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Nc incremental magnesium alloy sheet thermoforming method and heating mechanism thereof

A magnesium alloy plate and incremental forming technology, applied in metal processing equipment, forming tools, manufacturing tools, etc., can solve the problems of large deviation of starting temperature and ending temperature, affecting the application performance of formed parts, and coarse grain structure of the alloy. The effect of uniform temperature, simple structure and saving mold cost

Inactive Publication Date: 2011-06-01
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

We found that this heating system can solve the problem of uneven temperature of the sheet due to the use of resistance heating blank holders, and also solve the problem of large deviations in the forming start temperature and end temperature caused by heating the alloy sheet through heat radiation using an electric furnace Large, especially high temperature will lead to severe alloy grain structure, which will affect the application performance of formed parts

Method used

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  • Nc incremental magnesium alloy sheet thermoforming method and heating mechanism thereof
  • Nc incremental magnesium alloy sheet thermoforming method and heating mechanism thereof
  • Nc incremental magnesium alloy sheet thermoforming method and heating mechanism thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] In order to realize thermal numerical control incremental forming of magnesium alloy blanks, it is necessary to study the lubricant to evaluate the lubrication effect and the surface quality of the formed part to determine the lubricant. Table 1 is the experimental results of the lubricant composition at different temperatures, such as figure 1 The specific operation is as follows:

[0043] 1) Design of formed parts: Use CAD / CAM software to draw the processing trajectory of the square oblique truncated cone, and calculate the angle α between the forming surface of the sheet metal and the horizontal direction when the square oblique truncated cone is broken, which is called the forming limit angle. According to the value of the limit angle, it is possible to design and process any shape shell with a forming angle not greater than the forming limit angle.

[0044] 2) Take an alloy plate blank 7: the plate blank 7 is an AZ31 magnesium alloy thin plate, and its nominal comp...

Embodiment 2

[0048] Embodiment 2: The lubricant composition of this embodiment 2 is graphite powder 50% + BACC 50%, the forming temperature is 150°C±5°C, and the limit angle of one-time forming is 45°. Others are the same as in Example 1.

Embodiment 3

[0049] Embodiment 3: The lubricant composition of this embodiment 3 is graphite powder 50%+MoS 2 8%+BACC50%, the forming temperature is 250°C±5°C, and the limit angle of one-time forming is 60°. Others are the same as in Example 1.

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Abstract

The invention relates to an alloy plate numerical control (NC) gradual thermal-forming method and a heating device specially used by the method. The method of the invention comprises the steps as follows: heating plate blank, NC gradual forming, subsequent disposing, and brushing lubricant on the plate blank before heating; the temperature of an alloy plate is adjusted during the heating process by combining the resistance heating and heat radiation. The heating device consists of a heating flanging ring, a heating lower template, a heat insulation cushion plate, a thermocouple and an electric furnace; wherein, the electric furnace consists of a fireproof brick, fireproof mud and a resistance wire; the heat insulation cushion plate, the heating lower template and the heating flanging ringare sequentially arranged above the electric furnace; the electric furnace, the heating flanging ring and the heating lower template are provided with the thermocouple respectively. The heat radiation of the heating device reduces the temperature grads of a forming part during the forming process, improves the temperature distribution state of the forming part, leads the forming process to be carried out under the near equal-temperature condition, and ensures the forming part to have good tissue and performance indexes. The forming method has the obvious advantages of low production cost as well as simple process and device.

Description

technical field [0001] The invention relates to the field of plastic processing of metal materials, that is, it belongs to the thermoplastic forming of magnesium alloy shell-shaped parts. The process can be applied to the small batch production of various complex-shaped shell-shaped parts of difficult-to-process materials such as magnesium alloy and aluminum alloy. technical background [0002] Magnesium alloy has high specific strength, good rigidity and comprehensive mechanical properties, excellent shock resistance, impact resistance, good wear resistance, excellent thermal conductivity, non-magnetic metals have strong anti-electromagnetic wave interference ability, good electromagnetic shielding performance, and processing and forming performance Good, beautiful appearance, good texture, non-flammable, high recovery rate compared to plastic materials, in line with environmental protection laws, stable size, small shrinkage rate, and not easy to change due to ambient tempe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D37/10B21D37/16B21D22/00
Inventor 张青来肖富贵
Owner JIANGSU UNIV