CN113275610A - Three-jaw chuck and method for machining bearing inner ring with narrow overtravel slot by using same - Google Patents
Three-jaw chuck and method for machining bearing inner ring with narrow overtravel slot by using same Download PDFInfo
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- CN113275610A CN113275610A CN202110609134.3A CN202110609134A CN113275610A CN 113275610 A CN113275610 A CN 113275610A CN 202110609134 A CN202110609134 A CN 202110609134A CN 113275610 A CN113275610 A CN 113275610A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
- B23B31/02—Chucks
- B23B31/10—Chucks characterised by the retaining or gripping devices or their immediate operating means
- B23B31/103—Retention by pivotal elements, e.g. catches, pawls
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/003—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass bearings
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Abstract
A three-jaw chuck and a method for processing a bearing inner ring with a narrow overrun groove by using the same relate to a three-jaw chuck and a method for processing a central bevel gear transmission bearing inner ring with a narrow overrun groove by using the same, and aim to solve the problems that the size of the central bevel gear transmission bearing with a narrow overrun groove is not easy to control and the qualified rate is low. The outer surface clamping side of each jaw body of the three-jaw chuck is provided with fan-shaped jaws, all the fan-shaped jaws are combined to form a circular ring structure, and the center of the outer diameter of each fan-shaped jaw is provided with a U-shaped opening. The processing method comprises the steps of firstly, finely turning a first plane, an inner diameter and inner and outer chamfers of the first plane; secondly, finely turning a second plane, the inner diameter and the outer diameter and inner and outer chamfers of the second plane; thirdly, soft grinding a plane; fourthly, forming acute angles among the fine car roller path, the flanges and the flanges; fifthly, turning an overtravel groove; sixthly, heat treatment; seventhly, coarse grinding circulation; eighthly, fine grinding circulation; ninthly, final grinding circulation; tenthly, hard turning overtravel grooves; eleven, lapping the roller path; twelfth, cleaning and submitting; belongs to the field of bearing processing.
Description
Technical Field
The invention relates to a three-jaw chuck and a method for processing an inner ring of a roller bearing with a narrow overtravel slot by using the three-jaw chuck, in particular to a three-jaw chuck and a method for processing an inner ring of a central bevel gear transmission bearing with a narrow overtravel slot by using the three-jaw chuck. Belongs to the field of bearing processing.
Background
The cylindrical roller bearing has wide application, the processing technology of the roller path and the rolling body is mature, but the processing method of the overtravel groove with the flange ring has a place which needs to be researched and improved. The design of the size and the shape of the overtravel groove has great influence on the processing manufacturability of the overtravel groove and the quality of the ferrule. Secondly, for a narrow overtravel groove structure which is difficult to machine, the dimensional tolerance of the overtravel groove is one of the reasons of small clearance of a flange, running deflection of a roller, abnormal impact and sliding friction between the end surface of the roller and the flange in the working process of the bearing, so that shallow layer peeling is generated.
Taking a certain type of central bevel gear transmission bearing as an example, in order to reduce the removal amount of materials and improve the deformation resistance of a raceway, the intersection of the raceway of a bearing inner ring and a flange is designed into a narrow overrun groove structure, the axial width of the overrun groove is 0.4mm, the radial width is 0.3mm, the radial depth is 0.2mm, and the axial depth is only 0.1 mm. And the central bevel gear transmission bearing belongs to a thin-wall ultra-light structure, the wall thickness is only 2.25mm, and the diameter-thickness ratio is less than or equal to 0.045, so that the central bevel gear transmission bearing is easily influenced by clamping deformation and heat treatment deformation during processing, the manufacturability is poor, the quality stability of the overrun groove is poor, and the qualification rate is only 40%. Secondly, after the overtravel groove is machined, the size of the overtravel groove is influenced when the raceway and the flange are ground, if the overtravel groove deviates to the flange, the flange is easy to be left when the raceway is ground, and the straightness of a raceway bus is poor.
The existing central bevel gear transmission bearing has the following problems when a narrow overtravel slot is processed:
1. the overtravel groove is lathed before heat treatment, and for a narrow overtravel groove with the axial depth of less than 0.1mm and the axial width of less than 0.4mm, the thickness dispersion difference, the raceway dispersion difference, the plane dispersion difference, the clamping deformation and the heat treatment deformation of the lathed retaining edge influence the size of the overtravel groove. Therefore, the final finished product size requirement of the overtravel slot cannot be met.
2. The overtravel groove is machined before heat treatment, at present, a grooving cutter is adopted for machining, the circular arc of the tool nose of the grooving cutter is a parallel cutter with the tool nose of R0.2, the tool feed angle is 45 degrees, the influence of size dispersion and heat treatment deformation on the overtravel groove is considered, according to theoretical calculation, the axial and radial depth dimensions of the overtravel groove during machining are shallower than the limit dimensions, and the corresponding axial and radial widths are narrower. When the raceway is lapped, the overtravel groove is too narrow, the amplitude of the oilstone is small, the intersection point of the raceway and the overtravel groove is warped, the generatrix of the raceway is W-shaped, the straightness of the generatrix of the raceway is poor, and the lapping qualification rate is reduced.
Disclosure of Invention
The invention provides a three-jaw chuck and a method for processing a bearing inner ring with a narrow overtravel slot by using the same, aiming at solving the problems that the size of a central bevel gear transmission bearing with the narrow overtravel slot is not easy to control and the yield is low.
The technical scheme adopted by the invention is as follows:
the utility model provides a three-jaw chuck, the surface centre gripping side of every jack catch body on the three-jaw chuck body all processes has a fan-shaped jack catch, is a ring annular structure after all fan-shaped jack catches make up, the external diameter center department of every fan-shaped jack catch all processes has the U-shaped mouth.
A method for processing a bearing inner ring with a narrow overtravel slot comprises the following steps:
step one, finely turning a first plane, an inner diameter and inner and outer chamfers of the first plane;
respectively turning a first plane, an inner diameter and a first inner chamfer on the first plane of the bearing inner ring by a first tool on a lathe, and turning machining parameters: the cutting speed v1 is 160m/min, and the feed amount f1 is 0.2 mm/r; and finely turning a first outer chamfer on a first plane of the bearing inner ring by using a second cutter, wherein the finely turning parameters are as follows: the cutting speed v2 is 200m/min, and the feed amount f2 is 0.22 mm/r;
step two, finely turning a second plane, the inner diameter and the outer diameter and the inner chamfer and the outer chamfer of the second plane;
respectively fine turning a second plane, an inner diameter and an outer chamfer of a bearing inner ring and a second plane by a second cutter on a lathe, and fine turning machining parameters: the cutting speed v3 is 200m/min, and the feed amount f3 is 0.22 mm; and (3) finely turning a second inner chamfer on a second plane of the bearing inner ring by using a first tool, wherein the finely turning parameters are as follows: the cutting speed v4 is 160m/min, and the feed amount f4 is 0.2 mm/r;
step three, soft grinding a plane;
respectively and softly grinding a first plane and a second plane of the bearing inner ring on a grinding machine, wherein the grinding machine has the following processing parameters: the rotating speed n1 is 1000 r/min;
step four, turning the roller path, and forming acute angles between the flanges and the flanges;
and respectively turning acute angles of a raceway, a flange and a flange of the bearing inner ring by a third cutter on a lathe, wherein the turning parameters are as follows: the cutting speed v5 is 100m/min, and the feed amount f5 is 0.03 mm/r;
fifthly, turning an overtravel slot;
roughly turning an overtravel groove of the inner ring of the bearing on a lathe by adopting a fourth tool, and roughly turning processing parameters: the cutting speed v6 is 100m/min, and the feed amount f6 is 0.03 mm/r;
step six, heat treatment;
carrying out heat treatment on the bearing inner ring, wherein the hardness after the heat treatment is 60HRC-64 HRC;
step seven, coarse grinding circulation;
the method comprises the following steps of roughly grinding a first plane, a second plane, an inner diameter, an outer diameter, an inner diameter and an outer diameter of a bearing inner ring, a roller path and a flange on a grinding machine in sequence; after the coarse grinding is finished, performing supplementary tempering treatment on the bearing inner ring, and performing coarse grinding finish treatment on the bearing inner ring after supplementary tempering;
step eight, fine grinding circulation;
sequentially and finely grinding a first plane, a second plane, an inner diameter, an outer diameter and a raceway of the bearing inner ring on a grinding machine;
step nine, final grinding circulation;
the method comprises the following steps of (1) sequentially and finally grinding a first plane, a second plane, an inner diameter, an outer diameter, a raceway and a flange of a bearing inner ring on a grinding machine;
step ten, hard turning over the journey groove;
adopt on the lathe the three-jaw chuck body is fixed the bearing inner race, and the bearing inner race cover is established on all fan-shaped jack catchs, and the internal diameter of bearing inner race contacts with the sector face of all fan-shaped jack catchs, adopts the hard car groove of overtravel of fifth cutter, hard car processing parameter: the cutting speed v7 is 50m/min, and the feed amount f7 is 0.02 mm/r;
step eleven, finely grinding the roller path;
finely grinding a raceway of a bearing inner ring on a grinding bed;
step twelve, cleaning and submitting;
and cleaning the processed bearing inner ring, and uniformly collecting and managing the cleaned bearing inner ring, so that the processing of the bearing inner ring is completed.
Has the advantages that:
the method adds a soft grinding plane process after the turning and forming, compresses the tolerance of the first plane and the second plane to +/-0.01 mm, and the parallel error is less than or equal to 0.02mm, and changes the edge turning process from controlling the thickness and the distance of the edge of the second plane into controlling the thickness of the edge of the first plane and the second plane, thereby ensuring the consistency of the axial depth and the axial width of the overtravel groove of the first plane and the second plane.
After the finish grinding circulation, a hard turning overtravel groove procedure is added before the raceway is finely ground, the hard turning method adopts dry turning, namely cooling liquid is not used, the axial width and the radial width of the overtravel groove are increased by changing a cutter of the hard turning overtravel groove, when the raceway is finely ground, the problem that the straightness of a raceway bus is poor due to the fact that warping is easy to generate at the intersection point of the raceway and the overtravel groove is avoided, and the qualified rate of the roller bearing is improved.
According to the invention, the U-shaped opening is processed at the center of the outer diameter of the fan-shaped jaw of the three-jaw chuck, and the three-side contact between the three-jaw chuck and the central bevel gear transmission bearing is changed into six-side contact, so that the outer diameter surface of the fan-shaped jaw is better matched with the inner diameter surface of the central bevel gear transmission bearing, the action area of the clamping force of the three-jaw chuck is increased, the clamping force is uniformly distributed on the inner diameter surface of the central bevel gear transmission bearing in multiple points, and the clamping deformation of the inner diameter of the central bevel gear transmission bearing is effectively controlled.
Drawings
FIG. 1 is a front view of a three jaw chuck;
FIG. 2 is a side view of the jaws of the three-jaw chuck;
FIG. 3 is a schematic view of the inner ring after processing in step one;
FIG. 4 is a schematic view of the inner ring after step two machining;
FIG. 5 is a schematic view of the inner ring after step three machining;
FIG. 6 is a schematic view of the inner ring after step four machining;
FIG. 7 is a schematic view of the inner ring after step five machining;
FIG. 8 is a schematic view of the inner race after the tenth step;
FIG. 9 is an enlarged schematic view at A of FIG. 8;
FIG. 10 is a schematic view of the process of step five;
FIG. 11 is a schematic view of the "W" profile of the raceway bus;
FIG. 12 is a schematic view of the process of step ten;
Detailed Description
The first embodiment is as follows: the embodiment is described by combining fig. 1 and fig. 2, the three-jaw chuck comprises a three-jaw chuck body 1, one fan-shaped jaw 1-2 is processed on the outer surface clamping side of each jaw body 1-1 on the three-jaw chuck body 1, all the fan-shaped jaws 1-2 are combined to form a circular ring structure, a U-shaped opening 1-2-1 is processed at the center of the outer diameter of each fan-shaped jaw 1-2, the arrangement is such that the central bevel gear drive bearing is of a thin-wall structure, the wall thickness is only 2.25mm, when a hard turning overtravel groove is formed, the inner diameter of a part is the finished size, the subsequent processing is not performed, in order to ensure that the inner diameter surface cannot be deformed due to the clamping of the three-jaw chuck, and because the fan-shaped jaws 1-2 of the three-jaw chuck do not necessarily completely "fit with the inner diameter of the central bevel gear bearing when clamping the central bevel gear drive bearing, therefore, partial clamping surface point contact can be caused, roundness deformation is out of tolerance, three-side contact of the three-jaw chuck is changed into six-side contact, the outer diameter surface of the fan-shaped clamping jaw 1-2 is better matched with the inner diameter surface of the central bevel gear transmission bearing, the action area of the clamping force of the three-jaw chuck is increased, multiple points with uniform clamping force are distributed on the working surface, the clamping deformation of the thin-wall ferrule is controlled, the three-jaw chuck is used for clamping the central bevel gear transmission bearing when a hard-turning overrun groove is formed, the clamping surface of the central bevel gear transmission bearing is the inner diameter surface, the central bevel gear transmission bearing is sleeved on all fan-shaped clamping jaws 1-2 of the three-jaw chuck, fan-shaped clamping jaws 1-2 are adopted for generally processing thin-wall parts, the action area of the clamping force is increased, the clamping surface of the parts is increased, and deformation is not easy to generate. .
The second embodiment is as follows: referring to fig. 1, the embodiment is described, and the width of the U-shaped opening 1-2-1 is 9mm, and the arrangement is determined according to the inner diameter dimension of the product, so as to ensure that the chord length of each contact surface is about 15mm, which is not only but can be controlled to deform through tests, and the other steps are the same as those of the embodiment.
The third concrete implementation mode: the embodiment is described with reference to fig. 3 to 12, and the method for processing the bearing inner ring with the narrow overtravel groove in the embodiment comprises the following steps:
step one, finely turning the inner and outer chamfers of a first plane 2, an inner diameter 3 and the first plane 2;
respectively turning a first plane 2 and an inner diameter 3 of the inner ring of the bearing and a first inner chamfer 4 on the first plane 2 by a first tool on a lathe, and turning machining parameters: the cutting speed v1 is 160m/min, and the feed amount f1 is 0.2 mm/r; and finely turning a first outer chamfer 5 on the first plane 2 of the bearing inner ring by adopting a second cutter, wherein the finely turning parameters are as follows: the cutting speed v2 is 200m/min, and the feed amount f2 is 0.22 mm/r;
step two, finely turning a second plane 6, an inner diameter 7 and an outer chamfer of the second plane 6;
respectively fine turning a second plane 6, an inner diameter 7 and an outer chamfer 8 on the second plane 6 of the bearing inner ring by adopting a second cutter on a lathe, and fine turning machining parameters: the cutting speed v3 is 200m/min, and the feed amount f3 is 0.22 mm; and (3) finely turning a second inner chamfer 9 on a second plane 6 of the bearing inner ring by using a first tool, wherein the finely turning parameters are as follows: the cutting speed v4 is 160m/min, and the feed amount f4 is 0.2 mm/r;
step three, soft grinding a plane;
respectively and softly grinding a first plane 2 and a second plane 6 of the bearing inner ring on a grinding machine, wherein the grinding machine has the following processing parameters: the rotating speed n1 is 1000 r/min;
step four, carrying out fine turning on the roller path 10, the flange 11 and an acute angle 12 of the flange;
respectively turning a raceway 10, a flange 11 and an acute angle 12 of the flange of a bearing inner ring by a third cutter on a lathe, wherein the turning parameters are as follows: the cutting speed v5 is 100m/min, and the feed amount f5 is 0.03 mm/r; in the step of turning the retaining edge 11, the thickness of the retaining edge 11 of the second plane 6 and the distance between the retaining edges 11 are controlled instead of controlling the thickness of the retaining edges 11 of the first plane 2 and the second plane 6, so that the consistency of the axial depth and the axial width of the overtravel groove 13 of the first plane 2 and the second plane 6 is ensured.
Step five, turning an overtravel groove 13;
roughly turning an overtravel groove 13 of the bearing inner ring by adopting a fourth tool on a lathe, wherein roughly turning processing parameters are as follows: the cutting speed v6 is 100m/min, and the feed amount f6 is 0.03 mm/r; at the moment, the overtravel groove 13 is primarily turned once, and a foundation is laid for grinding the flange 11 and the roller path 10 after heat treatment.
Step six, heat treatment;
carrying out heat treatment on the bearing inner ring, wherein the hardness of the center bevel gear transmission bearing is 60HRC-64HRC as the center bevel gear transmission bearing is 8Cr4Mo4V which belongs to high-temperature steel;
step seven, coarse grinding circulation;
the method comprises the following steps of roughly grinding a first plane 2, a second plane 6, an inner diameter 3, an inner diameter 7, an outer diameter 7, a roller path 10 and a flange 11 of a bearing inner ring on a grinding machine in sequence; after the coarse grinding is finished, performing supplementary tempering treatment on the bearing inner ring, and performing coarse grinding finish treatment on the bearing inner ring after supplementary tempering;
step eight, fine grinding circulation;
a first plane 2, a second plane 6, an inner diameter 3, an inner diameter 7 and an outer diameter 7 of a bearing inner ring and a roller path 10 are finely ground on a grinding machine in sequence;
step nine, final grinding circulation;
a first plane 2, a second plane 6, an inner diameter 7, a raceway 10 and a flange 11 of a bearing inner ring are finally ground on a grinding machine in sequence;
step ten, hard turning over the journey groove 13;
fixing a bearing inner ring on the lathe by adopting the three-jaw chuck body 1, sleeving the bearing inner ring on all the fan-shaped clamping jaws 1-2, contacting the inner diameter 3 of the bearing inner ring with the fan-shaped surfaces of all the fan-shaped clamping jaws 1-2, and hard turning the overtravel groove 13 by adopting a fifth cutter to hard turn the machining parameters: the cutting speed v7 is 50m/min, and the feed amount f7 is 0.02 mm/r; the hard turning of the overrun groove 13 is performed by "dry turning", i.e., without using a coolant, in order to control the influence of heat treatment deformation and subsequent grinding allowance on the size of the overrun groove 13, and since the hard turning is a method of forming chips by annealing and softening the material of the sheared portion, if the coolant is poured, the effect due to the cutting force is reduced, thereby easily causing chipping of the insert.
Step eleven, finely grinding the raceway 10;
finely grinding a raceway 10 of a bearing inner ring on a grinding bed;
step twelve, cleaning and submitting;
and cleaning the processed bearing inner ring, and uniformly collecting and managing the cleaned bearing inner ring, so that the processing of the roller bearing is completed.
The fourth concrete implementation mode: this embodiment is explained with reference to fig. 3-12, and this embodiment describes a method for processing bearing inner race with narrow and small overtravel slot, first cutter includes C type blade and interior turning tool bar, C type blade and interior turning tool bar fixed connection, the second cutter includes C type blade and exterior turning tool bar, C type blade and exterior turning tool bar fixed connection, the third cutter includes 4mm wide flute blade and exterior turning tool bar, 4mm wide flute blade and exterior turning tool bar fixed connection, the fourth cutter includes R0.2 flute blade and 45 exterior turning tool bar, R0.2 flute blade and 45 exterior turning tool bar fixed connection, the fifth cutter includes inserted PCBN turning blade and exterior turning tool bar, and other and specific implementation modes of inserted PCBN turning blade and exterior turning tool bar fixed connection are the same.
The fifth concrete implementation mode: the method for processing the bearing inner ring with the narrow overtravel groove is described with reference to fig. 3-12, the tolerance of the first plane 2 and the second plane 6 of the bearing inner ring after the third step of soft grinding is +/-0.01 mm, the parallelism error is less than or equal to 0.02mm, and the rest is the same as that of the third or fourth embodiment.
The sixth specific implementation mode: the embodiment is described with reference to fig. 3 to 12, and the method for processing the bearing inner ring with the narrow and small overrun groove in the embodiment is described, the blade model of the fifth cutter in the step ten is WCB30 CCMW060204, the cutter bar size is 25 × 25mm, the blade included angle is 27 degrees, the blade main deflection angle is 46 degrees, the axial and radial widths of the overrun groove 13 can be increased on the basis of meeting the design requirement, when the raceway 10 is lapped, the problem that the straightness of the raceway bus is out of tolerance due to easy warping at the intersection point of the raceway 10 and the overrun groove 13 is avoided, and the rest are the same as those of the third, fourth or fifth specific embodiments.
The seventh embodiment: the embodiment is described with reference to fig. 3-12, and the method for processing the bearing inner ring with the narrow overtravel groove according to the embodiment is that after the step ten is completed, the roller bearing is sequentially subjected to acid cleaning, hydrogen removal, polishing of the baffle 11, final grinding of the inner diameter 3, fine grinding of the finish, fine grinding of the inner diameter 7 and flaw detection and grinding of the plane, and the rest is the same as that of the third, fourth, fifth or sixth embodiment.
Example (b):
a200-piece batch of central bevel gear transmission bearings with narrow overrun grooves 13 are selected, a numerically controlled lathe CY-K32 is adopted, the clamping force is adjusted to 0.2Mpa by using the three-jaw chuck, and a machining test is carried out according to calculated cutting parameters. And 4 coordinate sizes are all qualified through the size inspection of the overtravel groove 13. After the raceway is finely ground, the straightness of a raceway bus is checked, the straightness meets the design requirement that Li (+). ltoreq.1.5 um, and the detection data contrast is shown in table 1.
TABLE 1 Pre-and post-improvement data comparison
In conclusion, according to the test data in table 1, the new scheme can improve the machining stability of the central bevel gear transmission bearing with the narrow and small overrun grooves 13, can meet the design requirements, control the outflow of defective products, and can be popularized and applied to the machining of bearings with other narrow and small overrun grooves 13 structures.
Claims (7)
1. A three-jaw chuck, comprising a three-jaw chuck body (1), characterized in that: the outer surface clamping side of each jaw body (1-1) on the three-jaw chuck body (1) is provided with a fan-shaped jaw (1-2), all the fan-shaped jaws (1-2) are combined to form a circular ring structure, and the center of the outer diameter of each fan-shaped jaw (1-2) is provided with a U-shaped opening (1-2-1).
2. A three-jaw chuck according to claim 1, wherein: the width of the U-shaped opening (1-2-1) is 9 mm.
3. A method for processing a bearing inner ring with a narrow overtravel slot is characterized in that: it comprises the following steps:
step one, finely turning the inner chamfer and the outer chamfer of the first plane (2), the inner diameter (3) and the first plane (2);
adopting a first tool to respectively finish turning a first inner chamfer (4) on a first plane (2), an inner diameter (3) and a first plane (2) of a bearing inner ring on a lathe, and finishing turning machining parameters: the cutting speed v1 is 160m/min, and the feed amount f1 is 0.2 mm/r; adopting a second cutter to finish turning a first outer chamfer (5) on a first plane (2) of the bearing inner ring, and finishing turning machining parameters: the cutting speed v2 is 200m/min, and the feed amount f2 is 0.22 mm/r;
step two, finely turning the second plane (6), the inner diameter and the outer diameter (7) and the inner chamfer and the outer chamfer of the second plane (6);
adopting a second cutter to respectively finish turning a second outer chamfer (8) on a second plane (6), an inner diameter (7) and a second plane (6) of the bearing inner ring on the lathe, and finishing turning machining parameters: the cutting speed v3 is 200m/min, and the feed amount f3 is 0.22 mm; adopting a second inner chamfer (9) on a second plane (6) of the bearing inner ring of the first tool for fine turning, and fine turning machining parameters: the cutting speed v4 is 160m/min, and the feed amount f4 is 0.2 mm/r;
step three, soft grinding a plane;
the method comprises the following steps of respectively and softly grinding a first plane (2) and a second plane (6) of a bearing inner ring on a grinding machine, wherein the grinding machine has the following processing parameters: the rotating speed n1 is 1000 r/min;
step four, carrying out fine turning on the roller path (10), the flange (11) and an acute angle (12) of the flange;
adopting a third cutter to respectively finish turning a raceway (10) of a bearing inner ring, a flange (11) and an acute angle (12) of the flange on a lathe, wherein the finish turning parameters are as follows: the cutting speed v5 is 100m/min, and the feed amount f5 is 0.03 mm/r;
fifthly, turning an overtravel groove (13);
roughly turning an overtravel groove (13) of the inner ring of the bearing by adopting a fourth tool on a lathe, roughly turning processing parameters: the cutting speed v6 is 100m/min, and the feed amount f6 is 0.03 mm/r;
step six, heat treatment;
carrying out heat treatment on the bearing inner ring, wherein the hardness after the heat treatment is 60HRC-64 HRC;
step seven, coarse grinding circulation;
a first plane (2), a second plane (6), an inner diameter (3), an inner diameter (7), an outer diameter (10) and a flange (11) of a bearing inner ring are roughly ground on a grinding machine in sequence; after the coarse grinding is finished, performing supplementary tempering treatment on the bearing inner ring, and performing coarse grinding finish treatment on the bearing inner ring after supplementary tempering;
step eight, fine grinding circulation;
a first plane (2), a second plane (6), an inner diameter (3), an inner diameter (7) and an outer diameter (7) of the bearing inner ring and a roller path (10) are finely ground in sequence on a grinding machine;
step nine, final grinding circulation;
a first plane (2), a second plane (6), an inner diameter (7), a roller path (10) and a flange (11) of the bearing inner ring are finally ground on a grinding machine in sequence;
step ten, a hard vehicle overtravel groove (13);
adopt on the lathe three-jaw chuck body (1) is fixed the bearing inner race, and the bearing inner race cover is established on all fan-shaped jack catchs (1-2), and the sector contact of internal diameter (3) and all fan-shaped jack catchs (1-2) of bearing inner race adopts fifth cutter hard turning overtravel groove (13), hard turning machining parameter: the cutting speed v7 is 50m/min, and the feed amount f7 is 0.02 mm/r;
step eleven, finely grinding the raceway (10);
lapping a raceway (10) of a bearing inner ring on a grinding bed;
step twelve, cleaning and submitting;
and cleaning the processed bearing inner ring, and uniformly collecting and managing the cleaned bearing inner ring, so that the processing of the bearing inner ring is completed.
4. A method of machining an inner race of a bearing with a narrow overtravel slot as defined in claim 3 wherein: first cutter includes C type blade and interior turning tool bar, C type blade and interior turning tool bar fixed connection, the second cutter includes C type blade and excircle turning tool bar, C type blade and excircle turning tool bar fixed connection, the third cutter includes 4mm wide flute blade and excircle turning flute cutter arbor, 4mm wide flute blade and excircle turning flute cutter arbor fixed connection, the fourth cutter includes R0.2 groove blade and 45 excircle turning flute cutter arbor, R0.2 groove blade and 45 excircle turning flute cutter arbor fixed connection, the fifth cutter includes inserted PCBN turning blade and excircle turning cutter arbor, inserted PCBN turning blade and excircle turning tool bar fixed connection.
5. A method of machining an inner race of a bearing with a narrow overtravel slot as defined in claim 3 wherein: and step three, the tolerance of the first plane (2) and the second plane (6) of the bearing inner ring after the plane is softly ground is +/-0.01 mm, and the parallel error is less than or equal to 0.02 mm.
6. A method of machining an inner race of a bearing with a narrow overtravel slot as defined in claim 4 wherein: the tool bar size of the fifth tool in the step ten is 25 multiplied by 25mm, the included angle of the blade is 27 degrees, and the main deflection angle of the blade is 46 degrees.
7. A method of machining an inner race of a bearing with a narrow overtravel slot as defined in claim 3 wherein: after the step ten is finished, carrying out acid cleaning, dehydrogenation, polishing of the flange (11), final grinding of the inner diameter (3), fine grinding of the finish, fine grinding of the inner diameter (7) and the outer diameter (7), flaw detection and plane grinding on the bearing inner ring in sequence.
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Citations (9)
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