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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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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 generated inside the billet in the cross-section of the existing extrusion forming method, which is easy to produce concentrated skin phenomenon, and then proposed a pulse current assisted extrusion forming device and extrusion forming method

Method used

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  • Pulse current assisted extrusion forming device and extrusion forming method

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specific Embodiment approach 1

[0020] Specific implementation mode one: combine figure 1 Illustrate present embodiment, the device of present embodiment comprises high-frequency pulse power supply 7, furnace body 9, vacuum system 10, pressurization device and mould; , a conductive punch 3 and a conductive die 4, the pressurizing device is composed of an upper pressure head 6 and a lower pressure head 8, the lower end of the upper pressure head 6 is set on the upper part of the furnace body 9, and the lower pressure head 8 is set on the furnace body 9, the lower end of the conductive die 4 is set on the upper end surface of the lower press head 8, the upper end of the conductive punch 3 is connected to the lower end face of the upper press head 6, and the conductive die 4 is placed in the cavity of the insulating outer film 2 Among them, the conductive convex mold 3 and the conductive concave mold 4 are connected to the high-frequency pulse power supply 7 as electrodes. The conductive punch 3 is the upper e...

specific Embodiment approach 2

[0021] Specific implementation mode two: combination figure 1 This embodiment is described. In this embodiment, the insulating outer film 2 is made of ceramic material, and the outer mold of the insulating ceramic material will not divert the current flowing through the blank to be formed, reducing energy loss. Other compositions and connection methods are the same as those in Embodiment 1.

specific Embodiment approach 3

[0022] Specific implementation mode three: combination figure 1 To illustrate this embodiment, the extrusion molding device described in 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 billet to be formed is measured in real time by a far-infrared thermometer. Other compositions and connection modes are the same as those in Embodiment 1 or 2.

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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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