technology, applied in accessories, electric processing equipment, metal processing equipment, etc., can solve the problem of difficult to promote industrialized products of large workpieces, eliminate residual stress and unidirectional coarse columnar crystals, and improve mechanical properties. , the effect of refining the material organization

Active Publication Date: 2022-08-09
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the process of pulse current treatment, its effects can be roughly divided into thermal effect and non-thermal effect, and the stronger the non-thermal effect, that is, the greater the current density and the shorter the time, the better the material structure and performance. Therefore, in order to obtain a good The processing effect of this method often requires a large-capacity power supply and a high-power electrical device, but the existing research is still limited to small-sized samples in the laboratory, and it is difficult to promote it to industrial products with large workpieces.

Method used

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  • A method and device for machining metal materials based on pulse current
  • A method and device for machining metal materials based on pulse current
  • A method and device for machining metal materials based on pulse current

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The 22MnB5 steel material whose length, width and height are respectively 60mm, 10mm and 2mm is ground and polished, and then placed in the atmosphere control system 14, and the ground and polished steel material is kept in close contact with the flat electrode 12 by the clamping system 13, and then the After the atmosphere control system 14 is evacuated, the power supply 5 is turned on to perform pulse current treatment on the ground and polished integral steel material for 180ms. The pulse current treatment parameters are voltage 5V and current density 470MA / m 2 , the frequency is 50Hz, after the pulse current treatment, immediately open the cooling system 16 for water cooling treatment to obtain the steel material strengthened by the pulse current treatment.

[0042] The results show that the performance comparison of the steel material finally obtained in Example 1 and the steel material after traditional heat treatment is shown in Table 1. Compared with the traditio...

Embodiment 2

[0046] The TC4 titanium alloy material whose length, width and height are respectively 65mm, 12mm and 2.5mm is ground and polished and placed in the atmosphere control system 14, and then the grinding and polishing titanium alloy material is kept in close contact with the planar electrode 12 by the clamping system 13. , and then the atmosphere control system 14 is evacuated, and the power supply 5 is turned on to perform pulse current treatment on the polished titanium alloy material for 460ms. The pulse current treatment parameters are voltage 5V and current density 60MA / m 2 , frequency 50Hz, after the pulse current treatment, immediately open the cooling system 16 for water cooling treatment to obtain the titanium alloy material strengthened by pulse current treatment. Table 2 shows the performance changes of TC4 titanium alloy materials treated by different processes. Figure 5 Microstructures of TC4 alloys treated with different processes: Figure 5 5a is the TC4 titanium...

Embodiment 3

[0050] The 40Cr steel material with the length, width and height of 68mm, 15mm and 3mm is ground and polished, and then placed in the atmosphere control system 14, and then the grinding and polishing steel material is kept in close contact with the flat electrode 12 by the clamping system 13, and then the After the atmosphere control system 14 is evacuated, the power supply 5 is turned on to perform pulse current treatment for 480ms on the ground and polished integral steel material. The pulse current treatment parameters are voltage 5V and current density 300MA / m 2 , the frequency is 50Hz, after the pulse current treatment, immediately open the cooling system 16 for water cooling treatment to obtain the treated 40Cr steel material.

[0051] In the rapid cooling of the 40Cr steel material used in Example 3, due to the large temperature gradient, high residual stress will be generated, which will have more adverse effects on the material structure and performance; after the 40Cr...

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Abstract

The present invention provides a method and device for processing metal materials based on pulse current. The method includes steps such as traditional heat treatment, pulse current treatment, cooling process control, etc., to realize the structure control and toughening of metal materials. The processed metal materials have refined structure, solute distribution control, multi-scale / multi-phase mixing, and beneficial stress state. , defect and damage repair, surface strengthening, tissue layered distribution, large-scale multi-point strengthening and other structures; the device includes a host, tablet touch, computer control, power distribution system, power supply, base, and the host includes a pneumatic loading system, electrodes, Clamping system, atmosphere control system, workpiece walking system and cooling system, the device solves the problems of long time consumption, high energy consumption, and large difference between surface and core of traditional heat treatment, and can accurately control the influencing factors in the processing process. The device of the invention has systems such as external restraint, cooling, atmosphere control, precise positioning, etc., and can realize the processing of large-scale metal materials.

Description

technical field [0001] The invention relates to the technical field of metal material processing, in particular to a method and device for processing metal materials based on pulse current. Background technique [0002] Metal materials are an important foundation and symbol of social development and progress. With the rapid progress of human society, industrial development not only puts forward higher requirements for material properties, but also lightweight, energy saving, and environmental protection have gradually become one of the themes. In order to improve the performance of metal materials, rapid solidification (such as additive manufacturing), deformation, heat treatment, surface treatment and other technologies are the most commonly used and effective means in traditional methods, but limited by the characteristics of the method itself, it inevitably brings a series of issues. In addition, even if the mechanical properties of the material are good, on the one hand...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23H1/00B23H11/00
CPCB23H1/00B23H11/00Y02P10/25
Inventor 徐晓峰赵宇光马炳东吴超种雪颖
Owner JILIN UNIV
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