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

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...

Examples

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...

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...

Examples

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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