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Variable-channel extrusion die and forming method

A technology of extrusion die and variable channel, applied in the direction of metal extrusion die, metal extrusion mandrel, etc., can solve the problems of cracks, uniform control, unsatisfactory stress state of deformed billets, etc.

Inactive Publication Date: 2011-11-16
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the problems existing in the prior art or that cracks often appear in the material during the molding process, or the required equipment has a high tonnage, the mold load is complex, or in the equal channel angular extrusion, the stress state of the deformed blank is not ideal, and the strain of the section The distribution is also difficult to control the lack of uniformity, the present invention proposes a variable channel extrusion die and molding method

Method used

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  • Variable-channel extrusion die and forming method

Examples

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Effect test

Embodiment 1

[0026] In this embodiment, a variable-channel extrusion die is used to extrude a prefabricated workpiece of Aermet100 high-nickel-cobalt secondary-hardening ultra-high-strength steel. The specification of the blank 2 for forming the prefabricated workpiece is 100mm×400mm, the prepared specifications are 80mm×625mm prefabricated workpiece. The extrusion process parameters are extrusion speed of 10mm / s, deformation temperature of 900-1000°C, and coefficient of friction between the billet 2 and the die 3 of 0.2-0.4.

[0027] The variable-channel extrusion die used in this embodiment mainly includes a punch 1 and a die 3 . Both punch 1 and die 3 are made of 5CrNiMo steel. The punch 1 is cylindrical, one end is the clamping and fixed end of the extrusion equipment, and the other end is the extrusion working end; the external dimensions of the working part of the punch 1 are the same as those of the billet 2.

[0028] Such as figure 2 As shown, the die 3 is a hollow square c...

Embodiment 2

[0037] In this embodiment, a variable-channel extrusion die is used to extrude a prefabricated workpiece of Aermet100 high-nickel-cobalt secondary-hardening ultra-high-strength steel. The specification of the blank 2 for forming the prefabricated workpiece is 120mm×450mm, the prepared specifications are 100mm×648mm prefabricated workpiece. The extrusion process parameters are extrusion speed of 1mm / s, deformation temperature of 900-1000°C, and coefficient of friction between the billet 2 and the die 3 of 0.2-0.4.

[0038] The variable-channel extrusion die used in this embodiment mainly includes a punch 1 and a die 3, both of which are made of 5CrMnMo steel. The punch 1 is cylindrical, one end is the clamping and fixed end of the extrusion equipment, and the other end is the extrusion working end; the external dimensions of the working part of the punch 1 are the same as those of the billet 2.

[0039] The die 3 is hollow cylindrical, and its external dimensions must meet...

Embodiment 3

[0048] In this embodiment, a prefabricated workpiece of Ti-6Al-4V titanium alloy is extruded by a variable-channel extrusion die. The specification of the blank 2 for forming the prefabricated workpiece is 110mm×400mm, the prepared specifications are 85mm×670mm prefabricated workpiece. The extrusion process parameters are extrusion speed of 5mm / s, deformation temperature of 850-950°C, and coefficient of friction between the billet 2 and the die 3 of 0.2-0.4.

[0049] The variable-channel extrusion die used in this embodiment mainly includes a punch 1 and a die 3, both of which are made of 5CrNiMo steel. The punch 1 is cylindrical, one end is the clamping and fixed end of the extrusion equipment, and the other end is the extrusion working end; the external dimensions of the working part of the punch 1 are the same as those of the billet 2.

[0050] The die 3 is hollow cylindrical, and its external dimensions must meet the strength requirements of extrusion. The hollow par...

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Abstract

The invention relates to a variable-channel extrusion die and a forming method. The variable-channel extrusion die comprises a male die (1) and a female die (3), a die cavity of the female die sequentially comprises a feeding section (4), a front forming section (5), a middle forming section (6), a rear forming section (7) and a discharging section (8) from an inlet of a blank (2) to an outlet ofthe blank (2), wherein the feeding section (4) is a circular equant channel, the front forming section (5) is a circular-elliptical transition channel, the middle forming section (6) is a prismatic elliptical channel, the rear forming section (7) is an elliptical-circular transition channel, and the discharging section (8) is a prismatic circular channel; and the blank (2) enters from an inlet ofthe female die (3) and is limited by the die cavity of the female die (3) to change a circular cross-section into an elliptical cross-section and change the elliptical cross-section into the circularcross-section in order to form a performed workpiece. The variable-channel extrusion die has simple structure, low load, low cost and high efficiency and can be widely applied to producing rods and wires of steel and nonferrous metal and forging and blanking difficultly deformed materials of large-scale shaft parts, high-speed steel, powder metallurgy, and the like.

Description

1. Technical field [0001] The invention relates to the field of thermal processing of metal materials, in particular to a variable channel extrusion die and a forming method. 2. Background technology [0002] With the advancement of modern science and technology, major equipment is developing in the direction of large-scale, heavy-duty, high-power, and high-reliability. As the main load-bearing component for major equipment, forging technology plays an irreplaceable role in aviation, aerospace, atomic energy, automobile, machinery and other industrial sectors. The forging process can not only obtain the required shape and size, but also significantly improve the mechanical properties of the material such as strength, plasticity and toughness. [0003] In major mechanical equipment, such as train spindles, automobile crankshafts, aero-engine turbine disks, turbine blades and other parts, fracture accidents have a great relationship with the quality of forgings. Fracture of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C25/08
Inventor 李付国冀国良
Owner NORTHWESTERN POLYTECHNICAL UNIV
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