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Magnesium alloy ultrasonic wave micro extrusion formed refined grain technology at normal temperature

A technology for refining grains and magnesium alloys, used in metal extrusion, metal extrusion dies, metal processing equipment, etc., can solve the problems of low surface quality of processed parts, difficult processing and welding performance, and uneven structure. Achieve the effect of reducing forming force, high production efficiency and good product surface quality

Active Publication Date: 2014-12-03
SHENZHEN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Existing methods for preparing ultra-fine-grained materials include equal-path angular extrusion (ECAP), high-pressure torsion (HPT) technology, and reciprocating extrusion (CEC) technology, etc., but the equal-path angular extrusion (ECAP) technology cannot process Materials with poor plasticity, low production efficiency and low surface quality of workpieces; the high-pressure torsion (HPT) technology can only process disc-shaped samples, and the materials prepared by high-pressure torsion have uneven structures from the center to the outside; The reciprocating extrusion (CEC) technology is difficult to process materials with poor weldability or poor plasticity at room temperature

Method used

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  • Magnesium alloy ultrasonic wave micro extrusion formed refined grain technology at normal temperature
  • Magnesium alloy ultrasonic wave micro extrusion formed refined grain technology at normal temperature
  • Magnesium alloy ultrasonic wave micro extrusion formed refined grain technology at normal temperature

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Effect test

Embodiment 1

[0045] The present invention provides a magnesium alloy ultrasonic micro-extrusion forming fine grain process at normal temperature, the steps are as follows:

[0046] Step 1: Make punch and die

[0047] Such as figure 2 As shown, the punch 3 adopts a stepped structure, the front end of the punch 3 forms an ultrasonic punch 31, and a transducer 1 and a horn 2 that can be touched by an ultrasonic generator are installed on the tail end of the punch 3. Specifically, the horn 2 is screwed to the punch 3 , and the transducer 1 is screwed to the horn 2 .

[0048] The die 4 is composed of a pressure plate 41 and a lower plate 42 which are screwed up and down sequentially. A lower plate fixing cavity 421 is provided in the middle of the lower plate 42, and the die is embedded in the lower plate fixing cavity 421 sequentially from bottom to top to work. The belt thin plate 423 and the die guide hole thin plate 422 form a die guide hole 424 in the middle of the die guide hole thin p...

Embodiment 2

[0062] This embodiment provides a magnesium alloy ultrasonic micro-extrusion forming grain refinement process at room temperature, the steps are basically the same as in embodiment 1, the difference is:

[0063] The operating parameters of the ultrasonic generator are: the amplitude is 24.04 μm, the ultrasonic action time is 2.0 s; the diameter of the working belt hole 425 of the die is φ0.5 mm.

[0064] Result detection:

[0065] The formed magnesium alloy part (height-diameter ratio is 1.76, diameter is φ0.5mm) is cut along the vertical extrusion direction, and after conventional inlaying, grinding and polishing, with corrosive agent (ingredients: picric acid 3g, alcohol 50ml, Acetic acid 20ml, water 20ml), corrode its surface, use research grade optical metallographic microscope DM1500 produced by Shenzhen Massive Optoelectronics Co., Ltd. to observe its metallographic structure. Test results such as Figure 4 As shown, compared with the original metallographic structure,...

Embodiment 3

[0068] This embodiment provides a magnesium alloy ultrasonic micro-extrusion forming grain refinement process at room temperature, the steps are basically the same as in embodiment 1, the difference is:

[0069] The operating parameters of the ultrasonic generator are: the amplitude is 24.04 μm, the ultrasonic action time is 1.75 s; the diameter of the working belt hole 425 of the die is φ0.3 mm.

[0070] Result detection:

[0071] The formed magnesium alloy parts (height-to-diameter ratio is 2.63, diameter is φ0.3mm) are cut along the vertical extrusion direction, and after conventional inlaying, grinding and polishing, corrosive agent (composition: picric acid 3g, alcohol 50ml, Acetic acid 20ml, water 20ml), corrode its surface, use research grade optical metallographic microscope DM1500 produced by Shenzhen Massive Optoelectronics Co., Ltd. to observe its metallographic structure. Test results such as Figure 5 As shown, compared with the original metallographic structure...

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Abstract

The invention provides a magnesium alloy ultrasonic wave micro extrusion formed refined grain technology at normal temperature. The technology comprises the following steps of manufacturing a male die and a female die, placing magnesium alloy parts into a cavity of the female die, performing die assembly extrusion on the magnesium alloy parts, performing separating die sinking, and taking out a formed part. According to the first step, an amplitude-change pole and an amplitude-change pole are sequentially connected to the tail end of the male die and can be touched by an ultrasonic generator. The magnesium alloy ultrasonic wave micro extrusion formed refined grain technology at the normal temperature can reduce forming force of metal, reduces friction between materials and the dies, expands the machining range of metal material plastic forming, and improves plastic forming capability of the metal materials, and the good product surface quality and the higher size precision can be further obtained.

Description

technical field [0001] The invention relates to the field of micro-processing of materials, in particular to a process for refining grains of magnesium alloys by ultrasonic micro-extrusion at normal temperature. Background technique [0002] With the rapid development of modern industry and aviation industry, the performance requirements of engineering materials are getting higher and higher, and new materials with high strength, high wear resistance and high corrosion resistance have become the research hotspots of material scientists; grain refinement It is one of the most effective means to improve the plastic properties and processing and forming properties of materials; ultra-fine-grained materials exhibit a series of special physical, chemical, mechanical and forming properties, and ultra-fine-grained materials have higher plasticity, Strength and wear resistance, so it has attracted much attention. [0003] Existing methods for preparing ultra-fine-grained materials ...

Claims

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Application Information

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IPC IPC(8): B21C23/02B21C23/21B21C26/00B21C25/02
Inventor 娄燕龙敏李落星陈恒
Owner SHENZHEN UNIV
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