Improved bearing inner ring forging processing technology and processing equipment thereof

Abstract

The invention discloses an improved bearing inner ring forging machining process and machining equipment thereof, and relates to the technical field of part forging processes, the improved bearing inner ring forging machining process comprises the steps of blank preparation, upsetting, backward extrusion forming, punching, height leveling, chambering and finish machining; the material blank is upset, so that the middle section of the material blank is bulged outwards by a certain radian, and subsequent positioning and deformation of the material blank are facilitated; a material blank is subjected to backward extrusion machining through a specially-made punch and a specially-made die, the material blank is made to be in the initial shape close to a finished product, then the shape of the material blank is further refined through the punching and height leveling steps, the workload of follow-up turning machining is reduced, and finally a final forge piece is obtained through reaming and finish machining. By optimizing the machining process and cooperating with the specially-made punch and die design, the material utilization rate of the bearing inner ring can be remarkably increased, the time of subsequent machining procedures is shortened, and therefore the manufacturing period is shortened.

Description

Technical Field

[0001] The present application relates to the technical field of parts forging technology, and in particular to an improved bearing inner ring forging process and processing equipment thereof. Background Art

[0002] As a key component in the railway freight system, the manufacturing process of the inner ring of the bearing directly affects the performance and cost of the product. In recent years, with the rapid development of the railway freight industry, the demand for inner rings of bearings has continued to grow, and the quality requirements have become increasingly stringent. In order to meet the market's urgent demand for high-quality, low-cost, and short-delivery products, companies need to continuously optimize production processes and promote the development of manufacturing towards precision and efficiency.

[0003] like Figure 1 The existing bearing inner ring is made of G20CrNi2MoA, which has a certain taper on the working surface and two end faces, the inner hole of the large end face has a step, and the small end face has a thin wall thickness. Therefore, it is not easy to forge directly. The traditional processing technology of the bearing inner ring is usually to directly process it into a ring shape and then cut it. This processing technology has low processing efficiency and low utilization of raw materials, which greatly increases the product manufacturing cycle and production cost. Therefore, how to simplify the processing technology of the bearing inner ring and improve the processing efficiency and utilization of raw materials has become a technical problem that needs to be solved urgently in the current industry. Summary of the invention

[0004] In view of the problems existing in the prior art, the present application provides an improved bearing inner ring forging process and processing equipment thereof.

[0005] In the first aspect, the present application provides an improved bearing inner ring forging process, which adopts the following technical solution: An improved bearing inner ring forging process comprises the following steps: Step 1: Prepare the blank, select a cylindrical blank, and ensure that the shape and size of the blank meet the requirements; Step 2, roughening, heating the blank to the shaping temperature, and then roughening the blank so that the middle section of the blank bulges outwards to a certain arc; Step 3: reverse extrusion molding: reverse extrusion is performed on the roughened blank using a special die and punch. Through the constraints of the punch and the die, the side wall of the blank is L-shaped, a blind hole is formed in the middle of the blank, and a conical surface with a certain angle and depth is formed at the intersection of the blind hole and the top of the blank; Step 4: punching: punching the blank with a punch to punch through the blind hole on the blank; Step 5: After the punching of the blank is completed, the top of the blank and the conical surface are extruded to refine the shape of the top of the blank and the conical surface to meet the process requirements; Step 6, reaming: Place the blank in a reaming device, and use a mandrel to roll-expand the inner hole and conical surface of the blank so that the inner hole and conical surface of the blank meet the process requirements; Step 7, finish machining: Perform finish machining on the entire blank, and precisely control the shape and dimensions of each position of the blank to obtain the final forging.

[0006] In a second aspect, the present application provides an improved forging and processing device for a bearing inner ring, adopting the following technical solution: An improved forging and processing device for a bearing inner ring includes a lower template, an upper template, and a press. The press is used to drive the upper template to slide in the vertical direction. A heading station, a backward extrusion station, and a punching station are respectively arranged on the lower template. A lower heading table is arranged at the heading station, a forming die is arranged at the backward extrusion station, and a punching female die is installed at the punching station. An upper heading table, a forming punch, a piercing punch, and a flat-top unloading plate are respectively arranged on the upper template. The upper heading table corresponds to the lower heading table in position, the forming punch corresponds to the forming die in position, the piercing punch and the flat-top unloading plate both correspond to the punching female die in position. The flat-top unloading plate is horizontally arranged, and a convex platform is arranged at the bottom end of the flat-top unloading plate. The side wall of the convex platform has a certain taper.

[0007] Optionally, the forming die includes an outer die and an inner die. A bottom bearing platform is arranged on the lower template. An installation groove is opened at the top end of the bottom bearing platform. The outer die is adapted to the installation groove, and the outer die is placed in the installation groove. The inner die passes through the outer die and is adapted to the outer die. The inner diameter of the inner die gradually decreases along the direction close to the bottom bearing platform.

[0008] Optionally, a washer is further arranged in the outer die. The washer is arranged at the bottom of the inner die. A central hole is opened on the bottom bearing platform. The central hole is communicated with the installation groove. A bottom iron is placed in the central hole. The bottom iron passes through the washer and the inner die and is adapted to the inner die.

[0009] Optionally, a forming connection seat is fixedly arranged on the upper template. The forming punch is detachably arranged on the forming connection seat.

[0010] Optionally, the forming punch includes an installation section, a connection section, and a stamping section. The installation section is fixedly connected to the forming connection seat. The connection section is arranged between the installation section and the stamping section. A conical connection surface is arranged at the connection between the connection section and the stamping section for forming a conical surface on the blank. The diameter of the stamping section gradually decreases along the direction away from the connection section.

[0011] Optionally, a cap is provided on the molding connection seat for sliding sleeve, and the cap is provided with a crimping portion for abutting the bottom end of the mounting section of the molding punch; a molding unloading plate is fixedly connected below the cap, and the molding unloading plate is slidably sleeved on the molding punch; a unloading spring is provided on the upper template for driving the molding unloading plate to slide away from the upper template.

[0012] Optionally, a curved surface is provided at the bottom end of the punching section, and an arc-shaped chamfer is provided at the intersection of the curved surface and the side wall of the forming punch.

[0013] Optionally, a perforated connection seat is fixedly provided on the upper template, and the perforated punch is detachably provided on the perforated connection seat.

[0014] Optionally, the flat high unloading plate is slidably sleeved on a perforated connecting seat, and an adjusting screw is provided on the upper template to limit the sliding of the flat high unloading plate.

[0015] In summary, the present application includes at least one of the following beneficial technical effects: 1. This application can significantly improve the material utilization rate of the inner ring of the bearing, reduce the time of subsequent processing steps, and thus shorten the manufacturing cycle. Specifically, by roughening the blank, the middle section of the blank is made to bulge outward with a certain arc, which is convenient for the subsequent positioning and deformation of the blank; the blank is reversely extruded by a special punch and die to form a preliminary shape close to the finished product, and the shape of the blank is further refined through punching and flattening steps, which helps to reduce the workload of subsequent lathe processing. Finally, the final forging is obtained through hole expansion and fine processing. The entire process is formed by step-by-step forging, which simplifies the processing steps and improves the processing efficiency, while avoiding material waste, and achieving the goals of high quality, low cost and short delivery time.

[0016] 2. The improved bearing inner ring forging processing equipment of the present application realizes efficient forging processing of the bearing inner ring. Specifically, by setting a roughening station, a reverse extrusion station and a punching station, and then through the mutual cooperation between the upper template and the lower template, the deformation process of the blank can be accurately controlled, the processing efficiency can be improved, and the processing steps can be simplified.

[0017] 3. In this application, a union nut is sleeved on the forming connecting seat in a sliding manner, and a forming unloading plate is fixedly arranged below the union nut. The forming unloading plate is sleeved on the forming punch in a sliding manner. When the forming punch performs backward extrusion on the blank, the elastic unloading plate abuts against the top end of the blank, and the elastic unloading plate slides on the forming punch. When the crimping portion of the union nut abuts against the bottom end of the installation section of the forming punch, the forming unloading plate stops sliding, limits the top end of the blank, controls the deformation direction of the top end of the blank, and improves the precision of backward extrusion deformation of the blank. After the backward extrusion forming of the blank is completed, the forming punch moves upward. At this time, the forming unloading plate presses the top end of the blank under the elastic force of the unloading spring. At the same time, the forming unloading plate and the forming punch slide relative to each other, so that the forming punch can be separated from the blank, improving the convenience of use. Brief Description of the Drawings

[0018] Figure 1 is a schematic structural diagram for expressing the existing inner ring of a bearing; Figure 2 is a process flow chart of Embodiment 1 of this application; Figure 3 is a schematic structural diagram for expressing the mandrel in Embodiment 1 of this application; Figure 4 is a schematic overall structure diagram of Embodiment 2 of this application; Figure 5 is a schematic structural diagram for expressing the backward extrusion station in Embodiment 2 of this application; Figure 6 is a schematic structural diagram for expressing the forming punch in Embodiment 2 of this application; Figure 7 is a schematic structural diagram for expressing the punching station in Embodiment 2 of this application; Figure 8 is a schematic structural diagram for expressing the flat high unloading plate in Embodiment 2 of this application.

[0019] Description of the reference numerals: 1, lower template; 11, upsetting station; 12, backward extrusion station; 13, punching station; 14, lower upsetting table; 15, base; 16, forming die; 161, outer die; 162, inner die; 163, washer; 17, bottom bearing platform; 171, bottom iron; 18, punching female die; 19, support seat; 2, upper template; 21, upper upsetting table; 22, forming connecting seat; 23, forming punch; 231, installation section; 232, connecting section; 233, stamping section; 234, conical connection surface; 235, arc surface; 24, union nut; 241, crimping portion; 242, forming unloading plate; 25, unloading spring; 26, perforation connecting seat; 27, perforation punch; 28, flat high unloading plate; 281, boss; 282, screw sleeve; 29, adjusting screw rod; 3, press. Detailed Description of the Embodiments

[0020] The following will be combined with the attached Figure 2 - attached Figure 8 , to clearly and completely describe the technical solutions in the embodiments of the present invention. The described embodiments are only possible technical implementations of the present invention, not all possible implementations. Those skilled in the art can fully combine the embodiments of the present invention to obtain other embodiments without creative labor, and these embodiments are also within the protection scope of the present invention.

[0021] The inventors of this application found that the traditional processing technology of the bearing inner ring is usually directly processed into a ring shape and then subjected to cutting processing. This processing technology has slow processing efficiency and low utilization of raw materials, greatly increasing the product manufacturing cycle and production cost. For this reason, this application discloses an improved forging processing technology and processing equipment for the bearing inner ring, mainly adopting the following solutions: Embodiment 1 Embodiment 1 of this application discloses an improved forging processing technology for the bearing inner ring. Refer to Figure 2 and Figure 3 , including the following steps: Step 1. Blank preparation The blank selects round steel with a diameter of 90 mm, and the material is G20CrNi2MoA, which is obtained by sawing or hot shearing. When blanking, it is necessary to ensure that the shape and size of the blank meet the requirements and conduct quality inspection through detection equipment.

[0022] Step 2. Upsetting Heat the blank to the plastic deformation temperature, which is usually 1150°C - 1250°C, and then upset the blank to make the middle section of the blank bulge outwards with a certain arc, facilitating the positioning and deformation of the blank in the subsequent workstations.

[0023] Step 3. Reverse extrusion forming By setting a special punch and die, reverse extrusion is performed on the upset blank to make the blank deform. At the same time, through the restriction of the punch and the die, the blank flows and deforms in a predetermined direction to form a preliminary shape close to the finished product. After the blank is formed by reverse extrusion, the side wall of the blank is L-shaped, the top end of the blank is a large end face, the bottom end is a small end face, a blind hole is formed in the middle of the top end of the blank, and a conical surface with a certain angle and depth is formed at the junction of the blind hole and the top end of the blank. The depth of the conical surface is about 15 mm, and the angle is about 20°.

[0024] Step 4. Punching After the blank is formed by reverse extrusion, punch the blank through the punch. The punch is inserted into the blind hole in the middle of the blank to punch through the blind hole on the blank.

[0025] Step 5. Flattening After the blank is punched, the top end and the conical surface of the blank are extruded to refine the shapes of the top end and the conical surface of the blank, so that both the top end and the conical surface of the blank meet the process requirements, which helps to reduce the workload of subsequent turning processing; after the flatness is completed, the top end of the blank is flush, and the final forming angle of the conical surface is between 15° and 25°, and the depth is between 13 mm and 15 mm.

[0026] Step 6, reaming Place the blank into the reaming equipment, and use the mandrel to roll-expand the inner hole and the conical surface of the blank, so that the inner hole and the conical surface of the blank meet the process requirements; the side wall of the mandrel is provided with a conical end surface matching the conical surface, so as to perform profiling roll-expansion on the conical surface. The front end of the mandrel has a taper, the angle is generally between 25° and 45°, the height is between 10 mm and 20 mm, and its top end needs to maintain a sharp angle to control the generation of defects.

[0027] Step 7, finish machining Perform finish machining on the whole blank and precisely control the shapes and sizes of all positions of the blank to obtain the final forging. The finish machining includes a lathe and a grinding machine. The lathe is used to machine the outer diameter and inner diameter of the blank, and the grinding machine is used to machine the surface finish of the blank.

[0028] The implementation principle of the improved bearing inner ring forging process in Embodiment 1 of the present application is as follows: by optimizing the processing technology, the material utilization rate of the bearing inner ring is improved, and the time of subsequent processing procedures is reduced, thereby shortening the manufacturing cycle. Specifically, by upsetting the blank, the middle section of the blank bulges out a certain arc, which is convenient for the subsequent positioning and deformation of the blank; by using a special punch and die to perform backward extrusion processing on the blank, the blank forms a preliminary shape close to the finished product, and then through the punching and flatness steps, the shape of the blank is further refined, which helps to reduce the workload of subsequent turning processing. Finally, through reaming and finish machining, the final forging is obtained. The whole process is formed by step-by-step forging, which simplifies the processing steps, improves the processing efficiency, and at the same time avoids material waste, achieving the goals of high quality, low cost and short delivery time.

[0029] The process after the above optimization and adjustment can be used to process the bearing inner rings of heavy-duty trucks, the material utilization rate of the forgings is increased by 77%, leading the industry by 10%. Compared with before optimization, 0.63 kg of materials can be saved for each bearing inner ring, and this alone can save millions of yuan of raw material costs for the enterprise annually.

[0030] Embodiment 2 Embodiment 2 of the present application discloses an improved bearing inner ring forging processing equipment. Refer to Figure 4, including a lower template 1, an upper template 2 and a press 3. The press 3 is used to drive the upper template 2 to slide in the vertical direction. A upsetting station 11, a backward extrusion station 12 and a punching station 13 are respectively arranged on the lower template 1. Specifically, a lower upsetting table 14 is arranged at the upsetting station 11 of the lower template 1, and an upper upsetting table 21 is installed on the upper template 2. The upper upsetting table 21 corresponds to the lower upsetting table 14 in position, and the top wall of the lower upsetting table 14 and the bottom wall of the upper upsetting table 21 are both horizontally arranged. Place the blank on the lower upsetting table 14, drive the upper template 2 to move down by the press 3, drive the upper upsetting table 21 to move down, and the upper upsetting table 21 and the lower upsetting table 14 respectively extrude the upper and lower ends of the blank, so that the middle section of the blank bulges outwards by a certain arc, and the upsetting of the blank is completed.

[0031] Refer to Figure 4 , a base 15 is placed at the upsetting station 11 of the lower template 1. A receiving groove is opened at the top end of the base 15. The lower upsetting table 14 is adapted to the receiving groove, and the lower upsetting table 14 is placed in the receiving groove. A backing plate is arranged between the bottom wall of the lower upsetting table 14 and the receiving groove, and the upper upsetting table 21 is fixed on the upper template 2 by bolts. With this design, it is convenient to maintain and replace the lower upsetting table 14 and the upper upsetting table 21.

[0032] Refer to Figure 4 , 5 , a forming die 16 is arranged at the backward extrusion station 12 of the lower template 1. A forming connection seat 22 is installed and fixed on the upper template 2 by bolts. The length direction of the forming connection seat 22 is vertical. A forming punch 23 is installed at the bottom end of the forming connection seat 22. The forming punch 23 is fixed to the forming connection seat 22 by bolts. The forming punch 23 corresponds to the forming die 16 in position, and the length direction of the forming punch 23 is vertical.

[0033] Refer to Figure 5 , specifically, the forming die 16 includes an outer die 161 and an inner die 162. A bottom bearing platform 17 is arranged at the backward extrusion station 12 of the lower template 1. An installation groove is opened at the top end of the bottom bearing platform 17. The outer die 161 plate is adapted to the installation groove, and the outer die 161 plate is placed in the installation groove. The inner die 162 is adapted to the outer die 161. A convex portion is arranged on the side wall of the inner die 162. A groove is opened at the bottom end of the outer die 161 along the axial direction of the outer die 161. The groove is adapted to the convex portion. The inner diameter of the inner die 162 plate gradually decreases along the direction close to the bottom bearing platform 17. With this design, it is convenient to maintain and replace the forming die 16. At the same time, the combined design of the outer die 161 and the inner die 162 can accurately constrain the deformation direction of the blank, improve the forming accuracy of the forging, and simplify the subsequent processing procedures.

[0034] Refer to Figure 5, a washer 163 is further arranged inside the outer mold 161. The washer 163 is arranged at the bottom of the inner mold 162 and abuts against the lower side wall of the installation groove. A central hole is formed in the bottom bearing platform 17, and the central hole is communicated with the installation groove. A bottom iron 171 is placed in the central hole. The bottom iron 171 penetrates through the washer 163 and the inner mold 162 and is adapted to the inner mold 162. A backing plate is also arranged below the bottom iron 171. Through the arrangements of the washer 163 and the bottom iron 171, the inner mold 162 can be effectively supported and the pressure can be evenly distributed, preventing the mold from being damaged due to excessive pressure during the backward extrusion process. In addition, the design that the bottom iron 171 is adapted to the forming die 16 ensures that the flow direction and forming effect of the metal material during the backward extrusion process of the blank are more precisely controllable, further improving the quality and consistency of the forging.

[0035] Refer to Figure 5 , 6 , specifically, the forming punch 23 includes an installation section 231, a connection section 232 and a stamping section 233. The installation section 231 abuts against the bottom end of the forming connection seat 22 and is fixed to the forming connection seat 22. The connection section 232 is arranged between the installation section 231 and the stamping section 233. A conical connection surface 234 is arranged at the connection between the connection section 232 and the stamping section 233. The diameter of the stamping section 233 gradually decreases along the direction away from the connection section 232. The conical connection surface 234 between the connection section 232 and the stamping section 233 can form a conical surface with a certain angle and depth on the blank, thereby improving the shape accuracy of the forging. The design that the diameter of the stamping section 233 gradually decreases helps the metal material to flow evenly during the forming process and reduces the generation of defects.

[0036] Refer to Figure 6 , an arc surface 235 is arranged at the bottom end of the stamping section 233, and an arc chamfer is arranged at the junction of the arc surface 235 and the side wall of the forming punch 23. The arc surface 235 arranged at the bottom end of the stamping section 233 can make the inner hole edge of the blank smoother during the backward extrusion process, reduce stress concentration, and thus improve the forming quality of the forging. The arc chamfer arranged at the junction of the arc surface 235 and the side wall of the forming punch 23 further optimizes the flow performance of the metal material, avoids cracks or defects at the sharp corner parts, and ensures the uniformity and integrity of the internal structure of the forging.

[0037] Refer to Figure 5A cap 24 is slidably sleeved on the forming connection seat 22, and a crimping portion 241 is arranged inside the cap 24. The crimping portion 241 is integrally formed with the cap 24 and is located below the mounting section 231 of the forming punch 23. A forming unloading plate 242 is fixedly connected to the cap 24 by bolts below the cap 24. The forming unloading plate 242 is slidably sleeved on the connecting section 232 of the forming punch 23 and is adapted to the connecting section 232 of the forming punch 23. A unloading spring 25 is arranged on the upper template 2. The unloading spring 25 are connected to the cap 24 and the upper template 2 respectively; when the forming punch 23 is in the process of reverse extrusion of the blank, the elastic stripper plate abuts against the top of the blank, and the elastic stripper plate slides on the forming punch 23, and compresses the stripper spring 25. When the crimping portion 241 of the cap 24 abuts against the bottom end of the mounting section 231 of the forming punch 23, the forming stripper plate 242 stops sliding, limits the top of the blank, controls the deformation direction of the top of the blank, and improves the accuracy of the reverse extrusion deformation of the blank. After the reverse extrusion molding of the blank is completed, the forming punch 23 moves up. At this time, the forming stripper plate 242 presses the top of the blank under the elastic force of the stripper spring 25. At the same time, the forming stripper plate 242 and the forming punch 23 slide relative to each other, so that the forming punch 23 can be separated from the blank, which improves the convenience of use.

[0038] Reference Figure 7 The punching station 13 of the lower template 1 is equipped with a punching die 18, and a perforated connection seat 26 is fixed on the upper template 2 by bolts. The length direction of the perforated connection seat 26 is vertical, and a perforated punch 27 is fixed to the bottom of the perforated connection seat 26 by bolts. The length direction of the perforated punch 27 is vertical, and the perforated punch 27 and the flat discharge plate 28 are both in position corresponding to the punching die 18; specifically, a support seat 19 is provided at the punching station 13 of the lower template 1, and the punching die 18 is fixed to the top of the support seat 19 by bolts. A through hole is provided in the middle of the punching die 18, and a discharge hole is provided on the support seat 19. The discharge hole corresponds to the position of the through hole and is connected to each other. Put the blank into the perforated die, drive the upper template 2 to move down by the press 3, drive the perforated punch 27 to move down, and insert the perforated punch 27 into the blind hole in the middle of the blank to punch the blind hole on the blank.

[0039] Reference Figure 7 , 8, a flat high blanking plate 28 is also slidably sleeved on the perforating connecting seat 26. The flat high blanking plate 28 is horizontally arranged. A convex platform 281 is arranged at the bottom end of the flat high blanking plate 28, and the side wall of the convex platform 281 has a certain taper. An adjusting screw rod 29 is rotatably arranged on the upper template 2. The length direction of the adjusting screw rod is vertical. A screw sleeve 282 is fixedly arranged on the flat high blanking plate 28. The adjusting screw rod is inserted into the screw sleeve 282 and is in threaded cooperation with the screw sleeve 282. After the perforating punch 27 punches the blank, the upper template 2 continues to slide downwards, so that the flat high blanking plate 28 abuts against the top end of the blank. The shape of the top end of the blank is refined by the flat high blanking plate 28, and the shape of the conical surface of the blank is refined by the convex platform 281, so that both the top end and the conical surface of the blank meet the process requirements. And the flat high blanking plate 28 is slidably sleeved on the perforating connecting seat 26 and its sliding is restricted by the adjusting screw rod 29, thereby realizing the precise control of the position of the flat high blanking plate 28 and improving the forming precision of the forging.

[0040] The implementation principle of the improved bearing inner ring forging and processing equipment in Embodiment 2 of the present application is as follows: By arranging a upsetting station 11, a backward extrusion station 12 and a punching station 13 on the lower template 1, the deformation process of the blank is precisely controlled, the processing efficiency is improved, and the processing steps are simplified. Specifically, the lower upsetting table 14 at the upsetting station 11 cooperates with the upper upsetting table 21 to make the middle section of the blank bulge outwards with a certain arc, which is convenient for subsequent positioning and deformation; at the backward extrusion station 12, the forming die 16 and the forming punch 23 cooperate with each other to make the side wall of the blank in an L shape, a blind hole is formed in the middle, and a conical surface with a certain angle and depth is formed at the junction of the blind hole and the top end, effectively improving the material utilization rate and the forming precision; at the punching station 13, the perforating female die and the perforating punch 27 cooperate to punch through the blind hole and further refine the shape of the blank. The flat high blanking plate 28 is horizontally arranged and has a convex platform 281 with a taper at the bottom end, which can extrude the top of the blank after punching and refine the shapes of the top end and the conical surface to ensure that the process requirements are met.

[0041] The above are all the preferred embodiments of the present application, and the protection scope of the present application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. An improved forging process for bearing inner rings, characterized in that, It includes the following steps: Step 1, blank preparation: Select a cylindrical blank and ensure that the shape and size of the blank meet the requirements. Step 2, upsetting: Heat the blank to the plastic forming temperature, and then upset the blank to make the middle section of the blank bulge outwards with a certain arc. Step 3, backward extrusion forming: Use a special mold and punch to perform backward extrusion on the upset blank. Through the restriction between the punch and the mold, make the side wall of the blank be L-shaped, form a blind hole in the middle of the blank, and form a conical surface with a certain angle and depth at the junction of the blind hole and the top end of the blank. Step 4, punching: Punch the blank through the punch to punch through the blind hole on the blank. Step 5, flattening and heightening: After the blank is punched, extrude the top end and the conical surface of the blank to refine the shape of the top end and the conical surface of the blank to meet the process requirements. Step 6, hole expanding: Place the blank in the hole expanding equipment, and use a mandrel to roll-expand the inner hole and the conical surface of the blank to make the inner hole and the conical surface of the blank meet the process requirements. Step 7, finish machining: Perform finish machining on the whole blank and precisely control the shape and size of each position of the blank to obtain the final forging.

2. An improved forging and processing equipment for the bearing inner ring, which is applied to the improved forging and processing process of the bearing inner ring described in Claim 1, and is characterized in that: It includes a lower template (1), an upper template (2) and a press (3). The press (3) is used to drive the upper template (2) to slide in the vertical direction. A upsetting station (11), a backward extrusion station (12) and a punching station (13) are respectively arranged on the lower template (1). A lower upsetting table (14) is arranged at the upsetting station (11). A forming die (16) is arranged at the backward extrusion station (12). A punching female die (18) is installed at the punching station (13). An upper upsetting table (21), a forming punch (23), a perforating punch (27) and a flattening and unloading plate (28) are respectively arranged on the upper template (2). And the upper upsetting table (21) corresponds to the lower upsetting table (14) in position. The forming punch (23) corresponds to the forming die (16) in position. The perforating punch (27) and the flattening and unloading plate (28) both correspond to the punching female die (18) in position. The flattening and unloading plate (28) is horizontally arranged. A convex platform (281) is arranged at the bottom end of the flattening and unloading plate (28). The side wall of the convex platform (281) has a certain taper.

3. An improved bearing inner ring forging and processing equipment according to claim 2, characterized in that: The forming die (16) includes an outer die (161) and an inner die (162). A bottom bearing platform (17) is arranged on the lower template (1). An installation groove is opened at the top end of the bottom bearing platform (17). The outer die (161) is adapted to the installation groove, and the outer die (161) is placed in the installation groove. The inner die (162) passes through the outer die (161) and is adapted to the outer die (161). The inner diameter of the inner die (162) gradually decreases along the direction close to the bottom bearing platform (17).

4. An improved bearing inner ring forging and processing equipment according to claim 3, characterized in that: A gasket (163) is also provided in the outer mold (161), and the gasket (163) is arranged at the bottom of the inner mold (162). A center hole is opened on the bottom support platform (17), and the center hole is connected to the installation groove. A bottom iron (171) is placed in the center hole, and the bottom iron (171) is inserted into the gasket (163) and the inner mold (162) and is compatible with the inner mold (162).

5. An improved bearing inner ring forging and processing equipment according to claim 2, characterized in that: A forming connection seat (22) is fixedly arranged on the upper template (2), and the forming punch (23) is detachably arranged on the forming connection seat (22).

6. An improved bearing inner ring forging and processing equipment according to claim 5, characterized in that: The forming punch (23) comprises a mounting section (231), a connecting section (232) and a punching section (233); the mounting section (231) is fixedly connected to the forming connecting seat (22); the connecting section (232) is arranged between the mounting section (231) and the punching section (233); a conical connecting surface (234) is arranged at the connection between the connecting section (232) and the punching section (233) for forming a conical surface on the blank; the diameter of the punching section (233) gradually decreases in a direction away from the connecting section (232).

7. An improved bearing inner ring forging and processing equipment according to claim 6, characterized in that: A cap (24) is slidably sleeved on the forming connection seat (22), and the cap (24) is provided with a crimping portion (241) for abutting against the bottom end of the mounting section (231) of the forming punch (23). A forming unloading plate (242) is fixedly connected below the cap (24), and the forming unloading plate (242) is slidably sleeved on the forming punch (23). A unloading spring (25) is provided on the upper template (2) for driving the forming unloading plate (242) to slide in a direction away from the upper template (2).

8. An improved bearing inner ring forging and processing equipment according to claim 6, characterized in that: The bottom end of the punching section (233) is provided with a curved surface (235), and the intersection of the curved surface (235) and the side wall of the forming punch (23) is provided with an arc chamfer.

9. An improved bearing inner ring forging and processing equipment according to claim 2, characterized in that: A perforated connection seat (26) is also fixedly arranged on the upper template (2), and the perforated punch (27) is detachably arranged on the perforated connection seat (26).

10. An improved bearing inner ring forging and processing equipment according to claim 9, characterized in that: The flat high discharge plate (28) is slidably sleeved on the perforated connecting seat (26), and an adjusting screw rod (29) is arranged on the upper template (2) to limit the sliding of the flat high discharge plate (28).

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