WO2015070269A1

WO2015070269A1 - Device for machining the edges of flat workpieces

Info

Publication number: WO2015070269A1
Application number: PCT/AT2014/000204
Authority: WO
Inventors: Leopold Mader
Original assignee: Lisec Austria Gmbh
Priority date: 2013-11-14
Filing date: 2014-11-14
Publication date: 2015-05-21
Also published as: AT515011B1; EP2958709A1; AT515011A1

Abstract

A grinding disk (6) which is moved along the edge (4) of the glass pane (1) is used during the production of bevels (11, 12) on the edge (4) of a workpiece, such as a glass pane (1). The borders (A, B) of the edge (4) of the glass pane (1) are machined so as to remove material using a tool which has active areas (9, 10) on the tool circumferential surface, thereby forming the bevels (11, 12). When the flat, curved, or waved end face (5) of the edge (4) of the glass pane (1) is inclined relative to the central plane of the glass pane (1), the tool is moved along the edge (4) of the glass pane (1) in an aligned manner such that substantially equally sized bevels (11, 12) are formed. For this purpose, the tool is designed such that the plane of symmetry (13) of the active areas (9, 10) of the tool does not lie on the central plane of the glass pane (1), i.e. is at a distance from the central plane, and the active areas (9, 10) are arranged at a substantially equal distance to the borders (A, B) of the edge (4) of the glass pane (1). Devices are associated with the grinding disk (6), which detect the position of the boarders (A, B) of the edge (4) of the workpieces (1). The devices for detecting the position of the borders (A, B) are tasters (20, 21) which rest on the boarders (A, B) of the edges (4) of the workpiece (1) under elastic prestress and that the tasters (20, 21) are aligned to the surfaces (2, 3) of the workpiece (1) at an angle of approximately 45°.

Description

Device for processing the edges of flat workpieces

The invention relates to a device having the features of the introductory part of claim 1.

In the device of EP 1 488 886 B1, two sensors are provided for detecting the position of the edges at the edges of the glass sheet. As can be seen from paragraphs [0060] to [0066] of EP 1 488 886 B1, a movably held roller is provided as a follower roller, which rests against the edge of the glass pane (see Fig. 7 of EP 1 488 886 B1). The role is assigned to sensors.

The sensor detects movements of the roll transversely to the plane of the

Glass pane. The sensor detects movements of the roller in the direction of the plane of the glass pane.

The sensors are connected to the machine control to orient the mutual alignment of the grinding wheel and the glass sheet, taking into account the position of the roll, so as to create (substantially) identical chamfers on both edges of the edges of the glass sheet.

From EP 1 488 886 Bl is thus a device with the

Characteristics of the preamble of claim 1 known.

Definitions of terms used herein:

"Tool": A tool used to grind the edges of edges of a flat workpiece, e.g. a glass sheet can be machined to produce chamfers, in particular a grinding wheel.

"Effective areas": The areas of the tool that erode away at the edge of a flat workpiece. The effective ranges of a grinding wheel can be at an angle to each other, for example at right angles, standing areas of a circumferential surface, which is formed by straight generatrices (Figures 1 and 7), or a portion of a concavely curved peripheral surface formed by an arcuate generatrix (Figure 6). Between effective ranges formed by straight generators on the

Peripheral surface of a grinding wheel can

cylinder jacket-shaped area are (Fig. 7).

"Symmetry plane of the effective ranges": For a grinding wheel, the plane of symmetry of the peripheral surface perpendicular to the axis of the grinding wheel.

"Median plane" of the workpiece, in particular of the glass: the plane in the. Area of the edge where chamfers are generated, located midway between the surfaces of the workpiece.

"Face": The plane, curved or wavy surface of the edge of the workpiece between the edges of the edge of the workpiece

Workpiece (in Fig. 18, the area between the designated A and B edges).

"Angle of the end face of the edge of the workpiece": The angle which a straight line connecting the edges of the edge of the workpiece (straight line between "A" and "B" in Fig. 18) with the workpiece in the region of the edge, on the bevels are generated occupy. If the angle is not a right angle, there is a "crooked end face".

"Size of a chamfer": The size of a chamfer is understood as:

"Bevel height" (AC or BE in Fig. 18), "chamfer width" (CF or EG in Fig. 18) and "chamfer surface" (size of the area bes the edge area, which is removed when creating the chamfer (triangle ACF and triangle BEG in Fig. 18).

"Trimming": generating chamfers on both edges of an edge of a flat workpiece, in particular a glass sheet by removing material, in particular by grinding. "Rough": Roughening of the end face of the edge of a flat workpiece, in particular a glass pane, by grinding. (Roughing the edge of a pane of glass prevents incident light from passing through the face

Disc surface causes unwanted reflections.)

The roughing of an edge of a glass sheet can be done without the same is trimmed in the region of its edge to produce chamfers.

It is possible to have an edge of a flat workpiece,

especially a glass pane, both too rough and to trim. The roughing and trimming can be done with the same tool, directly one behind the other with independent

Tools or done in separate operations. Chamfers can be formed with flat boundary surfaces.

It is also possible to chamfer with convex curved

To create boundary surfaces, where chamfers can pass into the face of the workpiece.

Such convexly curved bevels can be produced, for example, by the edge of a flat workpiece, in particular a glass pane, with the aid of a guided along the edge to be machined grinding wheel with concave curved

"Effective areas" is processed on the peripheral surface.

To produce chamfers, it is also possible to produce grinding wheels with a V-shaped contact surface (comprising two angular "effective ranges"). If, in addition to the production of chamfers, the end face of the edge of a flat workpiece, in particular a glass pane, is too rough, a grinding wheel can be used which has a trapezoidal contact surface (comprising two "effective regions" and a "barrel-shaped" effective region therebetween). If only the end face of a flat workpiece, in particular a glass pane, is too rough, a

Grinding wheel with cylinder-shaped peripheral surface (used as "effective range").

Usually, especially when the sheet-like workpiece is a glass sheet, it is required that the chamfers be at least substantially equal at both edges of edges. It is therefore undesirable that a chamfer on one edge of one edge is substantially larger than the chamfer on the other edge.

The production of substantially equal chamfers is not a problem if the end face of the edge to the plane of the flat workpiece (glass) at a right angle

is aligned. Especially when generated by breaking

Glass sheets, however, often result in end faces that are inclined to the plane of the glass sheet at an angle that deviates from a right angle and that may not be flat but curved and / or corrugated.

The invention has for its object to provide a device in which even when not at right angles to the plane of the workpiece standing face of the edge substantially equal chamfers can be generated.

This object is achieved according to the invention with a device having the features of claim 1.

Preferred and advantageous embodiments of

Device according to the invention are the subject of

Unteranspres.

Unlike the device known from EP 1 488 886 Bl, it is provided in the device according to the invention that the devices for detecting the position of the edges A, B are probes which are elastic at the edges of the edge of the workpiece Pretension and that the buttons are aligned to the surfaces of the workpiece at an angle of 45 °.

Once so is a separate sensing element, such as the role of EP 1 488 886 Bl, dispensable and according to the invention

provided buttons detect because of their orientation

Glass pane easier and more accurate.

In the invention, the tool is aligned with its effective range, in particular with its effective ranges, so that even at an angle of the end faces of the edge of the

Workpiece that is not a right angle ("crooked

The tool is aligned with its active surfaces differently than symmetrically to the edge of the work piece.The tool is aligned so that the symmetry plane between the

Effective areas of the tool with the center plane of the workpiece (glass) does not coincide. The tool becomes

According to the invention aligned so that it is also slate

End surface of the edge of the workpiece at the edges of the edge generates at least substantially equal chamfers.

Further details and features of the invention will become apparent from the following description of preferred embodiments with reference to the drawings. It shows

Fig. 1 shows schematically a grinding wheel and (partially) a

Glass pane on which chamfers are produced,

Fig. 2

to 5 different embodiments of bevels on the edge of a

Glass pane,

Fig. 6 is a grinding wheel with concave curved

Peripheral surface, as it can be used, for example, for producing bevels of FIGS. 3 and 4 or 5,

7 shows a grinding wheel with trapezoidal lateral surface, 8 shows a grinding wheel for roughening the end faces of edges of glass panes with a cylindrical jacket-shaped contact surface;

Fig. 9

to 14 other embodiments of bevels on the edge of

Glass panes,

15 shows the edge of a glass pane with an obliquely inclined ("slate") end face,

16 shows the assignment of a grinding wheel to the glass pane shown in FIG. 15, FIG.

Fig. 17 shows another example of the assignment of a

Grinding wheel to a glass pane according to Fig. 15, Fig. 18 schematically the assignment of a grinding wheel to

a glass pane with an oblique face, Fig. 19, the assignment of a grinding wheel with cylindrical

Umgangsfläche to a glass pane with oblique

Face,

Fig. 20 shows the essential parts of an apparatus for carrying out a method with the invention

Contraption,

Fig. 21 schematically shows further details of an apparatus for carrying out a method with the

device according to the invention,

Fig. 22 shows another embodiment of an inventive

Device and

Fig. 23 schematically shows an arrangement for carrying out a

Method with the device according to the invention.

If in the following while explaining the in the drawings

shown embodiments of a glass sheet is spoken as a sheet-like workpiece, this is not limiting, as with the inventive method and apparatus according to the invention, in principle, other plate-shaped ("flat") workpieces than glass

can be edited. In all depictions, the invention will be described by way of example with reference to an edge 4 of a vertically standing glass pane 1

explained. At the other edges of the glass sheet 1 and a non-perpendicular glass sheet 1 are appropriate conditions.

In the description, the direction of the longitudinal extent of the edge 4 is referred to as the X direction. The direction normal to the surfaces 2 and 3 of the glass sheet 1 (eg, plane of the glass sheet 1) is referred to as the Z direction. A direction perpendicular to the edge 4 of the glass pane 1 is referred to as the Y direction.

When forming curved chamfers (FIG. 3), the

Material removal be driven so far that the end face 5 of the edge 4 of the glass pane 1 disappears and the chamfers merge into each other. It is shown by way of example in FIGS. 4 and 5. In this case we are talking about a "marginal cut".

A grinding wheel 6 with a concave contact surface 8 as a tool has, for example, the shape shown in FIG. 1 with a contact surface 8, which has two active regions 9 and 10 aligned with one another in a V-shaped manner. With the

Grinding wheel 6, the edges of the edge 4 of the glass sheet 1 are eroded processed ("trimmed"), with chamfers 11 and 12 arise.

In this case, the grinding wheel 6 is moved in the X direction along the edge 4 of the glass sheet 1 and rotated about its axis 7.

Further embodiments of grinding wheels 6 are shown in FIG. 6 (concavely curved contact surface 8 comprising an effective region),

FIG. 7 (trapezoidal effective area) and FIG. 8

(Cylindrical shell-shaped effective range) shown.

The grinding wheel 6 shown in FIG. 8 is used in particular for Rough the end face 5 of the glass pane 1 used, the edges are not broken, so no chamfers 11, 12th

arise.

To the entire edge 4 of a glass sheet 1, d. H. to edit all its edges 4, the grinding wheel 6 performs a

Relative movement around the glass pane 1 around.

For this purpose, either the grinding wheel 6 can be guided around the glass pane 1 or the glass pane 1 is guided along the entire edge 4 along the grinding wheel 6. Also contemplated is a combination of movements of the grinding wheel 6 and the glass sheet 1.

In the context of the invention is also considered, the

Editing the edges 4 of a glass sheet 1 not only with one, but with more than one, for example, two grinding wheels 6 perform. In the case of more than one grinding wheel 6, the processing of the edges 4 of a glass pane 1 can be carried out partly simultaneously, partly successively.

Equal chamfers 11, 12 at the edges of an edge 4 of a glass sheet 1 are readily achieved when the

End face 5 (more precisely, passing through the edges of the edge 4 (defined) level, because the end face 5 is not

is necessarily flat, but may also be curved or wavy) is a plane that is normal to the surfaces 2, 3 of the glass sheet 1 is aligned. In this case, the grinding wheel 6 is aligned symmetrically with respect to the median plane of the glass sheet 1 (plane lying midway between the surfaces 2, 3 of the glass sheet 1 and parallel thereto). This orientation of

Grinding wheel 6 to the glass pane 1 is shown in FIGS. 1, 6 and 7.

However, a symmetrical alignment with the center plane of the glass pane 1 results in the effective areas of the grinding tool only equal bevels 11 and 12, if the angle of the

End face 5 of the edge 4 at least to the surfaces 2, 3 of the glass pane 1 approximately normal, so a right angle is.

Glass panes 1 are made by dividing a larger glass sheet. The glass panels are after the.

Slit pattern and then broken along the scribe lines. This often results edges 4, the (flat or curved) faces 5 to the surfaces 2, 3 of the glass pane 1 are wrong. This is shown schematically in FIG. 15, for example.

The extent of the inclination of the end face 5 of the edge 4 of the glass pane 1 may vary over the length of the edge 4.

If a glass pane 1 is processed with an edge 4 according to FIG. 15, ie with a slanted end face 5 with a symmetrically oriented grinding wheel 6 (shown in solid lines in FIG. 16), chamfers 11, 12 with different sizes result.

According to the position of the grinding wheel 6 is adjusted relative to the glass sheet 1 from the symmetrical alignment by the offset V ₁₂ , so the grinding wheel 6 from her to

Glass pane 1 symmetrical orientation (central positioning) moves away, and takes the position indicated in Fig. 16 and 17 in dashed lines to the glass pane 1 a.

By changing the position of the grinding wheel 6 in the Z-direction (normal to the plane of the glass sheet 1 and parallel to the

The axis of rotation 7 of the grinding wheel 6) is achieved that about the same amount of glass is removed from both edges, so that approximately the same chamfers 11, 12 are formed.

In this case, the offset V ₁₂ of FIG. 16 and 17 by changing the position of the grinding wheel 6 and / or changing the position of the Glass pane 1 can be achieved in each case in the Z direction.

If after changing the position of the grinding wheel 6 from both edges of the edge 4 of the glass sheet 1 too large or too small chamfers 11, 12 are formed, the grinding wheel 6 can also be offset in the Y direction by moving away from the edge 4 or Edge 4 is adjusted (offset V ₂₃ in Fig. 17).

If, for example, the grinding wheel 6 removes a chamfer of the correct size in the position shown in FIG. 16 in solid lines on the left edge in FIG. 16, the displacement of the grinding wheel 6 would be offset by the offset V ₁₂ , that is to say in FIG. 16 position shown dashed, cause that at both edges too large chamfers 11, 12 would be formed. To take this into account, the grinding wheel 6 is through

Offset by the distance V ₂₃ from the dashed line in Fig. 17

shown position in the position shown in Fig. 17 shown in solid lines.

In Fig. 18, a glass sheet 1 and a grinding wheel 6 are shown in the position of Fig. 17 (solid lines). The points A and B correspond to the edges of the edges 4 of

Glass pane 1 before trimming. The connection of the points C and F corresponds to the chamfer 11 at one edge and the connection of the points E and G of the chamfer 12 at the other edge.

The amount of offset V ₁₂ (Figure 16) and offset V ₂₃ (Figure 17) can be calculated from the measured location of edges A and B at which chamfers are to be generated.

In the context of the invention is considered that during the movement of the grinding wheel 6 and / or the glass sheet 1 in the manufacture of chamfers 11, 12 of the offset V ₁₂ and / or V _{23 present at} the respective location of the attack of the grinding wheel 6 size of Angle of the face 5 is adjusted. In the invention, the position of the edges Ä, B at the edge 4 of a glass pane 1 is determined. On this basis, the position of the grinding wheel 6 is selected relative to the Glasscheibe.1. Thus, for example, a uniform trimming of the edges A, B of the edges 4 of a glass pane 1 in terms of constant dimensions of the chamfers 11, 12 can be achieved. In the case of continuous rejuvenation (adaptation) of the position of the grinding wheel 6 relative to the glass pane 1, taking into account the position of the edges A, B of the edges 4 of the glass pane 1, the desired size of the chamfers 11, 12 can also be achieved throughout.

In the context of the invention is also considered, the

Grinding wheel 6 to pivot about an axis extending in the X direction by an angle ψ to adjust the position of the grinding wheel 6, the position of the edges on the edge 4 of the glass sheet 1 to be processed. In this case, the plane of symmetry 13 between the

Angular regions 9 and 10 to the center plane of the glass pane 1 is tilted. The angle ψ can be set so that after the pivoting of the grinding wheel 6 by the angle ψ the plane of symmetry 13 between the active surfaces 9 and 10 of the

Grinding wheel 6 normal to the end face 5 (between the points A and B of Fig. 18) is aligned. The setting of the angle † is particularly advantageous when roughening the end face 5 of the edge 4 of a glass pane 1, as shown by way of example in FIG. 19.

For continuous adjustment of the offset V ₁₂ and V ₂₃ independent actuators (drives) may be provided.

The continuous adjustment of the offset V ₂₃ can also be carried out by a drive, which also executes the relative movement of grinding wheel 6 and glass pane 1.

The continuous adjustment of the offset V ₁₂ can also be performed by a drive, which serves to adjust the position of the grinding wheel 5 to the thickness of the glass sheet 1. For determining the position of the edges (symbolized by "A" and "B" in FIG. 18) of a rim 4 of a glass sheet 1, various methods can be adopted. For example, optical or image-recognition methods, in particular also mechanical scanning methods, are advantageous. By way of example, the edges A, B of an edge 4 of a glass pane 1 can be used by push-buttons sliding along the edges A, B, which are attached, for example, to pivoting arms or designed as springs. This is preferred in the context of the invention

mechanical scanning with the help of two leaf spring is particularly simple to implement.

Such a scanning device is shown partially and schematically in FIGS. 20, 21 and 22, FIGS. 20 and 22 being oblique views, and FIG. 21 being an end view of FIG

Scanning device show. In Fig. 20 is the tool

(Grinding wheel 6) for producing the chamfers 11,12 not

shown why in Fig. 20 and the chamfers 11,12 are not shown.

The position of the edges A, B of the edge 4 detecting buttons 20, 21 are in the illustrated embodiment leaf springs, the (resiliently) resiliently against the edges A, B of the edge 4 of the glass pane 1, whose position is to be determined, rest. The buttons 20, 21 are fixed at one end (in a holder, not shown), whereas they slide in the region of their free movable ends 22, 23 along the edges of the edge 4 of the glass sheet 1. The buttons 20, 21 are (see Fig. 21) aligned with each other so that they occupy the surfaces 2, 3 of the glass sheet 1, the angle and ß (see Fig. 21). These angles α and β are about 45 °. It means that the buttons 20, 21 to each other take an angle γ, which corresponds approximately to a right angle.

In FIGS. 20 and 21, the situation in the case of a glass pane 1, the end face 5 of which is to the plane of FIG Glass pane 1 is substantially perpendicular (right angle of the end face 5) and shown in dashed lines the situation in which the end face 5 to the plane of the

Glass pane 1 at a non-right angle, so obliquely, is set ("oblique face").

The buttons 20, 21 are located at the edges A and B, so that assuming that the position of the surfaces 2, 3 of the

Glass pane 1 corresponding levels constant and known, from the position of the buttons 20, 21 on the position of the edges A, B can be closed. The position of the buttons 20, 21 can be determined by means of displacement sensors 24, 25 (FIG. 21) which are attached to the holder of the buttons 20, 21. For the

Displacement sensors 24, 25 can find different measurement principles use, in particular, the measurement can be made contactless using an inductive sensor. The scanning can be done in both

Movement directions of the grinding wheel 6 take place, as symbolized by the arrow 26 in Fig. 20 and the arrow 27 in Fig. 22. As a rule, however, the grinding wheel 6 is located behind the machine, with reference to the direction of movement

Scanning device with the buttons 20, 21 (see Fig. 22).

For example, when the scanning device is moving in the direction of

Arrows 27 (Fig. 22) is used, the grinding wheel 6 on the side of the free (movable) ends 22, 23 of the buttons 20, 21 are arranged. In this case, the embodiment of the probe 20, 21 as leaf springs has the further advantage that they can be concavely curved and can form a channel, via the usual for grinding coolant over

Lines 30, 31 can be supplied. This is indicated schematically in FIG. 22.

The above-described determination of the position of the edges A, B by means of the buttons 20, 21 assumes that the position of the surfaces 2, 3 of the glass pane 1 is constant or known. If this is not the case, with the help of a further scanning the Position of the surfaces 2, 3 of the glass panes 1 in the vicinity of the edges A, B of the edge 4 to be processed are determined.

For example, the position of the surfaces 2, 3 of the glass sheet 1, as shown in Fig. 23, with the aid of two

Cam followers 32, 33 are determined. Instead of the scanning rollers 32, 33 and resilient buttons 20, 21, as shown in FIGS. 20 and 21 for scanning the edges A, B can be used.

In summary, an embodiment of the invention can be described as follows:

When producing chamfers 11, 12 at the edge 4 of a workpiece, such as a glass sheet 1, a grinding wheel 6 is used, which is moved along the edge 4 of the glass sheet 1. In this case, the edges A, B of the edge 4 of the glass pane 1 are machined away by the tool, which has effective areas 9, 10 on its peripheral surface, forming the chamfers 11, 12. If the flat, curved or wavy trained end face 5 of

Edge 4 of the glass sheet 1 is skewed to the center plane of the glass sheet 1, the tool is aligned along the edge 4 of the glass sheet 1 moves that in

Substantially equal chamfers 11, 12 are formed. The tool is for this purpose aligned so that the plane of symmetry 13 of the active regions 9, 10 of the tool is not in the center plane of the glass pane 1, that is from this distance and that the effective areas 9, 10 of the edges A, B of the edge 4 of the glass 1 have substantially equal distances.

Claims

Claims :

Device for processing flat workpieces (1), such as glass panes, with a tool, in particular a grinding wheel (6), which has effective areas (9, 10) and which is produced by machining edges (11, 12) when producing bevels (11, 12) , B) on edges (4) of the workpiece

(1) along the edge (4) of the workpiece (1) is movable, wherein the tool adjusting organs are assigned, with which the tool relative to the workpiece (1) transversely to the center plane of the workpiece (1) and in the direction of

Is adjustable center plane of the workpiece (i) to move the tool along the edge (4) of the workpiece (1) in a position in which the plane of symmetry (13) of the effective areas (9, 10) of the tool relative to one with the median plane of the workpiece (1) coinciding position is changed, such that the position of the effective areas (9, 10) of the tool relative to the edges (A, B) of the edge

(4) of the workpiece (1) is substantially identical, and wherein the tool associated with devices which the position of the edges (A, B) of the edge (4) of the workpiece

(1) capture, characterized in that the

Devices for detecting the position of the edges (A, B) are buttons (20, 21) which are located at the edges (A, B) of the edge

(4) of the workpiece (1) rest under elastic bias and that the buttons (20, 21) to the surfaces (2, 3) of the workpiece (1) are aligned at an angle of about 45 °.

Apparatus according to claim 1, characterized in that the buttons (20, 21) are channel-shaped and that the buttons (20, 21) lines (30, 31) are assigned for supplying cooling liquid.