Device for preparing high-performance magnesium alloy through large plastic deformation and preparation method

A large plastic deformation, magnesium alloy technology, applied in forging/pressing/hammer devices, manufacturing tools, metal processing equipment, etc., can solve the problems of large free forging allowance, magnesium alloy folding, cracks, etc., to achieve less machining allowance , the tensile stress is small, the effect of eliminating internal defects

Active Publication Date: 2019-07-12
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the free forging allowance is large, and the upsetting deformation has a certain limit upsetting ratio. Attention should be paid to controlling the amount of reduction during each forging. The severe deformation is easy to cause defects such as folding and cracks in the magnesium alloy.

Method used

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  • Device for preparing high-performance magnesium alloy through large plastic deformation and preparation method
  • Device for preparing high-performance magnesium alloy through large plastic deformation and preparation method
  • Device for preparing high-performance magnesium alloy through large plastic deformation and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] A method for preparing a high-performance magnesium alloy with large plastic deformation, comprising the steps of:

[0054] Step 1. Select a die with a die-extrusion ratio of 2, select the corresponding magnesium alloy billet size according to the die size as 3mm*8.1mm*3mm, and the die-extrusion channel size as 3mm*8mm*3mm, place the magnesium alloy billet Put it into a muffle furnace with a temperature of 400°C for 18 hours, then take it out and put it in pure water to cool to room temperature;

[0055] Step 2. Position and assemble the mold-upper die 3 and the die-down die 4 of the mold one to form a mold-die, and heat the mold-die and mold-punch 1 in a muffle furnace at 400°C for 1.5 hours. And evenly smear lubricant (No. 74 cylinder oil and graphite with a particle size of 400 mesh) in the first cavity of the mold. The mold is fixed on the extruder table;

[0056] Step 3. Preheat the homogenized magnesium alloy billet, heat it in a muffle furnace at 450° C. for 30...

Embodiment 2

[0063] A method for preparing a high-performance magnesium alloy with large plastic deformation, comprising the steps of:

[0064] Step 1. Select a die with a die-extrusion ratio of 1, select the corresponding magnesium alloy billet size according to the die size as 6mm*6.1mm*6mm, and the die-extrusion channel size as 12mm*3mm*6mm, place the magnesium alloy billet Put it into a muffle furnace with a temperature of 450°C for 12 hours, then take it out and put it in pure water to cool to room temperature;

[0065] Step 2. Position and assemble the upper die 3 of die one and the lower die 4 of die one to form a die one die, heat the die one die and die one punch 1 to 320°C for 1 hour, and place them in the die one Apply lubricant evenly in the cavity of the concave mold (70% of No. 74 cylinder oil and 30% of molybdenum disulfide with a particle size of 400 mesh), and then fix the mold and the concave mold on the extruder workbench;

[0066] Step 3. Preheat the homogenized magnes...

Embodiment 3

[0073] A method for preparing a high-performance magnesium alloy with large plastic deformation, comprising the steps of:

[0074] Step 1. Select a die with a die-extrusion ratio of 1.4, select the corresponding magnesium alloy billet size 8mm*13.6mm*7.5mm according to the die size, and the die-extrusion channel size is 18mm*6mm*7.5mm, and the magnesium alloy billet Put it into a muffle furnace with a temperature of 350°C for 25 hours, then take it out and put it into pure water to cool to room temperature;

[0075] Step 2. Position and assemble the mold-upper die 3 and the die-down die 4 of mold one to form mold-die, preheat mold-die and mold-punch 1 in a muffle furnace at 370°C Insulate for 2 hours, and evenly apply lubricant (glass lubricant with a particle size of 109~190μm) in the first cavity of the mold, and then fix the first concave mold on the extruder workbench;

[0076] Step 3. Heating the homogenized magnesium alloy billet to 400° C. for 20 minutes, putting it in...

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Abstract

The invention discloses a device for preparing a high-performance magnesium alloy through large plastic deformation and a preparation method. The device comprises a die I and a die II which have the same structure; each die comprises a male die, an upper female die and a lower female die; a cuboid-shaped extrusion channel is horizontally formed between each upper female die and the corresponding lower female die; the upper female die is vertically penetrated to be provided with a male die channel; the male die channel communicates with the extrusion channel and is matched with the male die; the width of the male die channel of the die I is equal to the height of the extrusion channel of the die II, and the width of the male die channel of the die II is equal to the height of the extrusionchannel of the die I; and the thicknesses of the male die channels and the extrusion channels are equal. According to the device for preparing the high-performance magnesium alloy through the large plastic deformation and the preparation method, the magnesium alloy is repeatedly upset and extruded by replacing the dies to continuously accumulate strain, so that mass points of the magnesium alloy are expected to uniformly generate corner shearing, expansion and upsetting deformation, and finally a texture is weakened while forming a uniform fine crystal structure so as to prepare the high-performance magnesium alloy.

Description

technical field [0001] The invention belongs to the technical field of metal material processing equipment, and specifically relates to a device and a preparation method for preparing a high-performance magnesium alloy with large plastic deformation. Background technique [0002] The more prominent advantages of magnesium and magnesium alloys are high specific strength and specific stiffness, and they are currently the lightest metal structural materials, which have been widely used in various fields. However, magnesium and magnesium alloys have a close-packed hexagonal crystal structure, and their plastic workability in a cold state is poor. At present, magnesium alloy products are mainly castings, especially die castings. However, cast magnesium alloys have disadvantages such as uneven grains, coarse grains, poor mechanical properties, and prone to defects, which greatly limit the application range of magnesium alloys. [0003] Relevant studies have shown that: magnesium ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/00B21J5/02B21J13/02B21C23/00B21C25/02
CPCB21C23/002B21C25/02B21J5/002B21J5/02B21J13/02
Inventor 卢立伟项瑶刘剑波李宏贤蔡志华刘楚明刘龙飞
Owner HUNAN UNIV OF SCI & TECH
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