JP5254706B2 - Bearing grinding jig - Google Patents

Description

The present invention secures bearings such as angular ball bearings, rolling bearings, and four-point contact ball bearings having a plurality of rolling elements interposed between an outer ring and an inner ring to a bearing clamp flange, and an annular ring of the inner ring of this bearing The present invention relates to a bearing grinding jig to be used for grinding and flattening with a grinding wheel that rotates a plane.

Many methods for processing bearings have been proposed. For example, after heat-treating the outer ring material and performing surface hardening, both sides of the ring of the outer ring are width ground, then the rolling surface of the outer ring is centerless ground, and the inner seal groove of the outer ring is machined by quenching steel cutting. . Thereafter, the outer race is formed by superfinish polishing the rolling surface. Also, after heat treating the inner ring material and performing surface hardening, both sides of the ring of the inner ring are width ground, then the rolling surface of the inner ring is centerless ground, and the outer seal groove of the inner ring is machined by quenching steel cutting. . Thereafter, the inner race is formed by superfinish polishing the rolling surface. A rolling element is inserted into the raceway space between the inner ring and the outer ring, and then an annular seal is fitted into the seal groove of the inner ring to close the gap between the outer ring and the inner ring (see, for example, Patent Document 1).

An annular material with an outer diameter of the outer diameter of the bearing outer ring and the allowance, an inner diameter of the inner ring of the bearing minus the allowance, and a width of the bearing width plus the allowance. An annular material manufacturing process to be manufactured, a cutting process of cutting the annular material into a plurality of raceway ring materials by laser processing, and one of the cut raceway ring materials as an outer ring raceway, and the other one Is the inner ring raceway, and both the outer ring raceway and the inner ring raceway are simultaneously subjected to double-end surface grinding on the axial end faces of the outer ring raceway and the inner ring raceway, and the axial end faces of the outer ring raceway and the inner ring raceway are magnetized by a magnet chuck. However, a bearing race manufacturing method has been proposed which includes a turning process in which the outer diameter surface, the inner diameter surface and the groove are subjected to a hard turning process with one chuck (see, for example, Patent Document 2).

Further, a method of manufacturing a bearing ring of a combined bearing in which a plurality of bearing rings are combined, wherein the ring-shaped member is longer by a predetermined dimension than the axial length when the plurality of bearing rings are combined in the axial direction. After the required processing is performed on each race, the processing accuracy is inspected, and then the wire is cut while rotating the ring member to divide the ring member into a plurality of rings. A method of manufacturing a bearing ring for a combined bearing is also proposed, characterized in that a finished race ring is obtained by grinding the cut surface of the ring itself after machining and providing circumferential grooves on the inner diameter side and / or outer diameter side. (For example, see Patent Document 3).

Furthermore, a wheel for processing a rolling bearing device for a wheel comprising an outer ring, an inner ring, and a plurality of rolling elements, wherein the outer ring or the inner ring has a brake disk mounting flange for directly or indirectly mounting a brake disk. A rolling bearing device machining method comprising: assembling the outer ring, the inner ring, and the plurality of rolling elements; and then, setting the outer ring or the inner ring having the brake disk mounting flange in a circumferential direction at a predetermined position. While mounting non-rotatably, the inner ring or the outer ring not provided with the brake disk mounting flange applies a load toward the brake disk mounting flange and the inner ring or the outer ring without the brake disk mounting flange. The brake disc mounting flange brake while the outer ring is rotated. There has also been proposed a processing method for a wheel rolling bearing device for grinding a brake disk mounting surface by bringing a brake disk mounting surface to which a disk is mounted directly or indirectly into contact with a grindstone of a rotating grinding device. (For example, see Patent Document 4).

Although a bearing may be used independently, it is often used combining two bearings (DF combination or DB combination) (for example, refer patent document 4).

JP-A-6-246546 JP 2004-92726 A JP 2005-48881 A FIG. 3 of JP-A-2006-175551 FIG. 1 of Japanese Patent Laid-Open No. 2008-20002

When the DF combination bearing 200 having the structure disclosed in Patent Document 5 is used as a main shaft bearing of a precision machine tool, as shown in FIG. 3, the inner ring of the upper ball bearing 201 is used in order to increase machining dimensional accuracy. Work is performed after the DF combination bearing 200 has an annular bottom plane 201b that applies a preload to the inner ring annular upper plane 202a of the lower ball bearing 202 so that the peeling force between the upper bearing bottom surface and the lower bearing upper surface is about 200 kg (plus or minus 40 kg). Used for bearings for machine main shafts.

Therefore, a bearing of a DF arrangement (Face to Face arrange) obtained by double-side grinding the annular plane of the outer ring or the annular plane of the inner ring using the flat grindstone described in Patent Document 1, Patent Document 2 and Patent Document 3. Is a combination bearing, the smoothness of the annular plane of the outer ring or the inner ring is as coarse as 1 to 2 μm, which is less than the peeling force (about 160 kg).

The present inventors presume that the smoothness of the annular plane of the bearing ring can be improved to 0.2 to 0.5 μm by using a grinding wheel (including a molded grinding wheel). A bearing grinding jig that can apply sufficient back pressure to the back of the bearing has been developed.

The invention of claim 1 is a bearing grinding jig (1) provided on a base of a grinding apparatus, and the bearing grinding jig (1) is a top of a cylindrical jig housing material (3) . provided, slightly larger than the inner diameter of the upper guide ring tube (4a) is an outer ring _(w o) diameter of the bearing (w) is to be ground material, an inner diameter of bearings of the lower outer ring supporting an annular cylinder (4b) (w ) and the bearing case of slightly smaller two-stage annular tube structure than the outer diameter of (4), the upper guide ring of the bearing (w) the bearing case after the guided before SL bearing case (4) in (4) cylindrical outer race of the bearing to be fixed to the annular plane of (4a) (w) suppressed and (5), the lower outer supporting annular cylinder (4b) of the bearing which is guided on the inner ring of the bearing case (4) _{(w i} Clan fitted inner ring pressing member (17)) the bottom by pressure fixed And Pufuranji (14), said supplied to the clamp flange (14) and the piston (19) to receive retainer plate (22) pressurized air supply pipe (21), the pressurized air introduced into the pressure chamber (20) a clamping flange lifting means (14,17,19,21,22) for moving up and down, a hollow rotary shaft drive means for rotating (12) (25) and the bearing grinding jig comprising (1) The shaft center of the hollow rotating shaft (12), the shaft center of the rotating shaft (13), the shaft center of the bearing (w), and the shaft center of the clamp flange (14) are the same. A bearing grinding jig (1) is provided.

According to a second aspect of the invention, the clamping flange lifting means (14,17,19,21,22) includes an inner ring _(w i) the bottom is the inner ring pressing member for pressing the fixed link ball (17), the cross-sectional surface cylinder which is provided below the hat-shaped clamp flanged collar (14) (11) spline shaft within the (13) is provided, equipped with the link ball head of the spline shaft (13) (17), this causes abutting interdigitated in the bottom recess of the link ball (17) pre-Symbol clamping flange (14), retainer plate (22) and the upper open concave piston at the bottom outer periphery of the spline shaft (13) and (19) mating, provided the piston with interpolation of a coil spring (18) in a recessed space of the piston (19) (19) to the cylinder (11) within the piston (1 ) The receiving retainer plate (22) bottom and the cylinder (11) pressurized to a pressure ejection port for supplying pressurized air to the formed pressure chamber (20) between the bottom and provided at the bottom of the cylinder (11) of pressure provided air supply pipe (21) into said in idling shaft (12), the clamp by moving the ring ball (17) upwards by introducing pressurized air into the pressure chamber (20) characterized in that it is a clamping flange lifting means structure for contact with the inner ring (w _i) the bottom of the upper surface of the clamping flange by applying the bottom of the flange (14), Osamu bearing grinding according to claim 1, wherein A tool (1) is provided.

The bearing grinding jig of the present invention is configured such that an annular rubber ring for preventing foreign matter intrusion is fitted into a gap between an outer ring and an inner ring of a bearing in which a plurality of rolling elements are interposed between the outer ring and the inner ring, and this is used as a bearing grinding jig. The bearing is inserted into the bearing case, and then the outer ring restraint of the bearing is fixed to the annular upper plane of the upper guide annular cylinder of the bearing case to prevent the bearing, which is the material to be ground, from protruding upward. Next, the inner ring pressure member fixed to the clamp flange is lifted by the piston fixed to the outer periphery of the spline shaft by blowing the compressed air into the cylinder from the compressed air supply pipe facing the inner bottom of the cylinder. The inner ring bottom portion and outer ring upper portion of the bearing, which is the material to be ground, are held and fixed by the inner ring pressure member and the outer ring restraint of the bearing, and then the material to be ground is rotated by rotating the rotating shaft. The outer ring and the inner ring of the bearing can be flattened by performing a grinding process that cuts the circumferential surface of the grinding wheel rotating on the annular plane of the outer ring and the annular plane of the inner ring while rotating the bearing in the horizontal direction. it can. The method of grinding with a grinding wheel using the jig of the present invention provides a grinding plane with better smoothness than the conventional grinding with a flat grindstone.

In the bearing grinding jig according to the present invention, the clamp flange on which the inner ring pressure member is mounted is mounted on the spline shaft via the link ball. The upper surface of the inner ring pressure member can be easily brought into parallel contact with the bottom of the inner ring of the bearing, which is the material to be ground.

Hereinafter, the present invention will be described in more detail with reference to the drawings. FIG. 1 is a cross-sectional view of a bearing grinding jig , and the spline shaft 10 does not have a broken line showing a cross section. 2 is a plan view of the outer ring restraint and inner ring pressure member of the bearing as viewed from the direction of arrow A in FIG. 1, and FIG. 3 is a sectional view of the combination bearing (DF).

In the bearing grinding jig 1 shown in FIG. 1, the bearing grinding jig 1 is provided on the base of a grinding apparatus. Reference numeral 2 denotes a waterproof cover that prevents the grinding fluid from adhering to the air bearing 9. The hollow rotary shaft 12 supports the rotary table 7, and the rotary table 7 is surrounded by cover flanges 7a and 7b. A bearing case 4 having a two-stage annular cylindrical structure for guiding a bearing w as a material to be ground inward is provided on the top of a cylindrical jig housing material 3 including a jig base 3a provided on the rotary table 7. ing. When the outer diameter of the bearing w is 124 mm, an inner diameter of 70 mm, a height of the outer ring _{w o} is 23.95Mm, the height of the inner ring _{w i} is of 24.00 mm, the dimensions of the annular upper 4a of the bearing case 4, for example, The inner diameter is 125 mm, the outer diameter is 188 mm, the height is 20 mm, and the dimensions of the annular lower stage 4b are, for example, an inner diameter of 110 mm, an outer diameter of 138 mm, and a height of 8 mm. The bottom of the annular lower terrace 4b is subjected to substantially half of the outer ring w _o the bottom of the bearing.

The outer ring retainer 5 of the bearing is fixed to the annular upper plane of the upper guide annular cylinder 4a of the bearing case 4 by twelve bolts 6 before grinding. The outer ring restraint 5 of the bearing has an outer diameter of 188 mm, an inner diameter of 135 mm on the upper side, a central portion and a lower side of 110 mm, and has an inclined portion directed inward.

In the space 10 surrounded by the cylindrical jig housing material 3 including the bearing case 4 and the jig base 3a and the rotary table 7 supported by the hollow rotary shaft 12, the hollow rotating shaft 12 has the same axis. Cylinders 11 and 11a containing a spline shaft 13 and a hat-shaped clamp flange 14 with a cross-sectional flange are provided. The clamp flange 14 is located above the cylinder 11a and below the lower outer ring supporting annular cylinder 4b of the bearing case 4, and an inner ring pressure member 15 of the bearing is fastened with a bolt 16 to the cap-shaped head. . The inner ring pressing member 15 of this bearing, said bearing case 4 lower outer inner ring w _i the bottom of the support ring wheel guided bearing on abutting cooperation with the outer ring suppressed 5 above the bearing to secure the bearing w .

A spline shaft 13 having the same axis as the axis of the clamp flange 14 is provided in a cylinder 11 provided below the hat-shaped clamp flange 14 with a cross-sectional flange, and a link ball 17 is provided on the head of the spline shaft. The link ball 17 is inserted and brought into contact with the bottom concave portion of the hat-shaped clamp flange 14 with a cross-sectional flange, and the lower portion thereof is fixed to the top of the spline shaft 13 via the adjustment flange 14a. 14b is an adjustment bolt, and 14c is a nut.

A piston 19 in which a coil spring 18 is inserted in a concave space in an upper open concave member is received by a retainer plate 22 on the outer periphery of the lower portion of the spline shaft 13 so as to be vertically movable in the cylinder 11. A compressed air supply pipe made of polyamide resin having a compressed air discharge port 21a for supplying pressurized air to a pressurizing chamber 20 formed between the bottom of the retainer plate 22 provided in the cylinder and the bottom of the cylinder 11. 21 is provided in the hollow rotary shaft 12, and the clamp ring 14 is moved upward by introducing pressurized air into the pressurizing chamber 20, so that the inner ring pressurizing member 15 covering the upper surface of the clamp flange is made of a material to be ground. providing a clamping flange lifting means (14,17,19,21,22) to abut the inner ring _{w i} bottom of the bearing.

The link ball 17 corrects a slight tilt generated in the clamp flange 14 and makes it easy for the upper surface of the inner ring pressurizing member 15 to abut in parallel with the inner ring bottom of the bearing, which is the material to be ground. The diaphragm 28 made of a flexible material is loosely coupled to the side wall of the piston 19 and the inner wall of the cylinder 11, and serves to prevent the pressurized air supplied to the pressurizing chamber 20 from escaping onto the piston 19. Further, the biasing force of the coil spring 18 compressed by the pressurized air introduced into the pressurizing chamber 20 biases the bottom of the clamp flange 14 via the link ball 17. When the pressurized air is dissipated from the pressurizing chamber 20, the urging force of the coil spring 18 disappears, and the clamp flange 14 is slightly lowered by the elastic recovery force, so that the inner ring pressurizing member 15 contacts the bottom of the inner ring of the bearing. Opened.

A protective cover 23 is suspended from the lateral wall of the clamp flange 14 toward the shoulder of the cylinder 11a to prevent fine dust from entering the space 24 formed by the clamp flange 14 and the cylinder 11a. The shaft 27 is used to confirm the position of the protective cover 23.

The polyamide resin hollow pressurized air supply pipe 21 is inserted into the hollow portion of the hollow rotary shaft 12a via a rotary joint 26. A pressure of pressurized air of 0.2 to 0.5 PKa is sufficient.

Rotation drive means 25 (a drive motor, a toothed drive belt, and a pulley 25a (not shown)) for rotating the hollow rotary shaft 12 having the same axis as the spline shaft 13 is provided.

Next, the process of surface grinding the bearing w using the bearing grinding jig 1 shown in FIG. 1 will be described. In FIG. 1, the grinding wheel 100 is indicated by an imaginary line and is rotated around the grinding wheel shaft 101.

(1) an outer ring w _O and the inner ring w into orbit formed between _i bearings w with interposed a plurality of rolling elements outer ring w _O and the inner ring w _i between the outer ring an annular gap to an annular rubber sealing material w _O and the inner ring It is inserted from the surface of w _{i to} a depth of 0.3 to 1.0 mm so that grinding waste cannot enter the bearing raceway.

(2) The bearing is inserted into the bearing case 4 of the bearing grinding jig 1 with the grinding surface of the bearing w of this seal structure facing upward.

(3) The outer ring retainer 5 is fixed to the upper surface of the bearing case 4 of the bearing grinding jig 1 with bolts 6 to prevent the bearing w from jumping out of the bearing case 4 when the hollow rotary shaft is rotating.

(4) The 0.3 PKa pressure air guided to the pressurized air supply pipe 12 is guided into the pressurizing chamber 20 and the piston 19 is lifted, whereby the coil spring 18 is compressed and the adjustment flange 14a is urged to link the link ball. 17 raises the push-up clamp flange 14, the inner ring pressing member 15 and the outer ring is suppressed 5 the upper and lower bearing w the inner ring pressing member 15 is brought into contact with the inner ring w _i bottom of the bearing which is fixed to the clamp flange 14 And the bearing w is fixed in the bearing case 4.

(5) The bearing w housed in the bearing case 4 by rotating the hollow rotary shaft 12 at a rotational speed of 8 to 100 min ⁻¹ by the rotational driving means 25 is around the hollow rotary shaft 12 axis and the spline shaft 13 axis. It is rotated.

(6) The circumferential outer surface of the grinding wheel 100 rotating while being lowered while rotating the grinding wheel shaft 101 of the surface grinding device at 2,000 to 3,000 min ⁻¹ rotation speed is used as a grinding surface of the bearing inner ring w _i. brought into contact, over a cut at a linear pressure of 200 kg, grinding finish inner ring w _i annular plane bearing. The grinding allowance is, for example, 0.01 to 0.50 mm.

(7) Inner ring w of bearing _i After finishing the circular surface finish grinding, the grinding wheel shaft 101 is raised to move the grinding wheel 100 away from the bearing w, and then the grinding wheel 100 is stopped after rotating the grinding wheel. Move to the standby position.

(8) The rotation of the hollow rotary shaft 10a is stopped, and then the supply of pressurized air from the pressurized air supply pipe 12 is stopped. Retainer plate 22, the piston 19 descends, the coil spring 18 is elastically restored, the inner ring w _i bottomed section force of the inner ring pressing member 15 disappears.

(9) Remove the bolt 6 and remove the outer ring retainer 5 from the bearing case 4.

(10) The bearing w subjected to surface grinding is taken out from the bearing case 4 of the bearing grinding jig 1.

The pressure line pressure applied to the bearing inner ring w _i is the abrasive grinding wheel 100 of the grinding process is grinding by a pair of bearings w, w are stacked, which is a combination bearing under pressure 200kg Is preferably selected.

Further, FIG. 1 shows a state where the outer peripheral surface of the grinding wheel 100 is rubbed with one of the left and right inner rings in the diametrical direction of the inner ring w _i and is subjected to finish grinding. In some cases, the outer peripheral surface of the grinding wheel 100 is rubbed against a half plane of the inner ring w _i and the outer ring w ₀ for finish grinding.

The bearing grinding jig of the present invention is easy to fix the bearing and provides a ground surface with excellent smoothness.

It is sectional drawing of the jig | tool for bearing grinding. FIG. 2 is a plan view of an outer ring restraint of a bearing and an inner ring pressurizing member viewed from the direction of arrow A in FIG. 1. It is sectional drawing of a combination bearing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bearing grinding jig 3 Cylindrical jig housing material 4 Bearing case 5 Outer ring restraint 6 Pressurizing chamber 8 Clamp flange 10 Spline shaft 11 Cylinder 12 Hollow rotary shaft 13 Spline shaft 14 Clamp flange 15 Inner ring pressure member 17 Link ball 18 Coil spring 19 Piston 20 Pressurizing chamber 21 Compressed air supply pipe 25a Pulley 100 Grinding wheel w Bearing (material to be ground)

Claims (2)

A bearing grinding jig (1) provided on a base of a grinding apparatus, and the bearing grinding jig (1) is an upper guide ring provided on the top of a cylindrical jig housing material (3). cylinder (4a) inside diameter outer ring _(w o) slightly larger than the diameter of the bearing (w) is to be ground material, the inner diameter of the lower outer ring supporting an annular cylinder (4b) is slightly above the outer ring diameter of the bearings (w) a bearing case of small two-stage cyclic tube structure (4), the annular upper guide ring tube of the bearing case (4) after the bearing (w) is guided before SL bearing case (4) in (4a) suppressing the outer ring of the bearing (w) which is fixed to the plane (5), by pressing the inner ring (w _i) the bottom of the bearing which is guided on the lower outer ring supporting an annular cylinder (4b) of the bearing case (4) Clamp flange (14) with inner ring pressure member (17) for fixing The retainer plate (22) that receives the clamp flange (14) and the piston (19) is supplied to the pressurized air supply pipe (21) and moved up and down by the pressurized air introduced into the pressurized chamber (20) . A bearing grinding jig (1) comprising clamp flange lifting / lowering means (14, 17, 19, 21, 22) and rotation driving means (25) for rotating the hollow rotary shaft (12) , wherein the hollow rotation The shaft center of the shaft (12), the shaft center of the rotary shaft (13), the shaft center of the bearing (w), and the shaft center of the clamp flange (14) have the same shaft center . Jig (1) . Clamping flange lifting means (14,17,19,21,22) includes an inner ring _(w i) the bottom is the inner ring pressing member for pressing the fixed link ball (17), the cross-sectional plane flanged hat-shaped clamping flange (14) splined shaft (13) provided in the resulting cylinder (11) which is provided below, this spline shaft (13) head to the shew link ball (17) of the front of the link ball (17) The clamp flange (14) is inserted into and contacted with the bottom recess, and the retainer plate (22) and the upper open concave piston (19) are fitted to the outer periphery of the lower portion of the spline shaft (13). said piston (19) with interpolation of a coil spring (18) in a recessed space of) provided in said cylinder (11), receiving the piston (19) milestone Plate (22) bottom and the cylinder (11) pressurized air supply pipe provided in the bottom of the cylinder a pressure ejection port for supplying pressurized air to the formed pressure chamber (20) between the bottom (11) of (21) wherein during idling shaft (12) provided within, said the ring ball (17) is moved upward by introducing pressurized air into the pressure chamber (20) clamping flanges (14) bottom inner wheels upper surface of the clamping flange by applying to the (w _i), characterized in that a clamping flange elevating means structure to abut the bottom, according to claim 1 bearing grinding jig according (1) .

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