Design method of large-diameter thick-walled tube casting and extrusion compound forming mold cavity

A composite forming and design method technology, applied in the direction of metal extrusion die, metal extrusion mandrel, etc., can solve the problem of uneven microstructure of formed parts, and achieve uniform and compact internal structure, good plasticity and toughness, and excellent overall performance Effect

Inactive Publication Date: 2018-12-28
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art, to provide a method for designing the mold cavity of large-diameter thick-walled pipe casting and extrusion composite forming, and to solve the microstructure of the formed part existing in the process of casting-extrusion composite forming large-diameter thick-walled pipe. Average technical issues

Method used

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  • Design method of large-diameter thick-walled tube casting and extrusion compound forming mold cavity
  • Design method of large-diameter thick-walled tube casting and extrusion compound forming mold cavity

Examples

Experimental program
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Effect test

Embodiment 1

[0017] Such as figure 1 and figure 2 As shown, the figure includes extrusion die 1, billet 2, mandrel 3, extrusion cylinder 4 and punch 5. Taking the formed pipe fitting size φ720mm×100mm (wall thickness) as an example, a large-diameter thick-walled pipe casting The design method of the mold cavity of extrusion composite molding comprises the following steps:

[0018] 1) Determine the parameters of the extrusion model cavity, including: the half-angle angle α of the extrusion die cone surface is 54°, the length h of the sizing belt is 85mm, and the transition fillet radius R1 between the extrusion die cone surface and the sizing belt is 150mm , The radius R2 of the transition fillet between the extrusion die cone surface and the extrusion barrel wall is 160mm;

[0019] 2) Determine the transition position of the mandrel section to ensure that the inner and outer walls of the pipe end the plastic deformation at the same time;

[0020] 3) Determine the dimensional parameters...

Embodiment 2

[0022] Such as figure 1 and figure 2 As shown, the figure includes extrusion die 1, billet 2, mandrel 3, extrusion cylinder 4 and punch 5. Taking the formed pipe fitting size φ1067mm×52mm (wall thickness) as an example, a large-diameter thick-walled pipe casting The design method of the mold cavity of extrusion composite molding comprises the following steps:

[0023] 1) Determine the parameters of the extrusion model cavity, including: the half-angle angle α of the extrusion die cone surface is 53°, the length h of the sizing belt is 128mm, and the transition fillet radius R1 between the extrusion die cone surface and the sizing belt is 160mm , The radius R2 of the transition fillet between the extrusion die cone surface and the extrusion barrel wall is 160mm;

[0024] 2) Determine the transition position of the mandrel section to ensure that the inner and outer walls of the pipe end the plastic deformation at the same time;

[0025] 3) Determine the dimensional parameter...

Embodiment 3

[0027] Such as figure 1 and figure 2 As shown, the figure includes extrusion die 1, billet 2, mandrel 3, extrusion cylinder 4 and punch 5. Taking the formed pipe fitting size φ1300mm×85mm (wall thickness) as an example, a large-diameter thick-walled pipe casting The design method of the mold cavity of extrusion composite molding comprises the following steps:

[0028] 1) Determine the parameters of the extrusion model cavity, including: the half-angle angle α of the extrusion die cone surface is 55°, the length h of the sizing belt is 140mm, and the transition fillet radius R1 between the extrusion die cone surface and the sizing belt is 170mm , The radius R2 of the transition fillet between the extrusion die cone surface and the extrusion barrel wall is 160mm;

[0029] 2) Determine the transition position of the mandrel section to ensure that the inner and outer walls of the pipe end the plastic deformation at the same time;

[0030] 3) Determine the dimensional parameter...

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Abstract

The invention relates to a design method of a large-diameter thick-walled tube casting and extrusion compound forming mold cavity, and belongs to the technical field of large-diameter thick-walled tube casting and extrusion compound forming. The design method solves the technical problem that a microstructure of a formed part exists in the process of casting and extrusion compound forming of a large-diameter thick-walled tube is not uniform. According to the technical scheme, the design method for the large-diameter thick-walled tube casting and extrusion compound forming mold cavity comprisesthe following steps that (1) the parameters of an extrusion model cavity are determined; (2) the transition position of a core rod section is determined to ensure that the inner and outer walls of apipe fitting finish plastic deformation at the same time; and (3) the size parameter of the transition part of a core rod is determined. The design method has the advantages of low cost, high strength, good plastic toughness, high production efficiency and excellent inner wall of the pipe fitting and overall performance.

Description

technical field [0001] The invention belongs to the technical field of large-diameter thick-walled pipe casting-extrusion composite forming, and in particular relates to a design method for a mold cavity of large-diameter thick-walled pipe casting-extrusion composite forming. Background technique [0002] Large-diameter thick-walled seamless pipe is an important large-scale component in thermal power, nuclear power, national defense and shipbuilding industries. With the rapid development of my country's large-scale supercritical thermal power units, nuclear power units, petrochemical, aerospace, shipbuilding, high-speed rail and military industries, the demand for large-diameter thick-walled pipes is increasing. [0003] When using traditional hot extrusion dies to produce large-diameter thick-walled pipes in combination with casting and extrusion, due to the small amount of deformation of the pipe wall, especially the inner wall, during the forming process, and the large di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C25/02B21C25/04
CPCB21C25/02B21C25/04
Inventor 王瑞麒李永堂雷步芳齐会萍
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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