JPH03210602A - Original point setting system - Google Patents

Abstract

PURPOSE:To set an original point with a simple operation by shifting a machine working part by an extent equal to one grid if the stopped grid is not coincident with the original point. CONSTITUTION:A machine working part is positioned at a point P1 precedent a grid G4 that is defined as an original point. In this case, the point P1 is not required to be set at a position not distant away from the original point by one grid or less as long as the setting position is precedent the original point. Then a mode selection switch of a machine control panel is set at an original point setting position so that an original point resetting mode ZRN. When a jog feed button +X of an axis X is turned on, the machine working part is stopped at a grid G3 nearest the point P1. An operator judges that the grid G3 is not coincident with the original point based on the scale, etc., of the machine working part. Then the operator turns on an original point shift switch ZRX. The machine working part moves toward an axis +X by an extent equal to one grid based on the signal ZRX and is shifted onto a grid G4. Thus the original point can be set for the machine working part.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a dogless origin setting method that does not use a deceleration dog, and more particularly to an origin setting method that allows a grid corresponding to the origin to be selected.

[Conventional technology]

In small machine tools, it is difficult to provide a deceleration dog for the origin setting operation, so dogless origin setting is used.

In dogless origin setting, the machine moving parts are positioned near the origin using jog feed. Next, when you set the return-to-origin mode and perform jog feed, it will stop on the nearest grid, and that point will become the origin.

[Problem to be solved by the invention]

However, this dogless origin setting requires accurate positioning near the origin. That is, in a normal machine, the grid interval is about 6 to 10 mm, and unless the machine operating parts are accurately positioned within this value range, accurate origin setting cannot be performed. - Once the origin setting operation is performed, in order to shift the origin, it is necessary to return the machine operating part to a position away from the origin and perform the origin setting operation again, making the origin setting operation complicated.

The present invention has been made in view of these points, and it is an object of the present invention to provide an origin setting method that allows the origin to be set at a desired grid position by moving a machine operating section on a grid.

[Failure to solve the problem]

In order to solve the above problems, the present invention uses a origin setting method that uses a grid to set the origin without using a deceleration dog, by positioning the machine moving part in front of the origin and using the origin return mode. turn on, turn on the jog button, position the mechanical operating section on the grid, determine whether the grid is the origin, and if it is not the origin, further shift the mechanical operating section to the next grid, An origin setting method is provided, characterized in that the origin of the machine operating section is set at a desired origin by repeating the determination and the shift.

[Effect]

Position the machine moving part near the origin. Next, when you enter return-to-origin mode and press the jog button, the mechanical moving parts will stop on the nearest grid.

The operator determines whether this grid is the origin based on, for example, the scale of the machine. If it is not the origin, the mechanical operating section is shifted to the next grid. Repeat this operation,
Set the origin of the machine moving parts.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 2 is a time chart for explaining the operation of the origin setting method of the present invention. First, the machine operating section is positioned at a point P1, which is in front of the grid G4, which is the origin. This point P1 does not need to be within one grid from the origin as long as it is before the origin.

Next, set the mode selection switch on the machine operation panel to the origin setting position to enter the origin return mode (ZRN). When the X-axis jog feed button (+X) is turned on, the mechanical operating section stops on the grid G3 closest to the point PI. The operator determines that this grid G3 is not the origin from the scale of the machine operating section, etc., and turns on the origin shift switch (ZRX).

The mechanical operating section is moved in the X-axis direction by one grid in response to this signal ZRX, and is shifted onto grid G4, which is the origin. This completes the origin setting of the machine operating section.

Therefore, in the software in the numerical control device, in the zero point return mode (ZRN), the zero point shift switch ZRX
When turned on, it is sufficient to output a command to move the machine operating part by one grid.

FIG. 3 shows a numerical control device (CNC) for implementing the present invention.
) is a block diagram of the hardware.

The processor 11 controls the entire numerical control device according to a system program stored in the ROM 12. ROM
12 is an EPROM or an EEPROM. An SRAM is used as the RAM 13, and various data are stored therein. The non-volatile memory 14 is a program 14a.
, parameters, etc. are stored, and since the CMO 8 and the like with battery backup are used, the contents are retained even after the numerical control device is powered off.

PMC<”:j programmable machine controller)
15 receives commands such as M function, S function, 1 function, etc., decodes and processes the commands by a sequence program 15a, and outputs an output signal for controlling the machine tool. It also receives a limit switch signal from the machine side or a switch signal from the machine operation panel, processes it in the sequence program 15a, and outputs an output signal to control the machine side.
Signals necessary for the numerical control device are sent to the RAM via bus 25.
13 and read by the processor 11.

The graphic control circuit 16 converts data stored in the RAM 13, such as the current position and amount of movement of each axis, into display signals.
It is sent to the display device 16a, and the display device 16a displays it. As the display device 16a, a CRT1 liquid crystal display device or the like is used. The keyboard 17 is used to input various data.

The axis control circuit 18 receives a position command from the processor 11 and outputs a speed command signal for controlling the servo motor 20 to the servo amplifier 19. The servo amplifier 19 amplifies this speed command signal and drives the servo motor 20. A pulse coder 21 that outputs a position feedback signal is coupled to the servo motor 20. The pulse coder 21 feeds back position feedback pulses to the axis control circuit 18. In addition to the pulse coder 21, a position detector such as a linear scale may be used. These elements are required for the number of axes, but since the configuration of each element is the same, only the l-axes are shown here.

The input/output circuit 22 exchanges input/output signals with the machine side.

That is, the PMC 15 receives limit switch signals from the machine side and switch signals from the machine operation panel, and reads these signals. It also receives an output signal from the PMC 15 for controlling a pneumatic actuator, etc. on the machine side, and outputs it to the machine side.

There is a mode selection switch on the machine operation panel. When the home return mode is selected, the home return mode signal ZRN is activated, when the jog button is pressed, the signal X is activated, and when the home shift switch is pressed, the signal ZRX is activated for machine operation. The signal is sent from the panel 26 to the input/output circuit 22. The manual pulse generator 23 outputs a pulse train for precisely moving each axis according to the rotation angle, and is used to precisely position the machine.

The manual pulse generator 23 can be mounted on the machine operation panel 26.

In the figure, the spindle control circuit, spindle amplifier, spindle motor, etc. for controlling the spindle are omitted.

Further, although there is one processor here, a multi-processor system using a plurality of processors can be used depending on the system.

FIG. 1 is a flowchart of processing of the origin setting method of the present invention. In the figure, the number following S indicates the step number.

[S1] Use the jog button to position the machine moving part near the origin.

[S2] Operate the mode switch on the machine simulation board 26 to enter the zero point return (ZRN) mode.

[S3] When the X-axis jog button +X is turned on, the machine operating section stops at the nearest grid.

[S4] The operator determines whether the point is the origin based on the scale of the machine operating section, etc., and if it is not the origin, presses the origin shift switch (ZRX).

[S5] The numerical control device shifts the machine operating section by one grid. These steps 84 to S6 are repeated until the origin is reached.

In this way, the origin of the machine operating section can be set accurately. Therefore, the initial positioning of the machine moving part only needs to be in front of the origin, and does not need to be exactly within one grid. Therefore, the origin of the machine operating section can be set with a simple operation.

〔Effect of the invention〕

As explained above, in the present invention, when the stopped grid is not the origin, the machine moving part is shifted by one grid, so even when setting the dogless origin, there is no need to accurately position it near the origin, and it is easy to use. Origin setting operation can be performed by operation.

[Brief explanation of drawings]

FIG. 1 is a flowchart of the processing of the origin setting method of the present invention, FIG. 2 is a time chart for explaining the operation of the origin setting method of the present invention, and FIG. 3 is a numerical control device for implementing the present invention ( CNC
) is a block diagram of the hardware. 11 -------Processor 12 ----ROM 13...RAM 4a 15 5a 6a 7 8 9 0 1 2 3 5 6 Non-volatile memory addition programmable machine controller PMC (7" programmable machine controller) sequence Program display device Keyboard Axis control circuit Servo amplifier Servo motor Pulse coder Input/output circuit Manual pulse generator Nox Machine operation panel

Claims (2)

[Claims] (1) In the origin setting method that uses a grid to set the origin without using a deceleration dog, position the machine moving part near the origin, turn on the origin return mode, and turn on the jog button. positioning the mechanical operating part on a grid, determining whether the grid is the origin, and if it is not the origin, further shifting the mechanical operating part to the next grid, repeating the determination and the shifting,
An origin setting method characterized in that the origin of the machine operating section is set at a desired grid position. (2) The origin setting method according to claim 1, wherein the shift to the next grid is performed by an origin shift switch on a machine operation panel.