EP0976495A1 - Belt grinding machine - Google Patents

Belt grinding machine Download PDF

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Publication number
EP0976495A1
EP0976495A1 EP99114307A EP99114307A EP0976495A1 EP 0976495 A1 EP0976495 A1 EP 0976495A1 EP 99114307 A EP99114307 A EP 99114307A EP 99114307 A EP99114307 A EP 99114307A EP 0976495 A1 EP0976495 A1 EP 0976495A1
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EP
European Patent Office
Prior art keywords
pressure
belt
workpiece
grinding
adjustment
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Granted
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EP99114307A
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German (de)
French (fr)
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EP0976495B1 (en
Inventor
Jürgen Dipl.-Ing. Heesemann
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Individual
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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 sanding belt guided around deflection rollers, a pressure shoe for Pressing the sanding belt against a workpiece using a pressure device and a pressure control with which a pressure force is adjustable.
  • Such a belt grinder is, for example, by EP 0 155 380 B1 known.
  • the belt sander described there has a link pressure bar with a variety 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 Workpiece pressure shoes actually needed in an effective Grinding position can be controlled when using the workpiece conveyed by a conveyor under the pressure beam becomes.
  • the intended setting of the pressure force of the effectively activated pressure shoes has in particular the function those pressure shoes with an edge piece of the workpiece have only a small contact area, with a lower pressure force to press on the workpiece to make an unwanted To prevent cylindrical grinding of the edges of the workpiece.
  • the pressure force is preferably controlled with a Electromagnet, the pressing force of which by its coil turns flowing electrical current depends.
  • other pressure devices possible for example act hydraulically or pneumatically.
  • the belt sander is the beginning mentioned type characterized by a the adjustment of the pressure shoe sensing detector arrangement and an evaluation device to influence the pressure control depending from the sensed adjustment of the pressure shoe.
  • a first effect is that the control of the pressing force by the pressure device the pressure shoe with a presses the specified pressure force towards the workpiece, however, this via the intermediate, endlessly circulating Sanding belt.
  • the pressure shoe clearly adjusted more than for a thicker workpiece.
  • the sanding belt between the pulleys is endless the greater deflection of the grinding belt also a higher one Counterforce due to the necessary belt tension of the grinding belt, and not just because of the counterforce of a resilient bearing a deflection roller of the grinding 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 neighboring one Takes pulley.
  • the invention can therefore be changed in the evaluation device the counterforce of the sanding belt depending on the Deflection of the grinding belt must be entered so that by the Measurement of the deflection by measuring the adjustment of the Pressure shoe the higher counterforce by a correspondingly higher Contact pressure can be compensated.
  • 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 displacement-force characteristic of the pressure device.
  • the one with a medium deflection of an electromagnet as a pressure device by a given excitation current generated pressure force changes at a lower or increased deflection, i.e. adjustment of the pressure shoe.
  • By detecting the adjustment of the pressure shoe according to the invention it is possible to change the pressure force accordingly, if the displacement-force characteristic of the pressure device is in the evaluation device what can be entered manually, but also in advance Operation can be done by measuring the pressure force.
  • belt grinders such as one Large number of side by side, one on the same Pressure shoes acting on the abrasive belt, a conveyor for conveying the workpiece relative to the Pressure bar and a detection device for the contour of the Workpiece and a control for switching on and off of the pressure shoes as a function of the signal from the detection device having.
  • the pressing force in the edge region of the workpiece can be done according to the invention make sense to adjust pressure shoes, in particular in the edge area 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 on never a higher grinding action in sensitive areas he follows.
  • the invention also allows such pressure shoes, which for Grinding the workpiece itself is not needed because of it lie just outside the contour of the workpiece, at least partially to adjust to achieve that the sanding belt not on the pressure shoe that is just on the edge of the workpiece is still effective, a relatively high curvature - and therefore one relatively high drag - that trains to an unwanted Reduction of the contact pressure in this area would result.
  • the edge pressure shoe required for grinding finds practically that same essentially linear course of the grinding belt like the inner pressure shoes.
  • Figure 1 shows a sanding belt 1, the endless around pulleys 2 is guided, two of which are shown in Figure 1 are.
  • a pressure shoe 3 is arranged between the deflection rollers, with the help of an electromagnet 4 as a pressure device can be pressed against the grinding belt 1 between the deflection rollers 2 is.
  • the pressure shoe 3 projects with a shaft 5 into the electromagnet 4 and is passed through by a predetermined current the coil of the electromagnet 4 is pushed out of the electromagnet 4.
  • a permanent magnet 6 is mounted on the pressure shoe 3, which together with a stationary on the housing of the electromagnet 4th held sensor 7, which is a magnetostrective sensor or Hall sensor can be as a position detector for the adjustment of the Pressure shoe 3 is used.
  • a counterforce F R which, as the parallelogram of forces shown in FIG. 1 shows, depends on the size of the two from 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.
  • the small deflection shown in FIG. 1 produces only a small counterforce F R , while the strong adjustment of the pressure shoe 3 shown in FIG.
  • the degree of deflection of the sanding belt 1 or the adjustment of the pressure shoe 3 is measured by the detector arrangement 6, 7 and used in an evaluation device (not shown) for generating a higher contact pressure compensating the higher counterforce F R , so that the pressure acting on the workpiece resulting force can be the same in both cases.
  • the output signal of Detector arrangement 6.7 can be controlled compensation.
  • FIG. 3 schematically shows the adjustment of pressure shoes 3 which has been customary up to now for a workpiece 8 which is transported under the pressure shoes 3 and the sanding belt 1. All pressure shoes 3 which are in alignment with the contour of the workpiece 8 are fed in for grinding, that is to say 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 only equipped with a lower pressure force.
  • the sliding edge pressure shoe 3 is further adjusted to the position S 2 , but the adjacent pressure shoe, however, is adjusted to a position S 1 which is between the rest position S 0 and the grinding position S 2 .
  • This adjustment is possible according to the invention by the position detection of the pressure shoes 3.
  • the adjustment of the pressure shoe 3 which is not required for the grinding process to the position S 1 reduces that in the form of a counterforce due to the deformation of the grinding belt 1 on the grinding edge pressure shoe (position S 2 ).
  • the pressure shoe 3 which is adjacent to the grinding edge pressure shoe 3 and is no longer required for grinding is also moved into position S 2 , that is to say into position S 2 of the grinding edge -Pressure shoe 3 taken to relieve the grinding edge pressure shoe of all reaction forces of the sanding belt.
  • FIGS. 4 and 5 are due to the detector arrangements sensing the adjustment of the pressure shoes 3 6.7 realizable. With a mere control the pressing force F could not achieve 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 sanding belt guided around deflection rollers, a pressure shoe for Pressing the sanding belt against a workpiece using a pressure device and a pressure control with which a pressure 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 grinder is, for example, by EP 0 155 380 B1 known. The belt sander described there has a link pressure bar with a variety 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 Workpiece pressure shoes actually needed in an effective Grinding position can be controlled when using the workpiece conveyed by a conveyor under the pressure beam becomes. The intended setting of the pressure force of the effectively activated pressure shoes has in particular the function those pressure shoes with an edge piece of the workpiece have only a small contact area, with a lower pressure force to press on the workpiece to make an unwanted To prevent cylindrical grinding of the edges of the workpiece. The The pressure force is preferably controlled with a Electromagnet, the pressing force of which by its coil turns flowing electrical current depends. However other pressure devices possible, for example act 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 implementation of this well-known principle of controlling one Belt grinding machine takes place in that, for example, the contour of the workpiece is detected and for the central area of the Workpiece pressure specified by the pressure control is the one with an electromagnetic control predetermined current through the electromagnet of the pressure shoe evokes. The same applies to the conceivable implementation pneumatic or hydraulic drives.

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 grinders of the type mentioned have the knowledge brought that even the very sophisticated belt grinders of the known type can still be improved.

Ausgehend von der generellen Problemstellung, bekannte Bandschleifmaschinen 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 belt grinders to improve the grinding result, According to the invention, the belt sander is the beginning mentioned type characterized by a the adjustment of the pressure shoe sensing detector arrangement and an evaluation device to influence the pressure control depending from the sensed adjustment of the pressure shoe.

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

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 pressing force by the pressure device the pressure shoe with a presses the specified pressure force towards the workpiece, however, this via the intermediate, endlessly circulating Sanding belt. With a thinner workpiece, the pressure shoe clearly adjusted more than for a thicker workpiece. There the sanding belt between the pulleys is endless the greater deflection of the grinding belt also a higher one Counterforce due to the necessary belt tension of the grinding belt, and not just because of the counterforce of a resilient bearing a deflection roller of the grinding 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 neighboring one Takes pulley. In a preferred embodiment The invention can therefore be changed in the evaluation device the counterforce of the sanding belt depending on the Deflection of the grinding belt must be entered so that by the Measurement of the deflection by measuring the adjustment of the Pressure shoe the higher counterforce by a correspondingly higher Contact pressure can be compensated. As a result, 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 displacement-force characteristic of the pressure device. The one with a medium deflection of an electromagnet as a pressure device by a given excitation current generated pressure force changes at a lower or increased deflection, i.e. adjustment of the pressure shoe. By detecting the adjustment of the pressure shoe according to the invention it is possible to change the pressure force accordingly, if the displacement-force characteristic of the pressure device is in the evaluation device what can be entered manually, but also in advance Operation can be done by measuring the pressure force.

Besondere vorteilhafte Anwendungsfälle für die vorliegende Erfindung ergeben sich bei Bandschleifmaschinen derart, 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.Particular advantageous applications for the present invention arise in belt grinders such as one Large number of side by side, one on the same Pressure shoes acting on the abrasive belt, a conveyor for conveying the workpiece relative to the Pressure bar and a detection device for the contour of the Workpiece and a control for switching on and off of the pressure shoes as a function of the signal from 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 possible reduction that is advantageous in this case the pressing force in the edge region of the workpiece can be done according to the invention make sense to adjust pressure shoes, in particular in the edge area 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 on never a higher grinding action in sensitive areas 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 also allows such pressure shoes, which for Grinding the workpiece itself is not needed because of it lie just outside the contour of the workpiece, at least partially to adjust to achieve that the sanding belt not on the pressure shoe that is just on the edge of the workpiece is still effective, a relatively high curvature - and therefore one relatively high drag - that trains to an unwanted Reduction of the contact pressure in this area would result. By adjusting what is no longer required for grinding adjacent pressure shoe in the direction of the workpiece the edge pressure shoe required for grinding finds practically that same essentially linear course of the grinding belt like the inner 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 exemplary embodiment shown schematically in the drawing. Show it:
Figure 1 -
a schematic arrangement of an electromagnetically operated pressure shoe, which acts on a rotating sanding belt, with a slight adjustment of the pressure shoe (thick workpiece);
Figure 2 -
a representation of Figure 1 with a large adjustment of the pressure shoe (thin workpiece);
Figure 3 -
a schematic representation of the adjustment of pressure shoes according to the prior art;
Figure 4 -
a schematic representation of the pressure shoes on the edge region of a workpiece according to an embodiment of the invention;
Figure 5 -
a schematic representation of the adjustment of pressure shoes on the edge region of a workpiece according to a further 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 shows a sanding belt 1, the endless around pulleys 2 is guided, two of which are shown in Figure 1 are. A pressure shoe 3 is arranged between the deflection rollers, with the help of an electromagnet 4 as a pressure device can be pressed against the grinding belt 1 between the deflection rollers 2 is. The pressure shoe 3 projects with a shaft 5 into the electromagnet 4 and is passed through by a predetermined current 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.A permanent magnet 6 is mounted on the pressure shoe 3, which together with a stationary on the housing of the electromagnet 4th held sensor 7, which is a magnetostrective sensor or Hall sensor can be as a 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 opposes the deflection movement of the sanding belt 1 caused by the pressure shoe 3 out of the straight connection between the two deflection rollers 2 shown, a counterforce F R , which, as the parallelogram of forces shown in FIG. 1 shows, depends on the size of the two from 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. Given the same magnitude of the forces F 1 , F 2 , the small deflection shown in FIG. 1 produces only a small counterforce F R , while the strong adjustment of the pressure shoe 3 shown in FIG. 2 and the large deflection of the sanding belt 1 associated therewith between the Deflection rollers 2 a significantly greater counterforce F R arises. The degree of deflection of the sanding belt 1 or the adjustment of the pressure shoe 3 is measured by the detector arrangement 6, 7 and used in an evaluation device (not shown) for generating a higher contact pressure compensating the higher counterforce F R , so that the pressure acting on the workpiece resulting force can be the same in both cases.

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-force characteristic of Electromagnet 4 depending on the adjustment path of the pressure shoe 3. In this regard too, the output signal of Detector arrangement 6.7 can be controlled compensation.

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 adjustment of pressure shoes 3 which has been customary up to now for a workpiece 8 which is transported under the pressure shoes 3 and the sanding belt 1. All pressure shoes 3 which are in alignment with the contour of the workpiece 8 are fed in for grinding, that is to say 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 only equipped 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 FIG. 4, in the situation according to FIG. 3, the sliding edge pressure shoe 3 is further adjusted to the position S 2 , but the adjacent pressure shoe, however, is adjusted to a position S 1 which is between the rest position S 0 and the grinding position S 2 . This adjustment is possible according to the invention by the position detection of the pressure shoes 3. The adjustment of the pressure shoe 3 which is not required for the grinding process to the position S 1 reduces that in the form of a counterforce due to the deformation of the grinding belt 1 on the grinding edge pressure shoe (position S 2 ).

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 FIG. 5, the pressure shoe 3 which is adjacent to the grinding edge pressure shoe 3 and is no longer required for grinding is also moved into position S 2 , that is to say into position S 2 of the grinding edge -Pressure shoe 3 taken to relieve the grinding edge pressure shoe of all reaction forces of the sanding 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 detector arrangements sensing the adjustment of the pressure shoes 3 6.7 realizable. With a mere control the pressing force F could not achieve this result.

Claims (5)

Bandschleifmaschine mit einem endlos um Umlenkrollen (2) geführten Schleifband (1), einem Druckschuh (3) zum Drücken des Schleifbandes (1) gegen ein Werkstück (8) mittels einer Andruckvorrichtung (4) und einer Andrucksteuerung, mit der eine Andruckkraft einstellbar ist, gekennzeichnet durch eine die Verstellung des Druckschuhs (3) sensierende Detektoranordnung (6, 7) und eine Auswerteeinrichtung zur Beeinflussung der Andrucksteuerung in Abhängigkeit von der sensierten Verstellung des Druckschuhs (3).Belt sanding machine with an endless sanding belt (1) guided around deflection rollers (2), a pressure shoe (3) for pressing the sanding belt (1) against a workpiece (8) by means of a pressing device (4) and a pressing control with which a pressing 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). Bandschleifmaschine nach Anspruch 1, dadurch gekennzeichnet, daß in die Auswerteeinrichtung eine Änderung der Gegenkraft (FR) des Schleifbandes (1) in Abhängigkeit von der Auslenkung des Schleifbandes (1) eingebbar ist.Belt grinding machine according to claim 1, characterized in that a change in the counterforce (F R ) of the grinding belt (1) depending on the deflection of the grinding belt (1) can be entered into the evaluation device. Bandschleifmaschine nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß in die Auswerteeinrichtung die Kraft-Weg-Kennlinie der Andruckeinrichtung (4) eingebbar ist. Belt grinding machine according to claim 1 or 2, characterized in that that in the evaluation device, the force-displacement characteristic the pressure device (4) can be entered. Bandschleifmaschine nach einem der Ansprüche 1 bis 3 mit einer Mehrzahl von nebeneinander angeordneten, einen auf dasselbe Schleifband (1) einwirkenden Druckbalken bildenden Druckschuhen (3), einer Fördereinrichtung zum Fördern des Werkstücks (8) relativ zum Druckbalken und einer Detektionseinrichtung für die Kontur des Werkstücks (8) und einer Steuerung zur Wirksam- und Unwirksamschaltung der Druckschuhe (3) in Abhängigkeit von dem Signal der Detektionseinrichtung, gekennzeichnet durch eine Begrenzung der Verstellung von Druckschuhen (3), insbesondere im Randbereich eines Werkstücks (8), durch eine detektierte Verstellung wenigstens eines Druckschuhs (3) in einem anderen Bereich des Werkstücks (8).Belt grinder according to one of claims 1 to 3 with a plurality of side by side, one on the same abrasive belt (1) acting pressure beam Pressure shoes (3), a conveyor for conveying of the workpiece (8) relative to the pressure beam and a detection device for the contour of the workpiece (8) and a control for the activation and deactivation of the Pressure shoes (3) depending on the signal of the detection device, characterized by a limitation the adjustment of pressure shoes (3), especially in Edge area of a workpiece (8), by a detected Adjustment of at least one pressure shoe (3) in one other area of the workpiece (8). Bandschleifmaschine nach einem der Ansprüche 1 bis 4 mit einer Mehrzahl von nebeneinander angeordneten, einen auf dasselbe Schleifband (1) einwirkenden Druckbalken bildenden Druckschuhen (3), einer Fördereinrichtung zum Fördern des Werkstücks (8) relativ zum Druckbalken und einer Detektionseinrichtung für die Kontur des Werkstücks (8) und einer Steuerung zur Wirksam- und Unwirksamschaltung der Druckschuhe (3) in Abhängigkeit von dem Signal der Detektionseinrichtung, dadurch gekennzeichnet, daß mit der Auswerteeinrichtung eine zumindest teilweise Verstellung eines zum Schleifen des Werkstücks (8) an sich nicht benötigten Druckschuhs (3) steuerbar ist.Belt grinder according to one of claims 1 to 4 with a plurality of side by side, one on the same abrasive belt (1) acting pressure beam Pressure shoes (3), a conveyor for conveying of the workpiece (8) relative to the pressure beam and a detection device for the contour of the workpiece (8) and a control for the activation and deactivation of the Pressure shoes (3) depending on the signal of the detection device, characterized in that with the Evaluation device an at least partial adjustment one not required for grinding the workpiece (8) Pressure shoe (3) is controllable.
EP99114307A 1998-07-28 1999-07-21 Belt grinding machine Expired - Lifetime EP0976495B1 (en)

Applications Claiming Priority (2)

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DE19833881A DE19833881C1 (en) 1998-07-28 1998-07-28 Belt grinding machine with endless grinding band running over deflector rollers
DE19833881 1998-07-28

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

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CN (1) CN1173802C (en)
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DE (3) DE19833881C1 (en)
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JP6488775B2 (en) * 2015-03-09 2019-03-27 東洋製罐グループホールディングス株式会社 Diamond surface polishing method and apparatus for carrying out the same
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CN111571391B (en) * 2020-05-28 2022-03-15 广东南粤建筑工程有限公司 Sander for laying prefabricated slab
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ES2196686T3 (en) 2003-12-16
ATE239585T1 (en) 2003-05-15
DK0976495T3 (en) 2003-07-21
EP0976495B1 (en) 2003-05-07
JP4949544B2 (en) 2012-06-13
PT976495E (en) 2003-09-30
US6290570B1 (en) 2001-09-18
CN1173802C (en) 2004-11-03
DE19833881C1 (en) 1999-10-21
DE29910147U1 (en) 1999-08-12
CA2278912C (en) 2006-09-12
JP2000042892A (en) 2000-02-15
CA2278912A1 (en) 2000-01-28
CN1246401A (en) 2000-03-08
DE59905417D1 (en) 2003-06-12

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