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Extrusion device and method for producing variable-section seamless pipe

A technology of extrusion device and extrusion method, which is applied in the field of metal extrusion, can solve the problems of large extrusion force, poor stability and uniformity, etc.

Active Publication Date: 2019-09-13
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The object of the present invention is to provide an extrusion device and method for producing seamless pipes with variable cross-sections, so as to solve the problem of excessive extrusion force and extrusion forming in the extrusion process of the traditional variable-section seamless pipe moving needle extrusion method. The quality and performance of variable-section seamless pipes are poor in stability and uniformity. Constant extrusion ratio, labor-saving, and low energy consumption produce variable-section seamless pipes with good structure, performance and quality consistency, stability and uniformity. seam tube

Method used

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  • Extrusion device and method for producing variable-section seamless pipe
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  • Extrusion device and method for producing variable-section seamless pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Extrusion forming of 7075 aluminum alloy variable section seamless pipe thickened inside the end.

[0069] In conjunction with accompanying drawing 2, the extrusion method of the 7075 aluminum alloy variable cross-section seamless pipe thickened in the end is specifically described as follows:

[0070] Preheat the extrusion needle 1, extrusion die 2, extrusion outer cylinder 3 and auxiliary cylinder 6 to 430°C. Use 65% of No. 52 cylinder oil, 25% of rAK-1 accumulator graphite powder and 10% tin oil ester salt to be made into lubricant to extrude pin 1, extrude outer cylinder 3 inwall, extrude die 2 inwall and The inner wall of the auxiliary cylinder 6 is fully lubricated.

[0071] The 7075 aluminum alloy billet 9 with the outer step is perforated in advance by machining, preheated to 450°C, and loaded into the extrusion outer cylinder 3, and the extrusion needle 1 is passed through the pre-processed inner hole of the 7075 aluminum alloy billet 9, so that The extrusion...

Embodiment 2

[0078] Extrusion forming of AZ91 magnesium alloy variable cross-section seamless pipe with external thickening at the end.

[0079] In conjunction with accompanying drawing 3, the extruding method of the AZ91 magnesium alloy variable cross-section seamless pipe with external thickening at the end is specifically described as follows:

[0080] Preheat the extrusion needle 1, extrusion die 2, extrusion outer cylinder 3 and auxiliary cylinder 6 to 250°C. Use the lubricant made of 50% No. 52 cylinder oil and 50% rAK-1 battery graphite powder to fully lubricate the extrusion needle 1, the inner wall of the extruded outer cylinder 3, the inner wall of the extrusion die 2 and the inner wall of the auxiliary cylinder 6.

[0081] The AZ91 magnesium alloy billet 9 with external steps is perforated in advance by machining, preheated to 380°C, and then loaded into the extrusion outer cylinder 3, and the extrusion needle 1 is passed through the pre-processed inner hole of the AZ91 magnesiu...

Embodiment 3

[0088] Extrusion forming of 2A12 aluminum alloy variable cross-section seamless pipe with thickened inside end and thickened middle.

[0089] In conjunction with accompanying drawing 4, the extrusion method of the 2A12 aluminum alloy variable cross-section seamless pipe that is thickened in the end and thickened in the middle is specifically described as follows:

[0090] Preheat the extrusion needle 1, extrusion die 2, extrusion outer cylinder 3 and auxiliary cylinder 6 to 380°C. Use 65% of No. 52 cylinder oil, 25% of rAK-1 accumulator graphite powder and 10% tin oil ester salt to be made into lubricant to extrude pin 1, extrude outer cylinder 3 inwall, extrude die 2 inwall and The inner wall of the auxiliary cylinder 6 is fully lubricated.

[0091] Pre-punching the 2A12 aluminum alloy billet 9 with a stepped exterior is machined, preheated to 400°C and then loaded into the extrusion outer cylinder 3, and the extrusion needle 1 is passed through the pre-processed inner hole ...

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Abstract

The invention discloses an extrusion device and method for producing a variable-section seamless pipe, and belongs to the technical field of metal extrusion. The extrusion device is composed of an extrusion needle, an extrusion mold, an extrusion outer barrel, an auxiliary barrel, a first extrusion pad, a second extrusion pad, a first extrusion shaft and a second extrusion shaft. According to theextrusion device and method for producing the variable-section seamless pipe, the problems that extrusion force needed by a traditional variable-section seamless pipe moving needle extrusion method inthe extrusion process is too large, and stability and uniformity of quality and performance of an extruded and formed variable-section seamless pipe are poor are solved; and the variable-section seamless pipe good in structure, performance and quality consistency, stability and uniformity is produced with the constant extrusion ratio, labor saving and low energy consumption.

Description

technical field [0001] The invention belongs to the technical field of metal extrusion, and in particular relates to an extrusion device and method for producing variable-section seamless pipes. Background technique [0002] Variable cross-section seamless pipe is a special-shaped seamless pipe whose cross-sectional shape changes in stages along the axial direction. There are four typical types of thickening at the end and thickening in the middle. Variable cross-section seamless pipes are widely used in aerospace, transportation, machinery manufacturing, oil exploration, energy extraction and deep-sea drilling and other fields. [0003] Variable cross-section seamless pipes are generally formed by the traditional moving needle extrusion method. Its forming process is: put the metal billet that has been pre-pierced and homogenized annealed into the extrusion cylinder, and then pass the extrusion needle whose cross-sectional shape changes along the axial direction through t...

Claims

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Application Information

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IPC IPC(8): B21C23/08
CPCB21C23/085
Inventor 刘雪峰潘跃
Owner UNIV OF SCI & TECH BEIJING
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