WO2019137683A1

WO2019137683A1 - Method for producing a thread roller and thread roller

Info

Publication number: WO2019137683A1
Application number: PCT/EP2018/082500
Authority: WO
Inventors: Gerhard Weiss; Wolfgang Kutowoi; Ralph Mayrhofer; Siavash Ershadi
Original assignee: Robert Bosch Gmbh
Priority date: 2018-01-10
Filing date: 2018-11-26
Publication date: 2019-07-18
Also published as: DE102018200281A1

Abstract

The invention relates to a method used to produce a thread roller from a tool blank (10), wherein the tool blank (10) has at least one thread profile on the circumferential surface (14) of the tool blank. According to the invention, the circumferential surface (14) is divided into circumferential portions (14-1, 14-2) axially adjacent to each other and directly or indirectly thereafter the thread profile is formed in the circumferential surface (14) of the tool blank (10) by means of grinding, thread profile portions separated from each other being formed, with a thread pitch offset arranged in the region of the division between the thread profile portions.

Description

METHOD FOR PRODUCING A THREADED COLLAR AND THREADED WOOL

description

The invention relates to a method for producing a thread roller from a tool blank, wherein the tool blank is provided on its peripheral surface with we least one thread profile. The invention further relates to a thread roll having at least one thread profile and a thread rolling head, in particular a tangential rolling head, which comprises at least one such Gewinderol le.

State of the art

Thread rolls are cylindrical tooling devices used to manufacture externally threaded components, such as screws.

From DE 103 54 622 B4 a method for producing a thread roll is known, the method comprising the steps of introducing a Ge Winderille in a workpiece by means of a chipping pre-machining, hardening of the pre-machined workpiece and the finishing of the thread groove of the hardened workpiece by grinding a grinding wheel, which follows the course of the thread groove with a feed movement.

When manufactured with conventional thread rolls screws or Schraubkom components, especially in pressurized and / or train standing Druckrohrstut zen with external thread, a screwing of such components is not always long-term stability, so that additional measures against a possible lo ckerung or detachment of bolted components required are with which these are fixed and secured such as the application of an adhesive or the like at a corresponding screwing.

epiphany Advantages of the invention

The method with the characterizing features of claim 1 has the advantage that it is relatively inexpensive to produce a thread roll, with which screws or screw components are manufacturable having axially adjacent thread profile sections with tem thread pitch offset therebetween, whereby when screwing such screw components at the position of the thread pitch offset a self-locking effect occurs, which counteracts a relaxation of such screwed compo nents. For this purpose, it is provided that the peripheral surface is divided into axially adjacent peripheral portions, that directly or indirectly after the thread profile is introduced into the peripheral surface of the tool blank, wherein separate thread profile sections are formed with egg nem in the region of the pitch arranged thread pitch offset. In the thread rolling production advantageously takes place the formation of the thread profile on the peripheral surface in a single ununter rupted step. Preferably, the forming of the thread profile is carried out by means of grinding.

Further advantageous developments and refinements of the invention will become apparent from the measures listed in the dependent claims.

A particularly easy-to-implement embodiment of the method according to the invention can be that, for dividing the peripheral surface, a circumferential gap is formed in the circumferential direction of the tool blank, which separates the peripheral surface into circumferentially spaced peripheral portions, and then the thread profile into which Peripheral sections having circumferential surface is introduced, being determined by the umlau fende gap of the thread pitch offset. Conveniently, the gap can be formed as a circumferential groove. Conveniently, the gap is formed with a width which is unequal to an integer multiple of a selected thread pitch. In this case, the width of the gap may be greater or smaller than an integer multiple of the selected thread pitch. A preferred embodiment of the invention, whereby further modifications of the method are possible, is that the tool blank from we least two bodies is formed, wherein circumferential surfaces of the at least two bodies in the assembled state of the tool blank serve as aneinan axially adjacent peripheral portions for the thread profile sections. In this case, at least one spacer between the at least two Kör bodies are arranged, by which the mutually separated sections are spaced, being determined by the width of the spacer the thread pitch offset.

A suitable variant provides that the spacer is inserted before the Ausbil the thread profile in the tool blank. Alternatively, it can be provided that the spacer is inserted after the formation of the threaded deprofils in the tool blank, including additional operations are required to solve after forming the thread profile, the at least two bodies from each other or separate and then with interim ordneter spacer put together again.

A modified variant of the method, in which the tool blank is formed from at least two bodies may consist in that after Ausbil the thread profile facing each other and in the circumferential direction ver current circumferential edges of the thread profile sections formed to catch sections at least one of the perimeter edges perpendicular to the plant sides is removed to achieve the thread pitch offset by reducing the axial width of the associated peripheral portion.

According to a further modified embodiment of the method according to the invention Shen provided that after forming the thread profile, we least two bodies in the circumferential direction of the tool blank to a vorbe certain angle compared to a set before forming the thread profile starting position against each other rotated and in the ver rotated angular position rotatably determined to each other, whereby a ent speaking thread pitch offset is defined. In device technical terms, a thread roller is provided with at least one formed on its peripheral surface thread profile, wherein the peripheral surface is divided into at least two axially adjacent thread profile sections, wherein a thread pitch offset between facing ends of the threaded portions is formed. Such a thread roller is advantageously suitable for mass production of screws or screw components, each with a trained Gewindesteigungsver rate; Due to the resulting self-locking effect have such threaded rollers made screw components in the region of Ge Ge slope adjustment offset higher Verschraubungssicherheit compared to conventional fittings.

A preferred embodiment of the invention is that the threaded roller has at least two bodies, peripheral surfaces of the at least two bodies serving as axially adjacent thread profile sections. In this case, at least one spacer between the at least two Kör bodies can be arranged, is set by the width of the thread pitch offset Festge. Conveniently, the spacer has an outer diameter which is smaller than the outer diameter of the peripheral surface. This prevents the spacer, e.g. the step for forming the thread profile, preferably during the grinding process, in the Erfas sungsbereich of a grinding wheel used in this case.

Another embodiment of the invention may consist in that a phase jump of the thread profile is formed between mutually facing edges of the thread profile sections. The mutually facing Rän are the thread profile sections in direct contact with each other, whereby the thread profile forming thread groove undergoes a sudden displacement in the transition from one edge to the adjacent edge.

A thread rolling head, in particular a tangential rolling head, comprises at least one such thread roll and is suitable for fully automatic controlled use in a production line.

Brief description of the drawings Embodiments of the invention are explained in more detail in the following description and in the accompanying drawings. The latter show in schematic views:

1 is a perspective view of a tool blank according to a first embodiment, wherein the thread rolling blank is integrally formed and has a hollow cylindrical portion and a smaller diameter extending therefrom neck portion,

2 is a rear view of the tool blank,

3 is a longitudinal sectional view of the tool blank according to the section line l-l of Fig. 2,

4 shows a detailed view of the groove formed on the circumferential surface of the tool blank in a continuous fashion according to detail II on a greatly enlarged scale,

5 is a side view of a thread roll according to the invention, in which two adjacent thread profile channels are formed, which are spaced apart by an offset,

6 is a perspective view of a second embodiment of the inventions to the invention tool blank, which is formed in several pieces,

7 is a rear view of the tool blank of Fig. 5,

8 is a longitudinal sectional view of the tool blank according to the section line Mi lli of Fig. 7,

9 is a longitudinal sectional view of the tool blank according to the section line IV-IV of Fig. 7,

10 is a perspective view of a third embodiment of the inventions to the invention tool blank, which is formed in several pieces, 11 is a rear view of the tool blank of Fig. 10,

Fig. 12 is a longitudinal sectional view of the tool blank according to the section line

V-V of Fig. 11,

13 is a rear view of a fourth embodiment of the inventive tool blank, which is formed in several pieces,

Fig. 14 is a longitudinal sectional view of the tool blank according to the section line

VI-VI of Fig. 13,

Fig. 15 is a sectional detail view VII of FIG. 13 a section of the tool blank according to the section line VIII-VIII of Fig. 14 on a larger scale scale where interlocking contour profiles of the tool blank bil dividend two bodies are formed as toothed contour surfaces, the Centering of the two bodies,

16 shows a detail view VII of FIG. 13 of an alternative embodiment of the section of the tool blank according to the section line

VIII-VIII of FIG. 14 on an enlarged scale, where interlocking Konturpro file of the tool blank forming two bodies are formed as polygonal surfaces, which serve to center the two bodies,

17 is a perspective view of a fifth embodiment of the inventions to the invention tool blank, which is formed in several pieces,

18 is a rear view of the tool blank of Fig. 17,

19 is a longitudinal sectional view of the tool blank according to the section line

IX-IX of Fig. 18,

20 is a perspective view of a sixth embodiment of the inventions to the invention tool blank, which is formed in several pieces, FIG. 21 is a rear view of the tool blank of FIG. 20; FIG.

Fig. 22 is a longitudinal sectional view of the tool blank according to the section line X-X of Fig. 21, and

Fig. 23 is a cross-sectional view through the tool blank of Fig. 22. Embodiments of the invention

In the embodiments explained below, like reference numerals in the figures denote the same or similar features.

FIGS. 1 to 4 show, in various views, a tool blank or thread rolling blank according to the invention, denoted as a whole by 10, according to a first embodiment, which is formed in one piece. The rotationally symmetrical with respect to a longitudinal central axis or axis of symmetry 10 ^' out formed tool blank 10 has a hollow cylindrical portion 11 and a coaxial therefor forterstreckenden smaller diameter neck portion 12. The hollow cylindrical neck portion 12 is provided for receiving in a rolling head arm Tangentialgewinderollkopfs (not shown) and has at its free end two circumferentially spaced claws 18 which are provided for coupling to an unillustrated transmission of a rolling head. Coaxial with the longitudinal central axis 10 ^' extends through both sections 11, 12, a through hole 13, which serves as a bearing bore. The larger diameter portion 11 has an outer peripheral surface 14, which is provided for formation as a threaded profile section and in the middle of which a circumferential groove 15 is formed. As shown in Fig. 4 in a detailed view and greatly enlarged scale, the groove 15 in the Außenumfangsflä surface 14 has an approximately V-shaped profile. To form a thread on the outer peripheral surface 14 of the threaded roller blank 10 is by means of a grinding wheel (not shown), which may be formed as Einprofilscheibe or multi-profile disc, a threaded profile in the peripheral surface 14 of the blank 10 is introduced or ground by the thread rolling Blank 10 in rotation about its axis of symmetry 10 ^' and the grinding wheel in an axial feed movement over the peripheral surface 14 of its one Edge 14 ^' to the opposite edge 14 ^" is performed. If the grinding wheel reaches the axial position of the groove 15 and passes over it, the formation of the thread profile or thread groove is interrupted at this position and an offset of the thread forms there, whereby the thread profile on the peripheral surface 14 in two axially spaced apart threaded portions 14-1, 14-2 is divided, which are arranged on both sides of the groove 15.

Fig. 5 shows in a highly schematic view of an inventive threaded roller 100 according to the invention from egg nem tool blank or thread rolling blank 10 according to FIG. 1 to 4 Herge provides is by means of a profile disc a thread in the by the groove 15 spaced outer lateral surfaces or peripheral surfaces 14-1, 14-2 is introduced or ground. On both sides of the groove 25, the thread profilabschnitte an equal or identical pitch S, resulting from the axial distance of immediately adjacent inner peaks of the individual thread flanks in a respective thread profile section. Thus, in a made with the thread roll 100 according to the invention screw self-locking effect with respect to a nut screwed thereon, the defined by the width of the groove 15 from D stood between the two adjacent thread profile sections in relation to the thread pitch S is chosen or set, that the distance D entwe the larger or smaller than an integer multiple i of the thread pitch S is dimensioned. In other words, for the relation of D to S, one of the following two inequalities is satisfied, ie

D> i · S

or

D <i · S,

it follows that

D i · S

applies, because, if none of the above conditions is met, ie if in the gap or groove a thread or several threads would fit smoothly dignity / would, then produced with such a thread roller Ge thread no self-locking effect or blocking effect for a screwed nut in the area of the gap. An embodiment may consist in that for the thread profile sections, a distance D = 1.4 mm and a thread pitch S = 1.5 mm are selected.

FIGS. 6 to 9 show, in different views, the thread rolling blank 10 according to a second embodiment, which, unlike the first embodiment, is essentially formed from two bodies. As can be seen in particular with reference to FIGS. 7 and 8, the threaded roller blank 10 comprises a first body 21 and a second body 22, which are arranged coaxially with each other with respect to the longitudinal center axis or axis of symmetry 10 ^' connected by means of screws 23, wherein the second body 22 egg NEN the first body 21 facing portion 22 ^' , which has the circumferential order circumferential surface or outer lateral surface 14-2, and a section of the From 22 ^' wegstreckenden smaller diameter neck portion 22 ^'' has. Through both bodies 21, 22, the through hole 13 extends coaxially to the axis of symmetry 10 ^' . The two peripheral surfaces 14-1, 14-2 are provided to form a thread. To ensure that provided for the formation of a thread circumferential surfaces 14-1, 14-2 of the two Kör by 21, 22 are arranged flush with each other or flush with each other, the first body 21 at its second body 22 side facing a tubular tapered and coaxial with the axis of symmetry 10 ^' extending projection 24, while on the first body 21 facing side of the second body 22 is a circumferential and axially projecting annular shoulder 26 is formed with a contour complementary to the extension 24, so that the Ringschul ter 26 with its inner contour - In mounting position of the two bodies 21, 22 - can overlap the associated outer contour of the extension 24, wherein the order circumferential surfaces 14-1, 14-2 are arranged in alignment with each other in the axial direction. The inner contour of the annular shoulder 26 and the complementary outer contour of the extension 24 are formed as cylinder jacket surfaces. Between the annular shoulder 26 and the edge facing the outer circumferential surface 14-1 of the first body 21 is an annular spacer 27 see provided, the outer diameter about the outer diameter of the first Kör pers 21 and the outer diameter of the second body 22 in the region of the annular shoulder 26 and the outer lateral surface 14-2 corresponds, while its inner diameter approximately corresponds to the outer diameter of the extension 24 of the first Kör pers 21, so that the annular spacer 27, the extension 24th can enclose. As a result, 27 is formed in the installed state of the spacer an axial gap between the outer edge of the extension 24 and the adjacent side of the second body 22 thereto, since the annular dis dance disk 27 between the annular shoulder 26 and the edge facing the peripheral surface 14-1 of first body 21 is clamped and thus the gap or offset 25 between the provided for the thread to catch surfaces 14-1, 14-2 forms. To the two bodies 21, 22 rotatably connect each other, are in the portion 22 ^'of the second body plurality of spaced apart through holes 23 evenly in circumferential direction ^22' formed from, which blind holes 23 are assigned ^'', which on the side facing the second body 22 contact side of the first body 21 are provided to receive screws 23 which ^'pass through and then into the blind bores ^23', the through holes 23 ^'engage. The bores 23 ^' , 23 ^'' extend parallel to the longitudinal center axis 10 ^' and are at the same chem radius with respect to the longitudinal central axis 10 ^' . For additional security is at a smaller radius with respect to the longitudinal central axis 10 ^' in the second body 22 outgoing from the plant side blind hole 29 ^' vorgese hen, - with the same radius - a blind hole 29 ^'' in the first body 21 is opposite, with both blind holes 29 ^' , 29 ^'' parallel to the longitudinal axis of the central axis 10 ^' are arranged to extend in order to accurately fit a backup pin 29.

In procedural terms, according to a first variant of the method, first the spacer 27 is inserted between the two bodies 21, 22, then the two bodies are rotatably screwed together with the interposed DIV disc 27 and then the grinding operation of the two circumferential surfaces 14-1, 14- 2 carried out, wherein two by the spacer 27, the outer radius is slightly smaller than the Außenradi us the two peripheral surfaces 14-1, 14-2 dimensioned, beabstan ended threaded profile passages are formed whose distance or Gewindestei supply offset by the thickness of the spacer 27th is defined.

According to a second variant of the method, first the two bodies 21, 22 of the thread rolling blank 10 are added together without the spacer 27, after which the grinding operation at the two close to each other Peripheral surfaces 14-1, 14-2 carried out and then after completion of the grinding process, a thread pitch offset generated by the two bodies 21, 22 separated from each other, the spacer 27 set therebetween and the two bodies 21, 22 with interposed spacer 27 to sammengefügt and rotationally fixed screwed together, the axial width of the spacer 27 determines the thread pitch offset ..

According to a third variant of the method, which is a modification of the first Ver variant, initially the spacer 27 between the body 21, 22 used, then the two bodies with the interposed inwardly recorded spacer 27 rotatably connected or screwed together and then the Grinding operation of the two peripheral surfaces 14-1, 14-2 carried out; in contrast to the first variant of the method but depending on the end of the grinding process, the spacer 27 is exchanged for another at a spacer, which is either slightly wider or ge slightly narrower than the originally used spacer dimensioned to achieve the desired thread pitch offset.

According to a fourth variant of the method, the two bodies 21, 22 of the thread rolling blank 10 are first assembled without spacer 27, then the grinding process is carried out on the two closely adjacent peripheral surfaces 14-1, 14-2 and then the two bodies 21, 22 are separated from each other separated to ablate on the peripheral surfaces 14-1, 14-2 one of the two sides of the plant, which separate the two peripheral surfaces 14-1, 14-2 from each other, to a predetermined extent and then the two bodies 21, 22 together again, wherein a achieved by the removal Ge generated Ge slope gradient offset.

10 to 12 show in different views the thread rolling blank 10 according to a third embodiment, which is formed essentially of two Kör pern and differs from the second embodiment in that the pitch offset between the peripheral surfaces 14-1, 14-2 He is thereby aims that, after the grinding process to form the thread in the body 21, 22 are rotated against each other and then connected in rotation with each other in the rotated position by means of screws 23. For this purpose, the first body 21 has a front portion 21 ^' with the first peripheral surface 14-1 and a tapered or diametrically extending therethrough neck portion 21 ^" , while the annular second body 22 has the second peripheral surface 14-2 and the neck portion 21 ^" so to conclude that the two peripheral surfaces 14-1, 14-2 are arranged closely adjacent to each other. The front portion 21 ^'of the first body 21 is penetrated by a plurality of through holes 23 ^' , which extend parallel to the longitudinal central axis 10 ^' and are arranged uniformly spaced in the circumferential direction of the body 21. The through holes 23 ^'of the first Kör pers 21 blind holes are 23 ^"assigned in the annular second Kör by 22 to 23 ^' take the screws 23, which pass through the through holes 23 ^'of the first body 21, in the associated blind holes 23 ^" and to anchor it. To after the formation of a thread profile in the two outer circumferential surfaces 14-1, 14-2, the two bodies 21, 22 to rotate continuously against each other, the through holes 23 ^' in the first body 21 are formed as elongated holes whose respective width in the circumferential direction of the body 21, 22 runs and is uniformly sized. As a result, a continuously adjustable pitch offset between the two threaded sections can be achieved.

In terms of process engineering, the two bodies 21, 22 are initially connected or screwed together in such a way that the screws 23 are in one of two lateral end stop positions with respect to their oblong holes 23 ^' . In this Endanschlagstellung is then introduced by grinding the Ge winch profile in the two closely spaced circumferential surfaces 14-1, 14-2 of the tool blank 10; after completion of the grinding who loosened the screw or loosened, whereupon the two bodies are rotated in the circumferential direction by an angle to each other, which is in the context of the - extending in the circumferential direction - length of Längslö cher 23 ^' fixed angle range. In this rotational position, the two bodies 21, 22 are fixed to each other by tightening the screw connections. The set rotation angle thus determines the thread pitch offset between the peripheral surfaces 14-1, 14-2. An alternative alternative to this method is that initially the two bodies 21, 22 are connected or screwed together in such a way that the screws 23 are in an intermediate position. see the two lateral Endanschlagstellungen intermediate position with respect to their slots 23 ^' are located. In this position, the thread profile is introduced into the two circumferential surfaces 14-1, 14-2 by grinding. The closing of after loosening the screw against each other taking place twisting of the two bodies 21, 22 can be done due to the intermediate starting position both clockwise and counterclockwise to set the thread pitch offset between the two peripheral surfaces 14-1, 14-2.

13 to 16 show in different views the threaded roller blank 10 according to a fourth embodiment, which is essentially formed from two bodies 21, 22 and differs from the third embodiment in that the thread pitch offset between the two peripheral surfaces 14-1 , 14-2 is stepped adjustable. As can be seen in particular from FIG. 14, the thread rolling blank 10 comprises a first body 21 and a second body 22 which are connected to each other with respect to the longitudinal center axis or axis of symmetry 10 ^' coaxially with one another by means of screws 23, wherein the second body 22 a the first body 21 facing portion 22 ^' , which has the peripheral peripheral surface 14-2, and one of the Ab section 22 ^' extending away smaller-diameter neck portion 22 ^'' has. Through both bodies 21, 22, the through hole 13 extends coaxially to the axis of symmetry 10 ^' . The two peripheral surfaces 14-1, 14-2 are provided to form a thread. To ensure that provided for the formation of a thread circumferential surfaces 14-1, 14-2 of the two Kör by 21, 22 are arranged flush with each other or flush with each other, the first body 21 at its second body 22 side facing a tubular tapered and coaxial with the axis of symmetry 10 ^' extending projection 24, while on the first body 21 facing side of the second body 22 is a circumferential and axially projecting annular shoulder 26 is formed with a contour complementary to the extension 24, so that the Ringschul ter 26 with its inner contour - In mounting position of the two bodies 21, 22 - can overlap the associated outer contour of the extension 24, wherein the order circumferential surfaces 14-1, 14-2 are arranged in alignment with each other in the axial direction. The inner contour 26 ^'of the annular shoulder 26 and the complementary Au- The outer contour 24 ^'of the extension 24 are formed as toothed surfaces (FIG. 15) or, according to an alternative embodiment, as polygonal surfaces (FIG. 16).

In terms of process engineering, the two bodies 21, 22 are firstly connected or screwed together in such a way that the screws 23 are located in one of two lateral end stop positions with respect to their oblong holes 23 ^' , wherein the contour profiles of the two bodies complement each other. In this Endanschlagstellung is then introduced by grinding the thread profile in the two closely spaced peripheral surfaces 14-1, 14-2 of the tool blank 10; After Been the grinding, the screw connections are loosened or ge solves that the two bodies 21, 22 can be rotated in the circumferential direction by an angle to each other, which in the context of the - in order circumferential direction - length of the longitudinal holes 23 ^' specified Winkelbe rich lies and also the contour profiles of the two bodies can engage each other latching. In this rotational position, the two bodies 21, 22 are fixed to each other by tightening the screw, wherein the contour profiles of the two bodies remain in engagement with each other. The adjustable in stages according to the ge selected contour profiles rotation angle thus determines the thread pitch offset between the peripheral surfaces 14-1, 14-2.

17 to 19 show, in different views, the thread rolling blank 10 according to a fifth embodiment, which is essentially formed from two bodies 21, 22 and differs from the other embodiments by structural features with which a centering of the two bodies 21, 22 to each other is possible. For this purpose, the substantially hollow-cylindrical trained front body 21 has a peripheral surface 14-1, while the rear body 22 has a first portion 22 ^' and a coaxial there from forterstreckenden smaller diameter neck portion 22 ^'' . The portion 22 ^' has a peripheral surface 14-2, whose outer radius corresponds to the outer radius of the body 21 and its peripheral surface 14-1. In mitei associated with each other state of the body 21, 22 form their axially nebeneinan the arranged peripheral surfaces 14-1, 14-2, the entire peripheral surface 14 of the thread rolling blank 10. Here are the facing contact sides of the two bodies 21, 22 each as a plane Areas formed, the one Forming division plane, which extends between the peripheral surfaces 14-1, 14-2 and perpendicular to this. In order to connect the two bodies 21, 22 rotatably together, are - in an analogous manner to the second embodiment - in section 22 ^'of the second body 22 three circumferentially uniform vonei nander spaced through holes formed which three holes 23 are assigned to the the second body 22 facing Anlagesei te of the first body 21 are provided to receive three screws 23 which pass through the through holes 23 ^' and then terminate in the bores of the first body 21. The holes of the first body 21 and the corresponding holes to the second body 22 extend paral lel to the longitudinal central axis 10 ^' and are at the same radius with respect to the longitudinal central axis 10 ^' . For additional security and centering three outgoing in the second body 22 of the plant side blind holes are provided with which blind holes in the first body 21 korrespondie ren, the blind holes of the first body 21 and the korres ponding blind holes of the second body 22 parallel to the longitudinal telachse tel 10th ^' Running are arranged to fit in each case a Si cherungsstift 29 accurately fit. The respective holes for the locking pins 29 are spaced uniformly in the circumferential direction of the blank 10 and the body 21, 22, wherein the holes for the three screws 23 and the holes for the three locking pins 29 are arranged alternately in the circumferential direction Rich.

In procedural terms, the same process variants as in the second embodiment.

20 to 23 show in different views the thread rolling blank 10 according to a sixth embodiment, which is essentially formed of two bodies 21, 22 and differs from the fifth embodiment in that the thread pitch offset between the two peripheral surfaces 14- 1, 14-2 is stepped adjustable. For this purpose, a total of three receiving holes 31, 31 ^' , 31 ^''are provided in the front body 21 for receiving a dowel 30, which are formed as stepped holes, parallel to the longitudinal central axis 10 ^' and are arranged in the radial direction in alignment with each other, so that the three Receiving bores 31, 31 ^' , 31 ^'' at different different radii with respect to the Längsmitelachse 10 ^' lie. In contrast, the rear body 22 on its side facing the first body 22 attachment side of the receiving bores 31, 31 ^' , 31 ^'' associated crowd of in the embodiment, six blind holes 32, 32-1, 32-2, 32 ^' , 32 ^' -l,

32 ^'' , which are parallel to the Längsmitelachse 10 ^' and are arranged into three groups, wherein a first group has three blind holes 32, 32-1, 32-2 on an outer radius ri, which in the circumferential direction of the body 22 closely from each other are spaced, a second group has two Sacklochboh ments 32 ^' , 32 ^' -1 on a miter radius r ₂ , which are spaced in the circumferential direction Rich of the arc defined by the radius, and a drite group a blind hole 32 ^'' on an inner radius r ₃ has. The three blind bores 32, 32-1, 32-2 of the first group are arranged on the circular arc segment defined by the radius ri, so as to span an angular range extending from an angle oti to an angle ot ₂ ; the two blind holes 32 ^' , 32 ^' -1 of the second group are arranged on a circular arc with a smaller radius r ₂ and span a Win kelbereich extending from an angle ßi up to an angle ß ₂ , while the single blind hole 32 ^'' The third group is arranged on a circle arc with the smallest radius r ₃ at an angle g, which is within the angular interval [oti, a ₂ ] and the angular interval [ßi, ß ₂ ], which applies to these angles oti <ßi <a ₂ <ß ₂ and ßi <g <a _{2 is} fulfilled, ie the maximum angular range is formed by the interval [oti, ß ₂ ]. Since the two extreme angular positions are correlated by oti and ß ₂ with the blind holes 32 and 32 ^' -1, which - in the radial direction - with the two Endan impact positions of the circumferentially offset by 180 ° thereto arranged long hole 23 ^{' are} aligned the correlated with oti rotational position of the second Kör pers 22 to the first body 21 realized by the dowel pin 30 is inserted into the bore 31 and dips into the blind hole 32, while the ß ₂ kor associated rotational position of the second body 22 to the first body 21 realized is by the dowel pin 30 is inserted into the bore 31 ^' and in the Sacklochboh tion 32 ^' -1 is immersed. Interposed angular positions of the second body 22 to the first body 21 at the angles ßi, g, a ₂ are realized by the dowel pin 30 couples the respective angle corresponding blind hole bore with each axially aligned hole in the first body 21 and locked. To both bodies 21, 22 without providing a mark mitei- to be able to couple nander, are - according to the number of slots - three identical trained sets of circumferentially uniformly spaced apart and arranged in groups blind holes vorgese hen.

In terms of process engineering, the two bodies 21, 22 are initially connected or screwed together in such a way that the screws 23 are in one of two lateral end stop positions with respect to their oblong holes 23 ^' . In this end stop position, the thread profile is then looped into the two closely spaced peripheral surfaces 14-1,

14-2 of the tool blank 10 introduced; after completion of the grinding who loosened the loosened so far or loosened that the two Kör by 21, 22 Kings are rotated gradually in the circumferential direction against each other NEN, wherein the provided by the dowel holes in the two bodies 21, 22 depending on the dowel position six different angles of rotation are adjustable bar and fixable. In such a rotational position, the two Kör by 21, 22 fixed by tightening the screwed together. The adjustable in stages rotation angle thus determines the thread pitch offset between the peripheral surfaces 14-1, 14-2.

Claims

claims

1. A method for producing a thread roller from a tool blank, wherein the tool blank is provided on its peripheral surface with at least one Ge wineprofil, characterized in that the peripheral surface

(14) is divided into axially adjacent peripheral portions (14-1, 14-2) that directly or indirectly thereafter the thread profile in the peripheral surface (14) of the tool blank (10) is introduced, wherein ge separated thread profile sections with a in the Be formed range of pitch between threaded pitch offset.

2. The method according to claim 1, characterized in that for dividing the peripheral surface (14) in the circumferential direction of the tool blank (10) on the peripheral surface (14) circumferential gap (15) is incorporated, which the order circumferential surface (14) spaced from each other Circumferential sections (14-1, 14-2) separates, and that then the thread profile in the peripheral portions (14-1, 14- 2) having peripheral surface (14) is introduced, defined by the circulating de gap (15) of the thread pitch offset becomes.

3. The method according to claim 2, characterized in that the gap (15) is formed with a width which is unequal to an integer multiple of a selected thread pitch.

4. The method according to claim 2 or 3, characterized in that the gap

(15) is formed as a circumferential groove.

5. The method according to any one of claims 1 to 3, characterized in that the tool blank (10) from at least two bodies (21, 22) is formed, wherein peripheral surfaces of the at least two bodies (21, 22) in Zusammengemg TEM state of the tool blank ( 10) serve as axially adjacent to catch portions (14-1, 14-2) for the thread profile sections.

6. The method according to claim 5, characterized in that at least one spacer (27) between the at least two bodies (21, 22) is arranged, through which the mutually separated sections (14-1, 14-2) of intended be stood, being determined by the width of the spacer (27) of the thread pitch offset.

7. The method according to claim 6, characterized in that the Distanzschei be (27) before forming the thread profile in the tool blank (10) is added.

8. The method according to claim 6, characterized in that the Distanzschei be (27) after the formation of the thread profile in the tool blank (10) is inserted.

9. The method according to claim 5, characterized in that after forming the thread profile on facing each other and circumferentially duri fenden peripheral edges of the thread profile sections formed to catch portions (14-1, 14-2) at least one of perpendicular to the Umfangsrän countries extending plant sides removed is to achieve by a reduction in the axial width of the associated peripheral portion (14-1, 14-2) the thread pitch offset.

10. The method according to claim 5, characterized in that after forming the thread profile, the at least two bodies (21, 22) arranged in the circumferential direction of the tool blank (10) by a predetermined angular extent compared to a set before forming the thread profile starting position against each other and twisted the twisted angular position are determined to be rotationally fixed to each other.

11. Thread roller with at least one formed on its peripheral surface thread profile, characterized in that the peripheral surface (14) is divided into we least two axially adjacent thread profile sections, wherein a thread pitch offset between mutually facing ends of the threaded portions (14-1, 14-2) is trained.

12. Thread roller according to claim 11, characterized in that the thread derolle at least two bodies (21, 22), wherein peripheral surfaces of the we- at least two bodies (21, 22) serve as axially adjacent thread profile sections.

13. Thread roller according to claim 12, characterized in that at least one spacer (27) between the at least two bodies (21, 22) is arranged, is determined by the width of the thread pitch offset.

14. Thread roller according to claim 13, characterized in that the spacer disc (27) has an outer diameter which is smaller than the outer diameter of the peripheral surface (14) is dimensioned.

15. Thread roller according to claim 12, characterized in that between mutually facing edges of the Gewindprofilabschnite (14-1, 14-2) is formed a phase jump of the thread profile.

16. Thread rolling head, in particular Tangentialrollkopf, with at least one Ge winderolle according to one of claims 11 to 15.