A low-carbon high-alloy steel bearing outer ring groove grinding method

Abstract

A kind of low-carbon high-alloy steel bearing outer ring raceway grinding processing method.It belongs to the field of bearing processing and manufacturing.Processing method: take sleeve ring;Coarse grinding raceway horizontal fulcrum;Coarse grinding raceway vertical fulcrum;Coarse grinding raceway eccentricity;Coarse grinding raceway speed;Coarse grinding raceway workpiece speed;Coarse grinding raceway grinding wheel dressing;Fine grinding raceway horizontal fulcrum;Fine grinding raceway vertical fulcrum;Fine grinding raceway eccentricity;Fine grinding raceway speed;Fine grinding raceway workpiece speed;Fine grinding cycle grinding wheel dressing;Final grinding raceway horizontal fulcrum;Final grinding raceway vertical fulcrum;Final grinding raceway eccentricity;Final grinding raceway grinding wheel rotation;Final grinding raceway workpiece speed;Final grinding raceway grinding wheel correction.The present application is mainly aimed at raceway surface reinforced steel bearing outer ring, solves the problem of 15Cr14Co12Mo5Ni2W type steel sleeve ring outer diameter surface scratch, improves sleeve ring grinding processing precision, ensures product quality stability.The present application is suitable for low-carbon high-alloy steel bearing outer ring raceway grinding processing.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of bearing manufacturing, and particularly relates to a bearing outer ring channel grinding processing method of low-carbon high-alloy steel. BACKGROUND

[0002] With the rapid development of aero-engines, the performance requirement of bearings is higher and higher, and the strength of bearing materials is gradually improved, so higher requirements are put forward for the grinding processing technology of corresponding materials. The 15Cr14Co12Mo5Ni2W steel aero-bearing part has high surface strength after carburizing due to material channel, and low surface strength of the outer diameter after non-carburizing. In the channel grinding process, the outer diameter surface is scratched due to supporting the outer diameter and grinding the channel, the size precision control ability of the channel grinding is poor, and the channel grinding quality is unstable. SUMMARY

[0003] The application aims at solving the above problems, and provides a bearing outer ring channel grinding processing method of low-carbon high-alloy steel.

[0004] A bearing outer ring channel grinding processing method of low-carbon high-alloy steel is realized by the following steps:

[0005] I. Taking a sleeve ring, which is a low-carbon high-alloy steel bearing outer ring, the sleeve ring channel surface is a reinforced material;

[0006] II. Coarse grinding channel horizontal support point: the horizontal support point head adopts a floating support point, the support point is in contact with the outer surface of the sleeve ring, the support point points to the rotation center of the sleeve ring, and is ±0-15° to the horizontal line;

[0007] III. Coarse grinding channel vertical support point: the vertical support point head adopts a fixed support point, the support point is in contact with the outer surface of the sleeve ring, the support point points to the rotation center of the sleeve ring, and is 0-30° to the left or right side of the vertical line;

[0008] IV. Coarse grinding channel eccentricity: taking the coarse grinding wheel rotation center as the origin, the sleeve ring mass center is on the right or left upper side of the coarse grinding wheel rotation center, and is 60-90° to the horizontal line, the eccentricity is less than or equal to 0.5mm;

[0009] V. Coarse grinding channel grinding wheel rotating speed: the coarse grinding wheel rotating speed is 3000-5000r / min, the granularity is 40-80 meshes, and the linear speed is 20-26m / s;

[0010] VI. Coarse grinding channel workpiece rotating speed: the workpiece rotating speed is 200-600r / min, and the workpiece linear speed is 3-7m / s;

[0011] VII. Coarse grinding channel grinding wheel dressing: a diamond pen is used to dress the grinding wheel, and the cutting depth is less than or equal to 0.15mm each time;

[0012] Eight, fine grinding channel horizontal fulcrum: horizontal fulcrum head adopts floating fulcrum, the fulcrum contacts with the outer surface of the sleeve ring, the fulcrum points to the rotation center of the sleeve ring, and is ±0-10° with horizontal line;

[0013] Nine, fine grinding channel vertical fulcrum: vertical fulcrum head adopts fixed fulcrum, the fulcrum contacts with the outer surface of the sleeve ring, the fulcrum points to the rotation center of the sleeve ring, and is 0-20° with vertical line left or right side;

[0014] Ten, fine grinding channel eccentricity: taking the rotation center of fine grinding wheel as the origin, the mass center of the sleeve ring is on the right or left upper side of the rotation center of the fine grinding wheel, and is 70-90° with horizontal line, the eccentric distance is less than or equal to 0.3mm;

[0015] Eleven, fine grinding channel grinding wheel speed: the fine grinding wheel speed is 4000-7000r / min, the granularity is 80-120 mesh, and the linear speed is 20-26m / s;

[0016] Twelve, fine grinding channel workpiece speed: the workpiece speed is 300-600r / min, and the workpiece linear speed is 5-9m / s;

[0017] Thirteen, fine grinding cycle grinding wheel dressing: the grinding wheel is dressed by diamond pen, and the cutting depth is less than or equal to 0.05mm each time;

[0018] Fourteen, final grinding channel horizontal fulcrum: horizontal fulcrum head adopts floating fulcrum, the fulcrum contacts with the outer surface of the sleeve ring, the fulcrum points to the rotation center of the sleeve ring, and is ±0-5° with horizontal line;

[0019] Fifteen, final grinding channel vertical fulcrum: vertical fulcrum head adopts fixed fulcrum, the fulcrum contacts with the outer surface of the sleeve ring, the fulcrum points to the rotation center of the sleeve ring, and is 0-10° with vertical line left or right side;

[0020] Sixteen, final grinding channel eccentricity: taking the rotation center of final grinding wheel as the origin, the mass center of the sleeve ring is on the right or left upper side of the rotation center of the fine grinding wheel, and is 70-90° with horizontal line, the eccentric distance is less than or equal to 0.2mm;

[0021] Seventeen, final grinding channel grinding wheel speed: the final grinding wheel speed is 6000-10000r / min, the granularity is 100-150 mesh, and the linear speed is 24-32m / s;

[0022] Eighteen, final grinding channel workpiece speed: the workpiece speed is 300-600r / min, and the workpiece linear speed is 6-12m / s;

[0023] Nineteen, final grinding channel grinding wheel dressing: the grinding wheel is dressed by diamond pen, and the cutting depth is less than or equal to 0.025mm each time; that is, the processing method is completed.

[0024] Further, the surface hardness of the channel of the ferrule in step one is 58-68HRC after surface strengthening, and the surface hardness of the outer diameter is 34-56HRC without strengthening.

[0025] Further, when the cutting depth is less than or equal to 0.05mm in step seven, no intermediate trimming is needed; when the cutting depth is greater than 0.05mm and less than or equal to 0.1mm, one intermediate trimming is taken; and when the cutting depth is less than or equal to 0.15mm, two trimmings are taken.

[0026] Further, when the cutting depth is less than or equal to 0.025mm in step thirteen, no intermediate trimming is needed; when the cutting depth is greater than 0.025mm and less than or equal to 0.05mm, one intermediate trimming is taken.

[0027] Further, when the cutting depth is less than or equal to 0.015mm in step nineteen, no intermediate trimming is needed; when the cutting depth is greater than 0.015mm and less than or equal to 0.025mm, one intermediate trimming is taken.

[0028] The bearing outer ring channel grinding processing method of low-carbon high-alloy steel in the application mainly aims at the channel surface strengthened steel bearing outer ring, solves the problem of scratches on the outer diameter surface of the 15Cr14Co12Mo5Ni2 steel ferrule, improves the grinding processing precision of the ferrule, and ensures the stability of product quality.

[0029] The 15Cr14Co12Mo5Ni2 material bearing outer ring processed by the grinding processing method in the application has no burn on the surface and no scratches on the outer diameter of the ferrule, and the channel grinding processing precision and surface quality meet the process requirements, and can be applied to other types of carburizing bearing ferrule processing.

[0030] The application is suitable for channel grinding processing of low-carbon high-alloy steel bearing outer ring. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is the physical map obtained after the channel of the 15Cr14Co12Mo5Ni2 material bearing outer ring is ground in the embodiment;

[0032] Figure 2 It is the data map of the measured value of the roundness of the channel of the 15Cr14Co12Mo5Ni2 material bearing outer ring in the embodiment;

[0033] Figure 3 It is the data map of the measured value of the roundness of the channel of the 15Cr14Co12Mo5Ni2 material bearing outer ring in the embodiment;

[0034] Figure 4 It is the data map of the measured value of the roundness of the channel of the 15Cr14Co12Mo5Ni2 material bearing outer ring in the embodiment;

[0035] Figure 5 Figure for measured data of the bearing outer ring raceway roundness of the 15Cr14Co12Mo5Ni2 material in the examples. DETAILED DESCRIPTION

[0036] The technical solution of the present application is not limited to the following specific embodiments, but also includes any combination of the specific embodiments.

[0037] Specific embodiment one: a low-carbon high-alloy steel bearing outer ring raceway grinding method, which is realized according to the following steps:

[0038] I. Take the sleeve ring, which is a low-carbon high-alloy steel bearing outer ring, and the sleeve ring raceway surface is a reinforced material;

[0039] II. Coarse grinding raceway horizontal support point: the horizontal support point head adopts a floating support point, the support point is in contact with the outer surface of the sleeve ring, the support point points to the rotation center of the sleeve ring, and is ±0-15° to the horizontal line;

[0040] III. Coarse grinding raceway vertical support point: the vertical support point head adopts a fixed support point, the support point is in contact with the outer surface of the sleeve ring, the support point points to the rotation center of the sleeve ring, and is 0-30° to the left or right side of the vertical line;

[0041] IV. Coarse grinding raceway eccentricity: taking the coarse grinding wheel rotation center as the origin, the sleeve ring mass center is on the right or left upper side of the coarse grinding wheel rotation center, and is 60-90° to the horizontal line, the eccentricity is less than or equal to 0.5mm;

[0042] V. Coarse grinding raceway wheel speed: the coarse grinding wheel speed is 3000-5000r / min, the particle size is 40-80 mesh, and the linear speed is 20-26m / s;

[0043] VI. Coarse grinding raceway workpiece speed: the workpiece speed is 200-600r / min, and the workpiece linear speed is 3-7m / s;

[0044] VII. Coarse grinding raceway wheel dressing: the diamond pen is used to dress the grinding wheel, and the cutting depth is less than or equal to 0.15mm each time;

[0045] VIII. Fine grinding raceway horizontal support point: the horizontal support point head adopts a floating support point, the support point is in contact with the outer surface of the sleeve ring, the support point points to the rotation center of the sleeve ring, and is ±0-10° to the horizontal line;

[0046] IX. Fine grinding raceway vertical support point: the vertical support point head adopts a fixed support point, the support point is in contact with the outer surface of the sleeve ring, the support point points to the rotation center of the sleeve ring, and is 0-20° to the left or right side of the vertical line;

[0047] Ten, fine grinding channel eccentricity: the fine grinding wheel rotation center as the origin, the ring mass center in the fine grinding wheel rotation center right or left upper side, with the horizontal 70-90°, eccentric distance less than or equal to 0.3mm;

[0048] Eleven, fine grinding channel grinding wheel speed: fine grinding wheel speed is 4000-7000r / min, particle size is 80-120 mesh, linear velocity is 20-26m / s;

[0049] Twelve, fine grinding channel workpiece speed: workpiece speed is 300-600r / min, workpiece linear velocity is 5-9m / s;

[0050] Thirteen, fine grinding cycle grinding wheel dressing: using diamond pen dressing grinding wheel, each cutting depth is less than or equal to 0.05mm;

[0051] Fourteen, final grinding channel horizontal support point: horizontal support point head adopts floating support point, support point with ring outer surface contact, support point pointing to ring rotation center, with the horizontal ±0-5°;

[0052] Fifteen, final grinding channel vertical support point: vertical support point head adopts fixed support point, support point with ring outer surface contact, support point pointing to ring rotation center, with the vertical left or right side 0-10°;

[0053] Sixteen, final grinding channel eccentricity: the final grinding wheel rotation center as the origin, the ring mass center in the fine grinding wheel rotation center right or left upper side, with the horizontal 70-90°, eccentric distance less than or equal to 0.2mm;

[0054] Seventeen, final grinding channel grinding wheel speed: final grinding wheel speed is 6000-10000r / min, particle size is 100-150 mesh, linear velocity is 24-32m / s;

[0055] Eighteen, final grinding channel workpiece speed: workpiece speed is 300-600r / min, workpiece linear velocity is 6-12m / s;

[0056] Nineteen, final grinding channel grinding wheel dressing: using diamond pen dressing grinding wheel, each cutting depth is less than or equal to 0.025mm; namely the completion of the processing method.

[0057] Specific implementation method two: the embodiment is different from specific implementation method one, and the surface hardness of the ring channel surface after surface strengthening in step one is 58-68HRC, and the surface hardness of the outer diameter which is not strengthened is 34-56HRC. The others are the same as specific implementation method one.

[0058] Specific implementation three: the embodiment is different from the specific implementation one, and when the cutting depth is less than or equal to 0.05 mm in step seven, intermediate dressing is not required; when the cutting depth is greater than 0.05 and less than or equal to 0.1 mm, intermediate dressing is taken once; and when the cutting depth is less than or equal to 0.15 mm, two times of dressing are taken. The others are the same as the specific implementation one.

[0059] Specific implementation four: the embodiment is different from the specific implementation one, and when the cutting depth is less than or equal to 0.025 mm in step thirteen, intermediate dressing is not required; when the cutting depth is greater than 0.025 and less than or equal to 0.05 mm, intermediate dressing is taken once. The others are the same as the specific implementation one.

[0060] Specific implementation five: the embodiment is different from the specific implementation one, and when the cutting depth is less than or equal to 0.015 mm in step nineteen, intermediate dressing is not required; when the cutting depth is greater than 0.015 and less than or equal to 0.025 mm, intermediate dressing is taken once. The others are the same as the specific implementation one.

[0061] The beneficial effects of the present application are verified through the following examples:

[0062] Example: taking a bearing outer ring of an engine as a machining object:

[0063] Combining Figures 1-5 ; a bearing outer ring groove grinding machining method of low-carbon high-alloy steel is realized according to the following steps:

[0064] I. Take the sleeve ring, which is a low-carbon high-alloy steel bearing outer ring, the sleeve ring groove surface is a reinforcing material 15Cr14Co12Mo5Ni2W;

[0065] II. Coarse grinding groove horizontal support point: the horizontal support point head adopts a floating support point, the support point is in contact with the outer surface of the sleeve ring, the support point points to the rotation center of the sleeve ring, and forms +12° with the horizontal line;

[0066] III. Coarse grinding groove vertical support point: the vertical support point head adopts a fixed support point, the support point is in contact with the outer surface of the sleeve ring, the support point points to the rotation center of the sleeve ring, and forms 25° with the left side of the vertical line;

[0067] IV. Coarse grinding groove eccentricity: taking the rotation center of the coarse grinding wheel as the origin, the mass center of the sleeve ring is on the right upper side of the rotation center of the coarse grinding wheel, forms 80° with the horizontal line, and the eccentricity is 0.4 mm;

[0068] V. Coarse grinding groove wheel speed: the coarse grinding wheel speed is 3500 r / min, the granularity is 60 meshes, and the linear speed is 22 m / s;

[0069] VI. Coarse grinding groove workpiece speed: the workpiece speed is 300 r / min, and the workpiece linear speed is 4 m / s;

[0070] Seven, coarse grinding channel sand wheel dressing: adopt diamond pen dressing sand wheel, each cutting depth is 0.1mm, intermediate dressing 1 times, cutting depth is 0.1mm;

[0071] Eight, fine grinding channel horizontal fulcrum: horizontal fulcrum head adopts floating fulcrum, the fulcrum is in contact with the outer surface of the sleeve ring, and the fulcrum is from the right side to the rotation center of the sleeve ring, and is +6° with the horizontal plane;

[0072] Nine, fine grinding channel vertical fulcrum: vertical fulcrum head adopts fixed fulcrum, the fulcrum is in contact with the outer surface of the sleeve ring, and the fulcrum is from the left side to the rotation center of the sleeve ring, and is 18° with the left side of the vertical line;

[0073] Ten, fine grinding channel eccentricity: taking the rotation center of the fine grinding wheel as the origin, the centroid of the sleeve ring is on the right side of the rotation center of the fine grinding wheel, and is 80° with the horizontal plane, and the eccentric distance is 0.3mm;

[0074] Eleven, fine grinding channel sand wheel speed: the fine grinding wheel speed is 6000r / min, the granularity is 120 mesh, and the linear speed is 24m / s;

[0075] Twelve, fine grinding channel workpiece speed: the workpiece speed is 350r / min, and the workpiece linear speed is 6m / s;

[0076] Thirteen, fine grinding cycle sand wheel dressing: adopt diamond pen dressing sand wheel, cutting depth is 0.025mm;

[0077] Fourteen, final grinding channel horizontal fulcrum: horizontal fulcrum head adopts floating fulcrum, the fulcrum is in contact with the outer surface of the sleeve ring, and the fulcrum is from the right side to the rotation center of the sleeve ring, and is +3° with the horizontal plane;

[0078] Fifteen, final grinding channel vertical fulcrum: vertical fulcrum head adopts fixed fulcrum, the fulcrum is in contact with the outer surface of the sleeve ring, and the fulcrum is directed to the rotation center of the sleeve ring, and is 8° with the left side of the vertical line;

[0079] Sixteen, final grinding channel eccentricity: taking the rotation center of the final grinding wheel as the origin, the centroid of the sleeve ring is on the right upper side of the rotation center of the fine grinding wheel, and is 85° with the horizontal plane, and the eccentric distance is 0.15mm;

[0080] Seventeen, final grinding channel sand wheel speed: the final grinding wheel speed is 7500r / min, the granularity is 120 mesh, and the linear speed is 28m / s;

[0081] Eighteen, final grinding channel workpiece speed: the workpiece speed is 450r / min, and the workpiece linear speed is 7m / s;

[0082] Nineteen, final grinding channel sand wheel correction: adopt diamond pen dressing sand wheel, intermediate dressing 1 times, cutting depth is 0.025mm;That is, the processing method is completed.

[0083] In step one of this embodiment, the surface hardness of the groove surface of the collar after strengthening is 62.5 HRC, and the surface hardness of the unstrengthened outer diameter is 51 HRC.

[0084] The method described in this embodiment is used to grind the outer ring raceway of a bearing made of 15Cr14Co12Mo5Ni2 material. Figures 1-5 As shown, ( Figure 1 This is a picture of the actual product. Figures 2-5 (The measured value is the outer ring groove roundness). It can be seen that after the final grinding of the groove, the standard requirement for the roundness of the ring groove is 1.5μm, and the measured value is 0.48~0.79μm. There are no burns on the surface and no scratches on the outer diameter of the ring. It can be seen that the method in this embodiment improves the grinding accuracy of the ring and ensures the stability of product quality. Its accuracy and surface quality meet the process requirements.

[0085] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A method of grinding a raceway of a bearing outer ring made of a low-carbon high-alloy steel, characterized in that It is implemented in the following steps: I, take the ring, it is low carbon high alloy steel bearing outer ring, ring channel surface is reinforced material, and it is processed in turn as follows; Two, rough grinding channel horizontal support point: horizontal support point head adopts floating support point, support point contacts with outer surface of ring, support point points to rotation center of ring, and forms ±0~15° with horizontal line; Three, rough grinding channel vertical support point: vertical support point head adopts fixed support point, support point contacts with outer surface of ring, support point points to rotation center of ring, and forms 0~30° with left or right side of vertical line; Four, rough grinding channel eccentricity: rough grinding wheel rotation center as origin, ring mass center is on right or left upper side of rough grinding wheel rotation center, and forms 60~90° with horizontal line, eccentric distance is less than or equal to 0.5mm; Five, rough grinding channel grinding wheel speed: rough grinding wheel speed is 3000~5000r / min, granularity is 40~80 mesh, linear velocity is 20~26m / s; Six, rough grinding channel workpiece speed: workpiece speed is 200~600r / min, workpiece linear velocity is 3~7m / s; Seven, rough grinding channel grinding wheel dressing: adopts diamond pen to dress grinding wheel, each cutting depth is less than or equal to 0.15mm; Eight, fine grinding channel horizontal support point: horizontal support point head adopts floating support point, support point contacts with outer surface of ring, support point points to rotation center of ring, and forms ±0~10° with horizontal line; Nine, fine grinding channel vertical support point: vertical support point head adopts fixed support point, support point contacts with outer surface of ring, support point points to rotation center of ring, and forms 0~20° with left or right side of vertical line; Ten, fine grinding channel eccentricity: fine grinding wheel rotation center as origin, ring mass center is on right or left upper side of fine grinding wheel rotation center, and forms 70~90° with horizontal line, eccentric distance is less than or equal to 0.3mm; Eleven, fine grinding channel grinding wheel speed: fine grinding wheel speed is 4000~7000r / min, granularity is 80~120 mesh, linear velocity is 20~26m / s; Twelve, fine grinding channel workpiece speed: workpiece speed is 300~600r / min, workpiece linear velocity is 5~9m / s; Thirteen, fine grinding cycle grinding wheel dressing: adopts diamond pen to dress grinding wheel, each cutting depth is less than or equal to 0.05mm; Fourteen, final grinding channel horizontal support point: horizontal support point head adopts floating support point, support point contacts with outer surface of ring, support point points to rotation center of ring, and forms ±0~5° with horizontal line; Fifteen, final grinding channel vertical support point: vertical support point head adopts fixed support point, support point contacts with outer surface of ring, support point points to rotation center of ring, and forms 0~10° with left or right side of vertical line; Sixteen, final grinding channel eccentricity: final grinding wheel rotation center as origin, ring mass center is on right or left upper side of fine grinding wheel rotation center, and forms 70~90° with horizontal line, eccentric distance is less than or equal to 0.2mm; Seventeen, final grinding channel grinding wheel speed: final grinding wheel speed is 6000~10000r / min, granularity is 100~150 mesh, linear velocity is 24~32m / s; Eighteen, final grinding channel workpiece speed: workpiece speed is 300~600r / min, workpiece linear velocity is 6~12m / s; Nineteen, the final grinding groove sand wheel correction: using diamond pen finishing sand wheel, each cutting depth is less than or equal to 0.025mm; That is, the completion of the processing method; The surface hardness of the groove of the ferrule in step one is 58-68HRC after surface strengthening, and the surface hardness of the outer diameter is 34-56HRC without strengthening; The groove surface of the ferrule in step one is a strengthened material 15Cr14Co12Mo5Ni2W; When the cutting depth is less than or equal to 0.05mm in step seven, no intermediate trimming is needed; When the cutting depth is greater than 0.05 and less than or equal to 0.1mm, intermediate trimming is taken once; When the cutting depth is less than or equal to 0.15mm, two trims are taken; When the cutting depth is less than or equal to 0.025mm in step thirteen, no intermediate trimming is needed; When the cutting depth is greater than 0.025 and less than or equal to 0.05mm, intermediate trimming is taken once; When the cutting depth is less than or equal to 0.015mm in step nineteen, no intermediate trimming is needed; When the cutting depth is greater than 0.015 and less than or equal to 0.025mm, intermediate trimming is taken once.

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