Method and device for producing toothed rotational components with thickened tooth flanks

Abstract

A method for producing a toothed and rotating component (10) with thickened tooth flanks (6, 12), comprising the following steps: a) producing teeth (3) distributed uniformly on the periphery of a blank (1) which extends along one plane and is made from sheet metal material, wherein the individual teeth (3) have lateral tooth flanks (6) which are spaced apart from one another by cut-outs (4) distributed on the periphery of the blank (1); b) deforming at least one tooth flank (6) to produce at least one lobe (5) which projects out of the plane of the blank (1), is made from the same material and projects obliquely or perpendicularly upwards from the plane of the blank (1); c) deforming the projecting lobe (5) in the direction of the plane of the blank (1) to the thickened portion (9) of the teeth (3) in the region of the original tooth flanks (6).

Description

[0001] Method and device for producing toothed rotating components with thickened tooth flanks

[0002] The invention relates to a method for producing toothed and rotating components with thickened tooth flanks and to a component produced by the method according to the preamble of the independent patent claims.

[0003] Toothed rotating components are used in a wide range of applications in mechanical engineering. For example, gears for two-wheeled vehicles are manufactured with thickened tooth flanks. It is common practice to apply a thickened tooth flank to one side of a tooth, while the following tooth does not have such a thickening. Such an alternating thickening with a missing thickening on the next tooth serves the purpose, for example, in a bicycle chain drive to ensure that the chain with an extended chain link is centered on the thickened tooth flank, while the following narrower chain link is also centered on the non-thickened tooth flank.

[0004] This method is used to center chain drives on a pinion or sprocket of a two-wheeled vehicle. However, this known technique does not increase the load-bearing capacity of the toothed and rotating components.

[0005] EP1 721 821 B1 describes a sprocket for a two-wheeled vehicle in which the sprocket teeth are reinforced and doubled with additional elements, but this does not involve any inherent forming of the material. This therefore involves strengthening the tooth flank of the sprocket teeth with add-on parts without any metallic forming. Therefore, the load transfer through such a multi-part sprocket with a composite tooth is unsatisfactory.

[0006] The invention is therefore based on the object of providing a method for

[0007] To propose the production of a toothed rotating component in which the load-bearing portion of the tooth flank is increased to a significant extent and furthermore a device for producing such a component which is characterized by the advantage of high load transmission.

[0008] To achieve the stated object, the invention is characterized by a method according to the features of the technical teaching of claim 1 and claim 9, while advantageous embodiments and further developments of the invention can be found in the subclaims.

[0009] A preferred component produced by the method is therefore also the subject of the invention.

[0010] The advantage of the invention is that a material-specific deformation takes place in the area of ​​the tooth flanks of a blank, which is preferably in the form of a sheet metal blank, and that this deformation process takes place in a cold extrusion process, which is associated with the advantage that a material structure is achieved in the cold extrusion process which undergoes a crystalline deformation and thus results in increased strength in the area of ​​the tooth flank thus machined.

[0011] The present procedure consists of the following procedural steps:

[0012] 1 . Preparation of a blank made of sheet material with the application of teeth evenly distributed around the circumference, separated from each other by conical or circular disc-shaped cutouts.

[0013] 2. Deformation of the prepared blank according to process step 1 in such a way that the tooth flanks of the blank of the first process step are deformed upwards or downwards at an angle to the plane of the blank in such a way that they protrude obliquely or vertically upwards or downwards from the plane of the blank.

[0014] 3. In the third process step, the tooth flanks, which protrude upwards or downwards at an angle or perpendicularly, are reshaped so that they are above the original sheet thickness and form the back of the tooth flank, thus achieving a thickening thickness that exceeds the original sheet thickness. 4. In a final process step, the gear geometry is then recut with a suitable tool, preferably a punching tool.

[0015] In a preferred embodiment, it is provided that, with an initial sheet thickness in the range of approximately 1-10 mm, the tooth flank back is thickened in the range of 10-40% of the initial sheet thickness.

[0016] This technical teaching achieves the essential advantage that the load-bearing capacity of such a rotating component, which is preferably designed as a gear, is significantly increased because the thickening of the tooth flanks can be carried out either on one side of the tooth flank or on both sides of the tooth flank.

[0017] By reshaping the initially raised tooth flank lobes into the plane of the blank itself, the advantage is achieved that the folded lobes reinforce the tooth flank and are joined to the original material of the blank in a subsequent stamping process using the cold extrusion process, so that superior material properties are achieved in the area of ​​the thickened tooth flanks.

[0018] The advantage of this process is that the thickening occurs only in the area of ​​the tooth flanks themselves, i.e., the area between the tooth tip and the tooth root. Since the thickening occurs only in the area of ​​the tooth flanks, the load-bearing capacity of even relatively thin, rotating components can be significantly increased, as only the load-bearing tooth flanks are thickened, while the remaining parts of the blank can be kept narrow and thin, since load transfer through these other parts is essentially non-existent.

[0019] Instead of recutting using a punching tool, other recutting tools can also be used, such as cutting tools such as milling cutters, drills, or countersinking tools. However, in the present invention, a spinning tool is preferred for producing the original tooth geometry.

[0020] The invention is not limited to the production of gears. It generally concerns the production of toothed, rotating components, with a particular focus on gears. These gears are preferably used as chain wheels or pinion gears for bicycles.

[0021] Such gears are also suitable for camshaft drives for combustion engines or for transmissions of electric vehicles or combustion vehicles.

[0022] Such toothed rotating components are also used as multi-disk wheels which are installed in multi-disk clutches of gearboxes, wherein the toothed multi-disk wheel with the tooth flanks thickened according to the invention cooperates with a disk carrier in the gearbox.

[0023] In all applications, it can be provided that the tooth flank is thickened on one side or on both sides according to the method according to the invention.

[0024] Forming tools, such as a die, a forming punch, and a partial lifter, are preferred. The die pushes the component past the forming punches distributed around the periphery using a ram. The material is folded over to the left and right of the forming punches, creating a thickened area between the die and the forming punch. The counterholder is spring-loaded and serves to keep the component flat and to remove it from the forming punches after forming.

[0025] For further processing by embossing, an embossing punch, a die and a hold-down device are preferably used.

[0026] The hold-down device initially presses the component onto the die using spring force. The stamping die, rigidly mounted in the upper part, then compresses the material downwards through the pressing movement. Since the stamping die is designed in such a way that a beveled stop prevents the material from flowing toward the center of the stamping die, a thickening occurs in the opposite direction.

[0027] In the next production step, the complete gear geometry is recut using a punching tool, resulting in an increased flank thickness compared to the original sheet thickness.

[0028] In the case of multi-plate clutches, it is preferred if the tooth flanks are thickened on both sides in order to increase the load transmission torques in such multi-plate clutches by a significant amount.

[0029] This provides the further advantage that a higher load-bearing portion is made available for the multi-plate gear, since overall narrower multi-plate gears can be used in relation to the load transmission of the multi-plate clutch and the resulting gearbox can be built shorter.

[0030] The basic idea of ​​the process is the partial thickening of the tooth flanks by means of a multi-stage forming process in order to maximize the contact surfaces for force transmission with a comparatively thin starting material thickness.

[0031] This therefore concerns a method for producing a toothed and rotating component with thickened tooth flanks, which comprises the following steps: a) producing teeth that are evenly distributed around the circumference on a blank made of sheet material and extending along a plane, wherein the individual teeth have lateral tooth flanks that are spaced from one another by cutouts distributed around the circumference of the blank; b) deformation of at least one tooth flank to produce at least one tab that is made of the same material and projects obliquely or vertically upwards from the plane of the blank; c) deformation of the protruding tab in the direction of the plane of the blank to thicken the teeth in the region of the original tooth flanks.

[0032] Preferably, in a further step d), the gear geometry is recut using a punching tool. The deformation according to step b) is carried out using a die that presses the blank onto a complementary forming punch arranged opposite the die, with the lobes of the blank being formed using the extrusion process.

[0033] The forming punch has forming teeth evenly distributed around the circumference, wherein at least one forming tooth of the forming punch at least partially deforms the material of the tooth flanks of the blank to form the at least one tab on the blank, wherein the tab, in an extrusion process, laterally rests against the forming teeth of the die engaging between the forming teeth of the forming punch.

[0034] In step c), at least one lobe is deformed back to the plane of the blank by means of a stamping die in order to achieve a thickening of the tooth flank.

[0035] Preferably, both lateral tooth flanks of a tooth are reshaped in order to thicken the tooth flank.

[0036] The forming process according to at least one of steps c) and d) is preferably an extrusion process, in particular a cold extrusion process.

[0037] In summary, the device according to the invention for producing a toothed and rotating component with thickened tooth flanks from a blank comprises a forming tool for exerting a forming force on at least one tooth flank to displace the material of the blank at this point to create at least one lobe protruding from the plane of the blank, and a stamping die that deforms the lobe back towards the plane of the blank. The forming tool has at least one die that presses onto the blank and has forming teeth arranged on the outer circumference, as well as a die arranged opposite the die with complementary forming teeth or forming rollers that forms the at least one lobe of the blank. In a further embodiment, this is a method for producing a milling tool as a rotating cutting tool for milling.The tool has at least one, but usually several, cutting edges, which are usually referred to as cutting edges. The tool is used on milling machines and machining centers, and the cutting edges can cut perpendicularly or at an angle to the rotational axis.

[0038] Most common milling cutters are made entirely of high-speed steel or carbide; some have a steel base body and screwed-in or clamped indexable inserts. These can also be made of carbide or the much harder cutting ceramics.

[0039] However, the use of indexable inserts can be dispensed with using a further method of the invention, which provides for the production of thickened cutting edges. This method comprises the following steps: a) production of cutting edges evenly distributed around the circumference on a blank made of a hard material that extends along a plane, wherein the individual cutting edges have lateral cutting flanks that are spaced from one another by cutouts distributed around the circumference of the blank; b) deformation of at least one cutting flank to produce at least one tab that protrudes from the plane of the blank and is made of the same material and protrudes obliquely or vertically upwards from the plane of the blank; c) deformation of the protruding tab in the direction of the plane of the blank to thicken the cutting edge in the region of the original cutting flanks.

[0040] Preferably, the thickened area is then ground in a subsequent step d). This grinding can then create the final cutting geometry of the cutting edges distributed around the circumference. For example, the rake angle and clearance angle of the cutting edges can be determined. However, the invention is not limited to grinding and encompasses any mechanical surface treatment.

[0041] With this process for manufacturing a milling tool, the contact surfaces for force transmission can now be optimized from a comparatively thin starting material thickness.

[0042] The blank is made of high-speed steel, carbide, or cermet, for example. A hardenable sheet material with a Rockwell hardness of 45 HRC is preferred.

[0043] Such a milling cutter is used, for example, in wood or plastic processing.

[0044] The subject matter of the present invention results not only from the subject matter of the individual patent claims, but also from the combination of the individual patent claims with one another.

[0045] All information and features disclosed in the documents, including the abstract, in particular the spatial configuration depicted in the drawings, could be claimed as essential to the invention, insofar as they are novel, individually or in combination, over the prior art. The use of the terms "essential" or "according to the invention" or "essential to the invention" is subjective and does not imply that the features so named must necessarily be part of one or more patent claims.

[0046] The invention is explained in more detail below with reference to drawings illustrating only one embodiment. Further essential features and advantages of the invention will become apparent from the drawings and their description. They show:

[0047] Figure 1 a - 1e: The step-by-step processing of a blank during

[0048] Implementation of the method according to the invention

[0049] Figure 2: An enlarged perspective view of the

[0050] Tooth geometry after completion

[0051] Figure 3: The perspective view of a matrix in conjunction with a mold for producing the tooth geometry according to the invention

[0052] Figure 4: The section through the arrangement according to Figure 3

[0053] Figure 5: A perspective view of the die and

[0054] Forming die during the processing of the blank in the process step according to Figure 1 b

[0055] Figure 6: The enlarged view of Figure 5 showing further details

[0056] Figure 7: The schematic representation of the forming process on a blank, which is shown as a sheet metal blank for better clarity

[0057] Figure 8: The process step according to Figure 7 with the embossing of the highly formed sheet metal tab

[0058] Figure 9: The highly formed sheet metal tab, in the undeformed state according to Figure 7

[0059] Figure 10: The embossed, formed flap after the embossing process according to Figure 8 Figure 11: A embossing tool in perspective view consisting of a hold-down device and an embossing die arranged in the hold-down device

[0060] Figure 12: The section through the arrangement in Figure 11

[0061] Figure 13: The perspective view of the embossing process of the formed tabs 5, 5' with the embossing tool according to Figures 11 and 12

[0062] Figure 14: An enlarged view of Figure 13 showing further details

[0063] Figure 15: The perspective view of an embossing die

[0064] Figure 16: An alternative to the forming tool according to the previous figures in the form of a roller stamp

[0065] Figure 17: Section through the arrangement according to Figure 16

[0066] Figure 18: A detailed view of the application of a roller stamp

[0067] Figure 19: A perspective view of a side milling cutter

[0068] Figure 20: Another embodiment of a side milling cutter in

[0069] Top view

[0070] Figure 1a shows a blank 1 of a general type as a sheet metal blank, which has any diameter in the range of 50-300 mm. Its preferred sheet thickness is approximately in the range of 1-10 mm, whereby in the exemplary embodiment shown here, a sheet thickness of 2 mm is used. The blank 1 is rotatable about the central axis 2 and carries a number of teeth 3 evenly distributed around the circumference, which are separated from one another by conical cutouts 4 pointing towards the center of the sheet metal blank. According to the invention, the first method step of forming the tooth flanks according to Figure 1b takes place by deforming the lateral tooth flanks with the forming tools 16, 17, 18 shown later in such a way that the tabs 5 are pushed up by the tooth flanks and thus protrude from the plane of the blank 1, preferably in a vertical direction, as shown in Figure 1b.The tabs 5 thus pressed out of the plane of the blank 1 are bent over in the next process step according to Figure 1c. This is done by a stamping process, so that the upwardly bent tabs 5 now become the bent tabs 5', which are pressed back towards the plane of the blank 1, but protrude above the plane in a raised manner in order to form the thickened flanks 12 described later. A forming process thus takes place in the region of the tooth flanks 6 on the blank 1, with the blank 1' according to Figure 1b describing the forming process, while the blank 1" according to Figure 1c shows the stamping process.

[0071] Finally, in the next process step according to Figure 1d, a final trimming is carried out, so that a finished blank 1" according to Figure 1d is now available. This final trimming ultimately produces the finished toothed component with thickened tooth flanks due to the tabs 5" formed and thickened in the thickening process.

[0072] After the stamping process, the lobes 5' are thickened and formed onto the respective tooth 3 using the extrusion process, while the later bent lobe 5" is finished by trimming to match the desired tooth flank geometry of the component. Finally, the finished, toothed rotating component with thickened tooth flanks shown in Figure 1 e is obtained. The detailed circle in Figure 1 e now shows the details of the formed tooth flanks according to Figure 2.

[0073] Figure 2 shows that the cutouts 4 are now present in the sheet material 8 of the blank 1, and the teeth are formed in the area of ​​the tooth tip 14 and tooth root 15. Between these two parts 14, 15, the thickened tooth flanks are formed, which show the thickenings 9. In the illustrated embodiment, the thickening 9 is shown in its finished state, which means that from the initial sheet thickness 11 of the toothed component 10, a thickening thickness 13 has now been achieved in the thickened flanks 12.

[0074] The principle of the present method can be explained with reference to Figure 2, in which the previously raised tab 5, after the method step in Figure 1b, has now been folded over in the direction of arrow 35. As a folded-over tab, it now covers the tooth flank and is formed onto the tooth flank in an extrusion process with a subsequent embossing process after the method step according to method step c), without any material separation occurring. This is therefore a one-piece forming process, which means that the material of the raised tab 5 is formed as a single piece onto the undeformed tooth flank and bonded to the tooth flank in the cold extrusion process, so that a uniform composite is formed.

[0075] The cold extrusion process results in a crystalline forming process, which ensures that the bent lobes bond to the tooth flank in a single piece and with a uniform material during the subsequent stamping process.

[0076] However, the invention is not limited to this. In a different and less efficient embodiment, it can be provided that only the tab 5 is bent in the direction of arrow 35, and the subsequent stamping process takes place with such a stamping strength that cold extrusion of the bent tab 5 with the underlying tooth flank 6 does not occur. This means that the tab 5 lies only above the tooth flank 6 without forming a uniform material bond.

[0077] This less efficient embodiment is also intended to be encompassed within the scope of the invention. Figures 3 to 5 show the method of forming the tooth flank 5, which is raised with the tool shown here.

[0078] The tool is a forming tool and consists of an inner central die 17, which has a number of cutouts 19 on its outer circumference, between which the forming teeth 20 are arranged. The number of forming teeth corresponds to the number of teeth 3 in the blank 1.

[0079] At a distance from the inner die 17, a forming punch 18 is arranged, which surrounds the circumference of the inner die 17 at a distance, this forming punch 18 consisting of a plurality of forming teeth 21, between which the associated tooth gaps 22 are arranged.

[0080] The forming tool 16 mentioned here in Figures 3-5 therefore consists of the die 17 and the forming punch 18 arranged on the outer circumference of the die.

[0081] Figure 4 shows the same situation as Figure 3 in section.

[0082] Figure 5 shows that with the two intermeshing tools 17, 18, the lobe 5 can now be bent out of the tooth flank 6 and thus protrude vertically upwards from the plane of the blank 1, as shown in Figure 5. The undeformed tooth flank 6 is therefore shown in dashed lines and merges into the raised lobe 5, using the forming tool 16 according to Figures 3 and 4.

[0083] A form tooth 21 is used, the structure and function of which will be described later.

[0084] Figure 6 shows the enlargement according to Figure 5, wherein it can be seen that a forming tooth 21, highlighted in the drawing from the forming punch 18, produces the raising of the tab 5, wherein the undeformed tooth flank 6 is again shown with dashed lines and this tooth flank is finally folded up on one side, as shown in Figure 2 with the direction of the arrow 35. From Figure 6 it can also be seen that a counter-holder 23 is present which corresponds to the shape of the blank 1 and which has a number of forming teeth 24 which correspond to the forming teeth 20 of the die 17 and are located opposite it.

[0085] It is also shown that the counterholder 23 has a spring 29 from below, thus forming a resilient counterbearing against the rigid die 17, which descends with the pressing movement in the direction of arrow 26 and is arranged in the upper tool part 28. The counterholder 23 is therefore arranged in the lower tool part 27.

[0086] The cutouts 25 in the counterholder 23 correspond to the cutouts 19 in the die 17. Figure 6 also shows that the originally undeformed tooth flanks 6 are now folded upwards during the forming process according to Figure 6, thus forming the lobes 5.

[0087] Figures 7 to 10 show an example of the forming process, whereby in this example, for the sake of better clarity, the forming process is not shown on a toothed blank, as shown, for example, in Figure 1, but on a sheet metal blank 30, which, however, has the same properties as the toothed blank 1.

[0088] In Figure 7 it can be seen that in the blank 1', which corresponds to the process step according to Figure 1d, there is a cutout 31 on which a tab 5 has already been formed upwards on the side by the upwardly moving forming tooth 21, so that the tab 5 has been formed in the blank 1'.

[0089] Figure 8 shows the reshaping of tab 5 into tab 5' using a suitable stamping die 32, which has a chamfer 33 with its stamping surface, which moves onto the raised tab 5 according to Figure 7 and compresses it downward in the direction of arrow 34 in order to bend it. The tab 5' now lies elevated on the surface of the sheet metal blank 30, as shown in Figure 10. This stamping process takes place - as previously shown - as a cold extrusion process, which means that a one-piece material connection of the tab 5 occurs during the folding and the stamping of the tab 5' onto the plane of the sheet metal blank 30, as also shown in Figure 10.

[0090] Figures 11 to 13 show a suitable stamping tool which accomplishes the stamping according to Figures 8 to 10. It essentially consists of a hold-down device 36 arranged on the outer circumference, in which a number of stamping dies 32 are arranged centrally, which correspond to the tooth geometry of the toothed component 10.

[0091] Thus, the stamping tool has a number of stamping dies 32, as shown in Figure 13. Each stamping die is suitable for transforming the raised tab 5, as shown in Figure 13, into a bent-down, i.e., folded-over, tab 5', as shown in Figure 13. This produces the blank 1" shown in Figure 1c.

[0092] Figure 14 shows an enlarged view of Figure 13 with further details. First, it is shown that the die 32 is rigidly arranged in the upper tool part 28, and 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, shown in Figure 2, between the thickened tooth flanks 9. The die 32 moves downward in the direction of arrow 26 with the pressing movement, with the die 17 being rigidly held in the lower tool part 27.

[0093] The special shape of the embossing die 32 used with a bevel 33 and an associated radius surface 40 is explained in Figure 15.

[0094] The stamping die 32 moves downward in the direction of arrow 26 and has a laterally angled draft angle 33, which ensures that the raised material of the tab 5 is deformed back in the direction of arrow 35, whereby an angle 42 is created between the vertical and the plane of the draft angle 33. The draft angle 33 is limited at the top by a compression surface 38 extending perpendicularly thereto, which, when the stamping die 32 moves downward, ensures that the tab 5, which bends downward in the direction of arrow 35, is now firmly connected to the material of the blank 1 in the extrusion process, in order to thus form a uniform material composite. The draft angle 33 is arranged on one side as a recess 41 in the stamping die 32 and merges into the edge area with a suitable radius surface 40. The radius surface forms the transition of the thickened flank 12 into the undeformed sheet material.

[0095] With the first embodiment shown in Figures 1 to 15, a superior tooth geometry is achieved by the thickened tooth flanks, which was not possible before.

[0096] The embodiment according to Figures 16 to 18 shows a further alternative, wherein the forming process step shown here uses a roll forming tool which essentially consists of a plurality of roller punches 48 arranged on the outer circumference of the previously described die 17, which are arranged such that they move with their forming surfaces and the associated forming rollers 50 into the cutouts 19 of the die 17 in order to carry out the same forming process on the blank 1'. The same explanations therefore apply to Figure 18 as were given with regard to the forming tooth 21 in Figure 6. Figure 18 also shows that the respective forming roller 50 is rotatably mounted and has the necessary forming surfaces on the outer circumference.

[0097] The method according to the invention thus achieves superior load-bearing properties for rotating toothed components.

[0098] Figure 19 shows that the cutouts 54 are now present in the sheet material 58 of a blank, and the teeth 53 exhibit the thickened portions 59. In the illustrated embodiment, the thickened portion 59 is shown in its completed state, which means that from the initial sheet thickness of the side milling cutter 60, a thickness 57 has now been achieved at the thickened cutting edges 56.

[0099] This is therefore a one-piece forming process, which means that the material of the raised tab 55 is formed as a single piece onto the undeformed cutting edge and is joined to the cutting edge using a cold extrusion process, so that a uniform material composite is formed.

[0100] The cold extrusion process results in a crystalline forming process, which ensures that the bent tabs bond to the cutting edge in a single piece and with a uniform material during the subsequent stamping process.

[0101] However, the invention is not limited to this. In a different and less efficient embodiment, it can be provided that only the tab 55 is bent, and the subsequent stamping process takes place with such a stamping strength that cold extrusion of the bent tab 55 with the underlying cutting edge 56 does not occur. This means that the tab 55 lies only above the cutting edge 56 without forming a uniform material composite.

[0102] In Figure 20, the lower half shows a blank 51 of a general type, a sheet metal blank, which has any diameter in the range of 50-300 mm. Its preferred sheet thickness is approximately in the range of 1-10 mm, with a sheet thickness of 2 mm being used in the embodiment shown here. The blank 51 is rotatable about the central axis 52 and, as shown in the upper half shown, carries a number of teeth 53 evenly distributed around the circumference. These teeth are separated from one another by cutouts 54 pointing toward the center of the sheet metal blank.

[0103] In the embodiment for producing a side milling cutter 60, the first method step of forming the cutting edges 56 also takes place by using a forming tool to deform the lateral cutting edges 56 in such a way that the tabs are pushed up by the cutting edges 56 and thus protrude from the plane of the blank 51. The tabs thus pushed out of the plane of the blank 51 are bent over in the next method step. This is done by a stamping process, so that the bent over tabs are now created from the bent over tabs, which are pressed back towards the plane of the blank 51, but protrude above the plane in a raised manner in order to form the thickened cutting edges 56 described later. A forming process thus takes place in the region of the cutting edges on the blank 51.

[0104] Finally, in the next process step, mechanical processing, e.g., grinding, is carried out, so that a finished disc milling cutter according to Figure 20 is now available. This processing ultimately produces the finished disc milling cutter with thickened cutting edges due to the tabs 55 formed and thickened in the thickening process.

[0105] After the stamping process, the previously formed lobes are thickened and formed onto the respective tooth 53 using the extrusion process, while the later bent lobe 55 corresponds to the desired cutting flank geometry of the component by grinding.

[0106] Thus, the inventive method for thickening a tooth of a toothed component can be applied to gears as well as to side milling cutters. This always involves deforming at least one tooth flank or cutting edge to produce at least one protruding lobe made of the same material, which protrudes obliquely or vertically upwards from the plane of the blank. In a subsequent process step, the protruding lobe is deformed toward the plane of the blank to thicken the teeth in the region of the original tooth flanks.

[0107] The process for manufacturing a side milling cutter is the same as the process for manufacturing a general toothed component, which is exemplified in the description as a gear. For this reason, the tools and process steps used for the gear, with the reference numerals shown in the figures, also apply to a side milling cutter.

[0108] Drawing guide

[0109] 1 , 1 ', 1“, 1 '“ blank

[0110] 2 center axis

[0111] 3 tooth

[0112] 4 Excerpt

[0113] 5, 5', 5" flaps (side)

[0114] 6 tooth flank

[0115] 7 Arrow direction

[0116] 8 Sheet metal material

[0117] 9 Thickening

[0118] 10 Component, toothed

[0119] 11 Initial sheet thickness

[0120] 12 flanks, thickened

[0121] 13 Thickening strength

[0122] 14 tooth heads

[0123] 15 Tooth base

[0124] 16 mold tool

[0125] 17 die

[0126] 18 form stamps

[0127] 19 Excerpt (in 17)

[0128] 20 form teeth (of 17)

[0129] 21 Form tooth (of 18)

[0130] 22 tooth gap

[0131] 23 Counterholder

[0132] 24 Form tooth (of 24)

[0133] 25 excerpt (in 24)

[0134] 26 Arrow direction

[0135] 27 Tool base

[0136] 28 Upper tool part

[0137] 29 Spring loaded sheet metal blank cutout (in 30) die draft angle (32) arrow direction arrow direction blank holder arrow direction (spring loaded) upsetting surface (of 32) foot (of 32) radius surface (of 32) recess (in 32) angle (in 41) gap

[0138] roller stamp

[0139] Form roll (of 48)

[0140] blank

[0141] center axis

[0142] Tooth

[0143] Excerpt

[0144] rag

[0145] cutting edge

[0146] Thickening strength

[0147] Sheet metal material

[0148] Thickening

[0149] Disc milling cutter

Claims

AMENDED CLAIMS received by the International Bureau on 30 September 2024 (30.09.2024) 1. A method for producing a toothed and rotating component (10) with thickened tooth flanks (6, 12), comprising the following steps: a) producing teeth (3) that are evenly distributed around the circumference on a blank (1) made of sheet material and extending along a plane, wherein the individual teeth (3) have lateral tooth flanks (6) that are spaced from one another by cutouts (4) distributed around the circumference of the blank (1); characterized by the following steps: b) deforming at least one tooth flank (6) to produce at least one tab (5) that is made of the same material and projects obliquely or vertically upwards from the plane of the blank (1); and that this deformation is carried out by means of a die (17) that presses the blank (1) onto a complementary forming punch (18) arranged opposite the die (17), and that the tabs (5) of the blank (1)) are formed by extrusion; c) deformation of the protruding tab (5) in the direction of the plane of the blank (1) to thicken (9) the teeth (3) in the region of the original tooth flanks (6).

2. Method according to claim 1, characterized in that the forming punch (18) has forming teeth (21) evenly distributed around the circumference, that at least one forming tooth (21) of the forming punch (18) at least partially deforms the material of the tooth flanks (6) of the blank (1) to form the at least one tab (5) on the blank (1), wherein the tab (5) lies laterally against the forming teeth (20) of the die (17) engaging between the forming teeth (21) of the forming punch (18) in a flow pressing process.

3. Method according to claim 1 or 2, characterized in that in step c) an embossing die (32) deforms the at least one tab (5) back to the plane of the blank (1) in order to achieve a thickening of the tooth flank (6, 12).

4. Method according to one of claims 1 to 3, characterized in that in a further step d) the tooth geometry is recut with a punching tool.

5. Method according to one of claims 1 to 4, characterized in that both lateral tooth flanks (6) of a tooth (3) are reshaped in order to thicken the tooth flank (6, 12).

6. Method according to one of claims 1 to 5, characterized in that the forming method according to at least one of steps c) and d) is an extrusion method, in particular a cold extrusion method.

7. A method for producing a toothed and rotating disk milling cutter (60) with thickened cutting edges (56), comprising the following steps: a) producing teeth (53) evenly distributed around the circumference on a blank (51) made of sheet material extending along a plane, wherein the individual teeth (53) have lateral cutting edges (56) which are spaced apart from one another by cutouts (54) distributed around the circumference of the blank (51); characterized by the following steps: b) deformation of at least one cutting edge (56) to produce at least one material-uniform tab (55) protruding from the plane of the blank (51) and protruding obliquely or vertically upwards from the plane of the blank (51); c) deformation of the protruding tab (55) in the direction of the plane of the blank (51) to thicken (59) the teeth (53) in the region of the original 30 cutting edge (56);d) Grinding the thickened area to create the final cutting geometry.; 8. Device for producing a toothed and rotating component (10, 60) with thickened tooth flanks (6, 56) from a blank (1, 51), comprising a forming tool (16, 17, 18) for exerting a forming force on at least one tooth flank (6, 56) to displace the material of the blank (1, 51) at this part to produce at least one tab (5, 55) protruding from the plane of the blank (1, 51), and a stamping die (32) which deforms the tab (5, 55) in an extrusion process in the region of the tooth flank (6, 56) back towards the plane of the blank (1, 51) in order to thicken the tooth flank.

9. Device according to claim 8, characterized in that the forming tool has at least one die (17) pressing onto the blank (1, 51) with forming teeth (20) arranged on the outer circumference, and a punch (18, 48) arranged opposite the die (17) with complementary forming teeth (21) or forming rollers (50), which forms the at least one tab (5, 55) of the blank (1, 51).

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