Method and die for tower forging and cold rolling forming of bearing with clamping groove in outer ring

Abstract

The invention discloses a forming process of a bearing with a clamping groove in an outer ring, which comprises the following steps of: designing a bearing forging tower piece, and calculating the weight and the volume of a material required by the bearing forging tower piece; a high-speed upsetting forming machine is used for sequentially carrying out the procedures of blanking, upsetting, tower forging forming, separating and punching, and an outer ring forging blank and an inner ring forging blank of the bearing are obtained; the outer ring forging blank is placed in a cold ring rolling forming die to be subjected to ring rolling forming, and an outer ring cold rolling blank capable of being used for turning can be obtained; turning the outer ring cold-rolled blank and the inner ring forged blank, and removing the reserved allowance to obtain a finished bearing inner ring and a finished bearing outer ring; and the bearing finished product inner ring and the bearing finished product outer ring are finally assembled with other bearing accessories after being subjected to heat treatment and subsequent machining, and a bearing finished product piece is obtained. The method has the beneficial effects that the step asymmetric section blank which cannot be stably formed through traditional cold ring rolling is obtained through the cold ring rolling procedure, the two requirements for reducing the turning allowance and reducing the inner diameter and the outer diameter of the forging blank are met at the same time, the service life of a tool is prolonged, and meanwhile the diameter of a waste core is reduced; and the cutter cost and the material waste are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of bearing manufacturing, and in particular to a forging cold rolling forming method and a die for a bearing tower with a slot on the outer ring. Background Art

[0002] As the most common type of rolling bearing, deep groove ball bearings are widely used in many fields such as motors, fans, engines, gearboxes, gearboxes, etc. due to their low friction coefficient, high speed, simple structure and easy use. One type of bearing used in gearboxes needs to be assembled with a card plate to form a bearing assembly. Compared with ordinary deep groove ball bearings, the biggest difference is that the outer diameter of the outer ring is provided with an annular card groove, and one side of the outer diameter has an annular step, and the product has two outer diameters, one large and one small. In order to process such products, there are two mainstream ways to produce blanks: 1. Direct hot forging to form a blank with a large and a small outer diameter with a contoured step. 2. Use cold rolling technology to process a straight barrel blank without a small outer diameter step. The former does not use rolling technology, and the forging process causes a lot of material waste caused by punching. The latter has no steps on the outer diameter, and the subsequent machining allowance is uneven, the allowance at the step is large, the tool life of the processing part is reduced, the risk of tool collapse is increased, and the quality stability is seriously affected. With the continuous expansion of the market for such bearings, it is urgent to provide a production process with lower cost and better quality.

[0003] Therefore, if the blank with asymmetric profiled steps in the outer diameter section can be cold rolled, the forging consumption can be reduced while the subsequent machining allowance can be reduced, thus extending the tool life. Since the change in the aperture expansion speed of cold rolling is related to the wall thickness, when cold rolling a blank with an asymmetric cross section, it is necessary to solve the problem of the design of the forging blank shape and the cold rolling process, so that the change in the aperture expansion speed of the blank is stable, otherwise the cold rolling forming will not be stable. Summary of the invention

[0004] The purpose of the present invention is to provide a process and a die for cold forging and rolling of a bearing tower with a slot on the outer ring, in view of the deficiencies of the prior art, so as to ensure the subsequent processing allowance of the bearing.

[0005] The technical solution adopted by the present invention is: a bearing forming process with a slot on the outer ring, the process comprising the following steps:

[0006] S1. Design the bearing forging tower and calculate the weight and volume of the materials required for the bearing forging tower;

[0007] S2. Using a high-speed upsetting machine, sequentially performing blanking, upsetting, tower forging, separation, and punching steps to obtain an outer ring forging blank and an inner ring forging blank of the bearing;

[0008] S3, placing the outer ring forging blank in a cold rolling forming die for rolling forming, thereby obtaining an outer ring cold rolled blank that can be used for lathing;

[0009] S4, turning the outer ring cold-rolled blank and the inner ring forged blank to obtain the finished inner ring and the finished outer ring of the bearing after removing the reserved margin;

[0010] S5. After heat treatment and subsequent processing, the finished inner ring and outer ring of the bearing are finally assembled with other bearing accessories to obtain the finished bearing.

[0011] According to the above scheme, the specific method for obtaining the material weight and volume of the bearing forging tower in step S1 is:

[0012] S10. According to the size of the finished bearing with a slot on the outer ring, the turning allowance is increased to design the sizes of the inner ring blank and the outer ring blank that can be used for turning, wherein the inner ring blank is an inner ring forging blank, and the outer ring blank is an outer ring cold rolling blank;

[0013] S11. Dimensions of outer ring forging blank designed for cold rolling to obtain outer ring cold rolled blank;

[0014] S12, calculate and obtain the total width Bp1 of the outer ring forging blank and the step width Bp2 of the outer ring forging, Bp1 = B1-b, Bp2 = B2-b; b is the necessary clearance dimension for the outer ring forging blank to smoothly enter the rolling wheel;

[0015] S13, the outer ring forging blank includes a first annular structure and a second annular structure coaxially arranged inside and outside, the outer diameter of the first annular structure = the inner diameter of the second annular structure = the outer ring forging small outer diameter Dp2 of the outer ring forging blank, and the size of the first annular structure P1, that is, the outer ring forging small outer diameter Dp2 of the outer ring forging blank is calculated;

[0016] S14, calculating the inner diameter of the second annular structure;

[0017] S15, adding fillets and draft angles to the outer ring forging blank obtained in S14, so as to obtain the size of the formed outer ring forging blank.

[0018] According to the above scheme, in step S10, the turning allowance is all unilateral allowance, the turning allowance increased by 0.5-0.6mm for the small outer diameter Dn2 of the inner ring forging blank, and the size of the large outer diameter Dn1 of the inner ring forging is increased by 0.1-0.4mm on the basis of the small outer diameter Dn2 of the inner ring forging according to the actual demolding needs; the turning allowance increased by 0.6-0.7mm for the large inner diameter dn1 of the inner ring forging blank, and the small inner diameter dn2 of the inner ring forging is further reduced by 0.3-0.6mm on the basis of the large inner diameter dn1 of the inner ring forging, and the turning allowance increased by 0.7-0.8mm for the width Bn of the inner ring forging.

[0019] According to the above scheme, in step S10, the turning allowances of the large outer diameter D1 and the small outer diameter D2 of the outer ring cold rolled blank are 0.5mm, and the turning allowance of the inner diameter d of the outer ring rolled part is 0.6mm; the turning allowances of the total width of the outer ring rolled part and the step width of the outer ring rolled part are 0.6mm; the turning allowances of the outer ring rolled part raceway depth h are between 1 and 1.5mm, and the turning allowance at the raceway edge is more than 0.6mm.

[0020] According to the above scheme, the specific method of step S11 is: in step S13, first calculate the outer diameter of the first annular structure, and regard the large inner diameter dp1 of the outer ring forging of the outer ring forging blank as equal to the small inner diameter dp2 of the outer ring forging, wherein dp1 is the inner diameter size of the inner hole of the outer ring forging blank at the maximum point; dp2 is the inner diameter size of the inner hole of the outer ring forging blank at the minimum point; according to the principle of volume invariance, when the volume, inner diameter and height are known, the outer diameter of the first annular structure, that is, the small outer diameter Dp2 of the outer ring forging of the outer ring forging blank, can be calculated.

[0021] According to the above scheme, the specific method of step S14 is: the inner diameter of the second annular structure is the outer diameter of the first annular structure, that is, the small outer diameter Dp2 of the outer ring forging; according to the principle of volume invariance, when the volume, inner diameter and height are known, the outer diameter of the second annular structure can be calculated, that is, the large outer diameter Dp1 of the outer ring forging of the outer ring forging blank.

[0022] According to the above scheme, the specific method of the blanking process in step S2 is: according to the weight and volume of the material required for the bearing forging tower, the appropriate diameter of the bar and the blanking length are selected according to the principle of the aspect ratio of 0.8-1.2.

[0023] According to the above scheme, the specific method of the roughening process in step S2 is: the roughening diameter can be obtained by subtracting 1mm from the maximum outer diameter Dp1 of the bearing forging tower, and then the cake diameter and thickness after roughening are calculated according to the weight and volume of the required material.

[0024] According to the above scheme, the specific method of rolling forming in step S3 is: the outer ring forging blank obtained in S2 is placed in the cold rolling forming area of ​​the bearing outer ring cold rolling forming mold with a groove on the outer periphery and fixed stably therein, and the outer ring forging blank is cold extruded by a rolling wheel and a rolling mandrel to obtain the outer ring cold rolled blank.

[0025] The present invention also adopts a cold rolling forming die for the outer ring of a bearing with a groove on the outer periphery, comprising a rolling wheel and a rolling mandrel, wherein the outer periphery of the rolling wheel is provided with a first groove, the bottom of the first groove is provided with a step protrusion, and the step protrusion is adapted to the designed outer periphery groove of the outer ring cold-rolled part; the outer periphery of the rolling mandrel is provided with a second groove, the center of the second groove is provided with an annular protrusion, and the annular protrusion is adapted to the raceway of the designed outer ring cold-rolled blank; the first groove is directly opposite to the second groove of the rolling mandrel, forming a cold rolling forming area for placing the outer ring forging blank and rolling it.

[0026] The beneficial effects of the present invention are:

[0027] 1. The method of the present invention obtains a stepped asymmetric cross-section blank that cannot be stably formed by traditional cold rolling, and at the same time meets the two requirements of reducing the turning allowance and reducing the inner and outer diameters of the forging blank, thereby increasing the tool life while reducing the diameter of the waste core, reducing the tool cost and material waste.

[0028] 2. Compared with the blanks directly hot forged for turning, the present invention adopts a cold rolling process to reduce the inner and outer diameters of the forged blanks, thereby reducing the diameter of the scrap core and reducing material waste.

[0029] 3. Compared with the cold-rolled stepless blank, the present invention can obtain a bearing outer ring blank with a step on the outer diameter due to the use of a cold-rolled forming die with a step protrusion, leaving less margin for subsequent turning, which can effectively increase the life of the tool, reduce the risk of tool breakage, and improve quality stability.

[0030] 4. Compared with the traditional cold rolled blank design method, the asymmetric forging blank with a stepped cross section derived by the method of separately calculating the inner and outer annular structures adopted in the present invention is easier to cold roll, effectively improving the stability of the cold rolled blank. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic structural diagram of a bearing finished part in a specific embodiment of the present invention.

[0032] Figure 2 It is a schematic diagram of the structure of the bearing forging tower in this embodiment.

[0033] Figure 3 Schematic diagram of the structure of the bearing inner ring forging blank in this embodiment.

[0034] Figure 4 Schematic diagram of the structure of the cold-rolled blank of the bearing outer ring in this embodiment.

[0035] Figure 5 Schematic diagram of the structure of the bearing outer ring forging blank in this embodiment.

[0036] Figure 6 It is a schematic diagram of the separation of the inner and outer rings of the bearing forging tower and the punching of the inner ring in this embodiment.

[0037] Figure 7 It is a structural schematic diagram of a tower forging cold rolling die for a bearing ring with a groove on the outer ring in this embodiment (before cold rolling forming).

[0038] Figure 8 It is a schematic diagram of the outer ring forging blank after cold rolling and expansion in this embodiment.

[0039] Among them: 1. rolling wheel; 2. rolling mandrel; 2.1. annular protrusion; 3. step protrusion; 4. outer ring forging blank; 5. outer ring cold rolled blank; 6. bearing forging tower; 7. slot; 8. bearing finished part; 8.1. inner ring; 8.2. outer ring; 9. inner ring forging blank; P1. first annular structure; P2. second annular structure. DETAILED DESCRIPTION

[0040] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] like Figure 1 The figure shows a finished bearing part 8 with a slot 7 on the outer circumference of the outer ring. The present invention obtains the finished bearing part by a cold rolling forming process of a bearing tower segment, which involves a cold rolling forming mold for the outer ring of the bearing with a slot.

[0042] This embodiment provides a bearing forming process with a groove on the outer ring, the process comprising the following steps:

[0043] S1. Design bearing forging tower 6 (such as Figure 2 As shown), and calculate the weight and volume of the material required for the bearing forging tower 6;

[0044] S2, using a high-speed upsetting machine, sequentially performing blanking, upsetting, tower forging, separation, and punching steps to obtain a bearing outer ring forging blank 4 (such as Figure 5 As shown) and inner ring forging blank 9 (as shown Figure 3 shown);

[0045] S3, placing the outer ring forging blank 4 between the rolling wheel 1 and the rolling mandrel 2 of the cold rolling forming die for rolling forming, and then obtaining the outer ring cold rolled blank 5 (such as Figure 4 shown).

[0046] S4, lathe the outer ring cold-rolled blank 5 and the inner ring forged blank 9 to obtain a finished bearing inner ring 8.1 and a finished bearing outer ring 8.2 after removing the reserved margin.

[0047] S5. After heat treatment and subsequent processing (conventional processing), the finished bearing inner ring 8.1 and the finished bearing outer ring 8.2 are finally assembled with other bearing accessories to obtain the finished bearing part 8.

[0048] In the present invention, the specific method for obtaining the material weight and volume of the bearing forging tower in step S1 is:

[0049] S10, according to the size of the finished bearing part 8 with a slot on the outer ring, increase the machining allowance, and combine the characteristics of high-speed forging to design the sizes of the inner ring blank and outer ring blank that can be used for machining, wherein the inner ring blank is the inner ring forging blank 9, such as Figure 3 As shown, the outer ring blank is an outer ring cold rolled blank 5, such as Figure 4 As shown, the outer periphery of the finished bearing outer ring 8.2 is provided with a groove 7, such as Figure 1 shown.

[0050] In the present invention, the size parameters of the inner ring forging blank 9 include the inner ring forging large outer diameter Dn1, the inner ring forging small outer diameter Dn2, the inner ring forging large inner diameter dn1, the inner ring forging small inner diameter dn2 and the inner ring forging width Bn, and the unit of each parameter is mm; Figure 3 As shown, the large outer diameter Dn1 of the inner ring forging is the maximum outer diameter of the outer circle of the inner ring forging blank 9, the small outer diameter Dn2 of the inner ring forging is the minimum outer diameter of the outer circle of the inner ring forging blank 9, the large inner diameter dn1 of the inner ring forging is the maximum inner diameter of the inner hole of the inner ring forging blank 9, the small inner diameter dn2 of the inner ring forging is the minimum inner diameter of the inner hole of the inner ring forging blank 9, and the inner ring forging width Bn is the distance between the two end faces of the inner ring forging blank 9.

[0051] In the present invention, the size parameters of the outer ring cold rolled blank 5 include the outer ring rolled piece large outer diameter D1, the outer ring rolled piece small outer diameter D2, the outer ring rolled piece inner diameter d, the outer ring rolled piece total width B1, the outer ring rolled piece step width B2 and the outer ring rolled piece raceway depth h, and the unit of each parameter is mm; Figure 4 As shown, the large outer diameter D1 of the outer ring rolled part is the outer diameter dimension of the maximum outer circle of the outer ring cold-rolled blank 5, the small outer diameter D2 of the outer ring rolled part is the outer diameter dimension of the minimum groove step of the outer ring cold-rolled blank 5, the inner diameter d of the outer ring rolled part is the maximum dimension of the two sides of the inner hole of the outer diameter cold-rolled blank 5, the total width B1 of the outer ring rolled part is the distance between the two end faces of the outer ring cold-rolled blank 5; the step width B2 of the outer ring rolled part is the distance from the end with the larger outer diameter of the outer ring cold-rolled blank 5 to the chamfer where the outer diameter of the outer diameter groove step begins to decrease; the raceway depth h of the outer ring rolled part is the value of the maximum diameter at the raceway of the outer ring cold-rolled blank 5 minus the inner diameter d of the outer ring rolled part divided by 2.

[0052] The dimensional parameters of the inner ring forging blank 9 designed in this step include Dn1, Dn2, dn1, dn2, and Bn, and the dimensional parameters of the outer ring cold-rolled blank 5 include D1, D2, d, B1, and B2.

[0053] In the present invention, the machining allowance is a unilateral allowance, and the specific design is as follows: the machining allowance increased by 0.5-0.6mm for the inner ring forging blank 9 inner ring forging small outer diameter Dn2, and the inner ring forging large outer diameter Dn1 size is increased by 0.1-0.4mm on the basis of the inner ring forging small outer diameter Dn2 according to the actual demoulding needs. The machining allowance increased by 0.6-0.7mm for the inner ring forging large inner diameter dn1 of the inner ring forging blank 9, the inner ring forging small inner diameter dn2 is further reduced by 0.3-0.6mm on the basis of the inner ring forging large inner diameter dn1, and the machining allowance increased by 0.7-0.8mm for the inner ring forging width Bn. The machining allowances of the outer ring cold rolled blank 5, the outer ring large outer diameter D1 and the outer ring small outer diameter D2, are 0.5mm, and the machining allowance of the outer ring inner diameter d is 0.6mm; the machining allowances of the outer ring total width B1 and the outer ring step width B2 are 0.6mm; the outer ring rolling track depth h is between 1 and 1.5mm, and the machining allowance at the track edge is more than 0.6mm. In this way, the shape of the inner ring forging blank 9 and the outer ring cold rolled blank 5 is designed, and the volume and mass can also be obtained.

[0054] S11, outer ring forging blank 4 (such as Figure 5 The specific method is:

[0055] According to the large outer diameter Dn1 of the inner ring forging blank 9 designed by S11, the small inner diameter dp2 of the outer ring forging blank 4 (that is, the inner diameter of the smallest inner hole of the outer ring forging blank 4) can be calculated, dp2 = Dn1-a, where a is the necessary blanking size reserved for separating the inner and outer rings when forging in the high-speed forging tower, and can be 0.5mm.

[0056] S12. According to the characteristics of the cold rolling forming method and combined with the size of the outer ring cold rolled blank 5 in S10, the total width Bp1 of the outer ring forging and the width Bp2 of the outer ring forging step of the outer ring forging blank 4 are calculated, Bp1=B1-b, Bp2=B2-b; wherein Bp1 is the distance between the two end faces of the outer ring forging blank 4; Bp2 is the distance from the end with the larger outer diameter of the outer ring forging blank 4 to the starting point of the outer diameter groove step arc; b is the necessary clearance size for the outer ring forging blank 4 to smoothly enter the rolling wheel 1, which can be 0.2mm.

[0057] S13, the process of cold rolling the outer ring forging blank 4 described in S3 into the outer ring cold rolling blank 5 is regarded as two annular structures with rectangular cross-sections nested together and rolled, that is, the outer ring forging blank 4 includes a first annular structure P1 and a second annular structure P2 coaxially arranged inside and outside, the outer diameter of the first annular structure P1 = the inner diameter of the second annular structure P2 = the outer ring forging blank 4 (such as Figure 5 The outer ring forging small outer diameter Dp2 (as shown), where Dp2 is the minimum outer diameter dimension at the step slot of the outer ring forging blank 4. First calculate the size (outer diameter) of the first annular structure P1. For the convenience of calculation, temporarily ignore the draft angle, and regard the outer ring forging large inner diameter dp1 of the outer ring forging blank as equal to the outer ring forging small inner diameter dp2, where dp1 is the inner diameter dimension at the maximum point of the inner hole of the outer ring forging blank 4; dp2 is the inner diameter dimension at the minimum point of the inner hole of the outer ring forging blank 4; according to the principle of volume invariance, the outer diameter of the first annular structure P1, that is, the outer ring forging small outer diameter Dp2 of the outer ring forging blank 4, can be calculated when the volume, inner diameter, and height are known.

[0058] S14, calculate the size of the second annular structure P2. The inner diameter of the second annular structure P2 is the outer diameter of the first annular structure P1, that is, the outer diameter Dp2 of the outer ring forging. Similarly, according to the principle of volume invariance, when the volume, inner diameter, and height are known, the outer diameter of the second annular structure P2 can be calculated, that is, the outer diameter Dp1 of the outer ring forging blank 4, where Dp1 is the outer diameter size of the outer ring of the outer ring forging blank 4 at the maximum point.

[0059] S15, adding fillets and draft angles to the outer ring forging blank 4 obtained in S14 by conventional methods, so as to obtain the size of the formed outer ring forging blank 4. In the present invention, adding fillets and draft angles is to make the forgings form smoothly, which is a conventional operation in the industry.

[0060] S16, combining the inner ring forging blank 9 designed in S10 and the outer ring forging blank 4 designed in S15 to obtain the designed bearing forging tower 6 (such as Figure 2 As shown), and calculate the weight and volume of the material required for the bearing forging tower 6.

[0061] In the present invention, the inner ring forging blank 9 designed by S10 and the outer ring forging blank 4 designed by S15 are combined, and conventional methods are used to consider the core-skin thickness, fillet connection transition and draft angle, and finally the weight and volume of the material required for the bearing forging tower 6 are designed.

[0062] In step S2, the specific method of the blanking process is: according to the weight and volume of the material required for the bearing forged tower 6, select the appropriate diameter of the bar and the blanking length according to the principle of the aspect ratio of 0.8-1.2. The specific method of the roughing process is: according to the maximum outer diameter Dp1 of the bearing forged tower 6 minus 1mm, the roughing diameter can be obtained, and then the cake diameter and cake thickness after roughing are calculated according to the weight and volume of the required material. The calculation of blanking and roughing is based on the principle of constant volume.

[0063] The specific method of rolling forming in step S3 is: the outer ring forging blank 4 obtained in S2 is placed in the cold rolling forming area between the rolling wheel 1 and the rolling mandrel 2 of the bearing outer ring cold rolling forming mold and fixed stably therein, and the outer ring forging blank 4 is cold extruded by the rolling wheel 1 and the rolling mandrel 2, so as to obtain the outer ring cold rolled blank 5 according to the shape designed by the rolling wheel.

[0064] A cold rolling forming die for a bearing outer ring with a slot on the outer periphery, comprising a rolling wheel 1 and a rolling mandrel 2.

[0065] The outer circumference of the rolling wheel 6 is provided with a first groove, the bottom of the first groove is provided with a step protrusion 4, and the step protrusion 3 is adapted to the designed outer circumferential groove 7 of the outer ring cold-rolled part 5; the outer circumference of the rolling mandrel 2 is provided with a second groove, the center of the second groove is provided with an annular protrusion 2.1, and the annular protrusion 2.1 is adapted to the raceway of the designed outer ring cold-rolled blank 5; the first groove is opposite to the second groove of the rolling mandrel 2, forming a cold rolling forming area for placing the outer ring forging blank 4 and rolling it.

[0066] In the present invention, the rolling wheel 1, the rolling mandrel 2, the two grooves, and the step protrusion 3 form a closed cold rolling forming structure. The outer ring forging blank 4 is sleeved on the outside of the rolling mandrel 2 and is located in the cold rolling forming area. The outer ring cold rolled blank 5 is obtained by cold rolling forming the rolling mandrel 2 and the rolling wheel 1. The design of the step protrusion 3 can limit the axial deformation of the outer ring forging blank 4 at the step of the slot, so that the outer ring cold rolled blank 5 can be stably formed.

[0067] In this embodiment, a tower forging process is adopted for one-time forming, and inner and outer ring forging blanks are obtained simultaneously through separation and punching steps; the outer ring forging blank 4 is formed by cold rolling to obtain an outer ring cold rolled blank 5 that can be used for turning, which not only takes into account the high efficiency of the high-speed upsetting machine and the material saving advantage of the cold rolling process, but also can obtain a stepped blank with a surplus that is more suitable for turning, thereby increasing tool life, reducing quality risks, and improving production efficiency.

[0068] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

[0069] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0070] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to replace some of the technical features therein with equivalents. However, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A bearing forming process with a slot on the outer ring, characterized in that: The process includes the following steps: S1. Design the bearing forging tower and calculate the weight and volume of the materials required for the bearing forging tower; S2. Using a high-speed upsetting machine, sequentially performing blanking, upsetting, tower forging, separation, and punching steps to obtain an outer ring forging blank and an inner ring forging blank of the bearing; S3, placing the outer ring forging blank in a cold rolling forming die for rolling forming, thereby obtaining an outer ring cold rolled blank that can be used for lathing; S4, turning the outer ring cold-rolled blank and the inner ring forged blank to obtain the finished inner ring and the finished outer ring of the bearing after removing the reserved margin; S5. After heat treatment and subsequent processing, the finished inner ring and outer ring of the bearing are finally assembled with other bearing accessories to obtain the finished bearing parts.

2. The outer ring bearing forming process according to claim 1, characterized in that: The specific method for obtaining the material weight and volume of the bearing forging tower in step S1 is: S10. According to the size of the finished bearing with a slot on the outer ring, the turning allowance is increased to design the sizes of the inner ring blank and the outer ring blank that can be used for turning, wherein the inner ring blank is an inner ring forging blank, and the outer ring blank is an outer ring cold rolling blank; S11. Dimensions of outer ring forging blank designed for cold rolling to obtain outer ring cold rolled blank; S12, calculating and obtaining the total width Bp1 of the outer ring forging blank and the step width Bp2 of the outer ring forging blank, Bp1 = B1-b, Bp2 = B2-b; b is the necessary clearance dimension for the outer ring forging blank 4 to smoothly enter the rolling wheel 1; S13, the outer ring forging blank includes a first annular structure and a second annular structure coaxially arranged inside and outside, the outer diameter of the first annular structure = the inner diameter of the second annular structure = the outer ring forging small outer diameter Dp2 of the outer ring forging blank, and the size of the first annular structure P1, that is, the outer ring forging small outer diameter Dp2 of the outer ring forging blank is calculated; S14, calculating the inner diameter of the second annular structure; S15, adding fillets and draft angles to the outer ring forging blank obtained in S14, so as to obtain the size of the formed outer ring forging blank.

3. The outer ring bearing forming process according to claim 1, characterized in that: In step S10, the turning allowances are all unilateral allowances, the turning allowance increased by 0.5-0.6mm for the small outer diameter Dn2 of the inner ring forging blank, and the size of the large outer diameter Dn1 of the inner ring forging is increased by 0.1-0.4mm on the basis of the small outer diameter Dn2 of the inner ring forging according to the actual demolding needs; the turning allowance increased by 0.6-0.7mm for the large inner diameter dn1 of the inner ring forging blank, and the small inner diameter dn2 of the inner ring forging is further reduced by 0.3-0.6mm on the basis of the large inner diameter dn1 of the inner ring forging, and the turning allowance increased by 0.7-0.8mm for the width Bn of the inner ring forging.

4. The outer ring bearing forming process according to claim 1, characterized in that: In step S10, the turning allowances of the outer ring cold-rolled blank's large outer diameter D1 and small outer diameter D2 are 0.5 mm, and the turning allowance of the outer ring inner diameter d is 0.6 mm; the turning allowances of the total width of the outer ring rolled piece and the step width of the outer ring rolled piece are 0.6 mm; the outer ring rolled piece raceway depth h is between 1 and 1.5 mm, and the turning allowance at the raceway edge is more than 0.6 mm.

5. The outer ring bearing forming process according to claim 1, characterized in that: The specific method of step S11 is: in step S13, first calculate the outer diameter of the first annular structure, and regard the large inner diameter dp1 of the outer ring forging of the outer ring forging blank as equal to the small inner diameter dp2 of the outer ring forging, wherein dp1 is the inner diameter size of the inner hole of the outer ring forging blank at the maximum point; dp2 is the inner diameter size of the inner hole of the outer ring forging blank at the minimum point; according to the principle of volume invariance, when the volume, inner diameter and height are known, the outer diameter of the first annular structure, that is, the small outer diameter Dp2 of the outer ring forging of the outer ring forging blank, can be calculated.

6. The outer ring bearing forming process according to claim 1, characterized in that: The specific method of step S14 is: the inner diameter of the second annular structure is the outer diameter of the first annular structure, that is, the small outer diameter Dp2 of the outer ring forging; according to the principle of volume invariance, when the volume, inner diameter and height are known, the outer diameter of the second annular structure can be calculated, that is, the large outer diameter Dp1 of the outer ring forging of the outer ring forging blank.

7. The outer ring bearing forming process according to claim 1, characterized in that: The specific method of the blanking process in step S2 is: according to the weight and volume of the material required for the bearing forging tower, the bar with a suitable diameter and blanking length are selected according to the principle of a length-to-diameter ratio of 0.8-1.

2.

8. The process for forming a bearing with a groove on the outer ring according to claim 1, characterized in that: The specific method of the roughening process in step S2 is: the roughening diameter can be obtained by subtracting 1mm from the maximum outer diameter Dp1 of the bearing forging tower, and then the cake diameter and cake thickness after roughening are calculated according to the weight and volume of the required material.

9. The outer ring bearing forming process according to claim 1, characterized in that: The specific method of the rolling forming in step S3 is: the outer ring forging blank obtained in S2 is placed in the cold rolling forming area of ​​the bearing outer ring cold rolling forming mold with a groove on the outer periphery and fixed stably therein, and the outer ring forging blank is cold extruded by a rolling wheel and a rolling mandrel to obtain the outer ring cold rolled blank.

10. A cold rolling forming die for a bearing outer ring with a groove on the outer periphery, characterized in that: It comprises a rolling wheel and a rolling mandrel, wherein the outer peripheral surface of the rolling wheel is provided with a first groove, the bottom of the first groove is provided with a step protrusion, and the step protrusion is adapted to the designed outer peripheral groove of the outer ring cold-rolled part; the outer periphery of the rolling mandrel is provided with a second groove, the center of the second groove is provided with an annular protrusion, and the annular protrusion is adapted to the raceway of the designed outer ring cold-rolled blank; the first groove is directly opposite to the second groove of the rolling mandrel, forming a cold rolling forming area for placing the outer ring forging blank and rolling it.

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