JPH01124003A - Numerical controller - Google Patents

Abstract

PURPOSE:To omit the mechanical setting of simultaneous operation starting point by supplying a rap motion signal from a system control part to a sequence control part when an axis set up by a user program reaches an optional position during the execution of one block. CONSTITUTION:The system control part 3 transmits/receives information to/from a main memory 2 during the execution of one block, and when an optional axis set up by the user program reaches an optional position, supplies a rap motion signal RM to the sequence control part 12. Then, the control part 12 starts rap motion by the rap motion signal RM. Consequently, the mechanical setting of a starting point of simultaneous operation in which the fitting of constitution parts, the adjustment of a fitting position, etc., are difficult can be completely omitted.

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a numerical control device.

[Prior Art] FIG. 4 is a block diagram showing a conventional numerical control device. In the figure, (1) is a numerical control device (hereinafter referred to as NC), (2) is a preprogrammed program and A main memory that temporarily stores information such as processing information, (3) a system control section, (4) a setting display board that includes a setting section consisting of a keyboard and a display section, (5)
) is a paper tape reader that reads the paper tape that stores processing information, (6) is a servo control unit that controls the servo motor (8), and (7) is a speed that detects the movement amount and rotation speed of the servo motor (8). The detector (9) is a speed detector (1) that detects the rotation speed of the spindle motor (10).
1) is a spindle control unit that controls the spindle motor (10);
2) is a sequence control unit that sequentially controls the machine tool (13); (14) is a sequence memory that stores a sequence program for controlling the machine tool (13);
5) is a simultaneous operation start point limit switch that detects the simultaneous operation start point.

Automated processing lines and the like are actively working to shorten processing time in order to reduce product costs. In order to shorten this machining time, unnecessary motions are eliminated, and all parts where simultaneous motion (lap motion) is possible are made to operate simultaneously.

Wrap motion refers to executing multiple operations at the same time, and by performing wrap motion, takt time can be shortened. For example, Figures 5(a) and (b)
As shown in Figure 2, assume that the takt times of action A and action B are 10 seconds and 20 seconds. If actions A and B are executed consecutively without wrapping, that is, if action B is started after action A ends, as shown in Figure 5 (C), the takt time will be 10 seconds + 20 seconds = It will be 30 seconds. This is shown in Figure 5 (d
), if you start operation B during operation A, for example 5 seconds after the start of operation A, the takt time will be 10 seconds + (20 -
5) Seconds = 25 seconds, which will be shortened by 5 seconds by continuous operation.

However, although conventional NCs can output multiple commands at the beginning or end of one block of a program, it is impossible to output multiple commands during the operation within one block of a program. For example, if the cutting is performed at a feed rate of 100 mm/min with a cutting feed of 100 ml11, the cutting time will take 1 minute. Even if there is a movement that can be performed simultaneously at an intermediate point of 50 mm between them, there is nothing that can be done with NC, and it can only be done using a mechanical limit switch.

FIG. 6 is a diagram showing the relationship between the limit switch for simultaneous operation start (15) and the machine tool (13). In FIG. 6, (16) is a moving part driven by a servo motor (8), (17 ) is a tool attached to the tip of the moving part (16) to process the workpiece (19), and (18) is a dog that pushes down the bar of the limit switch (15) for starting simultaneous operation; is fixed to the moving part (16).

Figure 7 shows the program rGOI of blocks that perform simultaneous operations.
FIG. 8 shows the operation flow of the system control unit during execution of “Z100FOOM△△”.

Next, the operation will be explained.

First, the system control unit (3) decodes the “program rGOIZ100FOOM△△” in block 2 and outputs a Z-axis movement command of 100 mm Z to the servo control unit (6), and at the same time outputs a movement command to the sequence control unit (12). The MΔΔ code is output (steps 5T-9, 5T-10).

The system control section (3) further includes a servo control section (6).
If you continue to output movement commands to , the Z-axis will pass through position (80) (step 5T-11) and reach position (100) (step 5T-12), and the execution of that block will end and the next Move to block.

On the other hand, the sequence control unit (12) determines the presence or absence of the M△△ code during the above operation of the Z axis (step 5T-13).
, when the M△△ code is present, the bar of the simultaneous operation start point limit switch (15) is pushed down by the dog (18), and it is determined whether the simultaneous operation start point limit switch is ON or not. Step 5T-14 ), when this simultaneous operation start point limit switch is turned ON, simultaneous operations are started (step 5T-15).

[Problems to be solved by the invention] Conventional numerical control devices are configured as described above, so in order to realize simultaneous operations, it is necessary to mechanically set the starting point of simultaneous operations using limit switches, dogs, etc. It is necessary to set the limit switch, and if the machine is complex, there are problems in that it is difficult to install the limit switch, and it is difficult to adjust the position of the limit switch. Furthermore, when there are several types of objects (workpieces) or when the workpieces are changed, there is a problem in that it is necessary to install several limit switches and to change the positions of the limit switches.

This invention was made to solve the above-mentioned problems, and it simplifies the process by eliminating the need for mechanical setting of simultaneous operation start points and allowing simultaneous operation start points to be added or changed simply by changing the user program. The purpose is to obtain a numerical control device with

[Means for Solving the Problems] The numerical control device according to the present invention transmits and receives information to and from a main memory during execution of one block, and inputs and receives information from an arbitrary axis set by a user program to the main memory. When the position is reached, a lap motion signal is supplied to the sequence control section.

[Operation] The wrap motion signal in the present invention is output to the sequence control section when an arbitrary axis programmed by the user reaches an arbitrary position, so that the sequence control section can perform the wrap motion using the wrap motion signal. Start.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1st
In the figure, (1) is the NC, (2) is the main memory that temporarily stores programs programmed with blocks that perform simultaneous operations and machining information, etc., (3) is the system control unit, and (4) is the keyboard. (5) a setting display board having a setting section and a display section; (5) a paper tape reader that reads the paper tape on which processing information is recorded;
6) is a servo control unit that drives and controls the servo motor (8), (7) is a speed detector that detects the travel amount and rotation speed of the servo motor (8), and (9) is the rotation speed of the main shaft motor (10). The speed detector (11) detects the spindle motor (
(12) is a sequence control unit that sequentially controls the machine tool (13);
4) is a sequence memory that stores a sequence program for controlling the machine tool (13), and (RM) is a lap motion signal for notifying the simultaneous operation start point from the system control unit (3) to the sequence control unit (12). It is.

Figure 2 shows the program rGOI of blocks that perform simultaneous operations.
FIG. 3 shows the operation flow of the system control section during execution of Z100F100G100280J.

First, the system control unit (3) performs the program of the above block.
decode "fymrGOIZ100F100G100280" and set the Z-axis speed 100++un to the servo control unit (6).
/minute movement command is output, and at the same time it is determined by "G100" that there is lap motion processing (step 5
T-1, 5T-2).

Also, since it is programmed as “G100Z80”,
In the lap motion processing, the Z-axis position is periodically read out (step 5T-3), and it is determined whether it has exceeded the set position (80) (step 5T-4). If it exceeds the position, a wrap motion signal is output to the sequence control unit (12) (step 5T-5).The system control unit (3) continues to output movement commands to the position (100), and the Z-axis When (100) is reached (step 5T-6), execution of that block is ended and the process moves to the next block.

On the other hand, when the sequence control unit (12) determines that the wrap motion signal (RM) has arrived (step 5T-7),
Simultaneous operations are started (step 5T-8).

In the second embodiment, the lap motion signal is set at one point, but if the lap motion signal can be set at several points, it is possible to set the number of simultaneous operation start points at several points in one block.

[Effects of the Invention] As described above, according to the present invention, when an axis set by a user program reaches an arbitrary position during execution of one block, a lap motion signal is supplied from the system control unit to the sequence control unit. I configured it so that
Lap motion is possible for attaching and installing component parts without requiring any difficult mechanical settings such as position adjustment.
This has the effect of providing a simplified numerical control device that can add or change the start point of the lap motion simply by changing the user program.

[Brief explanation of the drawing]

FIG. 1 is a block configuration diagram showing a numerical control device according to an embodiment of the present invention, FIG. 2 is an operation flow diagram of the system control section when simultaneous operations are executed in this device, and FIG. 3 is an operation flow diagram of the sequence control section. 4 is a block configuration diagram showing a conventional numerical control device, FIG. 5 is an explanatory diagram of lap motion, FIG. 6 is a diagram showing the relationship between the limit switch for simultaneous operation start point and the machine, and FIG. FIG. 8 is an operation flow diagram of the system control section during the simultaneous operation. FIG. 8 is an operation flow diagram of the sequence control section. In the figure, (2) is the main memory, (3) is the system control unit, (6) is the servo control unit, (8) is the servo motor, (12) is the sequence control unit, (13) is the machine tool,
(14) is a sequence memory, and (RM) is a wrap motion signal. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Agent: Patent attorney Masuo Oiwa (and 2 others) Figure 7 Figure 8

Claims (1)

[Claims] A sequence memory that stores a sequence program for controlling a machine tool, a sequence control unit that sequentially controls the machine tool based on the sequence program for control from the sequence memory, and a main memory that stores preprogrammed information. and a servo control section that controls a servo motor, and at least the main memory, the servo control section, and the sequence control section, and transmitting and receiving information between the main memory and the servo control section to move any axis programmed in the main memory to any position. A numerical control device comprising a system control unit that supplies a lap motion signal to the sequence control unit when reached.