A method for hydroforming a three-way pipe using a polytetrafluoroethylene film for local lubrication
A polytetrafluoroethylene, local lubrication technology, applied in the direction of 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: 2018-08-07
NANCHANG HANGKONG UNIVERSITY
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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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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 locally lubricating and hydraulically forming a tee pipe by using a polytetrafluoroethylene film. According to the diameter of the tube blank and the diameter of the branch pipe of the tee pipe, a rectangular polytetrafluoroethylene film is designed, and the tee pipe is formed on the tube blank. The central part of the branch pipe is symmetrically wrapped with polytetrafluoroethylene film, which replaces the oil-based lubricant sprayed on the outside of the entire pipe or fully wrapped and lubricated in the prior art. The mold cavity of the branch pipe avoids the rupture due to insufficient replenishment of the forming material of the branch pipe; at the same time, the back of the branch pipe has high friction, slow material flow and is not easy to wrinkle because it is not covered with a film.
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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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