JP2015150638A - Grinder for tapered roller, and method for grinding tapered roller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase grinding efficiency of a tapered roller.SOLUTION: A grinder 1 includes: a rotary holding device which holds a tapered roller 2 and rotates the tapered roller around an axis of the roller; a grindstone 6 for grinding a large end surface 2b of this tapered roller 2; a grindstone driving device 7 for rotationally driving the grindstone 6 in such a manner that a rotational speed difference occurs for the large end surface 2b of the rotating tapered roller 2; a gauge 5 for measuring an outer diameter of the tapered roller 2 being ground; and a grindstone retreating device 8 functioning as adjustment means which adjusts a cutting depth of the grindstone 6 for the large end surface 2b according to the measured outer diameter.

Description

  The present invention relates to a tapered roller grinding apparatus and a tapered roller grinding method.

  In tapered roller bearings, the large end surface of the tapered roller is in sliding contact with the flange provided at the axial end of the inner ring, so that the large end surface of the tapered roller is finished by polishing to reduce frictional resistance. It has been subjected. As an apparatus for polishing the large end face in this way, for example, there is a polishing apparatus disclosed in Patent Document 1.

  As a conventional polishing apparatus, there is an apparatus shown in FIG. The polishing apparatus 101 includes a disk-shaped carrier 103 that is rotatably provided around a support shaft 102 having an axis line 102 a as an up-down direction, and disk-shaped upper and lower boards 104 and 105 that are arranged above and below the carrier 103. A rotation driving device 106 for the upper board 104 and a rotation driving device 107 for the lower board 105, and a grindstone 108 provided on the radially outer side of the carrier 103. The upper board 104, the lower board 105, and the grindstone 108 are disposed concentrically with the carrier 103.

The grindstone 108 has a shape (C shape) from which a part of a circle is removed in plan view, and the tapered roller 110 to be polished is located between the upper board 104 and the lower board 105 in the removed intermittent region. In addition, the tapered rollers 110 that have been polished are taken out from between the upper board 104 and the lower board 105.
A plurality of pockets 103 a are formed in the circumferential direction on the outer peripheral edge of the carrier 103 so as to open vertically and radially outward. The inserted tapered roller 110 is accommodated in the pocket 103a with the large end face 110a as the radially outer side, and the large end face 110a side protrudes radially outward from the pocket 103a.
The tapered rollers 110 accommodated in the pockets 103a are sandwiched between the upper board 104 and the lower board 105, and the upper board 104 and the lower board 105 are mutually connected in the circumferential direction by the rotation driving devices 106 and 107. Rotate in the opposite direction. As a result, thrust toward the radially outer side is generated in the tapered roller 110 so that the large end surface 110a is pressed against the inner peripheral surface 108a of the grindstone 108, and the tapered roller 110 rotates while the axis 102a is centered. It can be revolved together with the carrier 103.
As described above, when the tapered roller 110 is inserted into the polishing apparatus 101 from the intermittent region, the large end surface 110a is slidably contacted with the grindstone 108 while being revolved around the support shaft 102, and the intermittent roller is polished. In the region, the tapered roller 110 whose large end face 110a is polished is taken out.

JP 2005-297181 A

  Here, the shape of the tapered roller will be described. FIG. 8A is an explanatory diagram of a tapered roller 115 (hereinafter referred to as a great tapered roller) having a large taper angle (rate) T3. FIG. 8B is an explanatory view of a tapered roller 116 (hereinafter referred to as a small tapered roller) having a small taper angle T4 (T4 <T3). When the outer peripheral surface 115b (116b) of the large (small) tapered roller 115 (116) is extended from the small end surface 115c (116c), it converges at one point P2 (P3). Hereinafter, this convergence point is referred to as a cone center. The large end faces 115a and 116a of the large and small tapered rollers 115 and 116 are convex curved surfaces, and radii around the cone centers P2 and P3 (hereinafter referred to as curvature radii) of these large end faces 115a and 116a are R2 and R3. R2 <R3. That is, in the tapered rollers 115 and 116, the radius of curvature decreases as the taper angle increases.

  In the polishing apparatus 101 shown in FIG. 7, the inner peripheral surface 108a of the grindstone 108 is an annular surface centered on the axis 102a of the support shaft 102. When the inner diameter of the inner peripheral surface 108a is R4, the inner diameter R4 is The radius of curvature R5 around the cone center P4 in the large end surface 110a of the tapered roller 110 to be polished is set to be (substantially) the same.

Therefore, as described above (see FIGS. 8A and 8B), the radius of curvature decreases as the taper angle of the tapered roller 110 increases. Therefore, as illustrated in FIG. When the taper angle is large and the radius of curvature R5 is small, the inner diameter R4 of the grindstone 108 is also small, thereby shortening the circumferential length of the inner peripheral surface 108a of the grindstone 108.
In other words, this means that in the polishing operation by the polishing apparatus 101, the revolution movement distance from when the tapered roller 110 is inserted to when it is polished by the grindstone 108 and taken out is shortened. The number of rotations also decreases. For this reason, when the radius of curvature R5 of the tapered roller 110 is small, the sliding contact (polishing) distance of the large end surface 110a of the tapered roller 110 with respect to the grindstone 108 is shortened. As a result, the large end surface 110a cannot be sufficiently polished, There is a risk of insufficient machining allowance for the large end face 110a.

  In the case of the polishing apparatus 101 shown in FIG. 7, the grinding wheel 108 is simply pressed against the large end face 110a of the tapered roller 110 and ground. Therefore, during grinding of the large end face 110a, the grinding stone 108 is in contact with the large end face 110a. The amount of cut (depth) cannot be adjusted. For this reason, it may be necessary to refinish the large end face 110a, and the grinding efficiency is poor.

  Accordingly, an object of the present invention is to provide a tapered roller grinding apparatus and a tapered roller grinding method capable of improving the grinding efficiency of the tapered roller.

  (1) In order to achieve the above object, a tapered roller grinding apparatus of the present invention holds a tapered roller and rotates a rotating holding device that rotates around the roller axis of the tapered roller, and grinds the large end surface of the tapered roller. A grinding wheel, a driving device for a grinding wheel that rotationally drives the grinding wheel so as to produce a rotational speed difference with respect to the large end surface of the rotating tapered roller, and an outer diameter of the tapered roller that is being ground And a adjusting means for adjusting a cutting amount of the grindstone with respect to the large end surface according to the measured outer diameter.

  According to this configuration, since the cutting amount of the grindstone with respect to the large end surface is adjusted (changed) according to the measured outer diameter of the tapered roller, the cutting amount is changed when the measured outer diameter reaches a predetermined value. Thus, not only rough grinding of the large end surface but also finishing grinding of the large end surface can be performed. Therefore, unlike the prior art, it is not necessary to perform finishing again after grinding, and the grinding efficiency can be improved.

  (2) Further, the grinding device further includes a reference body in which a part of the large end surface can contact from the axial direction, and the gauge is the tapered roller at a predetermined axial position with respect to the reference body. It is preferable that the outer diameter of the tapered roller is measured, and the adjusting means adjusts the cut amount according to the outer diameter of the tapered roller at the predetermined position in the axial direction measured by the gauge. According to this configuration, the outer diameter of the tapered roller can be controlled on the basis of the large end surface during grinding of the large end surface of the tapered roller.

(3) Further, the rotation holding device includes a pair of rolls having a roll axis parallel to the roller axis of the tapered rollers and abutting the outer peripheral surface of the tapered rollers so as to sandwich the tapered rollers, and the pair of rolls. A drive device that rotates around the roll axis to rotate the tapered roller around the roller axis; and a shoe that prevents the tapered roller from falling off between the pair of rolls in the tangential direction of the roll. There is also.
According to this configuration, the grinding operation can be performed corresponding to the tapered rollers of various sizes by changing the interval between the two rolls.

(4) A method for grinding a tapered roller according to the present invention is a method of grinding a large end surface of a tapered roller with a grindstone, and the tapered roller that rotates around a roller axis of the tapered roller while holding the tapered roller. The grindstone is rotationally driven so that a rotational speed difference occurs with respect to the large end surface of the roller, the large end surface is ground by the grindstone, and the outer diameter of the tapered roller is measured during the grinding, and the measured The cutting amount of the grindstone with respect to the large end surface is adjusted according to the outer diameter.
According to this configuration, the same effect as in the case (1) can be obtained.

  According to the present invention, when the outer diameter of the tapered roller reaches a predetermined value, it is possible to change the cutting amount, whereby not only rough grinding of the large end surface but also finishing grinding of the large end surface can be performed. It becomes possible. Therefore, unlike the prior art, it is not necessary to perform finishing again after grinding, and the grinding efficiency can be improved.

It is a front view showing a schematic structure of a tapered roller grinding device concerning one embodiment of the present invention. It is an AA arrow line view of FIG. It is explanatory drawing which shows the shaping | molding method of the outer peripheral surface of a grindstone. It is sectional drawing which shows the grindstone of a shape different from the grindstone shown in FIG. It is a graph which shows the relationship between the cutting amount of a grindstone, and time passage. It is explanatory drawing explaining the measuring method of the outer diameter of a tapered roller. It is a simplified sectional view showing a conventional tapered roller polishing apparatus. (A) is explanatory drawing of a tapered roller with a large taper angle, (b) is explanatory drawing of a tapered roller with a small taper angle.

Preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a front view showing a schematic configuration of a tapered roller grinding apparatus according to an embodiment of the present invention. FIG. 2 is a view taken along line AA in FIG. As shown in FIGS. 1 and 2, the grinding device 1 includes a rotation holding device 3, a reference body (front plate) 4, an in-process gauge 5, a grindstone 6, a grindstone drive device 7, and a grindstone advance / retreat. A device 8, a backup cylinder 9, a displacement sensor 10, and a control device 11 are included.
The tapered roller 2 to be ground (see FIG. 2) has a small end surface 2a positioned at one end in the axial direction, a large end surface 2b positioned at the other end in the axial direction, and a tapered outer peripheral surface 2c. The tapered roller 2 is installed in the grinding apparatus 1 with its axis (roller axis) 2d horizontal, and the large end surface 2b is ground by the grindstone 6.

The rotation holding device 3 (see FIG. 1) has a function of rotating around the axis 2d while holding the tapered roller 2. The rotation holding device 3 according to the present embodiment is a two-roll / one-shoe type, and supports the upper and lower rolls 19 and 20 and the rolls 19 and 20 so as to be rotatable around respective axis lines (roll axis lines) 19a and 20a. Bearing devices 21 and 22, upper and lower roll drive devices 23 and 24, both roll advance / retreat devices 25, and a shoe 26.
Both rolls 19 and 20 are arranged above and below the tapered roller 2, have axis lines 19 a and 20 a parallel to the axis line 2 d of the tapered roller 2, and sandwich the tapered roller 2. The outer peripheral surface 19b of the upper roll 19 is curved and convex toward the outside in the radial direction. The outer peripheral surface 20b of the lower roll 20 is tapered (reduced diameter) toward one side in the axial direction (right direction in FIG. 1).

In FIG. 1, the tapered roller 2 is tapered (reduced shape) toward the left side, whereas the lower roll 20 is tapered (reduced shape) toward the right side. The taper angle of the tapered roller 2 and the taper angle of the lower roll 20 are the same, and the lower roll 20 can be in line contact with the outer peripheral surface of the tapered roller 2.
Support shafts 27 and 28 are provided at the center of each roll 19 and 20, and the support shafts 27 and 28 are rotatably supported by bearing devices 21 and 22. The rolls 19 and 20 are rotationally driven in the same direction with respect to the circumferential direction by the drive devices 23 and 24 including a motor and the like.
One of the two rolls 19, 20, for example, the upper roll 19 can be moved forward and backward with respect to the lower roll 20 by the advance / retreat device 25, thereby adjusting the distance between the two rolls 19, 20. The distance between the rolls 19 and 20 is adjusted by the advance / retreat device 25, and a thrust (propulsive force) toward the reference body 4 is generated in the tapered roller 2 sandwiched between the rolls 19 and 20. The rolls 19 and 20 may be provided with advance / retreat devices, respectively.

In FIG. 2, the shoe 26 is provided on the side of the outer peripheral surface 2 c of the tapered roller 2. The side surface 26 a of the shoe 26 is an inclined surface that is separated from the axis 2 d of the tapered roller 2 toward the large end surface 2 b side of the tapered roller 2 so as to correspond to the tapered outer peripheral surface 2 c of the tapered roller 2. The side surface 26a can guide the tapered roller 2 by sliding contact with the outer peripheral surface 2c of the tapered roller 2, and the rotating tapered roller 2 is tangential to the rolls 19, 20 from between the rolls 19, 20 (FIG. 2). Prevents falling off (upward).
The reference body 4 is a member capable of coming into contact with a part of the large end surface 2b of the tapered roller 2 on which the axial thrust acts, from the axial direction. The reference body 4 is immovable (fixed), and the tapered roller 2 on which the thrust acts can be positioned in the axial direction. The reference body 4 has a surface that can come into contact with the large end surface 2b as a reference surface 4a.
When the thrust, that is, the pressing force for pressing the large end surface 2b of the tapered roller 2 in the direction of the reference body 4 is insufficient, the backup cylinder 9 presses the tapered roller 2 in the axial direction. Thereby, the constant pressure process which presses the big end surface 2b with a fixed pressure with respect to the grindstone 6 is attained. As the backup cylinder 9, a hydraulic cylinder, a pneumatic cylinder or the like is used.
The displacement sensor 10 monitors the pushing amount of the tapered roller 2 by the backup cylinder 9 in order to adjust the pressing force (pressing force).

The grindstone 6 has a vertical disk shape, and is provided such that its axis and the direction orthogonal to the axis (radial direction 6a) are in the horizontal direction. The outer peripheral surface 6c of the grindstone 6 is in sliding contact with a part of the large end surface 2b of the tapered roller 2, and the sliding contact portion is ground. As shown in FIG. 2, the reference body 4 can be in contact with the half region of the large end surface 2b, and the grindstone 6 is in contact with the remaining region.
The grindstone 6 is rotationally driven by a grindstone driving device 7 including a motor and the like. In the sliding contact portion between the grindstone 6 and the large end surface 2b of the tapered roller 2, the rotational directions of the grindstone 6 and the large end surface 2b are set to be opposite to each other. That is, the grindstone 6 rotates so that a rotational speed difference is generated with respect to the large end surface 2 b of the rotating tapered roller 2.
FIG. 3 is an explanatory view showing a method for forming the outer peripheral surface 6 c of the grindstone 6. As shown in FIG. 3, the outer peripheral surface 6 c of the grindstone 6 is processed into a curved concave shape by a dresser or a rotary dresser 29. The large end surface 2b of the tapered roller 2 (see FIG. 2) is ground (transferred) into a curved convex shape along the curved concave shape of the outer peripheral surface 6c of the grindstone 6. The dresser 29 is two-axis numerically controlled (NC) and can move forward and backward with respect to the outer peripheral surface 6c and can move in the vertical direction.
The grindstone 6 may have another form. FIG. 4 is a cross-sectional view showing a grindstone 6 having a shape different from that of the grindstone 6 of FIG. The grindstone 6 may not be a disc shape, but may be a bottomed cylindrical cup shape as shown in FIG. In this case, the grindstone 6 includes a bottomed cylindrical mounting body 30 and an annular grindstone main body 31 fixed to the opening edge of the mounting body 30. Then, the mounting body 30 may be mounted on a quill (main shaft) 32, the grindstone 6 may be rotated, and the large end surface 2 b of the tapered roller 2 may be ground by the grindstone body 31.

  Further, the grindstone 6 can be advanced and retracted with respect to the large end surface 2b by a grindstone advancing / retreating device 8 composed of a telescopic actuator or the like. In the present embodiment, the reference surface 4a of the reference body 4 on which the large end surface 2b of the tapered roller 2 can come into contact is set as a reference position in the axial direction, so the shaft of the outer peripheral surface 6c of the grindstone 6 from the reference surface 4a. The direction protrusion amount (protrusion dimension) is set as the cut amount with respect to the large end surface 2 b of the grindstone 6. Thus, since the protrusion amount of the grindstone 6 from the reference surface 4a that can come into contact with the large end surface 2b is set as the cut amount of the grindstone 6, the cut amount with respect to the tapered roller 4 can be accurately controlled. . From the above, the advancing / retreating device 8 for the grindstone functions as an adjusting means for adjusting the cutting amount of the grindstone 6.

  In FIG. 2, the in-process gauge 5 measures the outer diameter at a predetermined position on the large end surface 2 b side of the tapered roller 2 during the grinding operation of the tapered roller 2. In particular, in this embodiment, the in-process gauge 5 measures the outer diameter of the tapered roller 2 at a predetermined axial position with respect to the reference surface 4a of the reference body 4. That is, the outer diameter of the tapered roller 2 at a predetermined position in the axial direction from the reference surface 4a is measured. The in-process gauge 5 includes a gauge main body 33 having a processing circuit and the like, a casing 34 having the gauge main body 33 therein, an arm 35 that partially contacts (point contact) with the outer peripheral surface 2c of the tapered roller 2. Note that the gauge 5 may be of another type or a non-contact type measuring instrument.

The control device 11 receives signals (signals about measurement values) from the in-process gauge 5 and the displacement sensor 10, and also drives the grindstone drive device 7, the grindstone advance / retreat device 8, the backup cylinder 9, and the drive devices 23 for each roll. , 24 and the roll advance / retreat apparatus 25 are controlled.
In particular, according to the outer diameter at a predetermined position of the tapered roller 2 measured by the in-process gauge 5, the control device 11 controls the grindstone advancement / retraction device 8 (and the backup cylinder 9), and the grindstone 6 with respect to the large end surface 2b. Control the depth of cut. That is, the control device 11 performs overall control related to grinding of the large end surface 2b. Thereby, a desired machining allowance (cutting allowance) is obtained on the large end face 2b.

According to the grinding apparatus 1 having the above configuration, the large end surface 2b of the tapered roller 2 can be ground as follows.
In FIG. 1, the tapered roller 2 is sandwiched by the upper and lower rolls 19 and 20, and the upper and lower rolls 19 and 20 are rotationally driven by the upper and lower roll driving devices 23 and 24. Can be rotated around the axis 2 d while holding the tapered roller 2. When the upper and lower rolls 19 and 20 are in contact with the tapered outer peripheral surface 2c of the tapered roller 2, the tapered roller 2 is pushed toward the reference body 4 side.

  In this state, the grindstone 6 is rotationally driven by the grindstone driving device 7, and the grindstone 6 is advanced toward the large end surface 2b of the tapered roller 2 by the grindstone advancing / retreating device 8, as shown by an imaginary line in FIG. The outer peripheral surface 6 c of the grindstone 6 is brought into sliding contact with the large end surface 2 b, and the large end surface 2 b is ground by the grindstone 6. 2, the grindstone 6 protrudes greatly in the axial direction from the reference surface 4a of the reference body 4, but this is exaggerated for easy understanding. The actual protrusion amount of the grindstone 6 is slight.

At this time, the grindstone 6 rotates with a rotational speed difference with respect to the large end surface 2 b of the rotating tapered roller 2. That is, in the present embodiment, the grindstone 6 is also rotationally driven by the grindstone driving device 7 in a state where the tapered roller 2 is rotated by the upper and lower rolls 19, 20, and the grindstone 6 and the large end surface 2 b of the tapered roller 2 are In the sliding contact portion, the rotational directions of the grindstone 6 and the large end surface 2b are opposite to each other. Thereby, the relative sliding contact (grinding) speed of the grindstone 6 with respect to the large end surface 2b of the grindstone 6 can be increased, the grinding efficiency of the large end surface 2b can be improved, and the grinding time per one of the tapered rollers 2 can be increased. Can be shortened.
Further, during grinding, the tapered roller 2 receives an axial force (reaction force) from the grindstone 6 toward the backup cylinder 9 due to a grinding load (resistance). When this force is large and the force for pushing the large end surface 2b toward the reference body 4 and the grindstone 6 is insufficient, the backup cylinder 9 is caused to function.

  Further, at the time of grinding, the grindstone 6 is protruded in the axial direction toward the large end surface 2b rather than the reference surface 4a of the reference body 4. This protrusion amount becomes the cutting amount of the grindstone 6 with respect to the large end surface 2b. Then, while measuring the outer diameter at a position spaced apart from the large end face 2b of the tapered roller 2 in the axial direction (hereinafter referred to as the outer diameter on the large end face 2b side) by the in-process gauge 5, the infeed amount is adjusted and the grinding is performed. Is performed as follows. That is, the outer diameter on the large end surface 2b side of the tapered roller 2 is measured by the in-process gauge 5 during grinding of the large end surface 2b by the grindstone 6, and the cutting amount of the grindstone 6 with respect to the large end surface 2b is determined according to the measured outer diameter. Adjustment is performed by causing the control device 11 and the grindstone advance / retreat device 8 to function.

FIG. 5 is a graph showing the relationship between the amount of cutting of the grindstone 6 relative to the large end face 2b and the passage of time. The vertical axis in FIG. 5 indicates the cutting amount of the grindstone 6, and the horizontal axis in FIG. 5 indicates the passage of time.
Before starting the grinding operation, as shown at “point A” in FIG. 5, the end of the outer peripheral surface 6 c of the grindstone 6 (see FIG. 2) on the tapered roller 2 side is the large end surface 2 b of the tapered roller 2 and the large end surface. 2b is positioned at a standby position that is largely retracted from the reference surface 4a of the reference body 4 with which it abuts.
In order to start the grinding operation, first, as shown from “Point A” to “Point B” in FIG. 5, the grindstone 6 is advanced from the standby position toward the tapered roller 2 at a relatively high first advance speed. Then, it is moved to the preparation position on the standby position side with respect to the reference surface 4a.
Next, as shown from “Point B” to “Point C” in FIG. 5, the grindstone 6 is advanced from the preparation position at a second forward speed that is slower than the first forward speed, and is at the same position as the reference plane 4 a in the axial direction. Is moved to the grinding start position.

Thereafter, as indicated by “Point C” to “Point D” in FIG. 5, the grindstone 6 is advanced from the grinding start position at a third forward speed lower than the second forward speed, and the grindstone 6 is moved from the reference surface 4 a to the first position. The predetermined dimension y ₁ is moved to the rough grinding position projected to the tapered roller 2 side (front side). At the time of this advance, the grindstone 6 is brought into sliding contact with the large end surface 2b to grind the large end surface 2b.
After moving the grinding wheel 6 to the rough grinding position, as shown by the "point E" from "point D" in FIG. 5, to retain the grinding wheel 6 to the rough grinding position, said first predetermined size by grinding 6 y ₁ The large end face 2b is roughly ground with a large cutting amount. In addition, since both the rolls 19 and 20 hold the tapered outer peripheral surface 2c of the tapered roller 2, the tapered roller 2 is pressed to the reference surface 4a side, but the large end surface 2b and the reference surface There is a gap between 4a. As the large end surface 2b is ground, the tapered roller 2 slightly moves toward the reference surface 4a. Therefore, the measured value by the in-process gauge 5 becomes extremely small.

And when the measured value by the in-process gauge 5 becomes a predetermined first set value (rough grinding end value), as shown from “point E” to “point F” in FIG. Finish grinding by retreating from the rough grinding position at a relatively fast first retraction speed (moving to the standby position side) and causing the grindstone 6 to protrude from the reference surface 4a to the tapered roller 2 side by the _second predetermined dimension y2. Move to position. Even during this retreat, the grindstone 6 is in sliding contact with the large end surface 2b to grind the large end surface 2b. Since both the rolls 19 and 20 sandwich the tapered outer peripheral surface 2c of the tapered roller 2, the tapered roller 2 is pushed to the reference surface 4a side, and the large end surface 2b and the reference surface 4a. There is a very small gap between them.
After moving the grinding wheel 6 to the finish grinding position, as shown by the "point G" from "point F" in Figure 5, held in grinding position finishing grindstone 6, the second predetermined size by grinding 6 y ₂ The large end face 2b is finish-ground with a small cut amount of. By this grinding, the measured value by the in-process gauge 5 becomes extremely small.
Then, when the measured value reaches a predetermined second set value (finish grinding end value) or when a predetermined time has elapsed, as shown by “point H” to “point H” in FIG. 6 is moved backward from the finish grinding position at the second reverse speed higher than the first reverse speed and moved to the standby position.
As a result, the large end surface 2b of the tapered roller 2 is finish-ground through rough grinding, and the grinding operation is completed.
The first predetermined dimension y ₁ and the second predetermined dimension y ₂ are variable, and are appropriately set according to product characteristics, required accuracy, and the like.

As described above, according to the grinding device 2 of the present embodiment and the grinding method using this device 2, the grindstone for the large end surface 2b of the tapered roller 2 according to the outer diameter of the tapered roller 2 measured by the in-process gauge 5. 6 is adjusted (changed). For this reason, when the outer diameter measured by the gauge 5 reaches a predetermined value (the first set value and the second set value), the cutting amount of the grindstone 6 can be changed. Not only rough grinding of 2b but also finishing grinding of the large end face 2 can be performed. Therefore, unlike the prior art, it is not necessary to perform finishing again after grinding, and the grinding efficiency can be improved.
In this embodiment, the in-process gauge 5 measures the outer diameter of the tapered roller 2 at a predetermined position in the axial direction with reference to the reference surface 4 a, and the tapered roller 2 at the predetermined position in the axial direction measured by the gauge 5. The cut amount is adjusted according to the outer diameter of the. For this reason, when the large end surface 2b of the tapered roller 2 is ground, the outer diameter of the tapered roller 2 can be controlled on the basis of the large end surface 2b. That is, it is possible to ensure the accuracy of the outer diameter dimension.
Further, when the tapered roller 2 is sandwiched and rotated by the upper and lower rolls 19 and 20, the shoe 26 is brought into contact with the outer peripheral surface 2 c of the tapered roller 2 to position the tapered roller 2 and the tapered roller 2. The axial movement is limited by the reference body 4, and the tapered roller 2 is positioned in the axial direction. Accordingly, the tapered roller 2 can be accurately positioned during the grinding operation, the behavior of the tapered roller 2 can be stabilized and the grinding operation can be performed, and the tapered roller 2 with high accuracy can be obtained.

For reference, a general method for measuring the outer diameter of the tapered roller 2 is shown in FIG. As shown in FIG. 6, when the tapered outer peripheral surface 2c of the tapered roller 2 is extended on the small end surface 2a side, it converges on the cone center P1. The radius of curvature of the large end surface 2b centered on the cone center P1 is R1.
When measuring the outer diameter of the tapered roller 2 at a predetermined position (2c2, 2c3) in the axial direction, the sine bar 15 is placed on the measuring table 14 whose upper surface is horizontal. The upper surface of the sign bar 15 is an inclined mounting surface 15a. The inclination angle θ of the mounting surface 15a is twice the taper angle T1 of the tapered roller 2.
Thereby, the upper side outline 2c1 of the outer peripheral surface 2c of the tapered roller 2 mounted on the mounting surface 15a is made horizontal. The measuring table 14 is provided with a stopper 16 that comes into contact with the large end surface 2 b of the tapered roller 2 to prevent the tapered roller 2 from sliding off the sign bar 15. The outer diameter of the tapered roller 2 can be measured at the first measurement point 2c2 and the second measurement point 2c3 at predetermined positions in the axial direction with reference to the large end surface 2b on the outer peripheral surface 2c.

  In addition, the grinding apparatus 1 of this invention is not limited to said embodiment, It can implement by changing suitably. For example, in the above embodiment, the tapered roller 2 is rotated by the upper and lower rolls 19 and 20, but the tapered roller 2 may be rotated by being held by a lathe chuck.

  DESCRIPTION OF SYMBOLS 1: Grinding device, 2: Tapered roller, 2b: Large end surface, 2c: Outer peripheral surface, 2d: Axis, 3: Rotation holding device, 4: Reference body, 5: In-process gauge, 6: Grinding wheel, 7: Driving for grinding wheel Device: 8: Advancing / retreating device for grinding wheel, 11: Control device, 19: Upper roll, 19a: Axis, 20: Lower roll, 20a: Axis, 23: Drive device for upper roll, 24: Drive device for lower roll, 26: Shoe

Claims (4)

A rotation holding device that holds the tapered roller and rotates it around the roller axis of the tapered roller;
A grindstone for grinding the large end face of the tapered roller;
A grindstone driving device that rotationally drives the grindstone so that a rotational speed difference is generated with respect to the large end surface of the rotating tapered roller;
A gauge for measuring the outer diameter of the tapered roller being ground;
A tapered roller grinding apparatus, comprising: an adjusting unit that adjusts a cutting amount of the grindstone with respect to the large end surface according to the measured outer diameter. A reference body in which a part of the large end face can abut from the axial direction;
The gauge measures the outer diameter of the tapered roller at a predetermined axial position with respect to the reference body,
2. The tapered roller grinding apparatus according to claim 1, wherein the adjusting unit adjusts the cutting amount according to an outer diameter of the tapered roller at a predetermined position in the axial direction measured by the gauge. The rotation holding device is
A pair of rolls having a roll axis parallel to the roller axis of the tapered roller and abutting the outer peripheral surface of the tapered roller and sandwiching the tapered roller;
A drive device that rotates the pair of rolls around the roll axis and rotates the tapered rollers around the roller axis; and
The tapered roller grinding apparatus according to claim 1, further comprising a shoe that prevents the tapered roller from dropping in a tangential direction of the roll from between the pair of rolls. A tapered roller grinding method in which a large end surface of a tapered roller is ground with a grindstone,
While holding the tapered roller, rotate it around the roller axis of the tapered roller,
The grindstone is rotationally driven so that a rotational speed difference is generated with respect to the large end surface of the rotating tapered roller,
Grinding the large end surface with the grindstone and measuring the outer diameter of the tapered roller during grinding,
A method for grinding a tapered roller, comprising adjusting a cutting amount of the grindstone with respect to the large end surface in accordance with the measured outer diameter.

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