WO2012082543A4 - Method for automatic compensation of thermal distortion in a gantry machine - Google Patents
Method for automatic compensation of thermal distortion in a gantry machine Download PDFInfo
- Publication number
- WO2012082543A4 WO2012082543A4 PCT/US2011/064102 US2011064102W WO2012082543A4 WO 2012082543 A4 WO2012082543 A4 WO 2012082543A4 US 2011064102 W US2011064102 W US 2011064102W WO 2012082543 A4 WO2012082543 A4 WO 2012082543A4
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cross rail
- temperature
- axis
- gantry machining
- bed
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
- B23Q1/01—Frames, beds, pillars or like members; Arrangement of ways
- B23Q1/012—Portals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
- B23Q11/0003—Arrangements for preventing undesired thermal effects on tools or parts of the machine
- B23Q11/0007—Arrangements for preventing undesired thermal effects on tools or parts of the machine by compensating occurring thermal dilations
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Automatic Control Of Machine Tools (AREA)
- Machine Tool Units (AREA)
- Laser Beam Processing (AREA)
Abstract
A method for automatically compensating short-term relative thermal transient deformation of the cross rail of a gantry machining device includes the steps of measuring the horizontal expansion of the cross rail, measuring the horizontal expansion of the bed, and determining the difference between the two measurements to determine a compensation amount.
Claims
1. A method of automatically compensating thermal transient deformation of a cross rail of a gantry machining device having a vertical Z-axis and a bed that extends along the X and Y-axis comprising the steps of:
(a) measuring a temperature of the cross rail of the gantry machining device using one or more sensors located on the cross rail;
(b) calculating a parabolic shape of the cross rail using a processing device based on the measured temperature of the cross rail;
(c) calculating a deflection amount along the Z-axis of the cross rail using the processing device based on the calculated parabolic shape of the cross rail; and
(d) adjusting the height of one or more spindles in the direction of the Z- axis according to the calculated parabolic shape of the cross rail to compensate for the calculated deflection of the cross rail.
2. The method of claim 1 further comprising the steps of:
measuring the cross rail temperature a plurality of times; calculating an average cross rail temperature (Tc) based on the measured cross rail temperatures;
measuring the temperature of the bed (Tb) of a gantry machining device a plurality of times using one or more temperature sensors;
calculating the deflection of the cross rail using the processing device according to the following formula;
Zcopv = (Toe - Tc) * {A1*Y2 + B1*Y + Cl) + (Tob - Tb) * (4 ?*Y2 1- B2*Y +
C2)
where: Ζςοτηρ is a Z-axis compensation as a function of a Y-axis position,
Tc is the average cross rail temperature, Toe is a cross rail temperature standard temperature, Tb is an averaged bed temperature, Tob is a standard bed temperature, Y is a Y-axis location along cross rail, [Al.Bl.Cl] are sensitivity coefficients describing parabolic deformation along Y-axis per deg of cross rail ΔΤ, and [A2,B2,C2] are sensitivity coefficients describing parabolic deformation along the Y- axis per 4eg of bed ΔΤ.
3. The method of claim 1, further comprising the steps of:
measuring an ambient air temperature using one or more temperature sensors; and,
altering the calculated deflection amount based on the measured ambient air temperature.
4. The method of claim 1, ftinher comprising the steps of;
measuring a foundation temperature using one or more temperature sensors; and,
altering the calculated deflection amount based on the measured foundation temperature,
5. The method of claim 1 , further comprising the step of measuring the temperature using temperature sensors at two or more points along the length of the cross rail to compensate tor a non-uniform temperature distribution along the X-axis.
6. The method of claim 1, further comprising the steps of:
measuring a temperature of the bed of the gantry machining device using one or more temperature sensors to determine horizontal expansion of the bed; and,
calculating the deflection of the cross rail along the Z-axis based on the measured temperature of the bed.
7. The method of claim 1, further comprising the steps of:
calculating the deflection amount along the Z-axis of the cross rail using the processing device; and,
adjusting the height of one or more spindles using a numerical control (NC) processor.
8. A method of automatically compensating thermal transient deformation of a cross rail of a gantry machining device having a venical Z-axis and a bed that extends along the X and Y-axis comprising the steps of:
(a) sensing a temperature of the cross rail of the gantry machining device a plurality of times using one or more sensors located on the cross rail; 22
(b) storing the sensed temperatures in a computer-readable medium;
(c) calculating a moving average of the sensed cross rail temperatures using a processing device based on the sensed temperatures stored in the computer-readable medium;
(d) sensing an ambient temperature at a gantry machining device;
(e) calculating a deflection of the cross rail along [[a]] the Z-axis using the processing device based on the calculated moving average of the measured cross rail temperatures, a current cross rail temperature, the sensed ambient temperature, and one or more sensitivity coefficients describing parabolic deformation; and
(f) adjusting a position of one or more spindles according o the calculated deflection of the cross rail.
9. The method of claim 8 further comprising the step of
calculating a percentage of cross rail contribution to the Z-axis deflection using the processing device;
calculating a percentage of ambient temperature contribution to the Z-axis deflection using the processing device;
automatically determining an amount of" deflection along a Z-axis of the cross rail using the processing device during gantry machining device operation based on the following formula:
ZC£>mp = 
* {Al*V2† BJ+Y + CI), where Zcun,p is the Z-axis deflection as a function of a Y-axis position, Nj is the calculated percentage of cross rail contribution, N2 is the calculated percentage of ambient temperature contribution, Tc is the sensed cross rail temperature, ΤΜΛ is the calculated moving average of the sensed cross rail temperatures, Tandem is the sensed ambient temperature, Y is a Y-axis position along the cross rail, and [Al.B Cl] are sensitivity coefficients describing a parabolic deformation along the Y-axis per degree of a composite ΔΤ.
10. The method of claim 8, further comprising the step of measuring temperature using one or more thermocouples that generate a voltage signal- 23
11. The method of claim 8, further comprising the steps of:
calculating the moving average of the sensed cross rail temperatures using a first processing device; and,
operating the gantry machining device using a second processing device.
12. The method of claim 8, further comprising the step of:
adjusting a position of one or more spindles using a numerical control (ISC) processor.
13. The method of claim 8, further comprising the steps of:
measuring a temperature of the bed of the gantry machining device using one or more temperature sensors to determine horizontal expansion of the bed; and,
calculating the deflection of the cross rail along the 2-axis based on the measured temperature of the bed.
14. A method for automatically compensating thermal deformation of the cross rail of a gantry machining device comprising the steps of:
(a) measuring the temperature of a gantry machining device using temperature sensors mounted at one or more points;
(b) measuring one or more dimensions of the gantry machining device at the same time the temperature is measured;
(c) storing the measured temperatures and dimensions in a computer- readable medium;
(d) calculating a change in the measured dimensions of the gantry machining device based on a plurality of stored measured temperatures and dimensions and one or more sensitivity coefficients describing parabolic deformation using a processing device;
(e) determining a position of one or more spindles using an numerical control (NC) processor; and
(f) changing the determined position of the one or more spindles based on the calculated change in the measured dimensions of the gantry machining device. 24
15. The meihod of claim 14 further comprising the step of changing the determined position of the one or more spindles using the following equation:
Zcon.p = ATc * (A*Y2 + B*Y + Q, where ATc is an input temperature change to compensate for venical moiion, Y is a Y-axis location along a cross rait of the gantry machining device, and A. B. and C are sensitivity coefficients describing parabolic deformation along the Y-axis per degree of ΔΤ.
16. The method of claim 14 further comprising the step of changing the determined position of the one or more spindles using the following equation:
Zcomp = ΔΤΒ * (A*Y2 -t- B+Y 1- O, where AT^ is an input temperature change to compensate for net absolute vertical motion, Y is a Y-axis location along the cross rail, and A. B, and C are sensitivity coefficients describing parabolic deformation along the Y-axis per degree of ΔΤ.
17. The meihod of claim 14, further comprising the step of measuring one or more dimensions of ihe gantry machining device using a laser-generating device and a reference surface on the gantry machining device.
18. The meihod of claim 14, further comprising the step of changing the determined position of one or more spindles using the NC processor
19. The method of claim 14, farther comprising the steps of:
measuring a temperature of the bed of the gantry machining device using o e or more temperature sensors to determine horizontal expansion of the bed; and,
calculating the change in measured dimensions based on the measured lemperature of the bed.
STATEMENT UNDER ARTICLE 19 (1)
In response to trie International Search Report and Written Opinion of the International Searching Authority mailed 30 July 2012, please amend the above-identified PCT application pursuant to Anicle 19, as follows.
IN THE CLAIMS
Please amend claims 1-9, 11-14, 16 and 19.
25
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US42270410P | 2010-12-14 | 2010-12-14 | |
| US61/422,704 | 2010-12-14 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| WO2012082543A2 WO2012082543A2 (en) | 2012-06-21 |
| WO2012082543A3 WO2012082543A3 (en) | 2012-12-06 |
| WO2012082543A4 true WO2012082543A4 (en) | 2013-01-31 |
Family
ID=46245291
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US2011/064102 WO2012082543A2 (en) | 2010-12-14 | 2011-12-09 | Method for automatic compensation of thermal distortion in a gantry machine |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2012082543A2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105983883A (en) * | 2016-07-18 | 2016-10-05 | 沈机集团昆明机床股份有限公司 | Thermal deformation compensation mechanism and method for ram main shaft of boring and milling machine |
| US10444643B2 (en) | 2017-03-24 | 2019-10-15 | Nikon Research Corporation Of America | Lithographic thermal distortion compensation with the use of machine learning |
| WO2023144848A1 (en) * | 2022-01-25 | 2023-08-03 | Endico S.R.L. | Apparatus and method for making shaped flat elements |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5894960A (en) * | 1981-11-30 | 1983-06-06 | Shin Nippon Koki Kk | Thermal displacement correction device |
| JP3389417B2 (en) * | 1996-05-29 | 2003-03-24 | 大阪機工株式会社 | How to compensate for lost motion |
| WO2002003025A1 (en) * | 2000-06-30 | 2002-01-10 | Unova Ip Corp. | Method for determining effective coefficient of thermal expansion |
| JP2002036069A (en) * | 2000-07-28 | 2002-02-05 | Okuma Corp | Thermal displacement correction method |
| DE10049718A1 (en) * | 2000-10-07 | 2002-04-18 | Heidenhain Gmbh Dr Johannes | Thermal elongation determination arrangement for machine parts has trimming lines, which can be connected to first metal conductor whose electric resistance is proportional to average temperature of monitored area |
| EP2066166A1 (en) * | 2007-11-30 | 2009-06-03 | Mydata Automation AB | Method for temperature compensation in a positioning system |
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2011
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| Publication number | Publication date |
|---|---|
| WO2012082543A3 (en) | 2012-12-06 |
| WO2012082543A2 (en) | 2012-06-21 |
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