EP2792429A1 - Tête axiale à rouler les filets et procédé de formation d'un filetage extérieur sur une pièce à l'aide d'une tête axiale à rouler les filets - Google Patents

Tête axiale à rouler les filets et procédé de formation d'un filetage extérieur sur une pièce à l'aide d'une tête axiale à rouler les filets Download PDF

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Publication number
EP2792429A1
EP2792429A1 EP13002074.6A EP13002074A EP2792429A1 EP 2792429 A1 EP2792429 A1 EP 2792429A1 EP 13002074 A EP13002074 A EP 13002074A EP 2792429 A1 EP2792429 A1 EP 2792429A1
Authority
EP
European Patent Office
Prior art keywords
thread
workpiece
profile
axial
rolling head
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP13002074.6A
Other languages
German (de)
English (en)
Other versions
EP2792429B1 (fr
Inventor
Andreas Focken
Frank Smidt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LMT Fette Werkzeugtechnik GmbH and Co KG
Original Assignee
LMT Fette Werkzeugtechnik GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by LMT Fette Werkzeugtechnik GmbH and Co KG filed Critical LMT Fette Werkzeugtechnik GmbH and Co KG
Priority to EP13002074.6A priority Critical patent/EP2792429B1/fr
Priority to HUE13002074A priority patent/HUE032474T2/en
Priority to US14/256,453 priority patent/US9468969B2/en
Publication of EP2792429A1 publication Critical patent/EP2792429A1/fr
Application granted granted Critical
Publication of EP2792429B1 publication Critical patent/EP2792429B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H3/00—Making helical bodies or bodies having parts of helical shape
    • B21H3/02—Making helical bodies or bodies having parts of helical shape external screw-threads ; Making dies for thread rolling
    • B21H3/04—Making by means of profiled-rolls or die rolls
    • B21H3/042—Thread-rolling heads
    • B21H3/044—Thread-rolling heads working axially

Definitions

  • the invention relates to an axial thread rolling head, comprising a head part, in which at least three thread rollers are rotatably mounted, wherein the thread rollers define an insertion section for a workpiece between them, and wherein the thread rollers each have a profile for forming an external thread on the workpiece.
  • the invention also relates to a method of forming an external thread on a workpiece with an axial thread rolling head.
  • Axialgewinderollkö With such Axialgewinderollköpfen be produced by cold forming external thread on usually cylindrical workpieces.
  • the thread rollers have a profile at their periphery.
  • the workpiece is introduced in the course of a relative movement between the Axialgewinderollkopf and the workpiece in the insertion of the Axialgewinderollkopfes, wherein the external thread is produced by the profile of the thread rollers.
  • Axial thread rolling heads are known in which, after complete formation of the external thread on the workpiece, in particular complete insertion of the workpiece into the insertion section of the axial thread rolling head, the axial thread rolling head is opened by a mechanical actuating mechanism. The threaded rollers are moved radially outward and the Axialgewinderollkopf can be deducted from the workpiece without the thread rollers collide with the workpiece, so get into engagement. This results in a simple processing with precisely manufactured external threads.
  • a disadvantage is a comparatively large space requirement for the radial movement of the thread roller bearing including the threaded rollers disposed thereon in the working space of the processing machine.
  • This workspace must of course also include the workpiece contour.
  • the Actuating mechanism for radially adjusting the thread rollers outward in the Axialgewinderollkopf even a considerable space required. Due to the increasingly desired component reduction, for example in the automotive sector, the space available during machining becomes ever smaller. An example is the production of external threads on cylindrical lugs of fuel injection strips of an automobile. At the trained external threads pressure lines can be connected. Due in part to the enormous operating pressures, there are very high demands on the accuracy and thus tightness of the threads produced.
  • the invention is based on the cited prior art, therefore, the object to provide a Axialgewinderollkopf and a method of the type mentioned, with which relatively large diameter can be made reliably and precisely in the given manner with small outer dimensions of the Axialgewinderollkopfes.
  • the invention solves the problem on the one hand by a Axialgewindeollkopf comprising a head part in which at least three thread rollers are rotatably mounted, wherein the thread rollers define an insertion section for a workpiece between them, and wherein the thread rollers each have a profile for forming an external thread on the workpiece wherein the thread rollers are held in the radial direction unadjustable in the head part, and wherein the profile of the thread rollers is in each case asymmetrically formed so that the thread rollers form a symmetrical external thread with its asymmetrical profile on the workpiece.
  • the Axialgewindeollkopf may also include a shaft which holds the head part.
  • the thread rollers also called profile rollers, limit the axial thread rolling head according to the invention in a manner known per se between itself an insertion section for a cylindrical workpiece to be machined, for example.
  • the thread rollers By a suitable relative movement between Axialgewinderollkopf and workpiece, the workpiece is inserted into the insertion section, wherein the cross section of the workpiece is so large that engages the profile of the thread rollers in the outer surface of the workpiece and is created by cold deformation, an external thread in the workpiece.
  • the thread rollers in a conventional manner have a profile extending over its circumference.
  • the thread rollers have a profile formed from pitch-free tread grooves, so a groove profile.
  • the spacing of the grooves corresponds to the pitch of the thread to be formed on the workpiece.
  • three threaded rollers can be provided, which are each provided at 120 ° spaced from one another over the circumference of the insertion section.
  • the axial thread rolling head according to the invention is non-opening.
  • no actuating mechanism is provided, which moves the thread rollers in the radial direction after the external thread has been formed on the workpiece. Rather, the thread rollers are unadjustable in the radial direction, that is fixedly arranged in the Axialgewinderollkopf.
  • the cross section of the insertion of the Axialgewinderollkopfes is therefore unchangeable in the axial thread rolling head according to the invention, except for an inevitable springing of the thread rolls in the course of processing.
  • an unavoidable springing up of the thread rolls in the course of processing is taken into account and compensated according to the invention in that the thread rolls have a suitable asymmetrical profile or groove profile.
  • the thread rolls have a suitable asymmetrical profile or groove profile.
  • opposite profile flanks are therefore not mirror-symmetrical, in particular with respect to a radial direction through the bottom or the lowest point between the profile flanks running straight line.
  • the asymmetric profile according to the invention is adapted so that it forms a symmetrical thread profile on the workpiece taking into account the expected on the respective material and cross section of the workpiece to be machined on the one hand and the constructive Gepressionnism the Axialgewinderollkopfs, in particular its dimensions, on the other expected springback of the thread rolls.
  • the inventive design of the Axialgewinderollkopfes it is possible to work in a precise manner and workpieces with a relatively large cross-section using a Axialgewinderollkopfes with a relatively small outer contour reshaping.
  • the required space is reduced compared to the prior art because the axial thread rolling head is non-opening.
  • the asymmetric formation of the profile of the thread rolls ensures that the thread formed on the workpiece is precisely symmetrical. It will thus reliably and precisely produced the desired external thread.
  • the design boundary conditions of the axial thread rolling head in particular, for example, materials and material thicknesses, it is ensured that the requirements with regard to function, strength and service life are reliably met.
  • the life of the Axialgewinderollkopfes and its thread rolls can be ensured by the choice of a suitable material and a corresponding heat treatment.
  • the profile of the external thread to be produced is therefore completely formed only by insertion into and removal of the workpiece from the insertion section.
  • deformation is also carried out when the workpiece is being removed.
  • the insertion or removal refers to a relative movement between the workpiece and Axialgewinderollkopf, in the course of which the workpiece is inserted into the insertion or out of the insertion of the Axialgewinderollkopfes.
  • a movement of the Axialgewinderollkopfes or the workpiece is possible.
  • a movement of both Axialgewinderollkopf and workpiece is possible.
  • the profile of the thread rolls can each form a pointed profile with straight flanks.
  • the profile flanks are each in a straight plane, wherein the planes of the mutually opposite profile flanks are at an angle to each other.
  • the angle formed between two opposing profile flanks is less than 90 °.
  • adjacent profile flanks can merge into one another in a rounded head area.
  • mutually opposite profile edges can merge into one another in a likewise rounded bottom region.
  • a leading flank angle of the profile of the thread rolls is in each case in a range between 28.0 ° and 30.0 °, preferably 29.5 °.
  • a trailing edge angle The profile of the thread rolls can then each be in a range between 30.0 ° and 32.0 °, preferably 31.0 °.
  • a leading edge angle in this context, the angle between the leading during insertion of the workpiece into the insertion section and a flanks extending through the bottom or lowest point between mutually opposite profile edges radials.
  • the angle between the leading edge of the profile opposite, the trailing in the insertion section trailing profile flanks, and extending through the bottom or lowest point between opposing profile flanks radial is referred to as the trailing edge angle.
  • the leading flank angle and the trailing flank angle are different according to the invention, so that the profile has the above-described asymmetry. If the mutually opposite profile flanks, ie leading and trailing profile flanks, are not in a respective straight plane, but have a curvature, for example, the angles can each be formed between a tangent, for example, halfway up the curved profile flanks, and the respective radials.
  • the thread pitch is the distance between the center of two adjacent thread sections in the direction of the thread roll longitudinal axis.
  • the thread pitch corresponds to the thread pitch, ie the distance in the direction of the threaded roller longitudinal axis about which, for example a nut would move on the thread at a full turn 360 °.
  • the thread pitch or the thread pitch may not be too large, especially for small Axialgewinderollköpfen, which in particular have a small diameter and thus usually a small wall thickness.
  • a ratio between the diameter of the thread rolls and the diameter of the workpiece to be machined may each be less than 1.4.
  • a ratio between the diameter of the at least partially cylindrical portion of the head portion and the diameter of the workpiece to be machined may be smaller than 3.8.
  • the head part can be made up of several sections.
  • the head part can also have a plurality of cylindrical sections.
  • the at least partially cylindrical portion referred to in the aforementioned embodiments is the thread roller supporting portion having the largest cross section or diameter.
  • the head part may comprise a base portion and a top plate attached to the base portion.
  • the top plate provides additional stability of the axial thread rolling head and reduces spring deflection of the thread rolls.
  • the threaded rollers can be rotatably mounted in the base portion and / or the top plate and kept unadjustable in the radial direction.
  • the base portion may be integrally formed. In particular, it may comprise one or more cylindrical sections of the head part.
  • the one-piece design of the head part results in the non-opening Axialgewinderollkopf invention to a particularly high stability and load capacity during operation.
  • the thread rollers can be fixed in each case between a stop surface of the base portion and a stop surface of the top plate in the axial direction.
  • the threaded rollers may also be rotatably mounted on axle pins held in the base section. These are also particularly practical embodiments.
  • corresponding receptacles may be provided in the base portion and in the top plate.
  • the longitudinal axes of the axle pins are inclined relative to the insertion direction of the workpiece in the insertion, such that the insertion section tapers in the insertion direction of the workpiece.
  • the top plate is screwed by a plurality of fitting screws with the base portion.
  • the thread rolls arranged one behind the other in the longitudinal direction of the thread rolls each have a first asymmetric profile section and a second asymmetric profile section for forming an external thread on a workpiece, wherein the thread rollers each with either the first profile section or the second profile section can be aligned with the entrance of the insertion section to form an external thread with either the first profile section or the second profile section on the workpiece.
  • the profiles are formed twice on each thread roll, in the opposite direction, starting from the two end faces of the thread rolls or starting from the middle of the thread rolls. It can then, depending on the direction in which the thread rollers are inserted into the head part, the first or the second profile section are used for thread forming on the workpiece.
  • the length of the thread rollers is designed such that a complete shaping of the thread to be produced on the workpiece is possible without the respectively in the insertion direction of the workpiece rear of the two profile sections comes into engagement with the workpiece.
  • the first Profile section and the second profile section in each case be mirror-symmetrical to a perpendicular to the longitudinal axis of the respective thread roller.
  • the first profile section and the second profile section are each not mirror-symmetrical to a perpendicular to the longitudinal axis of the respective thread roller, so are formed differently. As a result, a greater flexibility in the machining is achieved, since the two profile section can be adapted for processing different workpieces.
  • the invention also relates to a method for forming an external thread on a workpiece with an axial thread rolling head according to the invention, in which the workpiece is introduced by a relative movement between the workpiece and Axialgewinderollkopf in the axial direction in the insertion of the Axialgewinderollkopfes and again led out of this, said by the asymmetric profile the thread rolling both during insertion of the workpiece in the insertion and when leading out the workpiece from the insertion takes place a shaping processing of the external thread of the workpiece.
  • the axial thread rolling head according to the invention it is possible to use the axial thread rolling head according to the invention to also form external threads on workpieces made of high-strength materials.
  • the workpieces processed according to the invention can have tensile strengths of more than 600 N / mm 2 , preferably more than 900 N / mm 2 , more preferably more than 1000 N / mm 2 .
  • tensile strengths of more than 600 N / mm 2 , preferably more than 900 N / mm 2 , more preferably more than 1000 N / mm 2 .
  • the in Fig. 1 Axialgewinderollkopf invention shown comprises a shaft 10 and held by the shaft 10 head portion 12.
  • the shaft 10 has a clamping portion 14, which serves for clamping in a suitable machine tool. It should be noted that it is also conceivable that the head part 12 itself has a clamping portion for clamping in a machine tool. In this case, no shaft 10 would be required.
  • the shaft 10 also has an enlarged portion 16 and a cylindrical bearing portion 18.
  • the head portion 12 has a first cylindrical portion 22, with which it is fixedly connected via a plurality of fastening screws 20 with the bearing portion 18 of the shaft 10.
  • a second cylindrical portion 24 connects, wherein the cylindrical portions 22, 24 are integrally formed and together form a base portion of the head portion 12.
  • the second cylindrical portion 24 has a larger diameter than the first cylindrical portion 22.
  • three threaded rollers 26 are rotatably mounted about the longitudinal axis in the head part 12.
  • the three threaded rollers 26 are arranged distributed uniformly along a circular path, in each case at intervals of 120 °.
  • the threaded rollers 26 are each rotatably supported on axle pins 28 held in the second cylindrical portion 24.
  • the base portion of the head portion 12 formed by the cylindrical portions 22 and 24 is closed by a head plate 32 fixed to the second cylindrical portion 24 by means of fitting screws 30.
  • Such as in the FIGS. 2 and 3 to recognize the thread rollers 26 define between them an insertion portion 34 for a machined with the axial thread rolling head, for example, cylindrical workpiece.
  • the longitudinal axes of the axle pins 28, which may be, for example, hard metal axle pins, compared to the insertion of the workpiece in the insertion section 34, which at the same time in Fig. 4 corresponding to the longitudinal axis of the Axialgewinderollkopfes shown at 36, are inclined.
  • the inclination is such that the insertion portion 34 tapers in the insertion direction of the workpiece.
  • the inclination angle of the axle pins 28 and thus the longitudinal axes of the threaded rollers 26 relative to the longitudinal axis 36 of the head portion 12 may correspond to the pitch angle of the thread to be rolled.
  • axle pins 28 are each fixed in their position by a threaded pin 38 which presses in the radial direction into a suitable clamping surface of the axle pins 28. As a result, they can neither shift in the axial direction nor can they rotate about their own axis.
  • the thread rollers 26 each between a stopper surface 40 of the head plate 32 and a stopper surface 42 of the second cylindrical portion 24 of the base portion are fixed in the axial direction.
  • the second cylindrical portion of the base portion 24 and the top plate 32 have corresponding recesses for receiving the thread rollers 26.
  • the axial thread rolling head according to the invention shown in the figures is configured in a non-opening manner.
  • the threaded rollers 26 are held on the axle pins 28 in the radial direction immovably in the head part 12.
  • the threaded rollers 26 each have a running over its circumference profile, in particular a pitch-free groove profile. This profile is in Fig. 5 shown in section by way of example for one of the threaded rollers 26.
  • the profile 44 forms a pointed profile with straight profile flanks 46, 48.
  • the profile flanks 46, 48 lie in straight planes, which are arranged at an angle to one another which is smaller than 90 °.
  • the threaded rollers in the longitudinal direction of the threaded rollers arranged one behind the other each have a first asymmetrical profile section and a second asymmetrical profile section for molding a respective external thread on a workpiece.
  • the first profile section extends in the example shown in FIG Fig. 5 to the left of the central axis shown at reference numeral 49.
  • the two asymmetric profile sections are mirror-symmetrical to the central axis 49.
  • FIG. 6 is an enlarged detail of the in Fig. 5 To recognize left of the central axis 49 shown profile section.
  • the reference numeral 46 shows a profile flank of the profile 44 that leads in the course of inserting a workpiece into the insertion section.
  • At reference numeral 48 is one of the leading edge 46 opposite in the course of insertion of a Workpiece shown in the insertion section trailing profile edge.
  • a trailing edge angle ⁇ 2 between the trailing profile edge 48 and the radial 52 is in the example shown in a range between 30.0 ° and 32.0 ° and is preferably 31.0 °. It is understood that in the in Fig. 6 not shown, in Fig. 5 right profile of the central axis 49 profile shown the leading edge of the profile and the trailing edge of the profile and thus the leading edge angle and the trailing edge angle are reversed. The profile 44 of the profiled rollers 26 is thus formed asymmetrically, in particular with respect to the radial 52.
  • This asymmetry ensures the unrolling of the threaded rollers 26 in the course of processing high-strength materials with tensile strengths of, for example, more than 600 N / mm 2 , that in the course of introducing a cylindrical workpiece in the insertion section 34 and the lead out of the cylindrical workpiece the insertion portion 34 in a precise manner a predetermined symmetrical external thread is produced on the workpiece.
  • a ratio between the largest diameter of the head part 12, in particular the diameter of the second cylindrical portion 24, and the diameter of the workpiece to be machined is smaller than 3.8.
  • a ratio between the diameter of the thread rollers 26 and the diameter of the workpiece to be machined is smaller than 1.4, respectively.
  • the ratio between the diameter of the head portion 12, in particular the diameter of the second cylindrical portion 24, and the diameter of the thread pitch of the profiles of Thread roll 26 is important to the stability of the system.
  • the stated ratio would be 26.667 and thus still sufficient stability of the system.
  • FIG. 7 shows FIG. 7 in which, with the axial thread rolling head according to the invention, a cylindrical projection 54 is provided with an external thread, which is formed on a component 56. As in Fig. 7 To recognize, the available work space is severely limited, in particular by an end portion 58 of the component 56.
  • the number of parts of the Axialgewinderollkopfes invention is reduced due to the non-opening design and therefore not required actuating mechanism over conventional Axialgewinderollköpfen.
  • the inventive design of the Axialgewinderollkopfs in addition to the compact design allows at any time sufficient load capacity during operation. This also applies to the machining of workpieces with a relatively large diameter. Since there is no possibility to influence the diameter of the rolled thread by a radial adjustment of the thread rolls in Axialgewinderollkopf, if necessary, threaded rollers with different diameter must be mounted to make an adaptation to material change, machine conditions, customer requests, etc.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Tires In General (AREA)
EP13002074.6A 2013-04-19 2013-04-19 Tête axiale à rouler les filets et procédé de formation d'un filetage extérieur sur une pièce à l'aide d'une tête axiale à rouler les filets Active EP2792429B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP13002074.6A EP2792429B1 (fr) 2013-04-19 2013-04-19 Tête axiale à rouler les filets et procédé de formation d'un filetage extérieur sur une pièce à l'aide d'une tête axiale à rouler les filets
HUE13002074A HUE032474T2 (en) 2013-04-19 2013-04-19 Axial thread cylinder head and method for forming a workpiece on a workpiece with an axial threaded cylinder head
US14/256,453 US9468969B2 (en) 2013-04-19 2014-04-18 Axial thread rolling head and method for forming an external thread on a workpiece with an axial thread rolling head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13002074.6A EP2792429B1 (fr) 2013-04-19 2013-04-19 Tête axiale à rouler les filets et procédé de formation d'un filetage extérieur sur une pièce à l'aide d'une tête axiale à rouler les filets

Publications (2)

Publication Number Publication Date
EP2792429A1 true EP2792429A1 (fr) 2014-10-22
EP2792429B1 EP2792429B1 (fr) 2016-12-14

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EP13002074.6A Active EP2792429B1 (fr) 2013-04-19 2013-04-19 Tête axiale à rouler les filets et procédé de formation d'un filetage extérieur sur une pièce à l'aide d'une tête axiale à rouler les filets

Country Status (3)

Country Link
US (1) US9468969B2 (fr)
EP (1) EP2792429B1 (fr)
HU (1) HUE032474T2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106312096A (zh) * 2016-09-21 2017-01-11 石家庄博深石油机械有限公司 一种基于成型刀具加工螺杆马达定子的方法
CN113967708A (zh) * 2021-11-26 2022-01-25 广东欧亚包装有限公司 一种ropp螺口器

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT202100003047A1 (it) * 2021-02-11 2022-08-11 Andrea Gasparini Filiera a rullare e attrezzatura per filettare che utilizza la suddetta filiera

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB567700A (en) * 1943-09-11 1945-02-27 Nino Bonamini Improved tool for forming external screw threads
CH389550A (fr) * 1963-03-08 1965-03-31 Habegger Harold Outil à fileter des pièces de petit diamètre
EP0552713A1 (fr) 1992-01-21 1993-07-28 Emuge-Werk Richard Glimpel, Fabrik für Präzisionswerkzeuge, vormals Moschkau & Glimpel Outil à rouler les filets

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2720801A (en) * 1951-12-19 1955-10-18 Wilhelm Fette Prazisionswerkze Rolling head
ES214356Y (es) * 1975-07-31 1976-12-01 Esteban Torralba Construccion perfeccionada aplicada a cojinetes de roscar por laminacion.
CH595173A5 (fr) * 1975-12-23 1978-01-31 Harold Habegger
JP2006043745A (ja) * 2004-08-06 2006-02-16 Nagoya Industrial Science Research Inst マルチピッチねじ、マルチピッチねじの製造方法及び製造装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB567700A (en) * 1943-09-11 1945-02-27 Nino Bonamini Improved tool for forming external screw threads
CH389550A (fr) * 1963-03-08 1965-03-31 Habegger Harold Outil à fileter des pièces de petit diamètre
EP0552713A1 (fr) 1992-01-21 1993-07-28 Emuge-Werk Richard Glimpel, Fabrik für Präzisionswerkzeuge, vormals Moschkau & Glimpel Outil à rouler les filets

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106312096A (zh) * 2016-09-21 2017-01-11 石家庄博深石油机械有限公司 一种基于成型刀具加工螺杆马达定子的方法
CN106312096B (zh) * 2016-09-21 2019-03-15 石家庄博深石油机械有限公司 一种基于成型刀具加工螺杆马达定子的方法
CN113967708A (zh) * 2021-11-26 2022-01-25 广东欧亚包装有限公司 一种ropp螺口器

Also Published As

Publication number Publication date
US20140311202A1 (en) 2014-10-23
US9468969B2 (en) 2016-10-18
HUE032474T2 (en) 2017-10-30
EP2792429B1 (fr) 2016-12-14

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