Numerical control method and numerically controlled allaratus

• US 20020138171A1
• Filed: 03/15/2002
• Published: 09/26/2002
• Est. Priority Date: 02/22/2001
• Status: Abandoned Application

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Fukutani, Mutoshi
• Application Number:
  US10/088,137
• Publication Number:
  US 20020138171A1
• Time in Patent Office: Days
• US Class Current: 700/188
• CPC Class Codes: B23Q 15/12 Adaptive control, i.e. adjusting itself to have a performance which is optimum according to a preassigned criterion
• CPC Class Codes: G05B 2219/49077 Control of feed and spindle, cutting speed
• CPC Class Codes: G05B 2219/50202 During movement of tool towards workpiece, shut down rotation, welding gun

Abstract

In a numerically controlled apparatus having a peripheral speed uniforming control function, by performing a peripheral speed uniforming control only on coordinates of a start point of feed for cutting except for a non-cutting block, consumption of power wasted by executing the peripheral speed uniforming control on the non-cutting block is reduced.

Claims

1. A numerical control method of controlling a numerically controlled apparatus having a peripheral speed uniforming control function for controlling speed of a main spindle so that a peripheral speed becomes constant in accordance with a change in position of a reference axis during feed for cutting, comprising the steps of:

preliminarily reading and analyzing a block preceding a present block by one or more blocks; and

, on the basis of a result of the pre-reading and analysis, controlling a timing of starting the peripheral speed uniforming control function.

2. A numerical control method of controlling a numerically controlled apparatus having a peripheral speed uniforming control function for controlling speed of a main spindle so that a peripheral speed becomes constant in accordance with a change in position of a reference axis during feed for cutting, comprising the steps of:

preliminarily reading and analyzing a block preceding a present block by one or more blocks, on the basis of a result of the pre-reading and analysis;

obtaining execution time since a peripheral speed uniforming instruction is given until feed for cutting is started and main spindle reach time required to make the speed of the main spindle before the peripheral speed uniforming instruction reach the speed of the main spindle according to the peripheral speed uniforming instruction; and

controlling a timing of starting the peripheral speed uniforming control function on the basis of the execution time and the main spindle reach time obtained.

3. A numerically controlled apparatus having a peripheral speed uniforming control function for controlling speed of a main spindle so that a peripheral speed becomes constant in accordance with a change in position of a reference axis during feed for cutting, comprising:

a program pre-reading and analyzing unit which preliminarily reads and analyzes a block preceding a present block by one or more blocks; and

a peripheral speed uniforming control function start timing calculating unit which controls a timing of starting the peripheral speed uniforming control function on the basis of a result of the pre-reading and analysis of the program pre-reading and analyzing unit.

4. A numerically controlled apparatus having a peripheral speed uniforming control function for controlling speed of a main spindle so that a peripheral speed becomes constant in accordance with a change in position of a reference axis during feed for cutting, comprising:

a program pre-reading and analyzing unit which pre-reads and analyzes a block preceding a present block by one or more blocks;

a unit which obtains execution time since a peripheral speed uniforming instruction is given until feed for cutting is started and main spindle reach time required to make the speed of the main spindle before the peripheral speed uniforming instruction reach the speed of the main spindle according to the peripheral speed uniforming instruction on the basis of a result of the pre-reading and analysis of the program pre-reading and analyzing unit; and

a peripheral speed uniforming control function start timing calculating unit which controls a timing of starting the peripheral speed uniforming control function on the basis of the execution time and the main spindle reach time obtained by the unit.

5. The numerically controlled apparatus according to claim 4, wherein the peripheral speed uniforming control function start timing calculating unit starts the peripheral speed uniforming control function after time obtained by subtracting the main spindle reach time required to make the speed of the main spindle before the peripheral speed uniforming instruction reach the speed of the main spindle at the start of cutting operation according to the peripheral speed uniforming instruction from the execution time elapses since the peripheral speed uniforming instruction.

6. The numerically controlled apparatus according to claim 4 or 5, wherein each of the execution time and main spindle reach time is converted to the number of sampling times of software and the obtained number of sampling times is used.

7. The numerically controlled apparatus according to claim 4, wherein an acceleration curve or a deceleration curve of the main spindle is approximated by a plurality of straight lines, and the main spindle reach time is estimated on the basis of an equation of the straight line.

8. A numerical control method of controlling a numerically controlled apparatus having a function of controlling the speed of a main spindle, comprising the steps of:

preliminarily reading and analyzing a block preceding a present block by one or more blocks; and

controlling a timing of starting the main spindle on the basis of a result of the pre-reading and analysis.

9. A numerical control method of controlling a numerically controlled apparatus having a function of controlling the speed of a main spindle, comprising the steps of:

preliminarily reading and analyzing a block preceding a present block by one or more blocks;

on the basis of a result of the pre-reading and analysis, obtaining execution time since a peripheral speed uniforming instruction is given until feed for cutting is started and main spindle reach time required to reach the speed of the main spindle according to the peripheral speed uniforming instruction from start of the main spindle; and

controlling a timing of starting the main spindle on the basis of the execution time and the main spindle reach time obtained.

10. A numerically controlled apparatus having a function of controlling speed of a main spindle, comprising:

a program pre-reading and analyzing unit which preliminarily reads and analyzes a block preceding a present block by one or more blocks; and

a main spindle start timing calculating unit which controls a timing of starting the main spindle on the basis of a result of the pre-reading and analysis of the program pre-reading and analyzing unit.

11. A numerically controlled apparatus having a function of controlling speed of a main spindle, comprising:

a program pre-reading and analyzing unit which pre-reads and analyzes a block preceding a present block by one or more blocks;

a unit which obtains execution time since a main spindle revolution instruction is given until feed for cutting is started and main spindle acceleration time required to reach the speed of the main spindle according to the main spindle revolution instruction from start of the main spindle on the basis of a result of the pre-reading and analysis of the program pre-reading and analyzing unit; and

a main spindle start timing calculating unit which controls a timing of starting the main spindle on the basis of the execution time and the main spindle acceleration time obtained by the unit.

12. The numerically controlled apparatus according to claim 11, wherein the main spindle start timing calculating unit starts the main spindle after time obtained by subtracting the main spindle acceleration time from the execution time elapses since the main spindle revolution instruction.

13. The numerically controlled apparatus according to claim 11 or 12, wherein each of the execution time and main spindle acceleration time is converted to the number of sampling times of software and the obtained number of sampling times is used.

14. The numerically controlled apparatus according to claim 11, wherein an acceleration curve or a deceleration curve of the main spindle is approximated by a plurality of straight lines, and the main spindle acceleration time is estimated on the basis of an equation of the straight line.

19. The numerically controlled apparatus according to claim 18, wherein an acceleration curve or a deceleration curve of the main spindle is approximated by a plurality of straight lines, and the acceleration/deceleration time of said main spindle is estimated on the basis of an equation of the straight line.

15. A numerical control method of controlling a numerically controlled apparatus having a function of controlling speed of a main spindle, comprising the steps of:

preliminarily reading and analyzing a block preceding a present block by one or more blocks; and

when a result of the pre-reading and analysis satisfies a predetermined condition, stopping the main spindle even during a main spindle revolution instruction.

16. A numerical control method of controlling a numerically controlled apparatus having a function of controlling speed of a main spindle, comprising the steps of:

preliminarily reading and analyzing a block preceding a present block by one or more blocks;

when a result of the pre-reading and analysis shows that it is during a main spindle revolution instruction and a non-cutting block exists, obtaining main spindle stop time between the non-cutting block and start of feed for cutting and acceleration/deceleration time of the main spindle on the basis of the result of the pre-reading and analysis;

comparing the main spindle stop time obtained with the acceleration/deceleration time of the main spindle; and

stopping the main spindle even during the main spindle revolution instruction when the main spindle stop time is longer than the acceleration/deceleration time of said main spindle.

17. A numerically controlled apparatus having a function of controlling speed of a main spindle, comprising:

a program pre-reading and analyzing unit which pre-reads and analyzes a block preceding a present block by one or more blocks; and

a main spindle stop timing calculating unit which stops the main spindle even during a main spindle revolution instruction when a result of the pre-reading and analysis performed by the program pre-reading and analyzing unit satisfies a predetermined condition.

18. A numerically controlled apparatus having a function of controlling speed of a main spindle, comprising:

a program pre-reading and analyzing unit which preliminarily reads and analyzes a block preceding a present block by one or more blocks;

a unit which obtains main spindle stop time between a non-cutting block and start of feed for cutting and acceleration/deceleration time of the main spindle on the basis of the result of the pre-reading and analysis when a result of the pre-reading and analysis shows that it is during the main spindle revolution instruction and a non-cutting block exists; and

a main spindle stop timing calculating unit which compares said main spindle stop time with the acceleration/deceleration time of said main spindle obtained by the unit and, when the former is longer the latter, stops the main spindle even during the main spindle revolution instruction.

20. A numerical control method comprising the steps of preliminarily reading and analyzing a block preceding a present block by one or more blocks and controlling a timing of starting a peripheral speed uniforming control function and a timing of starting a main spindle on the basis of a result of the pre-reading and analysis.

21. A numerical control method comprising the steps of:

preliminarily reading and analyzing a block preceding a present block by one or more blocks;

on the basis of a result of the pre-reading and analysis, obtaining first execution time since a peripheral speed uniforming instruction is given until feed for cutting is started, main spindle reach time required to make speed of a main spindle before the peripheral speed uniforming instruction reach the speed of the main spindle at the start of cutting according to the peripheral speed uniforming instruction, second execution time since a main spindle revolution instruction is given until feed for cutting is started, and main spindle acceleration time since the main spindle is started until the speed of the main spindle at the start of cutting according to the main spindle revolution instruction is reached; and

starting the peripheral speed uniforming control function after elapse of time obtained by subtracting the main spindle reach time from the first execution time since the peripheral speed uniforming instruction, and starting said main spindle after time obtained by subtracting the main spindle acceleration time from the second execution time elapses since the main spindle revolution instruction.

22. A numerically controlled apparatus comprising:

a program pre-reading and analyzing unit which preliminarily reads and analyzes a block preceding a present block by one or more blocks;

a peripheral speed uniforming control function start timing calculating unit which controls a timing of starting a peripheral speed uniforming control function on the basis of a result of the pre-reading and analysis of the program pre-reading and analyzing unit; and

a main spindle start timing calculating unit which controls a timing of starting the main spindle on the basis of a result of pre-reading and analysis of the program pre-reading and analyzing unit.

23. A numerically controlled apparatus comprising:

a program pre-reading and analyzing unit which preliminarily reads and analyzes a block preceding a present block by one or more blocks;

a unit which obtains, on the basis of a result of pre-reading and analysis of the program pre-reading and analyzing unit, first execution time since a peripheral speed uniforming instruction is given until feed for cutting is started, main spindle reach time required to make speed of a main spindle before the peripheral speed uniforming instruction reach the speed of the main spindle at the start of cutting according to the peripheral speed uniforming instruction, second execution time since a main spindle revolution instruction is given until feed for cutting is started, and main spindle acceleration time required to reach the speed of the main spindle according to the main spindle revolution instruction from start of the main spindle;

a peripheral speed uniforming control function start timing calculating unit which starts the peripheral speed uniforming control function after elapse of time obtained by subtracting the main spindle reach time from the first execution time since the peripheral speed uniforming instruction; and

a main spindle start timing calculating unit which starts the main spindle after time obtained by subtracting the main spindle acceleration time from the second execution time elapses since the main spindle revolution instruction.

24. A numerical control method comprising the steps of:

preliminarily reading and analyzing a block preceding a present block by one or more blocks;

controlling a timing of starting a peripheral speed uniforming control function on the basis of a result of the pre-reading and analysis; and

stopping a main spindle even during a main spindle revolution instruction when the result of pre-reading and analysis satisfies a predetermined condition.

25. A numerical control method comprising the steps of:

preliminarily reading a block preceding a present block by one or more blocks;

on the basis of a result of the pre-reading and analysis, obtaining first execution time since a peripheral speed uniforming instruction is given until feed for cutting is started and main spindle reach time required to make speed of a main spindle before the peripheral speed uniforming instruction reach the speed of the main spindle at the start of cutting operation according to the peripheral speed uniforming instruction;

when a result of the pre-reading and analysis shows that it is during the main spindle revolution instruction and a non-cutting block exists, on the basis of a result of the pre-reading and analysis, obtaining main spindle stop time between the non-cutting block and start of feed for cutting and acceleration/deceleration time of the main spindle;

starting the peripheral speed uniforming control function after time obtained by subtracting the main spindle reach time from the first execution time elapses since the peripheral speed uniforming instruction;

comparing the main spindle stop time with the acceleration/deceleration time of the main spindle; and

when the main spindle stop time is longer than the acceleration/deceleration time of the main spindle, stopping the main spindle even during the main spindle revolution instruction.

26. A numerically controlled apparatus comprising:

a program pre-reading and analyzing unit which preliminarily reads and analyzes a block preceding a present block by one or more blocks;

a peripheral speed uniforming control function start timing calculating unit which controls a timing of starting a peripheral speed uniforming control function on the basis of a result pre-reading and analysis of the program pre-reading and analyzing unit; and

a main spindle stop timing calculating unit which stops a main spindle even during a main spindle resolution instruction when the result of pre-reading and analysis of the program pre-reading and analysis unit satisfies a predetermined condition.

27. A numerically controlled apparatus comprising:

a program pre-reading and analyzing unit which preliminarily reads and analyzes a block preceding a present block by one or more blocks;

a unit which obtains, on the basis of a result of pre-reading and analysis of the program pre-reading and analyzing unit, first execution time since a peripheral speed uniforming instruction is given until feed for cutting is started and main spindle reach time required to make speed of a main spindle before the peripheral speed uniforming instruction reach the speed of the main spindle at the start of cutting according to the peripheral speed uniforming instruction;

a unit which obtains main spindle stop time between a non-cutting block and start of feed for cutting and acceleration/deceleration time of the main spindle on the basis of a result of the pre-reading and analysis of the program pre-reading and analyzing unit when the result of the pre-reading and analysis shows that it is during a main spindle revolution instruction and the non-cutting block exists;

a peripheral speed uniforming control function start timing calculating unit which starts the peripheral speed uniforming control function after elapse of time obtained by subtracting the main spindle reach time from the first execution time since the peripheral speed uniforming instruction; and

a main spindle stop timing calculating unit which compares the main spindle stop time and the acceleration/deceleration time of the main spindle obtained by the unit with each other and, when the former is longer than the latter, stops the main spindle even in the main spindle revolution instruction.

28. A numerical control method comprising the steps of:

preliminarily reading and analyzing a block preceding a present block by one or more blocks;

controlling a timing of starting a main spindle on the basis of a result of the pre-reading and analysis; and

stopping the main spindle even during a main spindle revolution instruction when the result of pre-reading and analysis satisfies a predetermined condition.

29. A numerical control method comprising the steps of:

preliminarily reading a block preceding a present block by one or more blocks;

on the basis of a result of the pre-reading and analysis, obtaining second execution time since a main spindle instruction is given until feed for cutting is started and main spindle acceleration time since start of the main spindle until speed of the main spindle according to the main spindle revolution instruction is reached;

when the result of the pre-reading and analysis shows that it is during the main spindle revolution instruction and a non-cutting block exists, on the basis of the result of the pre-reading and analysis, obtaining main spindle stop time between the non-cutting block and start of feed for cutting and acceleration/deceleration time of the main spindle;

starting the main spindle after time obtained by subtracting the acceleration time of the main spindle from the second execution time elapses since the main spindle revolution instruction;

comparing the main spindle stop time with the acceleration/deceleration time of the main spindle; and

when the main spindle stop time is longer than the acceleration/deceleration time of the main spindle, stopping the main spindle even during the main spindle revolution instruction.

30. A numerically controlled apparatus comprising:

a program pre-reading and analyzing unit which preliminarily reads and analyzes a block preceding a present block by one or more blocks;

a main spindle start timing calculating unit which controls a timing of starting a main spindle on the basis of a result of pre-reading and analysis of the program pre-reading and analyzing unit; and

a main spindle stop timing calculating unit which stops a main spindle even during a main spindle resolution instruction when the result of pre-reading and analysis of the program pre-reading and analysis unit satisfies a predetermined condition.

31. A numerically controlled apparatus comprising:

a program pre-reading and analyzing unit which preliminarily reads and analyzes a block preceding a present block by one or more block;

a unit which obtains, on the basis of a result of pre-reading and analysis of the program pre-reading and analyzing unit, second execution time since a peripheral speed uniforming instruction is given until feed for cutting is started and main spindle acceleration time since the main spindle is started until speed of the main spindle according to the main spindle revolution instruction is reached;

a unit, when a result of the pre-reading and analysis shows that it is during the main spindle revolution instruction and a non-cutting block exists, for obtaining main spindle stop time between the non-cutting block and start of feed for cutting and acceleration/deceleration time of the main spindle on the basis of the result of the pre-reading and analysis;

a main spindle start timing calculating unit which starts the main spindle after elapse of time obtained by subtracting the main spindle acceleration time from the second execution time since the main spindle resolution instruction; and

a main spindle stop timing calculating unit which compares the main spindle stop time and the acceleration/deceleration time of the main spindle obtained by the unit and, when the former is longer than the latter, stops the main spindle even during the main spindle revolution instruction.