Method and device for controlling a tool feed

• US 6,629,017 B1
• Filed: 05/02/2000
• Issued: 09/30/2003
• Est. Priority Date: 06/12/1997
• Status: Expired due to Term

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Speth, Wolfgang, Westermeyer, Wilhelm
• Primary Examiner(s): Picard, Leo
• Assistant Examiner(s): Bahta, Kidest
• Application Number:
  US09/445,359
• Time in Patent Office: 1,246 Days
• Field of Search: 700/188, 700/146, 700/170, 700/169, 700/160, 700/164, 700/174
• US Class Current: 700/169
• CPC Class Codes: G05B 19/4103 Digital interpolation

Abstract

A tool feeding speed profile is directly programmable, feeding speed minimums across the control blocks being used in advance in the event that the admissible axis dynamics are exceeded by the predefined feeding speed profile. The tool feeding speed profile can be programmed, in particular, as a linear, polynomial, or cubic feeding speed profile, the latter being predefinable over a sequence of control blocks as a feeding speed polynomial or a feeding speed spline by interpolation or approximation.

Claims

1. A method of controlling a tool feed speed, the feed speed being controlled via control blocks, the method comprising:

directly programming a profile of the feed speed, the profile of the feed speed being directly programmed over at least one of the control blocks as at least one of a polynomial, a spline, and a linear feeding profile; and

if admissible axis dynamics are exceed by the profile, using feeding speed minimums in advance across the control blocks.

2. The method according to claim 1, further comprising:

defining desired tool feeding speed values as interpolation points of at least one of the polynomial and the spline at each control block transition via a predictor algorithm, the tool feeding speed values being connected by one of an interpolating polynomial and interpolating spline.

3. The method according to claim 1, further comprising:

defining desired tool feeding speed values as interpolation points of at least one of the polynomial and the spline at each control block transition via a predictor algorithm, the tool feeding speed values being connected by one of an approximating polynomial and an approximating spline.

4. The method according to claim 1, further comprising:

entering the profile with the admissible axis being observed and with smoothing of the feeding speed control.

5. The method according to claim 1, further comprising:

in an event of one of;

i) a jump in the feeding speed, and ii) changes in a feeding speed override value, activating smoothing of feeding speed control.

6. The method according to claim 1, further comprising:

performing one of;

i) compensating, and ii) disabling smoothing of the profile.

7. The method according to claim 1, wherein the tool speed is for one of i) a numerically controlled machine tool and ii) a robot.

8. A device for controlling a tool feed speed, comprising:

control blocks for controlling the tool feed speed; and

an arrangement for directly programming a profile of the feed speed, the profile of the feed speed being directly programmed over at least one of the control blocks as at least one of a polynomial, a spline, and a linear feeding profile, wherein if admissible axis dynamics are exceed by the profile, feeding speed minimums are used in advance across the control blocks.

9. The device according to claim 8, wherein the tool feed speed is for one of:

i) a numerically controlled machine tool, and ii) a robot.