Extrusion integrated forming die for magnesium alloy

Abstract

The extrusion integrated forming die for the magnesium alloy comprises a pair of forming dies, two pairs of die fastening bolt openings are formed in each of the two forming dies, the two forming dies are fixedly connected through the two pairs of die fastening bolt openings, a forming channel is jointly formed in the two forming dies, and the die fastening bolt openings are formed in the forming channels. The forming channel sequentially comprises a feeding port, a spherical expansion deformation area, a reducing thread torsion deformation area, a discharging port and a discharging channel from top to bottom, a pressing head is arranged at the top end of the feeding port, and the outer edge of the pressing head is attached to the inner wall of the feeding port; the spherical expansion deformation area can conduct spherical upsetting on the blank, dynamic recrystallization is promoted, dislocation rearrangement is accelerated, the material strength is improved, meanwhile, the machining efficiency is improved, meanwhile, traditional reducing extrusion and rotary extrusion deformation are adopted in the reducing thread torsion deformation area, and the machining efficiency is improved. The material strength is improved by intensifying the internal deformation of the material.

Description

Technical Field

[0001] The present invention relates to the technical field of magnesium alloy processing, and more specifically, to an extrusion integrated forming die for magnesium alloy. Background Art

[0002] Magnesium alloy is the lightest metal composite material currently used in industry. It has the advantages of high specific strength, high specific modulus, high damping, excellent electromagnetic shielding and cutting performance, easy recycling and abundant resources. Large plastic extrusion deformation technology is the most significant process for optimizing the processing of magnesium alloys. The most advanced technologies include: rectangular vortex extrusion, alternating extrusion, asymmetric extrusion chamber cyclic expansion extrusion, static pressure tube cyclic expansion extrusion, turning bearing extrusion, etc.

[0003] However, existing processing and forming dies generally have the disadvantage of requiring repeated multi-pass extrusion, which results in low processing efficiency, time-consuming processing, and high processing costs. Developing a new large plastic extrusion deformation technology with simple process, high efficiency and low cost is the key to breaking through the existing bottleneck of high-performance magnesium alloy manufacturing. Summary of the invention

[0004] The present invention provides an extrusion integrated forming die for magnesium alloy, so as to solve the problem that the processing forming die in the prior art generally has the disadvantage of requiring repeated multi-pass extrusion, resulting in low processing efficiency and high processing cost.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] An extrusion integrated forming die for magnesium alloys comprises a pair of forming dies, two pairs of die fastening bolt openings are provided on the two forming dies, the two forming dies are fixedly connected via the two pairs of die fastening bolt openings, a forming channel is provided in both the two forming dies, the forming channel comprises a feed port, a spherical expansion deformation zone, a reduced diameter thread torsion deformation zone, a discharge port and a discharge channel from top to bottom, 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 diameter and the bottom diameter of the spherical expansion and deformation zone are both D1, the longitudinal span of the spherical expansion and deformation zone is L1, the maximum lateral span of the spherical expansion and deformation zone is D2, the spherical expansion and deformation zone is symmetrical up and down with the maximum lateral span plane as the boundary, the curvature of the side wall of the spherical expansion and deformation zone is in the range of 0.002-0.02, the D1 is in the range of 20-40mm, and the L1 is in the range of 15-20mm.

[0008] Preferably, the top diameter of the torsional deformation zone of the reducing thread is D1, the longitudinal span of the torsional deformation zone of the reducing thread is L4, the angle between the two sides of the torsional deformation zone of the reducing thread and the vertical plane is R1, the value range of L4 is 8-13mm, and the value range of R1 is 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 3-7 mm.

[0010] Preferably, five thread grooves are evenly arranged on the side wall of the torsional deformation zone of the reducing thread, and the cross-sectional shape of each thread groove is a chord-cut circle.

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

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

[0013] (1) The integrated forming die of the present invention can realize expansion extrusion deformation, diameter reduction extrusion deformation and rotation extrusion deformation of the material to be processed by only a single processing, which greatly reduces the number of processing steps, thereby improving processing efficiency and reducing processing costs.

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

[0015] (3) The reduced-diameter thread torsional deformation zone provided in the present invention adopts the traditional reduced-diameter extrusion deformation, so that the processed material passes through the shearing zone to reduce the grain size and enhance the material strength. At the same time, the multiple thread grooves evenly arranged therein can cause the material to rotate and deform in the mold during the extrusion process, thereby increasing the material strength by intensifying the internal deformation of the material. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0017] Figure 2 It is a schematic diagram of the size calibration of the processing channel part in the present invention;

[0018] Figure 3 It is a schematic diagram of the dimension calibration of the cross section of the thread groove in the present invention;

[0019] The figure marks in the drawings of the specification include: 1. mold fastening bolt port; 2. forming mold; 3. discharge port; 4. feed port; 5. spherical expansion deformation zone; 6. reduced diameter thread torsional deformation zone; 7. discharge channel. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments:

[0021] Example:

[0022] like Figures 1 to 3 As shown, the present invention provides an extrusion integrated forming die for magnesium alloy, including a pair of forming dies 2, two pairs of die fastening bolt holes 1 are provided on the two forming dies 2, the two forming dies are fixedly connected by the two pairs of die fastening bolt holes 1, and a forming channel is provided in the two forming dies 2, and the forming channel includes a feed port 4, a spherical expansion deformation zone 5, a reduced diameter thread torsion deformation zone 6, a discharge port 3 and a discharge channel 7 from top to bottom, 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 diameter and the bottom diameter 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 up and down with the maximum lateral span plane as the boundary, the curvature of the side wall of the spherical expansion deformation zone 5 is in the range of 0.002-0.02, the D1 value range is 20-40mm, and the L1 value range is 15-20mm.

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

[0025] During the downward pressing process of the material, spherical coupling expansion is first performed in the spherical expansion deformation zone 5, and area 1 is filled through extrusion expansion; after the expansion is completed, it continues to be extruded downward, and then enters the shearing thread extrusion area of ​​area 2 downward. After expansion and shearing thread extrusion, the relative extrusion ratio is increased, the material deformation is more intense, the thread grooves twist and guide the material, and twist deformation occurs inside the mold, so that the stress is concentrated in the core area, the grain refinement effect is increased, and the dynamic recrystallization is better induced, and finally the performance of the magnesium alloy is improved.

[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, the ratio of D3 to D4 is 8:10, and the longitudinal span of the discharge port 3 is 3-7 mm.

[0027] like Figure 1 and Figure 3 As shown, five thread grooves are evenly arranged on the side wall of the reduced-diameter thread torsional deformation zone 6, and the cross-sectional shape of each thread groove is a chord-cut circle.

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

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

[0030] The two forming dies 2 are assembled through the die fastening bolt port 1, and the raw material to be extruded is placed into the feed port 4; the length and volume of the processed discharge bar are predicted, and a pressure head of appropriate length is selected, and the pressure head is adjusted to be directly above the feed port 4, and then the pressure head is moved downward in the vertical direction so that the pressure head squeezes the raw material to be extruded downward; the pressure head pushes the material downward under the influence of the work of the press, and the overall extrusion process needs to maintain a uniform extrusion speed; when the bottom end of the pressure head is 2-4mm away from the top plane of the spherical expansion deformation zone 5, the top end of the die contacts with the pressure head limiting structure, and the extrusion process ends. After the extruded raw material is completely discharged from the forming die 2 from the discharge channel 7 at the bottom of the discharge port 3, the two forming dies 2 are disassembled and the pressure head is reset, and a magnesium alloy processing is completed.

[0031] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. An extrusion integrated forming die for magnesium alloy, characterized in that: The invention comprises a pair of forming dies (2), each of which is provided with two pairs of die fastening bolt holes (1), and the two forming dies are fixedly connected via the two pairs of die fastening bolt holes (1). The two forming dies (2) are provided with a forming channel, and the forming channel comprises a feed port (4), a spherical expansion deformation zone (5), a reduced diameter thread torsion deformation zone (6), a discharge port (3) and a discharge channel (7) in order from top to bottom. 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).

2. The extrusion integrated forming die for magnesium alloy according to claim 1, characterized in that: The top diameter and the bottom diameter of the spherical expansion deformation zone (5) are both D1, the longitudinal span of the spherical expansion deformation zone (5) is L1, the maximum transverse span of the spherical expansion deformation zone (5) is D2, the spherical expansion deformation zone (5) is symmetrical up and down with the maximum transverse span plane as the boundary, the curvature of the side wall of the spherical expansion deformation zone (5) is in the range of 0.002-0.02, the D1 is in the range of 20-40 mm, and the L1 is in the range of 15-20 mm.

3. The extrusion integrated forming die for magnesium alloy according to claim 2, characterized in that: 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 range of L4 is 8-13 mm, and the value range of R1 is 120°-150°.

4. The extrusion integrated forming die for magnesium alloy 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, the ratio of D3 to D4 is 8:10, and the longitudinal span of the discharge port (3) is 3-7 mm.

5. The extrusion integrated forming die for magnesium alloy according to claim 4, characterized in that: Five thread grooves are evenly arranged on the side wall of the reduced-diameter thread torsional deformation zone (6), and the cross-sectional shape of each thread groove is a chord-cut circle.

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

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