Method and apparatus for manufacturing toothed rotary components having thickened tooth flanks

Abstract

A method for manufacturing a toothed rotary component (10) having a thickened tooth flank, comprising the steps of: a) manufacturing teeth (3) extending along a plane and uniformly distributed around a blank (1) made of sheet metal material, wherein each tooth (3) has lateral tooth flanks (6) spaced apart from one another by notches (4) distributed around the blank (1); b) deforming at least one tooth flank (6) to manufacture at least one lobe (5), wherein at least one lobe protrudes from the plane of the blank (1), is made of the same material, and protrudes diagonally or vertically upward from the plane of the blank (1); and c) deforming the lobe (5) protruding in the direction of the plane of the blank (1) into a thickened portion (9) of the tooth (3) in the area of ​​the original tooth flank (6).

Description

Technical Field

[0001] The subject matter of the present invention is a method for manufacturing toothed and rotating components having thickened tooth flanks, as defined in the preamble of the independent patent claims, and a component manufactured according to said method.

Background Art

[0002] Toothed rotating components are used in a wide range of applications in mechanical engineering. For example, a gear wheel for a two-wheeler is manufactured using thickened tooth flanks. In this context, it is known to apply thickened tooth flanks on one side of the tooth, but the subsequent teeth do not have such thickening. Such alternately applied thickening, where the thickening is lost in the next tooth, has the purpose, for example, in a bicycle chain drive, of ensuring that the chain centers itself with an extended chain link on the thickened tooth flank while the next, narrower chain link also centers itself with a tooth flank that is not thickened.

[0003] Thus, this method is used to center the chain drive on a sprocket or chain wheel of a two-wheeler. However, the known techniques do not increase the load-bearing capacity of toothed and rotating components.

[0004] European Patent No. 1721821 B1 describes a sprocket wheel of a two-wheeler in which the teeth of the sprocket wheel are reinforced and doubled with additional elements, but it is not accompanied by any material-specific deformation. Thus, it is a reinforcement of the tooth flanks of the sprocket wheel teeth with additional parts without any metal deformation. This means that the load transmission through such a multi-part sprocket with composite teeth is not satisfactory.

Summary of the Invention

Problems to be Solved by the Invention

[0005] Therefore, the basic object of the present invention is to propose a method for manufacturing a toothed rotary component in which the load-bearing portion of the tooth flank is significantly increased, and a device for manufacturing such a component, characterized by the advantage of high load transmission. [Means for solving the problem]

[0006] To achieve the presented objectives, the present invention is characterized by a method according to the configuration of the technical teachings of claims 1 and 9, although advantageous embodiments and further developments of the present invention can be drawn from the dependent claims.

[0007] Therefore, preferred components manufactured according to this method are also the subject of the present invention.

[0008] The advantages of the present invention are that material-specific deformation occurs preferably in the tooth flank (tooth side) of the blank, which is in the form of a sheet metal blank, and that this deformation process occurs in a cold extrusion process, which has the advantage that the cold extrusion process achieves a material structure that undergoes crystalline deformation, and as a result, the strength is increased in the region of the tooth flank being processed.

[0009] Therefore, this method consists of the following steps. 1) A step of preparing a blank made of sheet metal material, which includes mounting teeth uniformly distributed around the perimeter, spaced apart from each other by conical or circular disc-shaped notches. 2) A step of deforming the blank prepared according to step 1 of method, such that the tooth flank of the blank from step 1 protrudes upward or downward at an angle to the plane of the blank, either obliquely or perpendicularly, upward or downward. 3) In the third method step, in order to achieve a thickened portion greater than the initial sheet thickness, the tooth flank is positioned above the initial sheet thickness and the tooth flank is deformed backward, projecting upward or downward at an angle or vertically, so as to form the posterior part of the tooth flank. 4) The final method step then provides that the geometric shape of the tooth is recut using a suitable tool, preferably designed as a stamping tool.

[0010] In a preferred embodiment, it is provided that the rear portion of the tooth flank is thickened by approximately 10-40% of the initial sheet thickness, with an initial sheet thickness in the range of approximately 1-10 mm.

[0011] This technical instruction achieves a remarkable advantage in that the load-bearing capacity of such a rotating component, preferably designed as a gear wheel, is significantly increased, as the thickening of the tooth flank can be carried out as needed on either one or both sides of the tooth flank.

[0012] By deforming the initially upwardly bent tooth flank lobes back into the plane of the blank itself, the folded lobes reinforce the tooth flank and are bonded to the original material of the blank in a subsequent continuous stamping process using a cold extrusion process. This achieves the advantage of superior material properties in the thickened tooth flank region.

[0013] The advantage of this method is that the thickening occurs only in the tooth flank region itself, i.e., the region between the tooth crown and the tooth root. Because the thickening occurs only in the tooth flank region, the following advantages are obtained: Since only the load-transmitting tooth flank is thickened, the load-bearing capacity of the relatively thin rotational component can be significantly increased, while the rest of the blank can be kept narrow and thin, as these other parts essentially do not transmit any load.

[0014] Instead of using a stamping tool for recutting, you can also use other recutting tools, such as milling cutters, drills, or countersinking tools.

[0015] However, in this invention, a pressing tool is preferred for manufacturing the original tooth geometric shape.

[0016] The present invention is not limited to the manufacture of gear wheels. The invention generally relates to the manufacture of toothed rotating components, with a particular focus on gears. These gears are preferably used as bicycle sprockets or pinion gears.

[0017] Such gears are also suitable for driving the camshaft of a combustion engine, or for use in the transmission of an electric or combustion vehicle.

[0018] Such toothed rotating components are also used as multi-disc wheels, which are mounted on a multi-disc clutch in a transmission, thereby allowing the toothed multi-disc wheel having thickened tooth flanks according to the present invention to cooperate with a multi-disc carrier in the transmission.

[0019] In all applications, the present invention may provide thickening of one side of the tooth flank, or thickening of both sides of the tooth flank.

[0020] The forming die, matrix, and component lifter are preferably used for the forming process. The matrix presses and passes the forming die distributed around the perimeter using a press ram, whereby the material on the left and right of the forming die is folded, resulting in a thickening of the material between the matrix and the forming die. The counterholder is spring-loaded for this purpose and has the function of holding the component level and peeling it off the forming stamp again after forming.

[0021] For further processing by embossing, it is preferable to use an embossing punch, die, and hold-down device.

[0022] The hold-down device first presses the component against the die using spring force, and the die stamp rigidly arranged on top now compresses the material downward through a pressing movement. The die stamp is designed in such a way that the barrier ramp prevents the material from flowing towards the center of the die stamp, so thickening now occurs in the opposite direction.

[0023] The next step in the manufacturing process is to cut the complete tooth geometry using a stamping tool, which results in an increased flange thickness compared to the original sheet thickness.

[0024] In a multi-disc clutch, it is preferable to thicken the tooth flanks on both sides in order to significantly increase the load transmission torque in such a multi-disc clutch.

[0025] This has the additional advantage of providing a higher load support capacity for the disc wheel. This is because a narrower disc wheel can be used for the overall load transmission of the multi-disc clutch, and as a result, the resulting gearbox can be made shorter.

[0026] The basic idea behind this process is to partially thicken the tooth flank by means of a multi-stage forming process in order to maximize the contact surface for power transmission with a relatively thin starting material thickness.

[0027] Therefore, it is a method for manufacturing a toothed rotating component having a thickened tooth flank and includes the following steps. a) Manufacturing teeth evenly distributed around the perimeter on a blank extending along a plane made of sheet material, wherein the individual teeth have lateral tooth flanks spaced apart from each other by cutouts distributed around the perimeter of the blank. b) Deforming at least one tooth flank in order to produce at least one lobe of uniform material protruding obliquely or vertically upwards from the plane of the blank. c) Deforming the lobe protruding in the direction of the plane of the blank in order to thicken the tooth in the area of the original tooth flank.

[0028] Preferably, in a further step d), the geometry of the gear is re-cut using a punching tool.

[0029] The deformation according to step b) is carried out using a die that presses the blank onto a complementary forming stamp located on the opposite side of the die, whereby the lobe of the blank is formed in the extrusion process.

[0030] The forming stamp has forming teeth evenly distributed around the perimeter, whereby at least one forming tooth of the forming stamp transforms the material of the tooth flank of the blank at least partially into at least one lobe on the blank, whereby the lobe is pressed laterally in the extrusion process against the forming teeth of the die that engage between the forming teeth of the forming stamp.

[0031] In step c), at least one lobe is formed back into the plane of the blank by die stamping to achieve thickening of the tooth flank.

[0032] Preferably, both lateral tooth flanks are formed for the purpose of thickening the tooth flanks.

[0033] The forming process by at least one of Step c) and Step d) is preferably an extrusion process, and more particularly, a cold extrusion process.

[0034] In summary, the device according to the present invention for manufacturing toothed rotary components having thickened tooth flanks from a blank comprises a forming tool that applies a forming force to at least one tooth flank to displace the blank material at this point to generate at least one lobe protruding from the plane of the blank, and a die stamp that deforms and returns the lobe in the direction of the plane of the blank. The forming tool has at least one die that presses the blank, the die having forming teeth positioned on its outer circumference and a stamp positioned on the opposite side of the die having complementary forming teeth or forming rollers that deform at least one lobe of the blank.

[0035] In a further embodiment, the present invention relates to a method for manufacturing a milling tool as a rotary cutting tool for milling. The tool has at least one, but usually several, cutting edges, most often called cutters. The tool is used in milling machines and machining centers, and the cutters can cut perpendicular or oblique to the axis of rotation.

[0036] Most known milling cutters are made entirely of high-speed steel or carbide, while some have a steel base body and a threaded or clamped indexable insert instead. These can also be made of carbide or much harder cutting ceramic.

[0037] However, the use of indexable inserts can be omitted by a further method of the present invention, which results in the production of a thickened cutting edge. This method includes the following steps: a) A step of manufacturing a blank made of a rigid material extending along a plane, wherein each cutting edge has a lateral cutting flank spaced apart from one another by notches distributed around the blank. b) A step of deforming at least one cutting flank to produce at least one lobe of uniform material protruding from the plane of the blank, which protrudes diagonally or vertically upward from the plane of the blank. c) A step of deforming lobes that protrude in the planar direction of the blank in order to thicken the cutting edge in the area of ​​the original cutting flank.

[0038] Preferably, the thickened region is then ground in the subsequent step d). This grounding allows for the creation of the final cutting geometric shape of the cutting edge distributed around the periphery. For example, the clearance angle and rake angle of the cutting edge can be determined.

[0039] However, the present invention is not limited to polishing, but claims any mechanical surface treatment.

[0040] This method of manufacturing milling tools allows for the optimization of the contact surface for force transmission, even with relatively thin starting material thicknesses.

[0041] The blank is made of, for example, high-speed steel, carbide, or cermet. A sheet material that is hardenable and has a Rockwell hardness of 45 HRC as a starting material is preferred.

[0042] Such milling cutters are used, for example, in woodworking or plastic processing.

[0043] The subject matter of the present invention arises not only from the subject matter of each individual patent claim, but also from the combination of each individual patent claim with respect to each other.

[0044] All information and configurations disclosed herein, including the abstract, and in particular the spatial configurations shown in the drawings, may be claimed as essential to the invention, insofar as they are novel individually or in combination with the prior art. The use of the terms “essential,” “according to the invention,” or “essential to the invention” is subjective and does not mean that such a configuration must necessarily be part of one or more claims.

[0045] The present invention will be described in more detail below with reference to drawings showing only one embodiment. The drawings and their description will reveal further configurations and advantages of the present invention that are essential to the present invention. [Brief explanation of the drawing]

[0046] [Figure 1] a to e show the stepwise processing of a blank during the implementation of the method according to the present invention. [Figure 2] An enlarged perspective view of the geometric shape of the tooth after completion is shown. [Figure 3] A perspective view of the die, along with a forming tool for generating the geometric shape of teeth according to the present invention, is shown. [Figure 4] Figure 3 shows a cross-section through the arrangement. [Figure 5] Figure 1b shows a perspective view of the die and forming stamp during the blank processing step. [Figure 6] An enlarged view of Figure 5 is shown to provide further details. [Figure 7] For better illustration, a schematic diagram of the forming process for a blank, shown as a sheet metal plate, is provided. [Figure 8] Figure 7 shows the process steps involving stamping an upwardly bent sheet metal lobe. [Figure 9]Figure 7 shows the sheet metal lobe bent upward in its undeformed state. [Figure 10] Figure 8 shows the embossed and deformed lobes after the stamping process. [Figure 11] A perspective view of a stamping tool consisting of a hold-down device and an embossing punch positioned within the hold-down device is shown. [Figure 12] A cross-section is shown through the arrangement in Figure 11. [Figure 13] Figures 11 and 12 show perspective views of the stamping process for modified lobes 5 and 5' using a stamping tool. [Figure 14] An enlarged view of Figure 13 with further details is shown. [Figure 15] A perspective view of a stamping punch is shown. [Figure 16] This shows an alternative to the forming tool shown in the preceding diagram in the form of a roller stamp. [Figure 17] A cross-section is shown through the arrangement in Figure 16. [Figure 18] This shows a detailed representation of the application of the roller stamp. [Figure 19] A perspective view of the disc cutter is shown. [Figure 20] Another embodiment of the disc cutter is shown in a plan view. [Modes for carrying out the invention]

[0047] Figure 1 shows a general-purpose blank 1 in the form of a sheet metal blank having a diameter between 50 and 300 mm. Its preferred sheet thickness is in the range of approximately 1 to 10 mm, and in the embodiment shown here, a sheet thickness of 2 mm is used. The blank 1 can rotate about a central axis 2 and has a number of teeth 3 uniformly distributed around its circumference, these teeth 3 being separated from each other by conical notches 4 pointing toward the center of the sheet metal blank.

[0048] According to the present invention, the first step in forming the tooth flank (tooth side) according to Figure 1b is performed by using forming tools 16, 17, and 18 to deform the lateral tooth flank in such a way that the lobe 5 is pushed up from the tooth flank and thus protrudes preferably perpendicularly from the plane of the blank 1, as shown in Figure 1b. The lobe 5 thus pushed out from the plane of the blank 1 is bent over in the next step of the process according to Figure 1c. This is done by a stamping process so that bent lobes 5' (bent-over lobes) are formed from the bent lobes 5', which are pushed back in the direction of the plane of the blank 1 but protrude upward from the plane to form the thickened flank 12 described later. This results in a deformation process in the region of the tooth flank 6 on the blank 1, so that blank 1' in Figure 1b describes the forming process, while blank 1'' in Figure 1c shows the stamping process.

[0049] Finally, in a further method step shown in Figure 1d, a finish cut is performed to obtain the finished blank shown in Figure 1d. Thus, this finish cut ultimately results in a finished toothed component having a thickened tooth flank due to the thickened lobes formed in the thickening process.

[0050] Following the stamping process, the lobes 5' are thickened over each tooth 3 using an extrusion process, while the subsequently folded lobes 5'' are cut to accommodate the desired tooth flank geometric shape of the component. Finally, a finished toothed rotary component with the thickened tooth flanks is obtained, as shown in Figure 1e. Here, the detail circle in Figure 1e shows the details of the reshaped tooth flanks according to Figure 2.

[0051] Figure 2 shows that the notch 4 is present in the sheet metal material 8 of the blank 1, and that the tooth is formed in the regions of the tooth crown 14 and tooth root 15, and has a thickened tooth flank, the thickened tooth flank indicating the thickness 9 (thickening) that occurs between these two parts 14, 15.

[0052] In the illustrated embodiment, the thickness 9 is shown as complete, meaning that the increased thickness 13 is achieved by the increased thickness flank 12 from the initial plate thickness 11 of the toothed component 10.

[0053] The principle of this method can be explained with reference to Figure 2, in which the previously bent-up lobe 5 is folded down in the direction of arrow 35 after the method step shown in Figure 1(b), and as a folded-down lobe, it covers the tooth flank and is formed on the tooth flank in the subsequent stamping process following method step (c) in the extrusion process without any material separation. Thus, this is an on-piece forming process, meaning that a composite with a uniform material is formed as the material of the bent-up lobe 5 is integrally formed on the undeformed tooth flank and bonded to the tooth flank in the cold extrusion process.

[0054] The cold extrusion process induces crystal deformation, which ensures that the bent lobes are bonded to the tooth flanks in a single piece of uniform material during the subsequent stamping process.

[0055] However, the present invention is not limited thereto. In different, less efficient embodiments, only the lobe 5 is bent in the direction of arrow 35, and the subsequent stamping process is carried out with a stamping force such that no cold extrusion of the bent lobe 5 with the tooth flank 6 located below is produced. This means that the lobe 5 is located only above the tooth flank 6 without forming a material-homogeneous bond.

[0056] This less efficient embodiment is also covered by the scope of protection of the present invention.

[0057] Figures 3 to 5 show the morphology of tooth flank 5 formed by bending it upward using the tool shown here.

[0058] The tool is a forming tool, consisting of an inner central die 17, which has numerous notches 19 on its outer circumference, and forming teeth 20 are arranged between them. The number of forming teeth corresponds to the number of teeth 3 in the blank 1.

[0059] The die stamp 18 is positioned at a distance from the inner die 17, surrounding the inner die 17 at a distance, and this die stamp 18 consists of a plurality of shaping teeth 21, with associated interdental gaps 22 positioned between them.

[0060] Therefore, the forming tool 16, as shown in Figures 3 to 5, consists of a die 17 and a die stamp 18 positioned on the outer circumference of the die.

[0061] Figure 4 shows a cross-sectional view of a situation similar to that in Figure 3.

[0062] Figure 5 shows that the lobe 5 can be bent from the tooth flank 6 using two interlocking tools 17 and 18, and thus can protrude vertically upward from the plane of the blank 1, as shown in Figure 5. Thus, the undeformed tooth flank 6, shown by the dashed line, joins with the lobe 5 bent upward using the forming tool 16 shown in Figures 3 and 4.

[0063] For this purpose, a prepared tooth 21 is used, and its structure and function will be described later.

[0064] Figure 6 shows an enlargement of Figure 5, where the formed tooth 21, highlighted in the figure of the die stamp 18, results in an upwardly bent lobe 5, and the undeformed tooth flank 6 is again shown by a dashed line, which is ultimately folded up on one side as shown in Figure 2 by the direction of the arrow 35.

[0065] Figure 6 also shows that there is a counterholder 23 which corresponds to the shape of blank 1 and the forming teeth 20 of die 17, and which has a number of forming teeth 24 on the opposite side of 20.

[0066] It is also shown that the counter holder 23, having a spring 29 from its bottom, forms a spring-loaded counter bearing on the opposite side of the rigid die 17, and that it moves downward with a pressing movement in the direction of arrow 26 and is positioned on the upper part of the tool 28. Thus, the counter holder 23 is positioned on the lower part of the tool 27.

[0067] The notch 25 in the counter holder 23 corresponds to the notch 19 in the die 17. Figure 6 also shows that the tooth flank 6, which was initially undeformed, folds upward during the deformation process shown in Figure 6, thus forming the lobe 5.

[0068] Figures 7 to 10 show an example of the deformation process. In this example, for clarity, the deformation process is not shown with a toothed blank, as in Figure 1, but is shown with a sheet metal blank 30 having the same properties as toothed blank 1.

[0069] Figure 7 shows that the blank 1' corresponding to the processing step in Figure 1d has a notch 31, and the lobe 5 is formed in the blank 1' because it has already been formed upward by the rising forming tooth 21 at the notch 31.

[0070] Figure 8 shows the deformation of lobe 5 back to lobe 5' using a suitable die stamp 32, which has a draft 33 on its stamping surface and moves onto lobe 5 bent upward according to Figure 7, compressing lobe 5 downward in the direction of arrow 34 to fold lobe 5. Now lobe 5' is positioned raised on the surface of the sheet metal blank 30, as shown in Figure 10.

[0071] As described above, this stamping process is carried out as a cold extrusion process, which means that the lobes 5' are joined to the sheet metal plate 30 as a single piece while the lobes 5' are folded and embossed onto the plane of the sheet metal plate 30, as also shown in Figure 10.

[0072] Figures 11-13 show appropriate stamping tools for performing re-stamping according to Figures 8-10. The stamping tool essentially consists of a hold-down device 36 positioned on the outer periphery, in which a number of die stamps 32 are centrally located, corresponding to the geometric shape of the teeth of the toothed component 10.

[0073] Therefore, the stamping tool has a number of die stamps 32, as shown in Figure 13. Each die stamp is suitable for deforming an upwardly bent lobe 5, as shown in Figure 13, into a downwardly bent, i.e., downwardly folded lobe 5', as shown in Figure 13. This produces a blank 1'' as shown in Figure 1c.

[0074] Figure 14 shows an enlarged view of Figure 13 with further details. First, it is shown that the die stamp 32 is rigidly positioned within the upper part 28 of the tool and that the hold-down device 36 is spring-loaded in the direction of arrow 37. This means that the hold-down device 36 must close the gap 43 between the thickened tooth flanks 9, as shown in Figure 2. The die stamp 32 moves downward in the direction of arrow 26 with pressing motion, while the die 17 is rigidly held in the lower tool section 27.

[0075] A special shape of the die stamp 32 to be used, having a cutout 33 and an associated radial surface 40, is illustrated in Figure 15.

[0076] The die stamp 32 moves downward in the direction of arrow 26 and has a laterally angled cutout 33, which causes the protruding material of the lobe 5 to deform back in the direction of arrow 35, thereby forming an angle 42 between the vertical and the plane of the cutout 33.

[0077] The draft angle 33 is bounded at its apex by a compression surface 38 extending perpendicularly thereto, the compression surface 38 ensuring that, as the die stamp 32 is lowered, the lobe 5, which curves downward in the direction of arrow 35, is bonded to the material of the blank 1 during the extrusion process to form a composite with the uniform material. The draft angle 33 is located on one side as a recess 41 within the die stamp 32 and coalesces into an edge region having a suitable radial surface 40. The radial surface forms the transition from the thickened flank 12 to the undeformed sheet material.

[0078] Therefore, the first embodiment shown in Figures 1 to 15 achieves superior tooth geometric shape through thickened tooth flanks, which was previously not possible.

[0079] Examples of embodiments shown in Figures 16 to 18 illustrate further alternatives to the forming method steps described herein, in which a roller deformation tool is used, which essentially consists of a plurality of roller stamps 48 arranged on the outer circumference of the die 17 described above, and the plurality of roller stamps are arranged so that they move into the notches 19 of the die 17 together with their deformation surfaces and associated forming rollers 50 in order to perform the same forming process on the blank 1'. Thus, the same description given for the forming teeth 21 in Figure 6 applies to Figure 18. Figure 18 shows that each forming roller 50 is rotatably supported and has the required forming surface on its outer circumference.

[0080] Therefore, the method according to the present invention achieves excellent load-bearing characteristics for rotating toothed components.

[0081] Figure 19 shows that the notch 54 is now located within the blank sheet metal material 58 and that the tooth 53 indicates the thickened region 59.

[0082] In the illustrated embodiment, the thickening 59 is shown as complete, meaning that the thickening thickness 57 is achieved at the thickened cutting edge 56 from the initial sheet thickness of the disc cutter 60.

[0083] Therefore, this is a method for forming an integral part, which means that the material of the upwardly bent lobe 55 is formed on an undeformed cut edge in the integral part and is bonded to the cut edge in the cold extrusion process, thus forming a composite material having uniform material.

[0084] The cold extrusion process induces crystal deformation, which ensures that the folded lobes are bonded to the cut edges in a single piece of uniform material during the subsequent stamping process.

[0085] However, the present invention is not limited thereto. In different, less efficient embodiments, only the lobe 55 is bent, and the subsequent stamping process is carried out with a stamping force such that no cold extrusion of the bent lobe 55 with the cutting edge 56 located below is produced. This means that the lobe 55 is located only above the cutting edge 56 without forming a composite material with a uniform material.

[0086] In Figure 20, the lower half shows a typical type of blank 51 as a sheet metal blank having any diameter in the range of 50 to 300 mm. Its preferred sheet thickness is in the range of about 1 to 10 mm, thereby a sheet thickness of 2 mm is used in the embodiment shown herein. The blank 51 is rotatable about a central axis 52 and has a number of teeth 53 uniformly arranged around the circumference, as shown in the upper half, which are separated from each other by notches 54 that point toward the center of the sheet metal blank.

[0087] In an embodiment for manufacturing the disc cutter 60, the first method step for forming the cutting edge 56 is performed by using a forming tool to deform the lateral cutting edge 56 in such a way that lobes are pushed up from the cutting edge 56 and thereby protrude from the plane of the blank 51. The lobes pushed out from the plane of the blank 51 are bent in the next step. This is done by a stamping process, so that the lobes bent upward are now formed from bent lobes, which are pushed back toward the plane of the blank 51 but protrude above the plane to form the thickened cutting edge 56 described later. Thus, the deformation process is performed in the region of the cutting edge on the blank 51.

[0088] Finally, in a further method step, mechanical machining, such as grinding, is performed to obtain a finished disc cutter as shown in Figure 20. This machining process ultimately results in a finished disc cutter with a thickened cutting edge because the lobes 55 are thickened during the thickening process.

[0089] After the stamping process, the pre-formed lobes are formed on each tooth 53 by the extrusion process, while the subsequently bent lobes 55 correspond to the geometric shape of the desired cutting edge of the component as a result of grinding.

[0090] This means that the method according to the present invention for thickening the teeth of a toothed component can be applied to gear wheels and disc cutters. In each case, this involves deformation of at least one tooth flank or cutting edge that produces at least one lobe of uniform material that protrudes from the plane of the blank, protruding obliquely or perpendicularly upward from the plane of the blank. In a subsequent method step, the protruding lobe is deformed in the direction of the plane of the blank to thicken the tooth in the area of ​​the original tooth flank.

[0091] The method for manufacturing a disc milling cutter is generally the same as the method for manufacturing toothed components, which are listed, for example, as gear wheels in this description. Therefore, the tools and method steps used for gear wheels, along with the reference symbols shown in the figures, also apply to disc cutters. [Explanation of Symbols]

[0092] 1, 1', 1", 1"' blank 2 center axis 3 teeth 4 Notches 5, 5', 5" lobe (horizontal direction) 6 teeth flank 7. Direction of the arrow 8 Sheet metal materials 9 Thickening 10 components, with teeth 11. Initial sheet metal thickness 12 Franks, thickened 13. Thickness 14 tooth crown 15 Tooth root 16 Shaping Tools 17 Dies 18 die stamps 19 Notch (inside 17) 20 Prepared teeth (from 17) 21. Prepared teeth (from 18) 22 Tooth gap 23 Counter holder 24 Prepared teeth (from 24) 25 Notch (inside 24) 26 Arrow direction 27 Lower tool section 28 Upper Tool Section 29 Spring 30 Metal Sheets 31 Notch (inside 30) 32 die stamps 33. Pull-out margin (32) 34 Arrow direction 35 Arrow direction 36 Hold-down devices 37 Arrow direction (bounced back) 38 Compression surface (from 32) 39 legs (from 32) 40 Radial surface (from 32) 41 radius (within 32) 42 Angle (within 41) 43 Gap 48 Laura Stamp 50 foam rollers (from 48) 51 Blank 52 Center axis 53 teeth 54 Notches 55 robes 56 Cutting Edge 57 Thickness 58 Sheet metal materials 59 Thickening 60 Disc Cutter

Claims

1. A method for manufacturing a toothed rotating component having a thickened tooth flank, a) A step of manufacturing teeth that extend along a plane and are uniformly distributed around the periphery of a blank made of sheet material, wherein each tooth has a lateral tooth flank that is spaced apart from one another by notches distributed around the periphery of the blank, This method is b) The step of deforming at least one tooth flank to produce at least one lobe of uniform material protruding from the plane of the blank, which protrudes diagonally or vertically upward from the plane of the blank, c) The method is characterized by comprising the step of deforming the protruding lobe in the direction of the plane of the blank in order to thicken the tooth in the region of the original tooth flank, method.

2. The method according to claim 1, wherein the deformation according to b) is performed by a die, the die pressing the blank against a complementary die stamp positioned on the opposite side of the die, and the lobes of the blank are formed by extrusion.

3. The method according to claim 1 or 2, wherein the die stamp has forming teeth uniformly distributed around its periphery, and at least one forming tooth of the die stamp deforms at least partially the material of the tooth flank of the blank into the at least one lobe on the blank, and the lobe is pressed laterally in the extrusion process against the forming teeth of the die that engage between the forming teeth of the die.

4. The method according to any one of claims 1 to 3, wherein in step c), in order to achieve thickening of the tooth flank, the die stamp deforms the at least one lobe back to the plane of the blank.

5. The method according to any one of claims 1 to 4, characterized in that, in a further step d), the gear geometric shape is recut using a stamping tool.

6. The method according to any one of claims 1 to 5, characterized in that both lateral tooth flanks of the tooth are formed for the purpose of thickening the tooth flanks.

7. The method according to any one of claims 1 to 6, characterized in that the deformation method by at least one of step c) and step d) is an extrusion method, and more particularly a cold extrusion method.

8. A method for manufacturing a toothed rotary disc cutter having a thickened cutting edge, a) The process includes the step of manufacturing teeth uniformly distributed around the periphery of a blank extending along a plane made of a sheet material, wherein each tooth has a transverse cutting edge that is spaced apart from one another by notches distributed around the periphery of the blank. This method is b) The step of deforming at least one cutting edge in order to produce at least one lobe of uniform material protruding from the plane of the blank, which protrudes diagonally or vertically upward from the plane of the blank, c) The step of deforming the protruding lobe in the direction of the plane of the blank in order to thicken the tooth in the region of the original cutting edge, method.

9. A device for manufacturing toothed rotating components having thickened tooth flanks from a blank, A forming tool is used to produce at least one lobe protruding from the plane of the blank, by applying a deformation force to at least one tooth flank to displace the blank material at that point. A die stamp that deforms the lobe and returns it to the plane direction of the blank, device.

10. The device according to claim 9, wherein the forming tool comprises at least one die for pressing the blank, having forming teeth arranged on the outer circumference, and a stamp arranged on the opposite side of the die, having complementary forming teeth or forming rollers for deforming the at least one lobe of the blank.

11. The device according to claim 9 or 10, characterized in that the die stamp deforms the lobe in the region of the tooth flank during the extrusion process in order to thicken the tooth flank and return it to the plane of the blank.

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