Large plastic shape and deformation blank-making method for eliminating anisotropy of magnesium alloy bar material with large height-diameter ratio
An anisotropic and plastic deformation technology, applied in the direction of manufacturing tools, metal processing equipment, metal extrusion dies, etc., can solve problems such as unevenness, difficulty in large deformation, overall performance of uneven components, etc., to achieve uniformity enhancement, Significant economic benefits and the effect of eliminating anisotropy
Inactive Publication Date: 2018-02-02
ZHONGBEI UNIV
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[0002] Magnesium alloys have few slip systems at room temperature, large deformation is difficult, and strong anisotropy will be formed after deformation, especially for large-scale component blanks, the uneven performance of the blank after deformation will cause uneven overall performance of the component
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[0019] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, and not to limit the present invention.
[0020] See figure 1 , Figure 4 , Upsetting die 1, mainly includes upsetting punch 11 and upsetting die 12, where the middle convex portion 112 of the bottom end 111 of the upsetting punch 11 is a parabola, and the equation is y=0.005x 2 , The two ends of side 113 are symmetrical involutes, the equation is x(t)=8*(cos(t)+t*sin(t)), y(t)=8*(sin(t)-t* cos(t)). At the beginning of upsetting, the middle convex portion 112 first contacts the middle of the blank to deform the blank in the center area of the end of the blank first. Compared with the traditional upsetting deformation, this area is changed to the non-...
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The invention discloses a large plastic shape and deformation blank-making method for eliminating anisotropy of a magnesium alloy bar material with the large height-diameter ratio. The large plastic shape and deformation method comprises the steps that (1) an upsetting die is used and is formed by combining space curve faces which combine the symmetrical parabolain in the middle portion of the bottom end of an upsetting male die and the involute at the edge portion, the magnesium alloy bar material is placed in the closed upsetting die for upsetting machining, upsetting deformation is conducted on the magnesium alloy bar material under action of stress, and the alloy bar material is lengthened in the radial direction and is shortened in the axial direction; (2) the blank material after upsetting is put into an extruding die for being extruded and deformed, the blank material is shortened in the radial direction and is lengthened in the axial direction, and a bar-shaped blank material is formed; (3) then after the blank material is extruded, defects at the tail part of the blank material are cut off, the blank material with the defects at the tail parts being cut is put into the upsetting die for upsetting deformation again, and one-time upsetting and extruding process is finished; and (4) the workpiece after upsetting deformation is subjected to upsetting and extruding again, and upsetting and extruding process is repeated by three times. According to the large plastic shape and deformation blank-making method for eliminating anisotropy of the magnesium alloy bar material with large height-diameter ratio, uniform upsetting and blank-making of the large height-diameter ratio bar material without anisotropy is achieved by means of upsetting and extruding repeated circulation large deformation.
Description
Technical field [0001] The invention relates to the technical field of plastic forming of metal materials, in particular to a method for making large-scale magnesium alloy bars without anisotropy and uniform deformation. Background technique [0002] Magnesium alloy has little sliding system at room temperature, large deformation is difficult, and strong anisotropy will be formed after deformation, especially for the billet of large components, the uneven performance of the billet after deformation will cause the overall performance of the component to be uneven . Upsetting is a commonly used forging forming method. During the upsetting, the flow direction of the material is perpendicular to the upsetting direction and flow in the radial direction. If repeated upsetting is performed, the anisotropy of the workpiece will be eliminated to the greatest extent. During extrusion deformation, since the metal is formed under three-directional compressive stress, for magnesium alloys wi...
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IPC IPC(8): B21J5/00B21J5/08B21J13/02B21C23/00B21C25/02
CPCB21J5/002B21C23/001B21C25/02B21J5/08B21J13/02
Inventor 张治民于建民王强崔婧钰郝红元程眉
Owner ZHONGBEI UNIV
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