Cold extrusion forming die for asymmetric bearing ring

Abstract

The invention relates to the technical field of bearing ring cold extrusion forming, in particular to an asymmetric bearing ring cold extrusion forming die which comprises a die holder, an upper die body and a lower die body, a die mounting table is arranged in the middle of the upper end face of the die holder, and a die mounting hole is coaxially formed in the die mounting table; the die mounting hole is formed in the die holder, the wedge-shaped block is arranged in the die mounting hole, and the radial extrusion force of the wedge-shaped block on the upper die body and the lower die body is changed through axial movement of the wedge-shaped block, so that the die is quickly mounted, fixed and conveniently dismounted, and the dismounting and mounting efficiency of the die is improved; the die base and the upper die body are designed to be of a split structure, the die base and the lower die body are designed to be of a split structure, the weight needed to be loaded in the die dismounting process is effectively reduced, and the dismounting efficiency of the cold extrusion forming die is further improved.

Description

Technical Field

[0001] This invention relates to the field of cold extrusion forming technology for bearing rings, specifically to a cold extrusion forming die for asymmetric bearing rings. Background Technology

[0002] Cold extrusion forming has become the mainstream process for mass production of bearing outer rings due to its significant advantages such as high material utilization, excellent mechanical properties, and high production efficiency. The outer rings of tapered roller bearings have an asymmetrical structure, and machining them by cutting would result in low material utilization and increased production costs. Therefore, cold extrusion forming is particularly suitable for the production of tapered roller bearing outer rings to meet the precision requirements, cost control requirements, and high-efficiency mass production of these outer rings.

[0003] To control equipment investment costs, bearing manufacturers typically need to adapt a single cold extrusion production line to produce various sizes of tapered roller bearing outer rings. Since the dimensions of these outer rings differ, different sizes of cold extrusion dies must be used during production. Existing cold extrusion dies usually use bolts to fasten the components. While this design meets the requirements for die fastening, positioning, and operational stability, it results in lengthy disassembly and assembly times. Furthermore, each die set requires calibration and adjustment after installation to ensure the fit between the upper and lower dies. The significant weight of each die set also makes replacement and adjustment difficult during operation, thus impacting production efficiency.

[0004] Therefore, how to reduce disassembly time and overall weight while ensuring a stable mold connection has become an urgent problem to be solved in the field of cold extrusion forming mold design. Summary of the Invention

[0005] The purpose of this invention is to provide a cold extrusion forming die for asymmetric bearing rings, so as to solve the problems of low disassembly efficiency and heavy weight of existing cold extrusion forming dies for asymmetric bearing rings, which are inconvenient for post-installation debugging and calibration, resulting in low production efficiency of bearing rings.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A cold extrusion forming die for an asymmetric bearing ring includes a die base, an upper die body, and a lower die body. A die mounting platform is provided at the center of the upper end face of the die base. A die mounting hole is coaxially formed within the die mounting platform. Two die bases are arranged vertically opposite each other. The upper die body is coaxially mounted within the die mounting hole of the upper die base, and the lower die body is coaxially mounted within the die mounting hole of the lower die base. Positioning cone surfaces are provided on the outer side walls of both the upper and lower die bodies. The die bodies slide within the die mounting holes. Multiple wedges are installed, and the multiple wedges are evenly distributed in a circumferential array along the axial direction of the mold mounting hole. Each of the multiple wedges has an inner conical surface on its inner sidewall, with the small end of the inner conical surface 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 to the positioning conical surface. The outer sidewalls of the multiple wedges are slidably connected to the inner sidewall of the mold mounting hole. A drive assembly is hinged to the lower end face of each of the multiple wedges. The drive assembly is designed to provide a downward pulling force to the multiple wedges.

[0007] When the drive assembly is activated, it provides a downward pulling force to multiple wedge blocks. Due to the sliding connection between the inner conical surface and the positioning conical surface, as the wedge blocks move downwards, relative sliding occurs between the inner conical surfaces and the positioning conical surfaces. The inner conical surface exerts a pressing force on the positioning conical surface towards the center of the mold mounting hole, thus fixing the upper and lower mold bodies within the mold mounting hole, achieving rapid mold installation and fixation. When mold disassembly is required, simply turn off the drive assembly, release the pressing force of the wedge blocks on the positioning conical surface, and rotate the wedge blocks along the hinge point between the wedge blocks and the drive assembly to unfold the multiple wedge blocks, allowing the upper or lower mold body to be removed from the mold mounting hole. This significantly shortens disassembly time and makes post-installation debugging and calibration more convenient, improving the production efficiency of cold extrusion forming molds. Furthermore, designing the mold base and upper mold body, and the mold base and lower mold body as separate structures, only requires disassembling the upper or lower mold body during disassembly, effectively reducing the weight required for mold disassembly and further improving the assembly and disassembly efficiency of cold extrusion forming molds. Furthermore, through the setting of the wedge blocks, after the cold extrusion forming die is installed, the outer wall of the wedge block fits against the inner wall of the die mounting hole, and the inner conical surface on the inner wall of the wedge block fits against the positioning conical surface. During the cold extrusion forming process, the radial extrusion force on the upper die body or the lower die body acts on the wedge block, and is then transmitted to the die mounting table by the wedge block. Multiple wedge blocks form a complete circle, which evenly disperses the radial extrusion force, ensuring the radial dimensional stability of the upper die body and the lower die body after the radial dimension is reduced, thereby ensuring the stability and service life of the cold extrusion forming die.

[0008] Preferably, the driving assembly includes a hydraulic rod, a hydraulic groove is provided on the lower end face of the mold base, a sealing plate is fixedly connected to the lower end face of the mold base by bolts, a hydraulic cavity is formed between the upper end face of the sealing plate and the inner sidewall of the hydraulic groove, the hydraulic cavity is connected to the hydraulic power element through a hydraulic pipe, a piston hole with the same number of piston holes as the wedge blocks is provided on the bottom wall of the mold mounting hole, the hydraulic rod is coaxially slidably installed in the piston hole, a connecting block mounting groove is opened on the lower end face of the wedge block, a connecting block is fixedly installed in the connecting block mounting groove, the upper end of the hydraulic rod extends into the mold mounting hole, and the upper end of the hydraulic rod is hinged to the lower end of the connecting block.

[0009] The hydraulic power unit is activated, drawing hydraulic oil from the hydraulic chamber to create a negative pressure. Under this negative pressure, the hydraulic rod moves downwards, causing the wedge block to move downwards, thus quickly securing the upper and lower mold bodies. When it is necessary to release the fixation, the hydraulic power unit reverses its operation, injecting hydraulic oil into the hydraulic chamber. This causes the hydraulic rod to move upwards under the pressure of the hydraulic oil, which in turn moves the wedge block upwards, releasing the fixation of the upper and lower mold bodies. This design not only simplifies the mold assembly and disassembly process and improves efficiency, but also ensures the stability and service life of the mold.

[0010] Preferably, the hydraulic power component includes an adjusting bolt, a bolt mounting platform is provided on the upper end surface of the mold base, a bolt mounting hole is coaxially mounted on the bolt mounting platform, the adjusting bolt is threaded into the bolt mounting hole, the upper end of the adjusting bolt extends to the upper side of the bolt mounting platform, a connecting groove is provided at the lower end of the mold base, and the bolt mounting hole is connected to the hydraulic cavity through the connecting groove.

[0011] When the adjusting bolt is screwed upwards, the hydraulic oil capacity in the bolt mounting hole increases. Due to the connecting groove, the hydraulic oil in the hydraulic chamber flows into the bolt mounting hole, reducing the volume and pressure of the hydraulic oil in the hydraulic chamber. This negative pressure causes the hydraulic rod to move downwards, quickly fixing the upper and lower mold bodies. When it is necessary to release the fixation, the adjusting bolt is screwed downwards, reducing the hydraulic oil capacity in the bolt mounting hole. This forces some of the hydraulic oil in the hydraulic chamber into the bolt mounting hole, increasing the volume and pressure of the hydraulic oil in the hydraulic chamber, pushing the hydraulic rod upwards, and subsequently moving the wedge block upwards, releasing the fixation of the upper and lower mold bodies. This design makes the fixing and releasing of the mold more convenient, further improving the efficiency of mold assembly and disassembly. Furthermore, using the adjusting bolt as a hydraulic power element not only reduces the manufacturing cost of the equipment but also avoids the safety hazards that may arise from using electrically driven components, improving the safety performance of the equipment. At the same time, the operation of the adjusting bolt is simple and convenient, requiring no complex electrical control system, making the fixing and releasing process of the mold more intuitive and easy to understand, facilitating the operator's mastery and use. In addition, the adjusting bolts have high reliability and durability, and can adapt to the needs of long-term and high-frequency use, ensuring the stable operation and long service life of the cold extrusion forming die.

[0012] Preferably, the upper side of the inner wall of the mold mounting hole is provided with a supporting conical surface, and the outer walls of the plurality of wedge blocks are provided with an outer conical surface. The lower end of the outer conical surface is on the lower side, the outer conical surface and the supporting conical surface have the same taper, and the outer conical surface and the supporting conical surface are slidably connected. The taper of the inner conical surface is smaller than the taper of the outer conical surface.

[0013] The sliding connection design between the outer conical surface and the supporting conical surface not only enhances the stability of the wedge block within the mold mounting hole but also effectively prevents the wedge block from shifting or wobbling during stress, further ensuring the stability and service life of the mold. Simultaneously, the smaller taper of the inner conical surface compared to the outer conical surface causes the compressive force between the inner and positioning conical surfaces to gradually increase as the wedge block moves downwards, resulting in a tighter fixation of the upper and lower mold bodies. This design not only improves the mold's fixation effect but also facilitates post-installation debugging and calibration, further enhancing the production efficiency of cold extrusion forming molds. Furthermore, the supporting conical surface, after the cold extrusion forming mold is installed, ensures that the outer conical surface on the outer wall of the wedge block fits against the supporting conical surface, forming an additional support structure. During the cold extrusion forming of the outer ring of a tapered roller bearing, if the upper or lower mold body is subjected to abnormal radial compressive force, this additional support structure can effectively disperse and alleviate this compressive force, further ensuring the stability and safety of the mold.

[0014] Preferably, the outer wall of the mold mounting platform is provided with a plurality of screw mounting holes, the number of which is the same as the number of wedge blocks. A round-headed screw is coaxially bolted into each of the plurality of screw mounting holes. The round-headed screw includes a threaded section, a smooth axis section, and a ball head. The threaded section is threadedly connected to the screw mounting hole. The smooth axis section is located between the threaded section and the ball head. The ball head extends into the mold mounting hole. A guide groove is provided on the outer conical surface. The opening direction of the guide groove is parallel to the generatrix of the outer conical surface. The ball head is slidably connected in the guide groove, and there is a clearance fit between the ball head and the guide groove.

[0015] When the wedge block is pulled downward by the hydraulic rod, it moves downward and slides into the guide groove via the ball head. The ball head provides a limiting effect on the wedge block, and the outer conical surface remains in contact with the supporting conical surface, thus preventing the wedge block from deflecting or tilting during the force application process. This further enhances the stability and guidance of the wedge block within the mold mounting hole. Furthermore, the clearance fit design between the ball head and the guide groove allows the wedge block to have a certain degree of floating capability during its downward movement, better adapting to minor deformations or errors within the mold mounting hole, further improving the installation accuracy and stability of the mold. When the wedge block is pushed upward by the hydraulic rod, it moves upward. Through the sliding of the ball head within the guide groove, the wedge block can unfold smoothly and easily, facilitating the removal of the upper and lower mold bodies from the mold mounting hole. This not only improves the convenience of mold disassembly but also ensures the integrity and safety of the mold during disassembly, preventing damage or deformation caused by improper disassembly. Meanwhile, the design of the ball head and guide groove enhances the guiding nature of the mold during installation and disassembly, making the installation and disassembly process more accurate and efficient.

[0016] Preferably, a connecting rod is provided between the connecting block and the hydraulic rod, the upper end of the connecting rod is hinged to the lower end of the connecting block by a pin, and the lower end of the connecting rod is hinged to the upper end of the hydraulic rod by a pin.

[0017] The connecting rod design allows the hydraulic rod to transmit force more smoothly and evenly when pushing or pulling the wedge block, preventing uneven deformation or damage to the wedge block during stress, thus further improving the stability and service life of the mold. Simultaneously, the hinged design between the connecting rod, connecting block, and hydraulic rod gives the wedge block a certain degree of floating and self-adaptive capability during its up-and-down movement, better adapting to minor deformations or errors within the mold mounting holes, thereby ensuring the mold's installation accuracy and stability.

[0018] Preferably, the upper end face of the wedge block is provided with a connecting bolt mounting hole, the lower end of the connecting bolt mounting hole passes through the connecting block mounting groove, the upper end face of the connecting block is provided with a threaded hole coaxial with the connecting bolt mounting hole, the connecting bolt is threadedly connected to the connecting bolt mounting hole, and the lower thread of the connecting bolt is threadedly connected to the threaded hole on the connecting block.

[0019] When installing the wedge block, first hinge the connecting rod and hydraulic rod together using pins, then hinge the connecting rod and connecting block together using pins. After completing the above installation, insert the wedge block into the mold mounting hole, and insert the connecting block into the connecting block mounting groove at the lower end of the wedge block. After the connecting block is inserted into the connecting block mounting groove, insert the connecting bolt into the connecting bolt mounting hole and screw the connecting bolt downwards so that the lower thread of the connecting bolt is threaded into the threaded hole on the connecting block, thereby mechanically connecting the wedge block, connecting block, and hydraulic rod. This connection method not only facilitates the disassembly and replacement of the wedge block, but also ensures a firm connection, guaranteeing the stability and long service life of the mold during cold extrusion forming. Simultaneously, the screwing depth of the connecting bolt can be adjusted by using shims of different thicknesses between the connecting bolt and the wedge block, thereby achieving fine-tuning of the wedge block position and ensuring a tight fit between the inner conical surface and the positioning conical surface of the wedge block, further improving the installation accuracy and stability of the mold. In addition, the connecting bolts facilitate the pre-tightening of the wedge blocks. By tightening the connecting bolts, a certain pre-tightening force can be applied to the wedge blocks in advance, making the wedge blocks more stable in the mold mounting holes and avoiding loosening or damage caused by vibration or impact during mold use.

[0020] Preferably, the bottom wall of the mold mounting hole is provided with an axial positioning seat, and an mounting groove is provided between the inner side wall of the mold mounting hole and the axial positioning seat, and the vertical projections of the plurality of piston holes are all located in the mounting groove.

[0021] The axial positioning seat is used to axially position the hydraulic rod, preventing axial movement within the mold mounting hole and ensuring stability and accuracy when the hydraulic rod pushes or pulls the wedge block. Simultaneously, a mounting groove is provided between the inner wall of the mold mounting hole and the axial positioning seat. This groove provides installation space for the connection between the hydraulic rod, connecting rod, and connecting block, facilitating maintenance and replacement. Operators only need to wipe the upper or lower mold body to inspect and replace the connection structure within the mounting groove, thus improving the maintainability and flexibility of the mold and enhancing the maintenance efficiency of cold extrusion forming dies.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows: 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.

[0023] 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.

[0024] 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.

[0025] 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

[0026] 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; Figure 2 for Figure 1 Full sectional view at point AA; Figure 3 for Figure 2 A magnified view of a portion of point B in the middle; 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; Figure 5 for Figure 4 Full sectional view at point CC; Figure 6This is a diagram showing the state of an asymmetric bearing ring cold extrusion forming die during the disassembly of the lower die body. Figure 7 for Figure 6 A magnified view of a section at point D.

[0027] In the diagram: 1. Mold base; 101. Mold mounting platform; 102. Mold mounting hole; 103. Screw mounting hole; 104. Bolt mounting platform; 105. Bolt mounting hole; 106. Hydraulic chamber; 107. Connecting groove; 108. Piston hole; 109. Axial positioning platform; 110. Support cone surface; 111. Mounting groove; 2. Lower mold body; 201. Positioning cone surface; 3. Upper mold 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 shaft section; 503. Ball head; 6. Adjusting bolt; 7. Sealing plate; 8. Connecting block; 9. Connecting rod; 10. Connecting bolt; 11. Hydraulic rod. Detailed Implementation

[0028] Please see Figures 1 to 7 This invention provides a cold extrusion forming die for asymmetric bearing rings, the technical solution of which is as follows: Please refer to an asymmetric bearing ring cold extrusion forming die. Figures 1 to 3 The system includes a mold base 1, an upper mold body 3, and a lower mold body 2. A mold mounting platform 101 is located in the middle of the upper surface of the mold base 1. A mold mounting hole 102 is coaxially formed within the mold mounting platform 101. There are two mold bases 1, arranged vertically opposite each other. The upper mold body 3 is coaxially mounted within the mold mounting hole 102 of the upper mold base 1, and the lower mold body 2 is coaxially mounted within the mold mounting hole 102 of the lower mold base 1. Positioning cone surfaces 201 are provided on the outer walls of both the upper mold body 3 and the lower mold body 2. Six wedge blocks 4 are slidably installed in the mounting hole 102. The six wedge blocks 4 are evenly distributed in a circumferential array along the axial direction of the mounting hole 102. Each of the six 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 and is slidably connected to the positioning conical surface 201. The outer sidewalls of the six wedge blocks 4 are slidably connected to the inner sidewall of the mounting hole 102. A drive assembly is hinged to the lower end face of each of the six wedge blocks 4.

[0029] Please see Figures 3 to 5The 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 wall of the hydraulic groove. The hydraulic cavity 106 is connected to a hydraulic power element via a hydraulic pipe. The hydraulic power element includes an adjusting bolt 6. A bolt mounting platform 104 is provided on the upper end face 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, and the upper end of the adjusting bolt 6 extends to the bolt mounting hole 105. On the upper side of the mounting platform 104, the lower end of the mold base 1 is provided with a connecting groove 107. The bolt mounting hole 105 and the hydraulic cavity 106 are connected through the connecting groove 107. The bottom wall of the mold mounting hole 102 is provided with piston holes 108 in the same number as the wedge block 4. The hydraulic rod 11 is coaxially and 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.

[0030] For further details, please refer to Figure 7 The upper side of the inner wall of the mold mounting hole 102 is provided with a supporting conical surface 110, and the outer walls of the six wedge blocks 4 are all provided with outer conical surfaces 402. The lower end of the outer conical surface 402 is on the lower side, and the outer conical surface 402 and the supporting conical surface 110 have the same taper. The outer conical surface 402 and the supporting conical surface 110 are slidably connected. The taper of the inner conical surface 401 is smaller than the taper of the outer conical surface 402. Please refer to [link / reference]. Figure 4 and Figure 7 Multiple screw mounting holes 103 are provided on the outer side wall of the mold mounting table 101. The number of screw mounting holes 103 is the same as the number of wedge blocks 4. A round head screw 5 is coaxially bolted into each of the multiple screw mounting holes 103. The round head screw 5 includes a threaded section 501, a smooth axis section 502 and a ball head 503. The threaded section 501 is threadedly connected to the screw mounting hole 103. The smooth axis section 502 is located 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 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 there is a clearance fit between the ball head 503 and the guide groove 405. For further details, please refer to Figure 7A 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. A connecting bolt mounting hole 404 is provided on the upper end surface of the wedge block 4. The lower end of the connecting bolt mounting hole 404 passes through the connecting block mounting groove 403. A threaded hole coaxial with the connecting bolt mounting hole 404 is provided on the upper end surface of the connecting block 8. A connecting bolt 10 is connected to the internal thread of the connecting bolt mounting hole 404. The lower thread of the connecting bolt 10 is threaded to the threaded hole on the connecting block 8. An axial positioning seat is provided on the bottom wall of the mold mounting hole 102. An mounting 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 mounting groove 111.

[0031] Please see Figures 1 to 7The specific working principle of the asymmetric bearing ring cold extrusion forming die provided by the present invention is as follows: When installing the cold extrusion forming die, firstly, the connecting rod 9 and the hydraulic rod 11 are hinged together by means of a pin, and then the connecting rod 9 and the connecting block 8 are hinged together by means of a pin. After completing the above installation, the round head screw 5 is screwed into the screw mounting hole 103, and 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. During the insertion process, the guide groove 405 is aligned with the ball head 503, and the ball head 503 is slidably installed in the guide groove 405. After the wedge block 4 is inserted into the mold 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 downwards so that the lower thread of the connecting bolt 10 is threadedly connected to 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, and the hydraulic pressure in the hydraulic chamber 106 is released. As the oil volume increases, the pressure increases, pushing the hydraulic rod 11 upward, which in turn drives the wedge block 4 upward. The outer cone surface 402 slides relative to the supporting cone surface 110, increasing the inner diameter between the multiple wedge blocks 4. This allows the lower mold body 2 to be placed into the mold mounting hole 102, and the lower end face of the lower mold body 2 to be aligned with the upper end face of the axial positioning table 109. The adjusting bolt 6 is then unscrewed from the bolt mounting hole 105 in the opposite direction of S1, increasing the hydraulic oil capacity within the bolt mounting hole 105. Due to the connecting effect of the connecting groove 107, the hydraulic oil in the hydraulic chamber 106 flows into the bolt mounting hole 105. The volume of hydraulic oil in the hydraulic chamber 106 is reduced, and the pressure is lowered. Under negative pressure, the hydraulic rod 11 moves downward until the inner conical surface 401 is in contact with 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 multiple wedge blocks 4 slides relative to the positioning conical surface 201. The inner conical surface 401 exerts a squeezing force on the positioning conical surface 201 in the direction of the center of the mold mounting hole 102, so that the lower mold body 2 is fixed in the mold mounting hole 102 and the positioning is completed. The installation steps of the upper mold body 3 are the same as those of the lower mold body 2, and will not be described again here. When disassembling the cold extrusion forming die, the adjusting bolt 6 is screwed into the bolt mounting hole 105 along the direction of S1. The hydraulic oil in the hydraulic chamber 106 continues to be squeezed out, pushing the hydraulic rod 11 to continue moving upward, which in turn drives the wedge block 4 to continue moving upward. The outer cone surface 402 and the supporting cone surface 110 continue to slide relative to each other, and the inner diameter between the multiple wedge blocks 4 continues to increase until the inner cone surface 401 is completely separated from the positioning cone surface 201 of the lower die body 2. At this time, the lower die body 2 can be removed from the die mounting hole 102.Similarly, by adjusting the bolt 6 to control the movement of the hydraulic rod 11, the upper mold body 3 can be disassembled.

[0032] The specific embodiment of the present invention has been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the embodiments described above. For those skilled in the art, various changes, modifications, substitutions, and variations made to these embodiments without departing from the principles and ideas of the present invention should still fall within the protection scope of the present invention.

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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