Extrusion integrated forming die for magnesium alloy

Abstract

This invention discloses an integrated extrusion forming die for magnesium alloys, comprising a pair of forming dies. Each of the two forming dies has two pairs of die fastening bolt holes, and the two forming dies are fixedly connected by the two pairs of die fastening bolt holes. A forming channel is provided in both forming dies, and the forming channel includes, from top to bottom, a feed inlet, a spherical expansion deformation zone, a diameter reduction thread torsion deformation zone, a discharge outlet, and a discharge channel. A pressure head is provided at the top of the feed inlet, and the outer edge of the pressure head is in contact with the inner wall of the feed inlet. The spherical expansion deformation zone in this invention can perform spherical upsetting on the billet, promote dynamic recrystallization, accelerate the rearrangement of dislocations, and improve material strength while improving processing efficiency. At the same time, the diameter reduction thread torsion deformation zone adopts traditional diameter reduction extrusion and rotary extrusion deformation, which increases material strength by intensifying the internal deformation of the material.

Description

Technical Field

[0001] This invention relates to the field of magnesium alloy processing technology, and more specifically, to an integrated extrusion forming die for magnesium alloys. Background Technology

[0002] Magnesium alloys are currently the lightest metal composite materials used in industrial applications. They have advantages such as high specific strength, high specific modulus, high damping, excellent electromagnetic shielding and machinability, easy recycling and abundant resources. Large plastic extrusion deformation technology is currently the process with the most significant optimization effect in processing magnesium alloys. The most advanced technologies include: rectangular vortex extrusion, alternating extrusion, asymmetric extrusion cavity cyclic expansion extrusion, hydrostatic tube cyclic expansion extrusion, and machined bearing extrusion.

[0003] However, existing processing and forming dies generally have the disadvantage of requiring repeated extrusions, resulting in low processing efficiency, long processing time, and high processing costs. Developing a new type of large plastic extrusion deformation technology that is simple, efficient, and low-cost is the key to breaking through the current bottleneck in the manufacturing of high-performance magnesium alloys. Summary of the Invention

[0004] This invention provides an integrated extrusion forming die for magnesium alloys, which solves the problem that existing forming dies generally require repeated extrusions, resulting in low processing efficiency and high processing costs.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] An integrated extrusion forming die for magnesium alloys includes a pair of forming dies. Each of the two forming dies has two pairs of die fastening bolt holes, and the two forming dies are fixedly connected by the two pairs of die fastening bolt holes. A forming channel is provided in both forming dies. The forming channel includes, from top to bottom, a feed port, a spherical expansion deformation zone, a diameter reduction thread torsion deformation zone, a discharge port, and a discharge channel. A pressure head is provided at the top of the feed port, and the outer edge of the pressure head is in contact with the inner wall of the feed port.

[0007] Preferably, the top and bottom diameters of the spherical expansion deformation zone are both D1, the longitudinal span of the spherical expansion deformation zone is L1, the maximum lateral span of the spherical expansion deformation zone is D2, the spherical expansion deformation zone is symmetrical about the plane of the maximum lateral span, the curvature of the sidewall of the spherical expansion deformation zone ranges from 0.002 to 0.02, the value of D1 ranges from 20 to 40 mm, and the value of L1 ranges from 15 to 20 mm.

[0008] Preferably, the top diameter of the reduced diameter thread torsional deformation zone is D1, the longitudinal span of the reduced diameter thread torsional deformation zone is L4, the angle between the two sides of the reduced diameter thread torsional deformation zone and the vertical plane is R1, the value of L4 is in the range of 8-13mm, and the value of R1 is in the range of 120°-150°.

[0009] Preferably, the inner diameters of the discharge port and the discharge channel are D3 and D4, respectively, the ratio of D3 to D4 is 8:10, and the longitudinal span of the discharge port is 3-7mm.

[0010] Preferably, five threaded grooves are evenly provided on the side wall of the reduced diameter thread torsional deformation zone, and the cross-sectional shape of each threaded groove is a tangential circle.

[0011] Preferably, the curvature of the tangential circle of the threaded groove section is R2, the height of the tangential circle is L2, the bottom span of the tangential circle is L3, the value of R2 is in the range of 1.5mm-2mm, the value of L2 is in the range of 0.8-1.2mm, and the value of L3 is in the range of 2.5mm-3.5mm.

[0012] The principle and beneficial effects of this technical solution:

[0013] (1) The integrated forming mold in this invention can achieve expansion extrusion deformation, diameter reduction extrusion deformation and rotation extrusion deformation of the material to be processed in a single pass, which greatly reduces the number of processing steps, thereby improving processing efficiency and reducing processing costs.

[0014] (2) The spherical expansion deformation zone set in this invention can perform spherical upsetting on the billet. When the material to be processed passes through the spherical expansion extrusion zone, it can effectively induce the magnesium alloy grains to undergo dynamic recrystallization, promote the occurrence of dynamic recrystallization, accelerate the rearrangement of dislocations, and ultimately improve the performance of the material.

[0015] (3) The diameter reduction thread torsion deformation zone set in this invention adopts traditional diameter reduction extrusion deformation, which reduces the grain size of the processed material through the shearing area and enhances the material strength. At the same time, the multiple thread grooves uniformly set therein can make the material rotate and deform in the mold during the extrusion process, thereby increasing the material strength by aggravating the internal deformation of the material. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of any molding die in this invention;

[0017] Figure 2 This is a schematic diagram showing the dimension calibration of the processing channel portion in this invention;

[0018] Figure 3 This is a schematic diagram showing the dimension calibration of the threaded groove cross-section in this invention;

[0019] The reference numerals in the accompanying drawings include: 1. Mold fastening bolt hole; 2. Forming mold; 3. Discharge port; 4. Feed port; 5. Spherical expansion deformation zone; 6. Reducing thread torsional deformation zone; 7. Discharge channel. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments:

[0021] Example:

[0022] like Figures 1 to 3 As shown, the present invention provides an integrated extrusion forming die for magnesium alloys, including a pair of forming dies 2. Each of the two forming dies 2 has two pairs of die fastening bolt holes 1. The two forming dies are fixedly connected by the two pairs of die fastening bolt holes 1. A forming channel is provided in both forming dies 2. The forming channel includes, from top to bottom, a feed port 4, a spherical expansion deformation zone 5, a diameter reduction thread torsion deformation zone 6, a discharge port 3, and a discharge channel 7. A pressure head is provided at the top of the feed port 4, and the outer edge of the pressure head is in contact with the inner wall of the feed port 5.

[0023] like Figure 1 and Figure 2 As shown, the top and bottom diameters of the spherical expansion deformation zone 5 are both D1, the longitudinal span of the spherical expansion deformation zone 5 is L1, the maximum lateral span of the spherical expansion deformation zone 5 is D2, the spherical expansion deformation zone 5 is symmetrical about the plane of the maximum lateral span, the curvature of the sidewall of the spherical expansion deformation zone 5 ranges from 0.002 to 0.02, the value of D1 ranges from 20 to 40 mm, and the value of L1 ranges from 15 to 20 mm.

[0024] like Figure 1 and Figure 2 As shown, the top diameter of the reduced diameter thread torsional deformation zone 6 is D1, the longitudinal span of the reduced diameter thread torsional deformation zone 6 is L4, the angle between the two sides of the reduced diameter thread torsional deformation zone 6 and the vertical plane is R1, the value of L4 is 8-13mm, and the value of R1 is 120°-150°.

[0025] During the material compression process, spherical coupling expansion first occurs in spherical expansion deformation zone 5, and then the material is filled in zone 1 after extrusion expansion. After the expansion is completed, the material continues to be extruded downwards, and then enters the shearing thread extrusion zone in zone 2. Through expansion and shearing extrusion, the relative extrusion ratio is increased, making the material deformation more intense. The threaded groove guides the material to twist, and torsional deformation occurs inside the mold, which concentrates the stress in the core area, increases the grain refinement effect, better induces dynamic recrystallization, and ultimately improves the performance of magnesium alloy.

[0026] like Figure 1 and Figure 2 As shown, the inner diameters of the discharge port 3 and the discharge channel 7 are D3 and D4, respectively, with the ratio of D3 to D4 being 8:10. The longitudinal span of the discharge port 3 is 3-7mm.

[0027] like Figure 1 and Figure 3 As shown, five threaded grooves are evenly distributed on the side wall of the reducing thread torsional deformation zone 6, and the cross-sectional shape of each threaded groove is a tangent circle.

[0028] like Figure 1 and Figure 3 As shown, the curvature of the tangential circle of the threaded groove section is R2, the height of the tangential circle is L2, the bottom span of the tangential circle is L3, the value of R2 is 1.5mm-2mm, the value of L2 is 0.8-1.2mm, and the value of L3 is 2.5mm-3.5mm.

[0029] The specific usage and function of this embodiment are as follows:

[0030] Assemble the two forming molds 2 by fastening the bolts 1 on the mold, and place the raw material to be extruded into the feed port 4. Predict the length and volume of the processed output bar, select a pressure head of appropriate length, and adjust the pressure head to be directly above the feed port 4. Then, move the pressure head vertically downward to squeeze the raw material to be extruded. Under the influence of the press, the pressure head pushes the material downward. The entire extrusion process must maintain a uniform extrusion speed. When the bottom of the pressure head is 2-4mm away from the top plane of the spherical expansion deformation zone 5, the top of the mold contacts the pressure head limiting structure, ending the extrusion process. After the extruded raw material is completely discharged from the discharge channel 7 at the bottom of the discharge port 3, disassemble the two forming molds 2 and reset the pressure head to complete one magnesium alloy processing.

[0031] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. An integrated extrusion forming die for magnesium alloys, characterized in that: It includes a pair of forming molds (2), each of the two forming molds (2) is provided with two pairs of mold fastening bolt holes (1), the two forming molds are fixedly connected by the two pairs of mold fastening bolt holes (1), the two forming molds (2) are provided with a forming channel, the forming channel includes, from top to bottom, a feed port (4), a spherical expansion deformation zone (5), a diameter reduction thread torsion deformation zone (6), a discharge port (3) and a discharge channel (7), the top of the feed port (4) is provided with a pressure head, the outer edge of the pressure head is in contact with the inner wall of the feed port (4); The top and bottom diameters of the spherical expansion deformation zone (5) are both D1, the longitudinal span of the spherical expansion deformation zone (5) is L1, the maximum lateral span of the spherical expansion deformation zone (5) is D2, and the spherical expansion deformation zone (5) is symmetrical about the plane of the maximum lateral span. The top diameter of the reduced diameter thread torsion deformation zone (6) is D1, and multiple threaded grooves are uniformly provided on the side wall of the reduced diameter thread torsion deformation zone (6).

2. The integrated extrusion forming die for magnesium alloys according to claim 1, characterized in that: The curvature of the sidewall of the spherical expansion deformation zone (5) ranges from 0.002 to 0.02, the value of D1 ranges from 20 to 40 mm, and the value of L1 ranges from 15 to 20 mm.

3. The integrated extrusion forming die for magnesium alloys according to claim 2, characterized in that: The longitudinal span of the reduced diameter thread torsional deformation zone (6) is L4, and the angle between the two sides of the reduced diameter thread torsional deformation zone (6) and the vertical plane is R1. The value of L4 is 8-13mm, and the value of R1 is 120°-150°.

4. The integrated extrusion forming die for magnesium alloys according to claim 3, characterized in that: The inner diameters of the discharge port (3) and the discharge channel (7) are D3 and D4, respectively, and the ratio of D3 to D4 is 8:

10. The longitudinal span of the discharge port (3) is 3-7mm.

5. The integrated extrusion forming die for magnesium alloys according to claim 4, characterized in that: Each of the aforementioned threaded grooves has a tangentially circular cross-sectional shape.

6. The integrated extrusion forming die for magnesium alloys according to claim 5, characterized in that: The curvature of the tangential circle of the threaded groove section is R2, the height of the tangential circle is L2, the bottom span of the tangential circle is L3, the value of R2 is in the range of 1.5mm-2mm, the value of L2 is in the range of 0.8-1.2mm, and the value of L3 is in the range of 2.5mm-3.5mm.

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