# US 10,514,674 B2 · Numerical controller

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- Number: US 10,514,674 B2
- Document ID: US10514674B2
- Status: Granted
- Kind: B2
- Application number: 16/039,577
- Filed: 2018-07-19
- Published: 2019-01-31
- Granted: 2019-12-24
- Earliest claimed: 2017-07-26
- Assignees: Fanuc Corporation
- Applicants: Fanuc Corporation
- Inventors: Takashi Satou; Takeshi Mochida
- Web page: https://patentgrep.com/patent/US10514674B2

## CPC

- G05B 19/19: characterised by positioning or contouring control systems, e.g. to control position from one programmed point to another or to control movement along a programmed continuous path
- B21D 28/26: in sheets or flat parts
- B21D 28/265: {with relative movement of sheet and tools enabling the punching of holes in predetermined locations of the sheet, e.g. holes punching with template}
- G05B 19/188: {characterised by special applications and not provided for in the relevant subclasses, (e.g. making dies, filament winding)}
- G05B 19/4103: Digital interpolation
- G05B 2219/34083: Interpolation general
- G05B 2219/43163: Based on unit motions, primitive b-spline motions, time shifted and weighted
- G05B 2219/45137: Punch, stamp, also with use die, mould
- G05B: CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS (systems for controlling or regulating non-electric variables G05D; systems for regulating electric or magnetic variables G05F; control devices or systems insofar as characterised by mechanical features only G05G)
- B21D: WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL (working or processing of wire B21F)

## Abstract

A numerical controller generates movement command data, and performs an interpolation process based on the generated movement command data to generate and output interpolation data. Further, in the case of a state in which a press operation in punch press machining is started from a different position from a position of a preset rising edge, an overlap time is calculated based on a position of a punch head when the press operation is started, and an output timing of interpolation data related to an axis controlling the press operation is controlled based on the calculated overlap time. In this way, even when there is a change in press stroke, a dead time may be prevented from being generated.

## Claims

### Claim 1

A numerical controller for controlling, based on a program, a machine tool that performs punch press machining on a workpiece using a tool attached to a punch head, the numerical controller comprising:
a command analysis unit that generates movement command data by reading and analyzing a command block from the program, and outputs the generated movement command data;
an interpolation unit that performs an interpolation process based on the movement command data to generate interpolation data and outputs the generated interpolation data; and
an overlap time calculation unit that calculates, in a case in which press operation in the punch press machining is started from a position different from a position of a rising edge set in advance, an overlap time according to the position of the punch head at the time when the press operation is started,
wherein the interpolation unit controls an output timing of interpolation data related to an axis controlling the press operation based on an overlap time calculated by the overlap time calculation unit.

### Claim 2 (depends on 1)

The numerical controller according to claim 1, wherein the overlap time calculation unit is configured to calculate the overlap time such that a dead time is not generated between a timing at which the tool moves to a punch point of the workpiece and a timing at which the tool comes into contact with an upper surface of the workpiece by the press operation.