JPS5835388Y2 - Tooth thickness adjustment device for gear cutting machines - Google Patents

Description

[Detailed description of the invention] This invention indirectly measures the tooth thickness when machining gears using a gear cutting machine, and based on that, corrects the distance between the axes of the gear cutting tool and the gear to be machined. The present invention relates to a tooth thickness adjusting device for a gear cutting machine that is capable of machining gears with thick teeth.

As is well known, hobbing machines and gear shapers are used to process gears.
Gear cutting machines such as the following are used, but they have the following disadvantages.

(1) Each time a gear cutting tool is reground, the tooth thickness of the tool decreases, so trial machining must be performed each time the tool is replaced to provide a depth of cut commensurate with the decrease in the tooth thickness of the tool, which is very time-consuming. It takes.

(2) The operator measures the tooth thickness of the cut gear using an overball diameter measurement method, a matagi tooth thickness measurement method, or the like and presses the button, which requires skill.

(3) The depth of cut of the gear cutter into the gear to be machined is calculated based on the measured value, and the lateral feed is applied based on the calculated value, which relies on the experience and intuition of the operator.

(4) In normal gear processing, 20 to 2
Every time about 5 pieces are machined, the troublesome tooth thickness measurement and check described above must be carried out.

(5) If the tooth thickness of the gear after gear cutting is not appropriate,
In addition to poor meshing with the mating gear, if shaving is performed in the subsequent process, not only will the precision after shaving not be achieved, but in the worst case, the expensive shaving cutter may be damaged or the tooth surface of the gear may be damaged. In some cases, rough edges may remain due to tooth cutting.

The purpose of the present invention is to eliminate the various drawbacks of the prior art as described above, to shorten the setup time when replacing a gear cutting tool, to save the effort of adjusting the depth of cut of the tool, and to make the feed adjustment easier. Regardless of the dimensions of the cutting tool, even inexperienced workers can easily perform the work, stably improve the quality of the product, and if there is a post-process (mainly a shaving process), the product can be obtained in the post-process. An object of the present invention is to provide a tooth thickness adjusting device for a gear cutting machine, which can also improve gear accuracy.

Embodiments of the present invention will be described below with reference to the drawings.

A table Y is disposed with respect to the gear cutting machine main body X so as to be movable in the left and right directions as shown in the figure by means of a feed screw 14, which will be described later.

The table Y is provided with a gear cutting jig 1T for correctly supporting and rotating the work gear 1a or, alternatively, the master gear 1b.

A saddle xb is provided on a column Xa that is integrally fixed to the gear cutting machine main body X so as to be slidable in the vertical direction and has a button, and a gear cutting tool, in this example, a hob 2, can be rotated on the saddle xb. Installed.

As is well known, the gear cutting tool 2 is configured to be rotated and at the same time fed in the vertical direction by the movement of a saddle, so that the rotating workpiece gear 1a can be machined.

The gear cutting machine main body are screwed together.

Therefore, by operating the motor 15, the table Y
can be moved to the left or right in the diagram.

Note that the feed screw 14 may be rotated by a manual handle instead of the motor 15.

Further, a pulse motor 11 is fixed to a part of the gear cutting machine main body 12 is screwed into a female screw 13 provided in a part of the gear cutting machine body X.

Therefore, by rotating the pulse motor 11 forward and backward, the male screw 12 itself moves to the right or left in the figure with respect to the gear cutting machine body X.

As will be described later, the end surface 12a of the male screw 12 functions to determine the position of the table Y in the feeding direction in cooperation with a limit switch 16 attached to the bracket 20.

The chiffle Y is provided with a device Z that rotatably supports the measuring gear 3 and can mesh it with the workpiece gear 1a or the master gear 1b as required.

For example, the lever 4 is rotatably supported at approximately the middle by a support base 5, so that the lever can be swung on a chiffle element, and the measuring gear 3 can be rotatably mounted at one end of the lever 4. Attach.

The other end of the lever 4 is formed with a protrusion 4a that can come into contact with a detector 9, which is a transducer such as a potentiometer.

In addition, a compression spring 6 is provided in the middle of the lever 4 between the lever 4 and a biasing means such as a spring (7a), 7a attached to the tip of the piston rod 7, so that the lever 4 is always moved clockwise as shown in FIG. As shown by the solid line in the same figure,
While pressing the measuring gear 3 to the workpiece gear 1a or the master gear 1b to engage them, the piston rod 7 is pressed as necessary.
Move relative to cylinder case 8 (left row in Figure 2)
By rotating the lever 4 counterclockwise, the measuring gear 3 is moved to the workpiece gear 1 as shown by the dashed line in FIG.
a or the master gear 1b.

When fluid pressure (air pressure or hydraulic pressure) is applied from hole A, piston rod I moves to the left in the figure and moves to hole B.
When fluid pressure is applied from , it moves to the right.

As shown in the figure, when the measurement gear 3 is pressed against the workpiece gear 1a or the master gear 1b by the biasing force of the spring 6 and meshes with each other with zero backlash, the detector 9 detects the workpiece gear 1a or the master gear 1b. A change in the relative position of the measuring gear 3 and the distance D1 between their center axes is detected as an enlarged displacement amount of the protruding portion 4a at the end of the lever 4, and it is converted into an electrical quantity and the electrical signal is generated. The data is sent to a control device 10 as shown in FIG.

Next, the operation will be explained mainly with reference to FIGS. 1 and 2.

First, before gear cutting, operate the motor 15, move the table Y to the right in the figure using, for example, a limit switch (not shown), and then insert the master gear 1b into the gear cutting jig 1γ.
The measuring gear 3 is pressed against the master gear 1b with zero backlash by applying fluid pressure from the hole B of the cylinder case 8, and the protrusion 4a is detected by the detector 9 at this time. The control device 10 reads the position of , and stores it as a reference value.

Next, by applying fluid pressure through the hole A of the cylinder case 8, the measuring gear 3 is separated from the master gear 1b, and the master gear 1 is separated from the master gear 1b.
b is removed from the gear cutting jig 17, and the to-be-processed gear 1a is installed in its place.

Next, the saddle xb is lowered to a predetermined position so that the hob 2 can cut the gear to be processed 1a.

As in the topo embodiment, the saddle xb is lowered in the case of a climb cut, but the saddle is raised to a predetermined position in the case of a down cut.

Next, the motor 15 is rotated so that the distance D2 between the axes (slightly larger than the normal distance is better) between the hob 2 and the gear to be processed is approximately obtained, and the table Y is rotated using, for example, a limit switch (not shown). After moving to the left in the figure and stopping at a predetermined position, the pulse motor 11 is operated to bring the tip end surface 12a of the female thread 12 into contact with the actuator of the limit switch 16.

In this case, it is safe to initially set the center distance D2 to be a little larger.

This is because if the tooth thickness falls below the lower limit due to excessive depth of cut, correction cannot be made.

When replacing the new button or hob 2, the work of replacing the old and new hob is added to the above-mentioned procedure, but in that case, measure the difference in the outer radius of the hob and measure that difference, for example (not shown). The distance D2 between the axes may be changed by moving the limit switch dog.

After gear cutting of the gear to be machined 1a is prepared in this manner, the gear cutting machine is operated to start gear cutting.

The automatic feeding of the saddle xb in the gear cutting machine, the rotational speed of the hob, and the setting of the rotational speed of the gear to be machined to be interlocked with the hob are carried out by well-known methods, and therefore their explanation will be omitted.

After the start of cutting, when teeth have been formed to some extent on the material of the gear to be machined 1a, that is, when the teeth have been cut to the extent that they can completely mesh with the measuring gear 3, fluid pressure is applied from the hole B of the cylinder case 8. Then, the piston rod 7 is moved to the right end position, the lever 4 is rotated clockwise, and the measuring gear 3 is pressed by the force of the spring 6 against the completely geared part of the material of the gear to be processed 1a.

Thereby, the measuring gear 3 rotates in mesh with a narrow tooth section formed in the material of the workpiece gear 1a.

At that time, the control device 10 reads the position of the protrusion 4a detected by the detector 9, and calculates the difference from the reference value when the master gear is installed. A pulse signal corresponding to the amount of additional cutting can be transmitted to the pulse motor 11.

Here, the operation of the control device 10 will be explained with reference to FIG.

When first measuring the master gear 1b, the amount of electricity detected by the detector 9 passes through the electric wire 9a to the A-D conversion circuit 3.
1, the circuit 31 generates a pulse corresponding to the amount of electricity, and the differential circuit 35 generates a pulse once.

Since the counter 36 counts the first operation in the differentiator circuit and operates the first memory circuit 32, the output from the A-D converter circuit 31 is input to and stored in the first memory circuit 32, and its output is continues to be input to the arithmetic circuit 34.

Next, remove the master gear 1b and replace it with the workpiece gear 1a.
After the gear is attached and a part of the gear is completely cut as described above, the measuring gear 3 is again pressed against the gear to be machined 1a and the measurement is carried out.

At this time as well, the quantity of electricity detected by the detector 9 is input to the A-D conversion circuit 31 through the electric wire 9a, and is also input to the differentiation circuit 35.

However, in this case, the counter 36 counts the second operation in the differentiating circuit 35 and activates the second memory circuit 33, so the output from the AD conversion circuit 31 is manually input and stored in the second memory circuit 33. At the same time, its output is input to the arithmetic circuit 34.

That is, signals from both the first memory circuit 32 and the second memory circuit 33 are input to the arithmetic circuit 34, the difference between the two is computed, and the output thereof is input to the discrimination circuit 37.

On the other hand, the output of the upper limit value and lower limit value setting circuit 38, that is, the upper limit value and lower limit value obtained by adding or subtracting a certain width to the value stored in the first storage circuit 32 are input to the discrimination circuit 31. When the difference calculated by the calculation circuit 34 is between the upper limit value and the lower limit value (tolerable range), the output is not output, and gear cutting is continued, but when the difference exceeds the upper limit value, the output is not output. sends a signal to the display circuit 39 to display "insufficient depth of cut," and at the same time outputs a gear cutter operation stop signal via the electric wire 40 to stop the gear cutter operation, and based on the calculation result. The pulse signal is sent to the pulse motor 11 via the electric wire 10a.
It depends on the situation.

Due to the rotation of the pulse motor 11, the tip end surface 12a of the male screw 12 for fine adjustment is moved to the left in the figure by a predetermined amount (corresponding to the amount of additional cutting) from the position shown in FIG.

Next, the operator lowers the saddle xb to the position before starting cutting to eliminate interference between the gear cutting tool 2 and the gear to be machined 1a, and operates the motor 15 to move the table Y to the left in the figure.

Then, the actuator of the limit switch 16 collides with the tip surface 12a, thereby stopping the movement of the table Y.

Since the additional depth of cut of the gear cutting tool 2 into the gear 1a to be machined is thus obtained, the operation of the gear cutting machine is started again.

Note that R in FIG. 3 indicates a reset circuit.

In addition, before restarting operation, apply fluid pressure from the hole A of the cylinder case 8 to rotate the lever 4 in the counterclockwise direction as described above to separate the measuring gear 3 from the gear to be processed 1a. is good.

In the above embodiment, the gear cutting machine is explained in which the table Y is moved relative to the gear cutting tool 2, but the work table Y is fixed to the gear cutting machine body and the gear cutting tool 2 is moved relative to the work table Y. It goes without saying that the present invention can also be applied to a moving type gear cutting machine.

Moreover, it goes without saying that after the machining is completed, the tooth thickness can be checked again by the procedure described above.

Since the present invention has the above-mentioned configuration, the following effects can be achieved in particular.

(1) Preparation for trial machining and feed adjustment associated with gear cutting tool replacement is simplified, and the time required can be shortened.

(2) Even an inexperienced worker can easily perform setup work for replacing gear cutting tools without relying on experience or intuition.

(3) Tooth thickness measurement and necessary cutting depth can be automatically performed.

(→ Can measure tooth thickness of gold products.

(5) Product quality can be stably improved.

(6) If a post-process (mainly a shaving process) is required, the accuracy of the subsequent process can be improved.

Also, there will be no rough edges left during the gear cutting process.

[Brief explanation of drawings]

1 and 2 are schematic diagrams showing an example of a gear cutting machine equipped with a tooth thickness adjusting device according to the present invention, with FIG. 1 being a side view and FIG. 2 being a plan view. FIG. 3 is a block diagram of the control device. 1a...To be processed gear, 1b...Master gear, 2.
... Gear cutting tool (hob), 3 ... Measuring gear, 4 ... Lever, 5 ... Support stand, 6 ... Compression spring, 7.
...Piston Rondo, 8...Cylinder case, 9...
・Detector, 10... Control device, 11... Pulse motor, 12... Male thread for fine adjustment, 13... Female thread,
14...Feed screw, X...gear cutting machine body, Y...table, Z...device, Xa...column, xb...
saddle.

Claims (1)

[Scope of utility model registration request] A table movable relative to the gear cutting tool is disposed, and a device for supporting and rotating a master gear or a to-be-worked gear and a measuring gear capable of engaging and separating from the master gear or to-be-worked gear are disposed on the table. a detection device for detecting a change in the distance between the axes of the master gear or the workpiece gear and the measurement gear when the two gears are meshed; A tooth thickness adjusting device for use with a gear cutting machine, characterized in that the tooth thickness of the gear to be machined is adjusted by moving the gear relative to the tool.