JP2540612B2 - Gear matching method for gear grinding machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for aligning a grindstone with a gear in a gear grinding device that grinds a gear using a gear-shaped grindstone.

<Prior Art> In recent years, a hardened gear finisher (hard gear finisher) for efficiently finishing a gear after heat treatment has been developed. The hard gear finisher is a gear-shaped CB
Using an N (cubic boron nitride) grindstone (hereinafter simply referred to as a grindstone), this grindstone meshes with the gear to be machined with an axial crossing angle, and the grindstone and the gear to be machined are driven synchronously in the tooth trace direction. It causes slippage and presses a grindstone against the gear to be processed to finish the grinding of the gear to be processed.

A mechanism for synchronizing the grindstone and the gear to be processed will be described with reference to FIG.

The output shaft 2 of the drive motor 1 is provided with a gear-shaped grindstone 3, and the output shaft 2 is provided with a master drive gear 4 having the same number of teeth as the grindstone 3. A coupling 5 for removing backlash is provided on the output shaft 2 between the grindstone 3 and the master drive gear 4. On the other hand, the driven shaft 6 has a processed gear 7 that meshes with the grindstone 3, and a master drive gear 4
There is provided a master driven gear 8 having the same number of teeth as the gear 7 to be processed which meshes with. The output shaft 2 and the driven shaft 6 are provided with a predetermined axis crossing angle.

When the output shaft 2 is rotated by the drive of the drive motor 1, the grindstone 3 is rotated and the master drive gear 4 is rotated via the coupling 5. The work gear 7 is rotated by the rotation of the master drive gear 4, and the work gear 7 is driven via the master drive gear 4 and the master driven gear 8 in synchronization with the rotation of the grindstone 3.

However, according to the synchronizing mechanism shown in FIG. 2, since the grindstone 3 and the processed gear 7 are synchronized via the master drive gear 4 and the master driven gear 8, the grindstone 3
It is necessary to prepare the master drive gear 4 and the master driven gear 8 according to the type of the processed gear 7. In addition, the master drive gear 4 and the master driven gear 8 must be replaced every time the gear 7 to be processed is changed, resulting in a large amount of setup change. Further, since the output shaft 2 and the driven shaft 6 have an axial intersection angle, the meshing angle between the grindstone 3 and the gear 7 to be processed, the master drive gear 4 and the master driven gear 8
It was difficult to achieve accurate synchronization due to the different meshing angle with.

Therefore, as shown in FIG. 3, the grindstone 3 and the processed gear 7 are
Are driven and rotated by an independent grindstone drive motor 9 and work drive motor 10, respectively, and the grindstone drive motor 9 and the work drive motor 10 are driven by numerical control to synchronize the rotations of the grindstone 3 and the gear 7 to be processed. A hard gear finisher that has been designed is considered.

In this hard gear finisher, since it is necessary to mesh the grindstone 3 and the gear 7 to be processed in an appropriate state at the time of processing, the processing is started after the teeth are aligned. Conventionally, when the whetstone 3 and the gear 7 to be machined are brought into mesh with each other, the whetstone 3 and the gear 7 to be machined are manually engaged with each other in a stopped state to make a substantially constant size state.
The rotational position of was corrected so that it would mesh with the center, and this was memorized. After the teeth are aligned, the grindstone 3 and the gear 7 to be processed are disengaged, and the grindstone drive motor 9 and the work drive motor 10 are started to perform grinding.

<Problems to be Solved by the Invention> Tooth engagement between the conventional grindstone 3 and the gear 7 to be processed has been performed by engaging the grindstone 3 and the gear 7 to be processed at one location. However, since the grindstone 3 and the gear 7 to be machined are eccentric and the state is different depending on the teeth, proper meshing cannot be performed over the entire circumference of the grindstone 3 by conventional meshing at one location, and grinding is not possible. If you do not increase the cost, you may have left uncut.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a gear matching method for a gear grinding device that can perform proper gear matching regardless of the shapes of the grindstone and the gear to be processed.

<Means for Solving the Problem> A tooth-matching method of a gear grinding device of the present invention for achieving the above object is to rotate a grinding wheel shaft to which a gear-shaped grindstone is attached and a work shaft to which a gear to be processed is attached. The grinding wheel shaft or the work when the grinding wheel shaft is driven and rotated only in the synchronous control state when the grinding wheel and the processing gear are engaged with each other to perform grinding of the processing gear Detecting a plurality of first actual rotational position values of the shaft, between the plurality of first theoretical rotational position values and the plurality of first actual rotational position values of the grindstone shaft or the work shaft during synchronous rotation of the grindstone shaft The difference is calculated and the average value of the difference is added to the first theoretical rotation position axis to be the first actual theoretical rotation position axis, and only the work axis is driven and rotated in the synchronous control state. Multiple work axes The second actual rotational position value of the number, the difference between the plurality of second theoretical rotational position value of the grindstone shaft or the workpiece shaft and the plurality of second actual rotational position value at the time of synchronous rotation of the work shaft. Obtained and added the average value of the difference to the second theoretical rotational position value to obtain a second actual theoretical rotational position value, and an intermediate position value between the first actual theoretical rotational position value and the second actual theoretical rotational position value. It is characterized in that the grindstone axis and the work axis are synchronously controlled as a value of a meshing position between the grindstone and the gear to be processed.

<Examples> Fig. 1 shows the state of the essential parts of a gear grinding apparatus for carrying out the tooth-matching method according to one embodiment of the present invention, and Fig. 2 shows a graph for explaining the tooth-matching position determination. The same members as those shown in FIG. 4 are designated by the same reference numerals, and the duplicated description will be omitted.

The grindstone 3 is attached to the output shaft (grindstone shaft) 9a of the grindstone drive motor 9, and the output shaft (workpiece shaft) 10 of the work drive motor 10 is attached.
The gear 7 to be processed is attached to a. Wheel axis 9a and work axis 1
The wheel 3 and the work gear 7 are brought into mesh with each other by moving 0a close to each other, and the grindstone drive motor 9 and the work drive motor 10 are driven to drive and rotate the grindstone 3 and the work gear 7 to move the grindstone shaft 9a and the work shaft 10a. Grinding is performed by plunge cutting in close proximity to the fixed size. The rotational positions of the grindstone shaft 9a and the work shaft 10a are detected by the encoders 11 and 12, respectively,
The detection values of the encoders 11 and 12 are input to the CPU 13. The grindstone drive motor 9 and the work drive motor 10 are driven and rotated based on a command from the CPU 13. The encoders 11 and 12 are used when the grinding wheel 3 and the gear 7 to be processed are aligned with each other.

 Next, the tooth matching method will be described with reference to FIG.

The grindstone 3 and the gear 7 to be processed are in the stopped state and immediately before the sizing.
Are engaged (with backlash), and only the grindstone shaft 9a is driven and rotated at a low speed in a synchronous control state by driving the grindstone drive motor 9 to rotate the work gear 7 in a driven manner (brake). The encoder 12 detects the rotational position (first actual rotational position value) of the work shaft 10a a plurality of times (N times) while the gear 7 to be processed makes one revolution. The value θ _i of the difference between the theoretical rotational position (first theoretical rotational position value θ) of multiple times (N times) and the first actual rotational position value during synchronous rotation of the work shaft 10a when only the grindstone 3 is driven and rotated. Respectively (shown by O in FIG. 2), and the average value of the difference values θ _i And the average value S is added to the first theoretical rotational position value θ to obtain the first actual theoretical rotational position axis θ _S.

Next, the work shaft 10 is driven by the work drive motor 10.
Only a is driven and rotated at a low speed in a synchronous control state, and the grindstone 3 is driven to rotate (brake). While the gear 7 to be processed makes one revolution, the rotational position (second actual rotational position value) of the work shaft 10a is detected a plurality of times (M times) by the encoder 12. A value H which is the difference between the theoretical rotational position (second theoretical rotational position value H) of a plurality of times (M times) and the second actual rotational position value during synchronous rotation of the work shaft 10a when the workpiece gear 7 is driven and rotated. seeking _i respectively (second in the figure indicated by ●), the average value of the values H _i of the difference Then, the average value T is added to the second theoretical rotational position value H to obtain the second actual theoretical rotational position value H _S.

An average backlash amount R between the grindstone 3 and the gear 7 to be machined is between the first actual theoretical rotational position value θ _S and the second actual theoretical rotational position H _S, and an intermediate position of the backlash amount R. Is the median value of bite.

The CPU 13 obtains the first actual theoretical rotational position value θ _S and the second actual theoretical rotational position value H _S based on the information from the encoder 12, and the intermediate position K of the average backlash amount R is obtained based on this to determine the center of meshing. Record as a value. Based on this median value, the grindstone drive motor 9 and the work drive motor 10 are driven in phase with each other, and the grindstone 3 and the gear 7 to be machined are meshed with each other for grinding.

Although the rotation position of the work shaft 10a is detected in the above embodiment, the intermediate position may be obtained by detecting the grindstone shaft 9a.

In the above-described tooth-matching method, since the intermediate position K of the average backlash amount R in the actual meshing state is set as the median value of meshing, even if the grindstone 3 or the gear 7 to be machined has eccentricity, all teeth are The grindstone 3 and the gear 7 to be processed can be engaged with each other in a state of being close to the center of the teeth.

<Effects of the Invention> In the tooth-matching method of the gear grinding device of the present invention, the whetstone and the gear to be processed are meshed and rotated, the intermediate position value of the average backlash amount is obtained, and this intermediate position value is used as the whetstone and the gear to be processed. Since the meshing position is set to, the grindstone and the gear to be processed can be meshed with all the teeth in a state close to the center of the tooth regardless of the state of the grindstone or the gear to be processed. As a result, the accuracy of the tooth matching is improved, and the grinding without leaving the uncut portion can be performed without increasing the grinding allowance.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of a main part of a gear grinding apparatus for carrying out a tooth aligning method according to an embodiment of the present invention, FIG. 2 is a graph for explaining tooth aligning position determination, and FIGS. It is a synchronous mechanism figure of a processed gear. In the drawings, 3 is a grindstone, 7 is a gear to be machined, 9 is a grindstone drive motor, 9a is a grindstone shaft, 10 is a work drive motor, 10a is a work shaft, 11, 12 is an encoder, and 13 is a CPU.

Claims (1)

(57) [Claims] 1. A gear to be processed by controlling the rotation of a grindstone shaft to which a gear-shaped grindstone is mounted and a work shaft to which a gear to be machined is mounted to be synchronously controlled by separate drive motors so that the grindstone and the gear to be machined mesh with each other. When performing the grinding of, the plurality of first actual rotational position values of the grindstone shaft or the work shaft when only the grindstone shaft is driven and rotated in a synchronous control state are detected, The difference between a plurality of first theoretical rotational position values of the grindstone shaft or the work shaft and the plurality of first actual rotational position values is obtained, and an average value of the differences is added to each of the first theoretical rotational position axes. As an actual theoretical rotational position value, a plurality of second actual rotational position values of the grindstone shaft or the workpiece shaft when only the workpiece shaft is driven and rotated in a synchronous control state are detected, and when the workpiece shaft is synchronously rotated. The grindstone shaft The difference between the plurality of second theoretical rotational position values of the work shaft and the plurality of second actual rotational position values is calculated, and the average value of the differences is added to each of the second theoretical rotational position values to obtain the second actual theoretical rotational position. As a position value, an intermediate position value between the first actual theoretical rotational position value and the second actual theoretical rotational position value is set as a value of a meshing position between the grindstone and the gear to be processed, and the wheel axis and the work axis are synchronized. A tooth-matching method for a gear grinding device characterized by performing control.