TANGENTIAL THREAD ROLLING HEAD
The invention relates to a tangential thread rolling head comprising two fork-like rolling head arms each rotatably coupled with a thread roll by an axle. The thread rolls respectively engage with a pinion and can be pushed laterally into an assembled position into the rolling head arms before installation of axles, in which one of the axles can be pushed into a bearing bore hole of the thread rolls. The thread rolls and the pinions have interacting catches that are configured such that each of the thread rolls can only be pushed laterally into the assembled position in a single defined rotary position.
This application is based upon and claims priority to, under relevant sections of 35 U.S.C. §119, European Patent Application No. 16 156 538.7, filed Feb. 19, 2016, the entire contents of which are hereby incorporated by reference.
BACKGROUNDThe invention relates to a tangential thread rolling head comprising two fork-like rolling head arms Each thread roll is rotatably mounted on an axle, wherein the thread rolls respectively engage with a pinion positioned on one of the axles of a gear joining the thread rolls. The thread rolls can be pushed laterally into an assembly position into the rolling head arms before installation of the axles, in which respectively one of the axles can be pushed into a bearing bore hole of the thread rolls, wherein the thread rolls and the pinions have interacting catches. The catches of the thread rolls and the pinions are configured such that each of the thread rolls can only be pushed laterally into the assembly position in a single defined rotary position.
Such a tangential thread rolling head is known from the document EP 0 811 443 B1. This type of tangential thread rolling head has the advantage that its proper function is ensured through the suitable configuration of the interacting catches of thread rolls and pinions that each of the thread rolls can only be installed into the rolling head arms in a single defined rotary position. Proper functioning of the tangential thread rolling head is thus ensured. The tangential thread rolling head known from EP 0 811 443 B1 can have in particular rolling head arms that can be pivoted towards each other. On the other hand, tangential thread rolling heads with fixed rolling head arms that cannot be pivoted towards each other are also known. For example, SU 654338 A1 shows such a tangential thread rolling head.
The aforementioned tangential thread rolling head is configured such that each of the thread rolls can only be inserted into the rolling head arm in a single defined rotary position, however each thread roll can be inserted into either rolling head arms, however for the operation of the tangential thread rolling head, it is essential that each thread roll is inserted into the rolling head arm associated with it, otherwise a malfunction could occur. The thread rolls are thus designed differently so that the thread profile designed on its circumferential dimension has an offset dimension required for the processing of workpieces in the installed state. If the thread rolls are interchanged, the correct offset dimension is not present. Thus, damage occurs during the processing of a workpiece. The technician must thus make sure that each thread roll is inserted into the correct rolling head arm. In practice, the thread rolls and the rolling head arms are thus marked in a suitable manner in order to show the association. Overall effort is thus increased and there is risk of faulty assembly.
BRIEF SUMMARY OF THE INVENTIONBased on the explained state of the art, the object of the invention is to provide a tangential thread rolling head of the initially named type, with which faulty assembly of the thread rolls is prevented using a simpler method.
For a tangential thread rolling head of the initially named type, the invention solves the object in that the catches of the thread rolls and the pinions are configured such that each of the catches of the thread rolls can only interact with the catches of a single associated pinion in order to reach the assembly position.
The tangential thread rolling head according to the invention has, in a generally known manner, two rolling head arms, in each of which one thread roll is received. The rolling head arms can be releasably held r on a rolling head holder. However, they can also be configured as one piece with a rolling head holder. The tangential thread rolling head has two thread rolls, which are respectively rotatably mounted on an axle. The rotary axles of the thread rolls run parallel to each other. A pinion is arranged on each axle, for example mounted on each respective axle. In their assembled position, the thread rolls respectively engage laterally with one of the pinions. For this, catches of the thread rolls and catches of the pinions engage in each other. The pinions form part of a gear, in particular a synchronous gear, joining the two thread rolls. The catches of the thread rolls can be pushed laterally into the catches of the respectively associated pinion in order to reach the assembled position. In the assembled position, bearing bore holes of the thread rolls coincide with bearing bore holes of the pinions so that the rotary axles can be pushed into the pinions and the thread rolls.
A suitable design of the catches of thread rolls and pinions ensures that each of the thread rolls can only be pushed laterally into the assembled position in a single defined rotary position, as is generally known from EP 0 811 443 B1. This first ensures that the thread rolls each have the correct rotary position for later proper operation. Faulty assembly with respect to the rotary position is thus excluded.
Moreover, according to the invention, a unique paired association between the thread rolls and pinions is ensured. For this, the catches of the thread rolls and associated pinions for the two pairs of thread rolls and pinions are different. Each thread roll can thereby only reach the assembled position in the case of insertion into the rolling head arm with the “correct,” namely the associated, pinion. In contrast, if an attempt is made to insert the thread roll into the other rolling head arm, the assembled position cannot be reached. In particular, a blockade or respectively an abutting of the catches of the thread roll against the catches of the pinion occurs before the assembled position is reached. The user sees this and can correspondingly insert the thread roll into the other rolling head arm. A faulty assembly through insertion of the thread rolls in the wrong rolling head arm is thus prevented according to the invention. Complex markings of the rolling head arms and thread rolls, which are intended to prevent faulty assembly in the state of the art, can simultaneously be foregone.
According to one embodiment, the catches of the thread rolls and the catches of the pinions respectively associated with the thread rolls can be complementary to each other. The complementary design can be used in all embodiments explained below. Together, the catches of the thread rolls and the catches of the associated pinions can form a complete circle or respectively circular ring.
According to a further embodiment, the thread rolls can each have a pair of opposite-lying catches and/or the pinions can each have a pair of opposite-lying catches.
According to a further embodiment, the distance between at least two opposite-lying ends of the catches of the thread rolls are different for the two thread rolls. Both thread rolls thus have one or more than one catch, wherein respectively at least two catch ends lie opposite each other. The distance between these opposite-lying ends is different on one thread roll than the other thread roll. As already mentioned, this embodiment is possible both in the case of thread rolls that only have one catch as well as in the case of thread rolls that have more than one catch. For example, if the thread rolls each have a pair of catches, the respective distance between all opposite-lying ends of the catches can be different for the two thread rolls.
According to a further embodiment, two opposite-lying ends of the catches of the thread rolls can lie on two imaginary parallel lines. This embodiment is particularly simple to realize in terms of production, for example through milling. The distance between the two imaginary parallel lines can be different for the two thread rolls. The imaginary lines can run in the insertion direction of the thread rolls in the rolling head arm or respectively the pinion. In turn, this embodiment is possible both in the case of thread rolls that only have one catch as well as in the case of thread rolls that have more than one catch.
According to a further embodiment, two ends of the catches of the thread rolls can lie on a common imaginary line. The common imaginary line can run for example perpendicular to the insertion direction of the thread rolls in the rolling head arm or respectively as a pinion. This embodiment is in turn particularly simple to realize in terms of production, for example through milling. The common imaginary lines can in turn be spaced from each other in the assembled position of the two thread rolls. For example, the common lines for the two thread rolls can have a different distance from the middle axle of the thread rolls. Especially when the thread rolls each have a pair of catches, the ends of the catches named in this embodiment can be the two other ends of the catches than the ends named in the aforementioned embodiment, which lie on the two imaginary parallel lines.
According to a further embodiment, at least two opposite-lying ends of the catches of the thread rolls can lie on the sides of an acute angle. The acute angle can be different for the two thread rolls. This embodiment is generally known from EP 0 811 443 B1.
According to a further embodiment, the catches of the thread rolls can respectively form at least one stop surface, wherein the stop surfaces in the assembled position abut against the catches of the associated pinions. For example, in the prior art according to EP 0 811 443 B1, the problem is that the complementary acute angles of the catch ends of thread rolls and pinions cannot be designed to be exactly the same size due to unavoidable production tolerances. As a result, the catches of the pinions are designed slightly smaller than the corresponding acute-angled seat formed by the catches of the thread roll. The thread roll is thereby in turn pushed slightly too far into the pinion when pushed all the way in so that the axles of the thread roll and pinion are not exactly flush. In practice, it is then complicated to push the common rotary axle through the pinion and the thread roll. This problem is overcome in the aforementioned embodiment of the invention in that a stop is formed by a defined stop surface and, when reached, the axles or respectively bearing bore holes of the thread rolls and pinions are exactly flush with each other. The assembly of the common rotary axle is correspondingly simplified.
The stop surfaces can have for example a curved progression, for example a circularly curved progression. The stop surfaces can in that case be adjusted for the outer diameter of the associated pinion. A particularly simple self-centering is achieved in this manner. It would also be possible, for example, that the stop surfaces progress into the assembled position at least in sections diagonal to the insertion direction of the thread rolls.
Furthermore, the stop surfaces can also respectively be formed by a stop section connecting two opposite-lying catch sections of the thread rolls. In this embodiment, it is possible that each thread roll has only one catch. This catch has two opposite-lying catch sections, which are interconnected by the stop section. In contrast, the associated pinion can have two catches.
It can be provided according to a further embodiment that the stop sections each have 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 for a complementarily designed catch of the associated pinion. A pocket-shaped seat is thus formed, delimited laterally by the ends of the opposite-lying catch sections. The floor of the seat is formed by the stop surface of the stop section. A catch of the respectively associated pinion is received in this pocket-shaped seat. According to a further embodiment, the seats of the two thread rolls can have different widths.
In general, all combinations of the aforementioned embodiments according to the invention with each other are possible, which permit the unique association of the thread rolls to the pinions according to the invention.
According to a further embodiment, the tangential thread rolling head can comprise a rolling head holder, on which the rolling head arms are pivotably mounted on a common axle running parallel to the roll axles, as well as adjusting means for adjusting the pivot position of the rolling head arms on the rolling head holder. Thread means for adjusting the distance between the thread roll axles can also be provided.
In another embodiment, the tangential thread rolling head has fixed rolling head arms. The rolling head arm holder and the rolling head arms can then be configured for example as one piece.
Exemplary embodiments of the invention are explained in greater detail below based on figures. They show schematically in:
If not otherwise specified, the same reference numbers indicate the same objects in the figures.
DETAILED DESCRIPTION OF THE INVENTIONThe tangential thread rolling head according to the invention shown in
It can be seen in
The second thread roll 28′ shown in
The first pinion 138 shown in
The second pinion 138′ shown in
The design of the catches 134 and 134′ ensures that the first thread roll 128 can only be brought into the assembled position in an interacting manner with the first pinion 138, and the second thread roll 128′ can only be brought into the assembled position in an interacting manner with the second pinion 138′.
REFERENCE LIST
- 10 Rolling head arm holder
- 12 First rolling head arm
- 12′ First rolling head arm
- 14 Second rolling head arm
- 14′ Second rolling head arm
- 16 First thread roll
- 16′ First thread roll
- 18 Axle
- 18′ Axle
- 20 Second thread roll
- 20′ Second thread roll
- 22 Axle
- 22′ Axle
- 24′ Axle
- 26′ Adjustable spring
- 28 First thread roll
- 28′ Second thread roll
- 30 Hollow-cylindrical projection
- 30′ Hollow-cylindrical projection
- 32 Bearing bore hole
- 32′ Bearing bore hole
- 34 Catch
- 34′ Catch
- 36 Catch
- 36′ Catch
- 38 First pinion
- 38′ Second pinion
- 40 Bearing bore hole
- 40′ Bearing bore hole
- 42 Hollow-cylindrical projection
- 44 Catch
- 44′ Catch
- 46 Catch
- 46′ Catch
- 48 Imaginary line
- 48′ Imaginary line
- 50 Imaginary line
- 50′ Imaginary line
- 52 Imaginary line
- 52′ Imaginary line
- 128 First thread roll
- 128′ Second thread roll
- 130 Hollow-cylindrical projection
- 130′ Hollow-cylindrical projection
- 132 Bearing bore hole
- 132′ Bearing bore hole
- 134 Catch
- 134′ Catch
- 135 First catch section
- 135′ First catch section
- 137 Second catch section
- 137′ Second catch section
- 139 Stop section
- 141 Seat
- 141′ Seat
- 143 Width
- 143′ Width
- 144 Catch
- 144′ Catch
- 145 Acute angle
- 145′ Acute angle
- 146 Catch
- 146′ Catch
- 147 Stop surface
- 147′ Stop surface
Claims
1. A tangential thread rolling head comprising:
- two fork-like rolling head arms;
- two thread rolls, each having a bearing bore hole and one or more catches, each thread roll is rotatably mounted on an axle to the two fork-like rolling head arms, the two thread rolls are configured to be laterally pushed into an assembled position on the two fork-like rolling head arms before installation of each axle, each axle configured to be inserted into the bearing bore hole of one of the two thread rolls; and
- two pinions having one or more catches, wherein each of the two pinions is configured to engage a corresponding thread roll,
- wherein the catches of the thread rolls and the pinions are configured to interact with each other such that each of the thread rolls can only be pushed laterally into the assembled position in a single defined rotary position, and wherein the catches of the thread rolls are configured such that each of the catches of the two pinions can only interact with the catches of the corresponding thread roll.
2. The tangential thread rolling head according to claim 1, wherein the one or more catches of the two pinons are complimentary to the catches of a respective corresponding thread roll.
3. The tangential thread rolling head according to claim 1, wherein the catches on the thread rolls are disposed opposite each other and the catches on the pinions are disposed opposite each other.
4. The tangential thread rolling head according to claim 3, wherein a distance between at least two oppositely disposed catches of one of the two thread rolls is different than at least two oppositely disposed catches of another thread roll.
5. The tangential thread rolling head according to claim 3, wherein oppositely disposed ends of the oppositely disposed catches of the two thread rolls lie on two imaginary parallel lines.
6. The tangential thread rolling head according to claim 5, wherein a distance between the two imaginary parallel lines for each of the two thread rolls is different.
7. The tangential thread rolling head according to claim 3, wherein oppositely disposed ends of the catches of the thread rolls each lie on an imaginary common line.
8. The tangential thread rolling head according to claim 7, wherein the imaginary common lines are spaced from each other when the two thread rolls are in the assembled position.
9. The tangential thread rolling head according to claim 5, wherein at least two oppositely disposed ends of the catches of the two thread rolls lie on sides of an acute angle.
10. The tangential thread rolling head according to claim 9, wherein the acute angle for each of the two thread rolls is different.
11. The tangential thread rolling head according to claim 1, wherein the catches of the two thread rolls each form at least one stop surface configured to abut the catches of a corresponding pinion when in the assembled position.
12. The tangential thread rolling head according to claim 11, wherein the at least one stop surface has a curved progression.
13. The tangential thread rolling head according to claim 11, wherein the at least one stop surface is formed by a stop section connecting two opposite-lying catch sections of one of the two thread rolls.
14. The tangential thread rolling head according to claim 13, wherein the 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 for a complementarily designed catch of the corresponding pinion.
15. The tangential thread rolling head according to claim 14, wherein the seat of each of the two thread rolls have different widths.
16. The tangential thread rolling head according to claim 1, further comprising:
- a rolling head holder configured to pivotably mount the two fork-like rolling head arms on a common axle running parallel to a roll axles; and
- a means for adjusting a pivot position of the rolling head arms on the rolling head holder.
17. The tangential thread rolling head according to claim 16, wherein the means for adjusting a pivot position of the rolling head arms on the rolling head holder comprises a spring.
Type: Application
Filed: Feb 17, 2017
Publication Date: Aug 24, 2017
Inventors: Stefan Janke (Koberg), Raphael Lienau (Hamburg), Adam Beben (Hamburg), Christian Gutsche (Hamburg)
Application Number: 15/436,176