Abstract
The invention relates to a tangential thread rolling head including two rolling head arms having a thread roll rotatably mounted on an axle. The thread rolls are configured to engage with a gear and be pushed laterally into an assembled position into the rolling head arms before the installation of the axles and the axles can be pushed into a bearing bore hole of the thread rolls. The two thread rolls have identical thread profiles that are offset with respect to each other when the thread rolls are in the assembled position.
Claims
1. A tangential thread rolling head comprising: two thread roll arms; two thread rolls having identical circumferentially disposed thread profiles, each thread roll defining a bearing bore hole and configured to be rotatably mounted on an axle, wherein each thread roll engages a gear coupling the thread roll and can be pushed laterally into an assembled position into the rolling head arms before installation of the axle, and wherein one of the axles can be pushed into the bearing bore hole of a thread roll; and a roll engagement means configured to engage a gear engagement means of the gear, the roll engagement means and the gear engagement means configured to only allow the two thread rolls to be installed in a single defined rotary position, wherein the single defined rotary position of the two thread rolls offsets the identical circumferentially disposed thread profiles with respect to each other.
2. The tangential thread rolling head according to claim 1, wherein the roll engagement means are formed by catches of the thread rolls and the gear engagement means are formed by catches of pinions of the gear.
3. The tangential thread rolling head according to claim 2, wherein the catches of the thread rolls and the catches of the pinions are complementary to each other.
4. The tangential thread rolling head according to claim 2, wherein the thread rolls and the pinions are disposed on a common axle.
5. The tangential thread rolling head according to claim 2, wherein the catches of the thread rolls each form at least one stop surface, wherein the at least one stop surface abuts the catches of the pinions in the assembled position.
6. The tangential thread rolling head according to claim 5, wherein the at least one stop surface is formed by a stop section connecting two opposite-lying catch sections of the thread rolls.
7. The tangential thread rolling head according to claim 6, wherein each stop section has a smaller thickness than the opposite-lying catch sections so that a seat delimited by the stop surface is formed between the opposite-lying catch sections and configured to engage a complementarily catch of a corresponding pinion.
8. The tangential thread rolling head according to claim 7, wherein the pinions and corresponding gear wheels of an engaging gear include optical markings configured show a proper installation position of the pinions relative to the gear wheels engaging them.
9. The tangential thread rolling head according to claim 1, wherein the two rolling head arms are not movable relative to each other.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Exemplary embodiments of the invention are explained in more detail in the following using the drawings. They show schematically in:
[0019] FIG. 1 illustrates a perspective view of an embodiment of a tangential thread rolling head,
[0020] FIG. 2 illustrates a perspective view of an embodiment of a tangential thread rolling head,
[0021] FIG. 3 illustrates a schematic representation of the processing of a workpiece in an embodiment of the tangential thread rolling head,
[0022] FIG. 4 illustrates a further schematic representation of the processing of a workpiece in the tangential thread rolling head of FIG. 3,
[0023] FIG. 5 illustrates a perspective view of an embodiment of a gear of the tangential thread rolling head,
[0024] FIG. 6 illustrates a perspective view of an embodiment of a thread roll of a tangential thread rolling head,
[0025] FIG. 7 illustrates a perspective view of the pinion of the gear shown in FIG. 5 interacting with the thread roll from FIG. 6,
[0026] FIG. 8 is a side view of the pinion of the pinion gear shown in FIG. 5 interacting with the thread roll from FIG. 6, and
[0027] FIG. 9 a top plan view of the gear shown in FIG. 5.
[0028] If not otherwise specified, the same reference numbers indicate the same objects in the figures.
DETAILED DESCRIPTION OF THE INVENTION
[0029] The tangential thread rolling head according to the invention shown in FIG. 1 comprises a rolling head holder 10, on which a first fork-like rolling head arm 12 and a second fork-like rolling head arm 14 are designed as one piece and fixed. In the first rolling head arm 12, a first thread roll 16 is rotatably mounted on an axle 18. In the second rolling head arm 14, a second thread roll 20 is rotatably mounted on an axle 22. The axles 18, 22 run parallel to each other. The basic structure and the function of such a tangential thread rolling head are known and are thus not explained in greater detail.
[0030] FIG. 2 shows an alternative form of a tangential thread rolling head according to the invention. This tangential thread rolling head also has two rolling head arms 12′, 14′, in which the first and second thread rolls 16′, 20′ are rotatably mounted on axles 18′, 22′. In turn, the axles 18′, 22′ run parallel to each other. In contrast to the tangential thread rolling head from FIG. 1, the rolling head arms 12′, 14′ in the tangential thread rolling head from FIG. 2 are pivotably mounted on a common axle 24′ running parallel to the roll axles 18′, 22′. Reference number 26′ shows an adjustable spring and thread means are shown (not in greater detail), via which the pivot position of the rolling head arms 12′, 14′ can be adjusted. The design and function of such a tangential thread rolling head with pivotable rolling head arms is also generally known and is thus not explained in greater detail.
[0031] Based on FIGS. 3 and 4, the processing of a cylindrical workpiece shown as reference number 28 shall be explained as an example in the tangential thread rolling head in FIG. 1. FIG. 3 shows the beginning of the thread rolling process. The thread rolls 16, 20 and the workpiece 28 are in this case advanced to each other along the infeed direction shown by the arrows 30, until the position shown in FIG. 4 is reached. Thread rolls 16, 20 and workpiece 28 are subsequently moved apart from each other again. In FIG. 4, the first thread roll 16 engages with the workpiece 28 along the contact location 32 and the second thread roll 20 engages with the workpiece 28 along the contact location 34. The contact locations 32, 34 lie offset by 180° with respect to each other at the processing time shown in FIG. 4. At the start of processing, as shown in FIG. 3, these contact locations are not offset by 180°. The theoretical contact location offset by 180° is shown dashed by reference number 36 in FIG. 3. However, the contact of the second thread roll 20 at the start of processing actually takes place at the contact location 34. For this reason, the thread profiles of the thread rolls 16, 20 must be offset with respect to each other by a defined offset dimension, as initially explained.
[0032] FIG. 5 shows a gear of a tangential thread rolling head according to the invention, which can be used for example in the tangential thread rolling heads shown in FIGS. 1 and 2. The gear has a first pinion 38, which cogs with a first gear wheel 40. A second pinion 42 cogs with a second gear wheel 44. The first gear wheel 40 and the second gear wheel 44 cog with different gear wheel planes of a central coupling gear wheel 46 that are movable relative to each other. The structure and functionality of such a synchronous gear used in tangential thread rolling heads are generally known.
[0033] The uniqueness according to the invention lies in the interaction of the thread rolls with pinions 38, 42. This interaction is explained in greater detail based on FIGS. 6 and 8, here as an example for the thread rolls 16 and 20. This interaction takes place in a corresponding manner for the thread rolls 16′ and 20′. The first thread roll 16 has a hollow-cylindrical projection 48, on which two catches 50, 52 are designed in the shown example. Referring to FIG. 5, the first pinion 38 also has a hollow-cylindrical projection 54, on which two catches 56, 58 are disposed in the shown example. By pushing the first thread roll 16 laterally into the rolling head arm of the tangential thread rolling head, the catches 50, 52 (FIG. 6) of the first thread roll 16 engage with the complementarily designed catches 56, 58 of the first pinion 38, as can be seen in FIG. 7. As shown in FIG. 5, through the complementarily catches 56, 58 or respectively 50, 52 (FIG. 6) the thread roll 16 (FIGS. 6-8) can only engage with the first pinion 38 in a single defined rotary position. In this assembled position of the first thread roll 16, a common rotary axle 60 can be pushed into the bearing bore holes of the first pinion 38 and of the first thread roll 16 defined by the hollow-cylindrical projections 54 or respectively 48, as can be seen in FIG. 8.
[0034] The second pinion 42 of the gear shown in FIG. 5 also has a hollow-cylindrical projection 62, which in turn defines a bearing bore hole for a rotary axle. Two catches 64 and 66 are disposed on the hollow-cylindrical projection 62. The catches 64 and 66 are generally identical to the catches 56 and 58 of the first pinion 38. Moreover, the first and second thread rolls 16, 20 of the tangential thread rolling head shown in FIG. 1 are configured identically, including their thread profiles formed on the circumferential surface. The first and second thread rolls 16′, 20′ of the tangential thread rolling head shown in FIG. 2 are also configured identically, including their thread profiles formed on the circumferential surface. However, the second pinion 42 is arranged twisted by a defined angle with respect to the first pinion 38. If the second thread roll 20 with its catches is now brought in its assembled position engaging with the catches 64, 66 of the second pinion 42 just like the first thread roll 16, the thread rolls 16, 20 are also twisted by this defined angle with respect to each other. The thread profiles designed on the circumferential surface of the thread rolls 16, 20 thus have a defined offset with respect to each other such that the starting points of the thread profiles lie apart from each other by a defined offset dimension.
[0035] Referring to FIG. 9, in order to ensure the correct installation of the pinions 38, 42 in the correct rotary position, a corresponding marking can be provided on the tangential thread rolling head and on the pinions 38, 42, which is to be appropriately noted by the processor during installation of the pinions 38, 42. This is explained in FIG. 9 based on an example. Dot markings 68, 70 are in this case detected on the pinions 38, 42 as well as the gear wheels 42, 44 engaging with them. These markings 68, 70 display the provided installation position of the pinions 38, 42 and gear wheels 42, 44 with respect to each other. Moreover, the gear wheels 42, 44 have second dot markings 72, which can be brought to overlap correspondingly with dot markings 74 of the coupling gear wheel 46 during the installation of the gear. It is ensured in this manner that the pinions and gear wheels of the gear are combined in the correct rotary position and the thread rolls are thus also inserted in the provided rotary position with the required offset dimension.
REFERENCE LIST
[0036] 10 Rolling head holder [0037] 12 First rolling head arm [0038] 12′ First rolling head arm [0039] 14 Second rolling head arm [0040] 14′ Second rolling head arm [0041] 16 First thread roll [0042] 16′ First thread roll [0043] 18 Axle [0044] 18′ Axle [0045] 20 Second thread roll [0046] 20′ Second thread roll [0047] 22 Axle [0048] 22′ Axle [0049] 24′ Axle [0050] 26′ Adjustable spring [0051] 28 Cylindrical workpiece [0052] 30 Arrows [0053] 32 Contact location [0054] 34 Contact location [0055] 36 Theoretical contact location [0056] 38 First pinion [0057] 40 First gear wheel [0058] 42 Second pinion [0059] 44 Second gear wheel [0060] 46 Coupling gear wheel [0061] 48 Hollow-cylindrical projection [0062] 50 Catch [0063] 52 Catch [0064] 54 Hollow-cylindrical projection [0065] 56 Catch [0066] 58 Catch [0067] 60 Rotary axle [0068] 62 Hollow-cylindrical projection [0069] 64 Catch [0070] 66 Catch [0071] 68 Dot marking [0072] 70 Dot marking [0073] 72 Dot marking [0074] 74 Dot marking
