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High formability forging method and device for magnesium alloy hub

A magnesium alloy and formability technology, applied in forging/pressing/hammer devices, wheels, manufacturing tools, etc., can solve the problems of low mechanical properties, lower yield, large extrusion force, etc., to achieve high material utilization, Improve product quality and high degree of automation

Active Publication Date: 2020-10-09
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can solve the existing problems such as complex manufacturing process and low mechanical properties of magnesium alloy wheels, this one-time forming method requires greater extrusion force, and the columnar crystal region at the edge of the ingot will directly Affect the forming of the rim, because the rim wall is thin and complex in shape, and the deformation is much larger than that of the spoke part, so the influence of columnar crystals on the edge of the ingot will be amplified during the forming process of the rim, causing cracks in the hub and reducing the quality of the finished product. Rate

Method used

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  • High formability forging method and device for magnesium alloy hub
  • High formability forging method and device for magnesium alloy hub
  • High formability forging method and device for magnesium alloy hub

Examples

Experimental program
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Effect test

specific Embodiment 1

[0068] Taking a magnesium alloy forging with high formability before shrinking extrusion and hub forging forming process as an example, adopt figure 1 The high formability forging device of the magnesium alloy wheel shown in the figure includes a guide column 1, an upper template 2, a pressing bar fixing plate 3, a bolt 4, a pressing bar 5, a fixing pin 6, a flat die 7, and a moving plate 8, Outer mold 9, tightening screw 10, inner mold 11, initial blank 12, mold sleeve 13, heating element 14, wheel hub forming cavity 15; outer mold hydraulic transmission device 16, lower template 17, ejector pin 18, wheel hub die 19 , Blank 20 after diameter reduction.

[0069] In the high formability forging device for magnesium alloy wheels, the pressing bar 5 and the upper die plate 2 are connected by the pressing bar fixing plate 3 with bolts 4, and the upper die plate 2 is controlled by the upper die plate hydraulic transmission device to move along the guide bar. Moving up and down, t...

specific Embodiment 2

[0087] Specific embodiment 2: the high formability forging device of the magnesium alloy wheel hub of this embodiment is the same as that of embodiment 1, the difference is that the way of fixing the mold is different. In this embodiment, the high formability forging device of the magnesium alloy hub used is shown in image 3 and Figure 4 , the fixing of the outer mold and the inner mold of the present embodiment is fixed through the disc spring device 23 and the mold sleeve 13 on the moving plate 8, specifically: the inner surface of the vertical section of the mold sleeve 13 is closely matched with the outer surface of the outer mold 9, When the die presses the blank in the central sizing belt of the inner mold 11 until it just touches the bottom surface of the outer mold, the disc spring in the disc spring device is also pressed to the upper surface of the horizontal section of the inner mold, and the pressing rod 5 moves downward, and the disc spring The greater the pres...

specific Embodiment 3

[0091] Specific embodiment 3: a high-formability forging device for a magnesium alloy wheel hub, same as embodiment 1.

[0092] A high-formability forging method for a magnesium alloy wheel hub, the same as in Example 1, except that the alloy composition of the blank is Mg-2Zn-0.4Mn-0.6La-0.3Ce, and the deformation process is: the homogenization system is 400°C×18h, the mold heating temperature is 350°C, the billet heating temperature is 350°C, the extrusion speed of the pressure rod 5 is 5mm / s when the diameter is pre-extruded, and the extrusion speed of the pressure rod 5 is 6mm when the hub is forged / s.

[0093] The different points of the hub structure are: θ=3°, R=15mm, h=48mm, r=6mm.

[0094] According to the mold structure and process conditions described in this embodiment, the finite element simulation is carried out to the hub forming process, and the results are as follows Figure 14 shown. It can also be seen that under the mold structure and hub forming proces...

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Abstract

The invention relates to a high formability forging method and device for a magnesium alloy hub, and belongs to the technical field of magnesium alloy manufacturing. The high formability forging method for the magnesium alloy hub comprises the following steps of performing homogenization treatment on a magnesium alloy blank, keeping the blank and a mold at 300 to 400 DEG C for 4 to 8 hours, performing reducing extrusion at 1 to 5 mm / s and the extrusion ratio of 1.0 to 1.2, and performing hub forging at 0.1 to 11 mm / s to obtain the magnesium alloy hub. According to the forging device, an extrusion reducing space is formed at the inner side of an inner mold through the flat mold matching of the inner mold and a compression mold, and an outer side structure of the inner mold, a bottom side structure of the compression mold of the hub and an inner side structure of an outer mold are matched to form a hub forming cavity. The device is simple in structure and easy to industrialize, the pre-deformation of the blank and the one-time forging forming of the hub can be realized by a set of molds, the continuous forming of pre-degeneration and forging processes of the method are achieved, thecolumnar crystal of the edge of the casting blank can be fully eliminated, and the formability and the yield of the hub forging are improved.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy manufacturing, and in particular relates to a high-formability forging method and device for a magnesium alloy wheel hub. Background technique [0002] As countries all over the world pay more and more attention to energy saving and emission reduction, automobile lightweight is gradually becoming an inevitable trend. Statistics show that every 100kg reduction in vehicle weight can reduce fuel consumption by 0.7L per 100 kilometers; every 10% reduction in vehicle weight can increase fuel efficiency by 6-10%; new energy electric vehicles can reduce weight by 100kg, and the cruising range of the vehicle can increase by 10-10% 15km. To realize the weight reduction of the whole vehicle, it is necessary to start with the weight reduction of components. Magnesium alloys have some excellent characteristics such as low density, high specific strength, and good shock absorption. Using magnesium al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21K1/40B21J13/02B21J13/03
CPCB21J13/02B21J13/03B21K1/40
Inventor 乐启炽廖启宇蒋燕超赵大志王彤宝磊
Owner NORTHEASTERN UNIV