# US 2018/0046165 A1 · Tool path generating method and tool path generating apparatus

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- Number: US 2018/0046165 A1
- Document ID: US20180046165A1
- Status: Published application
- Kind: A1
- Application number: 15/555,136
- Filed: 2015-03-13
- Published: 2018-02-15
- Earliest claimed: 2015-03-13
- Assignees: Makino Milling Machine Co., Ltd.
- Applicants: Makino Milling Machine Co., Ltd.
- Inventors: Yasunori MASUMIYA; Kyohei SUZUKI; Hiroki KATO
- Web page: https://patentgrep.com/patent/US20180046165A1

## 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
- B23C 3/08: Milling cams, camshafts, or the like
- B23C 3/12: Trimming or finishing edges, e.g. deburring welded corners
- G05B 19/4093: characterised by part programming, e.g. entry of geometrical information as taken from a technical drawing, combining this with machining and material information to obtain control information, named part program, for the NC machine
- B23C 2220/16: Chamferring
- B23C 2220/363: Spiral grooves
- G05B 2219/34088: Chamfer, corner shape calculation
- G05B 2219/35097: Generation of cutter path, offset curve
- 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)
- B23C: MILLING (broaching B23D; broach-milling in making gears B23F; arrangement for copying or controlling B23Q)

## Abstract

This tool path generating method, which generates a tool path for machining a corner section at which a recess section machined in a workpiece intersects with the outer circumferential surface of the workpiece, includes: a step for calculating a virtual traveling direction, which is a movement direction of a point on the rotational axis line of a rotating tool when the recess section is machined; a step for calculating the position of the corner section from the virtual traveling direction and shape data of the workpiece; and a step for generating a tool path for machining along the calculated position of the corner section.

## Claims

### Claim 1

A tool path generating method for generating a tool path for machining a corner part where a recessed part formed in a workpiece and an outer circumferential surface of the workpiece intersect, the tool path generating method comprising steps of:
calculating, as a virtual traveling direction, a direction of movement of a point on a rotational axis of a rotary tool when machining the recessed part;
calculating a position of the corner part from the virtual traveling direction and shape data of the workpiece; and
generating a tool path for machining the workpiece along the calculated position of the corner part.

### Claim 2 (depends on 1)

The tool path generating method according to claim 1, wherein, in the step of generating a tool path for machining the workpiece along the position of the corner part, a path offset from the corner part is found from the calculated virtual traveling direction and the position of the corner part and the offset path is made the tool path machining the corner part.

### Claim 3 (depends on 1)

The tool path generating method according to claim 1, wherein the tool path for machining the workpiece along the position of the corner part is a path of a tool for straight or curved chamfering of the corner part.

### Claim 4 (depends on 1)

The tool path generating method according to claim 1, wherein the workpiece is any of a cylindrical cam, a conical cam, and a roller gear cam, the recessed part is a cam groove, and the tool path of the rotary tool is a locus of a center axis of a cam follower engaging with the cam groove.

### Claim 5

A tool path generating apparatus for generating a tool path for machining a corner part where a recessed part formed in a workpiece and an outer circumferential surface of the workpiece intersect, comprising:
a shape data reading unit for reading a tool path of a rotary tool when machining the recessed part and shape data of the workpiece; and
a path setting unit for finding a position of the corner part from a tool path of the rotary tool when machining the recessed part and shape data of the workpiece and generating a tool path for machining the workpiece along the position of the corner part found.