JPH03142121A - Method for slotter processing of machining center - Google Patents

Abstract

PURPOSE:To make slotter processing with a stationary tool fitted on a spindle in continuity from preceding milling process using a rotary tool, by revolving the spindle with a slotter tool loaded, indexing the cutter tip to the processing position, clamping it, and then performing slotter processing with Z-axis movement of the spindle head. CONSTITUTION:When an R'ed part is to be processed after boring of a square hole, a stationary tool T for slotter is loaded instead of a rotary tool, and a spindle head 2 is moved in the Z-axis direction, and the tip of the tool T is located. Then a table 26 is moved in the X and Y axis directions and located, and the first corner processed is located under the tool T. At the same time, gear shift is made to the low speed side, and the spindle 6 is revolved at a low speed, which is stopped when the current position as output becomes identical to the program commanded position, and the cutter tip of the tool T is faced to the machining surface as specified. Then the spindle 6 is clamped vigorously with changing-over of a solenoid selector valve 20, and at the same time, interlock is made with the spindle rotation in conformity to a check signal given from a pressure switch 23, and slotter processing is carried out with continuous feed of the spindle head 2 and intermittent feed of a table 26.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a slotter processing method for a machining center.

2. Description of the Related Art Conventionally, square holes in a workpiece as shown in Fig. 1, key grooves as shown in Fig. 2, or grinding gaps as shown in Fig. 3 have been processed using a machining center and then processed using a slotter or saver. It was processed by machine.

Problems to be Solved by the Invention The method of slotter processing using another machine as described in the prior art has the problem that as the number of man-hours increases, there is a lot of wasted time such as moving parts and machining time. There is.

The present invention was made in view of the above problems of the conventional technology, and its purpose is to attach a fixed tool to the main spindle after performing ring machining using a rotary tool, and then use a slotter. It is an object of the present invention to provide a slotter processing method for a machining center that can perform processing.

Means for Solving the Problems In order to achieve the above objects distantly, the slotter processing method for a machining center according to the present invention includes mounting a slotter tool on the main shaft, rotating the main shaft to bring the cutting edge of the tool into a processing position. After indexing, it is clamped and slotter processing is performed by reciprocating the spindle head in the Z-axis direction.

After completing the ξ-ring machining with the rotary tool on the workpiece mounted on the work table, attach the fixed slotter tool to the spindle, rotate the spindle, and move the cutting edge of the tool to the cutting position (angle). ), the spindle is strongly clamped by a hydraulic brake means, and slotter processing is performed by reciprocating the spindle head in the X-axis direction and feeding the table in the X-axis or Y-axis direction.

Example An embodiment will be described with reference to FIG.

In a well-known vertical machining center, a spindle head 2 is movably mounted on a sliding surface in the X-axis direction cut on the front surface of a column 1 fixed on a bed (not shown). is moved and positioned via a ball screw 4 by a motor 3 controlled by an NC device 5 fixed to the column. A spindle 6 is supported by the spindle head 2 so as to be rotatable in the vertical direction.
Two large and small gears 7.8 are fitted onto the gears, and an indexing position detecting sign disc 9 and a brake disc 10 are fitted onto the gears, respectively. A spindle motor], I whose rotation is controlled by an NC device 5 is fixed to the spindle head 2, and a drive gear 13 is fitted to the output shaft 11a of the spindle motor], I. The drive gear 13 is meshed with a gear 15 of an intermediate shaft 14 parallel to the main shaft 6 which is rotatably supported within the main shaft head, and a two-stage gear 16A integral with the spline shaft portion of the intermediate shaft 14 so as to be movable in the axial direction. , 16B are inserted. The two-stage gears 16A and 16B are selectively engaged with the gear 7.8 by a sick mechanism (not shown). A detector 17 is located on the spindle head 2 at a position corresponding to the reference disc 9.
However, hydraulic brakes 18 are fixed at positions corresponding to the brake discs 10, respectively. The hydraulic brake 18 is supplied with pressure oil by a hydraulic circuit, which will be described later, and presses the brake pads on both sides of the brake disc 10 to strongly clamp the main shaft 6. When the supply of pressure oil is cut off, the brake is activated by a built-in spring. The pad opens to release the clamp.

In the main shaft clamp hydraulic circuit, the source pressure P is communicated with the boat a of the electromagnetic switching valve 20 through a conduit 19, and the boat b is communicated with the tank T through a return conduit 21. Further, the boat c is connected to the hydraulic brake 18 through a pipe line 22, and a pressure switch 23 for outputting a confirmation signal is installed in the middle of the pipe line 22.

On the other hand, a carriage (not shown) is movably mounted on a sliding surface in the Y-axis direction cut on the head, and the carriage is connected to the NC device 5.
A ball screw 25 is driven by a motor 24 whose rotation is controlled by
It is moved and positioned through. X cut on the carriage
A table 26 is movably mounted on a sliding surface in the axial direction, and the table 26 is moved and positioned via a ball screw 28 by an NC device-controlled motor 27 fixed to the carriage, and a workpiece is placed on the table 26. Object W is attached.

The NG device 5 is provided with a servo system for rotation and rotation indexing of the main shaft in addition to servo systems for the X, Y, and Z axes. Speed control section 30 of this spindle servo system
The position controller 31 compares the specified rotation speed of the program with the current speed from the detector 12 and outputs a signal that makes the speed equal to the specified rotation speed. The main shaft power amplifying section 32 is a part that outputs a signal to obtain a specified angle by comparing the current position (angle) of the main shaft with the current position (angle) of the main shaft. This is a part that supplies power to the main shaft motor 11 to rotate the main shaft to a specified angle based on a signal from the position control section 31.

Next, the operation of this embodiment will be explained.

Now, for the workpiece W mounted on the table 26,
The machining of the square holes with the rotary tool has been completed, and the four corners are now rounded.
Now we are about to start cutting the corners. The spindle head 2 is moved to the upper end position in the X-axis direction, a tool is exchanged by an automatic tool changer (not shown), and a slotter fixed tool T is attached to the spindle in place of the rotary tool. Next, the spindle head 2 is moved downward in the X-axis direction, the tip of the tool T is positioned slightly above the workpiece W, and the table 26 is moved downward in the X-axis direction.
The tool is moved and positioned in the axial and Y-axis directions, and the corner to be machined first, for example, the right-hand front corner in the figure, is positioned at a lower corresponding position under the tool. At the same time, two-stage gear 16A, 16
B is shifted, gears 7 and 16A are engaged, and the speed is changed to the low speed side, and power for spindle turning is supplied from the spindle power amplifying section 32 of the NC device 5 to the spindle morph 11, and the spindle 6 turns at a low speed. Then, the rotation of the main shaft 6 rotates the sign disk 9, and the current position W (angle) is detected from the detector 17 by the position controller 3.
This current position is compared with the program command position outputted to 1 and stored in the position control unit, and when they match, the rotation of the spindle is stopped and the cutting edge of the fixed tool T faces a predetermined cutting surface. Next, the solenoid S OL 1 of the electromagnetic switching valve 20 is energized and switched to the I position, pressure oil is supplied to the electromagnetic brake I 8 through the pipe 22, and the brake disc 10 is pressed from both sides with brake butts, so that the main shaft 6 is activated. Clamped strongly. At the same time, a confirmation signal is output from the pressure gas isolator 23, and an interlock is performed on the rotation of the main shaft within the NC. Next, the cutting feed and rapid feed speed of the spindle head 2 (0, 1
Continuous vertical feed in the Z-axis direction at ~15 m/min),
Slotter processing is performed by intermittent cutting feed of the table 26 in the X-axis or Y-axis directions.

Note that the feed of the table 26 is not limited to the cutting feed, but can also be combined with a relief feed to avoid contact between the cutting surface and the cutting edge when the tool T is pulled up.

Effects of the Invention Since the present invention is configured as described above, it produces the following effects.

The spindle can be rotated and indexed at any angle, the spindle is strongly clamped by a fluid pressure brake, and slotter processing is performed by reciprocating the spindle head in the Z-axis direction, making it possible to mill with a rotating tool on a machining center. , it is possible to realize continuous machining from drilling etc. to slotter machining using a fixed tool, reducing man-hours and improving machining accuracy.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the slotter mechanism of the machining center of this embodiment, including a partial hydraulic circuit diagram and block diagram, Fig. 2 is a perspective view of a workpiece having a keyway cited in the prior art, and Fig. 3 1 is a perspective view of a workpiece having grinding slits cited in the prior art. 2 ・・Spindle head 6・・Spindle 10・・Brake disc 1st・・Hydraulic brake

Claims (1)

[Claims] (1) In a machining method for a machining center having a main shaft (6) that can be rotated, indexed and clamped at any angle,
The slotter tool (T) is attached to the spindle, the spindle is rotated to index the cutting edge of the tool to the processing position, and then clamped, and the spindle head (2) is reciprocated in the Z-axis direction to perform slotter processing. A slotter processing method for a machining center characterized by: