JPH0323294B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an interference checking method for a numerically controlled (hereinafter abbreviated as NC) lathe.

The NC lathe's interference check method controls the position of the tool relative to the workpiece using the corresponding numerical information, and when machining the workpiece, it uses the position information of the tool to control other chucks and tailstocks. are now being controlled without interference. However, lathes that can process complex shapes easily and with high precision, further improving productivity.
Particularly for lathes with multiple tool rests, checking for interference has been a problem because the tool rests (hereinafter referred to as turrets) move individually.

FIG. 1 is a diagram showing a schematic configuration of a lathe with multiple tool rests. In FIG. 1, a cylindrical workpiece 2 is positioned and fixed on a chuck 1 that rotates about a rotation axis (Z-axis), and one end of the workpiece 2 is supported by the tip 3a of a tail stock 3. . Also, the first turret 4 and the second turret 5
Tools 6 and 7 for cutting the workpiece 2 are fixed to each of them. When cutting the workpiece 2, the first and second turrets 4 and 5 are aligned with the arrow Z.
If the workpiece 2 is moved in this direction, the workpiece 2 will be cut by the tools 6 and 7.

Next, an outline of a conventional interference check will be explained with reference to FIG. FIG. 2 shows a block diagram of an interference check of the first turret 4 and the second turret 5 shown in FIG. In this figure, 10 is the first
A first turret movement data register that holds movement data of the first turret 4 shown in the figure; 11 a second turret movement data register that also holds movement data of the second turret 5; and 12 a second turret movement data register that also holds movement data of the second turret 5. This is an interference check discriminator that determines the magnitude of the movement data of the second turret 4 and the movement data of the second turret 5 to determine whether or not they interfere.

Next, the operation will be explained. 1st turret 4
When the turret 5 is moved, its movement data is entered into the first turret movement data register 10, and when the second turret 5 is moved, its movement data is input into the second turret movement data register 11. The interference check discriminator 12 determines the magnitude of the movement data in the first turret movement data register 10 and the second turret movement data register 11, constantly judges whether or not there is interference, and issues an alarm if it is judged that there is interference. Outputs a signal and stops further operations.
Note that the interference determination by this interference check discriminator 12 is as follows:
Since the magnitude of movement data is constantly judged, the operation of the turret is stopped just before interference occurs.
If it is determined that there is no interference, the operation continues.

The interference check of conventional NC lathes is carried out as described above, so even if interference between the turrets 4 and 5 is detected, it will simply be mechanically stopped and each turret 4 and 5 will be stopped for subsequent restarts. There was a problem in that after returning No. 5 to the origin and correcting the machining program, it was necessary to start over from the beginning.

This invention was made in order to eliminate the drawbacks of the conventional machines as described above. Even if interference occurs between each turret, the machine is stopped, each turret is returned to its origin, and the machining program is restarted. The object of the present invention is to provide an interference check method for a numerically controlled lathe that does not require the interference check to be restarted from the beginning after correction.

Hereinafter, one embodiment of the present invention will be described based on FIGS. 3 to 5.

In FIG. 3, 10, 11, and 12 are the same as in FIG. The standby switch 14 is also a second standby switch 1 that stops the movement of the second turret 5 in order to stop the interference of the second turret 5.
5 is a flip-flop which is set by the first standby switch 13 to block the movement data of the first turret movement data register 10; 16 is a flip-flop which is set by the second standby switch 14 to block the movement data of the first turret movement data register 10; register 1
This is a flip-flop for blocking one movement data. 17 is the flip-flop 15
AND gate 1 which ANDs the standby signal 19 from the first turret movement data register 10;
8 is a standby signal 2 from the flip-flop 16;
This is an AND gate that performs AND between 0 and the second turret movement data register 11. Further, 21 is a first turret standby release signal that is generated every time one movement unit (hereinafter referred to as 1 block) of the movement of the second turret 5 is completed, and 22 is the first turret standby release signal.
This is the second turret standby release signal that is generated every time one block of the turret 4 is completed.

Next, the operation will be explained.

First, when the first turret 4 is moved, movement data is entered into the first turret movement data register 10, and when the first standby switch 13 is not pressed, the flip-flop 15 is in the reset state, so the standby signal 19 is input. becomes “1” and passes through the AND gate 17 as it is to the interference check discriminator 1.
2, but since the second turret 5 is not moving at this time, no interference occurs.

Next, as the second turret 5 also moves, movement data is entered into the second turret movement data register 11, and the first turret 4 and second turret 5 move simultaneously, making it possible for the operator to visually check that they are likely to interfere. I will explain what happens when it is determined that the child has become sick.

Note that such a case is, for example, the case shown in Fig. 4, and specifically, while the first turret 4 that has finished boring is moving to the right side of the figure (arrow A), the end face processing is performed. This is a case where the second turret 5 with the tool for cutting starts moving in the direction of arrow B and is about to interfere at point C.

At this time, the operator visually determines that it is better to stop the second turret 5, and turns on the second standby switch 1 of the second turret 5.
Press 4. As a result, flip-flop 16 is set. When the flip-flop 16 is set, the standby signal 20 becomes "0", the output of the AND gate 18 becomes "0", and the movement data from the second turret movement data register 11 is blocked, so that the second turret 5 stops at the solid line position, and only the movement data of the first turret 4 is input to the interference check discriminator 12. Therefore, the interference check discriminator 12 does not work, and the first turret 4
only can be moved.

Then, the first turret 4 continues to move, and when the movement of the first turret 4 is completed (the dotted line position in FIG. 4) and the first turret movement data register 10 becomes "0", the first turret 4 is moved. A second turret standby release signal 22 is generated. When this second turret standby release signal 22 is output, the flip-flop 16 blocking the movement of the second turret 5 is reset, so that the standby signal 20 becomes "1".
When the AND gate 18 is turned on, the data in the second turret movement data register 11 is output. In this case, the first turret 4
Since the movement of has been completed (dotted line position in Figure 4),
Even if the second turret 5 moves to the dotted line position, the first
The turret 4 can be moved without interference with the turret 4.

Next, a case will be described in which the movement of the first turret 4 is stopped while the first turret 4 and the second turret 5 are moving.

Incidentally, such a case is, for example, a case as shown in FIG. This is a case where the second turret 5, which performs the boring process and is moving in the direction, is about to interfere.

At this time, if the operator visually determines that the first turret 4 and the second turret 5 are about to interfere, when the operator presses the first standby switch 13, the flip-flop 15 is set. When the flip-flop 15 is set, the standby signal 19 becomes "0" and the AND gate 1
7, the movement data from the first turret movement data register 10 is no longer output to the interference check discriminator 12. As a result, the first turret 4 stops at the solid line position in FIG. Even when the first turret 4 is stopped, the second turret 4
The turret 5 continues to move as movement data is continuously outputted from the second turret movement data register 11. When the second turret movement data register 11 becomes "0" and the second turret 5 stops at a position away from the first turret 4 (dotted line position in Figure 5), the second turret movement data register 11 becomes "0". A first turret standby release signal 21 is generated. This first turret standby release signal 21
By resetting the flip-flop 15 that blocks the movement data of the first turret 4, the standby signal 19 becomes "1", and by opening the AND gate 17, the movement data from the first turret movement data register 10 is blocked. The data passes through the interference check discriminator 12 and moves the first turret 4 to the dotted line position.

Note that the interference check discriminator 12 is similar to the conventional one, so if interference occurs between the first and second turrets 4 and 5, the first turret 4 or the second turret may It operates when turret 5 is not stopped.
When this interference check discriminator 12 works,
As in the past, it is necessary to return each turret 4, 5 to its origin.

As explained above, according to the present invention, when interference occurs between turrets, there is no need to stop the machine, return each turret to its origin, correct the machining program, and then start over again from the beginning. It becomes possible to move the turret.

In addition, if the time at which each turret was stopped is stored in memory and this stopped time is reflected in the created machining program, from the second machining onwards, machining can be performed continuously without considering interference between each turret. It becomes possible to perform processing.

In the above embodiment, even if one turret is stopped, if there is interference between the turrets due to the movement of the other turret, there is a fundamental mistake in creating the machining program, so in this case, , it is necessary to recreate the machining program.

Further, in the above embodiment, the first and second standby switches 13 and 14 are provided to generate the standby signals 19 and 20, but the first and second standby switches 13 and 1
4 may be omitted and an external standby signal may be used.

Further, in the above embodiment, the interference check for two tool rests has been explained, but mutual interference can be prevented by similar means even in the case of three or more tool rests.

As explained above, this invention prevents mutual interference between numerically controlled lathes having a plurality of tool turrets by using standby signals, and is configured to automatically restart when the interference state is removed. When interference occurs, there is no need to stop the machine, return each turret to its origin, correct the machining program, and then repeat the interference check from the beginning, making it possible to perform the interference check with improved workability.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the outline of a lathe with multiple tool rests, Fig. 2 is a block diagram showing a conventional interference check, Fig. 3 is a block diagram showing an embodiment of the present invention, Figs. The figure is a diagram for explaining an example in which turrets interfere with each other. In the figure, 4 is the first turret, 6 is the tool, 10 is the first turret movement data register, and 11 is the second turret.
12 is an interference check discriminator, 13 is a first standby switch, 14 is a second standby switch, 15 and 16 are flip-flops, 17 and 18 are AND gates, 19 and 20 are standby signals, 21 is the first turret standby release signal,
22 is a second turret standby release signal. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A method for checking interference between the turrets in a numerically controlled lathe equipped with a plurality of turrets that move simultaneously, including a stopping means for independently temporarily stopping the movement of each turret, and a stop means for stopping the movement of each turret independently. A release means is provided for canceling the temporary stop of the temporarily stopped tool post based on the completion signal after the machining of the dead tool post is completed, and the stopping means prevents interference between the respective tool posts. A predetermined tool rest is temporarily stopped before this occurs, and after the processing of the tool rest that was not stopped by the above-mentioned stopping means is completed,
An interference checking method for a numerically controlled lathe, characterized in that the temporary stop of a tool post which has been temporarily stopped by the above-mentioned release means is released.