US20160354834A1 - Thread rolling tool - Google Patents

Thread rolling tool Download PDF

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Publication number
US20160354834A1
US20160354834A1 US15/117,763 US201515117763A US2016354834A1 US 20160354834 A1 US20160354834 A1 US 20160354834A1 US 201515117763 A US201515117763 A US 201515117763A US 2016354834 A1 US2016354834 A1 US 2016354834A1
Authority
US
United States
Prior art keywords
thread
roll
profile
profile roll
pipe end
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.)
Abandoned
Application number
US15/117,763
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English (en)
Inventor
Philipp Silberkuhl
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.)
Rothenberger AG
Original Assignee
Rothenberger AG
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 Rothenberger AG filed Critical Rothenberger AG
Assigned to ROTHENBERGER AG reassignment ROTHENBERGER AG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SILBERKUHL, PHILIPP
Publication of US20160354834A1 publication Critical patent/US20160354834A1/en
Abandoned legal-status Critical Current

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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
    • 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
    • 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

Definitions

  • the invention relates to a thread-rolling tool for rolling and/or repairing a thread, with (a) a clamping jig for fastening to a pipe end and (b) at least one profile roll for rolling a thread into the pipe end or for repairing a thread at the pipe end.
  • Such a thread-rolling tool is known, for example from DE 10 2012 004 701 A1.
  • a disadvantage of such a thread-rolling tool is that it is suitable only for cylindrical threads. In other words, conical threads cannot be rolled with such a tool.
  • the task of the invention is to propose a thread-rolling tool that is suitable for rolling and/or repairing a tapering, especially a conical thread.
  • the invention accomplishes the task by a thread-rolling tool of the class in question, in which the at least one profile roll tapers in a feed direction of the profile roll, so that a tapering, especially a conical thread can be rolled into the pipe end.
  • the invention is based on the knowledge that a conical thread can be produced when a conical profile roll is used. If this profile roll on the pipe end that runs out taperingly, especially conically, the profile roll comes into contact with the pipe end over a large portion of its shell surface. By rotating the profile roll on a helical path around the longitudinal axis of the pipe end, the profile roll cuts a thread into the pipe end.
  • the envelope contour of the profile roll i.e. the contour of the profile roll without the grooves, is therefore preferably shaped in a manner complementary to the contour of the tapering thread to be produced.
  • the profile roll has a conical basic structure, meaning that the groove crests lie on a conical surface. In this way a conical thread is obtained.
  • the clamping jig will be understood as a jig by means of which the thread-rolling tool can be fastened at the pipe end.
  • the clamping jig is designed for insertion into the pipe at the pipe end and for fastening of the thread-rolling tool at the pipe end by enlarging the outside diameter of the clamping jig, for example by radial outward movement of clamping elements.
  • the clamping jig may be actuated mechanically, pneumatically or hydraulically.
  • the clamping jig may also be based on a different clamping principle; for example it may represent a freeze-clamping chuck. However, this is frequently associated with increased expense.
  • the profile roll there will be understood a component by means of which a thread can be rolled into the pipe end.
  • the profile roll has a conical envelope contour, which means that the profile roll can be produced by machining the profile into a conical portion in the portion provided with the profile used for rolling the thread.
  • the profile roll is pitchless. This has the advantage that the thread can be rolled and/or repaired with particularly high process reliability and in simple manner.
  • the thread-rolling tool comprises a roll holder, on which the at least one profile roll is fastened and by means of which the at least one profile roll can be so guided helically around the pipe end that the at least one profile roll rolls a thread into the pipe end.
  • the profile roll can be guided helically around the pipe end, it will be understood that it can be guided on a helical path, which in particular is non-tapering, around the longitudinal axis of the pipe end.
  • the helical path tapers, which means that its diameter becomes smaller with increasing distance along the longitudinal axis, but this is not required.
  • the helical path widens.
  • the thread-rolling tool is constructed particularly simply when the roll holder moves on a helical path that neither tapers nor flares around the longitudinal axis.
  • the roll holder is coupled by means of a thread with the clamping jig, so that a rotation of the roll holder around the pipe longitudinal axis of the pipe end leads to an axial movement of the roll holder along the pipe longitudinal axis.
  • This represents a particularly simple and in addition process-reliable way of moving the roll holder on a helical path around the pipe longitudinal axis.
  • at least one of the threaded partners is made of hardened steel or of another hard material with a Rockwell hardness of at least 45 HRC.
  • the thread-rolling tool comprises at least one second profile roll, which is so fastened to the roll holder that the second profile roll, during rotation of the roll holder around the pipe longitudinal axis, rolls at least partly in grooves rolled by the first profile roll and that, in operation, it generates, in a direction at least partly opposed to a first passive force that acts on the first profile roll, a second passive force.
  • the second profile roll therefore leads to a smaller torque that must be applied on the thread-rolling tool in order to roll the thread.
  • the thread-rolling tool has a counter-element, which generates a second passive force directed at least partly opposed to the first passive force.
  • significant frictional force easily develops, which reduces the attainable quality for the thread and which greatly increases the torque necessary for actuation.
  • the second profile roll is preferably pitchless. It is favorable when the profile rolls are similarly structured, at least in the profiled portion.
  • the profile rolls are preferably identical. With respect to an axis of rotation of the first profile roll, the profile of the second profile roll is offset relative to the profile of the first profile roll.
  • the first profile roll is mounted to rotate around a first profile roll axis of rotation and the second profile roll is mounted to rotate around a second profile roll axis of rotation, wherein the second profile roll axis of rotation forms an angle of 0° to 2° with the first profile roll axis of rotation.
  • the first profile roll is mounted to rotate around a first profile roll axis of rotation and a first offset angle between the first profile roll axis of rotation (D 14 . 1 ) and the pipe longitudinal axis amounts to at most 2°, especially at most 1°. Preferably, however, the angle is quantitatively as small as possible.
  • the pipe longitudinal axis corresponds to the axis of rotation around which the roll holder can be rotated.
  • the fact that the offset angle exists does not necessarily mean that the longitudinal axis and the first profile roll axis of rotation intersect.
  • the offset angle is calculated according to the mathematical rules for angle calculation from the direction vectors of the vectorial representation of axis of rotation and longitudinal axis, wherein the direction vectors are chosen in particular such that the offset angle amounts to at most 90°.
  • the offset angle is always expressed positively, and so a theoretical angle of ⁇ 0.5°, for example, between axis of rotation and longitudinal axis is regarded as an offset angle of 0.5°.
  • the second profile roll is mounted to rotate around a second profile roll axis of rotation and a second offset angle between the second profile roll axis of rotation and the pipe longitudinal axis amounts to at most 2°, especially at most 1°.
  • the thread-rolling tool comprises at least one third profile roll, which is so fastened to the roll holder that the third profile roll, during rotation of the roll holder around the pipe longitudinal axis, rolls at least partly in the grooves produced by the first profile roll or the second profile roll and that, in operation, it generates a third passive force, which together with the first passive force and the second passive force adds up vectorially to zero.
  • the thread can be generated with a particularly small torque.
  • the third profile roll is mounted to rotate around a third profile roll axis of rotation and the third profile roll axis of rotation forms a third offset angle of at most 2°, especially of at most 1° with the pipe longitudinal axis, which corresponds to the axis of rotation of the roll holder.
  • the clamping jig has an actuating connecting piece, by means of which the clamping jig can be clamped and loosened and which extends in the direction of the pipe longitudinal axis.
  • the connecting piece is provided with a coupling structure, for example a male hexagon structure or a hexagon socket structure, so that the actuating connecting piece can be actuated with a complementary tool.
  • the invention additionally accomplishes the task by a method for producing or repairing a conical thread, with the steps of (i) fastening a thread-rolling tool according to the invention onto a pipe end by means of the clamping jig and (ii) rotating the roll holder, wherein the thread moves the roll holder axially along a pipe longitudinal axis of the pipe end, so that the at least one profile roll moves helically around the pipe longitudinal axis and rolls a conical thread into the pipe end or repairs the conical thread.
  • a thread is rolled with a thread width that corresponds at most to a profile roll width of a profile shell surface of the profile roll.
  • FIG. 1 a perspective view of a thread-rolling tool according to the invention
  • FIG. 2 a section through the thread-rolling tool according to FIG. 1 ,
  • FIG. 3 a profile roll with a conical envelope body
  • FIG. 4 a second perspective view of the thread-rolling tool.
  • FIG. 1 shows a thread-rolling tool 10 , which has a clamping jig 12 as well as a first profile roll 14 . 1 , a second profile roll 14 . 2 and a third profile roll 14 . 3 .
  • the profile rolls 14 (reference symbols without numerical suffix relate respectively to all corresponding objects) are mounted on a roll holder 16 .
  • the profile roll 14 . 1 is mounted to rotate around a first profile roll axis of rotation D 14 . 1
  • the second profile roll 14 . 2 can rotate around a second profile roll axis of rotation D 14 . 2
  • the third profile roll 14 . 3 can rotate around a third profile roll axis of rotation D 14 . 3 .
  • the three axes of rotation D 14 . 1 , D 14 . 2 and D 14 . 3 form an angle of at most 2°, especially at most 1° pairwise with one another.
  • the clamping jig 12 is designed for fastening to a pipe end 18 and for this purpose it has clamping elements 20 . 1 , 20 . 2 , . . . , which can be moved radially outward via a clamping cone 23 .
  • the clamping cone 22 has a thread—not visible in FIG. 1 —and, by turning of an actuating connecting piece 24 , can be thrust in axial direction corresponding to a pipe longitudinal axis L relative to the clamping elements 20 .
  • the clamping jig 12 is joined to the roll holder 16 via a thread 26 . If the clamping jig 12 is fastened securely to the pipe end 18 , and if the roll holder 16 is rotated around the longitudinal axis L, the profile rolls 14 move on a helical path around the longitudinal axis L.
  • FIG. 2 shows the thread-rolling tool 10 in a section perpendicular to the pipe longitudinal axis L.
  • FIG. 3 shows a detail view of a profile roll 14 . It can be seen that this tapers conically in the present embodiment. By this it will be understood that an imaginary envelope body 28 in the form of a truncated cone can be so fitted on the profile roll 14 that it contacts this along its shell surface. The points of contact lie on concentric rings, since the profile roll 14 is pitchless.
  • FIG. 4 shows the thread-rolling tool 10 in a further perspective view. It can be seen that the roll holder 16 has a coupling structure 30 , which in the present case is formed by a male hexagon structure. The coupling structure 30 is designed for interlocking interaction with a wrench having complementary coupling structure.
  • a method according to the invention is carried out by the fact that firstly the thread-rolling tool 10 is fastened to the pipe end 18 .
  • the thread-rolling tool 10 is inserted with its clamping jig 12 into the pipe end 18 .
  • the fastening connecting piece 24 is turned with a suitable tool, so that the jig 12 fastens the threading-roll tool 10 on the pipe end 18 .
  • the roll holder 16 is rotated. This may be done, for example, by attaching an associated wrench to the coupling structure 30 and turning it.
  • a drive for example an electric, pneumatic or hydraulic drive, for rotation of the roll holder 16 .
  • a positioning machine especially a machine tool or a robot, which comprises a thread-rolling tool according to the invention, is according to the invention.
  • the positioning machine may be designed for automatic insertion of the thread-rolling tool 10 into a pipe end 18 , for clamping of the clamping jig and for rolling of the roll holder 16 .
  • the positioning machine has a tool changer and/or a workpiece changer, so that a plurality of pipes can be machined at their respective pipe ends by cutting a tapering thread, especially a conical thread.
  • FIG. 1 shows a profile roll width B 14 of the profile roll.
  • the thread has a thread width that corresponds to B 14 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
US15/117,763 2014-02-12 2015-02-06 Thread rolling tool Abandoned US20160354834A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102014202579.6 2014-02-12
DE102014202579.6A DE102014202579A1 (de) 2014-02-12 2014-02-12 Gewinderollwerkzeug
PCT/DE2015/100048 WO2015120840A1 (fr) 2014-02-12 2015-02-06 Outil à rouler les filets

Publications (1)

Publication Number Publication Date
US20160354834A1 true US20160354834A1 (en) 2016-12-08

Family

ID=52630154

Family Applications (1)

Application Number Title Priority Date Filing Date
US15/117,763 Abandoned US20160354834A1 (en) 2014-02-12 2015-02-06 Thread rolling tool

Country Status (4)

Country Link
US (1) US20160354834A1 (fr)
JP (1) JP2017505233A (fr)
DE (2) DE102014202579A1 (fr)
WO (1) WO2015120840A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112139411A (zh) * 2020-09-02 2020-12-29 西安交通大学 一种建筑用钢筋端头螺纹滚轧机构
US10913103B2 (en) * 2015-06-10 2021-02-09 Jun Zhou Method, module, and apparatus for roll-processing external pipe thread, and external pipe thread production line
CN113732217A (zh) * 2021-09-07 2021-12-03 泰源工程集团股份有限公司 一种用于滚丝机的钢筋进给定位导向装置
CN113996874A (zh) * 2021-12-03 2022-02-01 中机生产力促进中心 Rpv主螺栓外螺纹三轴滚压加工参数获取方法
US11273483B2 (en) * 2016-12-13 2022-03-15 Shanghai Pan-China Fastening System Co., Ltd. Threading method, rolling head, apparatus, module and production line for pipe thread, and products thereof

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110788421B (zh) * 2019-11-26 2020-10-09 义乌市研创工业设计有限公司 一种外六角螺丝自动加工螺纹装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050210943A1 (en) * 2004-03-23 2005-09-29 C.J. Winter Machine Technologies, Inc. Thread rolling attachment
US20150165512A1 (en) * 2013-12-17 2015-06-18 Lmt Fette Werkzeugtechnik Gmbh & Co. Kg Thread rolling head
US20160136721A1 (en) * 2013-03-31 2016-05-19 Shanghai Pan-China Fastening System Co., Ltd. Method for rolling external pipe threads, rolling head and device thereof

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US2150815A (en) * 1937-09-30 1939-03-14 Berger Kornel Screw-threaded stock and manufacture of same
DE733415C (de) * 1938-10-26 1943-03-26 Albert Roller Gewindewalzkluppe fuer insbesondere duennwandige Rohre mit Leitvorrichtung
US2349862A (en) * 1942-07-29 1944-05-30 Chase Brass & Copper Co Thread-rolling tool
DE1061728B (de) * 1955-06-11 1959-07-23 Wilhelm Fette Praez Swerkzeug Selbstaufspringender Gewindewalzkopf
US4942752A (en) * 1985-09-19 1990-07-24 Sheldon Helfman Apparatus for reforming and restoring the surface of a cylindrical workpiece manually
JPH0716748B2 (ja) * 1986-07-10 1995-03-01 レツキス工業株式会社 管材用テ−パねじ転造法
JPH0347707Y2 (fr) * 1989-06-26 1991-10-11
JPH09327742A (ja) * 1996-06-12 1997-12-22 Retsukisu Kogyo Kk 管用テーパーねじ転造用ヘッド
CN1461679A (zh) * 2002-05-29 2003-12-17 林营林 手摇、电动无切削锥管螺纹机
DE102008019437A1 (de) * 2008-04-17 2009-10-22 Gottfried Wilhelm Leibniz Universität Hannover Vorrichtung und spanloses Umformungsverfahren zum Einbringen eines Außenprofils in ein Werkstück
DE102012004701A1 (de) 2012-03-12 2013-09-12 SilberTool GmbH Vorrichtung zum Einbringen eines Gewindes

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050210943A1 (en) * 2004-03-23 2005-09-29 C.J. Winter Machine Technologies, Inc. Thread rolling attachment
US20160136721A1 (en) * 2013-03-31 2016-05-19 Shanghai Pan-China Fastening System Co., Ltd. Method for rolling external pipe threads, rolling head and device thereof
US20150165512A1 (en) * 2013-12-17 2015-06-18 Lmt Fette Werkzeugtechnik Gmbh & Co. Kg Thread rolling head

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10913103B2 (en) * 2015-06-10 2021-02-09 Jun Zhou Method, module, and apparatus for roll-processing external pipe thread, and external pipe thread production line
US11273483B2 (en) * 2016-12-13 2022-03-15 Shanghai Pan-China Fastening System Co., Ltd. Threading method, rolling head, apparatus, module and production line for pipe thread, and products thereof
CN112139411A (zh) * 2020-09-02 2020-12-29 西安交通大学 一种建筑用钢筋端头螺纹滚轧机构
CN113732217A (zh) * 2021-09-07 2021-12-03 泰源工程集团股份有限公司 一种用于滚丝机的钢筋进给定位导向装置
CN113996874A (zh) * 2021-12-03 2022-02-01 中机生产力促进中心 Rpv主螺栓外螺纹三轴滚压加工参数获取方法

Also Published As

Publication number Publication date
DE102014202579A1 (de) 2015-08-13
JP2017505233A (ja) 2017-02-16
DE112015000760A5 (de) 2016-11-10
WO2015120840A1 (fr) 2015-08-20

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Legal Events

Date Code Title Description
AS Assignment

Owner name: ROTHENBERGER AG, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SILBERKUHL, PHILIPP;REEL/FRAME:039708/0400

Effective date: 20160727

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION