Pulse current assisted extrusion forming device and extrusion forming method

A technology of extrusion forming and pulse current, applied in metal extrusion, metal extrusion die, metal extrusion control equipment, etc., can solve the problems of uneven distribution of current density in cross-section, complex process flow, low work efficiency, etc. , to achieve the effect of automatic heating, simple process flow and high production efficiency

Inactive Publication Date: 2010-03-17
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The present invention aims to solve the problems of large heat loss and long heating time in the existing extrusion forming device, complex technological process, low working efficiency and uneven distribution of the current density g

Method used

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  • Pulse current assisted extrusion forming device and extrusion forming method

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Example Embodiment

[0020] Specific embodiment one: combination figure 1 To illustrate this embodiment, the device of this embodiment includes a high-frequency pulse power supply 7, a furnace body 9, a vacuum system 10, a pressurizing device, and a mold; the vacuum system 10 is connected to the inner cavity of the furnace body 9, and the mold is made of an insulating outer film 2. , The conductive convex mold 3 and the conductive concave mold 4, the pressure device is composed of an upper indenter 6 and a lower indenter 8, the lower end of the upper indenter 6 is set in the upper part of the furnace body 9, and the lower indenter 8 is set in the furnace body In the lower part of 9, the lower end of the conductive concave mold 4 is set on the upper end surface of the lower indenter 8, the upper end of the conductive convex mold 3 is connected with the lower end surface of the upper indenter 6, and the conductive concave mold 4 is placed in the cavity of the insulating outer film 2. Among them, the ...

Example Embodiment

[0021] Specific implementation manner two: combination figure 1 To explain this embodiment, the insulating outer film 2 of this embodiment is made of ceramic material, and the outer mold of the insulating ceramic material does not shunt the current flowing through the blank to be formed, thereby reducing energy loss. Other components and connection modes are the same as the first embodiment.

Example Embodiment

[0022] Specific implementation mode three: combination figure 1 To explain this embodiment, the extrusion molding device of this embodiment further includes a far-infrared thermometer 1, the infrared thermometer 1 is provided with a probe 1-1, and the probe 1-1 is arranged in the furnace body 9. The temperature of the blank to be formed is measured in real time by a far infrared thermometer. Other components and connection modes are the same as those in the first or second embodiment.

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Abstract

A pulse current assisted extrusion forming device and an extrusion forming method relate to an extrusion forming device and a method thereof. The invention solves the problems that the existing extrusion forming device is great in heat loss, and long in heating time, and the existing extrusion forming method is complicated in technical process flow, low in work efficiency and non-homogenous in distribution of density of the current produced inside the blank on the cross-section and easy to cause skin effect. A current-conducting female mold of the device is arranged in a mold cavity of an insulating outer film; a current-conducting male mold and the current-conducting female mold are used as electrodes and connected on a high frequency pulse power source; the pressure within the range of 5-200MPa is applied to the current-conducting male mold by an upper pressure head according to a yield strength value at the temperature selected by the blank to be formed so that the blank is extrudedto be a required shape by the mold after plastic extrusion deformation; the device has high heating speed and improves the work efficiency; and the method uses the heat effect of pulse current and the electro-plastic effect, thereby obviously improving the forming efficiency of the blank, increasing the material plasticity and saving the energy resource.

Description

technical field [0001] The invention relates to an extrusion forming device and an extrusion forming method using the device. Background technique [0002] Extrusion forming is to apply external force to the metal billet that will be placed in the mold cavity or extrusion cylinder, forcing the metal to extrude from the die hole to obtain the shape and size of the required cross-section, and extrusion products with certain mechanical properties. Plastic processing method. Extrusion can be divided into cold extrusion, warm extrusion and hot extrusion according to the temperature classification of the extrusion billet. Existing warm extrusion or hot extrusion (extrusion deformation performed in the temperature range below the recrystallization temperature of the metal, above the recovery temperature or above the recrystallization temperature) involves a relatively complicated heating process. Usually in engineering, the methods of heating the billet before extrusion are: [...

Claims

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Application Information

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IPC IPC(8): B21C23/21B21C29/00B21C25/02B21C31/00B21C23/02
Inventor 张凯锋张春萍王国峰
Owner HARBIN INST OF TECH
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