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Two-step heat press-forging molding method of magnesium alloy thin-wall element and molding die

A technology for forming molds and magnesium alloys, which is applied in the manufacture of tools, metal processing equipment, forging/pressing/hammer devices, etc., can solve the problems of high surface quality, high pressure forging and good formability of magnesium alloy notebook casings, etc. Achieve high product surface quality, good fluidity, and reduce the effect of punching and forging forming pressure

Active Publication Date: 2014-03-26
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a two-step hot forging forming method for magnesium alloy thin-walled parts (such as notebook casings, etc.) The follow-up problems caused by pressure, and the two-step stamping forging method has good formability and high surface quality, which is the first of its kind for the marketization of magnesium alloy notebook stamping and forging.

Method used

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  • Two-step heat press-forging molding method of magnesium alloy thin-wall element and molding die
  • Two-step heat press-forging molding method of magnesium alloy thin-wall element and molding die
  • Two-step heat press-forging molding method of magnesium alloy thin-wall element and molding die

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Embodiment 1

[0053] Two-step stamping and forging is adopted, and the initial stamping and forging gathers materials for local complex structures to form a predetermined semi-finished notebook case, and finally forms the notebook case by stamping and forging. In this embodiment, the two-step hot stamping and forging forming method of magnesium alloy (AZ31) thin-walled parts includes the following steps:

[0054] A piece of 235mm×180mm magnesium alloy sheet is obtained by wire cutting, and its thickness is 2-3mm. The surface of the blank is polished with 1000# sandpaper to make the surface roughness Ra0.32 microns, and the surface is wiped off. Then put it into the box Heating to 380°C in a resistance furnace, holding time for 8 minutes, to avoid the growth of magnesium alloy grains, resulting in the decline of its punching and forging performance.

[0055] First use the preliminary forging die, heat the die to 320°C, at this time the convex and concave dies are in a closed state, when the ...

Embodiment 2

[0059] Two-step stamping and forging is adopted, and the initial stamping and forging gathers materials for local complex structures to form a predetermined semi-finished notebook case, and finally forms the notebook case by stamping and forging. In this embodiment, the two-step hot stamping and forging forming method of magnesium alloy (AZ31) thin-walled parts includes the following steps:

[0060] A piece of 235mm×180mm magnesium alloy sheet is obtained by wire cutting, and its thickness is 2-3mm. The surface of the blank is polished with 1000# sandpaper to make the surface roughness Ra0.32 microns, and the surface is wiped off. Then put it into the box Heating to 350°C in a resistance furnace, holding time for 10 minutes, to avoid the grain growth of the magnesium alloy, resulting in a decrease in its punching and forging performance.

[0061] First use the preliminary forging die and heat the die to 300°C. At this time, the convex and concave dies are in a closed state. Wh...

Embodiment 3

[0065] Two-step stamping and forging is adopted, and the initial stamping and forging gathers materials for local complex structures to form a predetermined semi-finished notebook case, and finally forms the notebook case by stamping and forging. In this embodiment, the two-step hot stamping and forging forming method of magnesium alloy (AZ31) thin-walled parts includes the following steps:

[0066] A piece of 235mm×180mm magnesium alloy sheet is obtained by wire cutting, and its thickness is 2-3mm. The surface of the blank is polished with 1000# sandpaper to make the surface roughness Ra0.32 microns, and the surface is wiped off. Then put it into the box Heating to 400°C in a resistance furnace, holding time for 5 minutes, to avoid the grain growth of the magnesium alloy, resulting in a decrease in its punching and forging performance.

[0067] First use the preliminary forging die, heat the die to 350°C, at this time the convex and concave dies are in a closed state, when th...

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Abstract

The invention relates to the forging processing technology of magnesium alloy, in particular to a two-step heat press-forging molding method of magnesium alloy thin-wall elements (such as notebook case) having complex profile structures (such as bolts, reinforcement ribs, buckles, hinge flanges and the like) and a special die for the method. The predetermined magnesium alloy thin-wall case semi-finished product is formed after being primarily forged into a locally complex structure focus material by the two-step heat press-forging, and finally the magnesium alloy thin-wall case is formed by forging. The two-step heat press-forging molding die of magnesium alloy thin-wall element comprises a primary forging die and a final forging die for the two-step heat press-forging. The method of the invention can be used to prepare magnesium alloy notebook case with complex structures such as bolts, reinforcement ribs, buckles and hinge flanges, wherein in comparison with the one-step direct press-forging process, the forging pressure is decreased, the tonnage demand of the apparatus is reduced, the service life of the die is prolonged, the problem of enormous pressure in forging molding of the magnesium alloy notebook case is solved, and the consequent problem caused by the enormous pressure is solved simultaneously.

Description

technical field [0001] The present invention relates to the forging processing technology of magnesium alloy, especially a kind of magnesium alloy thin-walled parts (such as: notebook case, etc.) Step hot stamping forming method and special mold thereof. Background technique [0002] With the continuous development of notebooks, notebook casing materials are also showing a more diversified trend. From the rough plastic casing at the beginning to the smooth metal casing now, the role of the notebook casing is mainly manifested in "protection, heat dissipation, and beauty. "These three aspects. Therefore, the notebook shell material requires high strength, heat resistance, electromagnetic shielding, dimensional stability and good appearance. The magnesium alloy casing has almost all the advantages above, and is the best optional material for the notebook casing. [0003] At present, the main methods for preparing magnesium alloy notebook casings are stamping welding forming...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21J5/02B21J1/06B21J3/00B21J13/02
Inventor 宋鸿武张士宏陈岩程明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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