Numerical control apparatus

• US 5,172,040 A
• Filed: 02/04/1991
• Issued: 12/15/1992
• Est. Priority Date: 06/29/1989
• Status: Expired due to Fees

• Current Assignee: Fanuc Ltd (Fanuc Corporation)
• Original Assignee: Fanuc Ltd (Fanuc Corporation)
• Inventors: Sasaki, Takao, Fujibayashi, Kentaro, Kozai, Haruhiko
• Primary Examiner(s): IP, SHIK LUEN PAUL
• Application Number:
  US07/646,716
• Time in Patent Office: 680 Days
• Field of Search: 318/560-646, 364/474.01-474.3, 51/5 D, 51/35, 51/43, 51/165 TP, 51/DIG. 14
• US Class Current: 318/571
• CPC Class Codes: G05B 19/40937 concerning programming of machining or material parameters, pocket machining
• CPC Class Codes: G05B 2219/36091 Modification, override as function of conditions, distance
• CPC Class Codes: G05B 2219/36256 Define upper lower limit of reciprocating machining, chopping
• CPC Class Codes: G05B 2219/45161 Grinding machine
• CPC Class Codes: G05B 2219/49382 Movement reciprocating
• CPC Class Codes: Y02P 90/02 Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]

Abstract

Disclosed is a numerical control apparatus for controlling a chopping operation of a tool used in a grinding machine and the like. A programmed instruction value calculation circuit (2) outputs an upper dead point instruction (Zu) and a lower dead point instruction (Zl), a correction value calculation circuit (3) calculates and outputs correction values (ΔZu, ΔZl), and a chopping instruction calculation circuit (4) outputs a chopping control output to a manual control circuit (6) based on these instructions and correction values to operate a servo motor. When an instruction value (Zi) is input from a manual pulse generator (5) to the chopping instruction calculation circuit (4), the chopping is effected while continuously changing the upper and lower dead points, thereby enabling an operator to easily adjust the upper and lower dead points.

Claims

1. A numerical control apparatus for controlling a chopping operation of a tool having a chopping axis including upper and lower dead points, and used in a grinding machine, comprising:

instruction value output means for generating and outputting predetermined instruction values in response to an external command;

instruction value calculation means for receiving said predetermined instruction values from said instruction value output means and performing a necessary correcting calculation generating a lower instruction value indicating the lower dead point and an upper instruction value indicating the upper dead point of the chopping axis output by a program, and generating corrected instruction values by adding said predetermined instruction values to the upper and lower instruction values; and

axis control means for receiving said corrected instruction values output from said instruction value calculation means and controlling said chopping axis based on the corrected instruction values.

2. A numerical control apparatus according to claim 1, wherein said correcting calculation corrects an insufficient amount of movement of said chopping axis with respect to the upper and lower instruction values output by said program.

3. A numerical control apparatus according to claim 1, wherein said instruction value output means comprises a manual pulse generator.