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Method for hydraulic forming of tee pipe using teflon film local lubrication

A polytetrafluoroethylene, local lubrication technology, applied in forming tools, metal processing equipment, manufacturing tools, etc., can solve the problems of long adjustment time, low efficiency, high difficulty, etc., and achieve low cleaning cost, fast operation and low cost. Effect

Active Publication Date: 2017-08-08
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the method to solve the two failure forms mainly relies on using different lubricants, adjusting the matching relationship between the feed speed at both ends of the tube blank and the increase in internal pressure to ensure that the formed parts are qualified, and the adjustment time is long, difficult and inefficient.

Method used

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  • Method for hydraulic forming of tee pipe using teflon film local lubrication
  • Method for hydraulic forming of tee pipe using teflon film local lubrication
  • Method for hydraulic forming of tee pipe using teflon film local lubrication

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Embodiment

[0036] Such as Figure 1-3 As shown, this embodiment describes in detail the working principle and process of a method for locally lubricating a hydroforming tee pipe using a polytetrafluoroethylene film according to the present invention.

[0037] This embodiment provides a method for partially lubricating a hydroforming tee with a polytetrafluoroethylene film, comprising the following steps:

[0038] (1) if figure 1 Shown, design the specification of polytetrafluoroethylene film 7;

[0039] Design polytetrafluoroethylene film 7 is rectangular, and the thickness t of described polytetrafluoroethylene film 7 is 0.02mm, and width B is D1+(10~15) mm, and wherein, D1 is the tee branch pipe diameter; Length L is 1 / 2πD, wherein, D is the diameter of the straight pipe of the tee pipe, and the specific size of the polytetrafluoroethylene film 7 is determined according to the diameters of the branch pipes and straight pipes of the tee pipe to be formed.

[0040] (2) if figure 2 A...

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Abstract

The invention discloses a method for hydraulic forming of a tee pipe using teflon film local lubrication. A rectangular teflon film is designed according to the diameter of a pipe billet and the diameter of a tee pipe branch pipe, the center portion, where the tee pipe branch pipe is to be formed, of the pipe billet is symmetrically wrapped with the teflon film to replace the mode that the outside of the entire pipe is coated with oily lubricant or completely wrapped with lubricating fluid in the prior art, and thus operation is made more convenient. Moreover, in the forming process, the branch pipe position can be better lubricated, materials can flow into a branch pipe mold cavity quickly, and fracturing caused by insufficient supplementing of the branch pipe forming materials is avoided. Meanwhile, due to the fact that the back portion of the branch pipe is not wrapped with a thin film, friction is large, the material flowing speed is low, and wrinkling cannot happen easily.

Description

technical field [0001] The invention relates to the technical field of tee pipe forming, in particular to a method for locally lubricating and hydroforming a tee pipe by using a polytetrafluoroethylene film. Background technique [0002] Tee pipes include T-shaped tee pipes, Y-shaped tee pipes, etc., which are integrally formed by hydraulic bulging, that is, a straight pipe billet is placed in the cavity of the tee pipe mold, and the two ends of the pipe billet are sealed with pushers , the two pushers feed to the middle of the mold at the same time, and the liquid is injected into the closed tube blank to pressurize. Under the matching relationship between the pressurization and the feeding at both ends of the tube blank, the tube blank gradually expands to form a three-way pipe. [0003] In the prior art, before the tube blank is put into the mold cavity, the outer surface of the tube blank is sprayed with an oily lubricant or wrapped with a film. This lubrication method ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D26/037B21D37/18
CPCB21D26/037B21D37/18
Inventor 徐雪峰孙前江董洪波付春林朱永国
Owner NANCHANG HANGKONG UNIVERSITY
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