Unlock instant, AI-driven research and patent intelligence for your innovation.

Method and device for solving diameter shrinkage stress of pipe blank in pushing-pressing-drawing composite diameter shrinkage process

A diameter reduction process and tube blank technology, which is applied in the field of solving the shrinkage stress of the tube blank in the push-pull composite diameter reduction process, can solve the problems of time-consuming and labor-intensive, unable to formulate process parameters in time

Active Publication Date: 2021-01-29
QINHUANGDAO TONGQIAO TECH CO LTD
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method of using finite element simulation to determine the shrinkage stress of the tube billet has the problem of time-consuming and labor-intensive problems, and it cannot formulate reasonable process parameters in time, and the initial process parameters need to rely on the experience of engineers

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
  • Method and device for solving diameter shrinkage stress of pipe blank in pushing-pressing-drawing composite diameter shrinkage process
  • Method and device for solving diameter shrinkage stress of pipe blank in pushing-pressing-drawing composite diameter shrinkage process
  • Method and device for solving diameter shrinkage stress of pipe blank in pushing-pressing-drawing composite diameter shrinkage process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0054] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in combination with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are exemplary only, and are not intended to limit the scope of the present invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concept of the present invention.

[0055] The push-pull compound diameter reduction adopts the "reverse pull" type mandrel, and the driving device pulls the mandrel to reversely pull out at a speed greater than the elongation of the tube blank while the diameter reduction die is working. The principle of push-pull composite shrinkage deformation is introduced as follows. Push-pull compound diameter reduction: push the mandrel into the inside of the tube b...

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 relates to a method and a device for solving diameter shrinkage stress of a pipe blank in a pushing and drawing composite diameter shrinkage process, comprising the following steps of: substituting initial parameters into an expression of metal warp stress in a sizing area and wall thickness of the pipe blank after diameter reduction to obtain the metal warp stress in the sizing areaand the wall thickness of the pipe blank after diameter reduction; and a four-order Runge-Kutta method is used for solving a balance differential equation of a wall thickness thinning area so as to obtain an expression of the warp stress of the reduced pipe blank. The process parameters are substituted into the expression, whether the pipe blank has the possibility of yield instability or not canbe quickly pre-judged, meanwhile, the influence rule of the process parameters on the hole shrinkage stress can also be obtained, and an efficient method is provided for quick formulation of the process.

Description

technical field [0001] The invention relates to the technical field of pipe fitting processing, in particular to a method and a device for solving the shrinkage stress of a pipe blank in a push-pull composite diameter reduction process. Background technique [0002] Diameter reduction is an important forming method in pipe fittings processing. It has high production efficiency and low manufacturing cost. It is widely used in the manufacture of pipe parts in aircraft, automobiles and construction machinery. At present, there are mainly two methods for reducing the diameter of the pipe fittings: free pushing and reducing the diameter and mandrel pushing the reducing diameter. For large-deformed pipe fittings, the diameter is freely pushed, the mold structure is simple, and the production efficiency is high, but the forming quality is not high, and the end of the tube blank may be axially cracked; the mandrel is used to push the compressed diameter, although the forming quality...

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): G06F30/17G06F17/13G06F113/14G06F119/14
CPCG06F30/17G06F17/13G06F2113/14G06F2119/14
Inventor 吴娜刘超
Owner QINHUANGDAO TONGQIAO TECH CO LTD