WO2010044067A1 - Machine d'usinage par jet thermique, à compensation de longueur, et procédé correspondant - Google Patents

Machine d'usinage par jet thermique, à compensation de longueur, et procédé correspondant Download PDF

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Publication number
WO2010044067A1
WO2010044067A1 PCT/IB2009/054523 IB2009054523W WO2010044067A1 WO 2010044067 A1 WO2010044067 A1 WO 2010044067A1 IB 2009054523 W IB2009054523 W IB 2009054523W WO 2010044067 A1 WO2010044067 A1 WO 2010044067A1
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WO
WIPO (PCT)
Prior art keywords
ref
temperature
raw material
machine
workpiece
Prior art date
Application number
PCT/IB2009/054523
Other languages
German (de)
English (en)
Inventor
Christoph Plüss
Guido Wahl
Original Assignee
Bystronic Laser Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bystronic Laser Ag filed Critical Bystronic Laser Ag
Publication of WO2010044067A1 publication Critical patent/WO2010044067A1/fr

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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/03—Observing, e.g. monitoring, the workpiece
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/08—Devices involving relative movement between laser beam and workpiece
    • B23K26/0869—Devices involving movement of the laser head in at least one axial direction
    • B23K26/0876—Devices involving movement of the laser head in at least one axial direction in at least two axial directions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/36—Removing material
    • B23K26/38—Removing material by boring or cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/70—Auxiliary operations or equipment
    • B23K26/702—Auxiliary equipment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
    • B23K37/02—Carriages for supporting the welding or cutting element
    • B23K37/0211—Carriages for supporting the welding or cutting element travelling on a guide member, e.g. rail, track
    • B23K37/0235—Carriages for supporting the welding or cutting element travelling on a guide member, e.g. rail, track the guide member forming part of a portal
    • 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
    • B23Q15/00—Automatic control or regulation of feed movement, cutting velocity or position of tool or work
    • B23Q15/007—Automatic control or regulation of feed movement, cutting velocity or position of tool or work while the tool acts upon the workpiece
    • B23Q15/18—Compensation of tool-deflection due to temperature or force
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
    • G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
    • G01B21/04—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness by measuring coordinates of points
    • G01B21/045—Correction of measurements

Definitions

  • the invention relates to a machine tool for separating a workpiece from a raw material, wherein at least a desired dimension of the workpiece is in electronic form and the machine tool comprises a processing head movable relative to the raw material.
  • the invention relates to a method for cutting out a workpiece from a raw material with the aid of a machine tool with a machining head movable relative to the raw material, wherein at least one desired dimension of the workpiece is in electronic form.
  • the resolution of a machine tool, with which a workpiece is produced is a parameter that influences the dimensional accuracy of the workpiece.
  • An additional influencing parameter is the temperature at which a workpiece is made. The higher the temperature of the machine, the more it expands. At the same dimensions as digital setpoints in a machine, the workpiece is cold Machine smaller than with a warm machine.
  • DE 1922 643 discloses a machine tool in which the temperature at the machine is measured and used to scale the process paths.
  • WO 03/051575 A1 discloses a method for achieving a desired repeatability of an industrial robot comprising at least one arm with a drive, which arm is heated by the energy of the drive and thus expands. The temperature is measured on the robot and used for temperature compensation of the process paths.
  • the object underlying the present invention is now to provide a machine tool and a method, which or which allow the production of a workpiece whose actual mass correspond more closely to its target masses, than was previously possible.
  • this object is achieved by a machine tool having the features of patent claim 1 and / or by a method having the features of patent claim 10.
  • a first temperature sensor for measuring the temperature of at least one machine part of the machine tool, via which the machining head is movable relative to the raw material, and / or a second temperature sensor for measuring the Temperature of the raw material and / or a third temperature sensor for measuring the ambient temperature, and -) providing means for correcting the at least one desired value using the measured temperature or the measured temperatures, a coefficient of expansion of the raw material and an expansion coefficient of the machine part.
  • the invention makes it possible to take into account different expansions of workpiece and machine.
  • the temperature of at least part of the machine and / or the temperature of the raw material and / or the ambient temperature is measured.
  • Raw material from which the workpiece is cut, and with known expansion behavior of the machine these different dimensions can be determined and the target mass be corrected accordingly. If the machine expands more strongly than the raw material, the digitally present nominal dimensions of the workpiece are reduced slightly, so that the greater extent of the machine compared to the raw material is taken into account and ultimately a workpiece is obtained, the actual mass largely correspond to the target masses. The accuracy can be increased despite the different dimensions of the machine and raw material sometimes up to the resolution limit of the machine tool.
  • a machine tool often consists of a plurality of materials so that the expansion behavior compared to the raw material is difficult to calculate. For example, this can be done with the finite element method (FEM). But also empirical tests, that is measurements for the expansion behavior of the machine can serve as a basis for the correction of the desired mass of the workpiece. It should be noted that the machine often will not expand equally in all dimensions or, more precisely, not in all axes of motion. Even inhomogeneities of the raw material to be processed, ie different expansion in the x-, y- and z-direction are conceivable. Advantageously, therefore, for each axis of the robot or the machine tool, a separate correction of the desired mass will take place, which differs from the other axes.
  • FEM finite element method
  • a first temperature sensor and a second temperature sensor and means for correcting the at least one desired dimension are provided with the aid of the measured temperatures, an expansion coefficient of the raw material and an expansion coefficient of the machine part.
  • the temperature of the raw material and the machine tool Therefore, the dimensions of these can be determined very precisely.
  • the second temperature sensor is designed as an infrared sensor. While temperature measurement on machine tool components is relatively easy to accomplish, temperature measurement on the raw material is a major challenge in two ways. On the one hand, the raw material is changed frequently, making the use of a contact temperature sensor cumbersome, on the other hand, the raw material sometimes becomes very strong heated, which is why the use of high temperature sensors is required. Both requirements are well met by an infrared sensor, as it works first contactless - which makes it unnecessary to connect and disconnect a contact sensor - and secondly can be used for high temperatures.
  • thermosensors measure - unless they are infrared sensors with a large detection angle - the temperatures only locally, which is why different temperature distributions are not detected by a single sensor. For this reason, it is proposed to provide a plurality of sensors whose average or weighted average is used for the inventive length compensation. It is advantageous if the means for the correction for the multiplication of the at least one desired dimension with the scaling factor
  • an ambient temperature is ..
  • a machine with a machining head which is moved with three mutually orthogonally disposed carriage eg portal robot
  • three mutually orthogonally disposed carriage eg portal robot
  • a scaling of the target dimensions in several axes affect. It is conceivable for simplicity, only the temperature of the machine T x , only the temperature of the raw material T M or only the ambient temperature T 1 , to measure. However, it is advantageous to measure both the temperature of the machine T x and the temperature of the raw material T M.
  • Scaling factor here is a difference in length, which is due to the different extent of raw material and machine tool, added to a nominal dimension (or subtracted from it).
  • an expansion coefficient of the raw material and a coefficient of expansion of the machine part is provided .
  • Components are sometimes at very high operating temperatures, about a few hundred degrees, used. If several components are to interact, a corresponding clearance at room temperature has to be considered.
  • the desired dimensions of the workpiece can also be related to its subsequent use temperature. A part that is used, for example, ultimately at higher temperatures is therefore cut correspondingly smaller.
  • this embodiment can also be applied independently of the measurement of a temperature when the temperature during the separation process is known or estimated.
  • a temperature of about 20 ° C-25 ° C
  • the thermal separation - in particular by means of laser - the temperature may be higher to set.
  • the later operating temperature differs greatly from the production temperature (eg 500 ° C. compared to 20 ° C.)
  • inaccuracies in the temperature estimation play less of a role.
  • ⁇ x _D x ( ⁇ ref ) [( ⁇ M ( ⁇ M - ⁇ ref ) - ⁇ x ( ⁇ x - ⁇ ref )] / ⁇ [i + ⁇ x ( ⁇ x - ⁇ ref )] • [i + ⁇ M ( ⁇ B - ⁇ ref )] ⁇ are provided for the at least one desired dimension. This is an alternative to the above-mentioned method for correcting the target mass of a workpiece.
  • Embodiments and advantages of the inventive machine tool relate equally to the inventive method and vice versa.
  • correction means may be implemented in software and / or hardware, for example as part of the control software of the machine tool or as an integrated circuit, for example in the form of an ASIC (Application Specific Integrated Circuit). While in the case of a hardware implementation, the means should rather be seen as a physical unit, in the case of implementation in software, an interpretation rather than a functional unit will be considered.
  • ASIC Application Specific Integrated Circuit
  • the invention relates to all types of machine tools, such as, for example, water jet cutting machines, saws, shears, punches, nibbling machines, milling machines, lathes and the like.
  • the invention is particularly advantageous with respect to machines in which the cutting out of a workpiece is not performed mechanically but thermally, ie, for example, on flame cutting machines, plasma cutting machines and, in particular, laser cutting machines.
  • Fig. 1 is a symbolic laser cutting machine
  • Fig. 2 is a schematic of the length measurement in machine tools
  • Fig. 3 is a diagram showing the expansions of
  • FIG. 1 symbolically shows a variant of a machine tool 1 according to the invention, which cuts out a workpiece from a raw material 2 consisting of two guide rails 3 in the y direction (referred to as “y guide rails” in succession), two slides 4 guided on the guide slides 3 an attached guide rail 5 in the x-direction (hereinafter referred to as "x- guide rails") and a displaceable on the x-guide rail 5 machining head 6, which (not shown), that for example a laser, includes the cutting device.
  • x- guide rails a displaceable on the x-guide rail 5 machining head 6, which (not shown), that for example a laser, includes the cutting device.
  • the temperature sensors 7a..7c and 8y..8c are fixed to the Machine tool 1 installed, for example glued or screwed. It is important to ensure good temperature transition between the component to be measured and the sensor 7a..7c and 8a..8c, for example by using a thermal paste.
  • the machine tool 1 comprises an infrared temperature sensor 9 ("IR sensor" for short), which measures the temperature of the raw material 2 without contact, of course, Figure 1.
  • IR sensor infrared temperature sensor
  • the machine tool 1 is shown only in stylized form, and usually such a machine 1 has additional components
  • the machine tool 1 is suitable only for cutting flat workpieces, but of course the invention also relates to three-dimensional cutting operations.
  • FIG. 2 symbolically shows a ruler 10 of the machine tool 1, the machining head 6, as well as a workpiece 11.
  • the ruler 10 has the temperature T x and the workpiece 11 the temperature T M.
  • the workpiece 11 is also shown at a temperature T B (dotted line).
  • Figure 2 also shows 3 different positions of
  • FIG. 3 shows the expansion behavior of machine tool 1 and raw material 2.
  • the temperature T is shown on the horizontal axis, and the process path of the machine tool 1 or the expansion of the raw material 2 in the x direction on the vertical axis.
  • the machine tool 1 expands with the expansion coefficient CC x (dashed line), the Raw material 2 with the coefficient of expansion ⁇ M.
  • the temperatures T re f, T x , T M and T B already mentioned for FIG. 2 as well as the assigned positions / lengths x (T re f), x (T x ), x (T M ) and x are (T B ) shown ..
  • Machine tool 1 are present, wherein for the sake of simplicity, only the expansion in the x direction is taken into account.
  • the workpiece 11 is to be used later at an operating temperature T B and thereby have a length X ⁇ TB ).
  • T B the temperature of the raw material 2 from which the workpiece 11 is to be cut is determined.
  • T M is measured. Because of the (normally positive) expansion coefficient of the raw material CC M and because the temperature T B is higher than the temperature T M , the workpiece 11 is shorter at the temperature T M and has a length of only x (T M ). This means that the workpiece 11 has to be cut at the position x (T M ) so that it has the length x (T B ) at the operating temperature.
  • T re f indicates the temperature at which the machine tool 1 has absolute accuracy, that is, an electronically predetermined measure of 10 cm also leads to a process path of actually 10 cm. At this temperature, the machine 1 would - apart from play in the drives, measurement inaccuracies, etc. - so produce absolutely accurate workpieces 11.
  • x (T ref ) indicates a target dimension at the temperature Tref
  • x (T x ) the target dimension when the machine 1, more specifically those machine parts which influence the process path of the machining head 6 in the x-direction (here the x Guide rail 5), with the expansion coefficient CC x in the x direction on the
  • Heat temperature T x and x (T M ) indicates the target size, when the raw material 2 with the expansion coefficient CC M in the x-direction to the temperature T M heats.
  • Wanted is now the factor C x , with which the target mass x (T re f) must be multiplied, so that the different longitudinal extent of machine and raw material is compensated.
  • T ref target mass of a workpiece x
  • Temperatures is used and should have the desired dimension in this state, then they must be multiplied setpoint x (T ref ) with another factor C XTB .
  • Machine tool 1 and the later operating temperature T B of the workpiece 11 taken into account.
  • a correction value can also be added to it. It applies
  • ⁇ x (T x ) represents the difference in length between raw material 2 and machine tool 1 at the temperature T x . This must, before it can be added to the target masses x (T ref) related to the reference temperature T ref, giving Ax (T re f) results. If exact mass is desired for a later operating temperature T B , then ..
  • Machine tool T x advantageous but not necessary for simplified procedures.
  • the formulas given simplify in part, since T x can be equated with T M or T 1 , respectively. If several sensors are used for temperature measurement, for example on an axis of the machine tool 1, then in the formulas the mean value or, if sections of the machine tool 1 expand differently in one direction, a weighted mean value is to be used. Optionally, if different materials are used for the machine tool 1, the expansion can also be calculated in sections. Finally, it is also conceivable to scale the target mass only in one direction, eg in the x direction. This is particularly practicable if this axis is relatively long compared to the other axes of the machine tool 1 and there are thermally induced deviations particularly strong, in contrast, hardly affect the other axes.
  • the desired mass is first corrected as such and then a digitization of the data, that is to say a conversion of the desired mass into incremental steps of the machine tool 1, takes place.
  • a digitization of the data that is to say a conversion of the desired mass into incremental steps of the machine tool 1
  • the correction of the already digitized target data is possible, however, due to the discrete steps additional inaccuracies may result.
  • T B Operating temperature of the workpiece 11 x (T re f) setpoint at reference temperature T re fx (T M ) setpoint at temperature of the raw material T M X (T x ) setpoint at temperature of the x-axis of the

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Engineering (AREA)
  • Plasma & Fusion (AREA)
  • General Physics & Mathematics (AREA)
  • Automatic Control Of Machine Tools (AREA)
  • Laser Beam Processing (AREA)

Abstract

L'invention concerne une machine-outil (1) et un procédé de séparation d'une pièce (11) d'un matériau brut (2), au moins une cote nominale (x(Tref)) de la pièce (11) se présentant sous forme électronique, ladite machine-outil (1) comprenant une tête d'usinage (6) mobile par rapport au matériau brut (11). On mesure une première température (T x ) d'au moins une partie (3, 5) de la machine-outil (1), via laquelle la tête d'usinage (6) peut être déplacée par rapport au matériau brut (2) et/ou une seconde température (T M) du matériau brut (2) et/ou une température ambiante (T U ). A l'aide de la température mesurée ou des températures mesurées (T x, TM, TU), d'un coefficient de dilatation (ax) du matériau brut (2) et d'un coefficient de dilatation (ax) de ladite partie (3, 5) de machine, au moins une cote nominale (x(Tref)) est ensuite corrigée.
PCT/IB2009/054523 2008-10-14 2009-10-14 Machine d'usinage par jet thermique, à compensation de longueur, et procédé correspondant WO2010044067A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH16942008 2008-10-14
CH1694/2008 2008-10-14

Publications (1)

Publication Number Publication Date
WO2010044067A1 true WO2010044067A1 (fr) 2010-04-22

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105397560A (zh) * 2015-12-22 2016-03-16 重庆大学 一种干切数控滚齿机床及工件热变形误差补偿方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3142120A (en) * 1961-09-30 1964-07-28 Genevoise Instr Physique Measuring machine or precision machine tool
EP0546784A2 (fr) * 1991-12-11 1993-06-16 Renishaw Metrology Limited Capteur de température pour un appareil de positionnement des coordonnées
DE19800033A1 (de) * 1998-01-02 1999-07-15 Elb Schliff Werkzeugmaschinen Verfahren zum Kompensieren von temperaturabhängigen Lageänderungen an Werkzeugmaschinen und Werkzeugmaschine hierfür
EP1128156A1 (fr) * 2000-02-10 2001-08-29 General Electric Company Procédé et dispositif de compensation automatique d'erreurs de mesure
WO2008044256A1 (fr) * 2006-10-09 2008-04-17 Ce.S.I. Centro Studi Industriali Di Taddei Ing. Franco & C. S.A.S. Contrôle thermique d'une machine de commande par un système destiné à stocker l'énergie thermique à l'aide de matériaux eutectiques

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3142120A (en) * 1961-09-30 1964-07-28 Genevoise Instr Physique Measuring machine or precision machine tool
EP0546784A2 (fr) * 1991-12-11 1993-06-16 Renishaw Metrology Limited Capteur de température pour un appareil de positionnement des coordonnées
DE19800033A1 (de) * 1998-01-02 1999-07-15 Elb Schliff Werkzeugmaschinen Verfahren zum Kompensieren von temperaturabhängigen Lageänderungen an Werkzeugmaschinen und Werkzeugmaschine hierfür
EP1128156A1 (fr) * 2000-02-10 2001-08-29 General Electric Company Procédé et dispositif de compensation automatique d'erreurs de mesure
WO2008044256A1 (fr) * 2006-10-09 2008-04-17 Ce.S.I. Centro Studi Industriali Di Taddei Ing. Franco & C. S.A.S. Contrôle thermique d'une machine de commande par un système destiné à stocker l'énergie thermique à l'aide de matériaux eutectiques

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105397560A (zh) * 2015-12-22 2016-03-16 重庆大学 一种干切数控滚齿机床及工件热变形误差补偿方法

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