Thread cutting control method and thread cutting controller
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsYuji Mizukami, Hiroshi Hashimoto
Life of this patent
Estimating the term…
Abstract
In a threading control system for performing a threading operation by moving, in synchronization with rotation of the main-spindle, either a cutter or a workpiece in the feeding spindle direction so that the ridge is not damaged nor the dimensional accuracy of the thread is lowered even if the main-spindle speed is variable, a threading computing section 3 and a main-spindle angle computing section 4 are provided to alter the threading start timing based on the servo-spindle acceleration time-constant of the feeding spindle.
Claims29
1-12. (canceled)
A threading control method for performing a threading operation
- by moving, in synchronization with rotation of a main spindle, either a cutter or a workpiece in a feeding spindle direction, characterized in that
- threading start timing is altered based on at least a servo-spindle acceleration time-constant for the feeding spindle, in a situation in which the identical workpiece is threaded either at a feed rate different from a previous feed rate, or on a machine different from a previously used machine.
A threading control method for performing a threading operation by moving, in synchronization with rotation of a main spindle, either a cutter or a workpiece in a feeding spindle direction, the method comprising:
- a step of outputting a thread-pitch command value and a programmed main-spindle rotation frequency by means of a machining program,
- a step of calculating a first servo feed rate based on the thread-pitch command value and the programmed main-spindle rotation frequency,
- a step of calculating a second servo feed rate based on the thread-pitch command value, the programmed main-spindle rotation frequency and a main-spindle override input from outside,
- a step of calculating a main-spindle threading-start timing shift based on the first servo feed rate, the second servo feed rate and a servo-spindle acceleration time-constant for the feeding spindle in a situation in which the identical workpiece is threaded either at a feed rate different from a previous feed rate, or on a machine different from a previously used machine,
- a step of altering the threading-start timing by the main-spindle threading-start timing shift.
A threading control system for performing a threading operation by moving, in synchronization with rotation of a main spindle, either a cutter or a workpiece in a feeding spindle direction,
- characterized in that
- a main-spindle angle computing section altering threading start timing, based on a servo-spindle acceleration time-constant for the feeding spindle, in a situation in which the identical workpiece is threaded either at a feed rate different from a previous feed rate, or on a machine different from a previously used machine.
A threading control system for performing a threading operation by moving, in synchronization with rotation of a main spindle, either a cutter or a workpiece in a feeding spindle direction, the system comprising:
- a machining program analyzing section outputting a thread-pitch command value and a programmed main-spindle rotation frequency by means of a machining program,
- a threading computing section calculating a first servo feed rate based on the thread-pitch command value and the programmed main-spindle rotation frequency,
- and calculating a second servo feed rate based on the thread-pitch command value and the programmed main-spindle rotation frequency and a override input from outside,
- a machining program analyzing section outputting a thread-pitch command value and a programmed main-spindle rotation frequency based on a machining program.
- a threading computing section calculating a first servo feed rate based on the thread-pitch command value and the programmed main-spindle rotation frequency,
- and calculating a second servo feed rate based on the thread-pitch command value and the programmed main-spindle rotation frequency and a override input from outside,
- a main-spindle angle computing section calculating a first servo feed rate and a second servo feed rate according to thread-pitch command value and programmed main-spindle rotation frequency, and calculating a main-spindle threading-start timing shift based on the first servo feed rate, the second servo feed rate and a servo-spindle acceleration time-constant for the feeding spindle in a situation in which the identical workpiece is threaded either at a feed rate different from a previous feed rate, or on a machine different from a previously used machine, and altering the threading-start timing by the main-spindle threading-start timing shift.
Dependencies are inferred from the claim text.