JPH05181522A - Numerical controller - Google Patents

Abstract

PURPOSE:To control each shaft at an irreducibly minimum interpolation unit by adding unit conversion circuits before and behind an interpolation circuit. CONSTITUTION:Data analyzed by an input circuit 1 are stored in a position register 2 for the unit of each shaft. After the respective shafts are converted to the same unit by an input unit conversion circuit 6, the data are inputted to an interpolation circuit 3. Based on an interpolating command (linear or circular arc, etc.,) analyzed by the input circuit 1, the interpolation circuit 3 converts the data to an interpolation amount per unit time. The interpolation amount outputted from the interpolation circuit 3 is outputted through an output unit conversion circuit 7 to a position register 4 for output. The outputted interpolation amount per unit time is outputted through an output pulse conversion circuit 5 to shaft amplifiers corresponding to the respective shafts. Since the unit conversion circuits are added before and behind the interpolation circuit 3, the input/output unit can be selected for each shaft, and each shaft can be controlled for the irreducibly minimum unit.

Description

Detailed Description of the Invention

[0001]

[Field of Industrial Application] The present invention relates to a production system for a machine tool or the like equipped with a numerical control device.

[0002]

2. Description of the Related Art FIG. 2 is a simple block diagram from an input command from a machining program to output pulse conversion.
In the figure, 1 is an input circuit that analyzes the data of a machining program and converts it into data for each axis, 2 is a position register for each axis, 3 is an interpolation circuit, 4 is a position register for output, and 5 is an output pulse. It is a conversion circuit. FIG. 3 is a simple block diagram of the numerical control device. In the figure, 1 is a CPU that controls the entire numerical control device, 2 is an input circuit that analyzes an input command, 3 is an input command tape, 4 is an output unit conversion circuit, 5 is an axis control amplifier that controls each axis motor, 6 is a shaft motor.

Next, the operation will be described. In FIG. 3, the machining program punched on the input command tape 3 is input to the CPU 1 via the input circuit 2. The inputted machining program is analyzed and converted into a command for each control axis. The converted axis command is output to the axis control amplifier 5 via the output unit conversion circuit 4 and then to the axis motor 6. Further, in FIG. 2, the data analyzed by the input circuit is stored in the position register for each axis and input to the interpolation circuit. The interpolation circuit converts the interpolation command (straight line, circular arc, etc.) analyzed by the input circuit into an interpolation amount per unit time, and outputs it to the output position register. The output interpolation amount per unit time is output to the axis amplifier corresponding to each axis through the output pulse conversion circuit.

[0004]

As described above, the command data from the machining program is output to the axis amplifier through each circuit, but the data for each axis input to the interpolation circuit must be in the same unit. Therefore, the input command from the machining program and the output command from the interpolation circuit are in the same unit. In general machine tools, there is no problem if the command unit and the output unit are the same, but in a grinding machine etc., precise interpolation units are required for only some axes, but with conventional control methods, all axes are required. Had to be a precise interpolation unit.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain a numerical control device capable of controlling each axis in the minimum necessary interpolation unit.

[0006]

The numerical control device according to the present invention is such that an input / output unit can be designated for each axis through a unit conversion circuit before and after an interpolation circuit.

[0007]

By allowing the minimum required interpolation unit to be selected for each axis unit, the room for selectivity in the machine configuration can be increased. Further, generally, a detector having a rough interpolation accuracy can be manufactured at a low cost, which causes a reduction in cost.

[0008]

【Example】

Example 1. FIG. 1 is a simple block diagram from an input command from a machining program to output pulse conversion. In the figure, 1 is an input circuit for analyzing data of a machining program and converting it into data for each axis, 2 is a position register for each axis, 3 is an interpolation circuit, 4 is a position register for output, 5
Is an output pulse conversion circuit, 6 is an input unit conversion circuit, and 7 is an output conversion circuit.

Next, the operation will be described. The data analyzed by the input circuit 1 in FIG. 1 is stored in the position register 2 for each axis, and after each axis is converted into the same unit by the input unit conversion circuit 6, it is input to the interpolation circuit 3. . In the interpolation circuit, the interpolation amount output from the interpolation circuit, which is converted into the interpolation amount per unit time based on the interpolation command (straight line, circular arc, etc.) analyzed by the input circuit, is calculated by the output unit conversion circuit 7. It is output to the output position register 4 via. The output interpolation amount per unit time is output to the axis amplifier corresponding to each axis through the output pulse conversion circuit 5.

[0010]

As described above, by adding the unit conversion circuit before and after the interpolation circuit, the input / output unit can be selected for each axis, and each axis can be interpolated to the minimum required. You will be able to control in units.

[Brief description of drawings]

FIG. 1 is a simple block diagram from an input command from a machining program or the like of a numerical controller according to an embodiment of the present invention to output pulse conversion.

FIG. 2 is a simple block diagram from an input command from a machining program or the like to output pulse conversion in a conventional technique.

FIG. 3 is a simple block diagram of a numerical control device.

[Explanation of symbols]

 1 CPU 2 Input circuit 3 Input command tape 4 Output unit conversion circuit 5 axis control amplifier 6 axis motor

Claims (1)

[Claims] 1. A numerical controller that has input / output unit conversions in front and rear stages of an interpolation circuit, so that an input unit and an output unit can be arbitrarily selected for each system and each control axis.