DE102004021866A1 - Control of a machine tool such that the volumetric removal is constant - Google Patents
Control of a machine tool such that the volumetric removal is constant Download PDFInfo
- Publication number
- DE102004021866A1 DE102004021866A1 DE200410021866 DE102004021866A DE102004021866A1 DE 102004021866 A1 DE102004021866 A1 DE 102004021866A1 DE 200410021866 DE200410021866 DE 200410021866 DE 102004021866 A DE102004021866 A DE 102004021866A DE 102004021866 A1 DE102004021866 A1 DE 102004021866A1
- Authority
- DE
- Germany
- Prior art keywords
- removal
- volume
- machine
- path
- function
- Prior art date
- Legal status (The legal status 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 status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
- G05B19/416—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by control of velocity, acceleration or deceleration
- G05B19/4163—Adaptive control of feed or cutting velocity
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C3/00—Milling particular work; Special milling operations; Machines therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2220/00—Details of milling processes
- B23C2220/48—Methods of milling not otherwise provided for
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/45—Nc applications
- G05B2219/45145—Milling
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/49—Nc machine tool, till multiple
- G05B2219/49082—Maintain constant material removal rate
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/49—Nc machine tool, till multiple
- G05B2219/49359—Cylindrical or side milling, tool tangential to surface
Landscapes
- Engineering & Computer Science (AREA)
- Human Computer Interaction (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Mechanical Engineering (AREA)
- Numerical Control (AREA)
Abstract
Description
Die Erfindung bezieht sich auf ein Verfahren zum Steuern einer Maschine zum sukzessiven Abtragen von Material eines Werkstücks sowie auf ein Verfahren zum Ermitteln von Steuerdaten für eine derartige Maschine.The The invention relates to a method for controlling a machine for the successive removal of material of a workpiece as well to a method for determining control data for such Machine.
Bei der spanenden Bearbeitung von Werkstücken, z. B. durch Fräsen, wird in der Regel der Vorschub bzw. die Zustellung des Werkzeugs auf eine konstante Geschwindigkeit eingestellt, um vom Werkstück Material abzutragen. Falls sich entlang eines derartigen Abtragsweges, z. B. der Fräsbahn des Werkzeugs, der Querschnitt des abzutragenden Volumens ändert, ändert sich die Belastung des Werkzeugs. Folglich sollte die einzustellende konstante Zustellgeschwindigkeit auf die größte Belastung ausgerichtet sein, um eine Überlastung des Werkzeugs bzw. der Maschine zu vermeiden, und dies führt andererseits zu einer unrationellen Bearbeitung des Werkstücks und zu unter Umständen erheblichen Lastwechseln am Werkzeug, was die Maschine und das Werkzeug beansprucht.at the machining of workpieces, z. B. by milling is usually the feed or the delivery of the tool set a constant speed to material from the workpiece ablate. If along such Abtragsweges, z. B. the milling path of the tool that changes the cross section of the volume to be removed changes the load of the tool. Consequently, the constant delivery speed aligned to the highest load be an overload of the tool or the machine, and this leads on the other hand to an inefficient machining of the workpiece and possibly considerable Load changes on the tool, which stresses the machine and the tool.
Dementsprechend liegt der Erfindung die Aufgabe zugrunde, eine Bearbeitungsmaschine derart zu steuern, dass wechselnde Belastungen des Werkzeugs bzw. der Maschine während des Bearbeitungsvorganges vermieden werden.Accordingly The invention is based on the object, a processing machine be controlled so that changing loads of the tool or the machine during of the machining process can be avoided.
Diese Aufgabe wird durch Verfahren gemäß den Patentansprüchen 1 und 7 gelöst; die abhängigen Patentansprüche betreffen vorteilhafte Ausgestaltungen der Erfindung.These The object is achieved by methods according to claims 1 and 7 solved; refer to the dependent claims advantageous embodiments of the invention.
Erfindungsgemäß wird vorgeschlagen, den Vorschub einer Bearbeitungsmaschine derart zu steuern, dass bei einem Bearbeitungsvorgang die abgetragenen Teilvolumina pro Zeiteinheit konstant sind.According to the invention, it is proposed to control the feed of a processing machine such that during a machining process the ablated partial volumes per Time unit are constant.
Mathematisch bedeutet dies, dass der Differentialquotient bzw. der Differenzenquotient aus Volumen und Zeit bei dem Abtragsweg in etwa konstant ist.Mathematically this means that the differential quotient or the difference quotient Volume and time in the Abtragsweg is approximately constant.
Zur praktischen Umsetzung des erfindungsgemäßen Verfahrens ist es vorzuziehen, das Gesamtabtragsvolumen zu ermitteln, in gleich große Teilvolumina zu unterteilen, den jeweils dazugehörigen Teilabtragsweg zu ermitteln und die Maschine so zu steuern, dass jeder Teilabtragsweg in der gleichen Zeitspanne bearbeitet wird. Diese Vorgehensweise empfiehlt sich insbesondere bei der numerischen Behandlung und ist auch für Fälle geeignet, in denen die Geometrie des Abtragsvolumens nicht geschlossen berechenbar ist.to practical implementation of the method according to the invention, it is preferable to determine the total stock removal volume, in equally large sub-volumes to subdivide, to determine the respective Teilabtragsweg and to control the machine so that each Teilabtragsweg in the same time span is processed. This procedure recommends especially in numerical treatment and is also suitable for cases in which the geometry of the ablation volume can not be calculated closed is.
Das erfindungsgemäße Verfahren ist insbesondere zum Steuern von Fräsmaschinen geeignet, wobei die Fräsbahn, d. h. der Abtragsweg, linear oder auch gekrümmt sein kann.The inventive method is particularly suitable for controlling milling machines, wherein the cutting path, d. H. the Abtragsweg, linear or curved can be.
Ein Ausführungsbeispiel der Erfindung wird anhand der beigefügten Zeichnungen erläutert. Es zeigenOne embodiment The invention will be explained with reference to the accompanying drawings. It demonstrate
Zur
Erläuterung
des erfindungsgemäßen Verfahrens
sei angenommen, dass an den einzelnen Zähnen
Dazu
wird das Fräswerkzeug
Erkennbar hängt das Abtragsvolumen V nicht linear von der Zustellung s ab.recognizable that depends Abtragsvolumen V not linearly from the delivery s from.
Erfindungsgemäß wird deshalb
vorgeschlagen, das Gesamtabtragsvolumen V in gleiche Teilvolumina ΔV zu unterteilen
und die Zustellung derart vorzunehmen, dass immer gleiche Teilvolumina ΔV in gleichen
Zeiteinheiten abgetragen werden. In dem Graphen der
Die
in
Anhand eines einfachen geometrischen Beispiels soll das erfindungsgemäße Verfahren näher erläutert werden.Based a simple geometric example, the inventive method be explained in more detail.
Es
sei angenommen, dass ein prismenförmiger Zahn mit dreieckiger
Grundfläche
und einer Dicke d entlang eines Abtragsweges s von der Spitze her
abgefräst
werden soll, wie in
Allgemein gilt, dass das Abtragsvolumen V eine Funktion des Abtragsweges s ist, das heißt V(s).Generally holds that the removal volume V is a function of the removal path s is, that is V (s).
Andererseits wird eine Funktion s(t) gesucht, für die der Differentialquotient von V nach t konstant ist, das heißt On the other hand, a function s (t) is sought for which the differential quotient from V to t is constant, that is
Im
Fall des Zahns der
Daraus
folgt, dass im Fall der
Im Fall eines kegelförmigen Vorsprungs gilt, dass das Volumen proportional zu s3 ist, und damit folgt in gleicher Weise eine Proportionalität des Abtragswegs zu t1/3.In the case of a conical projection, the volume is proportional to s 3 , and thus a proportionality of the removal path to t 1/3 follows in the same way.
Selbstverständlich können wie
bereits erwähnt
Wertepaare numerisch ermittelt werden, wobei ggf. die Funktionen
durch Näherungsformeln
dargestellt werden können.
Dabei ist es auch möglich,
beispielsweise die in den
Desweiteren bietet es sich an, gegen Ende des Abtragsweges, d. h. bei Annäherung an die zu fertigende Oberfläche, die Vorschubgeschwindigkeit bzw. Zustellung zu verringern, um eine möglichst hohe Oberflächenqualität zu erreichen.Furthermore it makes sense, towards the end of the Abtragsweges, d. H. when approaching the surface to be finished, reduce the feed rate or delivery by one preferably to achieve high surface quality.
Die vorstehende Beschreibung bezieht sich auf einen Fräsvorgang mit linearer Fräsachse A und bewegtem Fräswerkzeug. Selbstverständlich ist es auch möglich, die vorliegende Erfindung mit gekrümmten Fräsbahnen umzusetzen und/oder mit einem bewegten Werkstück; auch ist möglich, sowohl das Werkstück als auch das Fräswerkzeug gleichzeitig zu bewegen.The The above description refers to a milling operation with linear milling axis A and moving milling tool. Of course it is also possible implement the present invention with curved Fräsbahnen and / or with a moving workpiece; it is also possible both the workpiece as also the milling tool to move at the same time.
Claims (8)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200410021866 DE102004021866A1 (en) | 2004-05-04 | 2004-05-04 | Control of a machine tool such that the volumetric removal is constant |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200410021866 DE102004021866A1 (en) | 2004-05-04 | 2004-05-04 | Control of a machine tool such that the volumetric removal is constant |
Publications (1)
Publication Number | Publication Date |
---|---|
DE102004021866A1 true DE102004021866A1 (en) | 2005-12-01 |
Family
ID=35267234
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE200410021866 Withdrawn DE102004021866A1 (en) | 2004-05-04 | 2004-05-04 | Control of a machine tool such that the volumetric removal is constant |
Country Status (1)
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DE (1) | DE102004021866A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2204711A1 (en) * | 2008-12-23 | 2010-07-07 | Siemens Aktiengesellschaft | Control device and method for controlling a movement between a tool and a workpiece |
WO2016050858A1 (en) * | 2014-10-02 | 2016-04-07 | Eikon Technologies Holding S.A.R.L. | Apparatus and method for sharpening the scraping edges of a scraper roller |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4014142A (en) * | 1974-01-16 | 1977-03-29 | Norton Company | Method and apparatus for grinding at a constant metal removal rate |
DD147216A1 (en) * | 1979-11-22 | 1981-03-25 | Dieter Drews | METHOD FOR THE ADAPTIVE CONTROL OF DENTAL GRINDING |
EP0290773A1 (en) * | 1987-05-04 | 1988-11-17 | Siemens Aktiengesellschaft | Method for manufacturing sections by grinding, and turbine blades so manufactured |
DE10236901A1 (en) * | 2001-09-07 | 2003-04-30 | Sinico S P A | Cutting system with constant chip volume for machine tools |
-
2004
- 2004-05-04 DE DE200410021866 patent/DE102004021866A1/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4014142A (en) * | 1974-01-16 | 1977-03-29 | Norton Company | Method and apparatus for grinding at a constant metal removal rate |
DD147216A1 (en) * | 1979-11-22 | 1981-03-25 | Dieter Drews | METHOD FOR THE ADAPTIVE CONTROL OF DENTAL GRINDING |
EP0290773A1 (en) * | 1987-05-04 | 1988-11-17 | Siemens Aktiengesellschaft | Method for manufacturing sections by grinding, and turbine blades so manufactured |
DE10236901A1 (en) * | 2001-09-07 | 2003-04-30 | Sinico S P A | Cutting system with constant chip volume for machine tools |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2204711A1 (en) * | 2008-12-23 | 2010-07-07 | Siemens Aktiengesellschaft | Control device and method for controlling a movement between a tool and a workpiece |
WO2016050858A1 (en) * | 2014-10-02 | 2016-04-07 | Eikon Technologies Holding S.A.R.L. | Apparatus and method for sharpening the scraping edges of a scraper roller |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OP8 | Request for examination as to paragraph 44 patent law | ||
8125 | Change of the main classification |
Ipc: B23C 3/00 AFI20051017BHDE |
|
R082 | Change of representative |
Representative=s name: GLAWE, DELFS, MOLL, PATENTANWAELTE, DE Representative=s name: GLAWE, DELFS, MOLL, PATENTANWAELTE, 80538 MUENCHEN |
|
R081 | Change of applicant/patentee |
Owner name: MAZAK, JOERG, DE Free format text: FORMER OWNER: WEIGL ENGINEERING GMBH, 85375 NEUFAHRN, DE Effective date: 20111209 Owner name: WEIGL TRANSMISSION PLANT AB, SE Free format text: FORMER OWNER: WEIGL ENGINEERING GMBH, 85375 NEUFAHRN, DE Effective date: 20111209 |
|
R082 | Change of representative |
Representative=s name: GLAWE DELFS MOLL PARTNERSCHAFT MBB VON PATENT-, DE Effective date: 20111209 |
|
R016 | Response to examination communication | ||
R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee | ||
R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee |
Effective date: 20141202 |