Backward extrusion forming method of stepped hollow shaft part and die

A forming die and extrusion forming technology, applied in the field of warm extrusion, can solve the problems of inaccurate positioning, difficult forming of inner holes, and high scrap rate, and achieve the effects of high dimensional accuracy, complex forming and high material utilization.

Active Publication Date: 2016-09-07
HUOSHAN HUINENG AUTO PARTS MFG
View PDF4 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the inaccurate positioning of the product during forging, the scrap rate is high; the inner hole is not easy to form, or the forming is not in place, and the material utilization rate is not the best; the cost of the mold is expensive, the forging takes a long time in the mold, and the mold life is low

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
  • Backward extrusion forming method of stepped hollow shaft part and die
  • Backward extrusion forming method of stepped hollow shaft part and die
  • Backward extrusion forming method of stepped hollow shaft part and die

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways defined and covered by the claims.

[0028] The invention discloses a reverse extrusion forming method of a stepped hollow shaft, which comprises the following steps:

[0029] 1) Cutting by cylindrical bar sawing machine;

[0030] 2) Heat the material to 750°C through an intermediate frequency diathermy furnace, and then pre-extrude it, such as figure 2 shown;

[0031] 3) Put the pre-extruded forging quickly on the back-extrusion forming mold on one side, and perform closed back-extrusion forming, such as image 3 As shown; this step needs to grasp the speed beat, and minimize the influence of temperature drop on the process;

[0032] 4) Carry out rough turning on extruded parts to remove excess waste;

[0033] 5) Shot blasting is carried out on the forgings to obtain qualified fo...

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 backward extrusion forming method of a stepped hollow shaft part and a die. The backward extrusion forming method comprises the following steps: adopting a cylindrical bar material for blanking; heating to 750 DEG C through an intermediate-frequency diathermanous stove, and then forming a formed inner cavity through backward extrusion through an extrusion forming shape; carrying out little machining on an extrusion piece; then carrying out surface shot blasting treatment, thus obtaining a qualified forging piece. According to the backward extrusion forming method disclosed by the invention, a one-die two-process way is adopted by the die, so that the forming speed is quickened, an extrusion force of a punch is well shared, and meanwhile, the production rhythm is greatly increased; during a forming process of the two-process die, the in-die time of blank is reduced, the contact time of the die and the blank is reduced, and the service life of the die is greatly ensured; the problems of forming complexity, material waste, low efficiency and poor quality of the stepped hollow shaft part are solved.

Description

technical field [0001] The invention relates to the field of mechanical processing with less cutting allowance and metal warm extrusion, in particular to a reverse extrusion forming method and mold for stepped hollow shaft parts. Background technique [0002] There are two main types of forming methods for stepped hollow shafts: the first one is the traditional processing method. The bar is directly processed by mechanical cutting to obtain the product. This method has many processing steps, long processing time and high efficiency. If it is too low, it is not conducive to mass production; in the process of processing, a large amount of material will inevitably be wasted due to cutting, resulting in a sharp increase in material cost, which does not meet the requirements of energy-saving production. [0003] The second method is the more common step hollow shaft processing method, that is, it is directly formed by hot extrusion through a composite mold. The characteristic of...

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 Applications(China)
IPC IPC(8): B21K1/06B21J5/02B21J1/06B21J13/02
CPCB21J1/06B21J5/025B21J13/02B21K1/063
Inventor 汪长开薛克敏史家森谢瑞席文
Owner HUOSHAN HUINENG AUTO PARTS MFG
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap