JPH09207067A - Dressing method for gear grinding wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the accuracy of tooth profile of a ground tooth face by positioning a gear grinding wheel and a dressor when a clearance space becomes a fixed quantity, and carrying out dressing on the gear grinding wheel. SOLUTION: A grinding wheel 12 is normally and reversely rotated, and then a clearance space between the ground tooth face 20 of the grinding wheel 12 and the tooth face of a dressor 24 is computed, and after the dressor 24 is reversely rotated as far as a half of the clearance space, the dressor 24 is advanced toward the grinding wheel 12 as far as fixed quantity. In the case where the clearance space is judged to be less than the fixed quantity, a controller 16 reversely rotates the grinding wheel 12 in a direction designated by an arrow D, and after detecting that the L tooth face of the dressor 24 has come into contact with the one ground tooth face 20 of the grinding wheel 12, the one ground tooth face 20 is dressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for dressing a grinding wheel for gear grinding having a screw-shaped grinding tooth surface.

[0002]

2. Description of the Related Art Conventionally, there has been known a gear grinding machine in which a grinding wheel for gear grinding is rotatably mounted in order to finish grinding a gear. This grinding wheel for gear grinding is generally a metal grinding wheel base material on the surface of which a thread-shaped grinding tooth surface is precisely finished by a screw grinder or the like, and a cemented carbide grain (for example, C
It is formed by electrodeposition of BN abrasive grains) via a plating layer.

[0003]

By the way, when dressing the above-mentioned grinding wheel for gear grinding with a gear-shaped dresser, the grinding teeth dressed by the meshing condition between the grinding tooth surface of the grinding wheel for gear grinding and the tooth surface of the dresser. There may be a case where an uneven tooth profile is formed on the surface, and as a result, the abrasive grains wear and the durability of the grinding wheel for gear grinding deteriorates.

The present invention has been made in order to overcome the above-mentioned inconvenience, and it is possible to improve the tooth profile accuracy of a grinding tooth surface and prevent abrasion of abrasive grains to improve durability. An object of the present invention is to provide a dressing method for a grinding stone.

[0005]

To achieve the above object, the present invention is a method for dressing the grinding tooth surface of a grinding wheel for gear grinding having a grinding tooth surface for grinding a gear. After the grinding tooth surface of the grinding wheel and the tooth surface of the gear-shaped dresser are engaged with each other to fix the dresser, the grinding wheel for gear grinding is rotated in a predetermined direction with respect to the dresser, and the grinding wheel for gear grinding A first step of bringing one of the grinding tooth surfaces into contact with one of the tooth surfaces of the dresser, and rotating the gear grinding wheel in the opposite direction to the first step, and the other grinding tooth of the gear grinding wheel. A second step of bringing a surface into contact with the other tooth surface of the dresser, and separating one tooth surface of the dresser from one grinding tooth surface of the gear grinding wheel based on the amount of rotation of the gear grinding wheel. Third step of detecting the interval t, and before the fixed state Spaced with respect to gear grinding stone interval t /
After rotatably displacing the dresser by 2, the dresser and the grinding wheel for gear grinding are relatively moved by a predetermined amount to bring the tooth surface of the dresser and the grinding tooth surface of the grinding wheel for gear closer to each other. Steps and the first to fourth steps are sequentially repeated, the grinding wheel for dressing gears and the dresser are positioned when the separation distance t reaches a predetermined amount, and the positioned state is maintained and the aforesaid state is maintained. The gear grinding wheel is dressed while the gear grinding wheel and the dresser are synchronously rotated.

In this case, in the first step, after the gear grinding wheel is fixed, the dresser is rotated in a predetermined manner with respect to the gear grinding wheel so that one tooth surface of the dresser is used for gear grinding. In contact with one grinding tooth surface of the grindstone, in the second step, the dresser is rotated in the direction opposite to that in the first step, and the other tooth surface of the dresser is the other grinding tooth surface of the gear grinding wheel. In the third step, the separation interval t may be detected based on the rotation amount of the dresser.

According to the present invention, the first step to the fourth step are sequentially and continuously repeated, and when the separation distance t reaches a predetermined amount, the gear grinding wheel and the dresser are in a state of nearly no backlash. Is engaged and positioned, and the dresser starts dressing processing for the grinding wheel for gear grinding while maintaining the positioned state.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION A dressing method for a grinding wheel for gear grinding according to the present invention will be described in detail below with reference to the accompanying drawings, with reference to preferred embodiments in connection with a dressing apparatus for carrying out the method. .

In FIG. 1, reference numeral 10 indicates a dressing device for a grinding wheel for gear grinding, which dressing device 10 is provided so as to be movable along an axial direction (direction of arrow A or arrow B). 12 (hereinafter, simply referred to as a whetstone 12), a whetstone drive motor 14 for rotating the whetstone 12 in the direction of arrow C or arrow D in the forward or reverse direction about the axis of the whetstone 12, and the whetstone drive motor 14. And a first pulse generator 18 for deriving a predetermined number of pulses corresponding to the rotation angle to the controller 16.

Further, the dressing device 10 includes an involute tooth surface 2 which meshes with the grinding tooth surface 20 of the grindstone 12.
A dresser 24 having a gear shape having two (hereinafter, simply referred to as a tooth surface 22) and the dresser 2 via a gear train 26.
4, a controller for controlling a dresser drive motor 28 that rotates in the direction of arrow E or arrow F about the axis of the dresser 24 as a center of rotation and a predetermined number of pulses corresponding to the rotation angle of the dresser drive motor 28. 16
And a second pulse generator 30 which is derived from the above.

The dresser 24 is the grinding tooth surface 20 of the grindstone 12.
For tooth dressing, and the tooth surface 22 is made up of irregularities.
And, for example, diamond abrasive grains are electrodeposited on the tooth bottom (not shown) via a nickel plating layer. The dresser 24 is rotated in the forward and reverse directions by a dresser drive motor 28 that is synchronously controlled with the grindstone drive motor 14.

The gear train 26, the dresser drive motor 28, and the second pulse generator 30 are fixedly mounted on a table 32, and the table 32 is displaceably provided under the driving action of a table moving drive motor 34. That is, the table moving drive motor 34
The dresser 24 is moved in the direction of the arrow G or the arrow H by displacing the table 32 by driving, so that the tooth surface 22 of the dresser 24 can be moved toward or away from the grinding tooth surface 20 of the grindstone 12.

Incidentally, the grinding wheel drive motor 14, the dresser drive motor 28, and the table moving drive motor 34.
Are preferably stepping motors each having a high resolution. The controller 16 has a counter, a D / A converter, an adder, a feedforward arithmetic unit, a semi-closed loop arithmetic unit, and the like, which are not shown, as constituent elements, and the details thereof are disclosed in JP-A-5-345222 proposed by the present applicant. It is recommended to refer to the official gazette.

The dressing apparatus 10 to which the dressing method for a grinding wheel for gear grinding according to the present invention is applied is basically constructed as described above, and the dressing method will be described with reference to the flow chart shown in FIG. explain. Note that the dressing is not performed on both grinding tooth flanks 20 adjacent to each other of the grinding wheel 12 at the same time, but after dressing one grinding tooth flank 20 on the other grinding tooth flank 2
Grinding tooth flank 20 on one side such as dressing 0
Shall be carried out for each.

First, a method of adjusting the meshing condition between the grinding tooth surface 20 of the grindstone 12 and the tooth surface 22 of the dresser 24 will be described.

By engaging the grinding tooth surface 20 of the grindstone 12 and the tooth surface 22 of the dresser 24 with each other, a dresser insertion position as shown in FIG. 4A is formed (step S1,
S2).

Subsequently, the dresser 24 is fixed by urging a clamp means (not shown), and the dresser 24 is retracted from the state shown in FIG. 12 and the dresser 24 reach the detection mode start position shown in FIG. 4B (steps S3 and S4). The dresser 24 is shown in FIG.
Retracting from A to the position shown in FIG. 4B prevents the grinding tooth surface 20 of the grindstone 12 and the tooth surface 22 of the dresser 24 from coming into contact with each other by fixing the dresser 24 via the clamp means. This is because.

At the detection mode start position, the first detection mode (step S5) is executed according to the subroutine shown in FIG. Hereinafter, the detection mode will be described in detail.

With the dresser 24 fixed,
As shown in FIG. 5A, by rotating the grindstone 12 in the direction of arrow C about the axis of rotation under the driving action of the grindstone driving motor 14, the grinding tooth surface 20 of the grindstone 12 and the R tooth surface of the dresser 24 are rotated, as shown in FIG. 5A. And 36 (step a). In FIG. 5A, reference numeral 38 indicates the grinding tooth surface 2
The contact point between 0 and the R tooth surface 36 is shown.

In this case, the controller 16 samples the pulse output from the first pulse generator 18 in a predetermined cycle, and the amount of change of the obtained sampling pulse is substantially zero and becomes a constant state, so that the controller 16 is normally rotated. Whetstone 1
It is detected that the second grinding tooth surface 20 contacts the R tooth surface 36 of the dresser 24 (step b). When the grinding tooth surface 20 of the grindstone 12 contacts the R tooth surface 36 of the dresser 24, the rotation of the grindstone 12 is stopped, and the output of the pulse from the first pulse generator 18 is stopped.

Next, by rotating the grindstone 12 in the direction of arrow D under the driving action of the grindstone drive motor 14 from the state of step a, as shown in FIG. 5B, the grinding tooth surface 20 of the grindstone 12 and the dresser 12 are removed. The L tooth surface 40 of 24 comes into contact (step c). The contact between the grinding tooth surface 20 of the grindstone 12 and the L tooth surface 40 of the dresser 24 is detected by the controller 16 monitoring the amount of change of the sampling pulse as described above (step d). In FIG. 5B, reference numeral 42 indicates the grinding tooth surface 2
The contact point between 0 and the L tooth surface 40 is shown.

In this case, a predetermined number of pulses corresponding to the amount of rotation of the grinding wheel drive motor 14 from the state in which the grinding tooth surface 20 of the grindstone 12 is in contact with the R tooth surface 36 of the dresser 24 to the contact with the L tooth surface 40. Is introduced into the controller 16 via the first pulse generator 18, and the controller 16
By counting the number of pulses, the separation distance t between the grinding tooth surface 20 of the grindstone 12 and the L tooth surface 40 of the dresser 24 is t.
Is detected (see FIG. 5B).

Then, the dresser drive motor 28 is driven to position the dresser 24 in the direction of the arrow F so that the tooth portion 44 of the dresser 24 is located at the central portion between the grinding tooth surfaces 20 adjacent to each other of the grindstone 12. Rotate and move by a fixed amount. That is, the grinding tooth surface 20 of the grindstone 12 and the R tooth surface 3 of the dresser 24.
The dresser 24 is reversed in the direction of arrow F by a predetermined amount (separation interval t / 2) so that the separation distance between the grinding tooth surface 20 and the L tooth surface 40 becomes equal to each other (step e).

In this case, the controller 16 obtains data corresponding to the separation distance t / 2 by converting the number of pulses, which is half the number of pulses corresponding to the detected separation distance t, into the rotation amount of the dresser 24. .

Subsequently, between the grinding tooth surface 20 of the grindstone 12 and the R tooth surface 36 of the dresser 24, and between the grinding tooth surface 20 and L.
While maintaining the same spacing between the tooth surface 40 and FIG.
As shown in C, the table moving drive motor 34 is stepwise fed to advance the table 32 in the direction of arrow G by a predetermined length (step f). Therefore, the dresser 24 approaches the grindstone 12 side by a predetermined length, and the grindstone 12 and the dresser 24 reach the phase teaching position as shown in FIG. 4C (step S6).

At the phase teaching position, the second detection mode is performed along the steps shown in FIG. 3 (step S
7). Since the detection mode has been described above, detailed description thereof will be omitted.

FIG. 6 shows the relationship between the number of pulses sampled from the pulses output from the first and second pulse generators 18 and 30 and time.
The solid line in FIG. 6 indicates the amount of rotational displacement of the grindstone 12 in units of the number of pulses indicated on the vertical axis on the left side in FIG. 6, and the broken line indicates the pulse on the vertical axis on the right side in FIG. The amount of rotational displacement of the dresser 24 in units of numbers is shown.

Further, in FIG. 6, O, Q and U are grindstones 1.
2 shows the contact point where the grinding tooth surface 20 of No. 2 and the R tooth surface 36 of the dresser 24 are in contact, and P, S, V and W are the grinding tooth surface 2
0 and the L tooth surface 40 of the dresser 24 contact each other.

In the second detection mode (step S7), the grindstone 12 is rotated in the normal and reverse directions with the dresser 24 fixed at the phase teaching position, and the separation interval t is determined from the deviation between the contact point O and the contact point P. Can be read to be about 5000 pulses. The controller 16 converts the number of pulses into the rotation amount of the dresser 24, and the dresser drive motor 28
The dresser 24 is rotated in the direction of the arrow F by the separation distance t / 2 under the urging action of. In this way, after the tooth portion 44 of the dresser 24 is rotationally moved to the central portion of the adjacent grinding tooth surface 20 of the grindstone 12, the dresser 24 is advanced toward the grindstone 12 side (arrow G direction) by a predetermined amount. The predetermined amount is data obtained by an experiment so that the number of pulses corresponding to the separation interval t is less than 500 pulses, and this data is stored in the controller 16 as a table.

Next, the third detection mode is performed along the same steps as described above (step S8). That is, the grindstone 12 is rotated in the forward and reverse directions, and the grinding tooth surface 2 of the grindstone 12 is rotated.
0 and the distance t between the contact points Q and S between the R tooth surface 36 and the L tooth surface 40 of the dresser 24 are calculated to calculate the spacing t.
4 is reversed in the direction of arrow F by a separation distance t / 2, and then the dresser 24 is advanced by a predetermined amount toward the grindstone 12 side (direction of arrow G).

By the end of the third detection mode, the grindstone 12 and the dresser 24 reach the dressing start position as shown in FIG. 4D. At the dressing start position, the grindstone 12 and the dresser 24 are meshed with each other in a state close to no backlash except for backlash in the gear train 26.

At the dressing start position, the controller 16 determines whether the separation distance t between the grindstone 12 and the dresser 24 is less than a predetermined amount (step S9), and the separation distance t reaches less than the predetermined amount. If it is determined that the distance t is less than the predetermined amount, the process returns to step S7. If it is determined that the distance t is less than the predetermined amount, the process proceeds to step S10. Note that step S9 substantially functions as the fourth detection mode, and the separation interval t is detected during the detection mode.

That is, the controller 16 uses the grindstone 12
Is rotated normally and reversely, the number of pulses relating to the deviation (separation interval t) between the contact point U and the contact point V is counted, and it is determined whether or not the counted number of pulses is a predetermined amount, for example, less than 300 pulses. .

When the controller 16 determines that the number of pulses corresponding to the distance t detected in step S9 is less than the predetermined amount, the controller 16 reverses the grindstone 12 in the direction of arrow D to form the L tooth surface of the dresser 24. After detecting that 40 is in contact with one grinding tooth surface 20 of the grindstone 12 (see contact point W in FIG. 6), the dressing operation for the one grinding tooth surface 20 is started (step S10, S1
1). In step S10, the controller 16 performs a correction operation of reversing the dresser 24 by a predetermined amount based on the correction data obtained by the experimental value in advance.

The controller 16 uses the grindstone drive motor 1
4 and the dresser drive motor 28 derive an urging signal and drive them together, and the dressing work is performed on one of the grinding tooth surfaces 20 of the grindstone 12 under the rotating action thereof. At that time, the controller 16 performs drive control so that the grindstone drive motor 14 and the dresser drive motor 28 rotate synchronously.

In this case, the grindstone drive motor 14 and the dresser drive motor 28 protect the abrasive grains of the grindstone 12 and the abrasive grains of the dresser 24, so that they rotate at a low speed and have a low torque based on the motor characteristics described later. Driven by.

When the other grinding tooth surface 20 of the grindstone 12 is dressed after the dressing work on the one grinding tooth surface 20 of the grindstone 12 is completed, the rotating directions of the grindstone 12 and the dresser 24 are opposite to each other. The other points are different, and the other points are performed through the same steps from step S1 to step S11.

A characteristic diagram of the grindstone drive motor 14 is shown in FIG. In FIG. 7, a characteristic curve M represents the relationship between the number of pulses derived from the first pulse generator 18 to the controller 16 and time. In the grindstone drive motor 14, the grinding tooth surface 20 of the grindstone 12 is dresser 24.
(-1500) when idling without contacting the R tooth surface 36 of
When the grinding tooth surface 20 of the grindstone 12 and the R tooth surface 36 of the dresser 24 come into contact with each other in a constant state where the amount of change is substantially zero around the pulse, the amount of change is almost zero again around the (-5000) pulse. It has the characteristic of being in a constant state.

The characteristic curve N represents the relationship between the number of deviation pulses sampled at a predetermined frequency and time, and the grinding tooth flank 2 of the grindstone 12 corresponds to the characteristic curve M.
When 0 and the R tooth surface 36 of the dresser 24 come into contact with each other, the deviation pulse number becomes a value close to 0. The dresser drive motor 28 has the same motor characteristics as the grindstone drive motor 14.

In this embodiment, the grinding tooth surface 2 of the grindstone 12 is
0 and the tooth flank 22 of the dresser 24 are positioned and meshed in a state close to no backlash, and the dressing is performed for each grinding flank 20 on one side while maintaining the above state. It is possible to improve the tooth profile accuracy of the dressed ground tooth surface 20 without forming an uneven tooth profile, for example, a tooth profile waviness.

Further, the dressing is performed in a state where the engagement between the grindstone 12 and the dresser 24 is adjusted appropriately,
Wear of the abrasive grains can be prevented and the durability of the grindstone 12 can be improved.

In this embodiment, the dresser 2 is used in advance.
The 4 side is fixed, and the grindstone 12 side is rotated forward and reverse to position the meshing state of the grindstone 12 and the dresser 24. However, the invention is not limited to this, and the grindstone 12 side is fixed in advance, It is also possible to rotate the dresser 24 side in the forward and reverse directions to position the meshed state.

[0043]

According to the present invention, the following effects can be obtained.

That is, since the spacing t between the tooth flank of the grinding wheel for gear grinding and the tooth flank of the dresser is set to a predetermined amount in advance and the dressing process is started, the dressing-processed tooth flank is Tooth profile accuracy is improved.

Further, since the dressing is performed in a state where the engagement between the grindstone and the dresser is adjusted appropriately, abrasion of the abrasive grains can be prevented and the durability of the grindstone can be improved.

[Brief description of drawings]

FIG. 1 is a schematic view of a dressing device for carrying out a dressing method for a grinding wheel for gear grinding according to the present invention.

FIG. 2 is a flowchart showing a dressing method of a grinding wheel for gear grinding according to the present invention.

FIG. 3 is a subroutine showing a detection mode in FIG.

FIG. 4A to FIG. 4D are schematic operation explanatory views showing a meshing state between a grinding wheel for gear grinding and a dresser.

5A to 5C are schematic operation explanatory views showing a meshing state of a grinding wheel for gear grinding and a dresser in a detection mode.

FIG. 6 is an explanatory view showing a rotational displacement amount of a grinding wheel for gear grinding and a dresser and showing a relationship between the number of sampled pulses and time.

FIG. 7 is a characteristic diagram of a motor included in the dressing device shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Dressing device 12 ... Grinding wheel 14 ... Grinding wheel drive motor 16 ... Controller 18, 30 ... Pulse generator 20 ... Grinding tooth surface 22 ... Involute tooth surface 24 ... Dresser 26 ... Gear train 28 ... Dresser drive motor 32 ... Table 34 ... Drive motor for table movement 36 ... R tooth surface 38, 42 ...
Contact point 40 ... L tooth surface 44 ... Tooth portion

Front Page Continuation (72) Inventor Takashi Kaneko 1-10-1 Shin-Sayama, Sayama City, Saitama Prefecture Honda Engineering Co., Ltd.

Claims (2)

[Claims] 1. A method of dressing the grinding tooth surface of a gear grinding wheel having a grinding tooth surface for grinding a gear, wherein a grinding tooth surface of the gear grinding wheel and a tooth surface of a gear-shaped dresser are provided. After meshing and fixing the dresser, the grindstone for gear grinding is rotated in a predetermined direction with respect to the dresser to bring one grinding tooth surface of the grindstone for gear grinding into contact with one tooth surface of the dresser. A first step, and a second step of rotating the gear grinding wheel in the opposite direction to the first step to bring the other grinding tooth surface of the gear grinding wheel into contact with the other tooth surface of the dresser; A third step of detecting a separation distance t between one tooth surface of the dresser and one grinding tooth surface of the gear grinding wheel based on a rotation amount of the gear grinding wheel; and the fixed gear. Distance t from the grinding wheel
After rotationally displacing the dresser by / 2, move the dresser and the grinding wheel for gear grinding relatively by a predetermined amount to bring the tooth surface of the dresser and the grinding tooth surface of the grinding wheel for gear grinding closer to each other. 4 steps and the 1st to 4th steps are sequentially and continuously repeated to position the wheel for grinding the gear and the dresser when the separation distance t reaches a predetermined amount, and hold the positioned state. A dressing method for a grinding wheel for gear grinding, wherein dressing is performed on the grinding wheel for gear grinding while rotating the grinding wheel for gear grinding and the dresser synchronously. 2. The method according to claim 1, wherein, in the first step, after fixing the grinding wheel for gear grinding, the dresser is rotated in a predetermined manner with respect to the grinding wheel for gear grinding. The tooth surface is brought into contact with one grinding tooth surface of the gear grinding wheel, and in the second step, the dresser is rotated in the opposite direction to the first step, and the other tooth surface of the dresser is used for the gear grinding. A method for dressing a grinding wheel for gear grinding, which is characterized in that the grinding wheel is brought into contact with the other grinding tooth surface of the grinding wheel, and in the third step, the separation distance t is detected based on the rotation amount of the dresser.