JPS5933510B2 - Grinder - Google Patents

Description

[Detailed description of the invention] The present invention relates to a grinding machine.

In conventional grinding machines, in addition to the cutting feed of the grinding wheel for grinding the workpiece, the cutting feed of the dresser for dressing the grinding wheel, and the correction feed of the grinding wheel for reducing the outer diameter of the grinding wheel due to the dressing. Since the three types of feed are performed separately, each feed pile is equipped with the necessary slide mechanism and actuator.

In addition, conventionally, grinding was done using the plunge cut method, so the feed speed of the grinding wheel head could be changed to rapid feed, air cut, coarse grinding, etc.
In addition to requiring precision tools and mechanisms and actuators for conversion according to the equipment, they were also equipped with a sizing device to measure the degree of grinding of the workpiece. As described above, the conventional grinding machine has a large number of components, has a complicated structure, and has various mechanical operations, which poses problems in terms of work efficiency. Therefore, an object of the present invention is to provide a grinding machine that can reduce the number of component parts, simplify the structure, reduce the number of mechanical operations, and improve work efficiency. It is to be.

In order to achieve the above-mentioned object, the present invention includes a rocking table having a grinding wheel head, which is swingably attached to a base board, a grinding wheel provided at the front part of the grinding wheel head, and a dresser and a workpiece mounted at the front part of the base board. The distance from the axis of the swinging shaft to the outer peripheral edge of the dresser closest to the swinging shaft, and the distance from the axis of the swinging shaft to the outer peripheral edge of the workpiece closest to the swinging shaft after grinding. are substantially equal, and the cam provided on the base plate can guide the cam follower of the rocking table by a cylinder (biasing means) installed between the base plate and the rocking table. The present invention is characterized in that the rocking table is swung by the guide of the cam follower as described above, and the dressing of the grindstone by the dresser and the grinding of the workpiece by the grindstone are performed. An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, a groove 2 is formed in the upper center of the base board 1. As shown in FIGS. A swing shaft 5 is installed between the left and right groove walls 3 and 4 of this groove 2. This swing shaft 5
A rocking table 6 is rotatably supported on the shaft so that the rocking table 6 can swing within the groove 2. A shaft 7 is provided above the rear end portion (right side in the drawing) of the base board 1 via a bracket (not shown), and a sprocket 8 is rotatably supported on this shaft 7. One end of this sprocket 8 is connected to the rear end of the rocking table 6, and a weight 9 is connected to the other end.
A chain 10 connected to the rocking table 6 is hung.
is always energized in the counterclockwise direction in Figure 1. Before operation, the front lower surface of the rocking table 6 comes into contact with the stopper pin 11 installed in the groove 2, so that:
Becomes still. A grindstone head 12 is provided at the front of the upper surface 6a of the rocking table 6.
is placed so as to be movable in the front-rear direction (left-right direction in the drawing) perpendicular to the swing axis 5. Note that a long hole 13 is formed in the grindstone head 12, and the swing shaft 5 is inserted through the long hole 13. At the rear of the grindstone head, there is the swing table 6 behind it.
Screw rod 15 of the cutting device 14 provided above
The tips of the two are connected.

This cutting device 14 rotates the screw load 15 when the cylinder 16 of the device 14 is operated.
The grindstone head 12 is moved forward. A circular grindstone 17 is rotatably provided on the front left side of the grindstone head 12. The belt transmission mechanism 1 is driven by a motor 18 installed on the top surface of the grindstone 12.
It is designed to be actively rotated through 9. but,
As shown in FIG. 3, the axis C2 of the grindstone 17 is located on a straight line L3 passing through the axis C1 of the swing shaft 5 and parallel to the upper surface 6a of the swing table 6. Note that by rotating the thread 21 provided on the left groove wall 3 of the rocking table 6 and connected to the cutting device 14 via a universal joint 20, the screw rod 15 of the cutting device 14 can be rotated. By reversing and retracting the grindstone head 12, the grindstone 17 can be replaced with a new one. At the front end of the base board 1, there is a table 2 having a key 23 on the top surface.
2 is installed.

On this table 22 are a headstock 24 and a tailstock 25.
are installed on the left and right, respectively, in a state where they are positioned by a key 23, and a dresser fine adjustment device 26 is installed between these stands 24, 25. The dresser fine adjustment device 26 is provided with a dresser stand 27 on the rear surface thereof so as to be movable in the front and rear directions by means of a handle 28 of the device 26. The dresser 29 is attached to the shaft 3 on the dresser table 27.
0 and is rotatably supported. This shaft 30 is
A rotary shaft 33 is actively rotated via a belt transmission mechanism 32 by the drive of a motor 31 attached to the tailstock 25.
They are connected via a joint 34 such as a universal joint. However, the axis C3 of the dresser 29 is
As shown in the figure, it is located on a horizontal straight line L1 passing through the axis C1 of the swing shaft 5. In addition, the headstock 24 and the tailstock 2
5 has protruding centers 35 and 36 facing each other, and a workpiece 37 can be held between the two centers 35 and 36. The workpiece 37 is mounted on the headstock 2
The center 35 is fixed and actively rotated without rotating by driving the motor 38 attached to the center 35 via a belt transmission mechanism (not shown). As shown in FIG. 3, the axial center C4 of the workpiece 37 is located above the dresser 29 from the axial center C1 of the swing shaft 5 to the outer peripheral end of the dresser 29 closest to the swing shaft 5. It is provided at a position where the distance to P1 and the distance from the axis C1 of the swing shaft 5 to the outer peripheral end P2 of the workpiece 37 closest to the swing shaft 5 after grinding are approximately equal. The outer circumferential end P1 of the dresser 29 is the same as the point where the straight line L1 connected from the axis C1 of the swing shaft 5 to the axis C3 of the dresser 29 intersects the outer circumference 29a of the dresser 29. The outer circumferential end P2 after grinding is the same as the point where the straight line L2 connected from the axis C1 of the swing shaft 5 to the axis C4 of the workpiece 37 intersects the outer circumference 37a of the workpiece 37 after grinding. In FIG. 3, the reference numeral 37b indicates the workpiece 3.
7 shows the outer periphery before grinding. A cam follower 40 is attached to the rear left side surface of the swing table 6.

The cam follower 40 is adapted to abut and be guided by an outer circumferential surface 43 of a cam 42 rotatably supported by a shaft 41 on the base board 1 below. This cam 42
is actively rotated by the drive of a motor 47 installed on the base board 1 via a reduction gear (not shown). Further, a cylinder 44 is installed between the lower part of the base board 1 and the rear part of the rocking table 6. Upon the start of grinding, this cylinder 44 applies a predetermined load to the rocking table 6 and rotates the outer peripheral surface of the cam 42.
The cam follower 40 is brought into contact with the cam 3, and the cam follower 40 expands and contracts so as to follow the rotation of the cam 42.
Therefore, the rotation of the cam 42 causes the cam follower 40 to
By being guided, the rocking table 6 is rocked in a seesaw shape around the rocking shaft 5. The shape of the cam 42 is such that the radius from its axis to the outer circumferential surface 43 gradually becomes shorter from 0 degrees at the start of rotation to about 180 degrees, and the radius gradually becomes longer from about 180 degrees to 360 degrees. When the cam follower 40 comes into contact with the longest radius, the rocking table 6 floats from the stopper pin 11, and the grinding wheel 17 is set on the dresser 29 as desired from below. The shortest radius is set so that the cam follower 40 comes into contact with it so that the axial center C2 of the grindstone 17 can be located on the straight line L2 connecting the axial center C1 of the swing shaft 5 and the axial center C4 of the workpiece 37. has been done.
A coolant pan 45 is laid in the groove 2 of the base plate 1, and is configured to discharge high-temperature coolant used during grinding to the outside from a discharge port 46. The expansion and deformation force of the base board 1 due to the exposure of the board 1 is recommended.

When the above-mentioned grinding machine is started, the cylinder 44 is shortened, and the rocking table 6 is rotated in the clockwise direction in FIG. As the cam follower 40 moves away from the stopper pin 11, the cam 4
2. As the cam follower 40 is guided by the rotation of the cam 42, the rocking table 6 rotates in the normal direction around the rocking shaft 5. Note that, before the rocking table 6 swings, the grindstone 17 is previously positioned at the cutting position. Rocking table 6
As the grindstone 17 rotates in the normal direction, the grindstone 17 comes into contact with the dresser 29 from slightly before the outer peripheral end P1 and is dressed, and the dressing ends at the outer peripheral end P1. Next, when the rocking table 6 is further rotated in the normal direction, the grinding wheel 17 contacts the Kirk 37 from slightly before the outer peripheral end P2 after grinding, grinds the workpiece 37, and the grinding ends at the outer peripheral end P2. . Thereafter, the rocking table 6 is rotated (hereinafter referred to as inversion) counterclockwise in FIG. , the above operation is repeated again. Note that the workpiece 37 is replaced between the end of grinding by the grindstone 17 and the end of dressing of the grindstone 17 by the dresser 29. Note that when reducing the outer diameter of the workpiece 37, the dresser 29 is moved in the direction away from the axis C1 of the swing shaft 5 by the dresser fine adjustment device 26. Alternatively, when increasing the outer diameter of the workpiece 37, the dresser 29 may be moved in the direction closer to the axis C1 of the swing shaft 5 using the dresser fine adjustment device 26, contrary to the above. . Furthermore, in the above embodiment, the cutting device 14 feeds the grinding wheel 17 to the cutting position before the rocking table 6 starts normal rotation. This may be done while the moving table 6 is being inverted, or it may be done while the axis C2 of the grindstone 17 is located on the straight line L1 connecting the axis C1 of the swing shaft 5 and the axis C3 of the dresser 29. Good too. Further, after grinding the workpiece 37 with the grindstone 17, the grindstone 17 can be sparked out to a predetermined position, and then the rocking table 6 can be reversed. Further, after the workpiece 37 is ground by the grindstone 17 by normal rotation of the rocking table 6, the rocking table 6
It is also possible to redress the grindstone 17 by the dresser 29 by reversing the rotation, and by rotating the rocking table 6 in the normal direction again, the workpiece 37 can be finished ground by the grindstone 17 and sparked out. Further, the workpiece 37 can also be ground with the grindstone 17 when the rocking table 6 is reversed. In addition, dresser 29 and work 37
It is also possible to convert the positional relationship of The grinding machine of the above embodiment is a so-called cylindrical grinding machine, and as shown in FIG. By providing the table 22 on the base board 1 so that the table 22 intersects at an angle θ, the outer peripheral surface 37A of the workpiece 37 shown in FIG. 5 and the end surface 37 of the flange 37B formed on the workpiece 37
It is possible to obtain a so-called angular grinding machine that can grind C and C at the same time.

In addition, in FIG. 4, the grindstone 17 rotates on the front right side of the grindstone head 12, and has almost the same structure as the above embodiment, except that its outer peripheral surface has a cross-sectional shape. Therefore, the same parts are designated by the same reference numerals as in the embodiment, and the explanation thereof will be omitted. In other words, the present invention is a system in which the grinding wheel of a grinding wheel mounted on the rocking table is moved in an arc shape by the swinging of the rocking table, and the dressing of the same grinding wheel is performed by the dresser, and the workpiece is ground by the same grinding wheel. Therefore, it is a so-called tangential grinding type grinding machine that can use the grinding wheel to grind a workpiece by moving the grinding wheel in the tangential direction while being dressed with a dresser.

Therefore, unlike conventional plunge cut type grinding machines, there is no need to compensate for the reduction in the outer diameter of the grinding wheel due to dressing. There is no need to convert the feed rate, and grinding can be performed using a size-matching method, and a sizing device can also be eliminated. Therefore, the present invention simplifies the control device by eliminating various mechanisms required in the conventional ones, reduces the number of component parts as much as possible, and simplifies the structure. The operation of the mechanism is reduced, the work efficiency is improved, the reliability of the device is improved, and the maintainability is also improved.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention, FIG. 1 is a schematic right side view of the grinding machine, FIG. 2 is a plan view,
Fig. 3 is an explanatory diagram showing the arrangement relationship between the grinding wheel, dresser, and workpiece, and Figs. 4 and 5 show other examples. Fig. 4 is a schematic plan view of the grinding machine, and Fig. 5 is the workpiece. FIG. 1... Base board, 5... Swing axis, 6...
...Rocking table, 12... Grinding wheel stand, 17...
...Whetstone, 29...Doretsusa, 37...
... Work, 40 ... Cam follower - 42.
...Cam, 44...Cylinder (biasing means), 18, 31, 38, 47...Motor (drive source), Cl, C2, C3, C4... ...Axis center, Pl
, P2...Outer circumference M.

Claims (1)

[Claims] 1 A rocking table is attached to the base plate so as to be swingable via a rocking shaft, and a grindstone head is provided on the rocking table so as to be movable in the front and back direction orthogonal to the rocking shaft. A grindstone that is actively rotated by a drive source is installed in the front part of the base plate, and a dresser and a workpiece that are actively rotated by a drive source are installed in the front part of the base board, and the dresser and the workpiece are placed in the front part of the base plate from the axis of the oscillating shaft to the oscillating shaft. A cam is installed on the rocking table so that the distance to the outer peripheral edge of the dresser in contact with the dresser is approximately equal to the distance from the axis of the swinging shaft to the outer peripheral end of the workpiece closest to the swinging shaft after grinding. A follower is provided, a cam that is actively rotated by a drive source is provided on the base plate, and a predetermined cam is provided on the swing table between the base plate and the swing table so that the cam follower is guided by the cam. By installing a biasing means for applying a load and swinging the rocking table through a cam follower by the guide of the cam, dressing of the grindstone by the dresser and grinding of the workpiece by the grindstone are performed. A grinding machine characterized by: