CUTTING TOOL

Description

[0001] The present invention relates to a cutting tool for separating a non-metallic material, comprising a holding element, a cutting element held on the holding element for cutting contact with the non-metallic material, and a boundary region adjacent to a holding material region of the holding element and a cutting material region of the cutting element.

[0002] The present invention lies in the field of cutting, in particular by setting a cutting tool of the type mentioned at the outset into an oscillating vibration with a frequency of, for example, 20,000 strokes per minute or more at a relatively small amplitude, of a non-metallic material, in particular one which can usually be cut with a relatively low cutting force, in particular by machining, such as, for example, wood or woods, a plastic or plastics, a fiber composite material or fiber composite materials, an organic material or organic materials, a gypsum or gypsums, aerated concrete or aerated concrete, i.e. a porous concrete or concrete, in each case based on lime, lime-cement or cement mortar, or a bone material or bone materials, in each case of human or animal origin.

[0003] The cutting tools of the type mentioned above include, in particular, corresponding saw blades or blades.

[0004] A cutting tool of the type mentioned above in the form of a saw blade is already known from EP 2 295 211 B1. However, cutting a non-metallic material, particularly—but not exclusively—when it is bone material of human or animal origin, with such a cutting tool is complicated by the fact that the cutting tool sometimes deviates in an uncontrolled manner from a cutting or cutting direction usually—but not exclusively—predetermined by manual guidance. Such a deviation can also be referred to as breakage of the cutting tool.

[0005] EP 1 558 419 A2 shows a bone saw blade.

[0006] US 2019 / 054552 A1 shows an oscillating blade.

[0007] DE 10 2013 203613 A1 shows a cutting tool according to the preamble of claim 1, in particular a plunge-cut saw blade.

[0008] US 5 178 626 A shows a surgical saw blade.

[0009] US 2010 / 010492 A1 shows a miniature shredder for medical applications.

[0010] The object of the present invention is therefore to provide a cutting tool of the type mentioned at the outset, with which a more precise separation, in particular - but not only - of bone materials of human or animal origin, is possible.

[0011] This object is achieved by a cutting tool having the features of claim 1. Advantageous further developments can be found in the dependent claims.

[0012] The cutting tool for separating a non-metallic material comprises a holding element, a cutting element held on the holding element for cutting contact with the non-metallic material, and a boundary region adjacent to a holding material region of the holding element and a cutting material region of the cutting element, wherein a deformation resistance against an elastic deformation of the holding material region is greater than a deformation resistance against an elastic deformation of the cutting material region.As a result, the cutting tool is stabilized against elastic deformation in the region of the holding element, which may, for example, be plate-shaped, so that the cutting element, which may have cutting teeth, is pressed against the more rigid holding element in the sense of an abutment during cutting, which, for example, promotes cutting along a predetermined, in particular straight, cutting line; this cutting line can, in particular, be marked on and / or at a bone, a wooden workpiece, a plastic workpiece, a fiber composite workpiece, an organic workpiece, a gypsum workpiece, or a gas concrete workpiece. This can be further improved by dimensioning the cutting element shorter than the holding element along a longitudinal direction of the cutting tool, in particular if the cutting element and the holding element are each plate-shaped.The mounting element and the cutting element are integrally connected to one another. The boundary region comprises or consists of a bonding material, such as a solder and / or an adhesive material, or a material mixture comprising or consisting of materials of the mounting element and the cutting element, as well as optionally additional materials obtainable from a bonding source, for example, a welding agent, in particular a welding wire. The latter can be obtained, for example, by producing a welded joint between the mounting element and the cutting element, after which, in this example, the boundary region can be referred to as a weld seam or the like.

[0013] Preferably, the holding material region and the cutting material region are arranged opposite one another, particularly in a plan view of the cutting tool. This provides even more stable support for the cutting element.

[0014] The boundary region, which can also be referred to as the first boundary region, refers in particular to a region which is or can be formed, at least in sections, due to a force-fitting and / or form-fitting and / or material-fitting connection between the holding element and the cutting element. In a plan view of the cutting tool, in particular when the holding element is plate-shaped, a connecting line which runs within the boundary region can be assigned to the course of the boundary region, wherein the connecting line preferably connects at least two, preferably diametrical outer edges, of the cutting tool to one another. The connecting line preferably opens into at least one outer edge region of the cutting tool. The connecting line can be straight, curved, or sectionally straight or sectionally curved.The connecting line can run perpendicular to or parallel to the longitudinal axis. The connecting line can also be assigned an orientation intermediate between these two.

[0015] The boundary region may comprise, or preferably consist of, a material mixture region. The material mixture region may preferably be based on, or preferably consist of, material from the holder material region and material from the cutting element region. Alternatively or additionally, the material mixture region may be based on, or preferably consist of, a material bonding material, for example, a solder and / or an adhesive material.

[0016] Particularly preferably, the cutting tool is designed as an oscillating saw blade, wherein the oscillating saw blade can be set into oscillating vibration with a predetermined stroke via a drive shaft, in particular a motor shaft, of a drive unit, in particular a motor, preferably an electric motor, so that the cutting element, in the region of a free end, which has cutting teeth, which can also be referred to as saw teeth, can be oscillated parallel and / or perpendicular to a separation direction, which can also be referred to as the cutting direction. This enables particularly precise oscillating separation of the non-metallic material.

[0017] It is even more preferred if the cutting tool, designed as an oscillating saw blade, is operatively connected to the motor, thus providing an oscillating saw. It is particularly preferably operatively connected to the motor via a gear mechanism, in particular a gear shaft of the gear mechanism.

[0018] Cutting contact specifically means that the non-metallic material is machined.

[0019] By comprising the holding element and the cutting element, the cutting tool is accordingly constructed in two parts. However, a multi-part design with three or more elements is also conceivable and possible, such as an additional connecting element for positive connection to a drive element of a drive unit. According to a further development of the cutting tool, the deformation resistance of the holding material region and the deformation resistance of the cutting material region are each a bending deformation resistance. This stabilizes the cutting of the non-metallic material, particularly against bending deformation.Such stabilization can be achieved, in particular, by ensuring that the product of a modulus of elasticity of a material in the holding material region and an area moment of inertia of the holding material region is greater than the product of a modulus of elasticity of a material in the cutting material region and an area moment of inertia of the cutting material region. These products can also be referred to as the flexural rigidities of the holding material region and the cutting material region, respectively.The area moments of inertia are preferably determined with respect to a bending axis, which is defined in the geometric sense and which, apart from its position along a longitudinal axis of the cutting tool, is positioned in the same way with respect to the holding element and the cutting element, for example at half of a height measured in the cross-sectional section of the holding element and the cutting element in the case of a horizontal bending axis.

[0020] The holding material region consists of a holding material, and the cutting material region consists of a cutting material that differs from the holding material. This allows, on the one hand, the flexural rigidity of the cutting tool to be increased by selecting the holding material, for example, based on its modulus of elasticity, and, on the other hand, the cutting material to be selected based on its suitability for optimizing the cutting element intended for cutting contact with the non-metallic material. This latter suitability can be expressed, for example, by the ability to produce cutting teeth with defined cutting tooth flanks, particularly in a reproducible manner. Steel, in particular, is a suitable cutting material for this purpose.

[0021] Preferably, the holding element is made of the holding material, which contributes to an even better stabilization of the cutting element during cutting.

[0022] Preferably, the cutting element consists of the cutting material, according to which the cutting element can be selected, with a suitable choice of the cutting material, for cutting a specific non-metallic material and / or for absorbing reaction forces and thermal loads which can act on the cutting element during cutting.

[0023] The elastic modulus of the holding material is greater than the elastic modulus of the cutting material. This advantageously increases the flexural rigidity of the cutting tool while avoiding the need for special design measures. For example, the elastic modulus of the holding material can be greater than the elastic modulus of the cutting material by a factor of 1.1 to 5 or more. Preferred values ​​of this range, i.e. the factor, are 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3.0, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9 or 5.0.

[0024] The elastic modulus of the cutting material and the holding material also refers in particular to the component or components of an elasticity tensor that can be assigned to the cutting material and the holding material and that is relevant for the respective elastic deformation of the cutting material region and the holding material region, provided that the cutting material and the holding material are elastically anisotropic.

[0025] Preferably, the holding element consists of the holding material area, which contributes to an even better stabilization of the cutting tool during cutting.

[0026] Preferably, the cutting element consists of the cutting material region, according to which the cutting element can be selected, with a suitable choice of the cutting material region, for cutting a specific non-metallic material and / or for absorbing corresponding reaction forces which can act on the cutting element during cutting.

[0027] According to a further development of the cutting tool, the holder material comprises a material matrix with a matrix ductility and hard material particles arranged in the material matrix with a particle ductility that is lower than the matrix ductility. Thus, the holder material is provided in the form of a composite material to further increase the flexural rigidity and wear resistance of the cutting tool. The hard material particles can consist, for example, of tungsten carbide (WC) and the material matrix of cobalt (Co) or a solid solution based on cobalt (Co). Accordingly, the holder material is a hard metal ( cemented carbide ) .Preferably, the hard material particles made of WC are less than or equal to 20 µm, preferably less than or equal to 20 µm, 19 µm, 18 µm, 17 µm, 16 µm, 15 µm, 14 µm, 13 µm, 12 µm, 11 µm, 10 µm, 9 µm, 8 µm, 7 µm, 6 µm, 5 µm, 4 µm, 3 µm, 2 µm, 1 µm, 0.5 µm, 0.4 µm, 0.3 µm, 0.2 µm or 0.1 µm. The cobalt content, in elemental form or as a solid solution, based on the total composition of the holder material is preferably 3 to 30 percent by weight (preferred values, i.e. percent by weight, in this range are 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29 or 30); the corresponding remainder is formed by the hard material particles made of WC and optionally other hard material particles such as vanadium carbide (VC), chromium carbide (Cr 2 C 3 ) and / or tantalum niobium carbide (Ta,Nb)C.Alternatively or additionally, the hard material particles can consist of titanium carbide (TiC), titanium nitride (TiN), and / or tantalum carbide (TaC), and the material matrix can consist of niobium (Nb), molybdenum (Mo), or cobalt (Co), or corresponding solid solutions of these elements. In this case, the support material is a cermet (. cermet ) .Preferably, the hard material particles made of titanium carbide (TiC), titanium nitride (TiN) and / or tantalum carbide (TaC) are less than or equal to 20 µm, preferably less than or equal to 20 µm, 19 µm, 18 µm, 17 µm, 16 µm, 15 µm, 14 µm, 13 µm, 12 µm, 11 µm, 10 µm, 9 µm, 8 µm, 7 µm, 6 µm, 5 µm, 4 µm, 3 µm, 2 µm, 1 µm, 0.5 µm, 0.4 µm, 0.3 µm, 0.2 µm or 0.1 µm. Preferably, the niobium (Nb), molybdenum (Mo), or cobalt (Co) content, each in elemental form or as a solid solution, based on the total composition of the support material is 3 to 30 weight percent (preferred values, i.e., weight percents, within this range are 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30); the corresponding remainder is formed by the hard material particles of titanium carbide (TiC), titanium nitride (TiN), and / or tantalum carbide (TaC), and optionally other hard material particles. Preferably, the support material is nickel-free when provided as a cermet.

[0028] According to a further development of the cutting tool, the holder material is a ceramic material, a refractory metal or a mixture thereof.

[0029] This provides the holding material to further increase the flexural rigidity. The refractory metal can be, for example, a molybdenum or tungsten metal, which can each advantageously be formed and / or primary formed into the holding element and at the same time has a relatively high modulus of elasticity to advantageously increase the flexural rigidity. The ceramic can be, for example, an oxide ceramic based on aluminum oxide, magnesium oxide, zirconium oxide, or titanium dioxide. Preferably, the oxide ceramic is a zirconium-reinforced aluminum oxide ceramic. Alternatively, the ceramic can be a substantially, preferably entirely, oxide-free ceramic, i.e., in particular, a ceramic based on carbides, nitrides, borides, and / or silicides.

[0030] According to a further development of the cutting tool, the holding element is monolithic. This provides a particularly rigid cutting tool. Monolithic means, in particular, that a homogeneous material path is formed from any end of the holding element to any other end of the holding element.

[0031] According to a further development of the cutting tool, the cutting material is a metallic material, in particular a steel, and the ductility of the cutting material is greater than the ductility of the holding material. As a result, the cutting material is provided as a relatively ductile material compared to the holding material, which, for example, enables the production of cutting teeth in and / or on a cutting element blank, from which the cutting element can be or is produced, with defined tooth flanks in a simplified, preferably reproducible, manner, in particular by punching in combination with optional further manufacturing steps such as grinding, milling, sawing, or the like. The ductility of the cutting material and the holding material can be measured based on a uniform elongation or elongation at break obtainable from a tensile test.The elongation at break of the cutting material in the form of the metallic material, in particular steel, is preferably at least a factor of 2 to 50 greater than the elongation at break of the holding material. Preferred values ​​of this range, i.e. the factor, are 50, 49, 48, 47, 46, 45, 44, 43, 42, 41, 40, 39, 38, 37, 36, 35, 34, 33, 32, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3 or 2.

[0032] According to a further development of the cutting tool, the holding material region and the cutting material region are integrally connected to one another by means of an adhesive connection, a soldered connection, or a welded connection, in particular a beam-welded connection. This provides a particularly advantageous integral connection between the holding material region and the cutting material region. The beam-welded connection specifically means that the melting energy required to melt the holding material and / or the cutting material is available from one or more laser beams and / or electron beams.

[0033] According to a further development of the cutting tool, the boundary region is formed so as to extend between two outer edge points of the cutting tool. This is a particularly advantageous measure for the stable, particularly material-to-material connection of the cutting element to the mounting element. This can be achieved, for example, in the form of a weld seam or the like. Preferably, the mounting material region and the cutting element material region extend between the two outer edge points.

[0034] According to a further development of the cutting tool, the boundary region opens into a first outer edge region of the cutting tool and a second outer edge region of the cutting tool. This is a particularly advantageous measure for the stable, particularly material-to-material connection of the cutting element to the mounting element. The two outer edge regions can be arranged at the same or different longitudinal axis positions relative to a longitudinal axis of the cutting tool. The two outer edge regions can be connected by means of a connecting line which is oriented parallel, perpendicular or at an angle different from 90°, for example 0° to 89°, preferably 1°, 2°, 3°, 4°, 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70°, 75°, 85°, 89°, relative to a longitudinal axis of the cutting tool.The two outer edge regions can preferably each be surface regions of different side surfaces, which are preferably each smaller than a surface of the holding element of the cutting tool visible in a plan view of the holding element, which can be seen in corresponding side views of the cutting tool.

[0035] According to a further development of the cutting tool, at least two outer edge points of the cutting tool are arranged between the holding material region and the cutting material region in a plan view of the cutting tool. As a result, the holding material region advantageously forms, for example, a material bonding surface to which the cutting element can be or is materially bonded to the holding element. The outer edge points can be connected by a connecting line that runs perpendicular to a longitudinal axis or at an angle to the longitudinal axis, in particular in a plane of the holding element, for example, transversely thereto.

[0036] The material bonding surface, which is preferably an end face of the mounting element, which can be plate-shaped, can contact a correspondingly shaped contact surface of the cutting element essentially, preferably entirely, without a gap, whereby a particularly advantageous, contact-maximizing material bond between the cutting element and the mounting element can be realized. The material bonding surface and the contacting surface can then preferably be present as flat surfaces or as a convex-concave surface pair. In the latter case, the material bonding surface is preferably concave and the contacting surface is correspondingly convex.

[0037] According to a further development of the cutting tool, an outer region of the support material area has a chamfer or edge rounding, at least in sections. These measures advantageously minimize the risk of an otherwise rectangular outer edge of the support material area breaking, at least partially, and thus promoting further crack growth.

[0038] According to a further development of the cutting tool, two outer edges of the support material area are connected by a convex chord. This measure advantageously minimizes the risk of an otherwise rectangular outer edge of the support material area breaking, at least partially, and thus promoting further crack growth.

[0039] According to a further development of the cutting tool, the cutting tool comprises a connecting element for positive connection to a drive element of a drive unit, wherein the connecting element is held on the holding element, a boundary region, which can also be referred to as a second boundary region to distinguish it from the boundary region adjacent to the holding material region and the cutting material region, is formed between the connecting element and the holding element, and a ductility of a connecting material of the connecting element is greater than a ductility of the holding material. This advantageously provides the cutting tool with a connection to the drive element, which can in particular be a motor shaft of an electric motor or an output shaft of a transmission connected to the motor shaft.Furthermore, the connecting material is provided as a relatively ductile material compared to the mounting material, which makes it particularly easy to produce a recess for positive connection to the drive element, for example, by punching, sawing, or milling. The ductility of the connecting material and the mounting material can be measured based on a uniform elongation or elongation at break obtained from a tensile test. The elongation at break of the connecting material is preferably at least a factor of 2 to 50 greater than the elongation at break of the mounting material. Preferred values ​​of this range, i.e. of the factor, are 50, 49, 48, 47, 46, 45, 44, 43, 42, 41, 40, 39, 38, 37, 36, 35, 34, 33, 32, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3 or 2. The connecting element is preferably plate-shaped.The connecting element and the holding element are preferably positively connected to one another. Preferably, a deformation resistance to elastic deformation of a holding material region of the holding element adjacent to the second boundary region is greater than a deformation resistance to elastic deformation of a connecting material region of the connecting element adjacent to the second boundary region. Preferably, the elastic deformation of the holding material region and the elastic deformation of the connecting material region are each a bending deformation. Preferably, the holding material region consists of the holding material and the connecting material region consists of a connecting material different from the holding material. Preferably, a modulus of elasticity of the holding material is greater than a modulus of elasticity of the connecting material. Preferably, the holding material is a hard metal (. cemented carbide ), a cermet ( cermet ), a ceramic material, a refractory metal, or a mixture thereof. Preferably, the support material region adjacent to the second boundary region is the support material region adjacent to the (first) boundary region. Preferably, the connecting element is monolithic.

[0040] According to a further development of the cutting tool, the connecting material is a metallic material, in particular steel. This is advantageously a particularly easy-to-machine and relatively inexpensive material for producing a recess in the connecting element for positive connection to the drive element.

[0041] According to a further development of the cutting tool, the mounting element and the connecting element are integrally connected to one another by means of an adhesive connection, a soldered connection, or a welded connection, in particular a beam-welded connection. This provides a particularly advantageous integral connection between the mounting element and the connecting element. The beam-welded connection specifically means that the melting energy required to melt the mounting material and / or the connecting material is available from one or more laser beams and / or electron beams.

[0042] According to a further development of the cutting tool, a first surface and a second surface adjacent to the first surface are arranged in a longitudinal section of the cutting tool, forming an inner edge angle of less than 180°. This advantageously reduces the risk of collision of a drive unit connected to the cutting tool with the non-metallic material, particularly for achieving rectilinear guidance of the cutting tool when the cutting element makes contact, particularly almost, with another component. This can also be referred to as offsetting the cutting tool. Preferably, the inner edge angle, which can also be referred to as the first inner edge angle, is less than or equal to 180°, 175°, 170°, 165°, 160°, 155°, 150°, 145°, 140°, 135°, 130°, 125°, 120°, 115°, 110°, 105°, 100°, 95° or 90°.Preferably, the inner edge angle is greater than 90° and less than 180°, including 175°, 170°, 165°, 160°, 155°, 150°, 145°, 140°, 135°, 130°, 125°, 120°, 115°, 110°, 105°, 100°, 95°. Preferably, a jigsaw and / or plunge-cut saw blade is optionally provided in the form of the cutting tool. Preferably, the first and second surfaces are surfaces of the optional connecting element and / or the holding element. Preferably, one of the surfaces is a surface of the holding element and the other is a surface of the connecting element. Preferably, one of the surfaces is a surface of the holding element and the other is a surface of the cutting element.

[0043] According to a further development of the cutting tool, an axial dimension of the boundary region and / or the second boundary region is smaller than an axial dimension of the mounting element. This advantageously allows for the elastic deformation to be localized, for example, in the form of a maximum of a bending line, outside the boundary region or the second boundary region. The term "axial dimension" refers, in particular, to a dimension parallel to a longitudinal axis of the cutting tool.

[0044] According to a further development of the cutting tool, an axial dimension of the mounting element is greater than or equal to an axial dimension of the cutting element. This advantageously further increases the flexural rigidity of the cutting tool. The term "axial dimension" refers, in particular, to a dimension parallel to a longitudinal axis of the cutting tool.

[0045] According to a further development of the cutting tool, the boundary region and / or second boundary region is / are linear, particularly in a plan view of the cutting tool. According to this, the boundary region or the second boundary region is, for example, a weld seam, a soldered seam, or an adhesive seam.

[0046] According to a further development of the cutting tool, the mounting element has a taper, preferably transverse to a longitudinal axis of the cutting tool. This is a particularly advantageous shape of the mounting element. The taper is preferably formed at the boundary region and / or the second boundary region.

[0047] The cutting element has cutting teeth. This advantageously increases the cutting performance of the cutting tool. The cutting teeth preferably form a row of cutting teeth consisting of, for example, at least 10 or more, for example more than 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 250, 300, 350, 400, 500, 600, 700, 800, 900, or 1000 cutting teeth, triangular teeth tapering outwards. A boundary line can preferably be assigned to the row of cutting teeth, which can preferably be straight or round. The cutting teeth are preferably arranged interlaced with one another.

[0048] According to a further development of the cutting tool, the cutting tool is designed to be manually guided. This allows the cutting tool to be guided along a cutting line, particularly with relatively little effort. Preferably, the cutting tool according to this further development can be connected to a hand-held power tool and / or a hand-held power tool.

[0049] According to a further development, the cutting tool is preferably plate-shaped. This is a particularly easy-to-manufacture shape.

[0050] According to a further development of the cutting tool, a thickness dimension can be assigned to it in a side view, wherein a corresponding thickness is preferably variable along a longitudinal axis of the cutting tool, in particular in the region of the holding element and / or the cutting element and / or the connecting element. Preferably, the thickness is greater in the region of the connecting element than in the region of the cutting element. This contributes to further stabilizing the cutting tool. Alternatively, the thickness can be constant in the region of the holding element and the cutting element, and optionally in the region of the connecting element, wherein preferably the thickness in the region of the holding element can be different from the thickness in the region of the cutting element and / or the connecting element. If the thickness in these regions is the same in terms of amount, the cutting tool can be manufactured particularly cost-effectively, in particular by means of grinding or the like.

[0051] According to a further development of the cutting tool, a width dimension, i.e. width, can be assigned to it in a plan view, wherein a corresponding width is preferably variable along a longitudinal axis of the cutting tool, in particular in the region of the holding element and / or the cutting element and / or the connecting element. Preferably, the width is greater in the region of the connecting element than in the region of the cutting element. This contributes to further stabilizing the cutting tool. Alternatively, the width can be constant in the region of the holding element and the cutting element and optionally in the region of the connecting element, wherein preferably the width in the region of the holding element can be different from the width in the region of the cutting element and / or the connecting element.

[0052] According to a further development of the cutting tool, a width dimension, i.e., a width, can be assigned to it in a plan view and a thickness dimension, i.e., thickness, can be assigned to it in a side view. A corresponding width and a corresponding thickness are preferably variable along a longitudinal axis of the cutting tool, particularly in the region of the holding element and / or the cutting element and / or the connecting element. Preferably, the width and / or the thickness are greater in the region of the connecting element than in the region of the cutting element. This contributes to further stabilizing the cutting tool.Alternatively, the width and / or thickness can be constant in the region of the holding element and the cutting element and optionally in the region of the connecting element, wherein preferably the thickness and / or width in the region of the holding element can be different from the thickness and / or width in the region of the cutting element and / or the connecting element.

[0053] Further advantages and benefits of the invention will become apparent from the following description of embodiments with reference to the accompanying figures.

[0054] From the figures show: Fig. 1: a schematic representation of a cutting tool according to a first embodiment in plan view; Fig. 2: a schematic representation of the cutting tool according to Fig. 1 in a side view; Fig. 3: a schematic representation of a cutting tool according to a second embodiment in plan view; Fig. 4: a schematic representation of a cutting tool according to a third embodiment in plan view; Fig. 5: a schematic representation of the cutting tool according to Fig. 4 in a side view; Fig. 6: a schematic representation of a cutting tool according to a fourth embodiment in plan view; Fig. 7: a schematic representation of the cutting tool according to Fig. 6 in a side view; Fig. 8: a schematic representation of a cutting tool according to a fifth embodiment in plan view; Fig. 9: a schematic representation of the cutting tool according to Fig. 8 in a side view; Fig. 10: a schematic representation of a cutting tool according to a sixth embodiment in plan view; and Fig. 11: a schematic representation of the cutting tool according to Fig. 10 in a side view.

[0055] In the Figuren 1 bis 11 Identical, similar or equivalent elements are designated by identical reference symbols and a repeated description of these elements is omitted in the following description in order to avoid redundancies.

[0056] Fig. 1 and 2 show a schematic representation of a plate-shaped cutting tool 1 according to a first embodiment in plan view and in a side view, respectively. The cutting tool 1 is realized in the form of an oscillating saw blade, which can be moved in an oscillating manner along the directions 2 at a frequency of, for example, 20,000 strokes per minute. During such an oscillation, a plate-shaped cutting plate 3, which consists of a steel, is brought into contact with a non-metallic material, for example, a wood or a bone material. This is done by means of triangular cutting teeth 4, whose Fig. 1 The number shown was chosen merely as an example, the cutting plate 3 performs machining of the non-metallic material. A corresponding cutting depth or feed rate can be adjusted via an axial movement parallel to a longitudinal axis 5 of the cutting tool 1 in the direction of the cutting teeth 4. The cutting plate 3 is integrally connected to a mounting plate 6 via a weld seam 7. The weld seam 7, whose extension in the axial direction is considerably smaller than that of the mounting plate 6 and the cutting plate 3, thus forms a boundary area, which can also be referred to as a connection area, between the cutting plate 3 and the mounting plate 6. As a result, the mounting plate 6 can absorb the forces occurring during machining, which can also be referred to as cutting reaction forces. The mounting plate 6 is monolithic and consists of a hard metal ( cemented carbide ) with a modulus of elasticity of 650·10 9< N / m 2< ; however, other materials within the meaning of the present disclosure are also conceivable and possible. The cutting plate 3 is also monolithic, wherein it consists of a steel with a modulus of elasticity of 210·10 9< N / m 2<. Thus, the area 60 of the mounting plate 6 adjacent to the weld seam 7 is more rigid than the area 30 of the cutting plate 3 adjacent to the weld seam 7. This leads to the mounting plate 7 being able to withstand a deflection of the cutting element 4 in one of the directions perpendicular to the longitudinal axis 5, for example in the directions 2 or one of the directions perpendicular to the plane of the drawing of the Fig. 1 are oriented, and counteracts them in parallel, so that the influence of cutting reaction forces, which can act on the cutting plate 3 in the area of ​​the cutting teeth 4, on the position of the cutting plate 3 with respect to a stationary reference point located outside the cutting tool 1 is reduced. The reference point can thus, for example, be assigned to a clamping device for clamping and holding the non-metallic material. Since the cutting plate 3 is made of steel, the cutting teeth 4 can be produced by punching followed by grinding.

[0057] In Fig. 1 It is particularly clearly visible that the weld seam 7 extends across the entire width of the mounting plate 7 and the cutting plate 3, is linear, and is oriented perpendicular to the longitudinal axis (another orientation is also conceivable and possible, for example, in the case of a different cutting plate 3 and / or a different mounting plate 6, parallel to the longitudinal axis 5 or inclined relative to the longitudinal axis 5, i.e., in the latter case, running obliquely). The weld seam 7 can therefore be regarded in the geometric sense as a connecting line between two points 100 and 110 of corresponding outer edges 500 of the cutting tool 1.

[0058] The support plate 6 is further connected to a connecting plate 8 via another weld seam 9. The connecting plate 8 is also monolithic, being made of a steel with a modulus of elasticity of 210 10 9 < N / m 2 <. Since the connecting plate 8 is made of steel, a concave recess 80 of the connecting plate 8 is obtainable by punching, wherein the recess 80 is shaped to correspond to a drive shaft (not shown) of an electric motor, so that the cutting tool 1 can be driven by the electric motor to execute the oscillating movements in the directions 2. In this way, an electric tool is provided.

[0059] In Fig. 2 It is particularly clear that the cutting tool 1 has a constant thickness, which can also be referred to as plate thickness, which is consequently the same in terms of amount in the area of ​​the cutting plate 3, the holding plate 6 and the connecting plate 8.

[0060] Fig. 3 shows a schematic representation of a plate-shaped cutting tool 1' according to a second embodiment in a top view and a side view. The cutting tool 1' is constructed analogously to the cutting tool 1, wherein, in contrast to the cutting tool 1, a connecting plate 8', which consists of the steel of the connecting plate 8, has a recess 80a with radial projections 800a and an axial plug-in groove 810a, which are shaped to correspond to a drive shaft (not shown) of the electric motor in order to transmit more form-locking forces to the cutting tool 1' than the recess 80. Furthermore, the connecting plate 8' is longer in the axial direction than the connecting plate 8 of the cutting tool 1, which increases the surface contact with a clamping device of a power tool drive unit. Furthermore, the cutting plate 3' is shorter in the axial direction than the cutting plate 3, which makes the cutting plate 4' more rigid.The number of cutting teeth 4' is, for example, larger than the number of cutting teeth 4.

[0061] Fig. 4 and 5 show a schematic representation of a plate-shaped cutting tool 1" according to a third embodiment in plan view and in a side view. The cutting tool 1" is constructed analogously to the cutting tool 1, wherein the cutting element 3", which consists of the steel of the cutting element 3, is shown without cutting teeth and a connecting plate 8", which consists of the steel of the connecting plate 8, has a recess 80b with a plug-in groove 800b.

[0062] In Fig. 5 It is particularly clearly evident that the cutting tool 1" has a constant thickness, which can also be referred to as plate thickness, in the area of ​​the cutting plate 3" and the holding plate 6, which is the same in terms of amount in these areas, and a constant thickness, i.e. plate thickness, in the area of ​​the connecting plate 8", which is greater than the plate thickness in the areas of the cutting plate 3" and the holding plate 6.

[0063] Fig. 6 and 7 show a schematic representation of a plate-shaped cutting tool 1‴ according to a fourth embodiment in plan view and in a side view, respectively. The cutting tool 1‴ is constructed analogously to the cutting tool 1", whereby, as can be seen from Fig. 7 It is particularly evident that the thickness, i.e. plate thickness, of the cutting tool 1‴ in the area of ​​a mounting plate 6‴, starting at the weld seam 7 at a thickness corresponding to the thickness of the cutting plate 3‴, continuously increases until the thickness of the connecting plate 8‴ is reached at the weld seam 9. The mounting plate 6‴ consists of the hard metal (cemented carbide) the mounting plate 6.

[0064] Fig. 8 and 9 show a schematic representation of a plate-shaped cutting tool 1ʺʺ according to a fifth embodiment in plan view and in a side view. The cutting tool 1ʺʺ is constructed analogously to the cutting tool 1‴, wherein a mounting plate 6ʺʺ, as shown in Fig. 8 as can be seen particularly clearly, has a width measured transversely to the longitudinal axis 2, which becomes continuously smaller from the weld seam 9 to the weld seam 7; at the weld seam 9, the width corresponds to an analogously measured width of the connecting plate 8". Thereafter, the cutting tool 1ʺʺ has a taper, specifically in the area of ​​the mounting plate 6ʺʺ. The width of the mounting plate 6ʺʺ corresponds at the weld seam 7 to the distance between points 100ʺʺ and 110ʺʺ of corresponding outer edges of the cutting tool 1ʺʺ. The mounting plate 6ʺʺ consists of the hard metal (cemented carbide) the mounting plate 6.

[0065] Fig. 10 and 11 show a schematic representation of a plate-shaped cutting tool 1‴ʺ according to a sixth embodiment in plan view and in a side view. The cutting tool 1‴ʺ is constructed analogously to the cutting tool 1', whereby, as can be seen from Fig. 11 particularly clearly visible, a connecting plate 8‴ʺ, which consists of the steel of the connecting plate 8, two adjacent surfaces 1000 and 1100, which in the side view according to Fig. 11 analogous to a corresponding longitudinal section in the profile, form an inner edge angle of 135°. In this way, the cutting tool 1‴ʺ is offset in the area of ​​the connecting plate 8‴ʺ in such a way that, compared to the cutting tool 1, for example, a Fig. 11 apparent distance 1200 transverse to the longitudinal axis 5 in the area of ​​the connecting plate 8‴ʺ is obtained, so that the distance 1200 can be used in the sense of an additional assembly space for connecting to an electric motor of a drive unit or the like, whereby - while adhering to the limits of the distance 1200 - a cutting plate 3‴ʺ can simultaneously cut a substrate or the like parallel to its Fig. 10 visible areal extent. A transition from surface 1000 to surface 1100 or vice versa is indicated by a dashed line 1300, which runs parallel to a transverse axis, in Fig. 10 The connecting plate 8‴ʺ has a radially closed recess 80c with projections 800c for positive connection to a shaft of an electric motor.

[0066] The cutting plate 3‴ʺ, which consists of the steel of the cutting plate 3, is longer than the cutting plate 3' in order to gain axial machining space for separating the non-metallic material.

Claims

1. Cutting tool (1, 1', 1'', 1‴, 1ʺʺ, 1‴ʺ) for severing a non-metallic material, comprising a holding element (6, 6", 6‴, 6ʺʺ), a cutting element (3, 3', 3'', 3‴ʺ), which is held on the holding element (6, 6'', 6‴, 6ʺʺ) for the purpose of making cutting contact with the non-metallic material, and a boundary region (7), which adjoins a holding material region (60) of the holding element (6, 6'', 6‴, 6ʺʺ) and a cutting material region (30) of the cutting element (3, 3', 3'', 3‴ʺ), wherein a deformation resistance to elastic deformation of the holding material region (60) is greater than a deformation resistance to elastic deformation of the cutting material region (30), wherein the holding element (6, 6", 6‴, 6ʺʺ) and the cutting element (3, 3', 3", 3‴ʺ) are connected to one another in a materially bonded manner, wherein the cutting element (3, 3', 3'', 3‴ʺ) has cutting teeth (4), characterized in that the holding material region (60) consists of a holding material and the cutting material region (30) consists of a cutting material, which is different from the holding material, wherein a modulus of elasticity of the holding material is greater than a modulus of elasticity of the cutting material.

2. Cutting tool (1, 1', 1'', 1‴, 1ʺʺ, 1‴ʺ) according to Claim 1, wherein each of the deformation resistance of the holding material region (60) and the deformation resistance of the cutting material region (30) is a bending deformation resistance.

3. Cutting tool (1, 1', 1'', 1‴, 1ʺʺ, 1‴ʺ) according to either of the preceding claims, wherein the holding material has a material matrix with a matrix ductility and has hard material particles, arranged in the material matrix, with a particle ductility, which is smaller than the matrix ductility.

4. Cutting tool (1, 1', 1'', 1‴, 1ʺʺ, 1‴ʺ) according to one of the preceding claims, wherein the holding material is a ceramic material, a refractory metal or a mixture thereof.

5. Cutting tool (1, 1', 1'', 1‴, 1ʺʺ, 1‴ʺ) according to one of the preceding claims, wherein the holding element (6, 6", 6‴, 6ʺʺ) is monolithic.

6. Cutting tool (1, 1', 1'', 1‴, 1ʺʺ, 1‴ʺ) according to one of the preceding claims, wherein the cutting material is a metallic material, in particular a steel, and a ductility of the cutting material is greater than a ductility of the holding material.

7. Cutting tool (1, 1', 1'', 1‴, 1ʺʺ, 1‴ʺ) according to one of the preceding claims, wherein the holding material region (60) and the cutting material region (30) are connected to one another in a materially bonded manner by means of an adhesive connection, a soldered connection or a welded connection (7), in particular a beam welded connection.

8. Cutting tool (1, 1', 1'', 1‴, 1ʺʺ, 1‴ʺ) according to one of the preceding claims, wherein the boundary region (7) is formed so as to extend between two outer edge points (100, 110, 100ʺʺ, 110ʺʺ) of the cutting tool (1, 1' , 1'', 1‴, 1ʺʺ, 1‴ʺ).

9. Cutting tool (1, 1', 1'', 1‴, 1ʺʺ, 1‴ʺ) according to one of the preceding claims, wherein an outer region of the holding material region (60) at least sectionally has a bevel or an edge rounding.

10. Cutting tool (1, 1' , 1'', 1‴, 1ʺʺ, 1‴ʺ) according to one of the preceding claims, wherein two outer edges (500) of the holding material region (60) are connected by a convex chord.

11. Cutting tool (1, 1', 1'', 1‴, 1ʺʺ, 1‴ʺ) according to one of the preceding claims, wherein the cutting tool (1, 1', 1", 1''', 1ʺʺ, 1‴ʺ) comprises a connecting element (8, 8', 8'', 8‴ʺ) for form-fitting connection to a drive element of a drive unit, wherein the connecting element (8, 8', 8", 8‴ʺ) is held on the holding element (6, 6'', 6‴, 6ʺʺ), a boundary region (9) is formed between the connecting element (8, 8', 8'', 8‴ʺ) and the holding element (6, 6", 6‴, 6ʺʺ) and a ductility of a connecting material of the connecting element (8, 8', 8'', 8‴ʺ) is greater than a ductility of the holding material.

12. Cutting tool (1, 1' , 1'', 1‴, 1ʺʺ, 1‴ʺ) according to Claim 11, wherein the connecting material is a metallic material, in particular a steel.

13. Cutting tool (1, 1', 1'', 1‴, 1ʺʺ, 1‴ʺ) according to Claim 11 or 12, wherein the holding element (6, 6'', 6‴, 6ʺʺ) and the connecting element (8, 8', 8'', 8‴ʺ) are connected to one another in a materially bonded manner by means of an adhesive connection, a soldered connection or a welded connection (9), in particular a beam welded connection.

14. Cutting tool (1, 1', 1'', 1‴, 1ʺʺ, 1‴ʺ) according to one of the preceding claims, wherein, in a longitudinal section of the cutting tool (1, 1', 1'', 1‴, 1ʺʺ, 1‴ʺ), a first surface (1000) and a second surface (1100), which adjoins the first surface (1000), are arranged so as to form an internal edge angle of less than 180°.