EP1541285A1 - Flow path sanding machine for processing a workpiece surface and method therefor - Google Patents

Abstract

The grinder contains grinding tools (22) which are moved continuously along an oval or elliptical orbiting path (28). The grinder contains a grinding station (14) with at least two rotary grinding tools, especially disc wheel or roll grinders.

Description

The present invention relates to a continuous grinding machine for Machining a workpiece surface with a grinding station with at least two rotating grinding tools, especially plate or Roll grinder and a method for this.

In the manufacture of furniture parts, room doors or the like must the individual components superficially after machine processing be sanded to remove any existing burrs and / or to smooth the surface and of fine wood fibers too to free. Only such a smooth surface can be painted properly become. The same applies to workpieces that have been pre-painted. Furthermore Continuous grinding machines are used for deburring metal workpieces used.

Above all, if on itself flat surfaces elevations, depressions or have recesses are in such continuous grinding machines individual workpieces on a transport device on one or more grinding stations along, with the grinding stations have plate and / or roll grinders on which abrasive paper is mounted like a lamella. The plate or roll grinders work on this the workpiece, in particular the profiling, from different Angle to break any existing edges and / or burrs remove.

From DE 100 35 977 A1, for example, it is known on a continuous grinding machine both one over the entire workpiece width leading Abrasive blade roller, as well as a number of abrasive disc plates (also Disc grinder called) to integrate. Here is the grinding lamella roller grind the workpiece surface in the transport direction while the Disc grinder rotate about its vertical axis and thus the workpiece surface edit from different directions. The plate grinders are oscillating in addition to the rotation transverse to the feed direction moves to make each point of the workpiece surface different To edit angles.

From DE 196 11 932 A1 is a grinding station for a continuous grinding machine known, in which at a main axis of rotation four secondary axes of rotation are provided, wherein at each secondary rotation axis four Roll grinder are mounted. The roll grinders rotate around its horizontal axis and both the major and minor axes of rotation the roll grinders rotate again. This will be a diffused movement of the respective roll grinder over the workpiece surface achieved with the goal of making every point of the workpiece surface To grind as different angles as possible to a sufficient Sand also difficult edges, profiles or other patterns enable.

From WO 99/22905 a grinding station is known in which at a Hochachse a number of roll grinders is mounted, the Roll grinder on the one hand rotate about its horizontal axis and on the other hand rotate around the vertical axis.

In all the aforementioned continuous grinding machines, the workpiece surface from the individual grinding tools from different directions and angles created. The processing of the workpiece surface is done not really even. So there are areas of the workpiece surface which is predominantly captured at a certain angle be or with a high or low relative speed be edited, resulting in different grinding results and too leads to different wear of the grinding tool. By the oscillation movement transverse to the transport direction arises in conjunction with the rotation of the grinding tool and the movement of the workpiece a relative movement of the grinding tools relative to the workpiece surface, locally very uneven. In addition, that is the then wear unevenly heavily individual grinding tools, if the workpiece to be machined is not over the entire machining width is enough, but only a part of this processing width recorded. so However, unevenly worn abrasive tools affect that Grinding result of the subsequent workpiece surfaces, because of the different wear different grinding results within a workpiece can be achieved.

Based on this, the present invention is based on the object to provide a continuous grinding machine of the type mentioned, with a uniform machining of the workpiece surface and a uniform wear of the grinding tools is achieved.

As a technical solution to this problem, a continuous grinding machine according to the invention according to the features of claim 1 or the Characteristics of claim 5 proposed. Advantageous developments This continuous grinding machine are the respective subclaims refer to.

A trained according to this technical teaching continuous grinding machine has the advantage that by the orbit a defined movement the grinding tools is achieved over the workpiece surface, wherein The grinding tools are always guided evenly over the workpiece surface be, allowing a uniform machining of the workpiece surface and achieved a uniform wear of the grinding tools becomes.

Another advantage is that this defined movement of Machine setters can be used to make individual workpieces according to the profiling so to place on the conveyor belt, that they are optimally captured by the grinding tools, with what thorough sanding is ensured.

In a preferred embodiment, the orbit is dimensioned that in the area of the expected workpiece surface only part of the orbit is located while another part of the Orbit is arranged outside the workpiece surface. there the orbit is advantageously designed so that those sections the orbit, in which the grinding tools are linear or move almost linearly over the expected workpiece surface, in particular above the conveyor, be arranged while those Subregions of the orbit where a strong curvature occurs or in which the workpieces are only being transported, outside of expected workpiece surface are arranged. This will achieve that the grinding tools exclusively or almost linear over move the workpiece surface. It can be left open whether the grinding tools along or transversely to the transport direction of the Workpieces or at an angle between + 45 ° and -45 ° to the transport direction move. In any case, by the linear motion in the Area of the grinding process over the entire workpiece surface achieved a uniform movement of the grinding tools.

This has the advantage that the relative speed of the tools opposite the workpiece surface is always the same, so that a uniform Grinding process is achieved. Another advantage is that By this uniform grinding process, a uniform Abrasion of the grinding tools takes place, which on the one hand the quality of Increased grinding result and on the other hand to a more economical Use with better utilization of the grinding tools leads.

In a preferred embodiment, the grinding station comprises a corresponding the orbit trained guide rail, on the one Number of slides are guided, in turn, each a grinding tool is appropriate. This has the advantage that thereby a cost-effective and reliable guidance of the grinding tools is achieved. Also, by using a guide rail carriage combination a low-friction and trouble-free locomotion of the grinding tools allows.

It has been found to be advantageous, this slide over a Connecting rod with a forced-driven chain, so that the driven via an electric motor chain pulls the carriage.

In a particularly preferred embodiment is on the guide rail a sprocket held with a mounted on the grinding tool Gear interacts, leaving the grinding tool around its vertical axis rotates, as long as the carriage is moved forward. Here is speed the grinding tools to the rotational speed of the grinding tools coupled along the orbit. This will be cheaper Way a rotation of the grinding tool reaches around its vertical axis, so that the grinding tool the workpiece surface not only across the Transport direction grinds, but by the rotational movement in any other angles grinds. By such an indirect drive The grinding tools can handle the entire grinding station with a single Drive motor operated, which in turn reduces the manufacturing costs lowers.

In an alternative embodiment, each grinding tool is over driven by its own electric motor. This has the advantage that the Speed of the grinding tools independent of the rotational speed the slide can be adjusted to the orbit. As well The grinding tools can be operated at much higher speeds become. It follows that with a single continuous grinding machine both wood or wood substitute (low speed), as well Metal (high speed) can be edited. This increases the range of applications and thus the economy of the continuous grinding machine according to the invention.

Another advantage is that due to the higher speed of the Grinding tools completed the entire grinding process faster is what leads to increased throughput.

In a preferred embodiment, the grinding tools are individual controllable. This has the advantage that, depending on the required grinding conditions the grinding tools switched on or off differently, or can be adjusted in their speed or in the desired Direction of rotation can be operated, resulting in an optimal adaptation of the Grinding process to the requirements of the workpiece allows.

In a further preferred embodiment are at the grinding station only disc sander attached, because this in the all-round editing of workpieces offer advantages.

In another preferred embodiment are at the grinding station only roll grinder attached, because this a more aggressive processing allow. The latter is especially when deburring metal parts advantageous.

In yet another preferred embodiment are at the grinding station both disc and roll grinder provided. It can the roll grinder with its axis of rotation in the feed direction, transverse to the feed direction or at any angle, in particular 45 °, be arranged to the feed direction. This has the advantage that the Grinding station can be adapted to the workpieces to be ground, for an optimal grinding result with as even wear as possible to reach the grinding tools.

Another advantage is that with the individual arrangement the grinding tools and a desired grinding pattern can be achieved can. This micrograph can be in the direction of the set angle of the angle grinder or else be diffuse, if different Abrasive tools are used or the grinding tools are aligned differently.

In a most preferred embodiment, in the grinding station attached three identical grinding tool groups, each Grinding tool group a disc sander, one in the feed direction, a transversely to the feed direction and a 45 ° attached to the feed direction Roll grinder includes. This will make the pits and elevations, as well as the edges and edges of the workpiece of many sanded different sides, leaving a thorough editing of the workpiece.

Another advantage is that when such a thorough and comprehensive processing the transport speed of the workpiece can be increased without the processing quality suffers. Latter leads to increased throughput and increased efficiency the continuous grinding machine according to the invention.

Fig. 1

eine Draufsicht auf eine erste Ausführungsform einer Schleifstation einer erfindungsgemäßen Durchlaufschleifmaschine;

Fig. 2

eine Frontansicht der Schleifstation gemäß Fig. 1;

Fig. 3

eine Ausschnittsvergrößerung in Frontansicht eines Teils der Schleifstation gemäß Fig. 2, entsprechend Linie III in Fig. 2;

Fig. 4

eine Ausschnittsvergrößerung eines Teiles einer zweiten Ausführungsform einer Schleifstation einer erfindungsgemäßen Durchlaufschleifmaschine;

Fig. 5

eine Draufsicht auf eine dritte Ausführungsform einer Schleifstation einer erfindungsgemäßen Durchlaufschleifmaschine;

Fig. 6

eine Ausschnittsvergrößerung in Frontansicht eines Teiles der Schleifstation gemäß Fig. 5;

Fig. 7

eine Draufsicht auf die Durchlaufschleifmaschine gemäß Fig. 5, jedoch mit schräg angebrachten Walzenschleifern;

Fig. 8

eine Draufsicht auf die Durchlaufschleifmaschine gemäß Fig. 5, jedoch mit quer angebrachten Walzenschleifern;

Fig. 9

eine Draufsicht auf die Durchlaufschleifmaschine gemäß Fig. 5, jedoch mit gemischt angebrachten Walzenschleifern;

Fig. 10

eine Draufsicht auf eine vierte Ausführungsform einer Schleifstation einer erfindungsgemäßen Durchlaufschleifmaschine.

Further advantages of the grinding machine according to the invention will become apparent from the accompanying drawings and the embodiments described below. Likewise, according to the invention, the above-mentioned features and those which are still further developed can be used individually or in any desired combinations with one another. The mentioned embodiments are not to be understood as an exhaustive list, but rather have exemplary character. Show it:

Fig. 1

a plan view of a first embodiment of a grinding station of a continuous grinding machine according to the invention;

Fig. 2

a front view of the grinding station of FIG. 1;

Fig. 3

an enlarged detail in front view of a portion of the grinding station of Figure 2, according to line III in Fig. 2.

Fig. 4

an enlarged detail of a part of a second embodiment of a grinding station of a continuous grinding machine according to the invention;

Fig. 5

a plan view of a third embodiment of a grinding station of a continuous grinding machine according to the invention;

Fig. 6

an enlarged detail in front view of a part of the grinding station of FIG. 5;

Fig. 7

a top view of the continuous grinding machine of Figure 5, but with obliquely mounted roll grinders.

Fig. 8

a top view of the continuous grinding machine of Figure 5, but with transverse roll grinders.

Fig. 9

a top view of the continuous grinding machine of Figure 5, but with mixed mounted roll grinders.

Fig. 10

a plan view of a fourth embodiment of a grinding station of a continuous grinding machine according to the invention.

FIGS. 1 to 3 show a first continuous grinding machine, when on a conveyor 110 workpieces 112 with a flat Workpiece surface are passed by a grinding station 114. The workpieces 112 are usually doors, boards or other components of a piece of furniture or the like made of wood or Wood substitute, wherein the substantially flat or relief-like Evenly sanded, polished or roughened surfaces. The Surface of these workpieces 112 must be according to their mechanical Machining be sanded to burrs and protruding wood fibers too remove and smooth the surface. It should also wells or elevations such as milled cuts, attached strips or the like, which transversely, longitudinally or at any angle to Feed direction are aligned, ground as evenly as possible become. The workpieces can also be metal parts, have the millings, holes, openings or recesses.

The grinding station 114 comprises an electric drive 116 and a deflection roller 118, wherein about the electric drive 116 and the guide roller 118 a circulating chain 120 is guided. This chain 120 pulls a number of Abrasive tools, in the embodiment shown here as a disc sander 122 are formed. Each disc sander 122 is workpiece side equipped with a number of sanding blades and sanding station side the grinding tool 122 has a vertical axis 124. The disc sander 122 is with its vertical axis 124 on a movable carriage 126 held and can via the carriage 126 along an orbit 128 are moved. The orbit 128 is as a guide rail 130 realized that holds the respective carriages 126 and along the orbit 128 slidably leads. About a pull rod 132 is the carriage 126 connected to the chain 120, wherein the pull rod 132 both at the Chain 120, as well as the carriage 126 is pivotally mounted.

On the vertical axis 124, a gear 134 is mounted, which in a mounted on the inside of the guide rail 130 sprocket 136th intervenes. By this sprocket 136-gear 134 combination is the Grinding tool 122 rotates about its vertical axis 124 as soon as the disc sander 122 is moved. This construction makes it easier Way and only with a single electric drive 116 possible, the Schleif.werkzeuge 122 along the orbit 128 to move.

The orbit 128 is composed of four sections, and although from a first working section 140, a second working section 142, a first fetching section 144 and a second fetching section 146. The two working sections 140, 142 are the same as the two Verholabschnitte 144, 146, each opposite arranged. The actual grinding process takes place exclusively in the Working sections 140 and 142, which are beyond the expected Workpiece surface are located. The work sections are sufficient 140 and 142 each over the entire width of the conveyor belt 110th Outside the conveyor belt 110, the Verholabschnitte 140 and 146 arranged and serve only to the fact that the respective disc sander 122 from the first working section 140 in the second working section 142 and vice versa.

The working sections 140 and 142 are linear, that is rectilinear executed and run exactly transversely to the transport direction of the workpieces 112. This arrangement of the disk grinder 122 ensures that the disc grinder 122 evenly over the entire workpiece width extend, regardless of how wide the individual workpiece actually is. Furthermore, this ensures that the disc grinder 122 at a uniform speed over the workpieces 112 move so that the machining of the workpiece surface is perfect evenly. Due to this embodiment of the grinding station 114 is an optimal grinding of the workpiece surface transverse to the transport direction achieved and by the rotation of the disc grinder 122 to the Vertical axis 130, the workpiece 112 is also among the most diverse Angles ground. It has proved to be advantageous, the Distance between two adjacent disc grinders 122 in dependence the feed direction of the workpieces 112 set so that really each point of the workpiece surface from a grinding tool 122 is swept over.

The entire grinding station is height-adjustable via a lifting device, to be able to process workpieces of different sizes.

In Fig. 4 is a second embodiment of a continuous grinding machine according to the invention shown, different from the first embodiment only differs by the nature of the drive of the disc grinder 222. In this embodiment, each disc sander 222 has a own electric motor 248, the vertical axis 224 of the disc sander 222 drives. In an embodiment not shown here is doing each disc sander 222 individually controlled.

To power the electric motors 248 is in the inside of the Guide rail 230 a not shown here, open power supply line 250 attached. Corresponding to this is the electric motor 248 a sliding contact 252 provided by the disc sander 222 is entrained and applied to the power supply line 250. about this sliding contact 252, the electric motor 248 at any time be powered.

In a not shown here, preferred training is in the Guide rail additionally a control line and the electric motor one For this purpose, corresponding control device attached so that everyone Electric motor of each grinding plate can be controlled individually. This makes it even easier, the individual grinding tools individually to control.

FIGS. 5 and 6 show a third embodiment of a device according to the invention Continuous grinding machine shown in which at the grinding station 314 held grinding tools are designed as a roll grinder 323. These roll grinders 323 are driven by an electric motor 348 and rotate about their axis of rotation 354. In the illustration according to FIG Fig. 5, the roll grinder 354 are arranged in the feed direction, the is called, the rotation axis 354 is perpendicular to the direction of movement of Roll grinder 323 (direction of rotation) aligned. This runs the Rotation axis 354 coaxial with the transport direction of the workpieces 312nd

The electric motor 348 is held in a frame 356, on which also the Roll grinder 323 is attached, wherein the roll grinder 323 via a V-belt 358 is driven by the electric motor 348. The frame 356 is held by a screw 360 on the carriage 326, which at the Guide rail 330 is guided. Parallel to the guide rail 330 is a circumferential power rail 350 mounted over which the necessary power is transported to the electric motor 348. It is the Power supply rail 350 as a non-contact power transmission rail educated.

In Figs. 7 to 9 is again the continuous grinding machine according to the Fig. 5 and 6 shown, wherein the roll grinder 323 positioned differently here are. So are the roll grinder 323 of FIG. 7 with its axis of rotation arranged at an angle of 45 ° to the feed direction, while the roll grinder 323 as shown in FIG. 8 transversely to the feed direction are arranged. In Fig. 9, the roll grinders are alternately in Feed direction, 45 ° to the feed direction and transverse to the feed direction arranged. In each case three differently mounted roll grinders form 323 a grinding tool group, wherein at the grinding station 314 are mounted such three abrasive tool groups.

The individual roll grinder 323 can be easily from the be moved to a different position in which the screw 360 is solved and the frame 358 is rotated accordingly before the Screw 360 is tightened again .. So the roll grinder 323 be mounted in any position.

In Fig. 10, a fourth embodiment is shown, which differs from the in Fig. 9 illustrated embodiment differs only by that here a grinding tool group in addition to the three different attached roll grinders 423 nor a disc sander 422 having.

It is understood that other combinations and arrangements of Abrasive tools are possible, even if these are not explicit are shown.

The grinding stations 114, 214, 344 shown here can be replaced by further ones Grinding stations 114, 214, 314 and optionally, for example, with itself over the entire workpiece width extending roll grinders, supplemented become. Also, arranged transversely to the feed direction spindles with rotating grinding lamella roller bodies or transversely or longitudinally to Feed direction arranged belt sanding units or transversely to the feed direction arranged soft coated with sandpaper roll body be provided.

In another, not shown embodiments, the orbit arranged oval or elliptical, here again the areas strong curvature outside the conveyor belt are arranged. With such an oval or elliptical orbit the achieved above benefits in an analogous manner.

In yet another embodiment, not shown here are the Working sections at an angle between 45 ° and 135 ° to the transport direction arranged the workpieces. Depending on the design of the workpiece surface and their profiling can be such an angled arrangement lead to a further optimized grinding result.

In yet another embodiment, not shown here takes place the Drive the grinding tools via compressed air.

During the actual grinding process, it is possible the individual Rotate abrasive tools at different speeds or single To operate grinding tools in the opposite direction. This depends in the individual case of the workpiece to be ground in each case.

It has been shown that wood or wood substitute preferably with Grinding tools at a speed of 100 to 500 rpm. to grind while metal is preferably at a speed of 1000 to 3000 U / min. To grind is the speed of rotation of the grinding tools along the orbit preferably between 1 m / min. and 10 m / min. should be. It has also proved to be advantageous, the Grinding station for processing wood or wood substitute majority equipped with disc grinders while for a processing of Metal majority roll grinders are beneficial. A workpiece out Wood or wood substitute is placed on the conveyor at a transport speed between 1 m / min. and 20 m / min. moved while a Workpiece made of metal with a transport speed of 0.5 m / min is moved to 10 m / min.

It has also proved to be advantageous, the rotational speed about four times as high as the transport speed of the Workpieces to a sufficient sweeping of the grinding tool to reach over the respective workpiece.

So that the roll grinder turned without problems at the grinding station It has proved to be advantageous, the roll grinder square so that the diameter (including abrasive) corresponds approximately to the width of the roller.

The abrasives are slats of sandpaper on the grinding tools appropriate. Preferably, the slats lean on their Back on bristles or tufts of bristles on which the lamella support.

Furthermore, for machining metallic workpieces pure abrasive bristles be attached to the plate or roll grinder, wherein the abrasive bristle is made of an abrasive Plastic bristle is formed.

LIST OF REFERENCE NUMBERS

110

conveyor belt

112 312

workpiece

114 214 314

grinding station

116

electric drive

118

idler pulley

120

Chain

122 222 422

Tellerschleifer

323 423

roll grinder

124 224

vertical axis

126 326

carriage

128

orbit

130 230 330

guide rail

132

pull bar

134

gear

136

sprocket

140

working section

142

working section

144

Verholabschnitt

146

Verholabschnitt

248 348

electric motor

250 350

Stromversorgungsl.

252

sliding contact

354

axis of rotation

356

frame

358

fan belt

360

screw

Claims (16)

Continuous grinding machine for processing a workpiece surface with a grinding station with at least two rotating grinding tools, in particular plate or roll grinder, wherein the grinding tools are driven continuously along an orbit,
characterized in that the orbit (28) alternately has two working sections (40, 42) and two Verholabschnitte (44, 46). Continuous grinding machine according to claim 1,
characterized in that the grinding tools (122, 222, 323, 422, 423) are moved linearly in the working sections (140, 142). Continuous grinding machine according to one of the preceding claims,
characterized in that the working sections (140, 142) in the region of the expected workpiece surface and the Verholabschnitte (144, 146) are arranged outside of the expected workpiece surface. Continuous grinding machine according to one of the preceding claims,
characterized in that the working portion (140, 142) at an angle α between 45 ° and 135 °, preferably 90 ° to the transport direction of the workpieces (112, 312) is arranged. Continuous grinding machine for processing a workpiece surface with a grinding station with at least two rotating grinding tools, in particular plate or roll grinder, wherein the grinding tools are driven continuously along an orbit,
characterized in that the orbit is oval or elliptical. Continuous grinding machine according to claim 5,
characterized in that portions of the orbit having a large radius or rectilinear portions in the region of the expected workpiece surface and portions of the orbit having a narrow radius are located outside the expected workpiece surface. Continuous grinding machine according to one of the preceding claims,
characterized in that the grinding station (112, 312) comprises a corresponding guide rail (130, 230, 330) formed along the orbit (128), along which the grinding tools (122, 222, 323, 422, 423) by means of slides (126, 326 ). Continuous grinding machine according to claim 7,
characterized in that the carriage (126, 326) is connected by a pull rod (132) with a rotating and positively driven chain (120) and is pulled by this. Continuous grinding machine according to one of claims 7 or 8,
characterized in that on the guide rail (130), preferably inside, a sprocket (136) is mounted, which cooperates with a gear (134) mounted on the grinding tool (122), so that the grinding tool (122) about its vertical axis (124) rotates, as long as the carriage (122) moves forward. Continuous grinding machine according to one of the preceding claims,
characterized in that a roll grinder (323, 423) and / or a disc sander (422) arranged transversely to the feed direction and / or arranged in the feed direction and / or a 45 ° to the feed direction form a grinding tool group, wherein at a grinding station (314) two to twelve grinding tool groups are arranged. Continuous grinding machine according to one of claims 1 - 7 or 10,
characterized in that each grinding tool (222, 323) via its own electric motor (248, 348) is set in rotation. Continuous grinding machine according to one of the preceding claims,
characterized in that the grinding station (114, 214, 314) is height adjustable. Method for processing a workpiece surface with a continuous grinding machine according to one of the preceding claims,
characterized in that the rotational speed and / or the direction of rotation of a grinding tool or group of grinding tools is controlled individually. Method for processing a workpiece surface with a continuous grinding machine according to one of the preceding claims, in particular according to claim 13,
characterized in that the rotational speed of a grinding tool about 2 times to 8 times, preferably 4 times as large as the feed rate of the workpiece. Method for processing a workpiece surface with a continuous grinding machine according to one of the preceding claims, in particular according to one of claims 13 or 14,
characterized in that the grinding tools are driven only in the working section. Method for processing a workpiece surface with a continuous grinding machine according to one of the preceding claims, in particular according to one of claims 13 to 15,
characterized in that the workpiece is moved back and forth by means of a conveyor belt.

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