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Equal channel forming die for thick-wall pipe and method of forming die for forming pipe

A technology of forming molds and equal channels, applied in metal extrusion molds and other directions, can solve the problems of complex production process and uneven deformation, and achieve good deformation effect, change shape and distribution, and improve stress and strain distribution and deformation texture. Effect

Inactive Publication Date: 2015-01-28
TAIYUAN UNIV OF TECH
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is: how to overcome the deficiencies of uneven deformation and complicated production process in the prior art, and provide a thick-walled (the ratio of pipe outer diameter to wall thickness is less than 20) pipe extrusion molding die and its forming pipe method

Method used

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  • Equal channel forming die for thick-wall pipe and method of forming die for forming pipe
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  • Equal channel forming die for thick-wall pipe and method of forming die for forming pipe

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Embodiment Construction

[0026] Such as Figure 1-Figure 8As shown, the present invention is mainly formed by fastening an outer mold and an inner mold, and the outer mold and the inner mold are combined to form an extrusion die cavity of a pipe, and the cross section of the extrusion die cavity smoothly transitions from a circular ring to a regular octagonal ring and then changes In a circular shape, the cross section of the regular octagonal ring is twisted at the center axis of the outer mold or the inner mold in the first and second angle torsion sections as the center axis of the torsion, and the value is 30°~90°, where α is the reference point angle, which is an arbitrary value; the clearance of the entire extrusion die cavity remains unchanged, which is equal to the wall thickness b of the preformed pipe.

[0027] The extrusion die includes a first male die, an outer die and an inner die.

[0028] The first punch is a pipe fitting, the left end of the first punch is connected to the clamping a...

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Abstract

The invention relates to the technical field of forming pipes with thick walls (a ratio of pipe diameter to wall thickness is less than 20) of such metals as aluminum, copper and steel and round cross sections, and in particular discloses an equal channel forming die for a thick-wall pipe and a method of the equal channel forming die for forming the pipe. An equal channel corner variable-cross section twist extrusion forming technical scheme adopted by the invention is similar to combination of twist shear deformation and upsetting and drawing extrusion-bulging deformation on a cross section, thus realizing combination of multiple deformation modes in an extrusion process. The equal channel forming die disclosed by the invention has the advantages of good deformation effect, quick speed and high efficiency; and the equal channel forming die can overcome a shortcoming of a current process which is uneven in deformation, greatly improve stress-strain distribution and a deformation texture in the material, and simultaneously improve material performance.

Description

technical field [0001] The invention relates to the technical field of forming round-section pipes with thick walls (the ratio of pipe outer diameter to wall thickness is less than 20) of metals such as aluminum, copper, and steel, in particular to an equal-channel forming die for thick-wall pipes and a method for forming pipes . Background technique [0002] Metal seamless pipe is the most widely used pipe at present. At present, its manufacturing method mostly adopts piercing and rolling. The inner and outer surfaces of the pipe produced by this traditional method will have some defects. Under such circumstances, major dangerous accidents such as rupture and deformation of the pipe section are prone to occur. Due to the wide use of pipe fittings and pipes in aerospace, construction engineering, mechanical equipment and other industrial fields, improving their comprehensive mechanical properties is of great significance for promoting the development of my country's nationa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C25/02B21C23/08
CPCB21C23/085B21C25/02
Inventor 汪程鹏薛凤梅林鹏杨琳池成忠曹晓卿林飞
Owner TAIYUAN UNIV OF TECH
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