JPH0623620A - Method and device for modifying phase of gear grinding machine - Google Patents

Abstract

PURPOSE:To provide a method and device for modifying the phase of a gear grinding machine to improve grinding precision and prevent imperfect grinding by modifying the rotational phase of a gear to be ground next in accordance with the modified value of a grinding amount input by an operator when imperfect grinding occurs on the ground gear. CONSTITUTION:A synchronous control circuit 64 contains a keyboard 86 to input the modified value S of a grinding amount, a phase modified value arithmetic circuit 88 to process the modified value PF of a phase from the modified value S of the grinding amount and a modified value output circuit 90 to output the modified value of the phase, so that the rotational phase of a work spindle motor 26 rotated in synchronization with a grinding wheel spindle motor 38 can be modified by modifying rotational data for the grinding wheel spindle motor 38 output from a four-multiplication counter 66 in accordance with the modified value PF of the phase output from the modified value output circuit 90.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a phase correcting method and apparatus for a gear grinding machine, which corrects the phase between a grinding tool controlled in synchronous rotation and a gear to be ground, and more particularly to an input grinding amount. The present invention relates to a method and apparatus for correcting a phase of a gear grinding machine, which can correct the rotational phase of a gear to be ground subsequently processed by the correction value of.

[0002]

2. Description of the Related Art Conventionally, there has been used a gear grinding machine, for example, a grinding wheel and a gear to be ground are meshed with each other and the gear to be ground is ground by the grinding tool. In this case, the spindle motor that rotates the grinding tool and the work spindle motor that rotates the gear to be ground are synchronously controlled.

In such a gear grinding machine, the technical idea of detecting the eccentricity of the gears, automatically correcting the phase and performing accurate grinding and improving the grinding efficiency is disclosed in Japanese Patent Publication No. 62-62-. It is disclosed in the invention "meshing device" of No. 34489.

[0004]

By the way, in the meshing device of the prior art, the rotating action of the work spindle motor is transmitted to the gear to be ground through a gear train composed of a plurality of gears. Then, a backlash occurs due to a gear accuracy error and a gear assembly accuracy error (hereinafter referred to as a friction error).

Due to this friction error, the phase data of the gear to be ground output from the control circuit and the actual phase are different, the grinding accuracy is lowered, and a spot of insufficient grinding occurs. However, there is a problem in that grinding residue such as remains is generated.

The present invention has been made to solve such a conventional problem, and when a grinding residue is generated in a ground gear to be ground, a correction value of a grinding amount input by an operator. Based on the above, it is possible to improve the grinding accuracy by correcting the rotational phase of the gear to be ground next to be ground, and to provide a phase correcting method and device for a gear grinding machine that can prevent unground grinding. To aim.

Further, by rapidly correcting the rotational phase of the gear to be ground, the cycle time for processing the gear to be ground can be shortened and the productivity can be improved. The purpose is to provide.

[0008]

In order to achieve the above object, a first aspect of the present invention is a correction value of a grinding amount which is input as a rotation phase between a grinding tool and a gear to be ground which are synchronously controlled. A method of correcting a phase of a gear grinding machine, which comprises:
A first step of reading the input correction value of the grinding amount, a second step of reading preset data relating to the shape of the gear to be ground, a correction value of the grinding amount, and the grinding target A third step of calculating a correction value of the rotational phase of the gear to be ground from the data related to the shape of the gear for use and the detected rotation number of the grinding tool, and the following based on the correction value of the rotational phase: And a fourth step of correcting the rotation phase of the gear to be ground which is machined to.

Further, a second aspect of the present invention is a phase correcting device for a gear grinding machine, which corrects the rotational phase of a grinding tool controlled in synchronous rotation and a gear to be ground by a correction value of an input grinding amount. Input means for inputting a correction value of a grinding amount of the gear to be ground, and gear shape storage means to be ground for storing data relating to a preset shape of the gear to be ground,
A rotation speed detection unit that detects the rotation speed of the grinding tool, a correction value of the grinding amount, data relating to the shape of the gear to be ground, and a rotation speed of the grinding tool that is detected, and a gear to be ground. A phase correction value calculating means for calculating a correction value of the rotation phase of the gear, and a phase correction means for correcting the rotation phase of the gear to be ground based on the correction value of the rotation phase of the gear to be ground. Characterize.

[0010]

In the method and apparatus for correcting the phase of the gear grinding machine according to the present invention, the correction value of the grinding amount inputted from the input means on the basis of the grinding result and the grinding amount stored in the gear shape memory means for grinding are to be ground. The phase correction value calculation means calculates the correction value of the rotation phase of the gear to be ground from the data on the shape of the gear and the detected rotation speed of the grinding tool. Then, based on the correction value of the rotation phase, the phase correction means corrects the rotation phase of the gear to be ground next to be ground.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a phase correcting method for a gear grinding machine according to the present invention will be described in detail below with reference to the accompanying drawings, with reference to preferred embodiments in relation to an apparatus for carrying out the method.

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

Further, on the traverse table 18, a work sensor 24 comprising a proximity switch for generating a predetermined pulse by detecting the number of teeth of the grinding gear 22 such as a gear and the rotating grinding gear 22. Is provided.
The workpiece gear 22 rotates under the action of the work spindle motor 26.

On the other hand, a column 28 is arranged on the bed 12 in the traveling direction of the cutting table 14, and a swivel table 30 is held by 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. Further, the turning table 30 is provided with a shift table 32. The shift table 32 is operated by a shift motor 34. To the arrow D direction.

A shift shaft encoder 35 is attached to the shift motor 34, and the shift shaft encoder 35 detects the rotation speed of the shift motor 34.

As shown in FIG. 2, the grindstone spindle unit 36 basically comprises a grindstone spindle motor 38 and a master shaft encoder 46 which engages with a master shaft 39 which is a tool shaft rotated by the grindstone spindle motor 38. To be done. The grindstone 42 that rotates under the action of the grindstone spindle motor 38 has a cylindrical shape, and a spiral groove is formed on the periphery thereof.

Since the grindstone spindle unit 36 is attached to the shift table 32, the shift motor 3
It 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.
The rotary shaft 48 is detachably supported on one end of the rotary shaft 48 via a pair of clamp jigs 50, and on the other end side of the rotary shaft 48 is a relatively large-diameter gear 54 via an electromagnetic clutch 52. Is pivotally supported. The gear 54 has a smaller diameter than that of the gear 56.
The gear 56 is pivotally supported on the shaft 58. This axis 58
A gear 57 is rotatably supported on the gear shaft 57. The gear 57 meshes with a gear 59 having a smaller diameter than that of the gear 57. The gear 59 is rotatably supported on the slave shaft 61. One end of the slave shaft 61 is connected to the work spindle motor 26 via a coupling 60, and a slave shaft encoder 62 is attached to the work spindle motor 26. An inertia damper 63 is connected to the other end of the slave shaft 61.

Next, a synchronous control circuit 64 provided in the gear grinding machine 10 for synchronizing the phases of the grindstone 42 and the gear 22 to be ground will be described with reference to FIG.

The rotation speed N _M of the master shaft 39 rotating under the action of the grindstone spindle motor 38 is determined by the master shaft encoder 4
Detected by 6. The output signal PG ₁ of the master axis encoder 46 is the feedforward control unit 65.
Is input to the four-times multiplication counter 66 and is multiplied by four, and then is input to the feedforward calculator 68 via the addition / subtraction circuit 67.

The calculation result of the feedforward calculator 68 is introduced into the first input terminal of the adder 72 as the feedforward command signal S _ff via the D / A converter 70.

On the other hand, the master axis speed data S _M which is another calculation result of the feedforward calculator 68 is introduced to the semi-closed loop calculator 76 which constitutes the semi-closed loop control unit 74. In this case, the other input terminal of the semi-closed loop computing unit 76 is connected to the slave shaft encoder 62 which is attached to the work spindle motor 26.
The feedback signal PG ₂ output from is supplied via the quadruple multiplication counter 78.

This feedback signal PG₂Based on semi
The closed loop computing unit 76 uses the D / A converter 80.
Via a semi-closed loop command signal S_f2Adder 72
To the second input terminal of. With the output signal of the adder 72
Slave axis speed data S _SIs the motor drive circuit 81
Work spindle motor 2 for driving the gear to be ground via
Control the number of rotations of 6.

A traverse shaft encoder 82 is attached to the traverse motor 20, and an output signal PG ₃ of the traverse shaft encoder 82 is transmitted through a quadruple multiplication counter 84 in the semi-closed loop control unit 74 to a semi-closed loop computing unit. It is introduced in 76.

Accordingly, the traverse movement amount of the traverse table 18 due to the rotation of the traverse motor 20 is subjected to a predetermined differential calculation as will be described later by the semi-closed loop calculator 76, and the calculation result is the D / A converter 80.
_Is introduced into the adder 72 so as to be added to the semi-closed loop command signal S _f2 via.

On the other hand, the phase correction value calculating circuit 88 calculates the phase correction value P _F based on the correction value S of the grinding amount input from the keyboard 86, and the calculated correction value P _F is the correction value output circuit. It is output to the addition / subtraction circuit 67 via 90.

The feed-forward control unit 65, the clock input terminal CK of the semi-closed loop control unit 74, and the correction value output circuit 90 have a sampling clock T _S obtained by dividing the oscillation frequency of a crystal oscillator (not shown). Will be introduced.

The operation of grinding the gear 22 to be ground by the grindstone 42 by the gear grinding machine 10 configured as described above will be described with reference to the flowchart of the main processing shown in FIG.

First, the phases of the grinding wheel 22 and the grindstone 42 are matched (step S1), the rotations of the grinding wheel 42 and the grinding wheel 22 are synchronously controlled (step S2), and the grindstone 42 is rotated.
Then, the gear 22 to be ground is ground (step S3).

The operator confirms the result of grinding by measuring the lead of the ground gear 22 to be ground (step S4), and inputs the correction value S of the grinding amount from the keyboard 86 if necessary (step S4). Step S5).

Then, as in step S1, the phase of the next grinding wheel 22 mounted on the gear grinding machine 10 and the grindstone 42 are matched (step S6), and the grinding wheel 22 and grindstone 42 are aligned. Synchronously control the rotation of (step S
7). The rotation data of the grindstone 42 in this synchronous control,
A correction value P _F of the phase of the slave shaft 61 is calculated based on the correction value S of the grinding amount input in step S5 and the shape data of the gear to be ground 22 stored in advance in the storage means (step S5). S8).

The rotation phase of the work spindle motor 26 is corrected based on the calculated correction value P _F (step S9), and the gear 22 to be ground which rotates by this corrected phase is ground by the grindstone 42 ( Step S
10).

Then, the steps S7 to S1
The operation and effect of the synchronous rotation control in 0 will be described with reference to FIGS.

Table 1 shows the specifications of the gear to be ground 22 according to this embodiment, the resolution of the encoder arranged in the gear grinding machine 10, and the like. These data are stored in a storage means (not shown) and read by the feedforward calculator 68 and the semi-closed loop calculator 76.

[0035]

[Table 1]

Master axis encoder 46 in Table 1 above
Resolution R _M is a value after being multiplied by 4 by the quadruple multiplication counter 66, and R _M = 72000 p / r (pulses / revolu
tion).

First, the feedforward control unit 6
The calculation contents of 5 will be described.

When the grindstone spindle motor 38 is energized and the grindstone 42 is rotated at a rotation speed N _M = 3000 rpm, an output signal PG ₁ is output from the master shaft encoder 46, and the output signal PG ₁ is supplied to the feedforward control unit 6.
It is introduced into the feedforward computing unit 68 via the quadruple multiplication counter 66 constituting the number 5.

The pulse train generated from the master shaft encoder 46 at every sampling time t _S = 300 μs when the grindstone 42 rotates at 3000 rpm, that is, the master shaft speed data S _M is 1080 p / s as shown in the following equation (1). sa
It becomes mple.

S _M = (N _M / 60) × R _M × t _S (p / sample) (1) = (3000/60) × 72000 × 300 × 10 ⁻⁶ = 1080 (p / sample) On the other hand, As shown in Table 1, the number of teeth Z of the gear 22 to be ground is 6
Since it is 0, the rotation speed N _W of the gear 22 to be ground with respect to the grindstone 42 rotating at 3000 rpm is derived by the following equation (2), and its value is 50 rpm. In the expression (2), the reference symbol P is the number of threads of the tool, and in this case, it is “1” corresponding to the number of threads of the grindstone 42.

N _W = (P / Z) × N _M (rpm) (2) = (1/60) × 3000 = 50 (rpm) Next, the work spindle motor 26 and the grinding target gear 22.
Considering that the speed reduction ratio Q of the gear train, which is the rotation transmission means interposed between and, is 24: 1 (Q = 24), the rotation speed N _S of the work spindle motor 26 is ), It may be rotated at 1200 rpm.

N_S= N_W× Q (rpm) (3) = 50 × 24 = 1200 (rpm) Therefore, the voltage to be applied to the work spindle motor 26.
Values are work spindle motor 26 and motor drive circuit
From the rated specification value of 81, for example, the rated speed N _SRIs 30
00 rpm and the rating of the work spindle motor 26
Input voltage V_RIf is 6V, rotation per 1V
It is understood that the number is 500 rpm / V, and eventually 12
Work spindle motor to rotate at 00 rpm
It is sufficient to supply 2.4V to 26. This relationship
Is shown in equation (4).

N _SR / V _R = (Rated speed) / (Rated input voltage) (rpm / V) (4) = 3000/6 = 500 (rpm / V) In this case, the bit of the D / A converter 70 If the number is 12 bits and the output voltage corresponding to 12 bits is ± 10V, in order to obtain the analog voltage 2.4V for rotating the work spindle motor 26 at 1200 rpm,
As shown in the equation (5), the digital value V _{(D / A24)} = 2539 may be supplied to the D / A converter 70.

V _{(D / A24)} = {(2 ¹² × 2.4) / 20} +2 ¹¹ = 2539 (5) In this embodiment, the motor drive circuit 81 operates as a voltage follower.

Thus, as long as the grindstone 42 rotates at 3000 rpm, the gear 22 to be ground rotates synchronously at 50 rpm.

However, disturbance is mixed in these control systems. A position loop control system is required to correct this disturbance. Therefore, next, the semi-closed loop control unit 74 constituting the position loop control system will be described.

In order to carry out highly accurate synchronous rotation control, it is necessary to carry out accurate position control. This synchronous calculation is performed by the output signal PG relating to the position generated from the master axis encoder 46.
₁ is converted into master axis speed data S _M by the feedforward control unit 65, and then the slave axis encoder 6
The feedback signal PG ₂ relating to the position generated from ₂ is converted into slave axis speed data S _S by the semi-closed loop control unit 74.

Next, the master axis speed data S_MAnd
Resolution R of the rave axis encoder 62 _SMultiplied value with and (S_M
× R_S) And the slave axis of the slave axis encoder 62
Speed data S_S, Resolution of master axis encoder 46
R_M, The number of teeth Z of the gear 22 to be ground, and the gear train
Multiplication value (S_S× R_M× Z × (1 /
Q)) may be controlled to have the same value.

In this case, the position error E _P due to disturbance or the like is calculated as shown in the equation (6), and the master axis speed data S
The multiplication value (S _M × (R _S / R _M )) of _M and the slave axis encoder resolution ratio R ₀ = R _S / R _M , the slave axis speed data S _S, and the master axis encoder resolution ratio (R _M /
R _M ) = 1, the number of teeth Z of the gear 22 to be ground, and the reduction ratio (1 / Q) of the gear train (S _S × R _M × Z ×)
If (1 / Q)) is equal, it is determined that the master shaft 39 and the rotary shaft 48 are completely synchronized.

On the other hand, when there is a difference in the multiplied values, the position error E _P , which is the difference, is _added to the position loop gain K.
_Since a value multiplied by _P (not shown) is output to the D / A converter 80, the work spindle motor 26 rotates so as to correct the position error E _P. E _P = (master shaft speed data × slave axis encoder resolution ratio) - (number of teeth × 1 / gear train reduction ratio of the slave axis velocity data × master axis encoder resolution ratio × the grinding wheel) ... (6) = {S _M × (R _S / R _M )}-{S _S × (R _M / R _M ) × Z × (1 / Q)} = (1080 × 1)-{432 × 1 × 60 × (1/24) } = 0 Here, the slave axis velocity data S _S is given by the following equation (7). S _S = (N _S / 60) × R _S × t _S (p / sample) (7) = (1200/60) × 72000 × 300 × 10 ⁻⁶ = 432 (p / sample) Expression (6) The result of the calculation by means that the master shaft 39 and the slave shaft 61 are rotating in perfect synchronization.

Next, the mutual relationship between the feedforward control unit 65 and the semi-closed loop control unit 74 in the synchronous control circuit 64 which operates as described above will be described in more detail with reference to the flowcharts of FIGS. . In the flowchart, the alphabet a, which is the reference numeral after step S, corresponds to the control by the feedforward control unit 65, and the alphabet b corresponds to the control by the semi-closed loop control unit 74.

Each of the initial data shown in Table 1 is read by the feedforward calculator 68 and the semi-closed loop calculator 76, and a predetermined calculation is performed (steps S11a and S11b). The predetermined calculation is a calculation for obtaining items that can be calculated in advance, for example, the number of revolutions of the work spindle motor 26 per 1 V and the resolution ratio R _O of the slave axis encoder.

Next, the output signal PG ₁ relating to the position output from the master axis encoder 46 is introduced to the quadruple multiplication counter 66 in the feedforward control unit 65 (steps S12a and S13a), and this quadruple multiplication counter 66 is supplied. The output signal P _H multiplied by 4 is output to the adder / subtractor circuit 67.

On the other hand, the phase correction value calculation circuit 88 calculates the phase correction value P _F based on the correction value S of the grinding amount input by the operator from the keyboard 86, and when the calculation result is not "0", The correction value P _F is output to the correction value output circuit 90. The correction value output circuit 90 outputs the correction value P _F to the adder / subtractor circuit 67 pulse by pulse in synchronization with the sampling clock T _S.

The adder / subtractor circuit 67 includes the quadruple counter 6
The phase correction value P _F is added and subtracted from the output signal P _{H of} 6 and the calculation result is output to the feedforward calculator 68 (step S14a).

In this case, the adder / subtractor circuit 67 uses the modified value P
_The operation process branches depending on the value of _F. That is, when the correction value P _F is P _F > 0, the output signal P _H of the quadruple multiplication counter 66 and the correction value P _F are added, and the addition result is output to the feedforward calculator 68. Further, when the value of the correction value P _F is P _F <0, the correction value P _F is subtracted from the output signal P _H of the quadruple counter 66,
The result of this subtraction is output to the feedforward calculator 68. When the modification value P _F is P _F > 0, the modified phase is advanced, and when P _F <0, the modified phase is delayed.

The output of the addition / subtraction circuit 67 is time-differentiated by the feedforward calculator 68 to calculate the master shaft speed data S _M corresponding to the rotation of the grindstone 42 (see the equation (1)) (step S15a), and It is transferred as parallel data to the closed loop computing unit 76 (step S16a). Then, a synchronous operation is performed to calculate slave axis synchronous speed data S _W (step S
17a).

The slave shaft synchronous speed data S _W is multiplied by the feed forward loop gain K _f to obtain the feed forward command signal S _ff for rotating the work spindle motor 26 at the rotation speed N _S = 1200, and D Is introduced into the A / A converter 70 (step S1)
8a, step S19a). The feedforward command signal S _ff that is the output signal of the D / A converter 70 is introduced into the first input terminal of the adder 72 (step S2).
9).

On the other hand, the feedback signal PG ₂ output from the slave shaft encoder 62 axially attached to the slave shaft 61 is the 4th signal of the semi-closed loop control unit 74.
The signal is multiplied by 4 by the multiplication counter 78 (steps S12b and S13b), and the signal multiplied by 4 is differentiated and converted into slave axis velocity data S _S corresponding to the semi-closed loop system, as in the equation (7). (Step S14b).

Further, an output signal PG indicating the position is output from the traverse shaft encoder 82 mounted on the traverse shaft 83.
₃ is input through the quadruple counter 84 in semi-closed loop calculator 76 (step S15b), is differentiated by a semi-closed loop calculator 76, the speed data S _t of the traverse shaft 83 corresponding to the semi-closed loop is determined Then, the differential calculation is performed (step S16b).

Next, the master axis speed data S _M is input from the feedforward calculator 68 (step S18).
b), Position error E corresponding to semi-closed loop system
_P is calculated (steps S19b to S21)
b). That is, the master axis speed data S _M is integrated,
This integrated value and the integrated value of the speed data S _t of the traverse shaft 83 are added, and the integrated value of the slave shaft speed data S _S is subtracted from the added value.

The calculated position error E _P is time-differentiated to calculate the velocity error E _V (step S22).
b), the position error E _P is integrated, and the integrated position error E
_P1 is calculated (step S23b). Next, the position error E calculated in steps S20a and S22b
_P is multiplied by the position loop gain K _P (step S2
4b).

Then, the speed calculated in step S22b is calculated.
Degree error E_VTo speed gain K_VIs multiplied by (step S
25b), the integrated position error calculated in step S23b.
-E _P1Integral gain K_iIs multiplied by (step S26
b). As described above, steps S24b to S2.
The calculation result calculated in 6b is added for each term (step
S27b), the output signal of the D / A converter 80
Via a semi-closed loop command signal S_f2As adder
It is introduced into the second terminal of 72 (step S28b).

The semi-closed loop command signal S_f2Is
The feedforward command signal S _ffAnd adder 72
And the added data is calculated via the motor drive circuit 81.
Introduced into the work spindle motor 26, work spin
The dollar motor 26 rotates the slave shaft 61 (step
(Step S29 to step S31).

As described above, the feedforward control unit 65 and the semi-closed loop control unit 74 are organically coupled to each other to perform the synchronous operation. At this time, the phase correction value operation circuit 88 causes the keyboard 86 to operate. The correction value P _{F of the} phase is calculated on the basis of the correction value S of the grinding amount input from, and when the correction value P _F is not “0”, the correction value P _F is output to the correction value output circuit 90.

The correction value output circuit 90 outputs the correction value P _F to the adder / subtractor circuit 67 pulse by pulse in synchronization with the sampling clock T _S , and the adder / subtractor circuit 67 outputs the 1 pulse and the quadruple counter 66. The signal P _H is calculated and the calculation result is input to the feedforward calculator 68.

Phase correction value calculation circuit 88 in this operation
The action of will be described in detail below.

The phase correction value calculation circuit 88 is a module M of the gear 22 to be ground read from a storage means (not shown).
_{From n} , the displacement amount W of the gear 22 to be ground when the master shaft 39 makes one rotation is obtained by the following formula.

W = M _n × π (mm) (8) Displacement amount W of the gear 22 to be ground when the master shaft 39 makes one rotation, which is obtained by the equation (8), and output of the quadruple multiplication counter 66. From the signal P _H , the phase correction value calculation circuit 88
The displacement amount W ₁ of the gear 22 to be ground rotated by one pulse of the output signal P _H of the quadruple multiplication counter 66 is calculated by the following formula.

W ₁ = W / P _H = (M _n × π) / P _H (mm / p) (9) Here, the displacement amount W ₁ and the gear to be ground 22 input from the keyboard 86. The correction amount P _F of the phase converted into the resolution R _M of the master axis encoder 46 is obtained from the correction value S of the grinding amount of the above by the following formula.

P _F = S / W ₁ = S / (W / P _H ) = (S × P _H ) / (M _n × π) (p) (10) Therefore, as a result of the lead measurement in step S 5, When it is determined that the grinding amount needs to be corrected by 20 μm on the tooth surface of the gear to be ground 22, the correction value S of this grinding amount is S = 20 μm.
m, the module M _{n of the} gear to be ground 22 read from a storage circuit (not shown) M _n = 2.75, and the output signal P _H = 72000 (p) of the quadruple counter 66, the resolution R _{M of the} master axis encoder 46. The correction value P _F of the phase converted to is calculated by the equation (10).

P _F = 20 × 10 ⁻³ × 72000 / (2.75 × π) ≈167 (p) As a result, in order to correct the grinding amount by 20 μm, the counted output of the master axis encoder 46 is 167 The pulse should be corrected.

At this time, if the calculated correction value P _{F of the} phase is P _F > 0, the correction value P _F is added to the pulse number of the master axis encoder 46 multiplied by 4 to calculate the calculated phase. If the correction value P _F is P _F <0, it is subtracted to correct the phase of the master axis and the slave axis.

As described above, according to this embodiment,
Based on the correction value S of the grinding amount input from the keyboard 86, the correction value P _F of the phase converted into the number of pulses of the resolution R _M of the master axis encoder 46 is obtained, and this correction value P _F
By correcting the number of pulses of the master axis encoder 46 multiplied by 4 by
Correct the phase of.

In this embodiment, step S4
In the lead shaft after grinding, the slave shaft 6 is measured from the correction value S of the grinding amount input based on the measurement result.
Although the correction value P _F of the phase of 1 was calculated, a chart or the like showing in advance the relationship between the pattern of the black scale remaining on the surface portion of the gear to be ground 22 and the grinding amount due to insufficient grinding was prepared in advance, It is also possible to quickly determine the correction value P _{F of the} phase based on the chart or the like.

[0076]

In the method and apparatus for correcting the phase of the gear grinding machine according to the present invention, the phase between the grinding tool to be rotated synchronously and the gear to be ground can be easily corrected. Even when the rotation and the rotation are different due to a friction error or the like, the phase is easily corrected, and the gear to be ground next is rotated by the corrected phase,
It can be ground.

Further, by correcting the phase, it is possible to improve the grinding accuracy of the gear to be ground, the product yield is improved, and it is possible to supply a high-quality and inexpensive product. By rapidly correcting the rotational phase of the gear to be ground, the cycle time for processing the gear to be ground can be shortened and the productivity can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing an external configuration of a gear grinding machine embodying the present invention.

FIG. 2 is an explanatory diagram showing a correlation between a grindstone and a gear to be ground in the embodiment shown in FIG.

FIG. 3 is an explanatory diagram showing the correlation between the gear to be ground, the pulse generator, and the work spindle motor that drives them in the embodiment shown in FIG.

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

5 is a main flow chart showing a grinding operation of the embodiment shown in FIG. 1. FIG.

6 is a flowchart showing an operation of performing synchronous operation control in the synchronous control circuit shown in FIG.

FIG. 7 is a flowchart showing an operation of performing synchronous operation control in the synchronous control circuit shown in FIG.

8 is a flowchart showing an operation of performing synchronous operation control in the synchronous control circuit shown in FIG.

[Explanation of symbols]

 10 ... Gear grinding machine 14 ... Cutting table 16 ... Cutting motor 18 ... Traverse table 20 ... Traverse motor 22 ... Grinding gear 24 ... Work sensor 26 ... Work spindle motor 32 ... Shift table 34 ... Shift motor 35 ... Shift shaft Encoder 38 ... Grindstone spindle motor 42 ... Grindstone 46 ... Master axis encoder 61 ... Slave axis 62 ... Slave axis encoder 64 ... Synchronous control circuit 65 ... Feed forward control unit 66, 78, 84 ... Quadrupling counter 67 ... Addition / subtraction circuit 68 ... Feed Forward calculator 72 ... Adder 74 ... Semi-closed loop control unit 76 ... Semi-closed loop calculator 81 ... Motor drive circuit 86 ... Keyboard 88 ... Phase correction value calculation circuit 90 ... Correction value output circuit

Claims (2)

[Claims] 1. A phase correction method for a gear grinding machine, which corrects a rotational phase between a grinding tool controlled in synchronous rotation and a gear to be ground by a correction value of an input grinding amount, wherein the input grinding is performed. A first step of reading a correction value of the amount, a second step of reading data related to a preset shape of the gear to be ground, a correction value of the grinding amount, and a shape of the gear to be ground. A third step of calculating a correction value of the rotation phase of the gear to be ground from the data and the detected rotation number of the grinding tool, and a workpiece to be machined next based on the correction value of the rotation phase. A fourth step of correcting the rotational phase of the grinding gear, and a phase correcting method of the gear grinding machine, which comprises: 2. A phase correction device for a gear grinding machine, which corrects the rotational phase of a grinding tool and a gear to be ground, which are controlled to rotate synchronously, by a correction value of an input grinding amount. Input means for inputting a correction value of the grinding amount, gear shape storage means for grinding to store data relating to a preset shape of the gear to be ground, and rotation speed detection for detecting the rotation speed of the grinding tool Means, a correction value of the grinding amount, data related to the shape of the gear to be ground, and a phase correction value for calculating a correction value of the rotation phase of the gear to be ground from the rotation speed of the detected grinding tool A phase correction device for a gear grinding machine, comprising: a calculation unit; and a phase correction unit that corrects a rotation phase of the gear to be ground based on a correction value of a rotation phase of the gear to be ground.