Equal channel angle extruding machine

Abstract

The invention relates to the technical field of metal plastic processing, and discloses an equal channel angle extruder which comprises an extrusion wheel and a compaction wheel, the compaction wheel is located above the extrusion wheel, and the extrusion wheel is connected with a driving component; the side, close to the extrusion wheel, of the upper die is a first arc-shaped surface matched with the extrusion wheel, an extrusion groove is formed in the extrusion wheel in the circumferential direction, an arc-shaped groove is formed in the first arc-shaped surface of the upper die, and the arc-shaped groove and the extrusion groove jointly form an arc-shaped extrusion channel; the lower die is arranged below the upper die, a first horizontal groove is formed in the bottom of the upper die, a second horizontal groove corresponding to the first horizontal groove is formed in the top of the lower die, the first horizontal groove and the second horizontal groove jointly form a horizontal extrusion channel, and the side, close to the extrusion wheel, of the second horizontal groove is a spherical corner in smooth transition with the extrusion groove; the equal channel angle extruder can ensure that a pressurized material is uniformly stressed in the extrusion channel, the flow uniformity and the stability are high, and the defects of cracks, folding and the like of the extruded material are avoided, so that the quality of a formed product is improved.

Description

Technical Field

[0001] The invention relates to the technical field of metal plastic processing, in particular to an equal-diameter angular extruder. Background Art

[0002] Equal channel angular extrusion is a new large plastic deformation technology, which uses a die composed of two intersecting equal channel channels to make the metal obtain large plastic shear deformation. In practical applications, this process can perform multiple equal channel angular extrusion deformations on materials such as magnesium and magnesium alloys, further refine their structure, make the structure of pure magnesium and magnesium alloys finer, and thus improve their performance.

[0003] The equal-diameter angular extruder in the prior art is mostly composed of an extrusion die with an L-shaped extrusion channel, an extrusion rod and a press. During processing, a rod-shaped metal material is placed in the L-shaped extrusion channel in the extrusion die, and the extrusion rod is abutted against the top of the metal material. Under the action of the press, pressure is applied to the metal material through the extrusion rod to make the sample pass through the L-shaped extrusion channel to complete the equal-diameter angular extrusion. However, due to the L-shaped extrusion channel, this pressurization method causes uneven force on the rod-shaped metal material as a whole, which leads to poor flow uniformity and stability of the metal material in the extrusion channel, and is prone to defects such as cracks and folds, which in turn makes the quality of the molded product poor. Summary of the invention

[0004] The present invention proposes an equal-diameter angular extruder to solve the deficiencies in the above-mentioned prior art. The equal-diameter angular extruder can ensure that the pressurized material is subjected to uniform force, has high flow uniformity and stability in the extrusion channel, avoids defects such as cracks and folds in the extruded material, and thereby improves the quality of the molded product.

[0005] The technical solution of the present invention is: an equal-diameter angular extrusion machine, comprising an equal-diameter angular extrusion die and an extrusion feeding assembly, wherein the extrusion feeding assembly comprises an extrusion wheel and a compaction wheel, wherein the compaction wheel is located above the extrusion wheel, the extrusion wheel is connected to a driving component for driving the extrusion wheel to rotate, and a gap is provided between the extrusion wheel and the compaction wheel for the metal bar to be extruded to penetrate; the equal-diameter angular extrusion die comprises:

[0006] The upper die has a first arc surface on one side close to the extrusion wheel that matches the extrusion wheel, the extrusion wheel is provided with an extrusion groove in the circumferential direction, and the first arc surface of the upper die is provided with an arc groove, and the arc groove and the extrusion groove together constitute an arc extrusion channel;

[0007] The lower die is arranged below the upper die, the bottom of the upper die is provided with a first horizontal groove, the top of the lower die is provided with a second horizontal groove corresponding to the first horizontal groove, the first horizontal groove and the second horizontal groove together constitute a horizontal extrusion channel, and the side of the second horizontal groove close to the extrusion wheel is a spherical corner that smoothly transitions with the extrusion groove, the arc-shaped extrusion channel and the horizontal extrusion channel are connected to form an extrusion channel for equal-diameter angular extrusion of the metal bar to be extruded.

[0008] In at least one embodiment of the present disclosure, a second arcuate surface matching the arcuate surface of the compacting wheel is provided on the top of the upper mold, and the first arcuate surface smoothly transitions to the surface of the compacting wheel.

[0009] In at least one embodiment of the present disclosure, upper and lower corresponding grooves are provided on the inner walls of the first horizontal groove and the second horizontal groove on one side away from the arc-shaped extrusion channel, and the two grooves together constitute an expansion channel.

[0010] In at least one embodiment of the present disclosure, the rotation speed of the extrusion wheel is 0 r / min to 6 r / min.

[0011] In at least one embodiment of the present disclosure, the extrusion temperature is controlled at 350°C to 450°C.

[0012] In at least one embodiment of the present disclosure, a cooling channel is opened in the center of the extrusion wheel, and the cooling channel is used to set up a cooling water circuit.

[0013] In at least one embodiment of the present disclosure, it also includes a U-shaped frame, the extrusion wheel and the compaction wheel are both rotatably connected between the U-shaped frames, the rotating shaft of the extrusion wheel passes through the U-shaped frame and is connected to the driving component, the upper mold and the lower mold are arranged between the U-shaped frames and are located on the same side of the extrusion wheels, a pad is provided at the bottom of the lower mold in the U-shaped frame, a top plate is provided on the U-shaped frame, the top plate is located above the upper mold, a fixing bolt is longitudinally passed through the top plate, the fixing bolt is threadedly connected to the upper mold, and a support column is provided on the side of the U-shaped frame close to the upper mold.

[0014] In at least one embodiment of the present disclosure, the driving component includes: a motor, a high-speed reducer and a low-speed reducer, the motor is connected to the high-speed reducer, the high-speed reducer is connected to the low-speed reducer, and the low-speed reducer is connected to the extrusion wheel rotating shaft.

[0015] In at least one embodiment of the present disclosure, the output shaft of the low-speed reducer is connected to the extrusion wheel rotating shaft through an elastic sleeve pin coupling.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention provides an extrusion wheel with an extrusion groove, a compacting wheel, an upper die and a lower die. During the extrusion process, the extrusion wheel pre-extrudes the metal bar to be extruded before being fed into the die to prepare for die extrusion. The compacting wheel further compacts the pre-extruded material. The metal bar to be extruded is pressed by rotating the extrusion wheel and reversing the compacting wheel to pass through the corner of the transverse extrusion channel and the arc extrusion channel. The extrusion wheel and the compacting wheel can provide a stable propulsion force for the flow of the metal material in the transverse extrusion channel and the arc extrusion channel, and improve the flow uniformity and stability of the metal bar in the transverse extrusion channel and the arc extrusion channel. Moreover, since the corner of the transverse extrusion channel and the arc extrusion channel is spherical, the spherical corner reduces the contact area between the material and the side wall of the transverse extrusion channel, provides a smoother transition channel for the material, and thus reduces the friction resistance of the material at the corner, reduces the blockage and accumulation of the material at the corner, reduces the concentrated stress generated during the extrusion process, increases the compressive stress, avoids the extruded material from having defects such as cracks and folds, and improves the quality of the final product.

[0018] 2. The present invention arranges an expansion channel between the transverse extrusion channels, which improves the fluidity and microstructure quality of the material, reduces the generation of defects, and reduces the difficulty of mold demolding; at the same time, the coordination of the spherical corner and the expansion channel can enhance the uniformity of the plastic deformation of the material and reduce the damage of the material in the extrusion process, so that the performance of the metal bar is further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the structure of the extruder of the present invention;

[0021] Figure 3 It is a schematic diagram of the front and cross-sectional structure of the extruder of the present invention;

[0022] Figure 4 It is a schematic diagram of the cross-sectional structure of the mold of the present invention;

[0023] Figure 5 It is a schematic diagram of the side structure of the mold of the present invention;

[0024] Figure 6 This is a damage stress diagram of pure magnesium as the extrusion simulation analysis object of the present invention;

[0025] Figure 7 This is the equivalent strain diagram of the present invention using pure magnesium as the extrusion simulation analysis object.

[0026] Description of reference numerals:

[0027] 1. Driving component; 11. Motor; 12. High-speed reducer; 13. Low-speed reducer; 2. U-shaped frame; 21. Top plate; 211. Fixing bolts; 3. Extrusion wheel; 31. Extrusion groove; 4. Compacting wheel; 5. Upper die; 51. Arc groove; 52. First transverse groove; 6. Lower die; 61. Second transverse groove; 62. Expansion channel; 7. Pad; 8. Support column. DETAILED DESCRIPTION

[0028] The drawings in this disclosure are not drawn strictly according to the actual scale, and the specific size and quantity of each structure can be determined according to actual needs. The drawings described in this disclosure are only schematic diagrams of the structures.

[0029] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Unless otherwise defined, the technical or scientific terms used herein shall have the usual meanings understood by persons of ordinary skill in the field to which the invention belongs. The words "first", "second" and similar words used in the patent application specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Inside", "outside", "up", "down", "far", "near", "front", "back" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0031] The present invention proposes an equal-diameter angular extruder, which can ensure that the pressurized material is subjected to uniform force, has high flow uniformity and stability in the extrusion channel, avoids defects such as cracks and folds in the extruded material, thereby improving the quality of the molded product, and can be used for continuous molding, adapting to large-scale production needs.

[0032] Combination Figures 1 to 7 As shown, an equal-diameter angular extrusion machine includes an equal-diameter angular extrusion die and an extrusion feeding assembly, the extrusion feeding assembly includes an extrusion wheel 3 and a compaction wheel 4, the compaction wheel 4 is located above the extrusion wheel 3, the extrusion wheel 3 is connected to a driving component 1 for driving the extrusion wheel 3 to rotate, and there is a gap between the extrusion wheel 3 and the compaction wheel 4 for the metal bar to be extruded to penetrate; the equal-diameter angular extrusion die includes:

[0033] The side of the upper die 5 close to the extrusion wheel 3 is a first arc surface matched with the extrusion wheel 3. The extrusion wheel 3 is provided with an extrusion groove 31 along the circumferential direction. The first arc surface of the upper die 5 is provided with an arc groove 51. The arc groove 51 and the extrusion groove 31 together constitute an arc extrusion channel.

[0034] The lower die 6 is arranged below the upper die 5, and a first horizontal groove 52 is provided at the bottom of the upper die 5, and a second horizontal groove 61 corresponding to the first horizontal groove 52 is provided at the top of the lower die 6. The first horizontal groove 52 and the second horizontal groove 61 together constitute a horizontal extrusion channel, and the side of the second horizontal groove 61 close to the extrusion wheel 3 is a spherical corner that smoothly transitions with the extrusion groove 31. When the rod-shaped metal material passes through the spherical corner, the contact area between the material and the side wall of the transverse extrusion channel is reduced, and the contact area between the material and the die can be reduced, thereby reducing friction resistance, and also helping to reduce the blockage and accumulation of the material at the corner, thereby improving the stability and efficiency of the extrusion process; and reducing the tensile stress borne by the rod-shaped metal material and increasing its compressive stress. The rod-shaped metal material will experience approximately ideal pure shear deformation; this deformation will further refine the internal grains of the metal material and may form large-angle grain boundaries. The arc-shaped extrusion channel and the horizontal extrusion channel are connected to form an extrusion channel for equal-diameter angular extrusion of the metal bar to be extruded.

[0035] As an alternative embodiment, the top of the upper mold 5 is provided with a second arcuate surface matching the arcuate surface of the compacting wheel 4. The second arcuate surface is close to the compacting wheel 4 but does not abut against the compacting wheel 4 to avoid affecting the rotation of the compacting wheel 4. The first arcuate surface and the surface of the compacting wheel 4 have a smooth transition. The limitation of the smooth transition enables the metal bar to be extruded to smoothly enter the arcuate extrusion channel.

[0036] As an alternative embodiment, the inner walls of the first horizontal groove 52 and the second horizontal groove 61 are both provided with corresponding grooves on the side away from the arc-shaped extrusion channel, and the two grooves together constitute an expansion channel 62; this expansion channel 62 improves the fluidity and microstructure quality of the material, reduces the generation of defects, and reduces the difficulty of mold demolding. The setting of the expansion channel 62 can change the path of the blank bar during the extrusion process, strengthen the shearing effect, and at the same time, the spherical corner and the expansion channel enhance the uniformity of the plastic deformation of the material and reduce the damage of the material during the extrusion process, so as to improve the performance of the metal bar.

[0037] As an alternative embodiment, the rotation speed of the extrusion wheel 3 is 0 r / min to 6 r / min. When the extruder is in working state, the rotation speed of the extrusion wheel 3 is greater than 0 r / min and less than 6 r / min. When the extruder is in non-working state, the rotation speed of the extrusion wheel 3 is 0 r / min.

[0038] As an alternative embodiment, the extrusion temperature is controlled at 350°C to 450°C. In order to ensure a good grain refinement effect inside the metal material, the mold can be heated at the beginning of the extrusion process to ensure that the temperature is greater than 350°C. During the extrusion process, the extrusion deformation of the metal material will generate a lot of heat. If the temperature exceeds 450°C, technical means must be taken to cool the metal material.

[0039] Specifically, the equal-diameter angular extruder proposed in the present invention uses pure magnesium wire with a purity of 99.95% and a diameter of 10 mm as the extrusion simulation analysis object, the extrusion temperature is 400 degrees, and the main physical and chemical parameters of pure magnesium are: density 1.78g / cm 3 , melting point 650℃, thermal expansion coefficient 2.2×10 -5 , elastic modulus 44.2GPa, Poisson's ratio 0.27.

[0040] The flow stress-strain equation for pure magnesium is as follows:

[0041]

[0042] In the above formula: A, α--constants related to materials, A = 17800, α = 0.02112

[0043] ΔH--deformation activation energy (J / mol), = 98000J;

[0044] n--stress index, n=6.5

[0045] R--gas constant, R = 8.314 (mol.k)

[0046] The thermal deformation constitutive equation of pure magnesium in the simulation analysis is:

[0047] ε=6.5454×10 14 [sinh(ε σ)] 3.3702 exp[-210775 / RT]

[0048] This study conducted a comprehensive study on the damage analysis of the bar section after extrusion, as shown in the attached manual. Figure 6 As shown, histograms are further used to count and display the data distribution characteristics of equivalent strain, so as to enhance the readability and interpretation of the results.

[0049] According to the simulation results, the damage value on the cross section of the bar ranges from 0.00 to a maximum value of 0.363, which reveals the spatial heterogeneity of the degree of damage during the extrusion process. It is worth noting that the maximum damage occurs in the feeding area where the extrusion wheel and the compaction wheel meet, which is the most severely damaged part due to the significant tensile stress. This finding is of great significance for understanding the behavior of materials in areas of high stress concentration, suggesting that special attention should be paid to this area in actual production to prevent premature failure.

[0050] In addition, an innovative design was adopted in the corner processing in the study, that is, a spherical transition area was set up to alleviate the stress concentration phenomenon. The simulation results verified the effectiveness of the design. The damage level in this area was controlled at about 0.145, which was significantly lower than the maximum damage value, indicating that material damage can be effectively regulated and reduced through structural optimization. More importantly, all measured damage values ​​did not exceed the damage tolerance of magnesium alloy 0.4, which confirmed that under the extrusion process parameters simulated in this simulation, the damage of the bar was controlled within a safe range.

[0051] This study conducted a comprehensive study on the equivalent strain field of the bar section after extrusion, as shown in the attached manual. Figure 7 As shown, histograms are further used to count and display the data distribution characteristics of equivalent strain, so as to enhance the readability and interpretation of the results.

[0052] The simulation results show that the equivalent effect variables on the cross section show significant spatial variability, with the maximum value reaching 8.14 and the minimum value being 0.00. This significant range reveals the uneven distribution characteristics of stress and strain during the extrusion process. In particular, since a spherical corner is designed at the corner, the extrusion corner area becomes the location where the maximum value of the equivalent effect strain appears due to the complexity of the geometric configuration and the resulting high stress concentration phenomenon. As the equivalent effect strain increases, the rod undergoes work hardening, that is, the strength and hardness of the material will increase accordingly, increasing the fatigue and fracture resistance of the rod.

[0053] In addition, the die design intentionally incorporates an expansion channel 62 in the discharge port to optimize material flow and reduce stress concentration at the outlet. The equivalent strain value in the expansion channel 62 is controlled within a relatively mild range, specifically between 3.05 and 4.07. This design not only effectively alleviates the problem of local excessive strain during the extrusion process, but may also have a positive impact on improving the final mechanical properties and surface quality of the product.

[0054] In summary, this study systematically analyzed the equivalent strain distribution characteristics during the extrusion process of pure magnesium bars, especially providing valuable insights into the design considerations of the corner high pressure zone and the die expansion area.

[0055] As an alternative embodiment, a cooling channel is opened in the center of the extrusion wheel 3, and the cooling channel is used to set up a cooling water circuit. Specifically, a cooling water circuit is added to the core of the pressing wheel, with water entering at the head and exiting at the tail. The setting of the cooling water circuit prevents the bearing from locking due to high temperature, and fundamentally solves the problem of high temperature blocking; thereby ensuring the rotation stability of the extrusion wheel 3, making the flow of metal material in the extrusion channel more stable.

[0056] As an alternative embodiment, it also includes a U-shaped frame 2, the extrusion wheel 3 and the compaction wheel 4 are both rotatably connected between the U-shaped frame 2, the rotating shaft of the extrusion wheel 3 passes through the U-shaped frame 2 and is connected to the driving component 1, the upper mold 5 and the lower mold 6 are arranged between the U-shaped frame 2 and are located on the side of the extrusion wheel 3, and a cushion block 7 is provided at the bottom of the lower mold 6 in the U-shaped frame 2, and a top plate 21 is provided on the U-shaped frame 2, and the top plate 21 is located above the upper mold 2, and a fixing bolt 211 is longitudinally passed through the top plate 21, and the fixing bolt 211 is threadedly connected to the upper mold 5, and a support column 8 is provided on the side of the U-shaped frame 2 close to the upper mold 5; this structural form of the equal-diameter angular extruder is easy to assemble, disassemble and clean, so as to reduce the production preparation time and maintenance time, and the cushion block 7 can reduce the vibration of the entire mold.

[0057] As an alternative embodiment, the driving component 1 includes: a motor 11, a high-speed reducer 12 and a low-speed reducer 13, the motor 11 is connected to the high-speed reducer 12, the high-speed reducer 12 is connected to the low-speed reducer 13, and the low-speed reducer 13 is connected to the rotating shaft of the extrusion wheel 3; specifically, the motor 11 is a variable frequency speed regulating three-phase asynchronous motor, in view of the non-adjustable speed of the traditional equal-diameter angular extrusion, the rated torque of the motor can be kept unchanged when the motor speed is changed, the high-speed reducer 12 is a two-stage unfolded helical gear reducer, and the low-speed reducer 13 is a two-stage unfolded spur gear reducer, and its main functions are:

[0058] 1. Speed ​​reduction: Through multi-stage expansion, this reducer can reduce the speed and increase the torque, which helps to improve the working efficiency of the machine.

[0059] 2. Speed ​​change: By changing the transmission ratio, output at different speeds can be achieved to meet different work requirements.

[0060] 3. Power transmission: As an important component of the transmission device, the reducer can transmit the power generated by the motor to the extrusion equipment.

[0061] 4. Reduce impact: Due to its structural characteristics, the reducer can reduce the impact of mechanical operation to a certain extent and improve the stability and life of the machinery.

[0062] As the entrance part of the transmission system, the two-stage unfolded helical gear reducer is responsible for converting the high-speed and low-torque power of the motor into medium-speed and medium-torque power output. The two-stage unfolded spur gear reducer further reduces the speed output from the first-stage reducer and amplifies the torque, and finally transmits the power to the equal-diameter angular extrusion die.

[0063] The reducer designed by the present invention takes into account the design principles of low speed and high torque, minimum volume and equal strength. Through two series-combined transmission reducers, the transmission ratio is distributed according to the principle of approximately 1:1, and the two-stage transmission ratio inside each reducer is distributed according to the principle of approximately 1.3:1. The total maximum reduction ratio can reach 625, ensuring the requirements of equal strength, minimum volume and large reduction ratio.

[0064] As an alternative embodiment, the output shaft of the low-speed reducer 13 is connected to the rotating shaft of the extrusion wheel 3 through an elastic sleeve pin coupling; the elastic pin coupling is a pin made of a plurality of non-metallic elastic materials, which is placed in the flange holes of the two half couplings, and the two half couplings are connected by the pin. This coupling has a simple structure, is easy to manufacture, and is convenient to install and replace the elastic elements without moving the two couplings; the selection of the elastic sleeve pin coupling can reduce the impact of the noise and impact of the extrusion process on the reducer, and absorb the medium and high frequency noise caused by the vibration excitation of the working machine to ensure that the rotation of the extrusion wheel 3 is more stable.

[0065] Working principle and use method of the present invention:

[0066] The present invention provides an equal-diameter angular extruder. When the equal-diameter angular extruder is in use, first, an electric motor is used as a power source to provide rotational power. The output power of the electric motor is reduced in speed and torque through a two-stage unfolded helical cylindrical gear reducer and a two-stage unfolded spur cylindrical gear reducer, and the power of the electric motor is transmitted to an extrusion wheel 3. The extrusion wheel 3 pre-extrudes the metal material before it is fed into a mold to prepare for mold extrusion. The compacting wheel 4 further compacts the pre-extruded material. Through the rotation of the extrusion wheel 3 and the reverse rotation of the compacting wheel 4, pressure is applied to the pure magnesium rod material so that it passes through the corner of the transverse extrusion channel and the arc extrusion channel, and then enters the transverse extrusion, and passes through the expansion channel 62 in the transverse extrusion channel. The design of the expansion channel 62 helps to release the residual stress accumulated in the material during the extrusion process, and finally completes the extrusion process.

[0067] The above embodiments are only specific implementation methods of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above embodiments, ordinary technicians in this field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions for implementing the present invention, and should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An equal-diameter angular extruder, characterized in that: The invention comprises an equal-diameter angular extrusion die and an extrusion feeding assembly, wherein the extrusion feeding assembly comprises an extrusion wheel (3) and a compaction wheel (4), wherein the compaction wheel (4) is located above the extrusion wheel (3), the extrusion wheel (3) is connected to a driving component (1) for driving the extrusion wheel (3) to rotate, and a gap is provided between the extrusion wheel (3) and the compaction wheel (4) for the metal bar to be extruded to penetrate; the equal-diameter angular extrusion die comprises: The upper die (5) has a first arcuate surface on one side close to the extrusion wheel (3) and matched with the extrusion wheel (3). The extrusion wheel (3) is provided with an extrusion groove (31) along the circumferential direction. The first arcuate surface of the upper die (5) is provided with an arcuate groove (51). The arcuate groove (51) and the extrusion groove (31) together form an arcuate extrusion channel. The lower die (6) is arranged below the upper die (5), the bottom of the upper die (5) is provided with a first horizontal groove (52), the top of the lower die (6) is provided with a second horizontal groove (61) corresponding to the first horizontal groove (52), the first horizontal groove (52) and the second horizontal groove (61) together constitute a horizontal extrusion channel, and the side of the second horizontal groove (61) close to the extrusion wheel (3) is a spherical corner that smoothly transitions with the extrusion groove (31), and the arc-shaped extrusion channel and the horizontal extrusion channel are connected to form an extrusion channel for performing equal-diameter angular extrusion on the metal bar to be extruded.

2. An equal-diameter angular extruder as claimed in claim 1, characterized in that: The top of the upper mold (5) is provided with a second arc surface matching the arc surface of the compacting wheel (4), and the first arc surface smoothly transitions to the surface of the compacting wheel (4).

3. An equal-diameter angular extruder as claimed in claim 1, characterized in that: Upper and lower corresponding grooves are also provided on the inner walls of the first horizontal groove (52) and the second horizontal groove (61) on the side away from the arc-shaped extrusion channel, and the two grooves together constitute the expansion channel (62).

4. An equal-diameter angular extruder as claimed in claim 1, characterized in that: The rotation speed of the extrusion wheel (3) is 0 r / min to 6 r / min.

5. An equal-channel angular extruder as claimed in claim 1, characterized in that: The extrusion temperature is 350°C to 450°C.

6. An equal-channel angular extruder as claimed in claim 1, characterized in that: A cooling channel is provided at the center of the extrusion wheel (3), and the cooling channel is used to set a cooling water circuit.

7. An equal-diameter angular extruder as claimed in claim 1, characterized in that: The invention also comprises a U-shaped frame (2), wherein the extrusion wheel (3) and the compaction wheel (4) are both rotatably connected between the U-shaped frame (2), the rotation axis of the extrusion wheel (3) passes through the U-shaped frame (2) and is connected to the driving component (1), the upper die (5) and the lower die (6) are arranged between the U-shaped frame (2) and are located on the same side of the extrusion wheel (3), a cushion block (7) is provided at the bottom of the lower die (6) in the U-shaped frame (2), a top plate (21) is provided on the U-shaped frame (2), the top plate (21) is located above the upper die (2), a fixing bolt (211) is longitudinally passed through the top plate (21), and the fixing bolt (211) is threadedly connected to the upper die (5), and a support column (8) is provided on the side of the U-shaped frame (2) close to the upper die (5).

8. An equal-channel angular extruder as claimed in claim 1, characterized in that: The driving component (1) comprises: a motor (11), a high-speed reducer (12) and a low-speed reducer (13); the motor (11) is connected to the high-speed reducer (12); the high-speed reducer (12) is connected to the low-speed reducer (13); and the low-speed reducer (13) is connected to the rotating shaft of the extrusion wheel (3).

9. An equal-channel angular extruder as claimed in claim 8, characterized in that: The output shaft of the low-speed reducer (13) is connected to the rotating shaft of the extrusion wheel (3) via an elastic sleeve pin coupling.

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