JP2000271845A - Spline ball groove grinding method for work bore, grinding wheel, and dress method for grinding wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the grinding efficiency and enhance the accuracy of the finishing by inclining a rod grinding wheel by a prescribed angle relative to a work axis, moving it parallel to the work axis, and grinding a spline ball groove in the work bore. SOLUTION: A grinding spindle 1 and a grinding wheel 4 or an inside/outside double layer structural body with a first and a second grinding wheel holder 2, 3 are made to incline by a prescribed angle β deg. relative to a work axis Lb and moves parallel to the work axis Lb. The grinding wheel 4 starts from a dress position, abuts on the bore of the work W in a prescribed position A, and starts the grinding of a spline ball groove. The grinding wheel 4 moves in the same direction with its attitude held as it is and implements a grinding process for providing a spline ball groove b1 ground in a grinding end position B. When the grinding wheel 4 reaches the grinding end position B, the grinding spindle 1 is drawn up. Even then, the inclined angle β deg. of the grinding wheel 4 is unchanged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grinding method for grinding a spline ball groove with respect to the inner diameter of a work, a grinding wheel for actually grinding the work, and a dressing method for a grinding wheel for dressing the grinding wheel.

[0002]

2. Description of the Related Art A grinding apparatus for grinding a spline ball groove on the inner diameter of a work supports a substantially disc-shaped grinding wheel on the tip of a spindle which is a main body of the apparatus, and moves the grinding wheel while rotating the grinding wheel. The inner diameter of the workpiece is ground at the peripheral end of the grinding wheel.

[0003] To explain, the grinding wheel is rotatably supported by a spindle via a bearing. A pulley is connected to the grinding wheel, and a belt is stretched between the grinding wheel and a pulley attached to a rotating shaft of a drive motor provided at a position separated from the grinding wheel.

Accordingly, the grinding wheel is driven by a drive motor via a pulley via a belt. Then, the spindle and the grinding wheel are oriented in parallel with the workpiece axis, and are axially moved in parallel with the workpiece axis to grind the spline ball groove by applying the peripheral edge of the grinding wheel to the inner diameter of the workpiece.

[0005] Further, as one example of the prior art, a grinding method in which a grinding wheel is inclined at a predetermined angle β ° with respect to the axis of the work and is moved in parallel with the axis to grind a groove in the inner diameter of the work is shown in FIG. As shown in FIG. 10, there is a dressing method of a single stone turning type dressing method of a grinding wheel. (Japanese Patent Laid-Open No. 5-131372)

[0006]

According to such a grinding apparatus, since the bearing is provided within the diameter of the disc-shaped grinding wheel, the diameter of the bearing is smaller than the diameter of the grinding wheel, and the diameter of the bearing itself is small. Rigidity against grinding force is weak. Specifically, a grinding wheel having a circular shape cannot increase the grinding force in two directions, a tangential direction and a normal direction, required for grinding a work.

[0007] Therefore, in the grinding in which the disk-shaped grinding wheel is oriented in parallel with the work axis and the axis is moved in parallel with the work axis, the grinding efficiency is poor and there is a difficulty in the finished surface roughness of the spline ball groove. .

Furthermore, since the diameter of the bearing is small, the bearing is liable to be subjected to a load during grinding and has a short rotating life. Since the size of the drive belt cannot be increased, there is a problem that the tension of the belt is insufficient and durability is poor.

Further, a grinding method in which the grinding wheel is inclined at a predetermined angle β ° with respect to the workpiece axis and is axially moved in parallel with the axis to grind a spline ball groove in the workpiece inner diameter,
As shown in FIG. 10, when the dressing method of the grinding wheel is a dressing method of a single stone turning type, there are the following problems.

That is, when the groove is dressed after the dressing by the above dressing method, the grinding method is interference grinding, so that undulation is generated instead of a single R. Even when a Gothic arch groove is machined, an accurate groove shape cannot be obtained. This is shown in FIG. FIG. 11 shows a shape error of a gothic arch groove dressed with a single stone dress type aiming at the following dimensions. R = 3 mm, contact angle 45 °, θ = 40 °-
Although R = 3 mm near the 50 ° position can be ensured, a shape error at the groove bottom or groove shoulder causes a shape error as shown in the lower diagram of FIG.

The present invention has been made in view of the above circumstances, and a first object of the present invention is to obtain an improvement in grinding efficiency and a high precision of finish using at least a bar-shaped grinding wheel. An object of the present invention is to provide a method for grinding a spline ball groove of the inner diameter of a work in which the durability of a grinding wheel and its driving parts is improved.

A second object is to specify a configuration of a bar-shaped grinding wheel that is most suitable for grinding a spline ball groove on the inner diameter of a workpiece, to increase the strength, obtain a long life and a highly efficient grinding, It is an object of the present invention to provide a grinding wheel with high precision of finishing.

A third object of the present invention is to provide a method of dressing a grinding wheel that does not cause interference grinding with respect to a bar-shaped grinding wheel that grinds a spline ball groove inside a workpiece.

A fourth object of the present invention is to form a grinding wheel on a bar-shaped grinding wheel for grinding a spline ball groove of an inner diameter of a workpiece by setting an optimum grinding wheel forming amount and forming the grinding wheel. It is an object of the present invention to provide a dressing method for a grinding wheel, in which dress is regulated to obtain high-efficiency grinding and to achieve high-precision finishing.

[0015]

According to a first aspect of the present invention, there is provided a method for grinding a spline ball groove having a workpiece inner diameter, wherein a rod-shaped grinding wheel is provided at a predetermined angle with respect to a workpiece axis. The spline ball groove is formed on the inner diameter of the work by tilting at an angle of β ° and moving axially in parallel with the work axis.

In order to satisfy the second object, the grinding wheel according to the second aspect of the present invention is characterized in that the grinding wheel is inclined at a predetermined angle β ° with respect to the workpiece axis, and moves axially in parallel with the workpiece axis. In a grinding wheel that grinds a spline ball groove on the inner diameter, a rod-shaped grinding wheel support made of a metal material, an inner grinding wheel portion attached to the peripheral surface of the grinding wheel support, and a peripheral surface of the inner grinding wheel portion, And an outer layer grinding part for grinding a spline ball groove in the inner diameter of the work.

In order to satisfy the third object, a dressing method of a grinding wheel according to a third aspect of the present invention, as a third aspect, inclines at a predetermined angle β ° with respect to the workpiece axis and moves the axis parallel to the workpiece axis. In the method of dressing a grinding wheel for dressing a grinding wheel for grinding a spline ball groove on the inner diameter of the workpiece, the rotary wheel having the overall shape is obtained by axially moving the grinding wheel at a predetermined angle β °. It is characterized in that the dress is done through the aiming of the center position of the dresser.

In order to satisfy the fourth object, a dressing method of a grinding wheel according to a fourth aspect of the present invention is as follows. In the method of dressing a grinding wheel for grinding a spline ball groove on the inner diameter of the workpiece, the grinding wheel is axially moved while being inclined at a predetermined angle β ° to form a dress groove having an arc-shaped cross section. A first positioning step of contacting with the side end and detecting the position, and after detecting the dress groove contact position of the grinding wheel in the first positioning step, the grinding wheel is inclined at a predetermined angle β °. A second positioning step of moving the shaft while keeping it in contact with the other end of the dress groove and detecting the position, and detecting the dress contact position of the grinding wheel by the second positioning step, Set the whetstone at a specified angle a third positioning step of positioning at an intermediate position between the contact position of the dress groove in the first positioning step and the contact position of the dress groove in the second positioning step while being inclined at an angle of β °; After the positioning process,
A dressing step of holding the position of the grinding wheel at an intermediate position, contacting the dress groove, and dressing the entire surface of the grinding wheel.

In order to satisfy the fourth object, a dressing method for a grinding wheel according to a fifth aspect of the present invention is characterized in that, in the fifth aspect, the grinding wheel is inclined at a predetermined angle β ° with respect to the workpiece axis and is moved axially in parallel with the workpiece axis. In a method of dressing a grinding wheel for grinding a spline ball groove on the inner diameter of a workpiece, the grinding wheel is axially moved while being inclined at a predetermined angle β ° to form a dress groove having a semi-circular cross section. A first positioning step of contacting with the side end and detecting the position, and after detecting the dress groove contact position of the grinding wheel in the first positioning step, the grinding wheel is inclined at a predetermined angle β °. A second positioning step of axially moving to the dress groove approximate center point O where the vertical Z axis and the left and right Y axis intersect, and after setting the position of the grinding wheel by the second positioning step, the grinding wheel is set at a predetermined angle. β ° diagonally A dressing step of moving in the vertical or horizontal Y or Z-axis directions while tilting and dressing the entire surface of the grinding wheel.

According to the first aspect of the present invention, by adopting a means for solving such a problem, since the rod-shaped grinding wheel is used in an inclined state, the rigidity with respect to the grinding force is increased, thereby improving the grinding efficiency and improving the finish. It is possible to obtain high precision and to improve the durability of the grinding wheel and its driving parts.

According to the second aspect of the present invention, since the configuration of the bar-shaped grinding wheel that is most suitable for grinding the spline ball groove on the inner diameter of the workpiece is specified, the strength is increased, and a long life and high efficiency grinding can be obtained. Accuracy can be improved.

According to the third aspect of the present invention, a grinding wheel for tilting a predetermined angle β ° with respect to the workpiece axis and moving the axis in parallel with the workpiece axis to dress a grinding wheel for grinding a spline ball groove on the inner diameter of the workpiece. In the dressing method, the grinding wheel is axially moved in a state of being inclined at a predetermined angle β °, and the dressing is performed by aiming at the center position of the rotary dresser having the overall shape. There is no interference, and no undulation occurs in the shape of the groove R of the ball groove, and a single groove R is formed. further,
An accurate shape can be obtained even when a Gothic arch groove is machined.

According to the fourth and fifth aspects of the present invention, the grinding wheel is formed by setting an optimum grinding wheel forming amount for the bar-shaped grinding wheel for grinding the spline ball groove of the workpiece inner diameter.
By restricting the dressing of the grinding wheel, the life of the grinding wheel can be extended and the grinding efficiency can be improved, and the finishing can be performed with high precision.

[0024]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a grinding apparatus K that performs a first grinding step. With this grinding device K, a spindle ball groove b1 ground to the inner diameter of the work W is obtained. The work W is mounted on the rotary table T and fixed by chucking, and is rotated by a predetermined angle every time the grinding operation of the grinding device K is completed.

In the grinding device K, a first grinding wheel holder 2 and a second grinding wheel holder 3 are attached to a tip of a grinding spindle 1 which is a main body of the device in a connected state. further,
A bar-shaped grinding wheel 4 is attached to the tip of the second grinding wheel holder 3.

The grinding spindle 1, the first and second grinding wheel holders 2, 3 and the grinding wheel 4 are all assembled along the same axis La. The axis La is set so as to be inclined at a predetermined angle β ° with respect to the workpiece axis Lb, which is a vertical direction in the figure, and moves axially in parallel with the workpiece axis Lb.

The movement amount ZL of the grinding wheel 4 is the distance itself from the top dead center Oa to the bottom dead center Ob of the grinding spindle 1. When the grinding spindle 1 is located at the top dead center Oa, the tip of the grinding wheel 4 Is arranged to dress a dresser device D described later.

The bottom dead center Ob position of the grinding spindle 1 corresponds to the grinding end position B of the grinding wheel 4 with respect to the workpiece W. The point A between these points is the grinding start position, and the grinding stroke GL of the grinding wheel 4 is the distance from the point A to the point B.

The second grindstone holder 3 on which the grinding wheel 4 is mounted and the first grindstone holder 2 connected to the second grindstone holder 3 are tilted with the grinding operation of the grinding wheel 4. It is inserted into the inner diameter of the work W as it is.

Then, at the grinding end position B, the grinding wheel and the first and second grinding wheel holders 2 and 3 have the work W
Although it is inserted into the inner diameter, at this time, the grindstone holders 2 and 3 are still set at an inclination angle β ° that does not contact the inner diameter of the work W at all.

FIG. 3 shows a detailed configuration of the grinding wheel 4. The grinding wheel 4 is integrated with a second wheel holder 3 made of a rod-shaped metal material, and the second wheel holder 3 serves as a wheel support. A screw portion 3a is provided at one end of the second grindstone holder 3, and is screwed into the first grindstone holder 2 described above.

A straight tapered portion 3b is formed at both ends from the screw portion 3a, and the tip is a straight portion 3c having a diameter much smaller than the diameter of the tapered portion 3b and a predetermined length. Knurling is applied to the proximal end outer diameter of the straight portion 3c.

The grinding wheel 4 comprises two layers of inner and outer cylindrical grindstones 4a and 4b of different specifications, and is adhered to the end face of the tip of the tapered portion 3b and the outer diameter of the straight portion 3c using a strong adhesive. It is fixed.

That is, the inner layer grinding wheel portion 4a is a hollow cylindrical body having a flange at the base end, and the outer diameter of the flange is a tapered portion 3b.
The outer diameter is substantially equal to the outer diameter of the tip, and the inner diameter is set to be the same as the outer diameter of the straight portion 3c.

The inner layer grindstone portion 4a has a flange end surface which is tapered.
It is fitted until it comes into contact with the front end b, and is adhered and fixed to the front end surface of the tapered portion 3b and the outer diameter of the straight portion 3c. In particular,
Since the knurling process is performed on a part of the straight portion 3c, the adhesive strength to the inner layer grindstone portion 4a can be kept high.

The outer grinding wheel portion 4b is a simple hollow cylinder,
The inner diameter is equal to the outer diameter of the inner layer grindstone portion 4a, and the outer diameter is set to be substantially the same as the outer diameter of the tip of the tapered portion 3b and the outer diameter of the flange portion of the inner layer grindstone portion 4a. Then, the outer layer grindstone portion 4b is fitted to the outer diameter of the inner layer grindstone portion 4a, and then is adhered and fixed by using a strong adhesive to be integrated with each other.

The tip of the outer layer grindstone portion 4b and the inner layer grindstone portion 4a are both formed in an R shape having a predetermined radius of curvature.
Therefore, while the grinding wheel 4 is in the shape of a round bar, its tip is in an R shape.

The grinding wheel 4 constructed as described above is mounted at a predetermined inclination angle β ° in the grinding device K. Therefore, the grinding of the spline ball groove b1 of the inner diameter of the work W is actually performed by the outer layer. This is performed at the R-shaped portion of the grindstone portion 4b.

FIGS. 5 and 6 show a schematic configuration of a grinding device K and a dresser device D for dressing the grinding wheel 4 of the grinding device K. In the dresser device D, reference numeral 5 in the figure denotes a rotary dresser spindle that houses a drive motor (not shown), and a tapered body 6 is attached to the rotating shaft. A disc-shaped rotary dresser 7 is fitted into the tapered body 6, and is further fixed to the tapered body 6 by a clamp bolt 9 via a holding collar 8.

A ball 10 is integrally attached to the clamp bolt 9, and a leaf spring 12 attached to an AE sensor 11 is positioned so as to contact the ball 10. The AE sensor 11 is a sensor bracket 1
The sensor bracket 13 is mounted on a spindle bracket 14 together with the rotary dresser spindle 5.

Along the peripheral surface of the rotary dresser 7,
Here, an arc-shaped dress groove 15 is provided.
The tip of the grinding wheel 4 is brought into contact with a means described later, and the dressing is set.

During dressing, the axis La of the grinding wheel 4 is inclined by a predetermined angle β ° with respect to the tangential direction of the rotary dresser 7 (that is, the direction of the axis Lb of the workpiece W), and the grinding wheel 4 is rotated. The shaft moves in parallel with the tangential direction of the dresser 7 to form the grinding wheel 4.

Next, an actual grinding process will be described.

As shown in FIGS. 1 and 2, the grinding spindle 1 and the first and second grindstone holders 2 and 3 together with the inside and outside 2
The grinding wheel 4 as a layered structure is tilted by a predetermined angle β ° with respect to the work axis Lb, and moves axially in parallel with the work axis Lb.

The movement start position of the grinding wheel 4 is a dressing position of the grinding wheel 4 by the rotary dresser 7, and the grinding wheel 4 is aligned with the rotary dresser 7 in advance as described later.

The grinding wheel 4 starts from the dressing position, contacts the inner diameter of the work W at a predetermined point A, and the grinding of the spline ball groove is started. The grinding wheel 4 moves in the same direction while keeping its posture, and performs a grinding step of obtaining a spline ball groove b1 ground at the grinding end position B.

When the grinding wheel 4 reaches the grinding end position B, the grinding spindle 1 is raised. At this time, the inclination angle β ° of the grinding wheel 4 does not change. Therefore, the tip of the grinding wheel 4 moves again along the ground spline ball groove b1, so that more reliable grinding is performed.

When the grinding wheel 4 ground in the above-mentioned grinding step is returned to the start position, a dressing step for the grinding wheel 4 by the rotary dresser 7 is performed. At this time, the grinding wheel 4 is still inclined obliquely with respect to the axis Lb of the workpiece W.

As shown in FIG. 4A, a spline ball groove b1 having a Gothic arch shape (or a single arc shape) in cross section is formed in the inner diameter of the work W. At this time, since the bar-shaped grinding wheel 4 is used in an inclined state, the rigidity with respect to the grinding force is increased, and highly efficient grinding is performed in a short time.

In this way, the spline ball groove b1 is ground to the inner diameter of the work W with the grinding wheel 4, and each time the grinding wheel 4 is pressed against the dress groove 15 of the rotary dresser 7 to dress and form the grinding wheel. In addition, the grinding wheel 4 always keeps extremely high grinding efficiency, and the surface roughness accuracy is stabilized and high accuracy can be obtained.

When chamfering is required along both side ends of the spline ball groove b1, after grinding a predetermined number of spline ball grooves b1, the grinding device K is replaced or the workpiece W is turned. After being removed from the table T, it is fixed to another turntable, and the spline ball groove is chamfered and ground.

As shown in FIG. 2, here, a chamfering grinding device S provided with a disk-shaped grinding wheel 20 is used. The disk-shaped grinding wheel 20 is formed so that the peripheral end thereof matches the chamfered shape to be obtained.

The disk-shaped grinding wheel 20 is rotatably supported at the tip of a holder 21, and a pulley 22 is provided on the shaft support and a drive belt 23 is engaged therewith. A drive motor 24 is attached to the other end of the holder 21. A drive pulley 25 is attached to the rotating shaft, and the drive belt 23 is engaged with the drive pulley 25.

That is, the drive belt 23 is
5 and a pulley 22 on the grinding wheel 20 side. A plurality of intermediate pulleys 26 are provided at an intermediate portion of the holder 21 at predetermined intervals.
The middle part of is engaged.

The axis Lc of such a chamfering grinding device S
Is directed in parallel with the work axis Lb, and moves axially in parallel with the work axis Lb. At this time, the disk-shaped grinding wheel 2
It goes without saying that the peripheral end of the zero is opposed to the ground spline ball groove b1.

The disk-shaped grinding wheel 20 grinds the chamfers at both ends of the ground spline ball groove b1. In this state, the grinding machine S for chamfering uses the disk-shaped grinding wheel 20 as in the conventional grinding machine and uses the workpiece axis Lb.
The bearing is small and has low rigidity against the grinding force because the shaft moves parallel to the workpiece and the workpiece axis Lb. However, since only the chamfered portion is ground, there is no problem.

As shown in FIG. 4B, a spline ball groove b2 having a desired sectional shape having chamfered portions a, a at both ends is obtained after the grinding is completed. In addition, since the grinding is performed with the bar-shaped grinding wheel 4 having high rigidity against the grinding force and then with the disk-shaped grinding wheel 20, the grinding is performed with high efficiency, and the grinding time can be reduced.

Next, the dress groove 1 of the rotary dresser 7
A method for setting the positioning of the grinding wheel 4 with respect to the grinding wheel 5 will be described. The dressing method of the grinding wheel according to the present invention is characterized in that the dressing is performed by aiming at the center position of the rotary dresser having the overall shape.

Here, the through dress means a method of performing truing and dressing by passing a grindstone rotating in a direction perpendicular to the rotary in the direction of rotation of the rotary dresser having a general shape.

As described above, the grinding wheel 4 keeps the predetermined angle β continuously from the start to the end of the positioning setting.
The tip is made to face the dress groove 15 in an inclined state. The dress groove 15 has a Gothic arch shape or a single arc shape in cross section.
The radius of curvature of the tip R is formed small. That is, it is assumed that the grinding wheel 4 is movable in the circumferential direction from the axial direction of the dress groove 15.

As shown in FIG. 7A, the grinding wheel 4 is
A first positioning step for detecting the position by axially moving the shaft in the left direction in the drawing to abut one end of the dress groove 15 is performed.

To explain, the grinding wheel 4 is used for the dress groove 1.
5, the vibration is transmitted from the rotary dresser 7 to the leaf spring 12 via the holding collar 8, the clamp bolt 9 and the ball 10. The leaf spring 12 is elastically deformed and expands the vibration, so that the AE sensor 11 senses.

As shown in FIG. 7 (B), after detecting the left end position of the dress groove 15 of the grinding wheel 4 in the first positioning step, the grinding wheel 4 is axially moved rightward in the figure, which is the Y direction. Then, a second positioning step of detecting the position of the dress groove 15 by contacting the other end of the dress groove 15 is performed.

At this time, the position of the grinding wheel 4 is also confirmed. Similarly, the vibration at the time of contact is transmitted from the rotary dresser 7 to the leaf spring 12 via the holding collar 8, the clamp bolt 9 and the ball 10, where the vibration is transmitted. AE sensor 1
1 senses.

Next, the grinding wheel 4 is axially moved in the Y direction to the left in the figure, and the contact position between the grinding wheel 4 and the left end of the dress groove 15 in the first positioning step is determined. A third positioning step of positioning the grinding wheel 4 at an intermediate position between the contact position of the grinding wheel 4 and the right end of the dress groove 15.

Here, the center position of the grinding wheel 4 coincides with the center position of the dress groove 15, and the tip is brought into contact with the dress groove 15 while holding the position of the grinding wheel 4. This is the dressing process.

In this manner, the grinding wheel 4 is accurately positioned with respect to the dress groove 15 of the rotary dresser 7, so that one-sided dressing can be prevented and an optimum grinding wheel forming amount can be obtained. Done.

In addition, due to the configuration of the grinding device K, the grinding wheel 4 is dressed every time the grinding of the spline ball groove b1 of the inner diameter of the work W is performed. In other words, the grinding by the grinding wheel 4 and the dressing on the grinding wheel 4 are performed alternately, so that the grinding wheel can be formed with high precision, the grinding efficiency can be improved, and the life of the grinding wheel 4 can be extended.

The dressing groove 15 of the rotary dresser 7
Is not limited to being formed in an arc-shaped cross section. The present invention is also applied to a dresser device as described below.

The dresser device DA shown in FIG. 8 has a dress groove 1 having a semicircular arc section along the peripheral surface of the rotary dresser 7A.
5A is formed. As in FIG. 5, the grinding wheel 4 is inclined at a predetermined angle β ° with respect to the workpiece axis Lb, and is axially moved in parallel with the workpiece axis Lb to dress.

As shown in FIG. 9, as a first positioning step, the grinding wheel 4 is axially moved to the left in the figure, which is the Y direction, to abut one end of the dress groove 15A, and the position is set to A.
The E sensor 11 detects as described above.

In the first positioning step, the grinding wheel 4
After detecting the contact position of the dress groove 15A, the grinding wheel 4
The second positioning step is performed in which the axis is moved to the approximate center point O of the dress groove 15A where the vertical Z axis and the horizontal Y axis intersect while obliquely tilting the predetermined angle β °.

In the second positioning step, the grinding wheel 4
After setting the position, the grinding wheel 4 is moved obliquely at a predetermined angle β ° in the vertical and horizontal directions of the Y or Z axis, and a dressing step of dressing the entire surface of the grinding wheel 4 is performed.

In this manner, the grinding wheel 4 is accurately positioned with respect to the dress groove 15A of the rotary dresser 7A, so that one-piece dressing is prevented and an optimum grinding wheel forming amount is obtained. Done.

The grinding wheel 4 is dressed every time the spline ball groove of the inner diameter of the workpiece W is ground, so that the grinding efficiency can be improved and the life of the grinding wheel can be prolonged by forming the grinding wheel with high precision.

[0076]

As described above, according to the first aspect of the present invention, the use of the bar-shaped grinding wheel improves the grinding efficiency and the accuracy of the finish, and at the same time ensures the durability of the grinding wheel and its driving parts. It has the effect of improving the performance.
According to the second aspect of the invention, the strength of the grinding wheel is increased, and the effects such as the prolongation of the life and the high-efficiency grinding as well as the high precision of the finish are obtained.

According to the third aspect of the present invention, no interference occurs when the work is ground, so that there is no undulation in the groove R shape of the ball groove, and a single R is formed. To play. According to the fourth and fifth inventions,
The optimum grinding wheel forming amount can be set for the grinding wheel, and there is an effect that the one-piece dress is regulated to prolong the service life of the grinding wheel and achieve high-efficiency grinding, as well as to obtain a high-precision finish.

[Brief description of the drawings]

FIG. 1 is a view for explaining a schematic configuration and operation of a grinding apparatus provided with a grinding wheel for grinding a spline ball groove of a workpiece inner diameter according to an embodiment of the present invention.

FIG. 2 is a view for explaining a spline ball groove grinding operation of the inner diameter of the work according to the embodiment.

FIG. 3 is a configuration diagram of a grinding wheel according to the embodiment.

FIG. 4 is a view for explaining a grinding state of a spline ball groove of a work inner diameter according to the embodiment;

FIG. 5 is a schematic configuration diagram of a grinding device and a dresser device according to the embodiment.

FIG. 6 is a side view of a grinding device and a dresser device according to the embodiment.

FIG. 7 is a view for sequentially explaining a dressing method of the grinding wheel according to the embodiment;

FIG. 8 is a schematic configuration diagram of a grinding device and a dresser device according to another embodiment.

FIG. 9 is a view for sequentially explaining a dressing method of the grinding wheel according to the embodiment;

FIG. 10 is a view for explaining a conventional dressing method of a grinding wheel.

FIG. 11 is a view showing a state of undulation generated in a groove shape by a conventional method of dressing a grinding wheel.

[Explanation of symbols]

 Reference numeral 4: grinding wheel, W: workpiece, b1: spline ball groove (ground), b2: spline ball groove (chamfered), 20: disk-shaped grinding wheel for chamfering, 3: grinding wheel support (second 4a: inner layer grindstone portion, 4b: outer layer grindstone portion, 15: dress groove having an arcuate cross section, 15A: dress groove having a semicircular cross section.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Katsuyuki Yamamoto 1-1 Onuma, Onuma, Saitama Prefecture Nippon Seiko Stock Company In-house (72) Inventor Hiroyuki Ikeda 1-1 Onuma Onuma, Hanyu City, Saitama Prefecture In-house Nippon Seiko Stock Company (72) Inventor Masami Tanaka 1-1 Onuma, Onuma, Saitama Prefecture NSK Ltd. In-house F-term (reference) 3C047 AA38 BB04 BB08 CC11 DD16 EE16 3C049 AA03 AA09 AA16 AA19 CA02 CB01 CB03

Claims (5)

[Claims] 1. A spline having a workpiece inner diameter, wherein a bar-shaped grinding wheel is inclined at a predetermined angle β ° with respect to a workpiece axis, and is axially moved in parallel with the workpiece axis to grind a spline ball groove in the workpiece inner diameter. Ball groove grinding method. 2. A grindstone which is inclined at a predetermined angle β ° with respect to a work axis and moves in parallel with the work axis to grind a spline ball groove on the inside diameter of the work, wherein a rod-shaped whetstone support made of a metal material is provided. And an inner layer grindstone portion attached to the peripheral surface of the grindstone support, and an outer layer grindstone portion that covers the peripheral surface of the inner layer grindstone portion, is integrated with the inner layer grindstone portion, and grinds a spline ball groove on the inner diameter of the work. A grinding wheel characterized by the following: 3. A method of dressing a grinding wheel, wherein the grinding wheel is inclined at a predetermined angle β ° with respect to the workpiece axis, and is axially moved in parallel with the workpiece axis to dress a grinding wheel for grinding a spline ball groove on the inner diameter of the workpiece. A dressing method for a grinding wheel, characterized in that the grinding wheel is axially moved while being inclined at a predetermined angle β °, and the dressing is performed while aiming at a center position of a rotary dresser having a general shape. 4. A method of dressing a grinding wheel, which is inclined at a predetermined angle β ° with respect to the workpiece axis and is axially moved in parallel with the workpiece axis to dress a grinding wheel for grinding a spline ball groove on the inner diameter of the workpiece. A first positioning step of axially moving the grinding wheel while being inclined at a predetermined angle β ° to abut one end of a dress groove having an arc-shaped cross section, and detecting the position; and a first positioning step. After detecting the dressing groove contact position of the grinding wheel, the grinding wheel is axially moved while being inclined at a predetermined angle β ° to contact the other end of the dressing groove, and the second position is detected. After the dressing position of the grinding wheel is detected by the second positioning process, the dressing groove contact position of the first positioning process and the second Of the positioning process A third positioning step of positioning the grinding wheel at an intermediate position from the contact position with the groove, and after the third positioning step, the grinding wheel is held at the intermediate position and brought into contact with the dress groove to bring the entire surface of the grinding wheel into contact. A dressing method for a grinding wheel, comprising: a dressing step of dressing. 5. A method of dressing a grinding wheel, wherein the grinding wheel is inclined at a predetermined angle β ° with respect to the workpiece axis, and is axially moved in parallel with the workpiece axis to dress a grinding wheel for grinding a spline ball groove on the inner diameter of the workpiece. A first positioning step of axially moving the grindstone while being inclined at a predetermined angle β ° to abut one end of a dress groove having a semicircular cross section, and detecting the position; and a first positioning step. After the dressing groove contact position of the grinding wheel is detected, the grinding wheel is axially moved to the dress groove approximate center point O where the vertical Z axis and the left and right Y axis intersect while tilting the grinding wheel at a predetermined angle β °. After setting the position of the grinding wheel in the positioning step and the second positioning step, the dressing is performed by moving the grinding wheel in the vertical or horizontal Y or Z axis direction while tilting the grinding wheel at a predetermined angle β °, and dressing the entire surface of the grinding wheel. Process and And a dressing method of a grinding wheel.