A method of cold extrusion wave shaping for curved parts

A technology of cold extrusion and arc-shaped parts, which is applied in the direction of metal extrusion dies, etc., can solve the problems of high shape and position accuracy, large internal stress of arc-shaped parts, and large springback, so as to improve forming accuracy and reduce springback deformation effect

Active Publication Date: 2019-07-09
NO 59 RES INST OF CHINA ORDNANCE IND
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Problems solved by technology

Especially for arc-shaped parts, the geometric structure of the product has many transitional arcs, and the shape and position accuracy is high. It is formed by traditional cold extrusion method. The internal stress of the arc-shaped parts is large, the rebound is large, and the size jump of each part cannot be controlled. , resulting in the need for subsequent finishing or grinding, affecting the quality and efficiency of product manufacturing

Method used

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  • A method of cold extrusion wave shaping for curved parts
  • A method of cold extrusion wave shaping for curved parts
  • A method of cold extrusion wave shaping for curved parts

Examples

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Embodiment 1

[0021] Taking the pure copper arc-shaped piece as the implementation object, the main body thickness of the blank is 4mm, and the cold extrusion shaping die is as follows: figure 1 As shown, the loading on the upper die of cold extrusion includes 10 periodic composite velocities, in which the amplitude of the fluctuating velocity in the adjacent effective plastic deformation cycle decreases from 0.2mm to 0.02mm in turn, and the fluctuating velocity frequency is 1.6 Hz, the number of discrete points is 100, and the loaded compound speed and trajectory are as follows figure 2 As shown in the figure, the upper mold sequentially performs multiple cycle forming on the billet downwards, such as accelerating loading, decelerating loading, and holding pressure. Using the same method, set the wave recombination speed in the finite element (FEM) simulation software, and import the pure copper material model to simulate and analyze the wave shaping process of cold extrusion of arc parts...

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Abstract

The invention discloses a cold extruding fluctuation shaping method for an arc-shaped piece. A recombination speed is loaded to an upper cold extruding die, the instantaneous true strain of the recombination speed in each period is controlled, and therefore the speed track path of the recombination speed in each period and shaping amount corresponding to the speed track paths are optimally designed, the upper die is promoted to carry out cold extruding shaping on a blank, and the forming precision of the arc-shaped piece is improved. The recombination speed includes a plurality of periodic recombination speeds, and each periodic recombination speed is formed by adding a fixed speed and a fluctuation speed. The vector direction of the recombination speed is downward along the extruding axisall the time. The amplitudes of the adjacent fluctuation speeds with amplitudes larger than 0 are gradually reduced. By means of the cold extruding fluctuation shaping method for the arc-shaped piece, the rebound deformation of the cold extruding piece during finishing can be effectively reduced, and the cold extruding fluctuation shaping method can be widely applied to products of copper, tantalum, tungsten and other alloys.

Description

technical field [0001] The invention relates to a cold extrusion wave shaping method for arc parts. Background technique [0002] Materials such as pure copper and tantalum-tungsten alloy have good cold forming properties and are widely used in high-precision parts. Especially for arc-shaped parts, the geometric structure of the product has many transitional arcs, and the shape and position accuracy is high. It is formed by traditional cold extrusion method. The internal stress of the arc-shaped parts is large, the rebound is large, and the size jump of each part cannot be controlled. , resulting in the need for subsequent finishing or grinding, affecting the quality and efficiency of product manufacturing. Contents of the invention [0003] The object of the present invention is to provide a method for cold extrusion wave shaping of arc-shaped parts. By decomposing the total deformation amount into several forming cycles with small deformation amounts, and adopting the m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C25/02B21C23/14
CPCB21C23/14B21C25/02
Inventor 黄树海赵祖德韩虞梅夏祥生刘艳红陈强黄志伟舒大禹
Owner NO 59 RES INST OF CHINA ORDNANCE IND
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