EP0976495B1 - Belt grinding machine - Google Patents

Belt grinding machine Download PDF

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Publication number
EP0976495B1
EP0976495B1 EP99114307A EP99114307A EP0976495B1 EP 0976495 B1 EP0976495 B1 EP 0976495B1 EP 99114307 A EP99114307 A EP 99114307A EP 99114307 A EP99114307 A EP 99114307A EP 0976495 B1 EP0976495 B1 EP 0976495B1
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EP
European Patent Office
Prior art keywords
pressure
belt
workpiece
grinding
adjustment
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EP99114307A
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German (de)
French (fr)
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EP0976495A1 (en
Inventor
Jürgen Dipl.-Ing. Heesemann
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
    • B24B49/16—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation taking regard of the load
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
    • B24B21/04—Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces
    • B24B21/06—Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces involving members with limited contact area pressing the belt against the work, e.g. shoes sweeping across the whole area to be ground
    • B24B21/08—Pressure shoes; Pressure members, e.g. backing belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
    • B24B21/04—Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces
    • B24B21/10—Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces involving a rigid member, e.g. pressure bar, table, pressing or supporting the belt over substantially its whole span

Definitions

  • the invention relates to a belt sander with an endless To guide pulleys guided grinding belt, a pressure shoe for Press the abrasive belt against a workpiece by means of a pressure device and a pressing control with which a pressing force is adjustable.
  • Such a belt grinding machine is for example by the EP 0 155 380 B1.
  • the belt grinding machine described there has a manifold pressure bar with a plurality of juxtaposed pressure shoes, which by means of a the contour of the workpiece detecting detection device are effectively or ineffectively controllable, so that only those for the Workpiece actually needed pressure shoes in an effective Grinding position to be controlled when the workpiece by means of conveyed through a conveyor under the pressure bar becomes.
  • the case provided adjustment of the pressing force of Effectively switched pressure shoes in particular has the function those pressure shoes with an edge piece of the workpiece have only a small contact surface, with a lower pressure force to press on the workpiece to an unwanted To prevent cylindrical grinding of the edges of the workpiece.
  • the control of Pressure force is preferably carried out with an electromagnet whose Pressing force of the electrical current flowing through its coil turns Electricity depends.
  • other pressure devices are possible, which act, for example, hydraulically or pneumatically.
  • JP 05-318305 A discloses a belt grinding machine in which the Pressure bar also by a variety of transverse to the conveying direction arranged pressure shoes is formed. Before the pressure shoes is the one Contour detection of the workpiece detecting means provided with the - as in EP 0 155 380 B1 - the instantaneous thickness of Workpiece is measured. Depending on the thickness of the workpiece the pressure shoes are adjusted in height, so over the controlled Stroke of the pressure shoes a uniform pressure force on the surface of the Workpiece, regardless of its thickness variations, to be realized. On the vertical displacement of the pressure shoe are three switches provided, of which the two outer as a limit switch and a middle one intended as a reference point switch.
  • a first effect is that the control of the pressure force by the Pressure device while the pressure shoe with a predetermined Pressing force in the direction of the workpiece, but this over the intermediate, endless revolving belt.
  • the pressure shoe With a thinner Workpiece becomes the pressure shoe obviously more adjusted than for a thicker workpiece.
  • There the sanding belt is guided endlessly between deflection rollers, causes the stronger deflection of the sanding belt also a higher Counterforce due to the necessary belt tension of the sanding belt, and not only because of the opposing force of a resilient mounting a deflection roller of the sanding belt, which is the deflection allows, but also because of the larger angle that the Sanding belt between the edge of the pressure shoe and the adjacent Pulley takes.
  • the invention can therefore in the evaluation a change the counterforce of the abrasive belt depending on the Deflection of the abrasive belt be entered so that through the Measurement of the deflection by measuring the adjustment of the Pressure shoe the higher drag by a correspondingly higher Pressure force can be compensated. It follows that the surface of a thinner workpiece with the same pressure - and thus with the same grinding result - ground becomes like the surface of a thicker workpiece.
  • the present invention also allows compensation of Non-linearities of the path-force characteristic of the pressure device.
  • the at a medium deflection of an electromagnet as a pressure device by a predetermined excitation current generated contact pressure undergoes changes at a lower or increased deflection, so adjustment of the pressure shoe.
  • By the detection according to the invention of the adjustment of the pressure shoe is it possible to change the pressure force accordingly, if in the evaluation device the path-force characteristic of the pressure device can be entered, which is manual in advance, but also in the Operation can be done by measuring the pressure force.
  • the invention further allows such pressure shoes, the Grinding the workpiece by itself will not be needed because of it just outside the contour of the workpiece are, at least partially to adjust, to achieve that the sanding belt not on the pressure shoe, which is straight on the edge of the workpiece is still effective, a relatively high curvature - and thus one relatively high drag - trains that become an unwanted Reduction of the pressure force in this area would result. Due to the adjustment of the grinding itself no longer needed adjacent pressure shoe in the direction of the workpiece finds the required for grinding edge pressure shoe practically the equal in essence linear course of the abrasive belt like the further inside pressure shoes.
  • Figure 1 reveals a grinding belt 1, which endlessly around pulleys 2, of which two are shown in FIG are.
  • a pressure shoe 3 is arranged, with the help of an electromagnet 4 as a pressure device pressed against the sanding belt 1 between the pulleys 2 is.
  • the pressure shoe 3 projects with a shaft 5 in the electromagnet 4 in and is through a predetermined current through the coil of the electromagnet 4 is pushed out of the electromagnet 4.
  • a permanent magnet 6 is mounted, which together with a fixed to the housing of the electromagnet 4th held sensor 7, which is a magnetostrictive sensor or Hall sensor can be as position detector for the adjustment of the Pressure shoe 3 is used.
  • the tension of the sanding belt 1 is caused by the pressure shoe 3 deflecting movement of the sanding belt 1 from the straight connection between the two pulleys 2 out a counter force F R , which, as the force parallelogram shown in Figure 1, of the size of the two of dependent pressure shoe 3 extends to the guide roller 2 forces vectors F 1 and F 2 and the direction of the two vectors F 1, f 2.
  • a counterforce F R is generated by the small deflection shown in FIG. 1, while in the strong adjustment of the pressure shoe 3 shown in FIG. 2 and the associated large deflection of the sanding belt 1 between the two Pulleys 2 a significantly larger counterforce F R arises.
  • the degree of deflection of the sanding belt 1 and the adjustment of the pressure shoe 3 is measured by the detector assembly 6,7 and used in a (not shown) evaluation for generating a higher reaction force F R compensating higher pressure force, so that the force acting on the workpiece resulting force in both cases can be the same size.
  • the output signal of the Detector arrangement 6,7 compensation can be controlled.
  • FIG. 3 schematically shows the hitherto customary adjustment of pressure shoes 3 for a workpiece 8 transported under the pressure shoes 3 and the sanding belt 1. All pressure shoes 3, which are aligned with the contour of the workpiece 8, are delivered for grinding, that is, moved to a position S 2 , The pressure shoes 3 not affected by the contour of the workpiece 8 remain in their rest position S 0 . The pressure shoe acting only on the edge of the workpiece 8 is thereby equipped only with a lower pressure force.
  • the sliding edge pressure shoe 3 is further adjusted to the position S 2 , the adjacent pressure shoe but then to a position S 1 , which between the rest position S 0 and the grinding position S 2 is located.
  • This adjustment is possible according to the invention by the position detection of the pressure shoes 3.
  • the adjustment of the pressure shoe 3 not required for the grinding process to the position S 1 reduces the deformation of the sanding belt 1 on the sanding edge pressure shoe (position S 2 ) in the form of a counterforce.
  • FIGS. 4 and 5 are due to the adjustment of the pressure shoes 3 sensing detector assemblies 6.7 feasible. With a mere control the pressing force F could not be achieved this result.

Abstract

A belt grinding machine has a grinding belt continuously guided about at least two deflection rollers 2, a pressure shoe 3 that presses the grinding belt 1 against a workpiece 8 by a contact pressure apparatus. The belt grinding machine also has a contact pressure control that allows a contact pressure force to be set. The uniformity and reproducibility of the grinding results are improved by a detector arrangement 6, 7 that senses the adjustment of the pressure shoe 3 and an evaluation device that influences the contact pressure control as a function of the sensed adjustment of the pressure shoe 3.

Description

Die Erfindung betrifft eine Bandschleifmaschine mit einem endlos um Umlenkrollen geführten Schleifband, einem Druckschuh zum Drücken des Schleifbandes gegen ein Werkstück mittels einer Andruckvorrichtung und eine Andrucksteuerung, mit der eine Andruckkraft einstellbar ist.The invention relates to a belt sander with an endless To guide pulleys guided grinding belt, a pressure shoe for Press the abrasive belt against a workpiece by means of a pressure device and a pressing control with which a pressing force is adjustable.

Eine derartige Bandschleifmaschine ist beispielsweise durch die EP 0 155 380 B1 bekannt. Die dort beschriebene Bandschleifmaschine weist einen Gliederdruckbalken mit einer Vielzahl von nebeneinander angeordneten Druckschuhen auf, die mittels einer die Kontur des Werkstückes detektierenden Detektionseinrichtung wirksam oder unwirksam steuerbar sind, so daß nur die für das Werkstück tatsächlich benötigten Druckschuhe in eine wirksame Schleifstellung gesteuert werden, wenn das Werkstück mittels einer Fördereinrichtung unter dem Druckbalken hindurchgefördert wird. Die dabei vorgesehene Einstellung der Andruckkraft der wirksam geschalteten Druckschuhe hat insbesondere die Funktion, diejenigen Druckschuhe, die mit einem Randstück des Werkstückes nur eine geringe Kontaktfläche haben, mit einer geringeren Andruckkraft auf das Werkstück zu drücken, um ein ungewolltes Rundschleifen der Kanten des Werkstückes zu verhindern. Die Steuerung der Andruckkraft erfolgt dabei vorzugsweise mit einem Elektromagneten, dessen Andruckkraft von der durch seine Spulenwindungen fließenden elektrischen Strom abhängt. Allerdings sind auch andere Andruckvorrichtungen möglich, die beispielsweise hydraulisch oder pneumatisch wirken.Such a belt grinding machine is for example by the EP 0 155 380 B1. The belt grinding machine described there has a manifold pressure bar with a plurality of juxtaposed pressure shoes, which by means of a the contour of the workpiece detecting detection device are effectively or ineffectively controllable, so that only those for the Workpiece actually needed pressure shoes in an effective Grinding position to be controlled when the workpiece by means of conveyed through a conveyor under the pressure bar becomes. The case provided adjustment of the pressing force of Effectively switched pressure shoes in particular has the function those pressure shoes with an edge piece of the workpiece have only a small contact surface, with a lower pressure force to press on the workpiece to an unwanted To prevent cylindrical grinding of the edges of the workpiece. The control of Pressure force is preferably carried out with an electromagnet whose Pressing force of the electrical current flowing through its coil turns Electricity depends. However, other pressure devices are possible, which act, for example, hydraulically or pneumatically.

Die Realisierung dieses bekannten Prinzips der Steuerung einer Bandschleifmaschine erfolgt dadurch, dass beispielsweise die Kontur des Werkstücks detektiert wird und für den Mittenbereich des Werkstücks eine Andruckkraft durch die Andrucksteuerung vorgegeben wird, die bei einer elektromagnetischen Ansteuerung einem vorgegebenen Strom durch den Elektromagneten des Druckschuhs hervorruft. Analoges gilt für die denkbare Realisierung mit pneumatischen oder hydraulischen Antrieben.The realization of this known principle of controlling a belt sander takes place in that, for example, the contour of the workpiece is detected and for the central region of the workpiece, a pressing force is predetermined by the Andrucksteuerung, in an electromagnetic Driving a predetermined current through the electromagnet of the pressure shoe causes. The same applies to the conceivable realization with pneumatic or hydraulic drives.

Durch JP 05-318305 A ist eine Bandschleifmaschine bekannt, bei der der Druckbalken ebenfalls durch eine Vielzahl von quer zur Förderrichtung angeordneten Druckschuhen gebildet ist. Vor den Druckschuhen ist eine die Kontur des Werkstücks detektierende Detektionseinrichtung vorgesehen, mit der die - wie auch bei der EP 0 155 380 B1 - die momentane Dicke des Werkstücks gemessen wird. In Abhängigkeit von der Dicke des Werkstücks werden die Druckschuhe in ihrer Höhe verstellt, sodass über den gesteuerten Hub der Druckschuhe eine gleichmäßige Andruckkraft auf der Oberfläche des Werkstücks, unabhängig von dessen Dickenvariationen, realisiert werden soll. Auf dem vertikalen Verstellweg des Druckschuhs sind drei Schalter vorgesehen, von denen die beiden äußeren als Endschalter und ein mittlerer als Referenzpunktschalter bestimmt sind. Diese Schalter ermöglichen das Verfahren des Druckschuhs in eine definierte Ausgangsstellung, die mit einer entsprechenden definierten Ausgangsstellung eines Sensorzylinders korrespondiert, um so den aufgrund der Dicke des Werkstücks aus der Ausgangsstellung zurückgelegten Verfahrweg des Sensorzylinders auf einen entsprechenden Verfahrweg des Druckschuhs zu übertragen. Nach der entsprechenden Verstellung des Druckschuhs ist eine Variation der Andruckkräfte nicht offenbart, da auf die Oberfläche eine überall gleiche Andruckkraft wirken soll.JP 05-318305 A discloses a belt grinding machine in which the Pressure bar also by a variety of transverse to the conveying direction arranged pressure shoes is formed. Before the pressure shoes is the one Contour detection of the workpiece detecting means provided with the - as in EP 0 155 380 B1 - the instantaneous thickness of Workpiece is measured. Depending on the thickness of the workpiece the pressure shoes are adjusted in height, so over the controlled Stroke of the pressure shoes a uniform pressure force on the surface of the Workpiece, regardless of its thickness variations, to be realized. On the vertical displacement of the pressure shoe are three switches provided, of which the two outer as a limit switch and a middle one intended as a reference point switch. These switches allow that Method of the pressure shoe in a defined starting position, with a corresponding defined starting position of a sensor cylinder corresponds to the so due to the thickness of the workpiece from the Initial position traversed the sensor cylinder on a corresponding traverse path of the pressure shoe to transfer. After corresponding adjustment of the pressure shoe is a variation of Pressure forces are not revealed, because on the surface a same everywhere Pressure should act.

Umfangreiche Untersuchungen und Erfahrungen des Erfinders mit den Bandschleifmaschinen der genannten Art haben die Erkenntnis gebracht, dass auch die bereits sehr hochentwickelten Bandschleifmaschinen der bekannten Art noch verbesserbar sind.Extensive investigations and experiences of the inventor with the Belt grinding machines of the type mentioned have brought the knowledge that also the already very sophisticated belt sanding machines of the known Art are still improvable.

Ausgehend von der generellen Problemstellung, bekannte Bandschfeifmaschinen zur Optimierung des Schleifergebnisses zu verbessern, ist erfindungsgemäß die Bandschleifmaschine der eingangs erwähnten Art gekennzeichnet durch eine die Verstellung des Druckschuhs sensierende Detektoranordnung und eine Auswerteeinrichtung zur Beeinflussung der Andrucksteuerung in Abhängigkeit von der sensierten Verstellung des Druckschuhs.Based on the general problem, known Bandschfeifmaschinen to improve the grinding result is According to the belt grinding machine of the type mentioned characterized by a the adjustment of the pressure shoe sensing Detector arrangement and an evaluation device for influencing the Pressure control depending on the sensed adjustment of the Pressure shoe.

Mit der Erfindung ist eine Anzahl ganz unterschiedlicher Verbesserungen an den bekannten Bandschleifmaschinen möglich.With the invention is a number of very different improvements the known belt sanders possible.

Ein erster Effekt besteht darin, dass die Steuerung der Andruckkraft durch die Andruckeinrichtung den Druckschuh zwar mit einer vorgegebenen Andruckkraft in Richtung auf das Werkstück drückt, dies jedoch über das zwischengeschaltete, endlos umlaufende Schleifband. Bei einem dünneren Werkstück wird der Druckschuh ersichtlich stärker verstellt als für ein dickeres Werkstück. Da das Schleifband zwischen Umlenkrollen endlos geführt ist, bewirkt die stärkere Auslenkung des Schleifbandes auch eine höhere Gegenkraft durch die notwendige Bandspannung des Schleifbandes, und zwar nicht nur aufgrund der Gegenkraft einer federnden Lagerung einer Umlenkrolle des Schleifbandes, die die Auslenkung ermöglicht, sondern auch aufgrund der größeren Winkel, den das Schleifband zwischen dem Rand des Druckschuhs und der benachbarten Umlenkrolle einnimmt. In einer bevorzugten Ausführungsform der Erfindung kann daher in die Auswerteeinrichtung eine Änderung der Gegenkraft des Schleifbandes in Abhängigkeit von der Auslenkung des Schleifbandes eingegeben sein, so daß durch die Messung der Auslenkung durch die Messung der Verstellung des Druckschuhs die höhere Gegenkraft durch eine entsprechend höhere Andruckkraft kompensiert werden kann. Hieraus resultiert, daß die Oberfläche eines dünneren Werkstückes mit der gleichen Andruckkraft - und somit mit dem gleichen Schleifergebnis - geschliffen wird wie die Oberfläche eines dickeren Werkstückes.A first effect is that the control of the pressure force by the Pressure device while the pressure shoe with a predetermined Pressing force in the direction of the workpiece, but this over the intermediate, endless revolving belt. At a thinner Workpiece becomes the pressure shoe obviously more adjusted than for a thicker workpiece. There the sanding belt is guided endlessly between deflection rollers, causes the stronger deflection of the sanding belt also a higher Counterforce due to the necessary belt tension of the sanding belt, and not only because of the opposing force of a resilient mounting a deflection roller of the sanding belt, which is the deflection allows, but also because of the larger angle that the Sanding belt between the edge of the pressure shoe and the adjacent Pulley takes. In a preferred embodiment The invention can therefore in the evaluation a change the counterforce of the abrasive belt depending on the Deflection of the abrasive belt be entered so that through the Measurement of the deflection by measuring the adjustment of the Pressure shoe the higher drag by a correspondingly higher Pressure force can be compensated. It follows that the surface of a thinner workpiece with the same pressure - and thus with the same grinding result - ground becomes like the surface of a thicker workpiece.

Die vorliegende Erfindung erlaubt ferner eine Kompensation von Nicht-Linearitäten der Weg-Kraft-Kennlinie der Andruckvorrichtung. Die bei einer mittleren Auslenkung eines Elektromagneten als Andruckvorrichtung durch einen vorgegebenen Erregerstrom erzeugte Andruckkraft erfährt Änderungen bei einer geringeren oder vergrößerten Auslenkung, also Verstellung des Druckschuhs. Durch die erfindungsgemäße Detektion der Verstellung des Druckschuhs ist es möglich, die Andruckkraft entsprechend zu ändern, wenn in die Auswerteeinrichtung die Weg-Kraft-Kennlinie der Andruckeinrichtung eingebbar ist, was vorab manuell, aber auch im Betrieb durch Messung der Andruckkraft geschehen kann.The present invention also allows compensation of Non-linearities of the path-force characteristic of the pressure device. The at a medium deflection of an electromagnet as a pressure device by a predetermined excitation current generated contact pressure undergoes changes at a lower or increased deflection, so adjustment of the pressure shoe. By the detection according to the invention of the adjustment of the pressure shoe is it possible to change the pressure force accordingly, if in the evaluation device the path-force characteristic of the pressure device can be entered, which is manual in advance, but also in the Operation can be done by measuring the pressure force.

Besondere vorteilhafte Anwendungsfälle für die vorliegende Erfindung ergeben sich bei Bandschleifmaschinen der Art, die eine Vielzahl von nebeneinander angeordneten, einen auf dasselbe Schleifband einwirkenden Druckbalken bildenden Druckschuhen, eine Fördereinrichtung zum Fördern des Werkstücks relativ zum Druckbalken und eine Detektionseinrichtung für die Kontur des Werkstückes und eine Steuerung zum Wirksam- und Unwirksamschalten der Druckschuhe in Abhängigkeit von dem Signal der Detektionseinrichtung aufweist.Special advantageous applications for the present invention arise in belt sanding machines of the type, the one Variety of juxtaposed, one on the same Sanding belt acting pressure bar forming pressure shoes, a conveyor for conveying the workpiece relative to Pressure bar and a detection device for the contour of the Workpiece and a control to the effective and ineffective switching the pressure shoes in response to the signal of the detection device having.

Neben der in diesem Fall vorteilhaften möglichen Verringerung der Andruckkraft im Randbereich des Werkstücks kann es erfindungsgemäß sinnvoll sein, die Verstellung von Druckschuhen, insbesondere im Randbereich eines Werkstücks, durch eine detektierte Verstellung wenigstens eines Druckschuhs in einem anderen Bereich des Werkstückes, vorzugsweise in einem mittleren Bereich, zu begrenzen. Dadurch wird sichergestellt, daß auf gar keinen Fall in empfindlichen Bereichen eine höhere Schleifeinwirkung erfolgt.In addition to the advantageous in this case possible reduction the pressure force in the edge region of the workpiece can according to the invention be useful, the adjustment of pressure shoes, in particular in the edge region of a workpiece, by a detected Adjustment of at least one pressure shoe in another Area of the workpiece, preferably in a central area, to limit. This will ensure that at all no case in sensitive areas a higher abrasive action he follows.

Die Erfindung erlaubt ferner, solche Druckschuhe, die zum Schleifen des Werkstücks an sich nicht benötigt werden, weil sie gerade außerhalb der Kontur des Werkstückes liegen, auch zumindest teilweise zu verstellen, um zu erreichen, daß das Schleifband nicht an dem Druckschuh, der am Rand des Werkstücks gerade noch wirksam ist, eine relativ hohe Krümmung - und damit eine relativ hohe Gegenkraft - ausbildet, die zu einer ungewollten Verringerung der Andruckkraft in diesem Bereich führen würde. Durch die Verstellung des zum Schleifen an sich nicht mehr benötigten benachbarten Druckschuhs in Richtung auf das Werkstück findet der zum Schleifen benötigte Rand-Druckschuh praktisch den gleichen im wesentlichen linearen Verlauf des Schleifbandes vor wie die weiter innenliegenden Druckschuhe. The invention further allows such pressure shoes, the Grinding the workpiece by itself will not be needed because of it just outside the contour of the workpiece are, at least partially to adjust, to achieve that the sanding belt not on the pressure shoe, which is straight on the edge of the workpiece is still effective, a relatively high curvature - and thus one relatively high drag - trains that become an unwanted Reduction of the pressure force in this area would result. Due to the adjustment of the grinding itself no longer needed adjacent pressure shoe in the direction of the workpiece finds the required for grinding edge pressure shoe practically the equal in essence linear course of the abrasive belt like the further inside pressure shoes.

Die Erfindung soll im folgenden anhand eines in der Zeichnung schematisch dargestellten Ausführungsbeispiels näher erläutert werden. Es zeigen:

Figur 1 -
eine schematische Anordnung eines elektromagnetisch betätigten Druckschuhs, der auf ein umlaufendes Schleifband wirkt, mit einer geringen Verstellung des Druckschuhs (dickes Werkstück);
Figur 2 -
eine Darstellung gemäß Figur 1 mit einer großen Verstellung des Druckschuhs (dünnes Werkstück);
Figur 3 -
eine schematische Darstellung der Verstellung von Druckschuhen gemäß dem Stand der Technik;
Figur 4 -
eine schematische Darstellung der Druckschuhe am Randbereich eines Werkstücks gemäß einem Ausführungsbeispiel der Erfindung;
Figur 5 -
eine schematische Darstellung der Verstellung von Druckschuhen am Randbereich eines Werkstücks gemäß einer weiteren Ausführungsform der Erfindung.
The invention will be explained in more detail below with reference to an embodiment schematically illustrated in the drawing. Show it:
FIG. 1 -
a schematic arrangement of an electromagnetically operated pressure shoe, which acts on a rotating abrasive belt, with a small adjustment of the pressure shoe (thick workpiece);
FIG. 2 -
a view according to Figure 1 with a large adjustment of the pressure shoe (thin workpiece);
FIG. 3 -
a schematic representation of the adjustment of pressure shoes according to the prior art;
FIG. 4 -
a schematic representation of the pressure shoes at the edge region of a workpiece according to an embodiment of the invention;
FIG. 5 -
a schematic representation of the adjustment of pressure shoes at the edge region of a workpiece according to another embodiment of the invention.

Figur 1 läßt ein Schleifband 1 erkennen, das endlos um Umlenkrollen 2 geführt ist, von denen in Figur 1 zwei dargestellt sind. Zwischen den Umlenkrollen ist ein Druckschuh 3 angeordnet, der mit Hilfe eines Elektromagneten 4 als Andruckvorrichtung gegen das Schleifband 1 zwischen den Umlenkrollen 2 drückbar ist. Der Druckschuh 3 ragt mit einem Schaft 5 in den Elektromagneten 4 hinein und wird durch einen vorgegebenen Strom durch die Spule des Elektromagneten 4 aus dem Elektromagneten 4 herausgedrückt.Figure 1 reveals a grinding belt 1, which endlessly around pulleys 2, of which two are shown in FIG are. Between the pulleys, a pressure shoe 3 is arranged, with the help of an electromagnet 4 as a pressure device pressed against the sanding belt 1 between the pulleys 2 is. The pressure shoe 3 projects with a shaft 5 in the electromagnet 4 in and is through a predetermined current through the coil of the electromagnet 4 is pushed out of the electromagnet 4.

An dem Druckschuh 3 ist ein Permanentmagnet 6 montiert:, der zusammen mit einem ortsfest an dem Gehäuse des Elektromagneten 4 gehaltenen Sensor 7, der ein magnetostrektiver Sensor oder Hallsensor sein kann, als Positionsdetektor für den Verstellweg des Druckschuhs 3 dient.On the pressure shoe 3, a permanent magnet 6 is mounted, which together with a fixed to the housing of the electromagnet 4th held sensor 7, which is a magnetostrictive sensor or Hall sensor can be as position detector for the adjustment of the Pressure shoe 3 is used.

Die Spannung des Schleifbandes 1 setzt der durch den Druckschuh 3 bewirkten Auslenkbewegung des Schleifbandes 1 aus der geraden Verbindung zwischen den beiden dargestellten Umlenkrollen 2 heraus eine Gegenkraft FR entgegen, die, wie das in Figur 1 dargestellte Kräfteparallelogramm zeigt, von der Größe der beiden vom Druckschuh 3 zur Umlenkrolle 2 verlaufenden Kräftevektoren F1 und F2 und von der Richtung der beiden Vektoren F1,F2 abhängt. Bei gleicher Größe der Kräfte F1,F2 wird durch die in Figur 1 dargestellte geringe Auslenkung eine nur geringe Gegenkraft FR erzeugt, während bei der in Figur 2 dargestellten starken Verstellung des Druckschuhs 3 und der damit verbundenen großen Auslenkung des Schleifbandes 1 zwischen den Umlenkrollen 2 eine erheblich größere Gegenkraft FR entsteht. Das Maß der Auslenkung des Schleifbandes 1 bzw. der Verstellung des Druckschuhs 3 wird durch die Detektoranordnung 6,7 gemessen und in einer (nicht dargestellten) Auswerteeinrichtung zur Erzeugung einer die höhere Gegenkraft FR kompensierenden höheren Andruckkraft verwendet, so daß die auf das Werkstück einwirkende resultierende Kraft in beiden Fällen gleich groß sein kann.The tension of the sanding belt 1 is caused by the pressure shoe 3 deflecting movement of the sanding belt 1 from the straight connection between the two pulleys 2 out a counter force F R , which, as the force parallelogram shown in Figure 1, of the size of the two of dependent pressure shoe 3 extends to the guide roller 2 forces vectors F 1 and F 2 and the direction of the two vectors F 1, f 2. With the same magnitude of the forces F 1 , F 2 , only a small counterforce F R is generated by the small deflection shown in FIG. 1, while in the strong adjustment of the pressure shoe 3 shown in FIG. 2 and the associated large deflection of the sanding belt 1 between the two Pulleys 2 a significantly larger counterforce F R arises. The degree of deflection of the sanding belt 1 and the adjustment of the pressure shoe 3 is measured by the detector assembly 6,7 and used in a (not shown) evaluation for generating a higher reaction force F R compensating higher pressure force, so that the force acting on the workpiece resulting force in both cases can be the same size.

Ähnliches gilt für die Änderung der Strom-Kraft-Kennlinie des Elektromagneten 4 in Abhängigkeit vom Verstellweg des Druckschuhs 3. Auch diesbezüglich kann über das Ausgangssignal der Detektoranordnung 6,7 eine Kompensation gesteuert werden.The same applies to the change in the current-power characteristic of the Electromagnet 4 depending on the adjustment of the pressure shoe 3. Also in this regard, the output signal of the Detector arrangement 6,7 compensation can be controlled.

Figur 3 zeigt schematisch die bisher übliche Verstellung von Druckschuhen 3 für ein unter den Druckschuhen 3 und dem Schleifband 1 hindurchtransportiertes Werkstück 8. Alle Druckschuhe 3, die mit der Kontur des Werkstücks 8 fluchten, werden zum Schleifen zugestellt, also auf eine Position S2 verbracht. Die nicht von der Kontur des Werkstücks 8 betroffenen Druckschuhe 3 bleiben in ihrer Ruhestellung S0. Der nur den Rand des Werkstücks 8 beaufschlagende Druckschuh wird dabei nur mit einer geringeren Andruckkraft ausgestattet. FIG. 3 schematically shows the hitherto customary adjustment of pressure shoes 3 for a workpiece 8 transported under the pressure shoes 3 and the sanding belt 1. All pressure shoes 3, which are aligned with the contour of the workpiece 8, are delivered for grinding, that is, moved to a position S 2 , The pressure shoes 3 not affected by the contour of the workpiece 8 remain in their rest position S 0 . The pressure shoe acting only on the edge of the workpiece 8 is thereby equipped only with a lower pressure force.

Gemäß einer Ausführungsform der Erfindung, die in Figur 4 dargestellt ist, wird in der Situation gemäß Figur 3 weiterhin der schleifende Rand-Druckschuh 3 auf die Position S2 verstellt, der dann benachbarte Druckschuh jedoch auf eine Position S1, die zwischen der Ruheposition S0 und der Schleifposition S2 liegt. Diese Verstellung ist durch die Positionsdetektion der Druckschuhe 3 erfindungsgemäß möglich. Die Verstellung des für den Schleifvorgang nicht benötigten Druckschuh 3 auf die Position S1 vermindert den durch die Verformung des Schleifbandes 1 auf den schleifenden Rand-Druckschuh (Position S2) in Form einer Gegenkraft.According to one embodiment of the invention, which is shown in Figure 4, in the situation shown in Figure 3, the sliding edge pressure shoe 3 is further adjusted to the position S 2 , the adjacent pressure shoe but then to a position S 1 , which between the rest position S 0 and the grinding position S 2 is located. This adjustment is possible according to the invention by the position detection of the pressure shoes 3. The adjustment of the pressure shoe 3 not required for the grinding process to the position S 1 reduces the deformation of the sanding belt 1 on the sanding edge pressure shoe (position S 2 ) in the form of a counterforce.

In einer weiteren Ausführungsform der Erfindung, die in Figur 5 dargestellt ist, wird auch der dem schleifenden Rand-Druckschuh 3 benachbarte, für das Schleifen nicht mehr benötigte Druckschuh 3 in die Position S2 verstellt, also sozusagen in die Position S2 des schleifenden Rand-Druckschuhs 3 mitgenommen, um den schleifenden Rand-Druckschuh von allen Reaktionskräften des Schleifbandes zu entlasten.In a further embodiment of the invention, which is shown in Figure 5, and the sanding edge pressure shoe 3 adjacent, no longer required for grinding pressure shoe 3 is moved to the position S 2 , that is, so to speak, in the position S 2 of the grinding edge -Druckschuhs 3 taken to relieve the abrasive edge pressure shoe of all reaction forces of the abrasive belt.

Die in Figur 4 und 5 dargestellten Varianten der Erfindung sind aufgrund der die Verstellung der Druckschuhe 3 sensierenden Detektoranordnungen 6,7 realisierbar. Mit einer bloßen Steuerung der Andruckkraft F könnte dieses Ergebnis nicht erreicht werden.The variants of the invention shown in FIGS. 4 and 5 are due to the adjustment of the pressure shoes 3 sensing detector assemblies 6.7 feasible. With a mere control the pressing force F could not be achieved this result.

Claims (5)

  1. Belt grinding machine having a grinding belt (1) endlessly guided around guide rollers (2), a pressure shoe (3) for pressing the grinding belt (1) against a workpiece (8) by means of a pressure apparatus (4), and a pressure control whereby a pressure force can be set, characterized by a detector arrangement (6, 7) sensing the adjustment of the pressure shoe (3) and an evaluation device for influencing the pressure control as a function of the sensed adjustment of the pressure shoe (3).
  2. Belt grinding machine according to Claim 1, characterized in that a change in the counterpressure (FR) of the grinding belt (1) as a function of the deviation of the grinding belt (1) can be input into the evaluation device.
  3. Belt grinding machine according to Claim 1 or 2, characterized in that the force/travel characteristic of the pressure device (4) can be input into the evaluation device.
  4. Belt grinding machine according to one of Claims 1 to 3, having a plurality of pressure shoes (3) arranged side by side and forming a pressure beam acting on the same grinding belt (1), a conveyor for conveying the workpiece (8) relative to the pressure beam, and a detection device for the contour of the workpiece (8) and a control for activating and inactivating the pressure shoes (3) as a function of the signal from the detection device, characterized by a limitation of the adjustment of pressure shoes (3), especially in the marginal region of a workpiece (8), by a detected adjustment of at least one pressure shoe (3) in a different region of the workpiece (8).
  5. Belt grinding machine according to one of Claims 1 to 4, having a plurality of pressure shoes (3) arranged side by side and forming a pressure beam acting on the same grinding belt (1), a conveyor for conveying the workpiece (8) relative to the pressure beam, and a detection device for the contour of the workpiece (8) and a control for activating and inactivating the pressure shoes (3) as a function of the signal from the detection device, characterized in that the evaluation device can be used to control an at least partial adjustment of a pressure shoe (3) not needed per se for the grinding of the workpiece (8).
EP99114307A 1998-07-28 1999-07-21 Belt grinding machine Expired - Lifetime EP0976495B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833881 1998-07-28
DE19833881A DE19833881C1 (en) 1998-07-28 1998-07-28 Belt grinding machine with endless grinding band running over deflector rollers

Publications (2)

Publication Number Publication Date
EP0976495A1 EP0976495A1 (en) 2000-02-02
EP0976495B1 true EP0976495B1 (en) 2003-05-07

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EP99114307A Expired - Lifetime EP0976495B1 (en) 1998-07-28 1999-07-21 Belt grinding machine

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US (1) US6290570B1 (en)
EP (1) EP0976495B1 (en)
JP (1) JP4949544B2 (en)
CN (1) CN1173802C (en)
AT (1) ATE239585T1 (en)
CA (1) CA2278912C (en)
DE (3) DE19833881C1 (en)
DK (1) DK0976495T3 (en)
ES (1) ES2196686T3 (en)
PT (1) PT976495E (en)

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CH701756A1 (en) * 2009-09-07 2011-03-15 Kuendig Ag Cross Ribbon grinder use control of the whole grinding unit.
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Also Published As

Publication number Publication date
CA2278912C (en) 2006-09-12
JP4949544B2 (en) 2012-06-13
DE19833881C1 (en) 1999-10-21
ES2196686T3 (en) 2003-12-16
ATE239585T1 (en) 2003-05-15
EP0976495A1 (en) 2000-02-02
CN1173802C (en) 2004-11-03
DK0976495T3 (en) 2003-07-21
CA2278912A1 (en) 2000-01-28
DE29910147U1 (en) 1999-08-12
JP2000042892A (en) 2000-02-15
US6290570B1 (en) 2001-09-18
CN1246401A (en) 2000-03-08
DE59905417D1 (en) 2003-06-12
PT976495E (en) 2003-09-30

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