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Cold forming method for bimetallic T-shaped three-way pipe

A technology of three-way pipe fittings and bimetallic composite pipes, which is applied in the field of metal pipe fittings processing, can solve the problems of radial deformation, small branch pipe height, serious accumulation, etc., and achieve the effect of improving utilization rate and high production efficiency

Inactive Publication Date: 2010-12-29
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of cracking and delamination at the end of the main pipe, serious radial deformation, local serious accumulation and small branch pipe height in the process of internal high pressure forming, the present invention develops a cold forming method for double-layer metal T-shaped tee pipe fittings

Method used

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  • Cold forming method for bimetallic T-shaped three-way pipe
  • Cold forming method for bimetallic T-shaped three-way pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The bimetallic composite pipe is blanked, the cladding of the bimetallic composite pipe is cleaned, and the attachments on the inner surface are removed. Then the bimetal composite pipe is placed in the lower die of the forming die 2 and positioned;

[0020] Insert the thin ends of the two stepped shaft punches 1 into the two ends of the bimetallic composite pipe respectively; after the upper die and the lower die are closed, inject 30MPa hydraulic oil from the hole on the stepped shaft punch 1, and the bimetallic composite pipe The branch pipe is formed under the action of the expansion force of the hydraulic oil. In order to supplement the material to the branch pipe, the stepped shaft punch 1 squeezes the two ends of the bimetallic composite pipe, and the bimetallic composite pipe is formed under the action of the stepped shaft punch 1 and the forming die 2. The composite pipe is formed into a semi-finished bimetallic T-shaped tee fitting at one time 3;

[0021] The...

Embodiment 2

[0025] The bimetallic composite pipe is blanked, the cladding of the bimetallic composite pipe is cleaned, and the attachments on the inner surface are removed. Then the bimetal composite pipe is placed in the lower die of the forming die 2 and positioned;

[0026] Respectively extend the thin ends of the two stepped shaft punches 1 into the two ends of the bimetal composite tube; set the loading path of the internal pressure and the feed displacement of the punches, and set the feed displacement of the stepped punch 1 as One-half of the total feed displacement. After the mold is closed, 115MPa hydraulic oil is passed through the hole in the center of the stepped punch 1, and the bimetallic composite pipe forms a branch pipe under the action of the expansion force of the hydraulic oil. At both ends, under the combined action of the stepped shaft punch 1 and the forming die 2, the bimetallic composite pipe undergoes plastic deformation along the forming die with planar charact...

Embodiment 3

[0032] The bimetallic composite pipe is blanked, the cladding of the bimetallic composite pipe is cleaned, and the attachments on the inner surface are removed. Then the bimetal composite pipe is placed in the lower die of the forming die 2 and positioned;

[0033] Respectively extend the thin ends of the two stepped shaft punches 1 into the two ends of the bimetal composite tube; set the loading path of the internal pressure and the feed displacement of the punches, and set the feed displacement of the stepped punch 1 as One-third of the total feed displacement. After the mold is closed, the high-pressure liquid is passed through the hole in the center of the stepped punch 1, and the bimetallic composite pipe forms a branch pipe under the action of the bulging force of the high-pressure liquid. Under the combined action of the stepped shaft punch 1 and the forming die 2, the bimetallic composite pipe undergoes plastic deformation along the forming die with planar features un...

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Abstract

The invention provides a cold forming method for a bimetallic T-shaped three-way pipe, which prepares a composite three-way pipe by a composite pipe by directly adopting an integral forming process, and adopts a stepped plunger chip and a die surface with planes at two sides in a forming process, so that the method can improve the forming performance of the bimetallic composite pipe, and can solve the problems of cracking and delamination of the main pipe end part, serious radial deformation, serious local accumulation and small branch height of the metal composite pipes prepared by various processes in an internal high-pressure forming process. The method has the characteristics of high production efficiency, low cost, complete removal of end part cracking of the composite pipe and local material radial accumulation, uniform wall thickness distribution and no surface scratching.

Description

technical field [0001] The invention belongs to the technical field of metal pipe fitting processing, and mainly relates to a cold forming method of a double-layer metal T-shaped tee pipe fitting. Background technique [0002] Pipeline transportation is a reliable, economical, convenient and non-polluting method, which is widely used in energy transmission. Conventional pipelines are mostly single-layer pipes, and there are common leakage problems caused by poor hardness, wear resistance and corrosion resistance. Although some pipelines adopt the method of internally coating corrosion-resistant and wear-resistant coatings, the bonding strength between the coating and the substrate single-layer pipe is not high, and the coating process is complicated and the cost is high. The bimetallic composite pipe is made of special performance material as the lining and composited with ordinary metal structural materials according to the requirements of use. For the requirements of wea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/29B21D26/02
Inventor 陶杰郭训忠
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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