JPH071271A - Numerically controlled machine tool - Google Patents

Abstract

PURPOSE:To perform high speed, high-precise, and programmable conversion of a tool by providing a means to calculate and output positioning data of a servo motor according to a tool converting function order. CONSTITUTION:In a PC executing processing part 4, an indexing direction, in which a servo motor 9 is positioned according to a PC function order, and a positioning amount are calculated by a tool indexing means 6 from a tool number outputted from an NC and an present selected tool number. The calculating result is transferred to an NC data processing part 7 and by controlling the servo motor 9, a tool is converted. Data transferred by the tool indexing means 6 and the operation program of an NC data containing part 2 are processed by an NC processing part 7 and distributed to a servo motor control part 8, and I/O processing is effected between the PC executing part 4 and the NC data processing part. In the servo motor control part 8, a servo motor 9 to effect positioning based on data distributed by the NC data processing part 7 is controlled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a numerically controlled machine tool, and more particularly to a numerically controlled machine tool having a numerical controller having a programmable controller built therein.

[0002]

2. Description of the Related Art In a conventional numerically controlled machine tool having a large number of tools, a PC performs a sequence process for tool selection according to a tool number output from a numerical controller (NC) to mechanically exchange tools. It was

[0003]

In the conventional numerically controlled machine tool described above, the tool change is made by adding a sensor for detecting the position and a mechanical part for positioning to the tool change. The machine tool has the disadvantages of increased cost, mechanical complexity, and non-programmability.

[0004]

A numerically controlled machine tool according to the present invention is a machine tool in which a plurality of mounted tools are positioned by a servomotor, and N for controlling the servomotor.
In the C device, means for inputting the transfer program and the ladder program of the NC device, means for storing the operation program and the ladder program, and positioning data for the servo motor by a function command for exchanging the tool from the PC execution unit It has means for calculating and outputting and means for controlling the servomotor based on the data.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of an embodiment of the present invention.

The input unit 1 inputs an operation program and a ladder program of the numerical control device. The NC data storage unit 2 stores the operation program of the numerical control device. The PC data storage unit 3 stores the ladder program. The PC execution processing unit 4 performs I / O processing with the NC and the machine based on the ladder program. I / O interface 5
Is connected between the PC and the machine.

The tool indexing means 6 determines the indexing direction and the positioning amount for the servo motor to position from the tool number output from the NC in the PC execution processing section 4 and the currently selected tool number by the PC function command. Is calculated and the result is transferred to the NC data processing unit 7 to control the servo motor and perform tool exchange. NC data processing unit 7
The operation program of the C data storage unit 2 and the data transferred by the tool indexing unit 6 are processed and distributed to the servo motor control unit 8, and I / O processing is performed with the PC execution processing unit 4. The servo motor control unit 8 is the NC data processing unit 7.
The servomotor 9 for positioning is controlled based on the data distributed by.

FIG. 2 is a diagram showing function commands for indexing tools in this embodiment. 10 is a function command (SVROT) for indexing a tool, and 11 to 16 are SVROT.
A T command parameter, 11 is a parameter for designating the total number of divisions, 12 is a parameter for designating a positioning amount per minute in the minimum setting unit of NC, and 13
Is a parameter that specifies the indexing direction with 0, 1,
Specify 0 for the shortest index, 1 for right rotation, and 2 for left rotation. 14
Is a parameter that specifies the RAM area that stores the selected tool number, 15 is a parameter that specifies the RAM area that stores the selected tool number, and 16 is the indexing completed It is a parameter that specifies a relay to be output at a time, 17 is a condition relay for whether or not the SVROT command performs processing, and 18 is an SVR.
It is a relay that outputs when there is a problem in the setting data from 11 to 16 which are the parameters of the OT command.

FIG. 3 is a flowchart of the SVROT10 instruction of this embodiment. The processing starts when the condition relay 17 is ON. Reference numeral 19 is a process for reading all parameters from 11 to 16, and 20 is branched to the process of 22 when the shortest direction index is determined in the parameter data check process of 13, and otherwise moved to the process of 21. Reference numeral 21 is a parameter data check process when the indexing direction is other than the shortest direction indexing, 22 is the shortest direction indexing process, and 23 is a check process of the selected tool number and the selected tool number. The process branches to the process, and otherwise the process moves to 24. Reference numeral 24 denotes a tool number being selected and a tool number checking process to be selected. If the selected tool number is smaller than the selected tool number, the process branches to 26, otherwise the process moves to 27.

25 is a process for calculating the number of divisions to be indexed as "0" when the selected tool number is equal to the selected tool number, and 26 is a smaller tool number than the selected tool number. Is a process of calculating the number of divisions to be indexed, and 27 is a process of calculating the number of divisions to be indexed when the selected tool number is larger than the selected tool number.
8 is a check process in which the smaller division number among the division numbers calculated in 26 and 27 is used as the division number, and 29 is the division number obtained by dividing the calculation result in 26 when 26 is smaller in the calculation results in 26 and 27. 30 is a process in which when 27 of the calculation results of 26 and 27 are small, the calculation result of 27 is used as the number of divisions, and 21 is the right rotation direction index in the parameter data check process of 13. In the case of 32, the process branches to 32, and in the case of left rotation direction indexing, the process proceeds to 31.

Reference numeral 31 is a process when the indexing direction is a left rotation direction index, 32 is a process when the indexing direction is a right rotation direction index, and 33 is a tool number being selected and a tool to be selected. In the number checking process, if the selected tool number is larger than the selected tool number, the process branches to 34, otherwise the process moves to 35.

Reference numeral 34 is a process for calculating the number of divisions to be indexed when the selected tool number is larger than the selected tool number, and 35 is a process for calculating 36 when the selected tool number is equal to the selected tool number. If the tool number being selected is smaller than the selected tool number, the process branches to step 37. 36 is a process for calculating the number of divisions to be indexed as “0” when the selected tool number is equal to the selected tool number, and 37 is an index when the selected tool number is smaller than the selected tool number. 38 is a process for calculating the number of divisions to be performed. 38 is a process for checking the selected tool number and the selected tool number. If the selected tool number is smaller than the selected tool number, the process branches to 40, otherwise. Moves to the processing of 39.

If the selected tool number is equal to the selected tool number, 39 branches to the process of 42, and if the selected tool number is larger than the selected tool number, the process moves to 41. Four
0 is a process for calculating the number of divisions to be indexed when the selected tool number is smaller than the selected tool number, and 41 is an indexed division when the selected tool number is larger than the selected tool number. When the tool number being selected is equal to the tool number to be selected, 42 is a process for calculating the number of divisions to be indexed as "0", and 43 is the calculated number of divisions and 1 division. This is a process for calculating the movement amount for the servo motor to perform positioning based on the corresponding positioning amount 12, and 44 is a process for transferring the positioning amount and the indexing direction calculated in 43 to the NC.

FIG. 4 is a diagram of tool indexing for selecting a tool by the SVROT command of this embodiment. 45 is a diagram showing that the selected tool number 14 is "2".
6 is a diagram showing that the tool number 15 desired to be selected is "7". When the relay 17 is turned on in the state of 45, the processing of the SVROT command is started. The indexing direction is calculated as the shortest direction because the indexing direction 13 is "0". Since the selected tool number 14 is “2” and the desired tool number 15 is “7”, the tool number “1”,
The directions of "8" and "7" are calculated. If the number of divisions is 3 and the positioning amount 12 per division is 45000, the positioning amount is 3 (the number of divisions) × 45000 = 15,000.
Calculate μm. NC the calculated indexing direction and positioning amount
By transferring the data to the data processing unit 7, the tool is replaced at the position of the tool number "7" desired to be selected.

[0015]

As described above, according to the present invention, the numerical control device calculates the positioning direction and the positioning amount based on the tool number output from the numerical control device and the selected tool number by the functional instruction of the programmable controller. By commanding and positioning the axis of the servo motor at a predetermined position, it is possible to reduce the number of position detection sensors and mechanical parts for tool replacement, and to perform tool replacement programmatically at high speed and with high accuracy. There is.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a diagram showing a function command for tool indexing according to the present embodiment.

FIG. 3 is a flowchart for explaining the operation of this embodiment.

FIG. 4 is a diagram showing tool indexing according to the present embodiment.

[Explanation of symbols]

 1 Data Input Section 2 NC Data Storage Section 3 PC Data Storage Section 4 PC Execution Processing Section 5 Machine I / O Interface 6 Tool Indexing Means 7 NC Data Processing Section 8 Servo Motor Control Section 9 Servo Motor

Claims (1)

[Claims] 1. A machine tool in which a plurality of tools to be mounted are positioned by a servo motor, an NC device for controlling the servo motor, a means for inputting a transfer program and a ladder program of the NC device, and the operation program. And means for storing the ladder program,
A numerically controlled machine tool comprising means for calculating and outputting positioning data of the servo motor according to a function command for exchanging the tool from a PC execution unit, and means for controlling the servo motor by the data.