JP3050904B2 - Machine tool with grinding function - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial applications]

The present invention relates to a machine tool having a grinding function, such as a machining center or a gliding center.

[Prior art]

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 an axis supported by the saddle and vertically moved up and down A head having a spindle supported by the shaft head, rotating around the axis and having a cylindrical grindstone mounted thereon, wherein the workpiece clamped on the table is subjected to grinding by the grindstone. was there. In this machine tool, grinding is performed by pressing the outer peripheral surface and the lower end surface of the whetstone against the workpiece clamped on the table, but the outer peripheral surface and the lower end surface of the whetstone are worn and deformed by this processing. It is necessary to truing these surfaces to correct them to a predetermined shape. Therefore, conventionally, as shown in FIGS. 6 and 7,
Truing device 2 on one side of table 1 of machine tool
Is fixed, and the whetstone 3 worn using the truing device 2 is used.
Has been modified by truing. That is, the truing apparatus 2 includes an apparatus main body 5 provided on a base 4 fixed to the table 1,
And the truer mounting shaft 6 supported by the table 1
Is inclined upward by 45 ° with respect to the horizontal upper surface of. A tip of the mounting shaft 6 projects from the apparatus main body 5, and a substrate 7a of a truer 7 is detachably fitted and fixed to the tip. An annular portion 7b protrudes from the outer peripheral surface of the truer substrate 7a, and the annular portion 7b is bent at a right angle from the center in the axial direction, that is, the thickness direction, so that the truing is formed on the outer periphery to be a horizontal surface 7c and a vertical surface 7d. The truer 7 is rotated by rotating the mounting shaft 6 by an electric motor (not shown). In this state, by moving the worn whetstone 3 while rotating it, the lower end surface of the whetstone 3 is pressed against the horizontal surface 7c of the annular portion of the truer 7 to perform truing, and the outer peripheral surface of the whetstone 3 is set at the annular portion of the truer 7 Truing is performed by pressing against the vertical surface 7d. The truing is performed by appropriately moving the saddle, the shaft head, and the table. Further, as shown in FIGS. 6 and 7, a touch sensor 8 for automatic measurement of the grindstone diameter is fixed on one side of the table 1, and the touch sensor 8 is moved in the front-rear direction of the truing device 2 and the table 1. Are spaced apart from each other. Then, the tracing stylus of the tip of the touch sensor 8 is provided on one side and the other side of the outer peripheral surface of the grinding stone 3 after the truing is completed.
The diameter of the grindstone 3 is measured from two positions of the grindstone 3 by abutting 8a, and the movement of the saddle at the next truing of the grindstone is controlled according to the measured value.

[Problems to be solved by the invention]

In a conventional machine tool such as a machining center having a grinding function, a truing device and a touch sensor for measuring a grindstone diameter are fixed on a table. In order to avoid interference with the device, the touch sensor, and the grinding wheel during truing, the size of the table upper surface is limited, and there is a problem that the table upper surface cannot be used effectively. A machine tool having a grinding function according to the present invention solves the above-described problems by moving a truing device between a first position within a movable range of a grindstone and a second position outside a movable range of the grindstone. In the first position, the truing of both the outer surface and the lower end surface of the grindstone can be accurately performed by one truer, and the second true
In this position, the truing device can be retracted out of the table, a jig or a work can be installed without interference with the truing device, and the upper surface of the table can be used effectively. .

[Means for Solving the Problems]

A machine tool having a grinding function according to claim 1 of the present invention is a machine tool having a grinding function in which a main shaft on which a grindstone is mounted with respect to a table supporting a workpiece is provided so as to be relatively movable in a three-dimensional direction. A movable table base fixed to a member that relatively moves in the axial direction of the main axis with respect to the main axis and in a direction perpendicular to the axial direction, and mounted on the movable table base, above the table by an actuator, A movable table movable between a first position within the movable range of the whetstone and a second position outside the edge of the table and outside the movable range of the whetstone; A mounted main body, a mounting shaft rotatably supported by the main body, and a frusto-conical frusto-conical extension mounted on the mounting shaft and inclined at an angle of 45 ° with respect to the axis of the mounting shaft. Tsu And a means for positioning the movable table at a position where the axis of the mounting shaft intersects the axis of the main shaft at an angle of 45 ° at the first position. The truing surface is parallel to an outer surface and a lower end surface of the whetstone at the first position of the movable base. According to a second aspect of the present invention, in the machine tool having the grinding function according to the first aspect, a touch sensor for automatically measuring a grindstone diameter is provided on a movable table.

[Operation]

A machine tool having a grinding function according to the invention of claim 1 is:
When the movable table is retracted to the second position, which is outside the table, the truing device provided on the movable table is moved to the second position outside the table, except when the worn wheel is corrected. 2, the workpiece and the jig of the workpiece can be easily installed on the table without interference by the truing device, and the upper surface of the table can be used effectively. Further, at the time of repairing the grindstone, by operating the actuator to set the movable table to the first position on the inside of the table, it is possible to set the movable table to a position suitable for using the truing device provided on the movable table, Even when the truing device is moved between the first position and the second position, the truing on both the outer surface and the lower end surface of the grinding stone can be accurately performed by one truer. According to a second aspect of the present invention, in the machine tool having the grinding function according to the first aspect, the movable table is provided with a touch sensor for automatic measurement of the grinding wheel diameter, so that the grinding wheel is corrected and the corrected grinding wheel diameter is automatically measured. It can be performed. Then, after the measurement, the touch sensor can be retracted to the outside together with the movable table by the return operation of the actuator, and the touch sensor can be returned to the outside on the table together with the truing device.

【Example】

FIGS. 1 to 5 show an embodiment of the present invention.
This will be described with reference to the drawings. 1 and 2, reference numeral 11 denotes a bed.
11 is a table 12 that reciprocates horizontally in the front-back (Y-axis) direction.
Is supported. A column 13 is erected so as to straddle the table 12.
A saddle 14 that horizontally reciprocates in the left-right (X-axis) direction orthogonal to the direction of movement of 12 is supported. The saddle 14 supports a shaft head 15 that vertically reciprocates in the vertical (Z-axis) direction, and the shaft head 15 supports a main shaft 16 that is a vertical axis that rotates around the axis. As shown in FIG. 3, a cylindrical grindstone 17 is detachably mounted on a tip end of the main shaft 16 via a holder 18. The above configuration is the same as that of a machine tool having a conventional grinding function such as a machining center. As shown in detail in FIGS. 3 and 4, a movable base 19 is fixed to the lower part of the front of the column 13, and a turning shaft 20 protruding forward is fixed to the base 19. A movable table 21 is pivotally supported on the pivot axis 20 so as to be pivotable in the left-right direction. A cylinder mechanism 32 as an actuator is provided at a lower portion of the base 19, and the cylinder mechanism 32 has a distal end of a cylinder 32a pivotally attached to the base 19, a distal end of a piston 32b pivotally attached to the movable base 21, and a shaft. The direction extends horizontally horizontally. In addition, a mounting surface 21a formed on the front of the movable base 21 includes:
Truing device 22 and touch sensor for automatic measurement of grinding wheel diameter
23 are provided so as to be located directly below the main shaft 16 as shown in FIG. The truing device 22 is disposed at a position close to the turning shaft 20, the mounting body 24 is fixed to the mounting surface 21a of the movable base 21,
A mounting shaft 25 of a truer 26 is supported by the mounting body 24.
The mounting shaft 25 is arranged so that the axial direction is parallel to the mounting surface 21a of the movable base 21, and the tip of the mounting shaft 25 protrudes from the apparatus main body 24, and the substrate 26a of the truer 26 is detachably fitted to the protruding portion. The projection 26b is provided integrally with the substrate 26a. An electric motor 28 is fixed in the apparatus main body 24, and the driving shaft of the electric motor 28
26 are configured to rotate together. The movable table 21 is provided with a stopper block 29 for the turning end, a stopper bolt 30 for the turning end is screw-fitted to the base 19, and a locking nut 31 is fitted to the stopper bolt 30.
Are screw-fitted. Then, as shown by a chain line in FIG. 3, a first position within the movable range of the grindstone 17 above the table 12 and an outer side of an edge of the table 12 as shown by a solid line in FIG. The movable table 21 can be moved to and from a second position outside the movable range of the grindstone 17. The touch sensor 23 has the same configuration as the conventional one shown in FIGS. 6 and 7, is provided with a tracing stylus 23a, and outputs a contact signal upon contact with the grindstone 17. Further, the touch sensor 23 is fixed to the mounting surface 21a of the movable base 21 at a position far from the pivot 20 and apart from the truing device 22. As shown in FIG. 5, the protrusion 26b of the truer 26 is connected to the axis 25a of the mounting shaft 25 from the outer periphery of the tip of the substrate 26a.
The inner and outer peripheral surfaces are inclined at an angle of 45 ° and are formed in the shape of a converging frustoconical cylinder with an inclined surface. . Next, the operation of the machine tool according to this embodiment will be described. Except at the time of repairing the grindstone 17, as shown by the solid line in FIGS. 3 and 4, the movable table 21 is raised upright to the second position, and the piston 32b of the cylinder mechanism 32 is advanced. Keep it. In this state, the movable base 21 and the truing device 22 and the touch sensor 23 provided on the movable base 21 are located outside the upper surface of the table 12, and the workpiece and the truing device 22 are not interfered by the truing device 22 and the touch sensor 23. The jig for the workpiece can be set on the table 12. Accordingly, the upper surface of the table 12 is effectively used, the work is carried into the upper surface of the table 12, the work is clamped to the table 12 by a jig, and the work is ground by a grindstone 17, and after this processing, Unclamp of workpiece, table of workpiece
12 Unloading from the upper surface can be performed in the same manner as a normal machine tool. When the grindstone 17 is worn by the grinding of the workpiece, the cylinder mechanism 32 is moved without the workpiece on the table 12.
To retract the piston 32b, rotate the movable table 21 in the counterclockwise direction in FIG. 3 about the pivot shaft 20, and move the mounting surface 21a of the movable table 21 from the vertical position shown by the solid line in FIG. At the position indicated by the chain line in FIG. This way,
Along with the movable table 21, a truing device 22, a touch sensor 23
Enters on one side of the table 12, and a stopper block 29 provided on the movable base 21 comes into contact with a tip of a stopper bolt 30 attached to the base 19 from below, so that the mounting surface 21 of the movable base 21
a is supported so as to be horizontal, which is the first position.
The position of the stopper bolt 30 vertically screwed to the base 19 is adjusted in the vertical direction, and the nut 31 screwed to the bolt 30 is tightened to the base 19, thereby enabling the movable table 21 to be moved. The mounting surface 21a can be kept in a horizontal position with high accuracy. When the mounting surface 21a of the movable base 21 is in the horizontal position, the axis 25a of the mounting shaft 25 of the truing device 22
状態 It will be in an upwardly inclined state. In this state, while rotating the grindstone 17 around the axis of the spindle 16 by the rotation of the spindle 16,
The shaft head 15 moves vertically (Z-axis) upward and the saddle 14 moves left and right (X
3), the lower end surface of the grindstone 17 is rotated around the axis of the mounting shaft 25 by the driving of the electric motor 28, as shown by the solid line in FIGS. 26 to make contact with the truing surface 26c.
Truing the lower end surface of the grindstone 17 with. Also, while rotating the grindstone 17 around the axis of the spindle 16, the shaft head
Move the saddle 14 up and down 15 and the saddle 14
As shown by a chain line a in FIG. 3 and FIG.
The truing surface 26c of the truer 26 rotating around the axis of the mounting shaft 25 is pressed into contact with the truing surface 26c.
Truing the outer peripheral surface of. Either the truing of the lower end surface of the grindstone 17 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 17 is completed, the rotation of the grindstone 17 and the truer 26 is stopped, and the shaft head is stopped.
15 and the saddle 14 are moved in the left and right directions. As shown by a chain line b in FIGS. 3 and 5, a measurement provided at the tip of the touch sensor 23 on one side of the outer peripheral surface of the grindstone 17 is performed. Child 23a
To measure the position of the grindstone 17 in the left-right direction, and then move the shaft head 15 and the saddle 14 to move along the diameter line of the grindstone 17 as shown by a chain line c in FIGS. The tracing stylus 23a of the touch sensor 23 is brought into contact with both sides of the outer peripheral surface. And whetstone 1
7. The control device of the machine tool for measuring the diameter of the grindstone 17 from the two measurement positions 7 and controlling the movement (cutting position) of the saddle 14 at the next truing of the grindstone according to the measured value. (Not shown). After measuring the diameter of the grindstone 17, the piston 32b of the cylinder mechanism 32 is advanced, and the movable base 21 is rotated clockwise in FIG. The truing device 22 and the touch sensor 23 together with the movable base 21 are retracted from one side of the table 12 and returned to the second position before the operation. The above operation has been described in the case where there is no workpiece on the table 12, but even if the workpiece is clamped on the table 12 by moving the table 12 to the front side end, If the truing and the measurement of the grindstone diameter are performed, the interference between the workpiece on the table 12 and the truing device 22 can be avoided. In the above-described embodiment, the movable table is rotatably mounted on the column via the movable table base. However, in the present invention, the movable table is supported on the column of the movable table so as to be able to advance and retreat, and can be advanced and retracted by an actuator such as a cylinder mechanism. It may be attached to.

【The invention's effect】

A machine tool having a grinding function according to the invention of claim 1 is:
It is attached to the movable base,
A movable table movably provided between a first position within the movable range of the whetstone above the table and a second position outside the movable range of the whetstone outside the edge of the table; By doing so, except for correcting the worn whetstone at the first position, the truing device provided on the movable table can be retracted to the outside on the table by retreating to the outside on the table. The workpiece can be set at the certain second position, so that the workpiece and the jig of the workpiece can be easily installed on the table without being interfered by the truing device, and the upper surface of the table can be used effectively. When the grindstone is corrected, the truing device is moved to a position suitable for using the truing device provided on the movable table by operating the actuator to move the movable table to the first position inside the table. And the second position, it is possible to accurately truing both the outer surface and the lower end surface of the grindstone with one truer. According to a second aspect of the present invention, in the machine tool provided with the grinding function according to the first aspect, the movable table is provided with a touch sensor for automatic measurement of the grinding wheel diameter, so that the grinding wheel is corrected and the corrected grinding wheel diameter is automatically measured. It can be performed. Then, after the measurement, the touch sensor is retracted to the outside on the table together with the movable base by the return operation of the actuator,
The touch sensor can be returned to the outside on the table together with the truing device. Therefore, while the movable table and the truing device provided on the movable table and the touch sensor can be easily taken in and out, the upper surface of the table can be effectively used without being restricted by the truing device and the touch sensor.

[Brief description of the drawings]

1 and 2 are a schematic front view and a schematic side view showing a machine tool having a grinding function according to one embodiment of the present invention, and FIGS. 3 and 4 are diagrams of FIG. 1 and FIG. FIG. 5 is an enlarged vertical sectional view of a truer and a truer substrate portion, and FIGS. 6 and 7 are provided with a conventional grinding function. FIG. 1 is a partial plan view and a partial front view of a truing device showing a machine tool that has been installed, and the vicinity of the device. 12 ... Table, 13 ... Column, 14 ... Saddle, 15 ...
Shaft head, 16 ... Spindle, 17 ... Grindstone, 19 ... Movable base,
20: rotating shaft, 21: movable table, 22: truing device, 23: touch sensor for automatic measurement, 24: device body of truing device, 25: mounting shaft, 26: truer, 28
…… Electric motor, 32 …… Cylinder mechanism (actuator).

Continuation of front page (56) References JP-A-63-22964 (JP, A) JP-A-48-109573 (JP, U) JP-B-49-13676 (JP, B1) (58) Fields investigated (Int) .Cl. ⁷ , DB name) B24B 53/00 B24B 49/18

Claims (2)

(57) [Claims] 1. A machine tool provided with a grinding function in which a spindle on which a grindstone is mounted is relatively movable in a three-dimensional direction with respect to a table supporting a workpiece. A movable table base fixed to a member relatively moving in a direction perpendicular to the axial direction; a first position attached to the movable table base and located above the table by an actuator and within a movable range of the grindstone. And outside the edge of the table,
A movable table movable between a second position outside the movable range of the whetstone, an apparatus main body mounted on the movable table, a mounting shaft rotatably supported by the apparatus main body, and the mounting A truing device attached to a shaft and having a truer-shaped frusto-conical truer surface that is inclined at an angle of 45 ° with respect to the axis of the mounting shaft; and a movable table in the first position. Means for positioning at a position where the axis of the mounting shaft intersects with the axis of the main shaft at an angle of 45 °, wherein at the first position of the movable base, the truing surface is an outer surface of the grinding wheel and a lower surface. A machine tool with a grinding function characterized by being parallel to the end face. 2. The machine tool having a grinding function according to claim 1, wherein a touch sensor for automatic measurement of a grindstone diameter is provided on the movable table.