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A method and device for improving the temperature uniformity of metal plate resistance heating by using gallium

A resistance heating, metal plate technology, applied in ohmic resistance heating parts, ohmic resistance electrodes, improving energy efficiency, etc., can solve the problems of uneven temperature distribution of steel plates, inconsistent deformation ability of steel plates, and different sizes, and achieve good results. Conductive performance, reduce the overall temperature difference, and ensure the effect of uniformity

Active Publication Date: 2022-05-17
安徽万宇机械设备科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, stamped and formed steel plates with irregular shapes are subjected to resistance heating. The cross-sectional size of the steel plate is different, and there are holes in the center of the steel plate. When heating, the skin effect of the current at the hole is more obvious, and the temperature distribution on the steel plate is extremely uneven. Even, the deformation ability of each part of the steel plate is inconsistent during stamping and forming, which may easily lead to defects in stamping and forming parts

Method used

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  • A method and device for improving the temperature uniformity of metal plate resistance heating by using gallium
  • A method and device for improving the temperature uniformity of metal plate resistance heating by using gallium
  • A method and device for improving the temperature uniformity of metal plate resistance heating by using gallium

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specific Embodiment approach 1

[0029] Combine below Figure 1-6 Describe this embodiment, a method of using gallium to improve the temperature uniformity of metal plate resistance heating, including a conductive metal plate 2, a mold 3, a pressure plate 4 and two electrodes 1, gaps and holes between the conductive metal plate 2 and the mold 3 Filled with liquid gallium, the pressure plate 4 is pressed on the conductive metal plate 2; it can be filled into the gaps and holes between the conductive metal plate 2 and the mold 3 through the liquid metal gallium, which ensures good electrical conductivity of the contact interface and reduces the The skin effect effectively compensates the area with a small cross-sectional area of ​​the irregular conductive metal plate 2, so that the cross-sectional area of ​​the conductive metal plate 2 in the direction of the current is almost the same, thus ensuring that the conductive metal plate 2 is heated at any time during the heating process. The current density of the c...

specific Embodiment approach 2

[0030] Combine below Figure 1-6 Describe this embodiment mode, this embodiment mode will further describe Embodiment 1, and described this method comprises the following steps:

[0031] Step 1: Add a sufficient amount of metal gallium into the mold 3, and heat the mold 3 so that the temperature of any part of the inner groove of the mold 3 exceeds 30°C. At this time, the metal gallium exists in liquid form; the melting point of gallium is 29.8°C The mold 3 can be heated with a heat gun, etc., to ensure that the temperature of the mold 3 is higher than the melting point of metal gallium, so that the metal gallium exists in a liquid state before the conductive metal plate 2 is placed into the groove of the mold 3;

[0032] Step 2: Put the conductive metal plate 2 into the groove of the mold 3, adjust the position of the conductive metal plate 2 so that the conductive metal plate is located in the center of the groove of the mold 3; check whether the liquid gallium completely fi...

specific Embodiment approach 3

[0036] Combine below Figure 1-6 Illustrate this embodiment, this embodiment will further illustrate Embodiment 2, the length, width and depth of the inner groove of the mold 3 are respectively greater than the length, width and height of the conductive metal plate 2; the length and width of the groove of the mold 3 Respectively greater than the length and width of the conductive metal plate 2, one is to ensure that the thermal expansion of the conductive metal plate 2 during the heating process will not affect the mold 3, so that the conductive metal plate 2 can be fully deformed; the other is to ensure that the liquid metal gallium can be The gap is completely filled; the depth of the groove of the mold 3 is greater than the thickness of the conductive metal plate 2, so that excess liquid metal gallium can be stored in the groove of the mold 3 without overflowing.

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Abstract

The invention relates to a metal plate resistance heating method, more specifically a method and device for improving the temperature uniformity of metal plate resistance heating by using gallium, including a conductive metal plate, a mold, a pressing plate and two electrodes, and a conductive metal plate and a mould. The gaps and holes between are filled with liquid gallium, and the pressure plate is pressed on the conductive metal plate, which can be filled into the gaps and holes between all the conductive metal plates and the mold through liquid metal gallium, which ensures good electrical conductivity of the contact interface and reduces The skin effect is eliminated, and the area with a small cross-sectional area of ​​the irregular conductive metal plate is effectively compensated, so that the cross-sectional area of ​​the conductive metal plate in the direction of the current is almost the same, thereby reducing the resistance heating of the irregular conductive metal plate. The overall temperature difference; a certain force is applied on the pressure plate to ensure that the metal plate does not undergo large warping deformation during the heating process.

Description

technical field [0001] The invention relates to a metal plate resistance heating method, more specifically a method and a device for improving the temperature uniformity of a metal plate resistance heating by using gallium. Background technique [0002] Steel is widely used in automobiles and other fields because of its excellent mechanical properties. In particular, high-strength steel has high strength, so it is widely used in the main structure and anti-collision structure of automobiles. The production part of these parts is formed by stamping, but the steel plate needs to be heated to 900°C before stamping and forming of high-strength steel. In foreign countries, infrared heating furnaces are mainly used to heat the steel plate. The steel plate is mainly heated by convection and radiation in the furnace. The thickness of the steel plate And the surface state has a great influence on the temperature rise of the steel plate. In China, high-strength steel plates are main...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B3/02H05B3/03
CPCH05B3/02H05B3/03Y02P10/25
Inventor 树西黄体方万龙刘鑫凌晨
Owner 安徽万宇机械设备科技有限公司
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