Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com