JP2888692B2 - Automatic device and method for shifting wheels of gear grinding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for automatically shifting a grinding wheel of a gear grinding machine capable of automatically shifting a grinding surface of a grinding wheel for grinding a workpiece at every grinding of at least one workpiece.

[0002]

2. Description of the Related Art Conventionally, in a gear grinding machine, the tooth surface of a gear is ground by a grindstone having a spiral blade surface. In this case, for example, after grinding about 100 gears with the same blade surface of the grindstone, the gear grinder is stopped, the grindstone is manually displaced, and the blade surface of the grindstone is shifted. In order to correct the phase, meshing teaching is performed, and the gear is ground again by the new blade surface of the grindstone set by the shift.

[0003]

However, the above-described conventional method of shifting the tooth flank of a grinding wheel has a disadvantage that an operator for shifting is required because the shifting is performed manually.

Further, since the timing and amount of shift of the grindstone depend on the experience of the operator, it cannot be said that the respective blade surfaces of the grindstone are uniformly used.

Further, since a large amount of work is continuously machined on the same blade surface of the grindstone, the machining accuracy of the work cannot be maintained immediately after the shift and immediately before the shift due to wear of the blade surface of the grindstone. There's a problem.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem. By automatically shifting the tooth surface of a grindstone at least for each grinding of at least one workpiece, the present invention has been made to solve the above problems. It is an object of the present invention to provide a wheel automatic shifting device and method for a gear grinding machine capable of using a tooth surface uniformly and improving the life of the wheel.

[0007]

In order to achieve the above object, a first aspect of the present invention is to grind a grinding surface of a grindstone after grinding at least one work so as to continue grinding with another work. A grinding wheel automatic shifting device of a gear grinding machine for shifting, the grinding wheel shifting means for shifting the grinding wheel by a predetermined shift amount in a predetermined shift direction, a shift position detecting means for detecting a shift position of the grinding wheel, the grinding wheel Shift range storage means for storing the range of the shift position, and comparing the shift position detected by the shift position detection means with the upper limit range and the lower limit range stored in the shift range storage means, wherein the shift position is When either of the upper limit range or the lower limit range is exceeded, a shift direction instructing means for instructing the shift direction to be reversed and a preset shift amount of the grinding wheel are stored. A shift amount storage unit, a shift direction instruction derived from the shift direction instruction unit, and a shift amount of the grindstone stored in the shift amount storage unit are read, and based on the read information, the grindstone shift unit is read. Means for controlling at least one grinding of at least one workpiece, and shifting by shifting the grinding wheel .
; And a correcting means for correcting the phase data of the workpiece and the grinding wheel, said correction means obtains a correction data by phase conversion on the basis of the shift amount to the number of revolutions of the grindstone, from said shift direction instructing means The correction data is added or subtracted with respect to the phase data based on the shift direction instruction, and the added or subtracted operation data is converted to a new phase data within a range of one pitch of the grinding wheel. I do.

[0008] Further, a second invention is a method for automatically shifting a grinding wheel of a gear grinding machine for shifting a grinding surface of a grinding wheel so as to continue a grinding process on another workpiece after grinding at least one workpiece. A first step of detecting a shift position of the grindstone by a shift position detecting means, and an upper limit or a lower limit of the shift position, wherein the shift position of the grindstone detected by the first step is stored in a shift range storage means. A second step of reversing the shift direction when any one of the ranges is exceeded; and a shift direction obtained by the second step and a shift amount of the grindstone stored in the shift amount storage means in at least one workpiece. A third step of reading each time of grinding, and controlling the wheel shift means based on the information read in the third step, And a fourth step of shifting the stone,
The workpiece before and displaced by shifting the grindstone
A fifth step of correcting the phase data of the grindstone, wherein the fifth step calculates the correction data by converting the shift amount into a phase based on the rotation speed of the grindstone.
And before reading in the third step
The phase data is corrected according to the shift direction of the grinding wheel.
A seventh step of performing an addition / subtraction operation on the data, and an eighth step in which the addition / subtraction operation data obtained in the seventh step is converted into a phase within a range of one pitch of the grinding wheel to obtain new phase data.
And the following steps.

[0009]

In the apparatus and method for automatically shifting a grinding wheel of a gear grinding machine according to the present invention, the shift position information of the grinding wheel detected by the shift position detecting means every time at least one workpiece is ground is stored in the shift range storage means. When the shift position exceeds the upper limit range or the lower limit range, the shift direction indicating means reverses the shift direction.

The control means reads the shift direction derived from the shift direction indicating means and the shift amount information of the grindstone stored in the shift amount storage means for each grinding of at least one workpiece, and applies the read information to each of the read information. The whetstone shift means for shifting the whetstone is controlled based on the wedge.

Accordingly, the range of the upper limit position and the lower limit position of the shift amount is automatically shifted for each grinding of at least one workpiece.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an automatic shifting device and method for a grinding wheel of a gear grinding machine according to the present invention.

FIG. 1 is a view showing the external structure of a gear grinding machine 10 embodying the present invention. The gear grinding machine 10 has a bed 12
The cutting table 14 is disposed on the upper surface of the
4 moves forward and backward in the direction of arrow A under the rotation of the cutting motor 16. The traverse table 18 disposed on the upper surface of the cutting table 14 moves forward and backward in a direction perpendicular to the arrow A direction, that is, in the arrow B direction under the rotation of the traverse motor 20.

On the traverse table 18, there are provided a work 22 consisting of gears and the like and a work sensor 24 consisting of a proximity switch for detecting the number of teeth of the rotating work 22 and generating a predetermined pulse. The work 22 rotates under the rotation of the work spindle motor 26.

On the other hand, a column 28 is arranged on the bed 12 in the direction of travel of the cutting table 14, and the turning table 30 is held on the column 28. The turning table 30 is turned in the direction of arrow C by a motor (not shown) provided in the column 28. The turning table 30 is further provided with a shift table 32, which is operated by a shift motor 34. Then, it moves in the direction of arrow D.

The shift motor 34 includes a first pulse generator 3
5 is attached, and the first pulse generator 35 is connected to the shift motor 3.
4 is detected.

As shown in FIG. 2, the grindstone spindle unit 36 includes a grindstone spindle motor 38 and a tool shaft 3 serving as a master rotated by the grindstone spindle motor 38.
9 is basically constituted by a second pulse generator 46 engaged with the wheel 9, and the grindstone 42 rotating under the action of the grindstone spindle motor 38 has a cylindrical shape, and a spiral groove is formed on the periphery thereof. .

Further, since the grinding wheel spindle unit 36 is attached to the shift table 32, the shift motor 3
4 is displaced in the direction of arrow D together with the shift table 32 under the rotating action of No. 4.

On the other hand, as shown in FIG. 3, the work 22 is removably supported on one end of a rotary shaft 48 via a pair of clamp jigs 50, and an electromagnetic clutch is mounted on the other end of the rotary shaft 48. A relatively large-diameter gear 54 is pivotally supported via 52. The gear 54 meshes with a gear 56 having a smaller diameter, and the gear 56 is supported by a shaft 58. A gear 57 is supported on the shaft 58, and the gear 57 is a gear 59 having a smaller diameter.
, And the gear 59 is supported by the shaft 61. One end of the shaft 61 is connected to a work spindle motor 26 via a coupling 60, and a third pulse generator 62 is attached to the work spindle motor 26. The other end of the shaft 61 is connected to the inertia damper 63.

In the gear grinding machine 10 configured as described above, the control for synchronizing the phases of the grinding wheel 42 and the work 22 is described in "NC Synchronization Control" in Japanese Patent Application Laid-Open No. 1-213702 already filed by the present applicant. The synchronization control method disclosed in "System" is used.

That is, as shown in FIG. 4, the output signal PG ₁ of the second pulse generator 46 is introduced to the feed forward calculator 68 via the quadruple counter 66 of the feed forward control unit 64. The calculation result of the feedforward calculator 68 is _{supplied to a} first input terminal of the adder 72 as a feedforward command signal _Sff via a D / A converter 70.

On the other hand, the speed data S _M of the tool shaft 39, which is the operation data of the feedforward operation unit 68, is introduced into the semi-closed loop operation unit 76 in the semi-closed loop control unit 74. In this case, an output signal PG ₂ is introduced from a third pulse generator 62 which is a rotary encoder axially mounted on the work spindle motor 26 to another input terminal of the semi-closed loop calculator 76 via a quadruple counter 78. ing. Based on the output signal PG ₂ , the semi-closed loop calculator 76 introduces the semi-closed loop command signal S _f2 via the D / A converter 80 to the second input terminal of the adder 72. The speed data S _S of the axis 61 serving as a slave, which is the output signal of the adder 72, controls the rotation speed of the work spindle motor 26 via the servo amplifier 82.

A sampling clock T _S obtained by dividing the oscillation frequency of a crystal oscillator (not shown) is introduced into the clock input terminal CK of the feedforward control unit 64 and the semi-closed loop control unit 74.

Next, an automatic shift circuit 88 for automatically shifting the grindstone 42 will be described with reference to FIG.

The automatic shift circuit 88 counts the output of the first pulse generator 35 attached to the shift motor 34 and detects a shift position, and a preset upper limit value of the shift amount of the grindstone 42. And a storage circuit 92 for storing the lower limit value and a signal indicating the shift position of the grindstone 42 output from the counter circuit 90 when the data is equal to or more than the upper limit value read from the storage circuit 92. An upper limit position detecting circuit 94 and a lower limit position detecting circuit for outputting a signal indicating the shift position of the grinding wheel 42 output from the counter circuit 90 when the data indicating the shift position is equal to or less than the lower limit value read from the storage circuit 92. 96 and a signal indicating the direction of shift of the grinding wheel 42 by a signal output from the upper limit position detection circuit 94 or the lower limit position detection circuit 96. Flip-flop circuit for outputting a signal (hereinafter, referred to as F / F) and a 98.

The automatic shift circuit 88 is based on a shift amount storage circuit 100 for storing a shift amount in advance, data indicating the shift direction output from the F / F 98, and a shift amount read from the shift amount storage circuit 100. Control circuit 10 for outputting a control signal for controlling shift motor 34
2 and a motor drive circuit 104 for driving the shift motor 34 by a control signal output from the control circuit 102.
And

Further, the automatic shift circuit 88 detects a signal indicating the number of teeth of the work 22 output from the work sensor 24 and a second rotation amount of the grinding wheel spindle motor 38.
From the A-phase pulse of the pulse generator 46 and the 0-point signal, the whetstone 42
A phase detection circuit 106 for detecting phase data of
Phase data for correcting the phase data output from the phase detection circuit 106 from the data indicating the direction of the shift output from the / F98, the shift amount read from the shift amount storage circuit 100, and the information indicating the module of the work 22. A correction circuit 108, an automatic meshing circuit 110 that outputs a meshing signal from an automatic meshing command and the corrected phase data output from the phase data correction circuit 108, a meshing signal output from the automatic meshing circuit 110, Second
An addition circuit 112 for adding the A-phase pulse output from the pulse generator 46, a synchronization control circuit 114 for generating a synchronization signal based on data output from the addition circuit 112,
A motor drive circuit 116 for driving the work spindle motor 26 based on the output of the synchronization control circuit 114;

The operation of grinding the work 22 and the grindstone 42 in phase by the gear grinding machine 10 configured as described above will be described with reference to FIGS.

First, the initial phase adjustment of the grindstone 42 and the work 22 is performed. The phase data obtained by the initial phase adjustment is used when a plurality of the same works 22 are continuously ground.

In the initial state, the work spindle motor 26 is rotating, but since the electromagnetic clutch 52 is deenergized (step S1), the work 22 is stopped, and the rotating shaft 48 of the work 22 is easily manually operated. (See FIG. 3). Next, the cutting motor 16
To advance the cutting table 14 (step S
2).

At this time, since the grindstone spindle motor 38 is inactive, the grindstone 42 stops rotating. Therefore, the operator engages the work 22 that has stopped rotating and the grindstone 42 to perform phase adjustment.

Next, the grindstone 42 is rotated by rotating the grindstone spindle motor 38 at a low speed (step S3).

In such a state, the A-phase pulse and the zero-point signal output from the second pulse generator 46 for detecting the rotation of the grinding wheel spindle motor 38 are input to the phase detection circuit 106, Counts the number N of A-phase pulses starting from the zero-point signal until a pulse is output from the work sensor 24 (step S).
4) (see FIG. 7), the number of pulses N is stored in the count memory circuit 107.

When the counting of the pulse number N of the A-phase is completed, the rotation of the grindstone spindle motor 38 is stopped (step S5), and the cutting motor 16 is energized so as to rotate in a direction opposite to that of step S2. The cutting table 14 is retracted, and the initial phase adjustment is completed (step S6).

Next, a process of automatically meshing the grindstone 42 and the work 22 using the pulse number N of the A-phase stored in the count memory circuit 107 at the time of the initial phase matching will be described with reference to the flowchart of FIG. This will be described with reference to FIG.

When the grindstone spindle motor 38 is energized in a state where the work 22 is attached, the work spindle motor 26 electrically connected to the grindstone spindle motor 38 is also driven, and the two enter a synchronous operation. Then, when the electromagnetic clutch 52 is energized (step S10), the work 22 rotates under the rotation of the work spindle motor 26 (step S11).

In this state, when the cutting motor 16 is energized, the cutting table 14 moves forward gradually (step S12), but before the work 22 and the grindstone 42 mesh with each other,
Once, the cutting motor 16 is deactivated. In the normal state, the work 22 is out of phase with the grindstone 42, and it is necessary to correct it.

Therefore, the phase detection circuit 106 counts the A-phase pulses until the output of the work sensor 24 starts from the zero point signal of the second pulse generator 46. Further, the phase detection circuit 106 compares the pulse number N ₁ which is counted counter memory circuit 107 this time and the stored number of pulses N on the said In step S4 (step S13), and pulse number N and the number of pulses N ₁ Are substantially equal, it is determined that there is no phase shift, a cutting command signal is sent, the cutting motor 16 is energized, and the cutting table 14 is moved forward (step S1).
4).

On the other hand, a signal relating to the equivalent value of the pulse number N and the pulse number N ₁ is introduced into the addition circuit 112 via the phase data correction circuit 108 and the automatic meshing circuit 110, and is output from the synchronization control circuit 114. Based on the synchronization signal, the motor drive circuit 116 operates the work spindle motor 26 synchronously to shift to a normal grinding process.

Now, when the stored pulse number N and pulse number N ₁ are not equal, this is because the grinding wheel 42 and the work 2
2 means that there is a phase shift. Then, the signal is introduced into the automatic meshing circuit 110 via the phase data correction circuit 108, and the signal is sent to the automatic meshing circuit 11 by the signal.
0 by introducing a correction signal to the adding circuit 112 from increasing or decreasing the combined rotational speed of the work spindle motor 26 to the pulse number N ₁ (step S15).

By repeating this, finally, the number of pulses N
Pulse number N ₁ of substantially equal values obtained for to eliminate the phase shift, thereafter, to the grinding wheel 42, so that the workpiece 22 keeps the same phase (see Fig. 9). In this case, the phase detection circuit 10
In 6, since a N ≒ N _1, the energization of cutting motor 16 cutting command signal is sent is made are the same as described above.

In this way, the initial phase adjustment and the phase shift are adjusted, and the work 22 is ground.
The operation of shifting the blade surface of the grindstone 42 when grinding a plurality of works 22 will be described with reference to the block diagram of the automatic shift circuit 88 shown in FIG. 5 and the flowchart of FIG.

When the grinding of the work 22 is completed (step S20), the control circuit 102 sets the shift amount storage circuit 1
It is determined whether the shift amount preset to 00 is “0” (step S21). When the shift amount is “0”,
Judge that the automatic shift mode of the grinding wheel is not selected,
The normal grinding mode is executed, but when the set shift amount is not “0”, for example, 100 μm, it is determined that the automatic grinding wheel shift mode is selected.

[0044] Then, it calculates the correction data P _P for correcting the phase difference between the grinding wheel 42 and workpiece 22 which is generated by shifting the grinding wheel 42 by the phase data correction circuit 108 (step S22).

P _P = P _G × (S _F / T _P ) = P _G × ｛S _F / (π × M
_O )｝ (1) In equation (1), P _G is the number of pulses output from the second pulse generator 46 attached to the grinding wheel spindle motor 38 when the grinding wheel 42 makes one rotation, and S _F is a setting. The shifted amount [mm], _TP is the pitch [mm] of the blade of the grindstone 42,
M _O indicates a module of the whetstone 42.

In this case, when the grinding wheel 42 makes one rotation from the phase detection circuit 106, the phase data correction circuit 108
Pulse number P _G that are output from the pulse generator 46, for example, with reading 18000 pulses, reads the shift amount stored in the shift amount storage circuit 100 S _F is 100 [mu] m, the grinding wheel from further not shown memory circuit 42 Module M _O , for example, 2.5,
These values are substituted into the equation (1) by obtaining the correction data P _P.

That is, the correction data P _P is as follows: P _P = 18000 × ｛0.1 / (π × 2.5)｝ ≒ 229 pulses. The correction data P obtained by this calculation
_P is used later when correcting the phase data.

Next, the counter circuit 90 outputs data indicating the shift position of the grindstone 42 read from the first pulse generator 35 disposed on the shift motor 34 to the upper limit position detection circuit 94 and the lower limit position detection circuit 96. When the upper limit position detecting circuit 94 is the data indicating the data indicating the upper limit position read from the storage circuit 92 to shift the position of the grinding wheel 42 exceeds <br/>, it outputs the upper limit position detection signal to the F / F98. Similarly, when the lower limit position detection circuit 96 detects that the shift position of the grindstone 42 has exceeded the lower limit position, it outputs a lower limit position detection signal to the F / F 98.

The F / F 98 is initially set so that, for example, a shift direction instruction signal for shifting the grindstone 42 in the plus direction is output.
4, the signal indicating the shift direction is inverted.

In this case, the shift direction of the grindstone 42 is plus in the vertically upward direction and minus in the vertically downward direction.

The phase data correction circuit 108 determines whether or not the shift direction is the plus direction based on the signal output from the F / F 98 (step S23). If the shift direction is positive, it is corrected by the correction data P _P determined by the number of pulses N is the phase data for automatic engagement of the workpiece 22 on the basis of the following equation (1) below (step S2
4).

That is, N = N + P _P (2)

The number of pulses N, which is the corrected phase data obtained by equation (2), and the number of pulses P _G output from the second pulse generator 46 when the grinding wheel 42 makes one rotation.
Comparing the door (step S25), and carry correction by the following equation if N ≧ P _G (step S26).

N = N−P _G (3) The phase data N corrected by the equation (3) is output from the phase data correction circuit 108 to the automatic meshing circuit 110, and outputs the amount of phase correction to the addition circuit 112. Adder circuit 112
Outputs the phase correction amount to the motor drive circuit 116 in synchronization with the synchronization signal output from the synchronization control circuit 114,
The motor drive circuit 116 controls the number of revolutions of the work spindle motor 26 based on the phase correction amount to make the phases of the work 22 and the grindstone 42 coincide.

On the other hand, the control circuit 102 reads the output of the F / F 98 indicating that the shift direction indicates the plus direction, reads information indicating that the shift amount S _F is 100 μm from the shift amount storage circuit 100, and outputs these signals to the motor drive. Circuit 10
4 is output. The motor drive circuit 104 drives the shift motor 34 based on the shift direction and the shift amount S _F , and the grindstone 42 is shifted by the rotation of the shift motor 34 (step S27).

[0056] In the step S25, when it is not N ≧ P _G, i.e., corrected phase data N is second
When a number of pulses less than P _G per rotation of the grinding wheel 42 that is output from the pulse generator 46, the carry correction in step S26 is to execute the step S27 for unnecessary.

In step S27, F / F 98
The control circuit 102 determines whether or not the shifted grinding wheel 42 has exceeded the usable upper limit position by reading the output (step S28), and if so, sets the signal indicating the next shift direction to minus (step S28). S29),
Start grinding. In step S28, if the shift in the plus direction does not exceed the upper limit position, the gear is ground based on the information without reversing the shift direction of the grindstone 42.

In step S23, when the shift direction is not plus, that is, when the output of the F / F 98 indicating the shift direction is minus, the phase data correction circuit 108 controls the automatic engagement of the workpiece 22. The phase data N is corrected data P obtained by the above equation (1).
Correct by _P (step S31).

N = N−P _P (4) Next, it is determined whether or not the corrected phase data N is less than “0” (step S32). If N <0, borrow correction is performed based on the following equation. (Step S33).

N = N + P _G (5) The phase data N corrected by the equation (5) is output from the phase data correction circuit 108 to the automatic meshing circuit 110 in the same manner as in step S26, and the phase correction amount is added. Output to the circuit 112. The addition circuit 112 is a synchronous control circuit 11
The phase correction amount is output to the motor drive circuit 116 in synchronization with the synchronization signal output from the motor drive circuit 11.
6 controls the number of rotations of the work spindle motor 26 on the basis of the phase correction amount so that the work 22 and the grindstone 4 are controlled.
2 and the phase are matched.

On the other hand, F indicating that the shift direction is a minus direction
The control circuit 102 that has read the output of the / _F 98 reads information having a shift amount SF of 100 μm from the shift amount storage circuit 100, and outputs these signals to the motor drive circuit 104. The motor drive circuit 104 drives the shift motor 34 based on the respective data. The grindstone 42 is shifted under the rotation of the shift motor 34 (step S
34).

If N <0 in step S32, step S34 is executed.

In step S34, F / F 98
The control circuit 102 determines whether or not the shifted whetstone 42 has exceeded the usable lower limit position by reading the output of step S35 (step S35), and if so, sets the signal indicating the next shift direction to plus (step S35). S36) The grinding process is started. In step S35, if the shift in the minus direction does not exceed the upper limit position, the gear is ground based on the information without reversing the shift direction of the grindstone 42.

As described above, in the present embodiment, the grinding wheel 4 read from the F / F 98 by the control circuit 102 is used.
2 and a signal indicating the shift direction, and a shift amount storage circuit 100.
The shift motor 34 is driven based on the shift amount S _F read out from the control unit 30. The shift motor 34 is a shift table 3
2 is displaced, the whetstone 42 attached to the shift table 32 shifts.

Further, the upper limit position detection circuit 94 outputs a signal for reversing the shift direction when the displacement of the shift motor 34 read from the counter circuit 90 exceeds the upper limit value of the shift range read from the storage circuit 92. I do. The lower limit position detecting circuit 96 is provided with the upper limit position detecting circuit 94.
Similarly, when the displacement of the shift motor 34 read from the counter circuit 90 exceeds the lower limit of the shift range read from the storage circuit 92, it is detected that the grinding wheel 42 has reached the lower limit of the shift range, and the shift direction is determined. The signal for inverting is output. Therefore, the whetstone 42 can be uniformly shifted in the range from the usable upper limit position to the usable lower limit position.

Since the phase difference between the grinding wheel 42 and the workpiece 22 generated when shifting the grinding wheel 42 is corrected by the phase data correction circuit 108 and the like, the initial phase adjustment at the time of shifting is not required.

[0067]

According to the apparatus and method for automatically shifting a grinding wheel of a gear grinding machine according to the present invention, the range of the upper limit position and the lower limit position of the shift amount is automatically shifted every time at least one workpiece is ground.

Accordingly, an operator for shifting the grindstone is not required, the number of personnel can be reduced, and the shift can be performed while securing the accuracy of the phase data between the grindstone and the work. Can be planned.

Further, since the plurality of blade surfaces of the grindstone are used uniformly without bias, the life of the grindstone can be improved, the frequency of replacement of the grindstone can be suppressed, and the productivity of the gear grinding machine can be reduced. There is an effect that it can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an external configuration of a gear grinding machine that implements an automatic whetstone shifting device for a gear grinding machine according to the present invention.

FIG. 2 is an explanatory diagram showing a correlation between a grindstone and a work shown in the embodiment of FIG.

FIG. 3 is an explanatory diagram showing a correlation between a work, a pulse generator, and a work spindle motor for driving them in the embodiment shown in FIG. 1;

FIG. 4 is a block diagram of the synchronization control circuit of the embodiment shown in FIG. 1;

FIG. 5 is a block diagram of the automatic shift circuit of the embodiment shown in FIG. 1;

FIG. 6 is a flowchart of an initial phase adjustment of the embodiment shown in FIG. 1;

FIG. 7 is a time chart of an initial phase adjustment of the embodiment shown in FIG. 1;

FIG. 8 is a flowchart of the automatic engagement of the embodiment shown in FIG.

FIG. 9 is a time chart for automatic engagement of the embodiment shown in FIG. 1;

FIG. 10 is a flowchart illustrating an automatic shift operation of the embodiment shown in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Gear grinder 12 ... Bed 14 ... Cut table 16 ... Cut motor 18 ... Traverse table 20 ... Traverse motor 22 ... Work 24 ... Work sensor 26 ... Work spindle motor 32 ... Shift table 34 ... Shift motor 35 ... First Pulse generator 38 Grinding wheel spindle motor 42 Grinding stone 46 Second pulse generator 62 Third pulse generator 90 Counter circuit 92 Storage circuit 94 Upper limit position detection circuit 96 Lower limit position detection circuit 98 Flip-flop circuit (F / F) 100: shift amount storage circuit 102: control circuits 104, 116: motor drive circuit 108: phase data correction circuit

Continuation of the front page (56) References JP-A-60-177817 (JP, A) JP-A-60-114425 (JP, A) JP-A-57-184624 (JP, A) JP-A-3-212705 (JP) , A) Jikken 46-24558 (JP, Y1) (58) Field surveyed (Int. Cl. ⁶ , DB name) B23F 1/00-23/12

Claims (2)

(57) [Claims] A grinding wheel automatic shifting device for a gear grinding machine for shifting a grinding surface of a grinding wheel so as to continue a grinding process on another workpiece after grinding at least one workpiece, wherein the grinding wheel is moved to a predetermined position. Whetstone shifting means for shifting by a predetermined shift amount in a shift direction; shift position detecting means for detecting a shift position of the whetstone; shift range storage means for storing a range of shift positions of the whetstone; and the shift position detecting means Is compared with the upper limit range and the lower limit range stored in the shift range storage means, and when the shift position exceeds either the upper limit range or the lower limit range, a shift direction reversal instruction is issued. Shift direction instructing means for performing, a shift amount storing means for storing a preset shift amount of the grindstone, Control means for reading a shift direction instruction and a shift amount of the grindstone stored in the shift amount storage means, and controlling the grindstone shift means for each grinding of at least one workpiece based on the read information. , the workpiece before and displaced by shifting the grindstone
; And a correcting means for correcting the phase data serial grindstone, the correcting means obtains the correction data and phase terms based on the shift amount of the rotational speed of the grinding wheel, the shift direction from the shift direction instructing means Gear grinding, wherein the correction data is added or subtracted from the phase data based on the instruction of the above, and the added or subtracted operation data is converted into a phase within a range of one pitch of the grinding wheel to obtain new phase data. Machine automatic shift device for grinding wheels. 2. A method for automatically shifting a grinding wheel of a gear grinding machine for shifting a grinding surface of a grinding wheel so as to continue a grinding process on another workpiece after grinding at least one workpiece, comprising: a first step of detecting a shift position of the grinding wheel, either the upper range or the lower limit range of the shift position where the shift position of the grinding wheel detected by said first step is stored in the shift range storage means When it exceeds
A second step of reversing the shift direction, and a third step of reading the shift direction obtained in the second step and the shift amount of the grindstone stored in the shift amount storage means for each grinding of at least one workpiece. When the third controls the grinding wheel shifting means based on the respective information read in step, a fourth step of shifting said grinding wheel, said grinding wheel the workpiece before and displaced by shifting the
A fifth step of correcting the phase data of the grindstone, wherein the fifth step is a sixth step of converting the shift amount into a phase based on the rotation speed of the grindstone to obtain correction data, Shift of the grinding wheel read in the third step
A seventh step of adding or subtracting the phase data with the correction data in accordance with a direction; and adding and subtracting the addition and subtraction operation data obtained in the seventh step within a range of one pitch of the grindstone to obtain a new one. And an eighth step of converting the phase data into a phase data.