An asymmetric bearing ring cold extrusion forming die

Abstract

The present application relates to the technical fields of bearing ring cold extrusion forming, in particular to a kind of asymmetric bearing ring cold extrusion forming die, including die holder, upper die body and lower die body, the middle part of the upper end surface of die holder is provided with die mounting table, die mounting hole is coaxially arranged in die mounting table;The present application is provided with wedge-shaped block in die mounting hole by setting die mounting hole on die holder, and the radial extrusion force of wedge-shaped block to upper die body and lower die body is changed by the axial movement of wedge-shaped block, the quick installation and fixation of die are realized, and convenient disassembly, so as to improve the disassembly efficiency of die, and the stability and service life of die after installation are guaranteed, the die holder and upper die body, die holder and lower die body are designed as split structure, effectively reduce the weight required to be loaded in the process of die disassembly, further improve the disassembly efficiency of cold extrusion forming die.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bearing ring cold extrusion forming, in particular to a kind of asymmetric bearing ring cold extrusion forming die. BACKGROUND

[0002] Cold extrusion forming process has become the mainstream process method for mass production of bearing outer ring due to its high material utilization, excellent mechanical properties and high production efficiency. The outer ring of tapered roller bearing is of asymmetric structure, and the material utilization is too low if mechanical cutting process is used, which increases the production cost of tapered roller bearing outer ring. Therefore, cold extrusion forming process is particularly suitable for the production of tapered roller bearing outer ring to meet the precision requirements, production cost control requirements and mass production efficiency of tapered roller bearing outer ring.

[0003] To control equipment investment cost, a cold extrusion process line in a bearing factory usually needs to produce tapered roller bearing outer rings of multiple specifications. Different sizes of tapered roller bearing outer rings are different in size, so different size cold extrusion forming dies need to be replaced during production to produce tapered roller bearing outer rings of different sizes. The existing cold extrusion forming die usually fastens each component by bolts. Although this design can meet the requirements of fastening, positioning and running stability of the die, the bolt connection method takes a long time to disassemble and adjust after installation to ensure the fitting accuracy between the upper and lower dies. Moreover, the overall weight of each die is large, which makes it inconvenient to replace and adjust during operation, thereby affecting the production efficiency.

[0004] Therefore, how to ensure stable connection of the die while reducing disassembly time and overall weight has become a problem to be solved in the field of cold extrusion forming die design. SUMMARY

[0005] The present application aims to provide an asymmetric bearing ring cold extrusion forming die to solve the problem of low disassembly efficiency of the existing asymmetric bearing ring cold extrusion forming die, heavy weight of the cold extrusion forming die, inconvenience of adjustment after installation, and low production efficiency of the bearing ring.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0007] The application discloses an asymmetric bearing ring cold extrusion forming die, which comprises a die seat, an upper die body and a lower die body, a die mounting table is arranged on the middle part of the upper end face of the die seat, a die mounting hole is coaxially arranged in the die mounting table, the number of the die seat is two, the upper and lower die seats are oppositely arranged, the upper die body is coaxially arranged in the die mounting hole of the upper die seat, the lower die body is coaxially arranged in the die mounting hole of the lower die seat, a positioning conical surface is arranged on the outer side wall of the upper die body and the lower die body, a plurality of wedge-shaped blocks are slidably arranged in the die mounting hole, the wedge-shaped blocks are distributed along the axial circumference of the die mounting hole, an inner conical surface is arranged on the inner side wall of each wedge-shaped block, the small end of the inner conical surface is on the upper side, the inner conical surface has the same taper as the positioning conical surface, and the inner conical surface is slidably connected with the positioning conical surface, the outer side wall of each wedge-shaped block is slidably connected with the inner side wall of the die mounting hole, a driving assembly is hingedly arranged on the lower end face of each wedge-shaped block, and the driving assembly is designed to provide downward pulling force for the wedge-shaped blocks.

[0008] When the driving assembly is started, the driving assembly provides downward pulling force for the wedge-shaped blocks, the inner conical surface of the wedge-shaped block is slidably connected with the positioning conical surface, the inner conical surface of the wedge-shaped block is slidably connected with the positioning conical surface when the wedge-shaped block moves downward, the inner conical surface of the wedge-shaped block generates extrusion force on the positioning conical surface in the direction of the center of the die mounting hole, so that the upper die body and the lower die body are fixed in the die mounting hole, thereby realizing rapid installation and fixation of the die. When the die needs to be disassembled, the driving assembly is turned off, the extrusion force of the wedge-shaped block on the positioning conical surface is released, the wedge-shaped block is rotated along the hinge joint between the wedge-shaped block and the driving assembly, the wedge-shaped blocks are unfolded, and the upper die body or the lower die body can be taken out of the die mounting hole, so that the disassembly time is greatly shortened, the die is more convenient to debug and calibrate after installation, and the production efficiency of the cold extrusion forming die is improved. Meanwhile, the die seat, the upper die body and the lower die body are designed as a split structure, only the upper die body or the lower die body needs to be disassembled during disassembly, the weight required during the die disassembly process is effectively reduced, and the disassembly efficiency of the cold extrusion forming die is further improved. In addition, through the arrangement of the wedge-shaped blocks, after the cold extrusion forming die is installed, the outer side wall of the wedge-shaped block is attached to the inner side wall of the die mounting hole, the inner conical surface on the inner side wall of the wedge-shaped block is attached to the positioning conical surface, the outer ring of the tapered roller bearing is sleeved in the cold extrusion forming process, the radial extrusion force acting on the upper die body or the lower die body is transmitted to the die mounting table through the wedge-shaped block, a complete circle is formed by the wedge-shaped blocks, the radial extrusion force is uniformly dispersed, the radial dimension stability of the upper die body and the lower die body after the radial dimension is reduced is ensured, and the stability and service life of the cold extrusion forming die are ensured.

[0009] Preferably, the driving assembly comprises a hydraulic rod, the lower end surface of the die holder is provided with a hydraulic groove, the lower end surface of the die holder is fixedly connected with a sealing plate through bolts, the upper end surface of the sealing plate and the inner side wall of the hydraulic groove form a hydraulic cavity, the hydraulic cavity is communicated with the hydraulic power element through a hydraulic pipe, the bottom wall of the mold mounting hole is provided with the same number of piston holes as the wedge blocks, the hydraulic rod is coaxially and slidingly installed in the piston hole, the lower end surface of the wedge block is provided with a connecting block mounting groove, the connecting block mounting groove is fixedly installed with a connecting block, the upper end of the hydraulic rod extends into the mold mounting hole, and the upper end of the hydraulic rod is hingedly connected with the lower end of the connecting block.

[0010] The hydraulic power element is started, the hydraulic oil in the hydraulic cavity is extracted, the hydraulic oil in the hydraulic cavity forms negative pressure, the hydraulic rod moves downward under the action of the negative pressure of the hydraulic oil, so as to drive the wedge block to move downward, and the quick fixing of the upper die body and the lower die body is realized. When it is needed to release the fixing, the hydraulic power element works reversely, the hydraulic oil is injected into the hydraulic cavity, the hydraulic rod moves upward under the action of the pressure of the hydraulic oil, and then the wedge block moves upward, so as to release the fixing of the upper die body and the lower die body. This design not only simplifies the disassembly and assembly process of the mold, improves the disassembly and assembly efficiency, but also guarantees the stability and service life of the mold.

[0011] Preferably, the hydraulic power element comprises an adjusting bolt, the upper end surface of the die holder is provided with a bolt mounting table, the bolt mounting table is coaxially installed with a bolt mounting hole, the adjusting bolt is threadedly connected in the bolt mounting hole, the upper end of the adjusting bolt extends to the upper side of the bolt mounting table, the lower end of the die holder is provided with a communication groove, and the bolt mounting hole and the hydraulic cavity are communicated through the communication groove.

[0012] When the adjusting bolt is rotated upward, the hydraulic oil containing space in the bolt mounting hole is increased, and due to the communication effect of the communication groove, the hydraulic oil in the hydraulic cavity flows into the bolt mounting hole, so that the volume of the hydraulic oil in the hydraulic cavity is reduced and the pressure is reduced, thereby making the hydraulic rod move downward under the action of negative pressure, and realizing the rapid fixing of the upper die body and the lower die body. When it is necessary to release the fixing, the adjusting bolt is rotated downward, the hydraulic oil containing space in the bolt mounting hole is reduced, thereby part of the hydraulic oil in the hydraulic cavity is extruded into the bolt mounting hole, the volume of the hydraulic oil in the hydraulic cavity is increased, the pressure is increased, the hydraulic rod is pushed to move upward, and then the wedge block is moved upward, thereby releasing the fixing of the upper die body and the lower die body. This design makes the fixing and releasing process of the mold more convenient, and further improves the disassembly and assembly efficiency of the mold. Further, by using the adjusting bolt as a hydraulic power element, not only the manufacturing cost of the equipment is reduced, but also the safety hidden danger caused by the use of electric driving element is avoided, and the safety performance of the equipment is improved. At the same time, the operation of the adjusting bolt is simple and convenient, and a complex electrical control system is not needed, so that the fixing and releasing process of the mold is more intuitive and easy to understand, and it is convenient for operators to master and use. In addition, the reliability and durability of the adjusting bolt are high, which can adapt to long-time and high-frequency use requirements, and ensures the stable operation and long service life of the cold extrusion forming die.

[0013] Preferably, the inner side wall of the mold mounting hole is provided with a supporting taper surface on the upper side, the outer side wall of each of the plurality of wedge blocks is provided with an outer taper surface, the lower end of the outer taper surface is on the lower side, the taper of the outer taper surface is the same as that of the supporting taper surface, and the outer taper surface and the supporting taper surface are in sliding connection, and the taper of the inner taper surface is smaller than that of the outer taper surface.

[0014] The sliding connection design of the outer taper surface and the supporting taper surface not only enhances the stability of the wedge block in the mold mounting hole, but also effectively prevents the wedge block from deviating or shaking during the stress process, further ensuring the stability and service life of the mold. At the same time, the taper of the inner taper surface is smaller than that of the outer taper surface, so that the extrusion force between the inner taper surface and the positioning taper surface gradually increases when the wedge block moves downward, thereby realizing a more compact fixing of the upper die body and the lower die body. This design not only improves the fixing effect of the mold, but also makes the debugging and calibration process of the mold after installation more convenient, further improving the production efficiency of the cold extrusion forming die. In addition, through the setting of the supporting taper surface, after the cold extrusion forming die is installed, the outer taper surface on the outer side wall of the wedge block is in contact with the supporting taper surface, forming an additional supporting structure. During the cold extrusion forming process of the outer ring of the tapered roller bearing, if the upper die body or the lower die body is subjected to abnormal radial extrusion force, this additional supporting structure can effectively disperse and relieve this part of the extrusion force, further ensuring the stability and safety of the mold.

[0015] Preferably, a plurality of screw mounting holes are formed on the outer side wall of the mold mounting table, the number of the plurality of screw mounting holes is the same as the number of the wedge blocks, a round head screw is coaxially bolted in each of the plurality of screw mounting holes, the round head screw comprises a threaded segment, a light axis segment and a ball head, the threaded segment is threadedly connected with the screw mounting hole, the light axis segment is arranged between the threaded segment and the ball head, the ball head extends into the mold mounting hole, a guide groove is formed on the outer conical surface, the guide groove is formed in a direction parallel to the generatrix of the outer conical surface, the ball head is slidingly connected in the guide groove, and the ball head and the guide groove are in clearance fit.

[0016] When the wedge block is subjected to the downward pulling force of the hydraulic rod, the wedge block moves downward, the ball head is slidingly connected in the guide groove, the ball head produces a limiting effect on the wedge block, and the outer conical surface remains in the state of being attached to the supporting conical surface, so that the wedge block is prevented from being deflected or tilted during the force process, and the stability and the directivity of the wedge block in the mold mounting hole are further enhanced. In addition, the clearance fit design between the ball head and the guide groove enables the wedge block to have a certain floating ability during the downward movement, so that the wedge block can better adapt to the slight deformation or error in the mold mounting hole, and the installation precision and the stability of the mold are further improved. When the wedge block is subjected to the upward pushing force of the hydraulic rod, the wedge block moves upward, and the wedge block can be smoothly and smoothly unfolded through the sliding of the ball head in the guide groove, so that the upper mold body and the lower mold body can be easily taken out of the mold mounting hole. Not only the convenience of mold disassembly is improved, but also the integrity and safety of the mold during disassembly are ensured, and the damage or deformation of the mold caused by improper disassembly is avoided. At the same time, the cooperation design of the ball head and the guide groove also enhances the directivity of the mold during the installation and disassembly process, so that the installation and disassembly process of the mold is more accurate and efficient.

[0017] Preferably, a connecting rod is arranged between the connecting block and the hydraulic rod, the upper end of the connecting rod is hingedly connected with the lower end of the connecting block through a pin, and the lower end of the connecting rod is hingedly connected with the upper end of the hydraulic rod through a pin.

[0018] Through the arrangement of the connecting rod, the hydraulic rod can more stably and uniformly transmit force when pushing or pulling the wedge block, so that uneven deformation or damage of the wedge block during the force process is avoided, and the stability and the service life of the mold are further improved. At the same time, the hinge design between the connecting rod and the connecting block and the hydraulic rod enables the wedge block to have a certain floating and self-adapting ability during the upward and downward movement, so that the wedge block can better adapt to the slight deformation or error in the mold mounting hole, thereby ensuring the installation precision and the stability of the mold.

[0019] Preferably, a connecting bolt mounting hole is formed in the upper end surface of the wedge-shaped block, the lower end of the connecting bolt mounting hole penetrates the connecting block mounting groove, a threaded hole coaxial with the connecting bolt mounting hole is arranged on the upper end surface of the connecting block, and a connecting bolt is threadedly connected in the connecting bolt mounting hole.

[0020] In the installation of the wedge-shaped block, the connecting rod is first hingedly installed with the hydraulic rod through the pin, and then the connecting rod is hingedly installed with the connecting block through the pin. After the above installation is completed, the wedge-shaped block is inserted into the mold mounting hole, and the connecting block is inserted into the connecting block mounting groove at the lower end of the wedge-shaped block. The connecting bolt is inserted into the connecting bolt mounting hole and screwed down, so that the lower thread of the connecting bolt is threadedly connected with the threaded hole on the connecting block, thereby mechanically connecting the wedge-shaped block, the connecting block and the hydraulic rod. This connection method not only facilitates the disassembly and replacement of the wedge-shaped block, but also is firm and ensures the stability and long service life of the mold during cold extrusion forming. At the same time, the rotation depth of the connecting bolt can be adjusted by a gasket of different thickness between the connecting bolt and the wedge-shaped block, thereby realizing fine adjustment of the position of the wedge-shaped block and ensuring the close fit between the inner tapered surface of the wedge-shaped block and the positioning tapered surface, further improving the installation accuracy and stability of the mold. In addition, the connecting bolt facilitates pre-tightening of the wedge-shaped block.

[0021] Preferably, the bottom wall of the mold mounting hole is provided with an axial positioning seat, and an installation groove is arranged between the inner side wall of the mold mounting hole and the axial positioning seat.

[0022] The axial positioning seat is arranged to axially position the hydraulic rod and prevent axial movement of the hydraulic rod in the mold mounting hole, thereby ensuring the stability and accuracy of the hydraulic rod when pushing or pulling the wedge-shaped block. At the same time, the installation groove arranged between the inner side wall of the mold mounting hole and the axial positioning seat provides installation space for the connection between the hydraulic rod, the connecting rod and the connecting block, which is beneficial to the maintenance and replacement of the hydraulic rod, the connecting rod and the connecting block.

[0023] Compared with the prior art, the present application has the following advantages:

[0024] 1. This invention achieves rapid installation and fixation of the mold, as well as convenient disassembly, by setting mold mounting holes on the mold base and placing wedge blocks inside the mold mounting holes. Through the axial movement of the wedge blocks, the radial extrusion force of the wedge blocks on the upper mold body and the lower mold body is changed, thereby improving the mold assembly and disassembly efficiency and ensuring the stability and service life of the mold after installation. The mold base and the upper mold body, and the mold base and the lower mold body are designed as separate structures, which effectively reduces the weight required for mold disassembly and further improves the assembly and disassembly efficiency of cold extrusion forming molds.

[0025] 2. The present invention, through the sliding connection design of the supporting cone surface and the outer cone surface, and the design that the taper of the inner cone surface is smaller than that of the outer cone surface, not only enhances the stability of the wedge block in the mold mounting hole, but also effectively prevents the wedge block from shifting or shaking during the force process, further ensuring the stability and service life of the mold, while also improving the fixing effect of the mold, making the debugging and calibration process of the mold after installation more convenient.

[0026] 3. The design of the round-headed screw and the guide groove enhances the stability and guidance of the wedge block during the force process. At the same time, it enables the wedge block to have a certain floating ability during the up and down movement, which can better adapt to the small deformations or errors in the mold mounting hole, and further improve the installation accuracy and stability of the mold.

[0027] 4. The connecting rod design allows the hydraulic rod to transmit force more smoothly and evenly when pushing or pulling the wedge block, avoiding uneven deformation or damage to the wedge block during the stress process. This further improves the stability and service life of the mold. At the same time, the hinged design between the connecting rod, connecting block, and hydraulic rod enhances the floating nature of the mold during installation and disassembly, better adapting to minor deformations or errors within the mold mounting holes, thereby ensuring the installation accuracy and stability of the mold. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of an asymmetric bearing ring cold extrusion forming die according to the present invention;

[0029] Figure 2 for Figure 1 Full sectional view at point AA;

[0030] Figure 3 for Figure 2 A magnified view of a portion of point B in the middle;

[0031] Figure 4 This is an isometric view of the lower die assembly in an asymmetric bearing ring cold extrusion forming die of the present invention;

[0032] Figure 5 for Figure 4Full section view at C-C;

[0033] Figure 6 Asymmetric bearing ring cold extrusion forming die of the present application is in the state diagram when the lower die body is disassembled;

[0034] Figure 7 Asymmetric bearing ring cold extrusion forming die of the present application is in the state diagram when the lower die body is disassembled; Figure 6 Partial enlarged view at D.

[0035] In the figure: 1, die holder; 101, die mounting table; 102, die mounting hole; 103, screw mounting hole; 104, bolt mounting table; 105, bolt mounting hole; 106, hydraulic cavity; 107, communication groove; 108, piston hole; 109, axial positioning table; 110, support cone surface; 111, mounting groove; 2, lower die body; 201, positioning cone surface; 3, upper die body; 4, wedge block; 401, inner cone surface; 402, outer cone surface; 403, connecting block mounting groove; 404, connecting bolt mounting hole; 405, guide groove; 5, round head screw; 501, threaded section; 502, optical axis section; 503, ball head; 6, adjusting bolt; 7, sealing plate; 8, connecting block; 9, connecting rod; 10, connecting bolt; 11, hydraulic rod. DETAILED DESCRIPTION

[0036] Please refer to Figures 1 to 7 The present application provides an asymmetric bearing ring cold extrusion forming die, and the technical scheme is as follows:

[0037] An asymmetric bearing ring cold extrusion forming die, please refer to Figures 1 to 3 , comprising a die holder 1, an upper die body 3 and a lower die body 2, the middle part of the upper end face of the die holder 1 is provided with a die mounting table 101, a die mounting hole 102 is coaxially arranged in the die mounting table 101, the number of the die holder 1 is 2, and the two die holders 1 are arranged oppositely; the upper die body 3 is coaxially installed in the die mounting hole 102 of the upper die holder 1, the lower die body 2 is coaxially installed in the die mounting hole 102 of the lower die holder 1, the outer side wall of the upper die body 3 and the lower die body 2 is provided with a positioning cone surface 201, six wedge blocks 4 are slidably installed in the die mounting hole 102, the six wedge blocks 4 are arranged in the circumferential direction of the die mounting hole 102, the inner side wall of the six wedge blocks 4 is provided with an inner cone surface 401, the small end of the inner cone surface 401 is on the upper side, the taper of the inner cone surface 401 is the same as that of the positioning cone surface 201, and the inner cone surface 401 is slidably connected with the positioning cone surface 201; the outer side wall of the six wedge blocks 4 is slidably connected with the inner side wall of the die mounting hole 102, and the lower end face of the six wedge blocks 4 is hingedly installed with a driving assembly.

[0038] Please refer to Figures 3 to 5, the driving assembly includes hydraulic rod 11, the lower end surface of the mold base 1 is provided with a hydraulic groove, the lower end surface of the mold base 1 is fixedly connected with the cover plate 7 through the bolt, the upper end surface of the cover plate 7 and the inner side wall of the hydraulic groove form a hydraulic cavity 106, the hydraulic cavity 106 is communicated with the hydraulic power element through the hydraulic pipe, the hydraulic power element includes an adjusting bolt 6, the upper end surface of the mold base 1 is provided with a bolt mounting table 104, the bolt mounting hole 105 is coaxially installed on the bolt mounting table 104, the adjusting bolt 6 is threadedly connected in the bolt mounting hole 105, the upper end of the adjusting bolt 6 extends to the upper side of the bolt mounting table 104, the lower end of the mold base 1 is provided with a communication groove 107, the bolt mounting hole 105 and the hydraulic cavity 106 are communicated through the communication groove 107, the bottom wall of the mold mounting hole 102 is provided with the same number of piston holes 108 as the wedge-shaped blocks 4, the hydraulic rod 11 is coaxially and slidingly installed in the piston hole 108, the lower end surface of the wedge-shaped block 4 is provided with a connecting block mounting groove 403, the connecting block 8 is fixedly installed in the connecting block mounting groove 403, the upper end of the hydraulic rod 11 extends into the mold mounting hole 102, and the upper end of the hydraulic rod 11 is hingedly connected with the lower end of the connecting block 8.

[0039] Further, please refer to Figure 7 , the inner side wall of the mold mounting hole 102 is provided with a support taper surface 110, the outer side wall of the six wedge-shaped blocks 4 is provided with an outer taper surface 402, the lower end of the outer taper surface 402 is on the lower side, the taper of the outer taper surface 402 is the same as that of the support taper surface 110, and the outer taper surface 402 is slidingly connected with the support taper surface 110, the taper of the inner taper surface 401 is smaller than that of the outer taper surface 402; please refer to Figure 4 and Figure 7 , a plurality of screw mounting holes 103 are formed in the outer side wall of the mold mounting table 101, the number of the plurality of screw mounting holes 103 is the same as that of the wedge-shaped blocks 4, a plurality of round head screws 5 are coaxially and screw-connected in the plurality of screw mounting holes 103, the round head screw 5 includes a threaded section 501, an optical axis section 502 and a ball head 503, the threaded section 501 is screw-connected with the screw mounting hole 103, the optical axis section 502 is arranged between the threaded section 501 and the ball head 503, the ball head 503 extends into the mold mounting hole 102, a guide groove 405 is formed in the outer taper surface 402, the guide groove 405 is parallel to the generatrix of the outer taper surface 402, the ball head 503 is slidingly connected in the guide groove 405, and the ball head 503 is gap-fitted with the guide groove 405;

[0040] Further, please refer to Figure 7A connecting block 8 is arranged between the hydraulic rod 11 and the wedge-shaped block 4, and a connecting rod 9 is arranged between the connecting block 8 and the hydraulic rod 11, the upper end of the connecting rod 9 is hingedly connected with the lower end of the connecting block 8 through a pin, and the lower end of the connecting rod 9 is hingedly connected with the upper end of the hydraulic rod 11 through a pin, a connecting bolt mounting hole 404 is arranged on the upper end face of the wedge-shaped block 4, the lower end of the connecting bolt mounting hole 404 penetrates the connecting block mounting groove 403, a threaded hole coaxial with the connecting bolt mounting hole 404 is arranged on the upper end face of the connecting block 8, a connecting bolt 10 is threadedly connected in the connecting bolt mounting hole 404, the lower side of the connecting bolt 10 is threadedly connected with the threaded hole on the connecting block 8, and the bottom wall of the mold mounting hole 102 is provided with an axial positioning seat, an installation groove 111 is arranged between the inner side wall of the mold mounting hole 102 and the axial positioning seat, and the vertical projections of the plurality of piston holes 108 are all located in the installation groove 111.

[0041] Please refer to Figures 1 to 7The specific working principle of the asymmetric bearing ring cold extrusion forming die is as follows: when the cold extrusion forming die is installed, first, the connecting rod 9 is hingedly installed with the hydraulic rod 11 through a pin, and then the connecting rod 9 is hingedly installed with the connecting block 8 through a pin; after the above installation is completed, the round head screw 5 is screwed into the screw mounting hole 103, the ball head 503 on the round head screw 5 is screwed into the die mounting hole 102, the wedge block 4 is inserted into the die mounting hole 102, in the insertion process, the guide groove 405 is aligned with the ball head 503, and the ball head 503 is slidingly installed in the guide groove 405, after the wedge block 4 is inserted into the die mounting hole 102, the connecting block mounting groove 403 is aligned with the connecting block 8, and the connecting block 8 is inserted into the connecting block mounting groove 403 at the lower end of the wedge block 4, after the connecting block 8 is inserted into the connecting block mounting groove 403, the connecting bolt 10 is inserted into the connecting bolt mounting hole 404, and the connecting bolt 10 is screwed downward, so that the lower side thread of the connecting bolt 10 is screwed with the threaded hole on the connecting block 8, thereby mechanically connecting the wedge block 4, the connecting block 8 and the hydraulic rod 11; the adjusting bolt 6 is screwed into the bolt mounting hole 105 along the direction of S1, the volume of the hydraulic oil in the hydraulic cavity 106 increases, the pressure increases, the hydraulic rod 11 is pushed to move upward, and then the wedge block 4 is driven to move upward, the outer conical surface 402 and the supporting conical surface 110 slide relative to each other, the inner diameter between the plurality of wedge blocks 4 increases, the lower mold body 2 is placed into the die mounting hole 102, and the lower end surface of the lower mold body 2 is attached to the upper end surface of the axial positioning table 109; the adjusting bolt 6 is unscrewed from the bolt mounting hole 105 along the opposite direction of S1, the hydraulic oil containing space in the bolt mounting hole 105 increases, due to the communication effect of the communication groove 107, the hydraulic oil in the hydraulic cavity 106 flows into the bolt mounting hole 105, so that the volume of the hydraulic oil in the hydraulic cavity 106 decreases, the pressure decreases, and the hydraulic rod 11 moves downward under the action of negative pressure until the inner conical surface 401 of the wedge block 4 is attached to the positioning conical surface 201 of the lower mold body 2, as the wedge block 4 continues to move downward, the inner conical surface 401 of the plurality of wedge blocks 4 and the positioning conical surface 201 slide relative to each other, the inner conical surface 401 generates an extrusion force to the positioning conical surface 201 in the direction of the center of the die mounting hole 102, so that the lower mold body 2 is fixed in the die mounting hole 102 and the positioning is completed, the installation of the upper mold body 3 is the same as that of the lower mold body 2, and details are not repeated here. When the cold extrusion forming die is disassembled, the adjusting bolt 6 is continuously screwed into the bolt mounting hole 105 along the direction of S1, the hydraulic oil in the hydraulic cavity 106 is continuously extruded, the hydraulic rod 11 is continuously pushed to move upward, and then the wedge block 4 is continuously driven to move upward, the outer conical surface 402 and the supporting conical surface 110 continue to slide relative to each other, the inner diameter between the plurality of wedge blocks 4 continues to increase, until the inner conical surface 401 is completely separated from the positioning conical surface 201 of the lower mold body 2, at this time, the lower mold body 2 can be taken out from the die mounting hole 102.In the same way, by adjusting the bolt 6 to control the movement of the hydraulic rod 11, the upper die body 3 can be disassembled.

[0042] The above detailed description of one embodiment of the present application is made in conjunction with the accompanying drawings, but the present application is not limited to the above described embodiment. For those skilled in the art, various changes, modifications, replacements and variations of the embodiments can be made without departing from the principles and ideas of the present application, and should still fall within the protection scope of the present application.

Claims

1. A cold extrusion forming die for asymmetric bearing rings, comprising a die base (1), an upper die body (3), and a lower die body (2), characterized in that, A mold mounting platform (101) is provided in the middle of the upper end face of the mold base (1). A mold mounting hole (102) is coaxially opened in the mold mounting platform (101). There are two mold bases (1), which are arranged vertically opposite each other. The upper mold body (3) is coaxially installed in the mold mounting hole (102) of the upper mold base (1), and the lower mold body (2) is coaxially installed in the mold mounting hole (102) of the lower mold base (1). The outer walls of the upper mold body (3) and the lower mold body (2) are provided with positioning cone surfaces (201). Multiple wedge blocks (4) are slidably installed in the mold mounting hole (102). The wedge blocks (4) are evenly distributed in a circumferential array along the axial direction of the mold mounting hole (102). Each of the wedge blocks (4) has an inner conical surface (401) on its inner sidewall. The small end of the inner conical surface (401) is on the upper side. The inner conical surface (401) has the same taper as the positioning conical surface (201). The inner conical surface (401) and the positioning conical surface (201) are slidably connected. The outer sidewalls of the wedge blocks (4) are slidably connected to the inner sidewall of the mold mounting hole (102). A drive assembly is hinged to the lower end face of each of the wedge blocks (4). The drive assembly is designed to provide a downward pulling force to the wedge blocks (4).

2. The asymmetric bearing ring cold extrusion forming die according to claim 1, characterized in that, The drive assembly includes a hydraulic rod (11), a hydraulic groove is provided on the lower end face of the mold base (1), a sealing plate (7) is fixedly connected to the lower end face of the mold base (1) by bolts, a hydraulic cavity (106) is formed between the upper end face of the sealing plate (7) and the inner side wall of the hydraulic groove, the hydraulic cavity (106) is connected to the hydraulic power element through a hydraulic pipe, the bottom wall of the mold mounting hole (102) is provided with piston holes (108) of the same number as the wedge block (4), the hydraulic rod (11) is coaxially slidably installed in the piston hole (108), the lower end face of the wedge block (4) is provided with a connecting block mounting groove (403), a connecting block (8) is fixedly installed in the connecting block mounting groove (403), the upper end of the hydraulic rod (11) extends into the mold mounting hole (102), and the upper end of the hydraulic rod (11) is hinged to the lower end of the connecting block (8).

3. The asymmetric bearing ring cold extrusion forming die according to claim 2, characterized in that, The hydraulic power component includes an adjusting bolt (6). A bolt mounting platform (104) is provided on the upper surface of the mold base (1). A bolt mounting hole (105) is coaxially mounted on the bolt mounting platform (104). The adjusting bolt (6) is threaded into the bolt mounting hole (105). The upper end of the adjusting bolt (6) extends to the upper side of the bolt mounting platform (104). A connecting groove (107) is provided at the lower end of the mold base (1). The bolt mounting hole (105) and the hydraulic chamber (106) are connected through the connecting groove (107).

4. The asymmetric bearing ring cold extrusion forming die according to claim 2, characterized in that, The upper side of the inner wall of the mold mounting hole (102) is provided with a supporting cone surface (110), and the outer walls of the multiple wedge blocks (4) are provided with an outer cone surface (402). The lower end of the outer cone surface (402) is on the lower side. The outer cone surface (402) and the supporting cone surface (110) have the same taper, and the outer cone surface (402) and the supporting cone surface (110) are slidably connected. The taper of the inner cone surface (401) is smaller than the taper of the outer cone surface (402).

5. The asymmetric bearing ring cold extrusion forming die according to claim 4, characterized in that, The outer wall of the mold mounting platform (101) is provided with a plurality of screw mounting holes (103), the number of which is the same as the number of wedge blocks (4). A round head screw (5) is coaxially bolted into each of the plurality of screw mounting holes (103). The round head screw (5) includes a threaded section (501), a smooth shaft section (502), and a ball head (503). The threaded section (501) is threadedly connected to the screw mounting hole (103). The optical axis segment (502) is located between the threaded segment (501) and the ball head (503). The ball head (503) extends into the mold mounting hole (102). A guide groove (405) is provided on the outer conical surface (402). The opening direction of the guide groove (405) is parallel to the generatrix of the outer conical surface (402). The ball head (503) is slidably connected in the guide groove (405), and the ball head (503) and the guide groove (405) are in clearance fit.

6. The asymmetric bearing ring cold extrusion forming die according to claim 5, characterized in that, A connecting rod (9) is provided between the connecting block (8) and the hydraulic rod (11). The upper end of the connecting rod (9) is hinged to the lower end of the connecting block (8) by a pin, and the lower end of the connecting rod (9) is hinged to the upper end of the hydraulic rod (11) by a pin.

7. The asymmetric bearing ring cold extrusion forming die according to claim 6, characterized in that, The upper end face of the wedge block (4) is provided with a connecting bolt mounting hole (404), the lower end of the connecting bolt mounting hole (404) passes through the connecting block mounting groove (403), the upper end face of the connecting block (8) is provided with a threaded hole coaxial with the connecting bolt mounting hole (404), the connecting bolt mounting hole (404) is internally threaded with a connecting bolt (10), and the lower thread of the connecting bolt (10) is threadedly connected to the threaded hole on the connecting block (8).

8. The asymmetric bearing ring cold extrusion forming die according to claim 6, characterized in that, The bottom wall of the mold mounting hole (102) is provided with an axial positioning seat, and an installation groove (111) is provided between the inner side wall of the mold mounting hole (102) and the axial positioning seat. The vertical projections of the multiple piston holes (108) are all located in the installation groove (111).

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