Technology for preparing small-bore and thick-wall metal tubes by rotary swaging technique

A small diameter, metal tube technology, applied in the field of metal pressure processing, to achieve the effect of simple and easy process, high dimensional accuracy, and avoidance of inner wall cracks

Active Publication Date: 2015-04-01
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The patent application number ZL201310030114.6 discloses a method for manufacturing microporous copper tubes with high conductivity and high hardness. The manufacturing process also uses swaging technology to form thick-walled tubes, but the difference from the present invention is that the mandrel is a long steel wire. , and its products are limited to copper tubes with a hole diameter of 3mm or less

Method used

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  • Technology for preparing small-bore and thick-wall metal tubes by rotary swaging technique
  • Technology for preparing small-bore and thick-wall metal tubes by rotary swaging technique

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Choose a copper tube with a size of Φ8×1.5mm as the tube blank, and after pickling, the cut-to-length length is 6m.

[0026] (2) Install the tube blank on the feeding mechanism to ensure that the core mold device passes through the inner hole of the tube blank;

[0027] (3) Feed the core mold device to a fixed position so that the core head part is located in the sizing area of ​​the mold;

[0028] (4) The feeding mechanism sends the tube blank to the rotary forging box for rotary forging;

[0029] The product specification after one pass swaging is Φ5×2mm. Mold cone half angle α=10°, core mold transition cone angle β=8°, core head diameter 1mm, length 20mm, reduction rate of about 37.5%, tube blank feeding speed 0.5m / min, final product dimensional accuracy ±0.02mm ~±0.05mm, the edge of the inner hole is neat and there is no microcrack.

Embodiment 2

[0031] (1) Choose a 304 seamless steel pipe with a size of Φ18×5.5mm as the tube blank, and after pickling, the cut-to-length length is 1m.

[0032] (2) Install the tube blank on the feeding mechanism to ensure that the core mold device passes through the inner hole of the tube blank;

[0033] (3) Feed the core mold device to a fixed position so that the core head part is located in the sizing area of ​​the mold;

[0034] (4) The feeding mechanism sends the tube blank to the rotary forging box for rotary forging;

[0035] The product specification after the first pass of swaging is Φ16×6mm. Mold cone half angle α=8°, core mold transition cone angle β=6°, core head diameter 4mm, length 40mm, diameter reduction rate 11%, tube blank feeding speed 1.5m / min.

[0036] The product specification after the second pass swaging is Φ14×6mm. Mold cone half angle α=8°, core mold transition cone angle β=6°, core head diameter 2mm, length 50mm, diameter reduction rate 12.5%, tube blank feeding speed ...

Embodiment 3

[0038] (1) Choose 20# seamless steel pipe with a size of Φ34×9mm as the tube blank, and after pickling, the cut-to-length length is 0.5m.

[0039] (2) Install the tube blank on the feeding mechanism to ensure that the core mold device passes through the inner hole of the tube blank;

[0040] (3) Feed the core mold device to a fixed position so that the core head part is located in the sizing area of ​​the mold;

[0041] (4) The feeding mechanism sends the tube blank to the rotary forging box for rotary forging;

[0042] The product specification after one rotation forging is Φ30×10mm. Mold cone half angle α=7°, core mold transition cone angle β=5°, core head diameter 10mm, length 60mm, diameter reduction rate about 12%, tube blank feeding speed 0.8m / min, final product dimensional accuracy ±0.05mm ~±0.08mm, the edge of the inner hole is neat and there is no microcrack.

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Abstract

The invention provides a technology for preparing small-bore and thick-wall metal tubes by a rotary swaging technique and belongs to the technical field of metal working. The technology comprises the following processes: (1) an appropriate tube blank is selected, the tube blank undergoes descaling, and cut-to-length is carried out; (2) the tube blank is installed onto a feeding mechanism, and it is ensured that a mandrel unit passes through an inner bore of the tube blank; (3) the mandrel unit is fed to a fixed position, and a mandrel head part is positioned inside a die sizing area; (4) the feeding mechanism sends the tube blank into a rotary swaging case for rotary swaging; and (5) the processes from (2) to (4) are repeated, and the forming process is finished after 1-3 passes. The technology is simple and easy to do. Size precision of the product is high (+/-0.02 to +/-0.08mm). Defects such as inner-wall crack, pit, folding and the like which are easy to happen to small-bore and thick-wall metal tubes prepared by the present drawing technology are avoided. The technology provided by the invention can be used for molding of various small-bore and thick-wall metal tubes.

Description

Technical field [0001] The invention relates to the technical field of metal pressure processing, in particular to a process for preparing small-diameter thick-walled metal pipes by using rotary forging technology. Background technique [0002] In industry, steel pipes with a ratio of outer diameter to wall thickness (D / S) less than 20 are often called thick-walled pipes. Thick-walled pipes are mainly used for petroleum geological drilling pipes, diesel high-pressure oil pipes, liquid conveying pipes, boiler pipes, etc. [0003] Hot-rolled small-diameter thick-walled metal pipes are likely to cause the inner hole of the tube blank to be hexagonal or triangular. Therefore, the current manufacturing of small-diameter thick-walled metal pipes mainly adopts multi-pass cold drawing or cold drawing (rolling). The process is usually first The fixed mandrel is cold drawn or rolled, and finally there is no mandrel drawn (air drawn) to form. The specific pass is determined by the process. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/06B21J5/06
CPCB21C37/06B21J5/06
Inventor 韩静涛张明忠郝庆乐李奎陆钢刘亚东
Owner UNIV OF SCI & TECH BEIJING
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