JP2875869B2 - Machine tool whetstone correction device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grindstone correcting device for a machine tool such as a machining center or a grinding center having a grinding function.

[Conventional technology]

Conventionally, as a machine tool as described above, a horizontally reciprocating table, a saddle supported by a column and horizontally reciprocated in a direction perpendicular to the direction of movement of the table, and a vertically movable vertically supported by the saddle A workpiece supported on the table and having a vertical spindle supported by the spindle head and rotating around the axis and fitted with a cylindrical grindstone made of a CBN grindstone or a diamond grindstone. In some cases, a grinding process is performed using the grinding wheel.

In such a machine tool, grinding is performed by pressing the outer peripheral surface and the lower end surface of the whetstone against a workpiece on a table, but since the outer peripheral surface and the lower end surface of the whetstone are worn and deformed by this processing, A grindstone correction device for correcting these surfaces into a predetermined shape is provided.

As shown in FIGS. 5 and 6, a base 2 is fixed to a table 1 of a machine tool.
Above, the apparatus main body 3 and the truer mounting shaft 4 supported by the main body 3 are inclined upward by 45 ° with respect to the horizontal plane of the table 1. A substrate 5a of a truer 5 is detachably fixed to a tip of the mounting shaft 4 protruding from the apparatus main body 3. Trua 5
The annular portion 5b having a small thickness protrudes from the outer peripheral surface of the substrate 5a, and the annular portion 5b is bent at a right angle from the center in the axial direction, that is, the thickness direction, so that the truing portion becomes a horizontal surface 5c and a vertical surface 5d on the outer periphery. ing.

The grindstone correcting device rotates the truer 5 by rotating the mounting shaft 4 by an electric motor. In this state, the worn cylindrical grindstone 6 is moved while being rotated by the vertical main shaft of the machine tool, so that the lower end surface of the grindstone 6 is pressed against the horizontal surface 5c provided on the annular portion 5b of the ruther 5 for truing. In addition, the outer peripheral surface of the grindstone 6 is trued by a vertical surface 5d provided on the truer 5 annular portion 5b. The truing described above is performed by appropriately moving the saddle, shaft head and table of the machine tool.

[Problems to be solved by the invention]

In a conventional grindstone correcting device for a machine tool, the truer mounting shaft 4 and the truer 5 are inclined at an angle of 45 ° with respect to the axial direction of the main shaft and the roughing stone 6, so that the base 5a of the truer 5 and the thin ring are formed with respect to the mounting shaft 4. The part 5b is at a right angle. During truing, the horizontal surface 5c and the vertical surface 5b provided on the annular portion 5b of the truer 5 are pressed against the lower end surface and the outer peripheral surface of the grindstone 6 at an angle of 45 °. Therefore, as shown in FIG. 7, the horizontal surface 5c of the truer 5 is pressed against the lower end surface of the grindstone 6, and the grindstone 6 is moved to the seventh position.
When the truing is performed while moving horizontally in the direction indicated by the arrow in the figure, the annular portion 5b of the truer 5 is bent by the truing resistance as shown by the chain line in FIG. 7 so that the annular portion 5b bites into the grindstone 6. This can cause chattering during truing. Also, when the outer peripheral surface of the grindstone 6 is trued on the vertical surface 5d of the truer 5 while moving the grindstone 6 upward, similarly to the case of the truing of the lower end surface of the grindstone 6, the annular portion 5b of the truer 5 is formed. It bends and bites into the grindstone 6. Therefore, there is a problem that the grinding wheel 6 cannot be corrected with high accuracy.

The present invention solves the above-described problems by making it difficult for the truer to bite into the grindstone during truing.
It is an object of the present invention to provide a grindstone correction device for a machine tool capable of correcting a grindstone with high accuracy.

[Means for solving the problem]

The grinding wheel correcting device for a machine tool according to the present invention is configured such that a substrate of a truer is fitted on a truer mounting shaft inclined at 45 ° with respect to a main shaft, and the mounting shaft and the substrate are mounted on the substrate with respect to the axial direction of the mounting shaft and the substrate.
Form a frustoconical cylindrical projection that inclines at 45 ° to the tip and expands in diameter toward the tip, and forms a truing surface at the tip of the projection that is orthogonal to the peripheral surface of the projection. The protruding portions are orthogonal to each other, and the end surface and the outer peripheral surface of the cylindrical grindstone fitted to the main shaft are pressed against the truing surface to correct the grindstone.

(Operation)

The whetstone repairing device according to the present invention forms a truncated cone-shaped projection on the substrate of the truer, which is inclined at 45 ° with respect to the axial direction of the truer mounting shaft and the substrate and expands in diameter toward the distal end. Since the truing surface perpendicular to the peripheral surface of the protrusion is formed, when truing the end surface and the outer peripheral surface of the grindstone, the protrusion of the truer is perpendicular to the moving direction of the main shaft and the grindstone, and the tip of the protrusion is formed. Truing can be performed by pressing the truing surface provided on the surface against the end surface and the outer peripheral surface of the grindstone (see FIG. 1). Therefore, even if the protrusion of the truer is bent by the truing resistance, the protrusion does not bite into the grindstone as compared with the above-described conventional one (see FIG. 4), and the chatter phenomenon is less likely to occur, and therefore the grindstone is hardly generated. Can be corrected with high accuracy.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

2 and 3, reference numeral 11 denotes a table supported by a bed (not shown) and horizontally reciprocated in the front-rear (Y-axis) direction. A column 12 is provided upright so as to straddle the table 11,
The column 12 supports a saddle 13 horizontally reciprocating in the left-right (X-axis) direction above the table 11. Saddle 13
Supports a shaft head 14 that vertically reciprocates in the vertical (Z-axis) direction, and the shaft head 14 supports a vertical main shaft 15 that rotates around the axis. A cylindrical grindstone 16 made of a CBN grindstone or a diamond grindstone is detachably fitted to the tip of the main shaft 15 via a holder 17 coaxially therewith. The above configuration is the same as that of a conventional machine tool having a grinding function.

A movable base 18 is fixed to a lower portion of the front of the column 12, and a turning shaft 19 protruding toward the front is fixed to the base (18). A movable table 20 is pivotally supported on the pivot 19 so as to be pivotable in the front-rear direction. A cylinder mechanism 21 is provided below the base 18, and the cylinder mechanism 21 is a cylinder 21a.
Is pivotally attached to the base 18, and the distal end of the piston 21 b is pivotally attached to the movable base 20. In addition, a grindstone correcting device 22 is provided on a mounting surface 20a formed in front of the movable base 20 so as to be located directly below the main shaft 15.

The grindstone correction device 22 is mounted on the mounting surface 20a of
3 is fixed, and a ruer mounting shaft 24 is supported by the apparatus main body 23. The axis of this mounting shaft 24 is the mounting surface 20 of the movable table 20.
The board 25a of the truer 25 is detachably fitted and fixed to the tip of the mounting shaft 24 in parallel with the axis a. An electric motor 26 is fixed in the apparatus main body 23, and the driving shaft of the electric motor 26 rotates the mounting shaft 24 and the truer 25 integrally. As shown in FIG.
At an angle of 45 ° with the axis of the mounting shaft 24 from the outer periphery of the tip of a,
A protruding portion 25b is formed in the shape of a truncated conical cylinder with a divergent outer peripheral surface. Truing surface 2 at the tip of the protruding part 25b
5c is formed, and the truing surface 25c is formed so as to be orthogonal to the outer peripheral surface of the protruding portion 25b. In addition, movable table 20
Is a stopper block 27 for the revolving end, and a stopper bolt 28 for the revolving end against which the stopper block 7 contacts the base 18.
Are screw-fitted, and a locking nut 29 is fastened to the stopper bolt 28. Reference numeral 30 denotes a touch sensor for automatic measurement of a grinding wheel diameter provided on the mounting surface 20a of the movable base 20.

Next, the operation of the grinding wheel correcting device 22 according to this embodiment will be described.

Except when the grindstone 16 is modified, as shown by the solid line in FIGS. 2 and 3, the movable table 20 is raised upright, and the piston 21b of the cylinder mechanism 21 is set in a retracted state. In this state, the movable base 20 and the grindstone correcting device 22 provided on the movable base 20 are located outside the upper surface of the table 11, and the loading and unloading of the workpiece with respect to the upper surface of the table 11, and the lower end surface of the grinding wheel 16 to the workpiece 11 And the outer peripheral surface can be performed without interference with the grindstone correcting device 22.

When the grindstone 16 is worn by the grinding of the workpiece, the cylinder mechanism 21 is operated to move the piston 21b forward without the workpiece on the table 11, and the piston 21b is moved around the turning shaft 19 as shown in FIG. Rotate the movable base 20 counterclockwise,
The mounting surface 20a of the movable base 20 is changed from the vertical position shown by the solid line in FIG. 2 to the horizontal position shown by the chain line in FIG. In this way, the grindstone correcting device 22 enters the table 11 along one side together with the movable table 20, and the stopper block 27 provided on the movable table 20
Abuts against the tip of a stopper bolt 28 attached to the base 18 from below to support the movable table 20 so that the mounting surface 20a is horizontal. When the mounting surface 20a of the movable base 20 is horizontal, the axis 24a of the mounting shaft 24 of the grindstone correcting device 22 is inclined 45 ° upward with respect to the horizontal plane. In this state, while the grindstone 16 is rotated around the axis of the main shaft 15 by the rotation of the main shaft 15, the vertical (Z-axis) movement of the shaft head 14 and the left and right (X
1), the lower end surface of the grindstone 16 is
As shown by the solid line in FIG.
The truing surface 25c of the truer 25, which rotates integrally with the axis 24, is pressed against the truing surface 25c, and the lower end surface of the grindstone 16 is trued and corrected by the truing surface 25c. Also, the spindle
While rotating the grindstone 16 around the axis 15, the shaft head 14 is moved up and down, and the saddle 13 is moved left and right, so that the outer peripheral surface of the grindstone 16 is as shown by the chain line in FIGS. 1 and 2. Then, the outer peripheral surface of the grindstone 16 is trued by the truing surface 25c of the truer 25 rotating around the axis of the mounting shaft 24.

Then, the truing of the lower end surface of the grindstone 16 moves the shaft head 14 downward to lower the grindstone 16 together with the main shaft 15 to a required position, and as shown by a solid line in FIG. The saddle 13 is horizontally moved by the portion located above the truing surface 25c, and the grindstone 16 is moved together with the main shaft 15 in the left-right direction. In this case, the protrusion 25b of the truer 25 is orthogonal to the moving direction of the main shaft 15 and the grindstone 16, and the truing surface 25c provided at the tip of the protrusion 25b is
The truing is performed by pressing against the lower end surface of the 16. For this reason, even if the protrusion 25b of the truer 25 is bent by the truing resistance as shown by a chain line in FIG.
However, since it is possible to reduce the bite of the grinding wheel 16, the chatter phenomenon does not easily occur. In addition, at a position where the lower end surface of the grindstone 16 is separated from the truing surface 25c of the truer 25 by the horizontal movement of the grindstone 16 required times such as one reciprocation, the shaft head 14 is moved downward by a predetermined amount, and the truing surface 25c described above is used. Repeat truing multiple times. After correcting the lower end surface of the grindstone 16 as described above, the saddle 12 and the shaft head 14 are moved, and the grindstone 16 is moved together with the main shaft 15, and as shown by a chain line in FIG. The truing surface 25c of the projection 25b provided
The dressing of the outer peripheral surface of the grindstone 16 is performed while the shaft head 14 is moved up and down by the portion located below and the grindstone 16 is moved up and down together with the main shaft 15. In this case, the protrusion 25b of the truer 25 is orthogonal to the moving direction of the main shaft 15 and the grindstone 16, and the truing surface 25c provided at the tip of the protrusion 25b is
The truing is performed by pressing against the outer peripheral surface of the 16. For this reason, similarly to the case where the lower end surface of the grindstone 16 is trued, the protrusion 25b of the truer 25 can be less likely to bite into the grindstone 16, and the chatter phenomenon does not easily occur. In addition, the grindstone 16 moves up and down the required number of times and the truing surface 25c of the truer 25
The saddle 13 is moved by a predetermined amount to the truer 25 side at a position where the outer peripheral surface of the grindstone 16 is separated from the wheel, and truing is repeated a plurality of times. Either the truing of the lower end surface of the grinding stone 16 or the truing of the outer peripheral surface may be performed first.

After the truing of the lower end surface and the outer peripheral surface of the grindstone 16 is completed, the rotation of the grindstone 16 and the truer 25 is stopped, and the shaft head is stopped.
With the vertical movement of 14 and the horizontal movement of saddle 13,
The main shaft 15 and the grindstone 16 are returned to the positions before truing. Thereafter, the piston 21b of the cylinder mechanism 21 is retracted, and the movable platform 20 is rotated clockwise in FIG.
By rotating the movable table 20, the mounting surface 20a of the movable table 20 becomes vertical, and the grindstone correcting device 22 withdraws from one side of the table 11 together with the movable table 20, and returns to the state before the operation.

In the above-described embodiment, the grindstone correcting device is rotatably mounted on the column, and the grindstone correcting device is advanced onto the table only when the grindstone is corrected. It may be fixedly provided on a table of a machine tool similarly to the conventional apparatus shown.

[Effects of the Invention] As described above, the present invention relates to a grindstone correction device for a main spindle of a machine tool configured to reciprocate in the axial direction of the main spindle and in a direction orthogonal to the axial direction. A machine tool which inclines a truer mounting shaft by 45 ° and corrects an outer peripheral surface and an end surface of a cylindrical grindstone which is fitted to the main shaft and rotates around the axis by a truer fitted to the mounting shaft. In the grindstone correcting device, a truncated cone-shaped protrusion is formed on the substrate of the truer, which is inclined at 45 ° with respect to the axial direction of the mounting shaft and the substrate and expands in diameter toward the tip. Forming a truing surface perpendicular to the peripheral surface of the portion, making the protrusion perpendicular to the moving direction of the main shaft, and pressing the end surface and the outer peripheral surface of the grinding stone against the truing surface, respectively, to correct the grinding stone. Since the, the following effects can be obtained.

That is, the grindstone repairing device according to the present invention forms a truncated cone-shaped projection on the substrate of the truer that is inclined at 45 ° with respect to the axial direction of the truer mounting shaft and the substrate and expands in diameter toward the tip. Since the truing surface perpendicular to the peripheral surface of the protruding portion is formed at the tip of the truing device, when truing the end surface and the outer peripheral surface of the grindstone, the protruding portion of the truer is perpendicular to the moving direction of the main shaft and the grindstone, and Truing can be performed by pressing the truing surface provided on the tip end surface of the grinding wheel against the end surface and the outer peripheral surface of the grindstone (see FIG. 1).
Therefore, even if the protrusion of the truer is bent by the truing resistance, the protrusion does not bite into the grindstone as compared with the above-mentioned conventional one (see FIG. 4). Can be corrected with high accuracy.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a tip of a truer mounting shaft and a truer of a grinding wheel correcting device for a machine tool according to an embodiment of the present invention, and FIGS. 2 and 3 are grinding wheels of a machine tool according to an embodiment of the present invention. FIG. 4 is a front view and a side view showing a part of a repairing device, FIG. 4 is an explanatory diagram showing a state of repairing a grinding wheel by a truer according to the embodiment, and FIG. 5 is a front view showing a grinding wheel repairing device of a conventional machine tool. FIG. 6 is a longitudinal sectional view showing the apparatus main body, the truer mounting shaft and the truer of the conventional example, and FIG. 7 is an operation explanatory view showing a state in which a grinding wheel is corrected by the truer of the conventional example. 11 ... Table, 12 ... Column, 13 ... Saddle, 14 ...
Shaft head, 15 ... Spindle, 16 ... Grindstone, 22 ... Grindstone correction device,
22 ... device main unit, 24 ... truer mounting shaft, 25 ... truer,
25a ... board, 25b ... projecting part, 25c ... truing surface.

Claims (1)

(57) [Claims] 1. A truer mounting shaft of a grindstone correcting device is inclined by 45 ° with respect to the main shaft of a machine tool which reciprocates the main shaft in the axial direction of the main shaft and in a direction orthogonal to the axial direction. In a grinding wheel correction device for a machine tool, which is configured to correct an outer peripheral surface and an end surface of a cylindrical grindstone that is fitted to the main shaft and rotates around the axis by a truer fitted to the mounting shaft, A frusto-conical cylindrical protrusion that is inclined at 45 ° to the axial direction of the mounting shaft and the substrate and expands in diameter toward the tip, and a truing surface orthogonal to the peripheral surface of the protrusion at the tip of the protrusion. Forming, making the projecting portion orthogonal to the moving direction of the main shaft,
A grindstone correction device for a machine tool, wherein an end surface and an outer peripheral surface of the grindstone are respectively pressed against the truing surface to correct the grindstone.