Cylindrical roller bearing ring shaping process

Abstract

The invention relates to the technical field of shaping of wind power main shaft type bearing rings, in particular to a cylindrical roller bearing ring shaping process, which comprises the following steps: respectively measuring the diameter variation of the outer diameter of the bearing ring close to two end surfaces, and if the diameter variation of only one side is greater than or equal to a standard deformation threshold value, determining that the cylindrical roller bearing ring is shaped. The top taking type tool is installed at the position, with the minimum diameter, of the end of the bearing ring so that the short shaft can be reversely deformed into the long shaft, if the diameter variation of the two sides is larger than or equal to the standard deformation threshold value, the top taking type tool is installed at the position, with the minimum diameter, of the middle of the bearing ring so that the short shaft can be reversely deformed into the long shaft, and shaping and tempering are conducted; respectively measuring the diameter variation for the second time; and if the diameter variation of the two sides is smaller than the standard deformation threshold value, it is judged that the tempering is qualified, and the tempering is completed. The shaping process comprises two times of tempering, the internal structure of the part of the bearing ring can be effectively stabilized, the internal stress is reduced, and the bearing part with the stable size is obtained.

Description

Technical Field

[0001] The invention relates to the technical field of shaping of wind turbine main shaft type bearing rings, and in particular to a cylindrical roller bearing ring shaping process. Background Art

[0002] Ordinary large cylindrical bearings are generally made of high-carbon bearing steel as raw material, and mainly adopt bainite heat treatment method. Specifically, the steel rings are heated to austenite, quenched into a hot bath (nitrate bath, metal bath or floating particle furnace), and kept for a sufficient time to transform all or part of the supercooled austenite into lower bainite structure, and then air-cooled to room temperature.

[0003] However, although the bainite heat treatment method can improve the hardness and wear resistance of metal workpieces, and can also enable some special steels to obtain certain physical and chemical properties, the disadvantage is that the bearing rings will undergo certain deformation after bainite heat treatment. If the rings are not reshaped in the later stage, they cannot meet the requirements of subsequent machining. After turning, the depth of the hardened layer of the ring raceway is inconsistent, and the fatigue life of the bearing is often not high. Summary of the invention

[0004] In view of the defects of the prior art, the present invention provides a cylindrical roller bearing ring shaping process, which strictly controls the shaping position and tempering temperature, and adopts a large shaping amount and a high tempering temperature to ensure that the diameter change after shaping is within the tolerance range.

[0005] In order to achieve the above-mentioned purpose, the technical solution provided by the present invention is a shaping process for a large cylindrical roller bearing ring, and the specific steps thereof include: S100, For example, the height of the cylindrical roller bearing ring is H≤200mm. Measure the outer diameter at the middle position between end face A and end face B, mark the maximum and minimum points of the middle diameter, and obtain the middle diameter variation S o ; If the end face height H of the cylindrical roller bearing ring is greater than 200 mm, Measure the outer diameter of the cylindrical roller bearing ring near the A end face, and mark the maximum and minimum diameter points of the A end face to obtain the diameter variation S A ; Measure the outer diameter of the cylindrical roller bearing ring near the B end face, and mark the maximum and minimum diameter points of the B end face to obtain the diameter variation S. B ; Start S200; S200, If S A , S B If both are greater than the standard deformation threshold, S300 is started; If S A is greater than 1.5 times the standard deformation threshold, and S B is less than or equal to the standard deformation amount threshold, then starting S400; If S A Greater than the standard deformation threshold and less than or equal to 1.5 times the standard deformation threshold, S B is less than or equal to the standard deformation amount threshold, then starting S500; If S A , S B If all are less than or equal to the standard deformation value threshold, then S900 is started; If S o If it is greater than the standard deformation threshold, S600 is started; If S o If it is less than or equal to the standard deformation amount threshold, then S900 is started; S300, comparing the minimum diameter point of the A end face close to the A end face with the minimum diameter point of the B end face close to the B end face to determine whether the projections of the two in the axial direction coincide with each other; If they coincide, install the top-molding tooling at the midpoint between the minimum diameter point of the A end face and the minimum diameter point of the B end face to support and reshape them so that the short axis is deformed into the long axis; If they do not overlap, Then, a first top-forming tool is installed at a position corresponding to the minimum point of the diameter of the A end face on the inner diameter of the cylindrical roller bearing ring close to the A end face, and the top-forming tool is supported and shaped so that the short axis is deformed into the long axis; A second top-forming tool is installed at a position corresponding to the minimum point of the diameter of the B end face on the inner diameter of the cylindrical roller bearing ring close to the B end face to support and shape the short axis so that the short axis is deformed into the long axis; S400, installing a first molding tool at a position corresponding to the minimum diameter point of the A end face on the inner diameter of the cylindrical roller bearing ring close to the A end face, and supporting and shaping the same so that the short axis is deformed into the long axis; A second top-molding tool is installed at a position corresponding to the minimum point of the diameter of the B end face on the inner diameter of the cylindrical roller bearing ring close to the B end face, so as to limit the deformation of one side of the B end face as the other side is shaped; Start S700; S500, installing a top-forming tool at a position corresponding to the minimum point of the diameter of the A end face on the inner diameter of the cylindrical roller bearing ring close to the A end face, and supporting and shaping the top-forming tool so that the short axis is deformed into the long axis; Start S700; S600, install a top-forming tool at a position corresponding to the minimum point of the intermediate diameter on the inner diameter of the cylindrical roller bearing ring, and support and shape it so that the short axis is deformed into the long axis; Start S700; S700, shaping and tempering; S800, after the cylindrical roller bearing ring is air-cooled to room temperature, the top molding tool is removed and S100 is repeated; S900, perform secondary supplementary annealing to complete the shaping.

[0006] Furthermore, measuring the diameter variation of the outer diameter of the cylindrical roller bearing ring includes: using a measuring tube ruler to rotate along the circumferential direction of the cylindrical roller bearing ring, determining the low point and high point of the ring by the number of rotations of the pointer of the dial indicator, and determining the diameter variation.

[0007] Furthermore, the measuring ruler includes a ruler body, an abutment assembly slidably fixed to the ruler body, and a measuring table assembly slidably fixed to the ruler body.

[0008] Furthermore, the tempering temperature of the shaping tempering in S500 is 200°C~270°C, and the tempering time is 10h~15h.

[0009] Furthermore, the tempering temperature of the secondary supplementary tempering in S700 is 200°C~270°C, and the tempering time is 10h~15h.

[0010] Furthermore, the top-type tooling includes a screw top support; the first top-type tooling includes a screw top support; and the second top-type tooling includes a screw top support.

[0011] Furthermore, the rule for reverse deformation of the short axis into the long axis is to adjust the length of the top mold tooling or the first top mold tooling to a certain value so that the diameter change after shaping is equal to the martensite shaping reverse deformation amount or the bainite shaping reverse deformation amount.

[0012] Furthermore, the calculation formula for the reverse deformation of martensite shaping is (1.0~2.5)X+(0.0~0.5mm), where X is the original deformation.

[0013] Furthermore, the calculation formula for the reverse deformation of bainite shaping is (0.5~2.5)X+(0.0~0.5mm), where X is the original deformation.

[0014] The beneficial effects of the present invention are as follows: according to cylindrical roller bearing rings of different heights, the middle position is selected for measurement or the diameter variation on both sides is measured at the same time, and according to different measurement results, the accurate minimum diameter position is found, and the shaping position is strictly controlled. In addition, the shaping process includes two temperings, which can effectively stabilize the internal structure of the bearing ring parts, reduce internal stress, and obtain dimensionally stable bearing parts. The present invention controls the shaping position and tempering temperature, adopts a large anti-shaping amount and a high tempering temperature to ensure that the diameter variation after shaping is within the tolerance range. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of a cylindrical roller bearing ring with a height H≤200mm in one embodiment of the present invention; Figure 2 In one embodiment of the present invention, the height H is greater than 200 mm, and the minimum diameter of the end face A is at point N. A The minimum diameter point of the B end face is N B Schematic diagram of the structure of cylindrical roller bearing rings with overlapping projections; Figure 3 In one embodiment of the present invention, the height H is greater than 200 mm, and the minimum diameter of the end face A is at point N. A The minimum diameter point of the B end face is N B Schematic diagram of the structure of cylindrical roller bearing rings with non-overlapping projections; Figure 4 This is a schematic diagram of the state when measuring the diameter variation in one embodiment of the present invention; Figure 5 It is a schematic diagram of the structure when the top-type tooling is installed in the middle in one embodiment of the present invention; Figure 6 It is a schematic diagram of the structure when the two sides are in an X shape and pushed up in one embodiment of the present invention; Figure 7 It is a schematic diagram of the structure when both sides are parallel to each other in one embodiment of the present invention; Figure 8 This is a schematic diagram of the structure when one side is lifted up in one embodiment of the present invention; Fig. 9 A table showing the allowable variation of the outer diameter of the ferrule in one embodiment of the present invention; Fig.10 This is an integer parameter table of Embodiment 1 to Embodiment 4 of the present invention; In the figure: 1. Measure the pipe ruler, 100. Pipe ruler body, 200, abutment component, 300, measuring table assembly, 2. Cylindrical roller bearing rings, 3. Top tooling, 4. The first top tooling, 5. The second top tooling, 0, middle position, N0, minimum point of middle diameter, M0, maximum point of middle diameter, N A , A end face minimum diameter point, N B , B end face minimum diameter point. DETAILED DESCRIPTION

[0016] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0017] A shaping process for a large cylindrical roller bearing ring, the specific steps of which include: Step S100: If the amplitude height of the cylindrical roller bearing ring 2 is greater than 200 mm, the deformation amounts on both sides close to the A end face and the B end face will be greatly different. Therefore, the amplitude height of the cylindrical roller bearing ring needs to be measured first.

[0018] See also Figure 1 , if the height H of cylindrical roller bearing ring 2 is ≤200mm, measure the outer diameter of the middle position 0 between end face A and end face B, mark the maximum point M0 and the minimum point N0 of the middle diameter, and obtain the middle diameter variation S o Thus, the first step is to selectively measure the minimum point N0 of the middle diameter according to the amplitude height of the cylindrical roller bearing ring 2, thus avoiding the need to reverse the cylindrical roller bearing ring 2 with a lower amplitude height to measure both sides, which is more time-saving and labor-saving.

[0019] See also Figure 2 and 3 , if the end face height H of cylindrical roller bearing ring 2 is greater than 200mm, measure the outer diameter of the cylindrical roller bearing ring close to end face A, and mark the maximum diameter point of end face A and the minimum diameter point N of end face A. A , get the diameter change S A ; Measure the outer diameter of the cylindrical roller bearing ring near the B end face, and mark the maximum and minimum diameter points of the B end face N. B , and the diameter variation S is obtained B ; Start step S200; As an example, see Figure 4 , specifically measure the change in the middle diameter S o And the diameter change S A , S B The specific method includes: using a measuring ruler 1 to rotate along the circumferential direction of the outer diameter of the cylindrical roller bearing ring 2, determining the low point and high point of the ring by the number of revolutions of the pointer of the dial indicator, and then determining the change amount S of the intermediate diameter o And the diameter change S A , S BAs an example, the measuring pipe ruler 1 includes a pipe ruler body 100, an abutment assembly 200 slidably fixed to the pipe ruler body 100, and a measuring gauge assembly 300 slidably fixed to the pipe ruler body. It should be noted that the measurement of the intermediate diameter variation S o When the pointer points to the outer diameter at the middle position between the A end face and the B end face of the cylindrical roller bearing ring 2, the diameter change S is measured. A , S B When the pointer is at the outer diameter of the cylindrical roller bearing ring 2 close to the A end face and the B end face respectively.

[0020] Step S200: If the diameter variation S A , diameter variation S B If both are greater than the standard deformation threshold, step S300 is started; it should be noted that the standard deformation threshold is determined according to the national standard JB / T1255-2014 version, or is specified based on the national standard. Fig. 9 , shows the table of allowable variation of the outer diameter of the ferrule in this embodiment. The unit of the nominal outer diameter is mm.

[0021] Step S300: Compare the minimum diameter point N of the end face A close to the end face A A The minimum diameter point of the B end face close to the B end face is N B , determine whether the projections of the two on the axial direction coincide; like Figure 2 and Figure 5 As shown, if they coincide, then the minimum diameter point of end face A is N A The minimum diameter point of the B end face is N B A top-type tooling 3 is installed at the midpoint O between the two axes to support and shape the axis so that the short axis can be deformed into the long axis. like Figure 4 and Figure 6 As shown in FIG. 1 , if they do not overlap, it is necessary to push up the cylindrical roller bearing ring 2 on both the side close to the A end face and the side close to the B end face at the same time. Specifically, the minimum point N of the A end face diameter on the inner diameter of the cylindrical roller bearing ring close to the A end face A The first top-forming tooling 4 is installed at the corresponding position to support and shape the short axis so that the short axis is deformed into the long axis; the minimum diameter point of the B end face is N on the inner diameter of the cylindrical roller bearing ring close to the B end face B A second top-molding tool 5 is installed at the corresponding position to support and shape the short axis so that the short axis is deformed into the long axis; See also Figure 7 , if the diameter change S A is greater than 1.5 times the standard deformation threshold, and S BIf the value is less than or equal to the standard deformation threshold, then step S400 is started, and both sides are pushed up in parallel; step S400, the minimum diameter point N of the A end face on the inner diameter of the cylindrical roller bearing ring 2 close to the A end face A The first top-forming tooling 4 is installed at the corresponding position to support and shape the short axis so that the short axis is deformed into the long axis; the second top-forming tooling 5 is installed at the position corresponding to the minimum point of the diameter of the B end face on the inner diameter of the cylindrical roller bearing ring near the B end face to limit the deformation of one side of the B end face from occurring along with the shaping of the other side; it should be noted that in this embodiment, the second top-forming tooling 5 is not adjusted, that is, the top-forming operation is not performed, and it is only to prevent that when the first top-forming tooling 4 performs the top-forming operation, the side of the cylindrical roller bearing ring near the B end face is affected by secondary deformation, which causes it to deviate from the standard deformation threshold. For example, the standard deformation threshold is 1.0mm, the side near the A end face is deformed by 3.0mm, and the side near the B end face is deformed by 0.6mm. At this time, although the side near the B end face is already less than the standard deformation threshold, it still needs to be smaller top-forming to prevent the other side from deforming and causing the deformation of the non-deformed side to exceed the standard requirements.

[0022] Start step S700; See also Figure 8 , if the diameter change S A Greater than the standard deformation threshold and less than or equal to 1.5 times the standard deformation threshold, S B is less than or equal to the standard deformation threshold, then start step S500; step S500, on the inner diameter of the cylindrical roller bearing ring close to the A end face, the A end face minimum diameter point N A Install the top molding tool 3 at the corresponding position to support and shape the short axis so that the short axis can be deformed into the long axis; Start step S700; See also Figure 5 , if the change in the middle diameter S o If the value is greater than the standard deformation threshold, step S600 is started; step S600, a top-forming tool 3 is installed at a position corresponding to the minimum point N0 of the intermediate diameter on the inner diameter of the cylindrical roller bearing ring 2, and the top-forming tool 3 is supported and shaped so that the short axis is deformed into the long axis; Start step S700; Step S700, shaping and tempering; in one embodiment, the tempering temperature of shaping and tempering in step S700 is 200°C~270°C, and the tempering time is 10h~15h. It should be noted that the shaped product must be tempered within 24 hours after the top is placed, and the tempering time of the pit furnace is more than 10 hours. The tempering time of the box tempering furnace is more than 5 hours. In this embodiment, the pit furnace tempering is adopted, and the tempering time is 10h~15h.

[0023] In one embodiment, when the diameter variation S A, diameter variation S B , Intermediate diameter variation S o If one of them exceeds the standard deformation threshold by 3 times, shaping is not allowed and the part will be directly scrapped.

[0024] Step S800, after the cylindrical roller bearing ring is air-cooled to room temperature, the top molding tool is removed and step S100 is repeated; If the diameter change S A , diameter variation S B If all are less than or equal to the standard deformation amount threshold, then start step S900; If the change in the middle diameter S o If it is less than or equal to the standard deformation amount threshold, then start step S900; Step S900: Perform secondary supplementary annealing to complete the shaping.

[0025] In one embodiment, the tempering temperature of the secondary supplementary tempering in step S900 is 200° C. to 270° C., and the tempering time is 10 h to 15 h.

[0026] In one embodiment, the top-type tooling 3 includes a screw top support; the first top-type tooling 4 includes a screw top support; and the second top-type tooling 5 includes a screw top support.

[0027] It should be noted that the standard deformation threshold S, i.e. the maximum diameter variation, is determined according to the type and size of the bearing to be processed, and can be determined according to the national standard in this field (JB / T1255-2014 version) or according to Fig. 9 The ring outer diameter allowed variation table provided in the table is read. In this embodiment, it is for large ultra-light narrow series cylindrical roller bearing rings with thin wall thickness (outer ring thickness 26mm, inner ring thickness 29.5mm) and large size (nominal outer diameter size 1250mm). Fig. 9 , the standard deformation threshold is 1.68mm. That is to say, if the diameter change S on only one side A Greater than 1.68mm or diameter variation S on both sides A , diameter variation S B If both are greater than 1.68 mm, they all need to proceed to the next step of installing the top tooling 3 and tempering. However, the positions of the top tooling 3 are different in different states, such as the diameter change S on both sides. A , diameter variation S B If both are less than 1.68 mm, no subsequent steps are required.

[0028] Step S500 and step S600, the rule for making the short axis reversely deformed into the long axis is to adjust the length of the top mold tooling 3 or the first top mold tooling 4 to a certain value so that the diameter change after shaping is equal to the martensite shaping reverse deformation amount or the bainite shaping reverse deformation amount. In one embodiment, when the top mold tooling 3, the first top mold tooling 4 and the second top mold tooling 5 are supported by screws. Rotate the nut on the top mold tooling 3, the first top mold tooling 4 or the second top mold tooling 5. Among them, the calculation formula for the martensite shaping reverse deformation amount is Y=(1.0~2.5)X+(0.0~0.5mm), where X is the original deformation amount, and Y is the diameter change amount after top shaping; the calculation formula for the bainite shaping reverse deformation amount is Y=(0.5~2.5)X+(0.0~0.5mm), where X is the original deformation amount, and Y is the diameter change amount after top shaping.

[0029] Further, see Figure 5 , Figure 6 , Figure 7 and Figure 8 , use the top tooling 3 to support the point to be shaped, and then rotate the nut on the top tooling 3 to lengthen the top tooling 3 to achieve the shaping effect. During shaping, the calculation formula for the reverse deformation of martensite shaping or the calculation formula for the reverse deformation of calcite shaping is used. The diameter change corresponding to the point to be shaped is X. Adjust the top tooling 3 so that the diameter change corresponding to the point to be shaped reaches Y, and stop adjusting. It is necessary to satisfy Y=1.5X+0.1mm. For example, the diameter change corresponding to the point to be shaped is X =1mm. The top tooling 3 supports the point to be shaped. The diameter change Y=1mmx1.5+0.1mm=1.68mm, and the top support ends. In specific operations, the range of the diameter change Y after top shaping can be calculated according to the top formula. When the diameter change Y measured after top shaping falls within the range, it is considered that the outer diameter deformation low point becomes the outer diameter deformation high point through the tooling force, and the top support ends, otherwise continue to adjust the top tooling 3.

[0030] The above-mentioned cylindrical roller bearing ring shaping process first distinguishes according to the amplitude height of the cylindrical roller bearing ring 2. For the cylindrical roller bearing ring 2 with an amplitude height H≤200mm, only the middle position needs to be measured, which reduces the workload caused by flipping and measuring both sides of such cylindrical roller bearing ring 2. For the cylindrical roller bearing ring 2 with an amplitude height H>200mm, the diameter change on both sides is measured at the same time, and the accurate minimum diameter position is found according to different measurement results, and the shaping position is strictly controlled. In addition, through two temperings, the internal structure of the bearing ring parts can be effectively stabilized, the internal stress can be reduced, and the bearing parts with stable dimensions can be obtained. That is, by controlling the shaping position and tempering temperature, a large reshaping amount and a high tempering temperature are used to ensure that the diameter change after shaping is within the tolerance range.

[0031] See also Fig. 9 It should be noted that the light, medium and heavy series of bearings are represented by the third digit from the right of the basic code. The light, medium and heavy series of bearings are distinguished by the diameter series of the bearings. The diameter series refers to the series of changes in the outer diameter and width of bearings with the same structure and the same inner diameter. For radial bearings and radial thrust bearings, 0 and 1 represent the extra light series, 2 represents the light series, 3 represents the medium series, and 4 represents the heavy series. Different types of bearings in this field also have their own specific methods of representing light, medium and heavy series. For example, except for the use of 1 to represent the extra light series, the rest of the thrust bearings are consistent with the radial bearings.

[0032] See also Fig.10 In Example 1, a shaping process for a large cylindrical roller bearing ring is provided. The ring is made of high carbon chromium bearing steel with bainite structure. According to the diameter size and the bearing type, the standard deformation threshold is determined to be 1.56 mm, the amplitude height is 250 mm, and the value is greater than 200 mm. The outer diameter of the cylindrical roller bearing ring close to the A end face is measured, and the maximum diameter point of the A end face and the minimum diameter point of the A end face are marked. A , and the diameter variation is 2.5 mm; Measure the outer diameter of the cylindrical roller bearing ring near the B end face, and mark the maximum and minimum diameter points of the B end face N. B , and the diameter variation is 2.3 mm; Start step S200; Step S200: If the deformation values ​​of the end surface A and the end surface B are both greater than the standard deformation value threshold, then step S300 is started; Step S300: Compare the minimum diameter point N of the end face A close to the end face A A The minimum diameter point of the B end face close to the B end face is N B , determine that the projections of the two coincide in the axial direction; then install the top-molding tooling at the midpoint between the minimum diameter point of the A end face and the minimum diameter point of the B end face, and support and shape it so that the short axis is deformed back into the long axis; The diameter change Y on one side of the A end face after the top support is 3.6mm, Y=top profile ratio 1.44*2.5mm=3.6mm; The diameter change Y on one side of the B end face after the support is also 3.6mm, Y=top shape ratio 1.56*2.3mm=3.6mm.

[0033] After tempering, the diameter change on one side of the A end face is 0.9 mm; the diameter change on one side of the B end face is 0.6 mm, both of which are less than the standard deformation threshold of 1.56 mm.

[0034] See also Fig.10In Example 2, a shaping process for a large cylindrical roller bearing ring is provided. The ring is made of high carbon chromium bearing steel with a martensitic structure. According to the diameter size and the bearing type, the standard deformation threshold is determined to be 1.24 mm, the amplitude height is 210 mm, and the value is greater than 200 mm. The outer diameter of the cylindrical roller bearing ring close to the A end face is measured, and the maximum diameter point of the A end face and the minimum diameter point of the A end face are marked. A , and the diameter variation is 3mm; Measure the outer diameter of the cylindrical roller bearing ring near the B end face, and mark the maximum and minimum diameter points of the B end face N. B , and the diameter variation is 2.7 mm; Start step S200; Step S200: If the deformation values ​​of the end surface A and the end surface B are both greater than the standard deformation value threshold, then step S300 is started; Step S300: Compare the minimum diameter point N of the end face A close to the end face A A The minimum diameter point of the B end face close to the B end face is N B , determine that the projections of the two coincide in the axial direction; then install the top-molding tooling at the midpoint between the minimum diameter point of the A end face and the minimum diameter point of the B end face, and support and shape it so that the short axis is deformed back into the long axis; The diameter change Y on one side of the A end face after the top support is 5.8mm, Y=top profile ratio 1.93*3mm =5.8mm; The diameter change Y on one side of the B end face after shaping is 5.8mm, Y=top type ratio 2.15*2.7mm=5.8mm.

[0035] After tempering, the diameter change on one side of the A end face is 0.8 mm; the diameter change on one side of the B end face is 0.7 mm, both of which are less than the standard deformation threshold of 1.24 mm.

[0036] See also Fig.10 In Example 3, a shaping process for a large cylindrical roller bearing ring is provided. The ring is made of high carbon chromium bearing steel with bainite structure. According to the diameter size and the bearing type, the standard deformation threshold is determined to be 1.56 mm, the amplitude height is 250 mm, and the value is greater than 200 mm. The outer diameter of the cylindrical roller bearing ring close to the A end face is measured, and the maximum diameter point of the A end face and the minimum diameter point of the A end face are marked. A , and the diameter variation is 2.9 mm; Measure the outer diameter of the cylindrical roller bearing ring near the B end face, and mark the maximum and minimum diameter points of the B end face N. B , and the diameter variation is 0.8 mm; If the diameter variation on one side of the A end surface is greater than 1.5 times the standard deformation amount threshold, and the diameter variation on one side of the B end surface is less than or equal to the standard deformation amount threshold, then S400 is started; Step S400, installing a first molding tool at a position corresponding to the minimum diameter point of the A end face on the inner diameter of the cylindrical roller bearing ring close to the A end face, and supporting and shaping the same so that the short axis is deformed into the long axis; The diameter change Y on one side of the A end face after the top support is 4.3mm, Y=top profile ratio 1.48*2.9mm=4.3mm; A second top-molding tool is installed at a position corresponding to the minimum point of the diameter of the B end face on the inner diameter of the cylindrical roller bearing ring close to the B end face, so as to limit the deformation of one side of the B end face as the other side is shaped; Start S700, shaping and tempering.

[0037] After tempering, the diameter change on one side of the A end face is 0.9 mm; the diameter change on one side of the B end face is 0.7 mm, both of which are less than the standard deformation threshold of 1.56 mm.

[0038] See also Fig.10 In Example 4, a shaping process for a large cylindrical roller bearing ring is provided. The ring is a high carbon chromium bearing steel with a martensitic structure and a diameter of 1000 mm. According to the diameter and the bearing type, the standard deformation threshold is determined to be 1.24 mm, the amplitude height is 210 mm, and the value is greater than 200 mm. The outer diameter of the cylindrical roller bearing ring near the A end face is measured, and the maximum diameter point of the A end face and the minimum diameter point of the A end face are marked. A , and the diameter variation is 2.5 mm; Measure the outer diameter of the cylindrical roller bearing ring near the B end face, and mark the maximum and minimum diameter points of the B end face N. B , and the diameter change is 0.8mm; If the diameter variation on one side of the A end surface is greater than 1.5 times the standard deformation amount threshold, and the diameter variation on one side of the B end surface is less than or equal to the standard deformation amount threshold, then S400 is started; Step S400, installing a first molding tool at a position corresponding to the minimum diameter point of the A end face on the inner diameter of the cylindrical roller bearing ring close to the A end face, and supporting and shaping the same so that the short axis is deformed into the long axis; The diameter change Y on one side of the A end face after the top support is 5mm, Y=top profile ratio 2*2.5mm=5mm; A second top-molding tool is installed at a position corresponding to the minimum point of the diameter of the B end face on the inner diameter of the cylindrical roller bearing ring close to the B end face, so as to limit the deformation of one side of the B end face as the other side is shaped; Start S700, shaping and tempering.

[0039] After tempering, the diameter change on one side of the A end face is 0.8 mm; the diameter change on one side of the B end face is 0.7 mm, both of which are less than the standard deformation threshold of 1.24 mm.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0042] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In the present invention, unless otherwise clearly specified and limited, the first feature "above" or "below" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature may be that the first feature is directly above or obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature may be that the first feature is directly below or obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature. It should be noted that when an element is referred to as "fixed to" or "set on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

Claims

1. A cylindrical roller bearing ring shaping process, wherein the cylindrical roller bearing ring has an A end face and a B end face, characterized in that: The specific steps include S100、 For example, the height of the cylindrical roller bearing ring is H≤200mm. Measure the outer diameter at the middle position between end face A and end face B, mark the maximum and minimum points of the middle diameter, and obtain the middle diameter variation S o ; If the end face height H of the cylindrical roller bearing ring is greater than 200 mm, Measure the outer diameter of the cylindrical roller bearing ring near the A end face, and mark the maximum and minimum diameter points of the A end face to obtain the diameter variation S A ; Measure the outer diameter of the cylindrical roller bearing ring near the B end face, and mark the maximum and minimum diameter points of the B end face to obtain the diameter variation S. B ; Start S200; S200、 If S A , S B If both are greater than the standard deformation threshold, S300 is started; If S A is greater than 1.5 times the standard deformation threshold, and S B is less than or equal to the standard deformation amount threshold, then starting S400; If S A Greater than the standard deformation threshold and less than or equal to 1.5 times the standard deformation threshold, S B is less than or equal to the standard deformation amount threshold, then starting S500; If S A , S B If all are less than or equal to the standard deformation value threshold, then S900 is started; If S o If it is greater than the standard deformation threshold, S600 is started; If S o If it is less than or equal to the standard deformation amount threshold, then S900 is started; S300, comparing the minimum diameter point of the A end face close to the A end face with the minimum diameter point of the B end face close to the B end face to determine whether the projections of the two in the axial direction coincide with each other; If they coincide, install the top-molding tooling at the midpoint between the minimum diameter point of the A end face and the minimum diameter point of the B end face to support and reshape them so that the short axis is deformed into the long axis; If they do not overlap, Then, a first top-forming tool is installed at a position corresponding to the minimum point of the diameter of the A end face on the inner diameter of the cylindrical roller bearing ring close to the A end face, and the top-forming tool is supported and shaped so that the short axis is deformed into the long axis; A second top-forming tool is installed at a position corresponding to the minimum point of the diameter of the B end face on the inner diameter of the cylindrical roller bearing ring close to the B end face to support and shape the short axis so that the short axis is deformed into the long axis; S400, installing a first molding tool at a position corresponding to the minimum diameter point of the A end face on the inner diameter of the cylindrical roller bearing ring close to the A end face, and supporting and shaping the same so that the short axis is deformed into a long axis; A second top-molding tool is installed at a position corresponding to the minimum point of the diameter of the B end face on the inner diameter of the cylindrical roller bearing ring close to the B end face, so as to limit the deformation of one side of the B end face as the other side is shaped; Start S700; S500, installing a top-forming tool at a position corresponding to the minimum point of the diameter of the A end face on the inner diameter of the cylindrical roller bearing ring close to the A end face, and supporting and shaping the top-forming tool so that the short axis is deformed into the long axis; Start S700; S600, install a top-forming tool at a position corresponding to the minimum point of the intermediate diameter on the inner diameter of the cylindrical roller bearing ring, and support and shape it so that the short axis is deformed into the long axis; Start S700; S700, shaping and tempering; S800, after the cylindrical roller bearing ring is air-cooled to room temperature, the top molding tool is removed and S100 is repeated; S900, perform secondary supplementary annealing to complete the shaping.

2. A cylindrical roller bearing ring shaping process according to claim 1, characterized in that: Measuring the diameter variation of the outer diameter of the cylindrical roller bearing ring includes: using a measuring tube ruler to rotate along the circumferential direction of the cylindrical roller bearing ring, determining the low point and high point of the ring through the number of rotations of the pointer of the dial indicator, and determining the diameter variation.

3. A cylindrical roller bearing ring shaping process according to claim 2, characterized in that: The measuring ruler comprises a ruler body, an abutment assembly slidably fixed to the ruler body, and a measuring table assembly slidably fixed to the ruler body.

4. A cylindrical roller bearing ring shaping process according to any one of claims 1 to 3, characterized in that: The tempering temperature of the shaping tempering described in S700 is 200°C~270°C, and the tempering time is 10h~15h.

5. A cylindrical roller bearing ring shaping process according to any one of claims 1 to 3, characterized in that: The tempering temperature for the secondary supplementary tempering described in S900 is 200°C~270°C, and the tempering time is 10h~15h.

6. A cylindrical roller bearing ring shaping process according to any one of claims 1 to 3, characterized in that: The top-type tooling includes a screw top support; the first top-type tooling includes a screw top support; the second top-type tooling includes a screw top support.

7. A cylindrical roller bearing ring shaping process according to any one of claims 1 to 3, characterized in that: The rule for reverse deformation of the short axis into the long axis is to adjust the length of the top mold tooling or the first top mold tooling to a certain value so that the diameter change after shaping is equal to the martensite shaping reverse deformation amount or the bainite shaping reverse deformation amount.

8. A cylindrical roller bearing ring shaping process according to claim 7, characterized in that: The calculation formula for the reverse deformation of martensite shaping is (1.0~2.5)X+(0.0~0.5mm), where X is the original deformation.

9. A cylindrical roller bearing ring shaping process according to claim 7, characterized in that: The calculation formula for the reverse deformation of bainite shaping is (0.5~2.5)X+(0.0~0.5mm), where X is the original deformation.

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