EP0811443A1 - Tangential rolling head - Google Patents

Abstract

Tangential thread rolling head with two fork-shaped rolling head arms (28, 30), in which thread rollers (32, 36) are rotatably supported by means of parallel axes (38, 40), the thread rollers with a pinion on the axes (38, 40) of one of the two thread rollers (32,36) coupling gear are engaged and threaded rollers and pinions are designed so that the rollers can be inserted laterally before the installation of the axes (38,40), a rolling head holder (18) on which the rolling head arms (28,30) are pivotally mounted about a common axis (60) running parallel to the roller axes (38, 40), threaded means for adjusting the distance between the thread rolling axes (38, 40) from one another and adjusting means for the pivoting position of the roller head relative to the roller head holder (18), interacting Claws (42, 44) of the thread roller (32, 36) and pinion are designed such that the roller (32, 36) can only be inserted laterally in a single defined rotational position. <IMAGE>

Description

The invention relates to a tangential rolling head according to the preamble of claim 1.

Tangential roller heads, in which thread rollers are rotatably mounted on two fork-shaped roller head arms for producing a thread, are generally known. When producing a thread by means of cold forming, the thread rolling head with the non-driven thread rollers is moved from the side onto the rotating workpiece, so that the rotational movement of the workpiece is transmitted to the thread rollers. The pitch of the thread to be produced results from the pitch of the thread the thread rolling. The thread rolls must be in a certain position to each other at the beginning of a thread rolling process and also during thread rolling. Otherwise there is no guarantee that the threads of one thread roller will engage in the threads generated on the workpiece by the other thread roller.

In order to take account of the requirement mentioned, it has become known in the case of tangential rolling heads to provide a synchronous gear between the threaded rollers. It has become known from the company publication "Wagner Seitenrollwerkzeuge" of the Gustav Wagner Maschinenfabrik that a pinion can also be rotatably mounted on the axis on which the thread roller is rotatably mounted. The pinion has on its end face a pair of diametrically opposed claws which engage with complementary claws of the thread roller in order to transmit a rotary movement of the pinion to the thread roller. The thread rolls, which are to be replaceable, are installed from the free side by pushing them in from the side, the claws having to be aligned with one another. In addition, the holes of the thread roller and pinion must be aligned with each other so that the axis can be inserted. This assembly requires some skill and is with one some effort. Since two installable rotational positions are possible for the rotating position of the thread roller, the fitter must ensure that the thread roller is installed in the correct rotational position.

From DE 29 44 499 or G 81 26 219 it has become known that the thread rolls are not coupled via a gearbox, but rather can be rotated freely, but means are provided to return the thread rolls to an initial position after the machining operation. However, the present invention is concerned with a tangential rolling head, the thread rolls of which are coupled via a gear.

The invention has for its object to provide a tangential thread rolling head, in which the installation of the thread rolls is facilitated and the risk of installation in the wrong rotational position is avoided.

This object is solved by the features of claim 1.

In the tangential thread rolling head according to the invention, the interacting claws of the thread roller and pinion designed so that the roller can only be inserted laterally in a single defined rotational position. According to one embodiment of the invention, this is achieved, for example, in that the ends of a pair of opposing claws on the thread roller each lie on the leg of an acute angle, the claws of the pinion being complementary in such a way that the angle formed by them diverges outwards . Such a design of the thread roller and pinion makes it possible, when the pinion is already installed, for the thread roller to be inserted laterally into the arm of the rolling head only in a single rotational position. Any other position would block the insertion.

According to a further embodiment of the invention, the claws are shaped at the ends with an angle so that the axes of the pinion and thread roller coincide when the claws are fully inserted laterally. The conical design of the ends of the claws of the pinion and thread roller not only ensure the rotational position, but also the end position. After the thread roller has been fully inserted, an alignment of the holes of the thread roller and pinion is guaranteed at the same time, so that the axis can be passed straight through without any problems.

The roller head arms are pivotally mounted on the roller head holder about a common axis. In addition, an adjustment mechanism is provided to adjust the distance between the thread rolling axes according to the diameter of the thread to be formed. From the publications mentioned, for example G 81 26 319, it is known to arrange an adjusting screw in the arm of the two-armed lever of the rolling head arm facing the holder, the mutually facing ends of the adjusting screws being located opposite one another. The thread pitch can be changed by turning the two set screws. Once the change has been finally made, and to measure the distance it is known to insert a gauge between the thread rolls, the distance taken is fixed with the help of another locking screw. Such an adjustment mechanism has several disadvantages. One is that operation must be carried out from two different sides. In confined spaces, for example on a turret head of a machine tool, this can lead to difficulties. The storage of the set screws requires space. The length of the tangential roller head is therefore increased by the arrangement of the set screws. There is often little space in CNC turret lathes because the turret head has a relatively small resonant circuit diameter.

Therefore, a further embodiment of the invention provides that a single adjusting screw in one roll head arm interacts with a fixed jaw of the other roll head arm to adjust the distance between the thread rolls. The single screw can be arranged to save space so that the overall length of the thread rolling head can be significantly reduced compared to conventional designs. In this context, a further embodiment of the invention provides that the adjusting screw is arranged approximately at the level of the common axis of the roller head arms, namely obliquely to a central plane which extends between the roller head arms through the common axis of the roller head arms. The jaw connected to the other roller head arm extends beyond the center plane in the direction of the set screw. A particularly short rolling head is obtained in this way.

As mentioned, the precise setting of the center distance of the thread rolls requires a precise measurement. In this context, an embodiment of the invention provides that measuring points, preferably measuring balls, are arranged on the outside of the rolling head arms for determining the center distance of the thread rolls. With conventional tangential roller heads, there is a separate teaching for each thread used. This increases the effort for the operator. By means of the solution according to the invention, a single conventional measuring instrument can be used, for example a micrometer screw or the like, in order to precisely determine the center distance of the thread rolls. A specific setting gauge can be omitted.

When a thread is formed, considerable forces occur which can lead to the deflection of the axis of the thread rolls, which can be associated with breakage of the pinion. It is therefore also provided in known tangential rolling heads to shape the steel axes eccentrically in order to compensate for deflection. An embodiment of the invention provides in this connection that the axes for the thread rolls are formed from hard metal. Tungsten carbide drastically reduces deflection and thus prevents pinion breakage. In addition, the running properties of the thread roll and axle are improved.

If the center distance of the thread rolls is adjusted in the manner described above for the adjustment to a different thread, the thread rolls are positioned differently from the center plane passing through the common axis of the rolling head arms. It is It is therefore necessary to restore the center after the center distance has been set. In this context, an embodiment of the invention provides that at least one roller head arm is designed as a double-armed lever and on the arm assigned to the holder an attachment is provided which interacts with an adjustment mechanism for adjusting the attachment on the holder. To realize the idea, according to a further embodiment of the invention, the approach can cooperate with a nut which sits on a threaded spindle and which is guided in a rotationally fixed manner. The storage of the threaded spindle in the holder leads to a linear adjustment of the nut on the threaded spindle when the threaded spindle rotates and thus to a pivoting of the associated rolling head arm. Since the rolling head arms are, as is known per se, biased against one another by at least one spring, the pivoting of the one rolling head arm leads to the other arm also being pivoted. This allows the rolling head to be aligned with the center plane. According to a further embodiment of the invention, the spindle is preferably accessible from both ends, so that the operator can choose the end that is more favorable in each case in order to achieve the center setting.

Shocks when switching the turret of machine tools can lead to breakage of the attachment or the spindle. In order to counter this danger, it is provided according to a further embodiment of the invention that the spindle is acted upon by a compression spring at opposite ends.

According to a further embodiment of the invention, it is provided that the adjustment mechanism is mounted symmetrically on the holder. As a result, the rolling head can be installed rotated by 180 ° on the holder without the adjustment mechanism having to be converted.

According to a further embodiment of the invention, it is provided that a scale is attached to an arm of the two-armed lever for the roller head arm, which scale interacts with a marking on the common axis. With the help of such a scale, the center distance of the thread rolls can be roughly adjusted.

According to a further embodiment of the invention, a further scale is attached between the holder and a rolling head arm for displaying the center position of the rolling head for the axis spacing of the thread rolls that is set in each case. Every thread size has a certain size on it Scale so that the center can be preset using the scale mentioned.

Fig. 1

zeigt perspektivisch einen Tangentialgewinderollkopf nach der Erfindung.

Fig. 2

zeigt eine Seitenansicht einer Gewinderolle des Rollkopfs nach Fig. 1.

Fig. 3

zeigt einen Schnitt durch die Darstellung nach Fig. 2 entlang der Linie 3-3.

Fig. 4

zeigt die Seitenansicht des Gewinderollkopfs nach Fig. 1 ohne Aufspannkörper.

Fig. 5

zeigt die Draufsicht auf die Darstellung nach Fig. 4 entlang dem Richtungspfeil 5.

Fig. 6

zeigt eine ähnliche Darstellung wie Fig. 4, jedoch bei Weglassung eines Arms des gabelartigen Rollkopfhalters und mit Schnitt durch ein Verstellmittel für die Verschwenkung des Rollkopfs.

Fig. 7

zeigt eine ähnliche Darstellung wie Fig. 6, jedoch in einer anderen Schwenkposition der Rollkopfarme.

The invention is explained in more detail below with reference to drawings.

Fig. 1

shows in perspective a tangential thread rolling head according to the invention.

Fig. 2

shows a side view of a thread roll of the rolling head of FIG. 1st

Fig. 3

shows a section through the representation of FIG. 2 along the line 3-3.

Fig. 4

shows the side view of the thread rolling head of FIG. 1 without clamping body.

Fig. 5

shows the top view of the illustration of FIG. 4 along the direction arrow 5.

Fig. 6

shows a similar representation as FIG. 4, but with the omission of an arm of the fork-like rolling head holder and with a section through an adjusting means for pivoting the rolling head.

Fig. 7

shows a representation similar to Fig. 6, but in a different pivot position of the roller head arms.

In Fig. 1, a clamping body 10 for a thread rolling head 12 is shown, which has an L-shaped section 14, on one web of which a clamping pin 16 is attached to the outside. In the rectangular recess of the L-shaped section 14, a rolling head holder 18 is attached. This consists of a plate-shaped part 20 and two fork arms, only one of which can be seen at 22. The plate-shaped section 20 is attached to the clamping body 10 by means of suitable fastening means sitting on a section of the L-shaped section 14 shown.

The rolling head 12 has two fork-shaped rolling head arms 28, 30 which are designed as two-armed levers and which are rotatably supported by the arms 22 of the holder 18 about a common axis (see further figures in this regard). Threaded rollers 32, 36 are rotatably mounted between the fork arms of the arms 28, 30, specifically on an axis 38 or 40 made of hard metal. As can be seen, the right fork arm in Fig. 1 is wider than the left. This is due to the fact that a gear mechanism is arranged in the wider fork arm, a central gear wheel of the transmission, which couples both thread rollers 32, 36 to one another, is arranged on the common axis. In each case one pinion (not shown) of the transmission sits on the axis 38, 40 and interacts with the thread roller 32, 36 in a rotationally fixed manner.

Fig. 2 shows, for example, the side view of the thread roll 32. It can be seen that two arc-segment-shaped claws 42, 44 are provided on the front side, which are opposite one another on both sides of a continuous bore 46. The arc length of the claws 42, 44 is the same, the claws are displaced relative to one another in the circumferential direction, so that a distance a is formed on one side and a distance b is formed on the other side between the ends of opposite claws 42, 44. The ends are shaped so that they lie on the legs of an angle c. The claws of the pinions, not shown, on the axles 38, 40 are of complementary shape. By pushing the rollers 32, 36 in from the side, they can be installed in the arms 28, 30, with only a single rotational position of the thread rollers 32, 36 allowing installation. A position rotated by 180 ° would result, for example, in that the closer distance a would meet the closer distance of the claws of the pinions. Only with a reverse The claws can be brought into one another in the rotational position of the rollers. In addition, the claws are designed so that the bores 46 of the rollers 32, 36 are aligned with the bores of the built-in pinion when the ends of the interacting claws are properly seated, so that the axes 38, 40 after the insertion of the rollers 32, 36 without more can be inserted. It is no longer necessary to precisely align the rollers.

In Figs. 4 and 5, the tangential rolling head removed from the clamping body 10 can be seen in a side view. The disks 50, 52 support axles 54, 56 of the gear wheels of the transmission, which mesh with the pinions on the axles 38, 40. The disk 58 supports the common axis 60 about which the arms 28, 30 can be pivoted on the holder 18. In addition, there is either a single large gearwheel or an arrangement of three gearwheels, the middle one sitting on the axis 60. In this case, there is an engagement with the gears on the axles 54, 56 so that the rotation of the thread rollers 32, 36 is coupled.

Between the arms 18 of the rolling head arms 28, 30 facing the holder, two springs 62, 64 are tensioned, which bias the corresponding arms towards one another. In Figs. 6 and 7 the corresponding holes 66, 68 with which the springs 62, 64 cooperate can be seen.

In Figs. 6 and 7 it can also be seen that the arms 28, 30 are not constructed identically, rather the roller head arm 28 is relatively short, while the other roller head arm 30 has a jaw portion 70 which extends to the short portion. The jaw portion 70 extends beyond the center plane that extends between the rollers 32, 36 through the common axis 60. Above the common axis 60, an adjusting screw 72 is mounted obliquely to the center plane described in the upper roller head arm 28 in a corresponding threaded bore. By rotating the screw 32, the arms 28, 30 can be pivoted relative to one another about the common axis 60, as from the different positions in FIGS. 6 and 7. As a result, the distance between the rollers, which are only indicated by dash-dotted lines in FIGS. 6 and 7, can be adjusted. A scale 74 is provided on the lower arm 30, which cooperates with a marking 76 on the plate 58 which is firmly connected to the axis 60 and to the arm 28, so that the marking on the scale 74 indicates the distance between the axes of the rollers 32 , 36 have each other. However, this setting is relatively rough.

Fine adjustment is carried out with the aid of measuring balls 78, 80 on the outside of the arms 28, 30, the spacing of which can be measured using a suitable precision measuring instrument.

A spring section 82 is also connected to the jaw section 70 and is inserted into the holding section 20 through a slot 84. The holding section has a bore 86 which supports a threaded spindle 88. The threaded spindle is acted upon on one side at 88 and also on the opposite side at 90 by a compression spring. The threaded spindle 88 has a threaded section 92 on which a nut-like slide 94 is seated, with which the attachment 82 cooperates. The slide 94 is rotatably guided through the slot 84, so that it turns when the spindle 88 is rotated in FIGS. 6 and 7 moved down and up. With the aid of this adjustment mechanism, the lower arm 30 can be pivoted in the desired manner. Since the arms 28, 30 are clamped together via springs, the upper arm 28 is also pivoted at the same time. This makes it possible to achieve a central position of the rolling head after, as shown for example in FIG. 7, the thread rolls 32, 36 have been given a predetermined distance from one another.

The section 20 is covered by a plate 24 on the top, which is fastened with screws 26. Another plate 96 is located on the underside and is attached in the same way. Both plates 24, 96 have an opening 98, 100 for the passage of a tool for rotating the spindle 88.

As can be seen in FIG. 4, the arm 22 of the holder 18 has a scale 102 which interacts with a scale 104 on the disk 58. The disk 58 moves together with the arm 28, so that the center setting of the rolling head can be adjusted with the aid of the scale 102. Each scale line of both scales has a specific center distance between the thread rolls. If this is e.g. 36, then the lines marked 36 on both scales 102, 104 must be aligned with one another so that the center adjustment is present.

It is understood that scales corresponding to scales 74 or 102 and 104 are also provided on the opposite sides of the rolling head.

Claims (16)

Tangential thread rolling head with two fork-shaped rolling head arms, in which thread rollers are rotatably supported by means of parallel axes, the thread rollers laterally engaging with a pinion of a gear unit coupling both thread rollers, and thread rollers and pinions are designed such that the rollers are installed before the Axles can be inserted laterally, a roller head holder on which the roller head arms are pivotally mounted about a common axis running parallel to the roller axes, thread means for adjusting the distance between the thread roller axes from each other and adjusting means for the pivoting position of the roller head to the roller head holder, characterized in that interacting claws (42, 44) of thread roller (32, 36) and pinion are designed so that the roller (32, 36) can only be inserted laterally in a single defined rotational position. Thread rolling head according to claim 1, characterized in that the ends of the claws (42, 44) of a pair of opposing claws on the thread roller (32) each on the leg of an acute angle (c) lie, the claws of the pinion are complementary so that the angle formed by them diverges outwards. Thread rolling head according to claim 2, characterized in that the claws (42, 44) are shaped such that the axes of the pinion and the thread roller (32) coincide when the claws (42, 44) are completely inserted into one another laterally. Thread rolling head, in particular according to one of claims 1 to 3, characterized in that a single adjusting screw (72) in a rolling head arm (28) interacts with a fixed jaw (70) of the other rolling head arm in order to adjust the spacing of the threaded rollers (32, 36) from one another . Thread rolling head according to claim 4, characterized in that the adjusting screw (72) is arranged approximately at the level of the common axis (60) of the rolling head arms (28, 30) obliquely to the one extending between the rolling head arms (28, 30) and the common axis (60) Center plane extends and the fixed jaw (70) extends beyond the center plane in the direction of the associated end of the adjusting screw (72). Thread rolling head, in particular according to one of claims 1 to 5, characterized in that measuring points, preferably measuring balls (78, 80) are arranged on the outside of the rolling head arms (28, 30) for determining the center distance of the thread rolls (32, 36). Thread rolling head according to one of claims 1 to 6, characterized in that the two axes (38, 40) for the thread rolls (32, 36) are formed from hard metal. Thread rolling head, in particular according to one of claims 1 to 7, characterized in that at least one rolling head arm (30) is designed as a double-armed lever and on the arm (70) associated with the holder (18) there is an extension (82) which is provided with a Adjustment mechanism for adjusting the approach on the holder (18) cooperates. Thread rolling head according to claim 8, characterized in that the shoulder cooperates with a nut (94) which sits on a threaded spindle (88) and which is guided in a rotationally fixed manner. Thread rolling head according to claim 9, characterized in that that the spindle (88) is rotatable, but axially fixed in a bore (86) of the holder (18). Thread rolling head according to claim 9 or 10, characterized in that the spindle (88) is acted upon at opposite ends by a compression spring (88, 90). Thread rolling head according to one of claims 9 to 11, characterized in that the spindle (88) is accessible from both ends. Thread rolling head according to one of claims 9 to 12, characterized in that the adjusting mechanism is mounted symmetrically on the holder (18). Thread rolling head according to one of claims 8 to 13, characterized in that the extension (82) is formed by a spring piece which is attached to the associated arm. Thread rolling head according to one of claims 1 to 14, characterized in that a scale is located at one end of the common axis (60) of the rolling head arms (28, 30) (74) is attached to display the center distance of the thread rolls (32, 36). Thread rolling head according to one of claims 1 to 15, characterized in that a scale (102, 104) is attached to the holder (18) and a rolling head arm (30) to indicate the center position of the rolling head for the respectively set center distance of the thread rolls (32, 36).

Images