JPH0433583B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is applicable to grinding in which the feed control of a grinding tool of a grinding wheel correction device, the feeding control of a table, or the feeding control of a grinding head cannot be performed simultaneously. It's about the board.

<Prior art> A dedicated grinding machine that can repeatedly perform the same machining in a short period of time is made to be inexpensive by controlling the feed control of the grinding tool of the grinding device and the feed control of the table, or by controlling the feed of the grinding table. There is one that uses a simple and inexpensive numerical control device (hereinafter referred to as an NC device) that cannot simultaneously control the feed of the machine.

In this case, since it is not possible to control other NC axes while the grinding wheel is being corrected, the grinding wheel correction tool is moved to the position shown in Figure 1 while the grinding of several workpieces is completed and a new workpiece is being installed. M as shown
Starting from this point, the grinding wheel is corrected along the route shown by the arrow and returned to point M.
In this case, the operation of moving from point M to point N when correcting the grinding wheel becomes a waiting time, so there is a problem that the time required for correcting the grinding wheel becomes longer. It was hot.

<Object of the invention> In order to solve the above-mentioned problems, the object of the present invention is to shorten the waiting time for grinding wheel correction and to shorten the time required for grinding wheel correction. .

<Structure of the Invention> A grinding machine equipped with a grinding wheel correction device according to the present invention utilizes the operation time for mounting and removing a workpiece, and performs a grinding operation by using a grinding tool of the grinding device for each operation. The present invention is characterized in that the numerical control device is equipped with a control function for moving the grinding wheel in divisions by a predetermined amount in the direction of the rotational axis of the grinding wheel toward the starting point.

<Examples> Examples of the present invention will be described below based on the drawings. In FIG. 2, reference numeral 11 denotes a table, and this table 11 is slidably guided along guide surfaces 15 and 16 formed in front of the bed 10. A feed screw 18, which is rotated by the screw, is screwed together.
A headstock 12 and a tailstock 13 that support the workpiece W in the sliding direction of the table 11 are placed on the table 11 . A main shaft 14 is pivotally supported on the headstock 12, and the main shaft 14 is used to transmit rotation to the workpiece W.
A spindle drive motor for rotating the spindle is built into the spindle stock 12. A center 19 is pivotally supported on the tailstock 13, and a center cylinder device for moving the center 19 forward and backward is built in the tailstock 13.

On the other hand, behind the bed 10, a grinding wheel stand 20 is slidably guided by guide surfaces 21 and 22 in a direction oblique to the sliding direction of the table 11, and this grinding wheel stand 20 is equipped with a servo motor. A feed screw 25 rotated by a screw 23 is screwed together. An angular-shaped grinding wheel G is mounted on a shaft on the front side of the grinding wheel head 20, and this grinding wheel G is rotationally driven by an unillustrated grinding wheel drive motor provided on the grinding wheel head 20. It's becoming like that.

On the other hand, as shown in FIG.
is installed. The traverse table 32 of this grinding wheel correction device 30 is movably guided in a direction parallel to the axis of the grinding wheel G.
A screw shaft 34 rotated by a servo motor 31 is screwed onto the top. The traverse table 32
The template 33 is inserted into the template 33 by the cylinder device 50.
A reciprocating table 35 is guided which is pressed against the template 33 and moves back and forth in a direction orthogonal to the axis of the grinding wheel G, and a slewing head 36 on which a grinding wheel correction tool T is mounted is attached to the tip of this retracting table 35. The wheel repair tool motor 39 rotates the wheel repair tool T to the truing head 3.
It is attached to 6. The advancing/retracting table 35 has a feed screw 38 which is screwed into a ram portion 37 integrated with the truing head 36 and rotated by a servo motor 38.
A is provided.

The work W is carried in and out between the headstock 12 and the tailstock 13 by a workpiece carry-in/out device (not shown) which is a known means.

In FIG. 4, the above-mentioned workpiece loading/unloading device 40, grinding wheel drive motor 41, center cylinder device 42, main shaft driving motor 45, and grinding wheel correction tool motor 39 are connected to a sequence control device 43, and this sequence control device 43 and NC device 44
Servo motors 17, 23, 31, and 38 are connected via. The NC device 44 is the table 1
1 or the feed control of the grinding head 20 and the feed control of the traverse table 32 cannot be performed simultaneously, that is, it does not have a two-axis control function, and the sequence control is performed after machining of the workpiece W is completed. When the Wo movement command is issued from the device 43 to the NC device, the workpiece is mounted and removed in the direction of the rotational axis of the grinding wheel G by moving the grinding wheel correction tool T towards the starting point B of the grinding wheel correction operation shown in Fig. 5. Equipped with a control function that allows the workpiece to be moved by a predetermined amount each time the workpiece is attached or removed. This grindstone correction tool T is moved by a predetermined amount at a time Wo
is determined by dividing the amount of movement W from the end point A of the wheel correction operation to the start point B of the wheel correction operation shown in FIG. It is entered in advance by the worker.

The above-mentioned configuration and FIGS. 6, 7, 8, and 9
The grinding wheel correction operation will be explained based on FIGS. The sequence control device 43 operates the workpiece loading/unloading device 40 to load a new workpiece W between the headstock 12 and the tailstock 13, and activates the center cylinder device 42 to move the center 19 forward. Installation takes place.
Next, the NC device 44 operates the servo motor 17 to move the table 11 to a position where the grinding wheel G and the processing location of the workpiece W correspond. In this state, the sequence control device 43 operates the spindle drive motor 45 to rotate the workpiece W, and also operates the grinding wheel drive motor 41 to rotate the grinding wheel G, and the NC device 44 operates the servo motor 23.
The workpiece W is processed by operating the grinding wheel head 20 to move it forward. After machining the workpiece W, the rotation of the main shaft 14 is stopped, the center cylinder device 42 is operated to move the center 19 backward, and the workpiece loading/unloading device 40 is operated to carry out the machined workpiece W. W is removed. Thereafter, several workpieces W are processed by repeating the above-described operations.

Every time machining of the workpiece W is completed, a Wo movement command is sent from the sequence control device 43 to the NC device 44, and as soon as the removal operation of the workpiece W starts, the NC
The servo motor 31 is operated by the device 44, and the traverse table 32 is moved in sections from the grinding wheel correction operation end point A to the grinding wheel correction operation starting point B. The amount by which this traverse table 32 is divided into parts is determined by the amount W by which the grinding wheel correction tool T is moved from the finishing point A of the grinding wheel correction operation to the starting point B of the grinding wheel correction operation, as shown in FIG. 5, by the NC device 44. Processing number No.
This divided movement is completed within the time required to remove and attach the workpiece.

At the time when several workpieces W have been machined, the grinding wheel correction tool T is at the grinding wheel correction operation starting point B due to the aforementioned divisional movement of the grinding wheel correction tool T, and in this state, the grinding wheel drive motor 41 is controlled by the sequence control device 43.
is operated to rotate the grinding wheel G, and at the same time, the grinding wheel correction tool motor 39 is operated to rotate the grinding wheel correction tool T. In this state, the cylinder device 50 advances the grinding wheel correction tool T together with the advance/retreat table 35 from point B to point C until the stylus of the advance/retreat shaft 35 is pressed against the template 33, and then the truing head is moved by the operation of the servo motor 38. 3
6 is advanced by the amount of correction. Next, the traverse table 32 is moved to the left by the operation of the servo motor 31. As the traverse table 32 moves to the left, the advance/retreat table 35 moves backward and forward following the template 33, and the grinding wheel G is corrected by the grinding wheel correction tool T. When the grinding wheel correction tool T is moved to point D as shown in FIG. The grinding wheel correction tool T is returned to the grinding wheel correction operation end point A, and the rotation of the grinding wheel correction tool T is stopped. After this, machining of a new workpiece W is performed again.

<Effects of the Invention> As described above, the present invention uses a numerical control device to move the grinding wheel correction tool in the direction of the rotational axis of the grinding wheel toward the start point of the grinding wheel correction operation in parallel with the operations such as mounting and removing the workpiece. Since the workpiece is moved in parts for each workpiece attachment and removal operation, it is possible to shorten the grinding time during machining of the next new workpiece after machining several workpieces.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the operating locus of a conventional grinding wheel correction tool, Figs. 2 to 10 show embodiments of the present invention, and Fig. 2 is a plan view of a grinding machine according to the present invention. Fig. 3 is a diagram showing the grinding wheel correction device, Fig. 4 is a control circuit diagram, Fig. 5 is a drawing showing the operating locus of the grinding wheel correction tool of the present invention, and Fig. 6 is a diagram showing the operating sequence of the grinding machine. Figure 7 is a flowchart of sequence control, Figure 8 is a flowchart of workpiece machining by NC control, Figure 9 is a flowchart of traverse table division movement by NC control, and Figure 10 is NC. Flowchart of wheel correction by control. 10... bed, 11... table, 12...
Headstock, 13...Tailstock, 17, 23, 31, 3
8...Servo motor, 20...Wheelhead, 30...
...Wheel correction device, 32...Traverse table, 33
...Template, 35... Advance/retreat table, 36... Truing head, 37... Ram section, 39... Grinding wheel correction tool motor, 40... Work loading/unloading device, 41... Grinding wheel drive motor, 42... ... Cylinder device for center, 43 ... Sequence control device, 44 ... NC control device, 45 ... Main shaft drive motor, 50 ... Cylinder device, G ... Grinding wheel,
T...Wheel correction tool, W...Work.

Claims (1)

[Claims] 1. Equipped with a wheel correction device that performs wheel correction every time several workpieces are processed, and simultaneously controls the feed of the wheel correction tool of the grinder correction device and the feed control of the table or the feed of the wheel head. In grinding machines equipped with numerical control devices that cannot
In response to signals from the sequence control device, the numerical control device directs the grinding wheel correction tool toward the correction operation starting point for each operation in parallel with operations such as mounting and removing the workpiece, and rotates the grinding wheel. What is claimed is: 1. A grinding machine equipped with a wheel correction device, characterized in that it is equipped with a control function to move the wheel by a predetermined amount in an axial direction.