JPH0340524Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a control device for a processing device in which the movement of a plurality of processing heads and the rotation of a main shaft are controlled by a programmable sequence controller.

<Conventional technology> Conventionally, in processing equipment that uses a sequence controller to control the advance and retreat of multiple processing heads, the rotation of the main shaft, etc., in order to temporarily stop the operation of the processing equipment when replacing the cutting tool, a When the stop button is pressed, a stop command is given from the sequence controller to the drive circuit to stop the rotation of the feed motor and spindle motor, thereby stopping the forward and backward movement of the machining head and the rotational movement of the spindle.

<Problems that the invention aims to solve> However, with the above-mentioned device, it is not possible to stop individual processing devices using signals from the sequence controller, so it is necessary to stop processing devices that do not require cutting tools. There is a problem of lowering the operating rate.

<Means for Solving the Problems> The present invention was made to solve the above-mentioned problems, and a cutter change preparation switch and a cutter change stop switch are provided on the operation panel, and the feed motor of the machining head, etc. A cutoff relay for cutting off power supply to the controlled element is provided, and a start inhibiting means for prohibiting the restart of the machining head at the operating end of the machining head in response to the operation of the cutter exchange preparation switch; A cutoff circuit is provided separately from the programmable sequence controller to turn the cutoff relay into a cutoff state in response to the operation.

<Function> When the cutter change preparation switch is pressed, the machining head is stopped at the operating end according to the program stored in the programmable sequence controller and restart is prohibited, and when the cutter change stop switch is then pressed, the feed motor is stopped. The power supply to controlled elements such as the following is cut off.

<Examples> Examples of the present invention will be described below based on the drawings.

Figure 1 shows one of a plurality of processing devices in which the rotation of the spindle and the forward and backward movements of the processing head are controlled by a programmable sequence controller.
1 is a bed of a processing device, and a processing head 2 is mounted on the bed 1 so as to be movable forward and backward. A main shaft motor 4 for rotating a main shaft 3 to which a cutting tool T is attached is installed in the processing head 2. Further, a feed motor 5 is installed in the bed 1, and a feed screw 6 is connected to the output shaft of this feed motor 5.
A feed nut 7 fixed to the processing head 2 is screwed into the feed nut 7. The output shaft of the feed motor 5 is designed to detect absolute position.

The power line 9 of the spindle motor 4 and feed motor 5 is connected to a power supply line 9 that controls the rotation of the spindle motor 4 and feed motor 5 by base current control of a switching register.
Drive circuits 10 and 11 for ON/OFF control are provided. The drive circuits 10 and 11 are connected to a programmable sequence controller 17 via an input/output interface 16. An operation panel 19 disposed adjacent to the processing head 2 is connected to the programmable sequence controller 17 via an input/output interface 18.

It should be noted that a plurality of machining devices, each of which includes a machining unit and an operation panel 19, are connected to this programmable sequence controller.

As shown in FIG. 2, the operation panel 19 includes a cutter exchange preparation switch 20, a cutter exchange stop switch 21, an operation restart preparation switch 22, an operation switch 23, a cutter exchange lamp 24, and a cutter exchange stop lamp 25. . A cutter exchange preparation switch 20, an operation switch 23, and a cutter exchange stop switch 2
1 and the operation restart preparation switch 22 are mechanically interlocked with each other. Note that the cutter change preparation switch 20 and the cutter change stop switch 21 do not have contact points, the cutter change preparation switch 20 is a switch that releases the pressed state of the operation switch 23, and the cutter change stop switch 21 is a switch that prepares for restarting operation. 22 is used as a switch to release the pressed state.

A cutoff circuit 27 is connected to the operation restart preparation switch 22, and this cutoff circuit 27 includes power cutoff relay contacts 27a and 27b inserted between the power supply line 9 and the drive circuits 10 and 11, respectively, and the relay contacts. It is composed of a cutoff coil 27c connected to the input/output interface 16 to control opening and closing.

Next, the operation of the above-described configuration will be explained based on the flowchart of FIG. 3.

When machining is started based on the machining command, the machining device starts machining according to the machining cycle 100. This machining cycle 100 consists of the following steps. In step 101, the spindle 3 is rotated by the spindle motor 4, and in step 102, the machining head 2 is rapidly forwarded to the forward forward position by the feed motor 5, and then, in step 103, the machining head 2 is moved by the cutting feed by the command amount. Move it forward and process the workpiece with the cutting tool T.

When the machining is completed, the machining head 2 is moved back to the retreat end in step 104, and the rotation of the spindle motor 4 is stopped in step 105.

After that, in step 106, the operation switch 2 is turned on.
3 is in the open state, and if it is not in the open state, the above-described machining cycle 100 is repeated to continue the machining. However, when the operator presses the cutter exchange preparation switch 20 during or after the machining cycle 100 in response to a cutter exchange instruction, the operation switch 23 is released from the pressed state and becomes open, and the machining cycle 100 ends. The start-up is stopped with the machining head 2 positioned at the backward end, and then the process proceeds to step 107.

When the process advances to step 107, the cutter change stop permission lamp 25 is turned on to inform the operator that the machining head 2 is at the backward end and restarting is prohibited for the purpose of changing the cutter, and the process proceeds to step 108. In step 108, it is determined whether the cutter exchange stop switch 21 is pressed by the operator and the operation restart preparation switch 22 is released from the pressed state and is in the open state.
If it is not in the open state, it stops in the state of step 108 and waits for the operation restart preparation switch 22 to be released. When the operation restart preparation switch 22 is in the open state, the process proceeds to step 109 and the cutter replacement lamp 24 is turned on to notify the operator that the cutter can be replaced.

While the programmable sequence controller 17 is performing the above processing, the cutter exchange stop switch 21 is pressed and the operation restart preparation switch 2 is pressed.
2 is released, the cutoff coil 27c is deenergized, and the power cutoff relay contact 27a, the contact 27
b becomes open. As a result, the main shaft motor 4 and the feed motor 5 are powered off, and motor activation is unconditionally prohibited regardless of the sequence controller.

Therefore, only for processing equipment that requires cutting tools to be replaced without stopping the operation of the programmable sequence controller 17 of the entire equipment, the output of the programmable sequence controller 17 is reduced, and the power to the spindle 3 and machining head 2 is cut off. or the movement of the processing head 2 can be stopped.

In addition, when restarting operation after replacing the cutting tool,
The operator presses the operation restart preparation switch 22 and the operation switch 23 in sequence. As a result, the cutoff circuit 2
The coil 27c in 7 is energized, and the relay contact 2
7a and 27b are closed, and the drive circuits 10 and 11 are in a state in which they operate according to commands from the sequence controller 17. At the same time, the sequence controller 17
A command is given to the drive circuits 10 and 11 by the program in the machine, whereby the spindle motor 4 starts rotating, and the feed motor 5 is started in a predetermined sequence to move the machining head 2 forward and backward.

<Effects of the invention> As described above, the present invention provides a cutter change preparation switch and a cutter change stop switch on the operation panel in equipment with multiple processing heads, and responds to the operation of the cutter change preparation switch. By configuring the machining head so that it does not restart, and then providing a cutoff circuit separate from the programmable sequence controller that cuts off the power supply to the controlled elements in response to the operation of the cutter change stop switch, the entire equipment can be For processing equipment that requires cutting tools to be replaced without stopping the operation of the programmable sequence controller, the output of the programmable sequence controller can be reduced and the power to the spindle and processing head can be cut off to stop the movement of the spindle and processing head. Tools can be replaced without reducing efficiency.

[Brief explanation of the drawing]

Fig. 1 shows an embodiment of the control device in the processing equipment according to the present invention, Fig. 2 shows the operation panel of the processing equipment shown in Fig. 1, and Fig. 3 shows a flowchart showing the processing of the programmable sequence controller in the processing equipment shown in Fig. 1. It's a chat. 1... Bed, 2... Processing head, 4... Spindle motor, 5... Feed motor, 10, 11... Drive circuit, 1
7...Programmable sequence controller, 1
9...Operation panel, 20...Blade replacement preparation switch, 21
... cutter exchange stop switch, 22 ... operation restart preparation switch, 23 ... operation switch, 27 ... cutoff circuit.

Claims (1)

[Scope of utility model registration request] In a processing device in which the advance and retreat of multiple processing heads and the rotation of the main shaft are controlled by a programmable sequence controller, a cutter change preparation switch and a cutter change stop switch are provided on the operation panel, and a cutter change preparation switch and a cutter change stop switch are provided on the operation panel. a cutoff relay for cutting off the power supply to controlled elements such as the cutter, etc., and a start inhibiting means for prohibiting the restart of the processing head at the operating end of the processing head in response to the operation of the cutter replacement preparation switch; A control device for a processing device, characterized in that a cutoff circuit is provided separately from the programmable sequence controller to turn the cutoff relay into a cutoff state in response to operation of a stop switch.