JPH0360919A - Toothed wheel grinder - Google Patents

Abstract

PURPOSE:To revolve a grindstone forming device surely and easily and to realize the miniaturization of the grindstone forming device and the improvement in the accuracies of turning and dressing, by providing a grindstone forming device freely revolvably around the vertical line at a table side and also providing a link device capable of linking a grindstone and the grindstone forming device. CONSTITUTION:In the case of revolving a grindstone head 33, the head 33 and a grindstone forming device 39 are linked by a link device (fixed arm) 48 and revolved just as their relation is held in the same state. The grindstone forming device 39 can thus be revolved for a table 23 at the same angle as that of a grindstone 37 surely, the grindstone forming device 39 is miniaturized and the accuracies in truing and dressing can be improved.

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to a gear grinding machine.

<Prior Art> In order to increase the durability and wear resistance of gears and make them suitable for high-speed rotation, the gears are hardened and then ground using a gear grinder.

The configuration of the gear grinding machine will be explained based on FIGS. 8 to 10. 8, 9, and 10 show the front, side, and plane views of the gear grinding machine, respectively.

A table 2 is supported on a ped 1 installed on the floor so that it can slide back and forth in one horizontal direction (left and right).
is designed to be driven back and forth via a ball screw (not shown). On the upper surface of the table 2, a headstock 3 and a tailstock 4 having a rotating main shaft are placed coaxially, and a gear 5 to be cut is supported by the headstock 3 and the tailstock 4.

A column 6 is supported on the bed 1 on the rear side of the table 2 so as to be able to reciprocate in the horizontal direction (back and forth direction) perpendicular to the direction of movement of the table 2.
9 and 10). A vertically extending sliding surface 8 is formed on the side surface of the column 6 on the table 2 side, and a slider 9 is slidably supported on the sliding surface 8, and the slider 9 is reciprocated by a grindstone vertical motor 10. . A grindstone head 11 is supported on the slider 9 so as to be rotatable about a vertical axis, and a grindstone 12 is attached to the grindstone head 11 to be driven and rotated about a horizontal axis. The grindstone 12 (grindstone shaft) is driven by a grindstone drive motor 13 (FIG. 9).

A grindstone forming device 14 is provided at the end of the table 2 so as to be rotatable around a vertical axis on the support center line of the workpiece gear 5, and a dresser for truing and dressing the grindstone 12 is provided in the grindstone forming bag [14]. ing.

The drive of the above-mentioned grindstone front and rear motor 7, grindstone up and down motor 10, grindstone drive motor 13, main shaft drive motor (not shown) and table drive motor (not shown) is controlled by a separately provided numerical control device (not shown). It looks like this.

The grinding action of the gear grinder having the above configuration will be explained.

Work gear 5 between the centers of the headstock 3 and tailstock 4
By supporting the main shaft and driving the main shaft, the gear to be cut 5 is driven and rotated through burrs and the like. The grindstone head 11 is turned in accordance with the helix angle of the gear 5 to be cut, and the grindstone 12 is driven and rotated by the drive of the grindstone drive motor 13. By the horizontal movement of the table 2, the longitudinal movement of the column 6, and the vertical movement of the slider 9, the gear to be cut 5 and the grindstone 12 are brought into contact in a predetermined state, and the gear to be cut 5 is ground. When truing and dressing the grindstone 12, the grindstone forming device 14 is rotated at the same angle as the rotation angle of the grindstone head 11, and the table 2 and the grindstone head 11 are moved in the same way as during grinding to bring the dresser into contact with the grindstone 12. let

<Problems to be Solved by the Invention> In the gear grinding machine described above, when performing truing and dressing, it is necessary to rotate the grindstone forming device 14 at the same angle as the grindstone 12. For this reason, the grindstone forming device 1
4 and a servo control device are required, and the grindstone forming device 14 has a complicated and large structure, which requires more space on the table 2 and is an expensive device.

The present invention has been made in view of the above circumstances, and provides a gear grinder equipped with a grindstone forming device that can reliably rotate at the same angle as the grindstone with an extremely simple configuration, thereby reducing the size of the grindstone forming device. The purpose is to improve the accuracy of truing and dressing.

Means for Solving the Problems> In order to achieve the above object, the present invention has a structure in which a grindstone forming device is supported on a table side so as to be rotatable around a vertical axis on a support center line of a workpiece, and a grindstone is supported. The present invention is characterized by comprising a connecting device capable of connecting the grinding wheel head and the grinding wheel forming device.

Function: When rotating the whetstone head, the whetstone head and the whetstone forming device are connected by a connecting device, and the whetstone head and the whetstone forming device are rotated while maintaining the same relationship between the whetstone head and the whetstone forming device. .

Embodiment> FIGS. 1, 2, and 3 respectively show the front, side, and plane of a gear grinding machine according to an embodiment of the present invention, and FIG. 4 shows its table rotation mechanism. be.

A bed 21 placed on the floor supports a saddle 22 as a table base that is rotatable around a vertical axis, and the saddle 22 is provided with a table 23 that is slidable in one horizontal direction.

As shown in FIG. 4, a worm wheel 24 that is concentric with the center of rotation of a saddle 22 is fixed to the bed 21, and a worm wheel 24 that engages with the worm wheel 24 is fixed to the saddle 22.
5 is provided, and the worm 25 is connected to a table rotation motor 26.
driven by. That is, since the worm wheel 24 is fixed to the bed 21, the worm 25 is moved by the drive of the table rotation motor 26, and the saddle 22 is rotated.

On the upper surface of the table 23, a headstock 27 and a tailstock 28 having a main shaft for driving and rotating are placed coaxially, and a gear to be cut 29 as a workpiece is supported by the headstock 27 and the tailstock 28. The center axes of the headstock 27 and the tail dock 28, that is, the support center line of the workpiece gear 29, coincide with the rotation centerline of the saddle 22, and the table 23 moves on the saddle 22 along the support centerline of the workpiece gear 29. It is slidable. The table 23 is driven by a table drive motor 30
It is reciprocated by the drive of.

A column 31 is attached to the bed 21 on the back side of the table 23.
is supported so as to be able to reciprocate in the horizontal direction (front-back direction) intersecting the moving direction of the table 23, and the column 31 is driven reciprocatingly by a grindstone front-rear motor 32. The shape of the column 31 is such that it does not interfere with the goople 23 even if the table 23 turns when the column 31 is closest to the table 23 (see FIG. 3).

A grindstone head 33 protruding toward the table 23 side is provided on the column 31 so as to be movable in the vertical direction, and the grindstone head 33 is moved back and forth wA by a grindstone vertical motor 34. The grindstone head 33 is provided with a horizontal grindstone shaft 35 along the moving direction of the column 31, and the grindstone shaft 35 is driven and rotated by a grindstone drive motor 36. A whetstone 37 is attached to the tip of the whetstone shaft 35,
The grindstone 37 is covered by a grindstone cover 38 fixed to the grindstone head 33.

A grindstone forming device 39 is provided on the headstock 27 so as to be able to rotate around a vertical axis, and the center of rotation of the grindstone forming device 39 coincides with the support center rod of the gear to be cut 29 .

The configuration of the grindstone forming device 39 will be explained based on FIGS. 5 and 6. FIG. 5 shows a cross-sectional side view of the grindstone forming device 39;
The figure shows the plane.

A fixed pace 40 is attached to the headstock 27, and a rotating pace 41 that is rotatable around a vertical axis is supported on the fixed pace 40. A pair of holders 42 are fixed to the upper surface of the rotating base 41, and the holders 42 have a diamond dresser (for truing and dressing the grindstone 37).
dresser) 43 is attached. A cylinder chamber 44 is formed between the fixed pace 40 and the rotating base 41,
A piston 45 is provided in the cylinder chamber 44 .

A clamp 46 is attached to the piston 45, and the disc spring 4
7 forces the piston 45 downward, the clamp 46 engages with the swing base 41, and the swing base 41 becomes unable to swing.

When fluid pressure is supplied to the cylinder chamber 44, the piston 45 moves upward against the spring force of the disc spring 47, and the clamp 4
6 is released from the rotation base 41, and the rotation base 4
1 can turn.

As shown in FIGS. 1 and 2, the grindstone cover 38 is provided with a fixed arm 48 as a coupling device that can rotate around a horizontal axis, and the fixed arm 48 can be fixed to the holder 42 of the grindstone forming device 39. It becomes.

In the gear grinding machine described above, the spindle drive motor (not shown), the table rotation motor 26, the table drive motor 301, the grindstone front and back motor 32, and the grindstone up and down motor 34 are driven by a numerical control device (not shown) provided separately. The drive is controlled.

The operation of the gear grinder having the above configuration will be explained based on FIG. 7. FIG. 7 shows the turning situation of the table 23.

In order to engage the grindstone 37 along the helical tooth groove of the to-be-cut gear 29, the support center line P of the to-be-cut gear 29 and the grindstone center line Q need to be rotated by the helix angle β of the to-be-cut gear 29. In order to set the grindstone 37 to the helix angle β, the table rotation motor 26 is driven to move the worm 25 around the worm wheel 24, and the table 23 is rotated.

Prior to grinding, the grinding wheel 37 is trued and dressed. Move the table 23 and move the table 23
The center of rotation of the grindstone forming device 39 is made to coincide with the center of rotation of the grindstone forming device 39. Rotate the fixed arm 48 downward and fix it to the holder 42, and in this state, rotate the table 23 by the helix angle β of the gear to be cut 29.

Whetstone molding bag ¥! ! The piston 45 of 39 is actuated to release the engagement of the clamp 46 with the swing base 41, thereby allowing the swing base 41 to swing with respect to the fixed base 40.

The worm 25 is rotated by the drive of the table rotation motor 26, and the saddle 22 is set at a predetermined angle (β) with respect to the bed 21.
Rotate. The rotation of the saddle 22 causes the table 23 to rotate at the same angle as the helix angle, and at the same time, the rotating base 41 of the grindstone forming device 39 also rotates at the same angle as the helix angle β with respect to the fixed base 40.
This means that you have made an angular turn. As a result, the holder 42 is rotated by the same angle as the rotation angle of the table 23 without changing the relative relationship between the dresser 43 and the grindstone 37. After rotating the swing base 41, the piston 45 is moved by the spring force of the disc spring 47, the swing base 41 is fixed to the fixed base 40 side by the clamp 46, and the boulder 42 and the fixed arm 48 are released and fixed. Rotate the arm 48 upward. In this state, the grindstone up and down motor 34 is synchronously controlled to move the grindstone 37 along the required forming trajectory, and the dresser 43
Truing and dressing of the grindstone 37 is performed by using the grinding wheel 37.

By fixing the fixed arm 48 to the holder 42 and rotating the table 23, the dresser 43 can be rotated at a predetermined torsion angle with respect to the table 23 together with the grindstone 37.

After truing and dressing of the grindstone 37 is completed, the table 23 is moved and the gear 29 to be cut is ground. Grinding of the gear to be cut 29 in the face width direction is performed by controlling the rotation of the main shaft of the headstock 27 synchronously with the movement of the table 23 (movement of the gear to be cut 29 in the support center line direction) using the following equation (1). .

The amount of movement of the table 23 is L(M), and the rotation angle of the main shaft is θ(
deg), and the helix angle on the pitch circle of the gear to be cut 29 is β. (
deg), and the pitch circle diameter of the gear to be cut 29 is do(deg).
), when the grinding of one tooth of the gear to be cut 29 is completed by synchronous control of the movement of the table 23 and the rotation of the main shaft, the grindstone 37 and the tooth groove are disengaged by driving the grindstone vertical motor 34. Next, the (1/e41 number) rotation main shaft of the gear to be cut 29 is indexed and rotated to engage the grindstone 37 and the tooth groove, and the tooth groove of the gear to be cut 29 is similarly ground by synchronous control. By repeating the above operation a number of times corresponding to the number of teeth of the gear to be cut 29, the grinding of the gold teeth is completed.

When grinding workpiece gears 29 with different helix angles,
The saddle 22 is rotated relative to the bed 21, the table 23 is rotated at a predetermined angle, and the cut gear 29 of the grindstone 37 is rotated.
Change the inclination angle. At this time, by connecting the grindstone head 33 side and the grindstone forming device 39 side with the fixed arm 48, the dresser 43 can be moved relative to the table 23 (workpiece gear 29) while maintaining a constant positional relationship with the grindstone 37. and rotate it.

In the gear grinding machine described above, the intersection angle between the gear to be cut 29 and the grinding wheel 37 is set by rotating the table 23 that supports the gear to be cut 29, so that the grinding wheel head 33 does not require a turning mechanism. space limitations are removed. Also,
Fixed arm 48 allows grinding wheel head 33 side and grinding wheel formation value M39
By connecting the sides and rotating the table 23, the dressers 4, 3 can be rotated at a predetermined angle together with the grindstone 37 with respect to the table 23. This eliminates the need for a synchronous rotation mechanism in the grindstone forming device 39 itself. , the positional relationship with respect to the grindstone 37 can be maintained accurately.

In addition, since the whetstone forming bag W139 is provided on the headstock 27,
The movement stroke of the table 23 from the grinding position of the to-be-cut gear 29 to the truing and dressing positions is shortened, the time for forming the grindstone 37 is shortened, and productivity can be improved.

<Effects of the Invention> The gear grinding machine of the present invention is provided with a grinding wheel forming device on the table side so as to be able to freely rotate around a vertical axis, and is also provided with a connecting device capable of connecting the grinding wheel head and the grinding wheel forming device. By connecting the grindstone head and the grindstone forming device using a coupling device when setting the turning angle of the head, the grindstone forming device can be turned with respect to the table at the same angle as the grindstone head. As a result, the grindstone forming device can be reliably rotated with an extremely simple configuration, and the grindstone forming device can be downsized and the accuracy of truing and dressing can be improved.

[Brief explanation of drawings]

FIG. 1 is a front view of a gear grinding machine according to an embodiment of the present invention;
Fig. 2 is a side view thereof, Fig. 3 is a plan view thereof, Fig. 4 is a sectional view showing the table rotation mechanism, Fig. 5 is a sectional view of the grindstone forming device, and Fig. 6 is a plan view of Fig. 5. 7 is an explanatory view of the table turning, FIG. 8 is a front view of a conventional gear grinding machine, FIG. 9 is a side view thereof, and FIG. 10 is a plan view thereof. In the drawing, 21 is a bed, 22 is a saddle, 23 is a table, 27 is a headstock, 28 is a tailstock, 29 is a gear to be cut, 31 is a column, 33 is a grinding wheel head, 37 is a grinding wheel, 39 is a grinding wheel forming device, 48 is a fixed arm. Patent applicant Mitsubishi Heavy Industries, Ltd. Nagaashi Iron Works Agent

Claims (1)

[Claims] A grindstone forming device is supported on a table side so as to be rotatable around a vertical axis on a support center line of a workpiece, and a connecting device is provided that can connect a grindstone head that supports a grindstone and the grindstone forming device. gear grinding machine.