Control device and control method

• US 10,315,282 B2
• Filed: 04/24/2018
• Issued: 06/11/2019
• Est. Priority Date: 04/25/2017
• Status: Active Grant

• Current Assignee: Fanuc Corporation
• Original Assignee: Fanuc Corporation
• Inventors: Nakahama, Yasuhiro
• Primary Examiner(s): Dunn, Darrin D
• Application Number:
  US15/960,740
• Publication Number:
  US 20180304426A1
• Time in Patent Office: 413 Days
• CPC Class Codes: B23Q 1/64 characterised by the purpose of the movement indexing equipment B23Q16/02
• CPC Class Codes: B23Q 5/32 Feeding working-spindles feeding working-spindle supports B23Q5/34
• CPC Class Codes: G05B 19/00 Programme-control systems
• CPC Class Codes: G05B 19/4163 Adaptive control of feed or cutting velocity without NC B23Q15/12
• CPC Class Codes: G05B 19/4166 Controlling feed or in-feed G05B19/4163 takes precedence

Abstract

A control device for controlling a machine tool so as to drill a workpiece based on a machining program, includes a motor control unit configured to, when drilling the workpiece, control an axis feed motor of the machine tool so that the rotary tool of the machine tool is axially moved by intermittently decelerated feed in which the feed rate of the rotary tool is alternately switched between a first feed rate and a second feed rate that is lower than the first feed rate, under the condition in which the relational equations (1) and (5) are satisfied.

Claims

1. A control device for controlling a machine tool so as to drill a workpiece based on a machining program, wherein the machine tool includes a rotary tool configured to drill the workpiece and an axis feed motor configured to move the rotary tool in an axial direction,

the control device comprising:

a motor control unit controlling the axis feed motor so that the rotary tool is axially moved by intermittently decelerated feed in which a feed rate of the rotary tool is alternately switched between a first feed rate and a second feed rate that is lower than the first feed rate, under a condition in which the following relational equations are satisfied;

2. The control device according to claim 1, further comprising an information determining unit determining, based on predetermined multiple pieces of prescribed information and the relational equations, four pieces of information including information indicating the first feed rate, information indicating the second feed rate, information indicating the first rate moving time, and information indicating the second rate moving time,

wherein the motor control unit controls the axis feed motor based on the four pieces of information so that the rotary tool is axially moved by the intermittently decelerated feed when drilling the workpiece.

3. The control device according to claim 2, wherein the multiple pieces of prescribed information include information indicating a ratio between the first feed rate and the second feed rate and information indicating the first rate moving time or the second rate moving time.

4. The control device according to claim 2, wherein the multiple pieces of prescribed information include information indicating a ratio between the first feed rate and the second feed rate and information indicating a machining distance by which the rotary tool is moved at the first feed rate in one switching cycle or a machining distance by which the rotary tool is moved at the second feed rate in one switching cycle.

5. The control device according to claim 2, wherein at least one of the multiple pieces of prescribed information is given as a parameter separately from the machining program.

6. The control device according to claim 2, wherein at least one of the multiple pieces of prescribed information is given as an argument in the machining program.

7. A control method for controlling a machine tool so as to drill a workpiece based on a machining program, wherein the machine tool includes a rotary tool configured to drill the workpiece and an axis feed motor configured to move the rotary tool in an axial direction,

the control method comprising:

a motor control step of, when drilling the workpiece, controlling the axis feed motor so that the rotary tool is axially moved by intermittently decelerated feed in which a feed rate of the rotary tool is alternately switched between a first feed rate and a second feed rate that is lower than the first feed rate, under a condition in which the following relational equations are satisfied;

8. The control method according to claim 7, further comprising an information determining step of determining, based on predetermined multiple pieces of prescribed information and the relational equations, four pieces of information including information indicating the first feed rate, information indicating the second feed rate, information indicating the first rate moving time, and information indicating the second rate moving time,

wherein the motor control step is configured to control the axis feed motor based on the four pieces of information so that the rotary tool is axially moved by the intermittently decelerated feed when drilling the workpiece.

9. The control method according to claim 8, wherein the multiple pieces of prescribed information include information indicating a ratio between the first feed rate and the second feed rate and information indicating the first rate moving time or the second rate moving time.

10. The control method according to claim 8, wherein the multiple pieces of prescribed information include information indicating a ratio between the first feed rate and the second feed rate and information indicating a machining distance by which the rotary tool is moved at the first feed rate in one switching cycle or a machining distance by which the rotary tool is moved at the second feed rate in one switching cycle.

11. The control method according to claim 8, wherein at least one of the multiple pieces of prescribed information is given as a parameter separately from the machining program.

12. The control method according to claim 8, wherein at least one of the multiple pieces of prescribed information is given as an argument in the machining program.