EP2894014B1 - Blade, in particular oscillating blade, for use in a mechanical cutting method, for cutting sandwich boards - Google Patents

Description

The invention relates to a knife, in particular oscillating knife, for use in a particular oscillating cutting tool of a cutting machine according to the preamble of the independent claim 1.

Maschinueller Oszillierschneideverfahren and cutting machines with, for example, oscillating - that is driven - cutting tool and suitable for this oscillating, so that especially the cutting of a multi-wall composite panel - in particular sandwich panel - is provided, are known in the art.

In this context, a multi-wall composite panel is understood to be a sandwich panel, in particular of cardboard or cardboard material or plastic, which is constructed from at least one upper and one spaced apart lower comparatively strong, heavy-walled wall and has a comparatively light-weighted intermediate layer therebetween, in particular in the form of an intermediate wall five and 60 mm high intermediate structure, the example from thin-walled cardboard or cardboard material - such as honeycomb structure - or lightweight plastic - such as foam - exists.

For cutting such plates, it is known that the cutting machine and a correspondingly designed cutting tool for this purpose can provide a stroke stitching mode in which the plates can be cut or cut to size as desired. For example, in one such Hubstichmodus a knife inserted into a knife holder of the cutting tool by the cutting tool and the cutting machine in a stroke direction oscillating lowering and lifting substantially perpendicular to the composite sheet to be cut moves and guided in a feed direction along the composite plate. In particular, by way of example, the stroke stitch mode may include a stroke of between about 0.2 and about 12 millimeters, a stroke frequency of between about 50 and about 800 Hz (with a sinusoidal linear sweep), and a feed rate of between about 0.1 and about 4 meters per inch Second.

• Die Hauptschneidrichtung ist im Wesentlichen vertikal statt horizontal. Die horizontalen Schneidkräfte sind verringert.

The oscillating cutting offers - for example, the drawing cutting, which is carried out using a non-self-powered cutting tool with inserted pulling knife - for example, the following advantages:

• The main cutting direction is essentially vertical rather than horizontal. The horizontal cutting forces are reduced.

As known to those skilled in the oscillating processing is particularly suitable for cutting thick and tough materials. The oscillating movement of the knife reduces the pushing force in the direction of travel (also called the feed direction).

• Für grosse Radien, Geraden und grosse Teile empfiehlt es sich tendenziell eher abgeflachte Messer zu verwenden.

However, the feed rate must be adapted to the knife geometry and the oscillation frequency of the tool used. The choice of the right oscillating blade mainly depends on the machining contour:

• For large radii, straight lines and large parts, it is recommended to use rather flattened knives.

The field of application for pointed knives is aimed in particular at the machining of fine radii and small parts. The feed rate should generally be reduced compared to the use of flat knives in order to achieve a sufficient cutting result.

• Hohe Bearbeitungsgeschwindigkeit
• Grosse Radien, Geraden bzw. grosse Teile

Comparatively flat blades (see Figures 2e-2h ) are in particular for:

• High processing speed
• Large radii, straight lines or large parts

• Geringe Bearbeitungsgeschwindigkeit
• Feine Radien bzw. kleine Teile

Comparatively sharp knives (see FIGS. 1 . 2a-2d ) are in particular for:

• Low processing speed
• Fine radii or small parts

A disadvantage in the use of relatively flat blades - ie those knives, which are intended for the field of application with high processing speeds and large radii, straight lines or large parts - has been found that - depending on the angle of the cutting edge (ie "Steile" of The cutting edge) either the cutting angle suboptimal (because too steep) must be selected or - with flat cutting profile - when cutting moldings from thick composite panels (such as sandwich panels with at least two strong walls and intermediate structure), which in total then eg 10, 16 or 20 mm thick, each unwanted overcuts in the material are required, which complicates, among other things, the calculation of the cutting paths.

It is therefore an object to provide an improved knife for use in a cutting tool of a cutting machine, which is intended and intended for cutting composite panels such as sandwich panels, in particular wherein the knife is intended for high processing speeds and large radii, straight lines or large parts.

In particular, the abovementioned disadvantages of the flat oscillating blades hitherto used for this special field of use are intended to be reduced or eliminated. In particular, a better goal conflict solution is to be provided between a steep course of the cutting edge with then suboptimal cutting angle (for little overcut) and flat (less steeply inclined with respect to the feed direction) course of the cutting edge with optimized cutting angle (but with considerable unwanted overcut).

These objects are achieved by the realization of the characterizing features of the independent claims. Features which further develop the invention in an alternative or advantageous manner can be found in the dependent claims.

The subject invention relates to a cutting machine blade for use in a cutting tool of a cutting machine, designed and precisely provided for cutting a multi-wall composite panel - in particular sandwich panel - of cardboard or cardboard material or plastic, the at least one upper and a lower spaced respectively comparatively strong sheared wall and an intervening comparatively light interlayer, in particular in the form of a structure of between five and 60 millimeters high of material with cavities, in particular designed as a repeating cell pattern structure or foam.

The cutting machine knife is intended for use in an automatic cutting mode in which the cutting machine knife is guided by the cutting machine in a feed direction along the composite board. In particular, the cutting blade is designed as a flat knife and provided for use in a cutting mode in which at relatively high speeds (feed speeds) large radii or straight lines or large parts are cut from composite panels.

The cutting machine blade has a holding section for use of the cutting machine blade in a knife holder of the cutting tool and a blade with cutting edge.

• eine erste relativ zur Vorschubrichtung schräg verlaufende Zone der Schneide zum Schneiden der unteren Wand vorgesehen ist,
• eine zweite relativ zur Vorschubrichtung schräg verlaufende Zone der Schneide zum Schneiden der oberen Wand vorgesehen ist, wobei jeweilige Profile der Schneide im Bereich der ersten und zweiten Zone mit der Vorschubrichtung jeweils einen ersten Winkel von zwischen etwa 30° und etwa 70° einschliessen, und dass
• eine Zwischenzone der Schneide zwischen der ersten und der zweiten Zone vorhanden ist mit einem Profil, das einen zweiten Winkel mit der Vorschubrichtung einschliesst, welcher grösser ist als der erste Winkel, insbesondere grösser ist als 90°.

According to the invention, the blade is now divided or the geometry of the cutting edge chosen such that

• a first zone of the cutting edge inclined relative to the feed direction is provided for cutting the lower wall,
• a second inclined relative to the feed direction zone of the cutting edge for cutting the upper wall is provided, wherein respective profiles of the cutting edge in the region of the first and second zone with the feed direction each include a first angle of between about 30 ° and about 70 °, and
• an intermediate zone of the cutting edge between the first and the second zone is present with a profile which encloses a second angle with the feed direction, which is greater than the first angle, in particular greater than 90 °.

This can now be achieved according to the invention that when cutting moldings from relevant composite panels (such as sandwich panels with at least two strong walls and intermediate structure, which may be, for example, a total of 10, 16 or 20 mm thick, for example), respectively unwanted overcuts in the material reduced or even can be completely avoided, what among other things also significantly simplify the calculation of the cutting paths. By means of the invention, the upper and lower walls of the composite panel can now be cut in the feed direction with essentially the same cutting advance, without the upper panel always being significantly further cut at identical times than the lower one (or the section in the lower wall) Section in the upper wall in each case significantly nachhängt).

The cutting edge in the region of the intermediate zone may advantageously in particular in such a way - relative to the feed direction - extends obliquely behind, that the curves of the cutting edge within the first and the second zone - respectively orthogonally projected on the feed direction - overlap at least partially, in particular substantially completely overlap, in particular so that the progressions of the cutting edge within the first and second zones are substantially offset in parallel only in the direction orthogonal to the feed direction.

The first zone of the cutting edge in the context of this invention is formed by that portion of the cutting edge, which is intended and made just to cut in a defined and then for this knife exactly intended cutting mode, the bottom wall of the composite plate. The second zone of the cutting edge in the context of this invention is formed by that portion of the cutting edge, which is intended and made just to cut in a defined and then for this knife exactly intended cutting mode, the upper wall of the composite plate.

Among the abovementioned angles and also mentioned below, which form the respective profiles of the cutting edge in the respective zones with the feed direction, angles are to be understood that form a respective main course direction of the respective profiles in the respective zones with the feed direction (respectively smaller of the two angles formed between the vectors, considered when the respective vector suspension points of the two vectors are superposed). If a profile in a zone does not run straight, then a main profile of the profile is to be considered or a direction in which the profile in the corresponding zone extends substantially in the middle (thereby away from the blade tip corner in the direction of the knife neck). The course direction of a profile within a respective zone is therefore considered to be in the same direction as the cutting edge extends away from its origin in the blade tip (ie away from the blade tip in the direction of the blade neck or holding region of the blade which the blade point corner (bottom point) is not on the The back of the blade is located and between the blade tip and blade back a "reverting" tip section is formed - possibly also away from the blade tip corner in the direction of the back]).

As a result of the resetting of the second zone of the knife according to the invention, the intermediate region is now aligned suboptimally with respect to its cutting angle to the intermediate structure of the composite panel, which is likewise to be cut through. However, this drawback (compromise disadvantage) overall does not significantly affect the cutting result, since the intermediate structure consists of precisely cut material (in particular with cavities) and thus can be cut sufficiently well even with a suboptimal cutting angle.

The invention may in particular be an oscillating blade for use in an oscillating cutting tool. The Oszilliermesser should then be designed so that it is specially designed and predestined for use in a defined Hubstichmodus in which the knife - in addition to the guide along the feed direction - by the cutting tool in a stroke direction oscillating up and down substantially perpendicular to cutting composite plate is moved. The stroke movement itself can be carried out in particular linearly sinusoidal, so that combined from the two movements results in a sinusoidal curve as a combined path of movement. Alternatively, however, there is also a hoist motion with uniform motion for sinking and also uniform motion for hoisting (so that in combination with the feed, a sawtooth-like curve results as a path).

In particular, the stroke stitch mode for which the knife is made may have a stroke of between about 0.2 and about 12 millimeters, a stroke frequency of between about 50 and about 800 Hz, and a feed rate of between about 0.1 and about 4 meters per inch Second.

• einen Hub von zwischen etwa einem und etwa fünf Millimeter, insbesondere zwischen etwa zwei und etwa drei Millimeter, im Speziellen etwa 2,5 Millimeter,
• eine Hubfrequenz von zwischen etwa 100 und etwa 500 Hz, insbesondere zwischen etwa 200 und etwa 300 Hz, im Speziellen etwa 250 Hz, sowie
• eine Schneidegeschwindigkeit in Vorschubrichtung von zwischen etwa 0,5 und etwa 2 Metern pro Sekunde, insbesondere zwischen etwa 0,75 und etwa 1,5 Metern pro Sekunde, im Speziellen etwa einen Meter pro Sekunde.

In more specific embodiments, the lift stitch mode for which the knife is made may include

• a stroke of between about one and about five millimeters, in particular between about two and about three millimeters, in particular about 2.5 millimeters,
• a stroke frequency of between about 100 and about 500 Hz, in particular between about 200 and about 300 Hz, in particular about 250 Hz, as well as
• a cutting speed in the feed direction of between about 0.5 and about 2 meters per second, in particular between about 0.75 and about 1.5 meters per second, in particular about one meter per second.

As already mentioned above, the oscillating cutting offers, for example, the advantage of cutting, which is carried out using a non-self-driven cutting tool with inserted pulling knife - for example, the advantages that the main cutting direction is substantially vertical instead of horizontal and thus the horizontal cutting forces are reduced (so that Technique is typically used for composite panels with comparatively thick, firm upper and lower walls).

However, it is also quite possible to realize a draw knife provided for composite panels according to the invention with an intermediate zone which recycles the second zone of the cutting edge.

Furthermore, a knife which is specially designed and provided for cutting a multi-sandwich plate can also be designed such that the teaching of the invention has a plurality of wall cutting zones and a respective plurality of "receding" intermediate zones such that one adjoins an intermediate zone upwards Wall cutting zone (in comparison to downwardly adjoining wall cutting zone) by the course of the cutting edge within the intermediate zone to the rear (viewed in the feed direction) is added, in the sense of the teaching of the invention described above.

Furthermore, the invention also relates to a cutting machine with cutting tool having a knife holder, in which a cutting machine blade according to the invention - as described above - is used. The cutting machine thereby provides a cutting mode in which the cutting machine blade is guided by the cutting machine in a feed direction along the composite plate. In the cutting mode, the cutting machine with the cutting machine blade used is then precisely designed and provided for cutting a multi-wall composite panel - in particular sandwich panel - of cardboard or cardboard material or plastic, which has at least one upper and a lower spaced comparatively strong heavy wall and at least one between them lying comparatively light interlayer, especially in the form of one between five and 60 millimeter high structure of material with cavities, specifically designed as a repeating cell pattern structure or foam.

Furthermore, the invention relates to the use of the cutting machine blade according to the invention - as described above - used in a cutting machine with cutting tool and also a method for cutting composite panels of the aforementioned type using a cutting machine with cutting tool and inserted therein cutting machine blade (as described above).

Fig. 1-2

Ausführungsformen von Oszilliermessern entsprechend dem Stand der Technik;

Fig. 3a

ein Oszilliermesser entsprechend einer ersten erfindungsgemässen Ausführungsform beim oszillierenden Schneiden einer Verbundplatte;

Fig. 3b

das Oszilliermesser entsprechend der ersten Ausführungsform mit Indizierung der funktionalen Aufteilung des Messers;

Fig. 4a-g

verschiede Ansichten des Oszilliermessers entsprechend der ersten Ausführungsform zur Veranschaulichung diverser spezieller Merkmale;

Fig. 5

das Oszilliermesser entsprechend der ersten Ausführungsform beim oszillierenden Schneiden einer Verbundplatte mit Indizierung des Bewegungspfades in einem speziellen Hubstichmodus;

Fig. 6a-c

verschiede Ansichten eins Oszilliermessers entsprechend einer zweiten erfindungsgemässen Ausführungsform;

Fig. 7a-c

verschiede Ansichten eins Oszilliermessers entsprechend einer dritten erfindungsgemässen Ausführungsform;

Fig. 8a-c

Grobskizzen von Oszilliermessern entsprechend einer vierten, fünften und sechsten erfindungsgemässen Ausführungsform.

The device according to the invention and the method according to the invention are described in more detail below purely by way of example with reference to concrete exemplary embodiments shown schematically in the drawings, with further advantages of the invention also being discussed. In detail show:

Fig. 1-2

Embodiments of oscillating blades according to the prior art;

Fig. 3a

an oscillating blade according to a first embodiment of the invention in oscillating cutting a composite plate;

Fig. 3b

the Oszilliermesser according to the first embodiment with indexing of the functional distribution of the knife;

Fig. 4a-g

various views of the oscillating blade according to the first embodiment for illustrating various specific features;

Fig. 5

the oscillating blade according to the first embodiment in the oscillating cutting of a composite plate with indexing of the movement path in a special Hubstichmodus;

Fig. 6a-c

various views of a oscillating blade according to a second embodiment of the invention;

Fig. 7a-c

various views of a oscillating blade according to a third embodiment of the invention;

Fig. 8a-c

Large-scale sketches of Oszilliermessern according to a fourth, fifth and sixth inventive embodiment.

FIG. 1 shows an embodiment of a sharp oscillating knife according to the prior art in oscillating cutting a composite plate 20. The blade 10 in this case has a cutting edge 16 extending over its entire extent straight (obliquely upward in the drawing) and thus over the entire edge profile a single common angle with the feed direction 52 includes, in which the knife is guided in the context of a Hubstichmodus along the composite plate.

In this case, the composite panel 20 has an upper and a lower, respectively comparatively strong, heavy-walled wall 21, 22 and a comparatively light-weight intermediate layer 23 located therebetween Composite panel during the cutting process with its bottom wall 22 typically on a cutting pad 30 on.

In this case, the cutting edge 16 forms zones within which, in the context of the stroke stitching mode, in particular only the bottom wall 22, especially essentially only the top wall 21 and especially essentially only the intermediate structure 23, are cut. However, the zones are identical in their course and the angles of intersection of the profiles within the zones are each optimized for cutting the material in the corresponding stroke stitching mode and in the corresponding field of application (as regards the operating speeds and sectional shapes of the parts).

As part of a Hubstichmodus while the knife - in addition to the movement in the feed direction 52 causes by the cutting machine - by the oscillating cutting tool, in which the knife is inserted, in the stroke direction 51 lowering and lifting linear down and up moves, for example, with sinusoidal Hubfortbewegung in terms of the velocity course in the stroke direction.

As already mentioned in the introduction, when using knives from the prior art with consistently straight oblique course of the blade has the disadvantage that when cutting molded parts of thick composite panels (such as sandwich panels with at least two strong walls and intermediate structure), which in total Then, for example, 10, 16 or 20 mm thick, each unwanted overcuts in the material (ie, the upper wall is cut further than the lower) are required, which complicates, among other things, the calculation of the cutting paths.

Figures 2a-2h show four further embodiments of oscillating blades according to the prior art, each shown in two different views.

• hohe Bearbeitungsgeschwindigkeit und
• grosse Radien, Geraden bzw. grosse Teile. Vergleichsweise spitze Messer (siehe Figuren 1, 2a-2d) sind dabei insbesondere für:
• geringe Bearbeitungsgeschwindigkeit und
• feine Radien bzw. kleine Teile.

As already mentioned in the introduction comparatively flat blades (see Figures 2e-2h , with strongly blunted knife tip area) in particular for:

• high processing speed and
• large radii, straights or large parts. Comparatively sharp knives (see FIGS. 1 . 2a-2d ) are in particular for:
• low processing speed and
• fine radii or small parts.

FIG. 3a shows an oscillating according to a first inventive embodiment in oscillating cutting a composite plate of the aforementioned type with upper comparatively heavy-wall 21, lower comparatively heavy-wall 22 and comparatively leichtschnittiger intermediate structure 23. The composite plate is - as is known in the art and probably also typical in this application - on a cutting pad 30 on. The knife 1 according to the first exemplary embodiment is, for example, for composite panels of medium thickness (eg, having a thickness of about 16 mm in total) tuned.

As part of a Hubstichmodus while the knife - in addition to the movement in the feed direction 52 caused by the cutting machine - by the oscillating Cutting tool, in which the knife is inserted, in the stroke direction 51 lowering and lifting linearly up and down moves.

• eine erste relativ zur Vorschubrichtung 52 schräg verlaufende Zone 12 der Schneide 16 zum oszillierenden Schneiden der unteren Wand 22 vorgesehen ist und
• eine zweite relativ zur Vorschubrichtung schräg verlaufende Zone 11 der Schneide 16 zum oszillierenden Schneiden der oberen Wand 21 vorgesehen ist.

According to the invention, the blade is now so divided or the geometry of the cutting edge 16 in its course selected such that

• a first inclined zone 12 of the cutting edge 16 is provided for oscillating cutting of the lower wall 22 relative to the feed direction 52 and
• a second zone 11, which is inclined relative to the feed direction, of the cutting edge 16 is provided for the oscillating cutting of the upper wall 21.

In this case, the respective profiles of the cutting edge 16 in the region of the first and second zones 12, 11 with the feed direction 52 each include a first angle of between approximately 30 ° and approximately 70 ° (in this case approximately 52 °).

Furthermore, an intermediate zone 13 of the cutting edge 16 between the first and the second zone 12, 11 is present with a profile that includes a second angle with the feed direction 52, which is greater than the first angle, in particular greater than 90 °. In the example shown (see also FIG. 4d ), this second angle 50 is approximately in the range between 100 ° and 120 °.

The cutting edge 16 thus runs in the region of the intermediate zone 13 in such a manner - relative to the feed direction - obliquely behind, that overlap the progressions of the cutting edge within the first and the second zone 12, 11 - respectively orthogonally projected on the feed direction 52 - at least partially. In the example shown, they overlap This is essentially complete, so that the courses of the cutting edge within the first and second zones 12, 11 are substantially offset in parallel only in the direction orthogonal to the feed direction 52.

As can also be seen, the cutting edge within the first and the second zone 12, 11 can run in an essentially straight manner by way of example in each case.

The cutting edge, viewed in the course of the blade tip in the direction of the holding section, thus forms the first zone 12 in front of the intermediate zone 13 and the intermediate zone 13 in front of the second zone 11.

FIG. 3b illustrates again exemplified the functional areas of the embodiment FIG. 3a trained knife.

At least area 19 dives completely into the cutting base at the lowest stroke point. Depending on the configuration, a part of area 12 can also dip into the cutting surface. The dot-dash line represents the surface of the cutting pad, just as the knife may be in the lowest stroke point configuration in a possible stroke stitch mode configuration. The length of the thick line determines with the stroke frequency the maximum feed rate, so that the material to be cut (ie the bottom wall of the composite panel) can still be completely cut. Areas 12 and 11 mainly intersect the hard layers (ie, upper wall) of the composite panel. Area 13 cuts the soft core. Area 15 (the holding section of the knife) is for attaching the knife in the cutting tool.

FIGS. 4a to 4g show various views of the oscillating blade according to the first embodiment for illustrating various specific features.

The knife 1 has a holding portion 15 for use desselbigen in a knife holder of a cutting tool and a blade 10 (wherein between holding portion 15 and blade 10 here is a little pronounced knife neck results).

The blade has blade blade 17, blade 16 (the blade blade converges in a wedge-like manner at certain points in the direction of the blade) and a blade spine 18.

Also in these in FIGS. 4a-c shown views of the first inventive embodiment of an oscillating blade 1, in turn, the first zone 12, the intermediate zone 13 and the second zone 11 of the cutting edge 16 are indicated.

The knife is designed with a flat blade tip. The blade extends over the entire blade tip and thus the blade tip has a flatter profile relative to the feed direction (i.e., less inclined to the direction of advance) as compared to the profile within the first zone.

In the region of the blade tip, the cutting edge has a geometry which is axisymmetric in the lifting direction and has two blade tip zones which form a flat corner lying on the symmetry axis and respectively have profiles running less obliquely with respect to the feed direction than the profile within the first zone 12 the profiles of the two Blade tip zones with the feed direction include angles of between about 2 ° and about 30 ° or of between about 150 ° and 178 °, in particular between about 10 ° and about 20 ° or between about 160 ° and 170 °, in particular as concrete in the example shown here - from about 15 ° or from about 165 °.

Such a profile of the cutting edge in the region of the blade tip can be advantageous when the knife is immersed in the cutting support, since the knuckle or the symmetry in the blade tip ensures, on the one hand, a slightly oblique cutting edge progression over the entire blade tip area for the immersion and, on the other hand Nevertheless, the immersion depth in the pad - can be kept low (namely, can be halved) compared to an ungeknick slightly oblique tip.

As already related to FIG. 3b mentioned determines the width 44 (see FIG. 4d ) of the blade tip area together with the stroke frequency, the maximum feed rate, so that the material to be cut (ie the bottom wall of the composite panel) can still be completely cut. Depending on the lifting mode in which work is to be done, so the knife or its geometry is specially adapted to the traversed feed rate and the stroke frequency, especially what the first angle 41, 42 (ie angle by the respective profiles within the first and second zone of the cutting edge with the feed direction), but also what the width 44 of the flat blade tip (ie extension of the tip in the feed direction) as well as the flatness 43 of the tip (ie extension of the tip in the stroke direction) concerns. These blade geometry parameters for the knife are in FIG. 4d specially marked.

In concrete terms, for example, a stroke stitching mode which has a stroke of between about 0.2 and about 12 millimeters, a stroke frequency of between about 50 and about 800 Hz and a cutting speed in the feed direction of between about 0.1 and about 4 may be used for the cutting of corresponding sandwich panels Meters per second. Specifically, the lift stitch mode may have a stroke of between about one and about five millimeters, more preferably between about two and about three millimeters, a stroke frequency of between about 100 and about 500 Hz, more preferably between about 200 and about 300 Hz, and a cutting speed in the feed direction of between about 0.5 and about 2 meters per second, in particular between about 0.75 and about 1.5 meters per second. The geometry of the knife according to the invention can thus advantageously be optimized especially for such a stroke stitch mode.

The blade with the cutting edge can thus be advantageously designed - for example optimized for a lifting mode with a stroke of, for example, about 2.5 mm, a stroke frequency of, for example, about 250 Hz and a feed rate of, for example, about 1 m / s. the first angles 41, 42 enclosed by the respective profiles of the cutting edge in the region of the first and second zones are in each case between approximately 30 ° and approximately 70 °, in particular between approximately 45 ° and approximately 60 °, in particular approximately 52 ° ° is. Furthermore, the blade tip can be designed such that it has an extent or extension (ie width 44) in the feed direction of about 0.5-10 millimeters, in particular of between approximately 3 and about 6 millimeters, in particular of about 4.5 millimeters.

In Figure 4e Here is a sectional view AA of the blade of the knife shown, with the corresponding section AA in FIG. 4d is indexed. It is evident in this cross-sectional view AA - but in particular in the section Z pointing enlarged Figure 4g - The optional two-stage wedge-like course of the blade from the blade to blade 16 out. The first surfaces 48 of the cutting wedge directly forming the cutting edge 16 converge less sharply than converging second surfaces 49 of the wedge extending between the first surfaces 48 and the blade blade, particularly where the first surfaces 48 have a cutting angle 47 of between about 15 ° and 50 ° and the second surfaces 49 converge at an angle 46 that is less than the cutting angle 47 between about 3 ° and 20 °. More specifically, the cutting angle 47 may advantageously be selected to be between about 25 ° and about 35 ° , in particular approximately at 30 °, and the angle 46 so that it is between about 5 and 12.5 ° smaller than the cutting angle 47, in particular at about 20 °.

The thickness of the blade blade, with the two blade blade surfaces (i.e., front and back surfaces of the blade blade) advantageously aligned parallel to each other, may be, for example, between about 0.4 and about 3 millimeters.

In FIG. 4f is a sectional view BB - where the section BB in FIG. 4d is indicated - the blade of the knife shown. In this case, in particular, the optional one is apparent in this cross-sectional representation BB Characteristic that the two edges, which form the two blade surfaces with the back of the blade, can be chamfered.

In particular, bevels (e.g., at an angle of about 45 ° to the spine or blade surfaces) may be realized with an extension 45 in the feed direction of between about 0.05 and 2 mm (depending on the thickness of the blade blade).

Such a chamfered blade back can bring advantages in particular when cutting radii (-> less friction, scratching and / or tilting with the material to be cut on the back of the blade) as well as the first vertical insertion of the blade into the material and pulling the blade at the end of a cutting.

FIG. 5 shows the oscillating blade according to the first embodiment in the oscillating cutting of a composite plate, wherein the traversed in a special stroke stitching mode with strokes with sinusoidal velocity curve trajectory of the lower end of the first zone of the cutting edge is indicated (see thick sinusoidal line). With a thin sinusoidal line, the traversed travel path 55 of the lower end of the second zone of the cutting edge which intersects the top wall of the composite panel is indicated.

The lifting movement itself is therefore designed to be linearly sinusoidal, so that combined from the two movements a sinusoidal curve results as a combined movement path 55. Alternatively, however, it is also possible to use a lifting movement with uniform movement for lowering and also a uniform movement for lifting (so that in Combination with the feed gives a sawtooth curve as the path).

As can be seen from the indexed movement path 55 (as well as already in connection with FIG. 3b Thus, the cutting machine knife can be precisely provided for cutting the composite plate lying directly on a cutting surface, with the bottom wall, for which the blade with its blade tip - so matched to the composite panel to be cut and the Hubstichmodus provided for application - is designed that In the case of an oscillating cutting, the blade tip - when the cutting machine blade is lowered in stroke embossing mode - is inserted into the cutting surface in a cutting manner.

Furthermore, as in FIG. 5 also seen from the course of the movement path 55 in conjunction with the illustrated first and second zones of the cutting edge and the lower and upper wall of the composite material - the blade with its blade tip so accurately matched to the composite panel to be cut and the intended application Hubstichmodus that - with each lowering the Schneidemaschinenmessers in Hubstickmodus - the lower wall is cut substantially exclusively with the first zone of the cutting edge and the blade tip and the upper wall substantially exclusively with the second zone of the cutting edge.

Figures 6a-c show various views of an oscillating blade 1 according to a second embodiment of the invention. The second embodiment is with respect to almost all features identical to the first embodiment, except for the aspect that the knife according to the second embodiment is optimized and specially adapted for cutting relatively less thick composite panels (ie plates with less thick intermediate layer), ie composite panels of overall smaller thickness (eg, a thickness of about 10 mm in total).

The intermediate zone 13 is - correspondingly shorter - compared to the knife according to the first embodiment. Furthermore, the first zone 12 - compared to the knife according to the first embodiment - be designed slightly shorter.

FIGS. 7a-c show various views of an oscillating blade according to a third embodiment of the invention. The third embodiment is identical in almost all features with the first and second embodiments, except for the aspect that the knife according to the third embodiment is optimized and specially adapted for cutting comparatively thick composite panels (ie plates with thick intermediate layer), ie Composite panels of high overall thickness (eg having a total thickness of about 20 mm or more).

The intermediate zone 13 is formed correspondingly longer in comparison to the knife according to the first embodiment and also has an additional section within this intermediate zone within which the cutting edge first extends at an angle of eg 90 ° relative to the feed direction, before then a section inside the intermediate zone follows with an angle of the local Cutting edge of eg between 105 ° and 120 ° relative to the feed direction.

Figures 8a-c 8 show coarse sketches of oscillating knives according to a fourth, fifth and sixth embodiment according to the invention, which possible variations of the cutting geometry or the cutting profile, in particular in regions of the cutting edge within the intermediate zone 13 and the blade tip 19, can be taken from the principle.

It is understood that these illustrated figures represent only possible embodiments schematically. The various approaches may also be combined with each other as well as with prior art devices or methods.

Claims (15)

1. Cutting machine blade (1) to be fitted into a cutting tool of a cutting machine, formed and accurately provided in order to cut a multiwalled composite plate (20) - particularly a sandwich plate - made of cardboard or paperboard material or plastic, which has at least an upper wall and separated therefrom a lower wall (21, 22), which are respectively relatively thick and difficult to cut, and an intermediate layer (23) lying between them, which is relatively easy to cut, particularly in the form of a structure between five and 60 millimeters high made of material with cavities, in particular formed as a repeating cell pattern structure or from foam,

   • wherein the cutting machine blade (1) is intended for use in the scope of an automatic cutting mode, in which the cutting machine blade (1) is guided by the cutting machine in a forward direction (52) along the composite plate (20),
   having

   • a holding section (15) for fitting the cutting machine blade (1) into a blade holder of the cutting tool, and

   • a cutter (10) with an edge, a first zone (12) of the edge (16) extending obliquely relative to the forward direction (52) being provided for cutting the lower wall (22), and a second zone (11) of the edge (16) extending obliquely relative to the forward direction (52) being provided for cutting the upper wall (21), respective profiles of the edge (16) in the region of the first and second zones (12, 11) respectively making a first angle (41, 42) of between about 30° and about 70° with the forward direction (52),

   characterized in that
   there is an intermediate zone (13) of the edge (16) between the first and second zones (12, 11), with a profile that makes a second angle (50) with the forward direction (52) which is greater than the first angle (41, 42), in particular greater than 90°.
2. Cutting machine blade (1) according to Claim 1,
   characterized in that
   the edge (16) extends obliquely backward - relative to the forward direction (52) - in the region of the intermediate zone (13), in such a way that the shapes of the edge (16) within the first and second zones (12, 11) - respectively projected orthogonally on to the forward direction (52) - at least partially overlap, and in particular overlap essentially fully, in particular so that the shapes of the edge (16) within the first and second zones (12, 11) are essentially parallel, and are only offset in a direction orthogonal to the forward direction (52).
3. Cutting machine blade (1) according to Claim 1 or 2,
   characterized in that
   the edge (16) respectively extends essentially straight within the first and second zones (12, 11).
4. Cutting machine blade (1) according to one of the preceding claims,
   characterized in that
   lips formed by the cutter back (18) and respective front and rear surfaces of the cutter leaf (17) are chamfered.
5. Cutting machine blade (1) according to one of the preceding claims,
   characterized in that
   the edge (16) - as seen in the extent from the cutter tip (19) in the direction of the holding section (15) - forms the first zone (12) before the intermediate zone (13) and the intermediate zone (13) before the second zone (11).
6. Cutting machine blade (1) according to one of the preceding claims,
   characterized in that
   the cutter (10) tapers in two stages in the shape of a wedge from the cutter leaf (17) to the edge (16), first surfaces (48) of the wedge, directly forming the edge (16) tapering less acutely than convergent second surfaces (49) of the wedge, extending between the first surfaces (48) and the cutter leaf (17), in particular with the first surfaces (48) forming an edge angle of between about 15° and 50°, and the second surfaces (49) converging with an angle which is between about 3° and 20° less than the edge angle.
7. Cutting machine blade (1) according to one of the preceding claims,
   characterized in that
   the cutting machine blade (1) is formed as an oscillating blade to be fitted in an oscillating cutting tool, and is intended for use in the scope of a defined stroke cutting mode, in which the cutting machine blade (1) - in addition to the guiding along the forward direction (52) - is moved by the cutting tool oscillating up and down in a stroke direction (51) essentially perpendicularly to the composite plate (20) to be cut, in particular with the stroke cutting mode having a stroke of between about 0.2 and about 12 millimeters, a stroke frequency of between about 50 and about 800 Hz, and a cutting speed in the forward direction (52) of between about 0.1 and about 4 meters per second,
   in particular with the stroke cutting mode having a stroke of between about one and about five millimeters, particularly between about two and about three mm, in particular about 2.5 millimeters, a stroke frequency of between about 100 and about 500 Hz, particularly between about 200 and about 300 Hz, in particular about 250 Hz, and a cutting speed in the forward direction (52) of between about 0.5 and about 2 meters per second, particularly between about 0.75 and about 1.5 meters per second, in particular about one meter per second.
8. Cutting machine blade (1) according to Claim 7,
   characterized in that
   the edge (16) extends over the cutter tip (19), and the cutter tip (19) has - in comparison with the profile within the first zone (12) - a flatter profile relative to the forward direction (52).
9. Cutting machine blade (1) according to Claim 7 or 8,
   characterized in that
   the edge (16) has a geometry in the region of the cutter tip (19) which is axisymmetric in the stroke direction (51) with two cutter tip zones, which form a flat vertex lying on the symmetry axis and respectively have - in comparison with the profile within the first zone (12) - profiles extending less obliquely relative to the forward direction (52), in particular with the profiles of the two cutter tip zones making angles with the forward direction (52) of between about 2° and about 30° and respectively between about 150° and 178°, in particular between about 10° and about 20° and respectively between about 160° and 170°, in particular about 15° and respectively about 165°.
10. Cutting machine blade (1) according to one of Claims 7 to 9,
    characterized in that
    the cutter tip (19) has an extent (44) in the forward direction (52) of about 0.5-10 millimeters, particularly between about 3 and about 6 millimeters, in particular about 4.5 millimeters.
11. Cutting machine blade (1) according to one of Claims 7 to 10,
    characterized in that
    the cutting machine blade (1) is accurately provided in order to cut the composite plate (20) lying with the lower wall (22) flat and directly on a cutting base (30),
    to which end the cutter (10) with its cutter tip (19) is formed in such a way that - while being adapted to the composite plate (20) to be cut and the stroke cutting mode intended for use - during the oscillating cutting the cutter tip (19) cuts - each time the cutting machine blade (1) is lowered in the stroke cutting mode - into the cutting base (30),
    in particular with - for the case in which the edge (16) has a geometry in the region of the cutter tip (19) which is axisymmetric in the stroke direction (51) according to the feature of Claim 9 - a penetration depth of the blade at the lowest point of the oscillating movement which is less - in particular half as deep - as in the case of a corresponding imaginary blade with an edge (16) which is not bent but that extends similarly obliquely in the region of the cutter tip (19).
12. Cutting machine blade (1) according to one of Claims 7 to 11,
    characterized in that
    the cutter (10) is adapted accurately to the composite plate (20) to be cut and to the stroke cutting mode intended to be used in such a way that - each time the cutting machine blade (1) is lowered in the stroke cutting mode - the lower wall (22) is cut essentially only with the first zone (12) of the edge (16) and the cutter tip (19), and the upper wall (21) is cut essentially only with the second zone (11) of the edge (16).
13. Cutting machine blade (1) according to one of the preceding claims,
    characterized in that
    the cutter (10) with the edge (16) is formed in such a way that the first angle (41, 42) made with the forward direction (52) by the respective profiles of the edge (16) in the region of the first and second zones (12, 11) is between about 40° and about 65°, particularly between about 45° and about 60°, in particular about 52°.
14. Cutting machine having a cutting tool, which has a blade holder in which a cutting machine blade (1) according to one of Claims 1 to 13 is fitted, wherein the cutting machine provides a cutting mode in which the cutting machine blade (1) is guided by the cutting machine in a forward direction (52) along the composite plate (20), in which the cutting machine with the fitted cutting machine blade (1) is accurately formed and provided in order to cut a multiwalled composite plate (20) - particularly a sandwich plate - made of cardboard or paperboard material or plastic, which has at least an upper wall and separated therefrom a lower wall (21, 22), which are respectively relatively thick and difficult to cut, and an intermediate layer (23) lying between them, which is relatively easy to cut, particularly in the form of a structure between five and 60 millimeters high made of material with cavities, in particular formed as a repeating cell pattern structure or from foam,
    particularly with the cutting machine blade (1) being formed as an oscillating blade and the cutting tool being formed as an oscillating cutting tool, and the cutting machine and the cutting tool providing a stroke cutting mode, in which the cutting machine blade (1) - in addition to the guiding along the forward direction (52) - is moved by the cutting tool oscillating up and down in a stroke direction (51) essentially perpendicularly to the composite plate (20) to be cut, in particular with the stroke cutting mode having a stroke of between about 0.2 and about 12 millimeters, a stroke frequency of between about 50 and about 800 Hz, and a cutting speed in the forward direction (52) of between about 0.1 and about 4 meters per second.
15. Use of the cutting machine blade (1) according to one of Claims 1 to 13 when fitted in a cutting machine having a cutting tool.

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