JPH0222215Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a traverse device for oscillating a grinding wheel with a small amplitude in the grinding wheel axis direction (Z-axis direction) in a grinding machine, particularly an internal grinding machine.

When grinding the inner circumferential surface of a workpiece with a small-diameter grinding wheel on a grinding machine, especially an internal grinding machine, the accuracy decreases in a short period of time due to wear of the grinding wheel. Guaranteed grinding accuracy. A conventional traverse device for oscillating a grinding wheel uses an oscillating member that includes a movable table on which the grinding wheel head is mounted, which is separate from the Z-axis feeding member. For this reason, installation space for the oscillating member is required on the movable table that has the grinding wheel and the grinding wheel head, and since it is separated from the Z-axis feed member, the accuracy of stopping the movable table in a fixed position in the Z-axis direction is poor. The device becomes complicated.

The traverse device of the present invention eliminates the drawbacks and problems found in the conventional devices described above.The traverse device of the present invention eliminates the drawbacks and problems found in the conventional devices. To guarantee the accuracy of Z-axis feeding of a grindstone and to compactly configure a traverse device with an oscillating function by stopping a feeding threaded rod attached to the structure and oscillated by an oscillating member at a fixed position. succeeded in.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A grindstone traverse device for a grinding machine according to the present invention will be described below with reference to the drawings. Figures 1 to 3
In the figure, two guide rails 2 and 3 are laid on the base 1 of the grinding machine K in the left-right direction (Z-axis direction) on the paper of the drawing, and the lower surface of the moving table (Z-axis table) 4 is installed on the base 1 of the grinding machine K. The sliding bodies 5 and 6 are engaged with each other. The moving table 4 screws together the nut 8 of the boss 7 attached to the lower surface of the right end (in the drawing) with the threaded rod 10 for feeding the Z-axis, and rotates the moving table 4 in the Z-axis direction within the two guide rails 2 and 3 of the base 1. Bearing bodies 11 and 12 fixed at left and right positions on the lower surface of the base support both ends of the threaded rod 10. with this,
The moving table 4 moves the grindstone 20 in the Z direction by forward and reverse rotation of the threaded rod 10.
Reciprocates in the axial direction. The threaded rod 10 is connected to a pulley 13 which is spline-engaged to the threaded rod 10 in a bearing body 12 on one side of the base opposite to the grinding wheel, and is wound around the feed motor M1 via a belt 14, and the motor M1 is rotated in the forward and reverse directions. Rotated by a drive. 1
5 is the disc of the disc brake DB, and the threaded rod 10
is engaged with the spline 10a at the left end of the
A pair of parts of a brake 16 attached to the base 1 press the disc 15 to restrain the rotation of the threaded rod 10. Further, the threaded rod 10 is attached to two bearing bodies 11 and 12 such that the slide bearing 1 is movable in the axial direction.
It was approved on 7.18. Next, regarding the oscillating member OT of the grinding wheel 20, the right end 10 of the threaded rod 10 is
b is rotatably coupled to the left end surface of a sliding body 22 that is engaged with a cross roller bearing (linear bearing) 21 fixed to the base 1 side. A pin 23 is attached to the right end surface of the sliding body 22, and the right end of a crank rod 24 pivotally connected to the pin 23 is attached to the motor M2 with a brake for the oscillator.
It is eccentrically connected at 7. That is, a motor M2 with a brake is mounted in a vertical position on the right side wall of the base 1, and a rotating shaft 25 extending from the rotating shaft of this motor is supported by a bearing sleeve 26, and has a disk 25a at its upper end. An engagement groove 25b is provided on the upper surface of the disc 25a.
is carved into this groove, and a piece body 28 having a pin 27 implanted thereon which is pivotally connected to the right end of the crank rod 24 is slidably engaged, and by adjusting the tightening of the bolt 29 and nut 30, the rotating shaft 25 The eccentricity x from the center of the pin 27 to the center of the pin 27 can be finely adjusted. Then, with the disc brake DB, threaded rod 10
While the rotation of the disc 25a is restrained, the oscillating brake motor M2 is driven to move the disc 25a from 20 to
When rotated to about 300 rpm, the crank rod 24 reciprocates the sliding body 22 with a 2x stroke, and the threaded rod 10 also reciprocates in the Z-axis direction, which is the rotational axis direction of the grindstone 20, with a 2x stroke. The stopping position of the crank rod 24 is the back dead center (stopped at a fixed position) BDC of the crank rods 24, 25a rotating clockwise as shown in FIG. When the crank rod 24 is stopped at a fixed position BDC, when the crank rod 24 is detected by the proximity sensor S installed near θ=20° in front of the crank rod 24, the brake motor M
A built-in brake (with a clutch) in the rotary shaft 25 suddenly stops the rotating shaft 25, and has the function of a fixed position stopping mechanism that sets the crank stopping position at this time to back dead center (fixed position stopping) BDC.

Reference numeral 31 denotes a grindstone head (grindstone table) on which a grindstone head 32 and a motor M3 for driving the grindstone 20 are mounted. The sliders 35 and 36 on the lower surface are engaged with each other, and are moved in the X-axis direction by an X-axis feed rod (threaded rod) 37 of an X-axis feed motor M4. The high-speed rotating shaft 39 of the grinding wheel head 32, which is wound around the drive motor M3 and the belt 38, rotates the grinding wheel 20 at high speed, and the grinding wheel is fed in the Z-axis direction by the motor M1 and fed by the motor M2 with a brake. Therefore, traverse in the Z-axis direction, motor M4
The feed in the X-axis direction is applied by respectively.

The grinding machine of the present invention is constructed as described above, and the feeding and traverse action of the grinding wheel 20 in the Z-axis direction will be explained. As shown in Figure 1, the grinding wheel 20 located at the origin a is sent to the grinding point b, where it oscillates between b and c with a stroke of 2x, and returns to the origin a again, repeating the cycle (in the figure, the grinding wheel 20 7). First, the grindstone 20 at the origin a
The feed rod and threaded rod 10 are driven by the reverse rotation of the motor M1.
is rotated counterclockwise to move the movable table 4 in the Z-axis direction toward the workpiece, thereby transporting the grindstone 20 from the origin a to the grinding point b. When the grindstone 20 reaches the grinding point b, the motor M1 is stopped and at the same time the disc brake DB is activated and the threaded rod 1
0 rotation suddenly stops. Next, motor M with brake
2 is activated to rotate this rotary shaft 25, and actuate the crank rod 24 which is pivotally connected by an eccentric amount x. As a result, the threaded rod 10 whose rotation is still restrained by the brake DB reciprocates with a stroke amount of 2x, and this movement is transmitted to the grindstone 20 via the movable table 4 and the grindstone head 31. Therefore, the grindstone 20 rotated at high speed by the motor M3 moves 2x between the grinding points b and c.
is oscillated during grinding with a stroke amount of At the end of the grinding, the proximity sensor S detects the rotational position of the crank rod 24, and at this timing angle (θ), the built-in brake of the brake-equipped motor M2 is activated to suddenly stop the rotating shaft 25. Now the crank rod 24
is again stopped at a fixed position at the back dead center (stopped at a fixed position) BDC as shown in FIG. continue,
Brake DB is released and motor M1 is driven forward. Now, the threaded rod 10 rotates normally and the grinding wheel 20
is pulled back from the grinding point b to the origin a, and one cycle of the grinding process is completed. Thereafter, the above cycle is repeated again after replacing the workpiece. The traverse amount 2x of the grindstone 20 can be achieved by finely adjusting the eccentricity x of the pin 27 using the bolt 29 and nut 30.
Further, the crank rod 24 may be stopped at a fixed position not only at a back dead center (stop at a fixed position) BDC but also at a front dead center FDC. Furthermore, whetstone 2
The type of the brake DB that restricts the rotation of the feed threaded rod 10 during the zero oscillation is not limited to the one shown in the drawings, and may be a drum type electromagnetic brake.

According to the present invention, in a grinding machine equipped with a mechanism for sending a grindstone shaft in the Z-axis direction using a motor and a threaded rod, and a traverse device that oscillates in the Z-axis direction, the threaded rod is configured to restrain rotation of the threaded rod. In addition to installing a brake member between the moving table and the threaded rod, both ends of the threaded rod are supported so as to be swingable in the Z-axis direction, and one end of the threaded rod is rotatably connected to a sliding body attached to a linear motion bearing. , an oscillating member is formed on the drive side of the sliding body to pivotally connect one end of a crank rod which is pivotally connected to a pin eccentric to a rotating disk of a motor with a brake, and the back-dead center of the crank rod is Equipped with a fixed position stop function that detects the front dead center using a sensor member and suddenly stops the motor with the brake, it is of course possible to oscillate (traverse) the grinding wheel without compromising Z-axis feed accuracy. Since the oscillation mechanism is integrated into the threaded rod that is the Z-axis feed rod, the Z-axis
The entire shaft feeding device can be configured compactly.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the Z-axis feeding device of the grinding machine of the present invention, FIG. 2 is a right sectional view, and FIG. 3 is a plan view of the oscillating member. K...Grinding machine, 1...Base, 4...Moving table, 7
...Boss, 8...Natsuto, 10...Feeding rod (threaded rod), 20...Whetstone, 31...As soon as it runs out, 32...
... Grinding wheel head, OT... Oscillating member (22...
...Sliding body, 23, 27... Pin, 24... Crank lever, 25... Rotating shaft, 25a... Disc, 26...
... Bearing tube, 28 ... Bridge body, 29 ... Bolt, 30
... Nut, M2 ... Motor with brake), M1,
M2, M4...Motor, x...Eccentricity, DB...
Brake member, BDC... Back dead center (stop at fixed position), S... Proximity sensor.

Claims (1)

[Scope of utility model registration request] A grindstone head that moves the whetstone head in the X-axis direction of a plane perpendicular to the whetstone axis, and a movable table that carries the whetstone head and is mounted on a base, are equipped with a motor and a threaded rod to move the whetstone axis in the Z direction. In a grinding machine equipped with a mechanism for sending in the axial direction and a traverse device that oscillates in the Z-axis direction, a brake member for restraining rotation of the threaded rod is installed between the threaded rod and the movable table, and
The threaded rod is supported at both ends so as to be swingable in the Z-axis direction, and one end thereof is rotatably connected to a sliding body attached to a linear motion bearing, and a motor with a brake is connected to the driving side of the sliding body. An oscillator member is configured to pivotally connect one end of a crank rod that is pivotally connected to a pin eccentric to the rotating disk, and a sensor member detects the back dead center or front dead center of the crank rod. A grinding machine characterized by being equipped with a fixed position stop function that suddenly stops a motor with a brake.