JPH01109052A - Numeric controller - Google Patents

Abstract

PURPOSE:To enable restart in a short time by providing an operating condition memory means, a motion control means, a stop position memory means and a start control means. CONSTITUTION:Upon provision of an emergency return command, an operating command cycle of a machine at that time is stored in an operating condition memory means and the machine is moved to a predetermined stopping position, then the stopping position data is stored in a stop position memory means. When the machine is started again, the machine is started from the stopping position stored in the stop position memory means and from the operating condition stored in the operating condition memory means. Consequently, the machine can be started again easily in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a numerical control device that makes it possible to easily and quickly restart a machine tool after it has been brought to an emergency return.

<Prior Art> Conventional numerical control devices of this type, for example, numerical control devices for grinding machines, are equipped with an emergency return button or an emergency stop button, and when an abnormality occurs during grinding, the emergency return button or emergency stop button is pressed. The machining cycle is interrupted by pressing the stop button.

<Problems to be Solved by the Invention> However, in such conventional numerical control devices, especially those that control machine tools using an incremental method, once a cycle is interrupted, all information such as the operating cycle or position data at that time is lost. If you try to restart the machine after adjusting it, you will have to return each control axis to its original position before restarting the machine. There were problems such as it taking a long time to restart.

<Means for Solving the Problems> The configuration of the present invention for solving the above problems consists of a series of operation commands that are output to the machine when an emergency return command is output, as conceptually shown in FIG. Among them, an operation state storage means for storing the block number of the operation in which the machine is currently being operated, a movement control means for moving the machine to a predetermined stop position and stopping it when an emergency return command is output, and the position of this stop position. stop position storage means for storing data; and startup control means for restarting the operation starting from the stop position stored in the stop position storage means and from the operation state stored in the operation state storage means. It is characterized by having the following.

<Operation> In the above configuration, at the same time when the emergency return command is output, the operating cycle command of the machine at that time is stored in the operating state storage means, and the machine is moved to a predetermined stop position, and the position data of this stop position is stored in the stop position memory. stored in the means.

After that, when restarting the machine, the machine is restarted easily and in a short time by starting the operation from the stop position stored in the stop position storage means and from the operation state stored in the operation state storage means. Can be done.

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

In Fig. 2, 10 is an angular slide type grinding machine;
20 is a numerical control device that controls this grinding machine in an incremental manner. The grinding machine IO has a grindstone stand 11 that supports a grinding wheel G, and a workpiece table 1 on which a workpiece W is placed.
3.

The grindstone head 11 and the workpiece table 13 are moved by servo motors 12.14, which are each rotated by a drive circuit 16.17. Rotary encoder 1 is attached to servo motors 12 and 14.
6.17 is connected. Further, the output signals of the rotary encoders 16 and 17 are input to the CPU 21 via an interface 29.

In addition, 15 is an end face sizing device for positioning the workpiece W in the axial direction, and 19 is a machining diameter sizing device that measures the machining diameter of the workpiece W and outputs a sizing signal when it is ground to a predetermined dimension. , the forward and backward movement is performed by inputting a control signal from the CPU 21 to the hydraulic circuit 18, and the end face sizing signal and machining diameter sizing signal are sent to the CP via the interface 28.
It is input to U21.

The numerical control device 20 includes a CPU 21, a RAM 24, an R
OM25, pulse generator 23, interface 26.
27.28.29, pulse generator 23
Command pulses sent from the drive circuits 16 and 17 are supplied to the drive circuits 16 and 17.

Note that the RAM 24 is backed up by a battery so that its stored contents will not be erased even in the event of a power outage.

A display control circuit 37 is connected to the interface 26, and a CR7 display device 38 is connected to the display control circuit 37. Further, a bubble cassette input/output device 34 storing NC data and an operation panel 36 are connected to the interface 27. On this operation panel 36 are a data write key for setting other data in a predetermined area of the RAM 24, a start push button for starting the machining cycle, and an emergency return button for the grindstone head 11 and workpiece table 13 in the event of an abnormality in the machining cycle. An emergency return button is provided.

On the other hand, the RAM 24 is formed with a data area for storing a machining cycle control program consisting of a large number of blocks that instruct the operation of the grinding machine 10. In addition, this RAM 24 includes an operating state storage memory 241 that stores the block number when the emergency return is performed, and a stop position storage memory 242 that stores the position data of the workpiece table 13 when the workpiece table 13 stops after the emergency return. It is formed.

The RAM 24 further has a storage area for an emergency return cycle program. This emergency return cycle program is such that when the emergency return button is pressed due to an abnormality in the machining cycle while each feed axis of the grinding i10 is being controlled according to the NC data, the CPU 21 uses the signal as an interrupt signal to initiate the emergency return cycle. Execute processing.

Note that the NC data consists of a plurality of blocks as shown in FIG.
Each block is assigned a block number such as LOOI...L00n so that it can be distinguished.

Next, the processing operations of the numerical control device 20 of the present invention will be explained using the flowcharts of FIGS. 5 to 9, taking as an example the case of grinding a workpiece shown in FIG. First, in the stopped state, the grinding wheel G is located at the original position PO. When the start button on the operation panel 36 is then pressed, the CPU 21 starts processing.

This process is as shown in Fig. 5: i) Step of positioning the end face ii) Step of zeroing the contents of the index counter IC iii) Step of advancing the machining diameter sizing device iv)
Step of performing plunge cut grinding V)) Performing rubber grinding vi) Determining the contents of the indexing force rank IC Step vi) Retracting the machining diameter sizing device and grinding wheel Step vii) Performing table indexing Step ix) Steps to advance the content of the index counter IC can be roughly divided into the following steps: x) Returning the grinding wheel and processing table to their original positions and retracting the processing diameter sizing device, and these processes are executed in sequence. be done.

Next, a detailed flow of each of the above steps will be explained.

First, in step i of performing end face positioning, the CPU 21
As shown in FIG. 6, at the same time as the start button is pressed, end face positioning block data is read in step 100, and in the next step 101, the servo motor 14 is driven by the pulse output from the drive circuit 17, and the machining table 13 is is moved to the end face positioning start position P1. In step 102, a control signal is output to the hydraulic circuit 18, and the end face positioning device 15 is advanced to the forward end position, and in the next step 103, the processing table 13 is at the end face positioning starting position! It is further moved to the right from the PI, and during the leftward movement, it is determined in step 104 whether the emergency return button is ON, and in step 105 it is determined whether the end face sizing signal is output, and the end face sizing signal is output. If not, the process returns to step 103 and the rightward movement of the processing table 13 is continued.

If the emergency return button is turned on during the rightward movement of the machining table 13, the process proceeds to steps 107 to 111 and executes this process. In step 107, the block number currently being executed is stored in the storage memory 241, and then in step 1
At 08.109, leftward movement of the processing table 13 is temporarily stopped, and the end face positioning device 15 is retreated to the backward end.
Thereafter, in step 110, the processing table 13 is returned to the end face positioning start position P1, and in the subsequent step 111, the position data of the stop position is stored in the stop position storage memory 242, and the series of emergency return processing is completed.

On the other hand, if the end face sizing signal is output while the processing table 13 is moving to the left, the process proceeds to steps 106 and 107. In this step 106, the rightward movement of the processing table 1 wide 3 is stopped, and the end face positioning device 15 is retreated to the backward end, thereby completing a series of end face positioning operations.

Thereafter, the process returns to step ii of the main flow in FIG. 5, and after setting the contents of the indexing counter IC to zero in step ii, the machining diameter sizing device 19 is advanced in step iii, and then the plunger is moved in step iv. Cut grinding is performed. For example, plunge cut grinding is performed three times at the first processing location Wl of the workpiece W shown in FIG. 10, and at the same time as the plunge cut grinding is completed, the process proceeds to step (2) and traverse grinding is started.

FIG. 7 shows the detailed flow of traverse grinding. When the plunge cut grinding is completed, the grinding wheel G is at position P4, and the process advances to step 200 to read the traverse grinding block data and proceed to the next step 201. Then, the grinding wheel G is advanced by a minute amount of cutting, and at the same time as reaching the cutting advance end, traverse feeding of the processing table 13 is started in step 202. During the traverse feed, in step 203 it is determined whether the emergency return button is ON, in step 204 it is determined whether the traverse end is reached, and in step 205 it is determined whether the machining diameter sizing signal is output or not. is determined. If it is not the traverse end in this step, the process returns to step 202 and the processing table 13 continues moving to the right. I also reached the end of the traverse,
If the cutting outer diameter sizing signal is not output, the process returns to step 201 again, the grinding wheel G is advanced by a minute amount of cutting, and after cutting, the traverse direction of the machining table 13 is switched to the left direction, and then the same as above is performed. Traverse grinding is then performed.

During this traverse grinding, if the emergency return button is turned on, the process proceeds to steps 207 to 211 and this process is executed. In step 207, the block number currently being executed is stored in the storage memory 241, followed by steps 208 and 2.
In step 09, the traverse feed of the processing table 13 is temporarily stopped, and the grinding wheel C is retreated to the retreat end.Then, in step 210, the processing table 13 is returned to the traverse grinding start position P4, and then in step 211, the processing table 13 is returned to the stop position. The data is stored in the stop position storage memory 242, and a series of emergency return processes are completed.

On the other hand, when the outer diameter sizing signal is output during the above-mentioned traverse grinding, the process returns to step vi of the main flow in FIG.
In this step vi, it is determined whether the content of the index counter IC is 2 or not. At this time, the content of the indexing counter TC is zero, so the process proceeds to step vii, where the machining diameter sizing device 19 and the grinding wheel G are retracted, and then the table indexing operation is performed at the next step.

FIG. 8 shows a detailed flow of the table indexing operation. Simultaneously with the retraction of the machining diameter sizing device 19 and the grinding wheel G, the process proceeds to step 300, where block data for the table indexing operation is read, and the next step 301 Now, the table is indexed. During indexing of this table, it is determined in step 302 whether the emergency return button is ON, and in step 303 it is determined whether indexing is complete. If the indexing is not completed in this step, the process returns to step 301 to continue indexing the table.

If the emergency return button is turned on during this table indexing, the process advances to steps 305 to 307 and this process is executed. In step 305, the block number currently being executed is stored in the storage memory 241, then in step 306, the processing table 13 is moved to the next index position P5, and then in step 307, the position data of the stop position is stored in the stop position memory. The data is stored in the memory 242, and a series of emergency return processes are completed.

On the other hand, when the above-mentioned table indexing operation is completed, the process returns to step IX of the main flow in FIG. The diameter sizing device 19 moves forward, plunge cut grinding in step iv, and traverse grinding in step V are performed to grind the second processing location W2 of the workpiece W.

This first. 2nd processing location w1. When the grinding of the third machining point W3 is completed in the same manner as the grinding of w2, the index counter I
The content of C becomes 2, and as a result, the process proceeds to step X, where the grinding wheel G and processing table 13 are sequentially retreated to the original position PO.
Further, the machining diameter sizing device 19 moves back, and the entire machining cycle ends.

When the emergency return button is pressed during the machining cycle, the block number at which the operation stopped is stored in the storage memory 241 as described above, and the position data of the stop position is stored in the stop position record 1. Each is stored in the α memory 242. Therefore, at the same time as the machine is restarted, the block number at the time the machine stopped is read from the storage memory 241 in step 400 of FIG.

It is determined whether the block is an end face positioning block or a traverse grinding block, and depending on the determination step 4
03, 404, or 405, the current position data is read from the stop position storage memory 242, and if the end face positioning operation is in progress at that time, the process proceeds to step 102 in FIG. 5, and the end face positioning operation is started from this step 102. do. In this way, by performing the operation from the end face starting position P1 instead of the original position PO, it is possible to restart the apparatus in a short time.

If the stop is during traverse grinding, the process proceeds to step 213 in FIG. 6, in which the grinding wheel G is advanced, and then the process proceeds to step 202 to start traverse grinding. At this time as well, traverse grinding can be restarted in a short time by performing the operation from traverse grinding start position P2 instead of the original position PO.

Furthermore, if the stop is during the first table indexing, the processing table 13 has already moved to the next indexing position P, as described above.
Therefore, at the same time as the process proceeds to step 303 in FIG. 8, an indexing completion signal is output, and immediately the second
Grinding of the grinding location W2 is started.

<Effects of the Invention> As described above, the present invention stores the block number indicating the operating state at that time and the position data of the stopped position when the emergency return is performed during the grinding cycle, and upon restart, the block number is stored. Based on this memory, the operation is started based on the stopped position, so there is no need to return to the original position and restart from the first operation cycle, and restart can be done easily and quickly. It has the advantage of being able to

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the concept of the present invention, Fig. 2 is a configuration diagram showing a numerical control device and a grinding machine according to a specific embodiment of the invention, and Figs. 3 and 4 show control programs. Figures 5 to 9 are flowcharts showing the processing steps of the CPU. Figure 5 is a flowchart of the entire grinding cycle, Figure 6 is a detailed flowchart of end face positioning operation, and Figure 7 is a detailed flowchart of traverse grinding operation. , FIG. 8 is a detailed flowchart of the table indexing operation, FIG. 9 is a detailed flowchart of restarting, and the first
Figure 0 is a cycle diagram showing the relationship between the grinding wheel and the workpiece during grinding. 10...Grinding machine, 12.14...Servo motor, 1
6.17... Rotary encoder, 20... Numerical control device, 21... CPU, 24... RAM, 241
...Storage memory, 242...Stop position storage memory, 2
5...ROM.

Claims (1)

[Claims] (1) In a numerical control device that sequentially gives a series of programmed operation commands to a machine tool to perform machining operations, when an emergency return command is output, the machine is currently activated among the series of operation commands output to the machine. an operation state storage means for storing the block number of the operation being performed; a movement control means for moving to a predetermined stop position and stopping when an emergency return command is output; and a stop position for storing position data of this stop position. The apparatus is characterized by being provided with a storage means and a start control means for starting the operation from the stop position stored in the stop position storage means and from the operation state stored in the operation state storage means when restarting. numerical control device.