Tool device

Abstract

The invention relates to a tool device (28), in particular a tool device (28) to be translationally driven along a movement axis (30) by means of a hand-held power tool (12), having a holding unit (36), in particular for holding the tool device (28) on a hand-held power tool (12); a plurality of cutting elements (58), in particular cutting elements which form a cutting edge (56), in particular for machining a workpiece; and a plurality of receiving elements (80), in particular for integrally receiving the cutting elements (58). It is proposed that the receiving elements (80), in particular the two receiving elements, are spaced apart by varying distances when viewed transversely, in particular perpendicularly, to the movement axis (30).

Description

[0001] R. 417337

[0002] - 1 -

[0003] title

[0004] Tool setup

[0005] The invention relates to a cutting unit, receiving unit and / or holding unit for a cutting device according to the preamble of claim 1.

[0006] A large number of different cutting units, receiving units and / or holding units for cutting devices, in particular milling devices, are known from the prior art.

[0007] The invention is based on the objective of improving a tooling device using simple design measures.

[0008] The problem is solved with a tool device, in particular for a translational drive of the tool device along an axis of motion by means of a hand-held machine tool, with a holding unit, in particular for holding the tool device on a hand-held machine tool, with a plurality of cutting elements, in particular forming a cutting edge, in particular for machining a workpiece.

[0009] It may be advantageous for the tooling to have a large number of receiving elements, in particular for a material-bonded mounting of the cutting elements.

[0010] It may be advantageous for the, in particular two, receiving elements to be spaced at different distances from the axis of movement, especially when viewed perpendicular to the axis of movement.

[0011] The tooling unit can be designed for machining a workpiece. The tooling unit can be a sawing tool, in particular an R. 417337

[0012] - 2 -

[0013] The tool assembly may be designed to cut a workpiece using a jigsaw and / or reciprocating saw blade. It can be driven translationally by means of a back-and-forth movement along an axis of motion to cut a workpiece using a translational cutting motion in the forward and / or backward direction.

[0014] The machine tool can be handheld and / or hand-guided. The machine tool can be a jigsaw and / or a reciprocating saw. The machine tool can have a tool holder for mounting a tool assembly. The tool holder can have a clamping and / or a clamping unit for holding the tool assembly on the handheld machine tool. The tool holder can be movably mounted and perform a stroke movement along a stroke axis in an operating state. By means of the stroke movement, the tool holder can move the tool assembly along a motion axis. The stroke axis and the motion axis can essentially coincide. The motion axis may also coincide with a longitudinal axis of the tool assembly. It is understood that, depending on the mounting of the tool assembly on the handheld machine tool, the following applies:The tool holding unit can be given an initial deflection (for example, by a deflection of the holding unit relative to the cutting unit), which causes the axis of movement to deviate from the longitudinal axis of the tool fixture. The longitudinal axis can be described by the extension of the holding unit.

[0015] The axis of motion can be defined by the hand-held power tool. The axis of motion can be formed along a pendulum motion of a drive and / or driven unit of the hand-held power tool. The axis of motion can be formed along the stroke axis. The axis of motion can be formed along the longitudinal axis.

[0016] The holding unit can be used to hold the tool assembly on a hand-held power tool. The holding unit can extend along a longitudinal axis or axis of movement. The holding unit can be R. 417337

[0017] - 3 -

[0018] The holding unit must have a holding geometry. This geometry can consist of a holding contour, a holding surface, and / or a holding recess. The holding unit can be arranged at one end of the tool assembly and define its boundaries. In a receiving and / or operating state, the holding unit can be designed to be fully integrated into or attached to the hand-held power tool, particularly the tool holder. The holding unit can be free of cutting elements. The holding unit can be adapted to the tool holder.

[0019] Cutting element

[0020] The cutting element can be designed for machining a workpiece. The cutting element can have a single cutting direction. The cutting element can have a cutting geometry. The cutting element can have a cutting corner, in particular a cutting tip. The cutting element can be designed as a cutting tooth. The cutting tooth can have a cutting edge. The cutting element can have a clearance face. The cutting element can have a rake face facing away from the clearance face. The clearance face and the rake face can be tapered and, in particular, form a cutting edge, preferably with an acute angle, preferably with an angle of less than 90°. It is understood that angles greater than 90° may also be used in some cases. The cutting element can be wedge-shaped. The clearance face and the rake face can terminate in the cutting edge.The cutting element may have a base surface on a side facing away from the cutting edge. The base surface may be curved, in particular convex. The base surface may be designed as a joining surface. The base surface may extend from the clearance face to the rake face. The base surface may transition tangentially into the clearance face and / or the rake face. The base surface may be angled to the clearance face and / or the rake face. The base surface may be designed as a joining surface or connecting surface. The cutting element may have a coating, in particular a primer coating, on the base surface. The cutting element may be heat-treated. The cutting element may be coated. The cutting element may extend transversely to an axis of movement. R. 417337.

[0021] - 4 -

[0022] The tooling device can have a plurality of cutting elements. The cutting elements can be arranged in a series. The cutting elements can be uniformly spaced from one another. The cutting elements can have a cutting pitch or spacing, particularly a uniform one. The cutting elements can be made of a material that differs from the rest of the tooling device's material. The cutting elements can be spaced from adjacent cutting elements along the axis of movement and / or transversely, particularly perpendicularly, to the axis of movement. A support element (receiving element) can be arranged between the cutting elements, which supports the cutting elements and spaces them apart.

[0023] The cutting elements can form a cutting edge when viewed along the axis of motion. The cutting edge can come into direct contact with a workpiece and cut it. This cutting edge is formed by a series of cutting elements, in particular cutting teeth, arranged along the longitudinal side of the tool assembly. The cutting elements can have various shapes, arrangements, and sizes and can be adapted to the specific application of the tool assembly. The cutting edge can form a cutting edge front. The cutting edge can extend continuously along the axis of motion. The cutting edge can extend discretely along the axis of motion. The cutting edge can be formed by several cutting tooth edges. The cutting edge can be designed as a kind of trend line in a polynomial form along the cutting elements, in particular the cutting tooth edges of the cutting elements.The cutting edge can be formed from a multitude of, in particular successive, cutting edge segments. The cutting segments can be connected to one another. The cutting edge segments can be straight, curved, parallel to the axis of movement and / or angled to the axis of movement.

[0024] Although the following embodiments illustrate the invention using a reciprocating saw or jigsaw blade, the inventive concept is not limited to these. The principle, through a targeted arrangement of R. 417337

[0025] - 5 -

[0026] The ability to achieve a complex cutting edge geometry with constant cutting element height using mounting elements at varying distances from the axis of movement is equally advantageous for other types of cutting tools. In particular, the tool assembly can also be designed as an oscillating multi-tool blade or as a hole saw with segmented cutting inserts.

[0027] Recording elements

[0028] The receiving elements can be designed to receive cutting elements. A single receiving element can receive a single cutting element. A single receiving element can receive two or more cutting elements. The receiving elements can be arranged in a series. The receiving elements can be spaced apart from each other, in particular uniformly. The receiving elements can have a spacing between them, in particular uniformly. The receiving elements can be made of a material that differs from the material of the cutting elements. The receiving elements can be spaced apart from adjacent receiving elements along the axis of movement and / or transversely, in particular perpendicularly, to the axis of movement. The receiving elements can be arranged discretely along the axis of movement. The receiving element can have a receiving surface. The receiving surface can define the boundaries of the receiving element.The receiving surface can be designed as a joining surface. The receiving surface can be curved. The receiving surface can be flat. The receiving surface can be adapted to the cutting element, in particular the base surface, and / or form a negative shape. The receiving surface can be designed as a joining surface or a connecting surface for joining a single or a plurality of cutting elements. The receiving surface can be designed as a joining surface or a connecting surface. The receiving element can be materially bonded to the cutting element, in particular by means of a joining process, such as a soldering and / or welding process. For example, a laser welding process, a spot welding process, etc., is suitable. The receiving element can have a coating, in particular a coating of R. 417337.

[0029] - 6 -

[0030] The receiving element may have a primer coating. It may be tempered or coated. It may extend along the axis of movement. The receiving element is preferably designed as a support element. It may be designed as a tooth neck.

[0031] It may be advantageous for the receiving elements, in particular two elements, to be spaced at different distances transversely, and especially perpendicularly, to the axis of movement. One receiving element may have a first distance to the axis of movement. Another receiving element may have a second distance to the axis of movement. The first distance may differ from the second distance, in particular be greater and / or smaller. The distances may be measured perpendicular to the axis of movement. The receiving element may be arranged closer to the axis of movement than the second receiving element. A third receiving element may, in turn, be arranged further away from the axis of movement than the first receiving element and the second receiving element. Viewed along the axis of movement, the receiving element may be arranged between the second receiving element and the third receiving element.

[0032] The present invention provides a tooling device with a curved cutting edge, which, in addition to a curved or angled cutting edge profile, enables a cutting element height that is approximately similar to the other elements, within a tolerance or cutting angle. Current receiving elements are located at the same height relative to the axis of movement and are joined with cutting elements that, for example, are machined or ground down to achieve a curved cutting edge profile. This has disadvantages regarding the height of the cutting element, which is machined more extensively than the other cutting elements. In the present invention, the cutting edge and its profile are determined by the arrangement of the receiving elements in the support element and not by the intensity of machining a cutting element. This allows for evenly distributed [R. 417337]

[0033] - 7 - and held cutting elements are provided. This enables improved machining.

[0034] To further clarify the invention, the difference from the established prior art should be highlighted: In the prior art, the receiving elements are typically arranged at a straight, uniform height. The desired curved cutting edge (or profile) is created by intensive, material-removing grinding of the cutting elements themselves. However, this process inevitably leads to the cutting elements having significantly different residual volumes depending on their position along the curve. In particular, the most extensively ground cutting elements are mechanically weakened, more susceptible to chipping, and exhibit inconsistent bond strength to the carrier (receiving element).

[0035] The present invention reverses this principle. Instead of weakening the cutting elements, the desired geometry of the cutting edge is defined by the targeted, recessed arrangement of the receiving elements in the carrier element. In this way, essentially identical and voluminous cutting elements (58) can be joined, which retain their full mechanical stability and uniform joint quality. Material-weakening grinding is no longer necessary; only minor final sharpening is required. The decisive advantage thus lies in a significantly higher stability and service life of the entire tool assembly, since no cutting element represents an inherent weak point due to the manufacturing process.

[0036] It may be advantageous for the receiving elements to be arranged along the axis of movement. It may also be advantageous for the receiving elements to be spaced apart from each other along the axis of movement. It may be advantageous for the receiving element(s) to project transversely, in particular perpendicularly, to the axis of movement. The receiving element may project freely. The receiving element may be designed to carry or support a cutting element. The receiving element may be designed as a support element. The receiving element may be designed to extend the cutting element. For this purpose, the receiving element may be R. 417337

[0037] - 8 - is provided to hold the cutting element protruding. The receiving element can have a fixed end and a loose end facing away from the fixed end. The receiving element can have a rake face. The rake face can adjoin or merge into the cutting element, in particular a rake face of the cutting element. The receiving element can have a clearance face. The clearance face can adjoin or merge into the cutting element, in particular a clearance face of the cutting element. The rake face can be arranged on a side facing away from the clearance face. One, in particular each, surface normal of the rake face can be directed towards the holding unit. One, in particular each, surface normal of the clearance face can be directed away from the holding unit.

[0038] The tool assembly can have a recess, in particular a trough. The recess can be arranged between two, in particular each, adjacent receiving elements. The recess can separate the receiving elements from one another. The recess can be designed as a chip recess. The recess can be designed to receive or temporarily store chips in an operating state. The recess can have a clearance surface of a preceding receiving element and a rake face of a subsequent receiving element.

[0039] It can be advantageous for each receiving element to have a substantially, and in particular curved, preferably concave, receiving geometry. The receiving geometry can include a receiving surface, in particular curved, preferably concave. One, and in particular each, surface normal of the receiving surface can be directed away from the tool assembly. The receiving surface can be open downwards. The receiving geometry can surround, and in particular enclose, the cutting element on a side facing away from the cutting edge. This allows for an enlarged connection geometry.

[0040] It may be advantageous for the receiving elements to be curved, particularly concavely, along a receiving edge. R. 417337

[0041] - 9 -

[0042] The receiving edge section is arranged. The receiving edge can extend from the holding unit to an end of the tool fixture facing away from the holding unit. The receiving edge can be spaced apart from the cutting edge. The receiving edge can define an arrangement of the cutting elements on the tool fixture. The receiving edge can have multiple receiving edge sections. The receiving edge section can be formed from a plurality of receiving elements. The receiving edge section can form a receiving envelope. The receiving envelope can be formed from a trend line running tangentially to the receiving elements. If the cutting elements are identically or nearly identically designed, the receiving edge section can define the cutting edge section.

[0043] It may be advantageous for the receiving edge of the curved receiving edge section to have a radius of at least 500 mm, in particular 800 mm, preferably 1000 mm, preferably 1200 mm, particularly preferably 1400 mm, and / or of at most 3000 mm, in particular 2500 mm, preferably 2000 mm, particularly preferably 1500 mm.

[0044] It can be advantageous for the holding elements to be arranged along a holding edge with a straight holding edge section, the straight holding edge section being positioned between the holding unit and the curved holding edge section. This allows for a tool setup with multiple machining areas, adapted to the workpieces being machined.

[0045] It may be advantageous for the receiving elements to be arranged along a receiving edge with another straight receiving edge section, with the curved receiving edge section being arranged between the two straight receiving edge sections.

[0046] It may be advantageous for the straight receiving edge sections to connect to the curved receiving edge section on both sides and, in particular, to limit it along the axis of movement. The straight R. 417337

[0047] - 10 -

[0048] The receiving edge sections can be parallel to each other, especially coplanar.

[0049] It may be advantageous for the cutting edge to be adapted to the receiving edge and / or to run parallel to the receiving edge. The receiving edge may have a cutting edge profile adapted to the cutting edge.

[0050] It can be advantageous for the receiving elements and the cutting elements to be made of different materials. The cutting element can be made of a hard metal. The cutting element can be made of a ceramic material.

[0051] It can be advantageous for the volume of each individual cutting element to deviate from the arithmetic mean of the volumes of all cutting elements of the tool assembly by no more than 20%, preferably no more than 10%, and particularly no more than 5%, preferably no more than 2%. The calculation is based on the arithmetic mean of the volumes of all cutting elements attached to the tool assembly, which represents a stable and representative reference value. The permissible deviation of each individual cutting element from this mean quantifies the term "essentially identical." It takes into account that minimal, unavoidable tolerances always occur in a real manufacturing environment. The widest range of no more than 20% forms a first, broad safety margin. A preferred range of no more than 10% already reflects a well-controlled manufacturing process in which the cutting elements are intentionally manufactured to be identical in construction.The particularly preferred ranges of at most 5% and especially at most 2% represent a high-precision manufacturing process in which the cutting elements, apart from negligible tolerances, can be considered volumetrically identical. This small, tolerance-related deviation contrasts with the prior art, in which significant volume differences are deliberately induced by the targeted, form-grinding of the cutting elements, and these differences are far above these tolerance ranges. By adhering to the claimed small deviation, R. 417337.

[0052] - 11 - ensured that each cutting element retains its full material substance and thus its maximum mechanical stability and wear resistance, which significantly increases the service life and reliability of the entire tooling system. This is ideally achieved through single-tooth manufacturing.

[0053] It may be advantageous for the height of each cutting element, measured perpendicularly from its base surface to be attached to the receiving element to the cutting edge, to deviate from the average height of all cutting elements by no more than 20%, preferably no more than 10%, and in particular no more than 5%, preferably no more than 2%.

[0054] It may be advantageous for the cutting elements, particularly as prefabricated, essentially identical components with constant volume, to be joined. It may be advantageous for the curved shape of the cutting edge to be formed by the different arrangement of the receiving elements. It may be advantageous for the curved shape of the cutting edge not to be created by a shaping, material-removing grinding process on individual cutting elements.

[0055] This advantageously ensures that all cutting elements maintain a substantially constant volume and height. In practice, 'substantially constant' means that the deviation of the volume or a significant height of an individual cutting element from the average of all cutting elements is typically subject only to minor manufacturing tolerances. This deviation is at most 20%, preferably at most 10%, and particularly at most 5%, preferably at most 2%. This is in sharp contrast to the prior art, where targeted re-grinding can lead to intentional volume and height differences of 30%, 50%, or more.

[0056] Another aspect of the invention relates to a method for manufacturing a tooling device, in particular a tooling device, comprising the following steps: R. 417337

[0057] - 12 - a) Providing a support area, in particular with a substantially straight rear edge; b) Forming a plurality of receiving elements on the support area, wherein the receiving elements are arranged such that their receiving surfaces, viewed transversely to an axis of movement, have different distances, in particular to form a sectionally curved receiving edge; c) Providing a plurality of cutting elements, in particular of substantially the same volume; and d) Joining one of the cutting elements, in particular of substantially the same volume, to one of the receiving elements (80), such that the curved shape of the cutting edge is directly determined and formed by the arrangement of the receiving elements defined in step b).

[0058] Preferably without the need for subsequent material removal on the cutting elements themselves to shape the curvature, or other deformations of the tool assembly, particularly the support area. The absence of deformation of the support area can be observed, for example, by a curved trailing edge.

[0059] The receiving element can be made of HCS material. HCS stands for "High Carbon Steel." It is a type of carbon steel with a higher carbon content than conventional carbon steel. The carbon content in HCS is typically between 0.6% and 1.0%. This increased carbon content gives the steel special properties that make it particularly suitable for certain applications.

[0060] The problem is further solved by a tool assembly, in particular for translationally driving the tool assembly along an axis of motion by means of a hand-held power tool, with a holding unit, in particular for holding the tool assembly on a hand-held power tool, with a plurality of cutting elements, in particular forming a cutting edge, in particular for machining a workpiece. R. 417337

[0061] - 13 -

[0062] It may be advantageous to have a cutting area containing or consisting of a cutting area, in particular an HSS material, and a support area that is connected to the cutting area, in particular by a material bond.

[0063] A material-bonded connection is created by joining materials, particularly the cutting area and / or the supporting area, at the molecular or atomic level. This type of connection is characterized by high strength and tightness, as the materials are bonded together by chemical or physical bonds. Specifically, two parts can be joined to form a single part using a material-bonded connection. The connection can be created, for example, by welding, soldering, or gluing.

[0064] It may be advantageous for the tool assembly to have a cutting edge section, in particular a convex one. The cutting edge section can have a radius of at least 20 mm, in particular 40 mm, preferably 60 mm, preferably 70 mm, and / or at most 200 mm, in particular 150 mm, preferably 120 mm, preferably 100 mm.

[0065] The cutting area can extend along a movement axis of the tool assembly. The cutting area can extend from a holding end, in particular the holding unit, to an end opposite the holding end, in particular the plunge tip. The cutting area can extend along the entire cutting edge. The cutting area can extend along the entire holding unit. The cutting area can be designed as a metal band. The cutting area can form the cutting elements. The cutting area can form the cutting teeth, in particular completely. The cutting area can delimit the cutting edges. The cutting area can form the cutting edge. The cutting area can have a variable transverse extent or width when viewed along the movement axis. The transverse extent can be determined at one of R. 417337

[0066] - 14 - exhibit a maximum on the side facing away from the end of the holding unit or the holding unit and / or exhibit a minimum in an area adjacent to the holding unit.

[0067] The cutting edge can be made of HSS. HSS is usually understood to be "high-speed steel." HSS can have a special alloy that provides high hardness, wear resistance, and / or heat resistance. These properties make HSS particularly suitable for tools exposed to high temperatures and loads, such as cutting tools, drills, milling cutters, and jigsaw / reciprocating saw blades. HSS typically contains elements such as tungsten, molybdenum, vanadium, cobalt, and chromium. These elements can contribute to improved hardness, toughness, and heat resistance.

[0068] The support area can extend along a movement axis of the tool assembly. The support area can extend from a holding end, in particular the holding unit, to an end opposite the holding end, in particular the plunge tip. The support area can extend along the entire cutting edge. The support area can extend along the entire holding unit. The support area can be designed as a metal band. The support area can be designed to support the cutting area. The support area can be arranged on the cutting area. The support area can be arranged parallel to the cutting area. The support area can have a connecting edge, in particular extending parallel to the movement axis. The support area can be connected to the cutting area along the connecting edge, in particular by a material bond.The support area can have a rear edge arranged away from the cutting edge, which is preferably intended for support on the hand-held machine tool.

[0069] Another significant advantage resulting from the geometry according to the invention lies in the optimized manufacturing of the tool assembly, which is designed as a bimetallic construction. The separation of the complex cutting edge geometry from a simple, straight support area R. 417337

[0070] - 15 - enables a particularly material- and cost-efficient manufacturing process. Expensive and high-strength cutting material such as HSS is only required for the cutting area along the connecting edge, while the supporting carrier area can consist of a more cost-effective and flexible material such as HCS. Complex process steps such as bending the entire bimetallic composite, as is necessary for saw blades with a continuously curved banana shape, are completely eliminated. The invention thus ideally combines the high cutting performance of an aggressive cutting edge with the stability and significant cost advantages of simpler manufacturing.

[0071] By means of the invention described herein, a multitude of advantages can be achieved, such as efficient production of a tool device, high wear resistance and cutting performance of the cutting area, optimal cutting performance through an adapted cutting angle, stability adapted to the longitudinal extent of the tool device through a width of the cutting area, significant material and weight savings, which leads to cost advantages in production, etc.

[0072] It may be advantageous for the tool assembly to have a connecting edge linking the cutting area to the support area. It is understood that the connecting edge forms a connection contour. It is understood that the connecting edge can typically define a connection surface, the specific nature of which is not further described. It may be advantageous for the connecting edge to extend along, and in particular parallel to, the axis of movement. The connecting edge can be designed as a material-bonded connection edge, in particular a weld edge. The cutting area can be held against the support area along the connecting edge. This allows for a separation of functions, with the support area supporting the cutting area and the cutting area performing the cutting action.

[0073] It may be advantageous for the connecting edge to extend from one end of the tool assembly to an end of the R. 417337 facing away from that end.

[0074] - 16 -

[0075] The tooling extends along the entire tooling assembly. The connecting edge can separate the cutting area from the support area.

[0076] It can be advantageous for the back section to have a back edge arranged parallel to the axis of movement. The back edge can extend parallel to the joining edge. The back edge can be partially parallel to the cutting edge. The back edge can typically be supported by a hand-held power tool, in particular a support device for the power tool, as is commonly the case with jigsaws. In this way, the tool assembly, using the hand-held power tool with the aid of a tool holder and a support device, can enable a lifting movement along the longitudinal axis on the one hand, and support of the tool assembly against the feed direction on the other.

[0077] It may be advantageous for the cutting area to widen along the axis of movement, particularly perpendicular to the axis of movement, as viewed away from the holding unit. It may also be advantageous for the cutting edge to have a distance to the connecting edge that is smaller adjacent to the holding unit than at a distal end of the holding unit. Furthermore, it may be advantageous for the Young's modulus to be greater on the cutting edge segment located further away from the holding unit than on a cutting edge segment located closer to it. This allows the stiffness to be adapted to the distance from the holding unit. Consequently, the Young's modulus can be higher in a region adjacent to the holding unit than at a distal end.It may be advantageous for the support area to remain constant along the axis of movement, viewed away from the holding unit, especially perpendicular to the axis of movement, thereby ensuring optimal and homogeneous support of the cutting area along its entire extent.

[0078] It may be advantageous for the maximum transverse extent of the tool assembly at the cutting edge to be greater than the maximum transverse extent of the holding unit. R. 417337

[0079] - 17 -

[0080] It may be advantageous for the tool assembly to have a further cutting edge section, in particular a concave one. The cutting edge section can have a radius of at least 100 mm, in particular 200 mm, preferably 300 mm, preferably 350 mm, and / or at most 1000 mm, in particular 800 mm, preferably 600 mm, preferably 500 mm.

[0081] It may be advantageous for the tool assembly to have a third cutting edge section, particularly a straight one, which is angled to the joining edge. The third cutting edge section can be arranged to the joining edge or the back edge, particularly at an angle of at least 0.5°, particularly 0.8°, preferably 1°, more preferably 1.2°, more preferably 1.4°, and / or at most 4°, particularly 3°, more preferably 2.5°, more preferably 2°, more preferably 1.8°, more preferably 1.6°.

[0082] It may be advantageous for the further cutting edge section, particularly when viewed along the axis of movement, to be arranged between the cutting edge section and the third cutting edge section.

[0083] It may be advantageous for the tool assembly to have a fourth cutting edge section, in particular a straight section, which is arranged on the cutting edge section and limits the cutting edge.

[0084] The invention further relates to a system comprising a tool device and a hand-held power tool for receiving and driving the tool device.

[0085] Brief description of the drawings

[0086] Further advantages arise from the following drawing description. The drawing may depict further developments of the invention. The drawings, the description, and the claims contain numerous features in combination. The person skilled in the art will expediently consider the features individually and combine them into meaningful further combinations. This is shown in: R. 417337

[0087] - 18 -

[0088] Fig. 1 shows a side view of a hand-held power tool with a

[0089] Tool setup,

[0090] Fig. 2. a side view of a first embodiment of a

[0091] Tool setup,

[0092] Fig. 3 shows a side view of a second embodiment of a

[0093] Tool setup,

[0094] Fig. 4 shows another side view of the second embodiment of a

[0095] Tool setup.

[0096] In the following figures, identical components are labelled with the same reference symbols.

[0097] Fig. 1 shows a hand-held power tool 12 designed as a jigsaw 10 (alternatively as a reciprocating saw) with a machine housing 14 in which a symbolically represented motor 16 is arranged. The motor 16 serves to drive a stroke rod 18 and imparts to it, via an unspecified gearbox 20, a reciprocating motion 22 along a stroke axis 24, which is transmitted to a tool assembly 28 designed as a saw blade 26. The stroke axis 24 coincides with the axis of movement 30 of the tool assembly 28, whereby the axis of movement 30 is defined by the hand-held power tool 12. In the embodiment according to Fig. 4, the axis of movement 30 essentially coincides with the longitudinal axis 32, and in the embodiment according to Figs. 2 to 3, it does not coincide with the longitudinal axis 32, but has an angle α in the range of 1 to 5°, in particular of about 2.5°.The tool assembly 28 has a holding unit 36, designed as a holding end 34, which is detachably mounted on a tool holder unit 38 at the end of the stroke rod. The machine housing 14 is pivotally connected at its underside 42 to a base plate 44, through which the saw blade 26 passes downwards. During the upward stroke 46 or working stroke of the saw blade 26, it engages below the base plate 44 in a cutting action, as indicated by the directional arrow, and cuts forward in the feed direction 48, as indicated by the directional arrow. The stroke rod 18 is mounted in the machine housing 14 for linear displacement by means of upper and lower stroke rod bearings 50 (not specified in detail) and carries a [missing information] at its lower end, designated R. 417337.

[0098] - 19 -

[0099] Saw blade clamping device, designed tool holding unit 38 for receiving the holding unit 36 ​​of the saw blade 26.

[0100] The saw blade 26 is supported on a pendulum roller of a pendulum lever 54, which can impart a back-and-forth pendulum stroke to the saw blade 26 in the feed direction 48.

[0101] For machining a workpiece, the tool assembly 28 has a plurality of cutting elements 58 forming a cutting edge 56. The cutting elements 58 are aligned along a retracting pendulum stroke and thus form a preferred cutting direction. The cutting elements 58 have a cutting geometry 60, each of which forms a cutting tooth by means of a cutting tip 62. The cutting teeth each have a cutting edge 66 with a clearance face 68 and a tapered rake face 70 facing away from the clearance face 68, in order to form a cutting tooth 64 with an acute angle or an angle less than 90°. The clearance faces 68 and the rake faces 70 terminate in the

[0102] Cutting edge 66. The cutting elements 58 each have a convexly curved base surface 72 on a side facing away from the cutting edge 66. This base surface serves as a joining surface and extends along the axis of movement 30 from the clearance surface 68 to the rake surface 70, transitioning tangentially into the clearance surface 68 on one side and the rake surface 70 on the other. The base surface 72 is angled relative to both the clearance surface 68 and the rake surface 70. The base surface 72 is spaced apart from the rake surface 70 along the longitudinal axis.

[0103] The cutting elements 58 are arranged in a series along the axis of movement 30 and are uniformly spaced section by section, and therefore have a uniform cutting pitch or cutting element spacing.

[0104] The cutting elements 58 form a cutting edge 56 along the axis of movement 30 or the longitudinal axis 32, which comes into direct contact with a workpiece during operation of the tool assembly 28 and cuts the workpiece. This cutting edge 56 is preferably made of a [R. 417337]

[0105] - 20 -

[0106] The connecting line of the cutting elements 58, or rather the cutting tooth edges 66 of the cutting elements 58, is formed and designed as a cutting edge front. The cutting edge 56 extends continuously along the longitudinal axis 32. The cutting edge 56 is designed as a kind of trend line in polynomial form along the cutting tooth edges 66 of the cutting elements 58. The cutting edge 56, in turn, is formed from a plurality of successive and adjoining cutting edge segments 76, which are partly straight and partly curved.

[0107] The holding unit 36 ​​is designed to hold the tool assembly 28 on a hand-held power tool 12 and extends along the axis of movement 30. The holding unit 36 ​​has a holding geometry 78 designed as a holding recess with a curved holding surface 38 and a holding contour that delimits the holding surface 38. The holding unit 36 ​​is arranged at and delimits one end 40 of the tool assembly 28 facing the hand-held power tool 12. The holding unit 36 ​​is designed to be fully inserted into or onto the hand-held power tool 12 or the tool holder 38 of the hand-held power tool 12 in both a receiving and an operating state. The holding unit 36 ​​is free of cutting elements 58 and is adapted to the tool holder 38.

[0108] For a material-fit connection of the cutting elements 58, the tool device 28 has a plurality of receiving elements 80, wherein individual receiving elements 80 are spaced at different intervals perpendicular to the longitudinal axis 32. Each receiving element 80 receives a single cutting element 58. The receiving elements 80 are arranged in a series and, viewed along the longitudinal axis 32, are at least sectionally spaced uniformly from one another and have a uniform spacing between them. The receiving elements 80 are made of a material that differs from the material of the cutting elements 58. The receiving elements 80 are arranged discretely along the longitudinal axis 32 and each forms a receiving surface 82 that bounds the receiving elements 80. Each surface normal 84 of the receiving surface R. 417337

[0109] - 21 -

[0110] The receiving surface 82 is directed away from the tool assembly 28. The receiving surface 82 is designed as a concave curved joining surface that is adapted to the base surface 72 of the cutting element 58 or forms a negative mold thereof. The receiving element 80 is joined to the joining surface by means of the base surface 72 of the cutting element 58 by means of a welding and / or brazing process.

[0111] Figures 2b and 2c show enlarged views of two mounting elements 80 of the saw blade 26 from Figure 2a, which are spaced differently apart perpendicular to the longitudinal axis 32. The mounting element 80 (Figure 2b) forms a first distance 86 from the longitudinal axis 32, and the other mounting element 80a (Figure 2c) forms a second distance 88 from the longitudinal axis 32, the first distance 86 being smaller than the second distance 88. The mounting element 80 is arranged closer to the longitudinal axis 32 than the other mounting element 80a.

[0112] To further clarify the core concept of the invention, reference is made to Figures 2a to 2c. The height of a first, exemplary cutting element (58), which is crucial for stability, is designated h1', and the corresponding height of a second cutting element (58), arranged at a different position along the curved cutting edge (56), is designated h2'. According to the invention, h1' is equal to h2'. This essentially identical height results directly from the inventive principle that the cutting elements (58) are joined as prefabricated components of identical volume. The curved shape of the cutting edge (56) is not created by material removal from the cutting elements themselves, but solely by the stepped arrangement of the receiving elements (80). This offset of the individual cutting elements (58) relative to an imaginary, straight reference edge can be visualized as the distance a1' and is the sole reason for the curvature.

[0113] This is fundamentally in contrast to the prior art, which is not shown further here. There, the height of a first cutting element h1 would differ significantly from the height of a second cutting element h2 (i.e., h1 * h2). This significant difference in height and volume inevitably arises in the prior art, since the cutting elements are at a uniform height R. 417337

[0114] - 22 - are mounted and then ground back to different residual heights (h1 , h2) to create the curve.

[0115] The present tool assembly completely avoids this material-weakening process. As a result, all cutting elements (58) retain their optimal, essentially identical height (h1' » h2') and thus their maximum stability, full volume, and uniform bond strength to the carrier. This predefined, stepped arrangement of the mounting elements (80, 80a) in the carrier / receiving element provides the following technical advantage: After joining essentially identical cutting elements 58 onto the respective receiving surfaces 82, the curved profile of the cutting edge 56) is already achieved. In contrast to the prior art, no material-removing grinding of the cutting elements 58 is necessary to shape the cutting edge. Each cutting element retains its full volume and maximum stability, which significantly increases the service life of the entire tool assembly 28.

[0116] The receiving elements 80 project freely perpendicular to the longitudinal axis 32 and are designed to support and hold a cutting element 58 in a free projection. The receiving element 80 thus acts as a support element. Each receiving element 80 has a fixed end 92 and a loose end 94 facing away from the fixed end 92. Each receiving element 80 has a rake face 70a that adjoins the rake face 70 of the cutting element 58. Each receiving element 80 has a clearance face 68a that adjoins or merges into the clearance face 68 of the cutting element 58 and is arranged along the longitudinal axis 32 on a side facing away from the rake face 70. Each surface normal of the rake face 70a points towards the holding unit 36, and each surface normal of the clearance face 68a points away from the holding unit 36.

[0117] To separate the receiving elements 80 from one another, the tool assembly 28 has a recess 100 designed as a trough, which is arranged between each adjacent receiving element 80 and forms a chip recess for receiving chips. The recess 100 is R. 417337

[0118] - 23 - formed from the free surface 68 of a previous receiving element 80 and a rake surface 70 of a subsequent receiving element 80.

[0119] The receiving elements 80 are arranged along a receiving edge 102 with a concavely curved receiving edge section 104a. This curved section can be concave, convex, wavy (S-shaped), or a combination of these shapes, depending on the application, to form a cutting edge 56 adapted to the workpiece. The crucial advantage that the cutting elements 58 can have a substantially constant height is retained in all these geometries. The receiving edge 102 extends approximately from the holding unit 36 ​​to an end 40 facing away from the holding unit 36, or to the (plunge) tip of the tool assembly 28. The receiving edge 102 is spaced approximately one height of the cutting element 58 away from the cutting edge 56.The receiving edge 102 defines an arrangement of the cutting elements 58 on the tool device 28. The receiving edge 102 has several receiving edge sections 104. The receiving edge sections 104 are formed from a plurality of receiving elements 80 along a receiving envelope and extend tangentially to the receiving elements 80 along a trend line. For identically or nearly identically designed cutting elements 58, the receiving edge section 104 defines the cutting edge section 76 associated with the receiving edge section 104. The fact that the cutting elements (58) can retain their essentially identical geometry and original volume avoids the mechanical weakening of individual teeth by deep grinding.

[0120] The receiving edge 102 of the concavely curved receiving edge section 104 has a radius of at least 1200 mm and at most 1600 mm, for example approximately 1445 mm. The receiving edge 102 of the concavely curved receiving edge section 104a has an extent along the longitudinal axis 32 of at least 50 mm and at most 80 mm, for example 68 mm. R. 417337

[0121] - 24 -

[0122] The receiving elements 80 are arranged along a receiving edge 102 with a straight receiving edge section 104b, wherein the straight receiving edge section 104b is arranged between the holding unit 36 ​​and the concavely curved receiving edge section 104. The receiving edge section 104b has an extent along the longitudinal axis 32 of at least 5 mm and at most 15 mm, such as 12 mm.

[0123] The receiving elements 80 are arranged along a receiving edge 102 with a further straight receiving edge section 104c, wherein the curved receiving edge section 104a is arranged between the two straight receiving edge sections 104b, 104c. The receiving edge section 104b has an extension along the longitudinal axis 32 of at least 40 mm and at most 60 mm, such as 50 mm.

[0124] The straight receiving edge sections 104b, 104c adjoin the curved receiving edge section 104a on both sides and define its boundaries. The straight receiving edge sections 104b, 104c are collinear or coplanar to each other.

[0125] The cutting edge 56 is adapted to the receiving edge 102 and runs essentially equidistant from it. The receiving edge 102 forms a cutting edge profile adapted to the cutting edge 56, resulting in the cutting elements 58 being approximately the same size and having an identical geometry. The cutting elements 58 are made of a carbide material. The receiving elements 80 are made of a high-carbon steel (HCS) material. The cutting elements 58 are designed as individual teeth that are connected to the receiving elements 80.

[0126] Figure 4 shows a tool assembly 28 designed as a jigsaw blade, with a cutting area 106 made of HSS material and a support area 108 made of HCS material, which is bonded to the cutting area 106. The jigsaw blade is designed as a bimetallic saw blade. R. 417337

[0127] - 25 -

[0128] The tool device 28 has a convexly curved cutting edge section 76a with a radius of at least 70 mm and at most 100 mm, for example 80 mm.

[0129] The cutting area 106 extends along the longitudinal axis 32 of the tool assembly 28. The cutting area 106 extends from a holding end 34, in particular the holding unit 36, to an end 40 facing away from the holding end 34, in particular the plunge tip. The cutting area 106 extends along the entire cutting edge 56. The cutting area 106 extends along the entire holding unit 36. The cutting area 106 can be designed as a metal strip. The cutting area 106 forms the cutting elements 58. The cutting area 106 forms the cutting teeth 64, in particular completely. The cutting area 106 delimits the cutting edges 56. The cutting area 106 forms the cutting edge 56. The cutting area 106 has a variable transverse extent 110 or width when viewed along the longitudinal axis 32. The transverse extension 110 points at one end 34 from the holding end.a maximum on the side facing away from the holding unit 36 ​​and / or a minimum on an area adjacent to the holding unit 36.

[0130] The cutting area 106 is made of HSS. HSS is commonly understood to mean "high-speed steel." HSS has a special alloy that provides high hardness, wear resistance, and / or heat resistance. These properties make HSS particularly suitable for tooling 28 that is exposed to high temperatures and loads, such as cutting tools, drills, milling cutters, and jigsaw blades (Fig. 4) / reciprocating saw blades (Figs. 2 to 3). HSS typically contains elements such as tungsten, molybdenum, vanadium, cobalt, and chromium. These elements contribute to improved hardness, toughness, and heat resistance.

[0131] The support area 108 extends along the longitudinal axis 32 of the tool assembly 28 from a holding end 34 of the holding unit 36 ​​to an end 40 opposite the holding end 34, or the plunge tip. The support area 108 extends along the entire cutting edge 56 and the R. 417337

[0132] - 26 - entire holding unit 36. The support section 108 is designed as a metal band and is intended to support the cutting section 106. The support section 108 is arranged parallel to the cutting section 106 and is materially bonded to the cutting section 106 by means of a welding process via a connecting edge 112 extending parallel to the longitudinal axis 32. On a side facing away from the cutting edge 56, the support section 108 has a rear edge 114, which is preferably provided for support against a hand-held power tool 12 designed as a jigsaw 10. The rear edge 114 is parallel to the longitudinal axis 32, to the connecting edge 112, and in sections to the cutting edge 56.

[0133] The tool assembly 28 further comprises a cutting edge section 76a, which is particularly convex and is largely responsible for the aggressive cutting behavior and high cutting performance of the tool assembly 28. This convex cutting edge section 76a is located downstream of the concave second cutting edge section 76b, viewed from the holding unit 36 ​​along the extension of the cutting edge 56. The transition from the concave section 76b to the convex section 76a is preferably tangential to ensure a continuous and uninterrupted cutting line without abrupt changes in angle. The transition from the concave section 76b to the convex section 76a is S-shaped. The center point of the radius forming the convex section 76a lies on the side of the back edge 114. The center point of the radius forming the concave section 76b lies on the side of the cutting edge 114.

[0134] According to a preferred embodiment, the convex cutting edge section 76a is designed with a radius of at least 70 mm and at most 100 mm, for example 80 mm. This specific curvature increases the effective cutting angle of the cutting elements 58 in this area, resulting in a particularly aggressive engagement with the workpiece. Functionally, this section is especially advantageous for fast, straight cuts as well as for initiating and executing curved cuts. R. 417337

[0135] - 27 -

[0136] This convex cutting edge section 76a is followed in the direction of the plunge tip 116 by a straight fourth cutting edge section 76d, which limits the cutting edge 56 at its distal end and forms the outermost tip of the tool device 28.

[0137] In the area of ​​the convex cutting edge section 76a, the tool assembly 28 also has its maximum transverse extent 110 or width. This widening of the cutting area 106 gives the saw blade increased rigidity precisely where the greatest cutting forces act. This counteracts lateral deflection or bending of the blade during the aggressive sawing process and ensures precise and stable cutting.

[0138] It may be advantageous for the tool assembly 28 to have a connecting edge 112 that connects the cutting area 106 to the support area 108. It may be advantageous for the connecting edge 112 to extend along, and in particular parallel to, the longitudinal axis 32. The connecting edge 112 can be designed as a material-bonded connecting edge, in particular a weld edge. The cutting area 106 is held against the support area 108 along the connecting edge 112. This achieves a separation of functions, as the support area 108 supports the cutting area 106 and the cutting area 106 performs the cutting action. The connecting edge 112 extends along the longitudinal axis 32 through the entire tool assembly 28.

[0139] The cutting edge 56 has a distance to the connecting edge 112 which is smaller adjacent to the holding unit 36 ​​than at a distal end 116, particularly in the area of ​​the plunge tip, relative to the holding unit 36. The modulus of elasticity differs along the cutting edge 56 and is smaller adjacent to the holding unit 36 ​​than at a distal end 116 of the cutting edge 56 or the cutting edge section 76. A maximum transverse extent 110 of the tool assembly 28 at the cutting edge 56 is greater than a maximum transverse extent 110 of the holding unit 36. R. 417337

[0140] - 28 -

[0141] The tool assembly 28 has a further concave cutting edge section 76b with a radius of at least 300 mm and at most 500 mm, such as 400 mm. The concave cutting edge section 76b has an extent along the longitudinal axis 32 of at least 15 mm and at most 20 mm, such as approximately 17 mm.

[0142] The tool assembly 28 has a straight third cutting edge section 76c, which is angled to the connecting edge 112 at an angle of at least 1° and at most 2°, such as 1.5°. The further cutting edge section 76b is arranged between the cutting edge section 76a and the third cutting edge section 76c when viewed along the axis of movement 30.

[0143] The tool device 28 has a straight fourth cutting edge section 76d, which is arranged on the cutting edge section 76a and limits the extension of the cutting edge 56 at the distal end 116.

Claims

R. 417337 - 29 - Claims 1. Tool device (28), in particular for a translational drive of the tool device (28) along an axis of motion (30) by means of a hand-held power tool (12), with a holding unit (36), in particular for holding the tool device (28) on a hand-held power tool (12), with a plurality of cutting elements (58), in particular forming a cutting edge (56), in particular for machining a workpiece, and with a plurality of receiving elements (80), in particular for a material-fit receiving of the cutting elements (58), characterized in that the, in particular two, receiving elements (80) are spaced apart differently when viewed transversely, in particular perpendicularly, to the axis of motion (30).

2. Tool device (28) according to claim 1 , characterized in that the receiving elements (80) are arranged along the axis of movement (30) and are spaced apart from each other along the axis of movement (30).

3. Tool device (28) according to one of the preceding claims, characterized in that the receiving elements (80) project transversely, in particular perpendicularly, to the axis of movement (30).

4. Tool device (28) according to one of the preceding claims, characterized in that the receiving elements (80) each have a substantially, in particular curved, preferably concave, receiving geometry (78).

5. Tool device (28) according to one of the preceding claims, characterized in that the receiving elements (80) are arranged along a receiving edge (102) with a receiving edge section (104) that is curved, in particular concave.

6. Tool device (28) according to one of the preceding claims, characterized in that the receiving edge (102) of the curved R. 417337 - 30 - The receiving edge section (104) has a radius of at least 500 mm, in particular 800 mm, preferably 1000 mm, preferably 1200 mm, particularly preferably 1400 mm, and / or of at most 3000 mm, in particular 2500 mm, preferably 2000 mm, particularly preferably 1500 mm.

7. Tool device (28) according to one of the preceding claims, characterized in that the receiving elements (80) are arranged along a receiving edge (102) with a straight receiving edge section (104), wherein the straight receiving edge section (104) is arranged between the holding unit (36) and the curved receiving edge section (104).

8. Tool device (28) according to one of the preceding claims, characterized in that the receiving elements (80) are arranged along a receiving edge (102) with a further straight receiving edge section (104), wherein the curved receiving edge section (104) is arranged between the two straight receiving edge sections (104).

9. Tool device (28) according to one of the preceding claims, characterized in that the straight receiving edge sections (104) connect to the curved receiving edge section (104) on both sides and in particular limit it along the axis of movement (30).

10. Tool device (28) according to one of the preceding claims, characterized in that the cutting edge (56) is adapted to the receiving edge (102) and / or runs parallel to the receiving edge (102).

11. Tool device (28) according to one of the preceding claims, characterized in that the receiving elements (80) and the cutting elements (58) contain or consist of different materials, wherein the cutting elements (58) are made of a hard metal material. R. 417337 - 31 - 12. Tool device (28) according to one of the preceding claims, characterized in that the volume of each individual cutting element (58) deviates from the arithmetic mean of the volumes of all cutting elements (58) of the tool device by at most 20%, preferably at most 10%, and in particular at most 5%, preferably at most 2%.

13. Tool device (28) according to one of the preceding claims, characterized in that the height (h) of each cutting element (58), measured perpendicularly from its base surface (72) to be attached to the receiving element (80) to the cutting tooth edge (66), deviates from the average height of all cutting elements (58) by at most 20%, preferably at most 10%, and in particular at most 5%, preferably at most 2%.

14. Tool device (28) according to one of the preceding claims, characterized in that the cutting elements (58) are joined, in particular as prefabricated, substantially identical components with constant volume, wherein the curved shape of the cutting edge (56) is produced by the different arrangement of the receiving elements (80) and in particular not by a shaping, material-removing grinding back of individual cutting elements (58).

15. Method for manufacturing a tool assembly (28), in particular a tool assembly according to any one of claims 1 to 14, comprising the following steps: a) providing a support area (108), in particular with a substantially straight rear edge (114); b) forming a plurality of receiving elements (80) on the support area (108), wherein the receiving elements (80) are arranged such that their receiving surfaces (82), viewed transversely to an axis of movement (30), have different distances, in particular to form a sectionally curved receiving edge (102); c) providing a plurality of cutting elements (58), in particular of substantially the same volume; and d) joining one of the cutting elements, in particular of substantially R. 417337 - 32 - equal-volume cutting elements (58) on each of the receiving elements (80), such that the curved shape of the cutting edge (56) is directly determined and formed by the arrangement of the receiving elements (80) defined in step b), in particular without a subsequent curvature-shaping element Material removal is required on the cutting elements (58) themselves.

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