US20120186318A1 - Device for rolling threads - Google Patents

Device for rolling threads Download PDF

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Publication number
US20120186318A1
US20120186318A1 US13/393,499 US201113393499A US2012186318A1 US 20120186318 A1 US20120186318 A1 US 20120186318A1 US 201113393499 A US201113393499 A US 201113393499A US 2012186318 A1 US2012186318 A1 US 2012186318A1
Authority
US
United States
Prior art keywords
workpiece
screwthread
profiling tool
tool
brace block
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
US13/393,499
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English (en)
Inventor
Bernd-Arno Behrens
Hagen Schmidt
Philipp Silberkuhl
Dietmar Schnier
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.)
Leibniz Universitaet Hannover
Original Assignee
Leibniz Universitaet Hannover
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 Leibniz Universitaet Hannover filed Critical Leibniz Universitaet Hannover
Assigned to GOTTFRIED WILHELM LEIBNIZ UNIVERSITAET HANNOVER reassignment GOTTFRIED WILHELM LEIBNIZ UNIVERSITAET HANNOVER ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SCHNIER, DIETMAR, BEHRENS, BERND-ARNO, SCHMIDT, HAGEN, SILBERKUHL, PHILIPP
Publication of US20120186318A1 publication Critical patent/US20120186318A1/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
    • 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 apparatus for forming a screwthread in a workpiece having a cylindrical outer surface by screwthread rolling, comprising a profiling tool with a pitchless profile and having in particular a rotation axis oblique to an axis of the workpiece.
  • screwthread rolling refers in general to the noncutting production of a screwthread by cold working in which the profile is rolled into the surface of the corresponding tube section. According to DIN 8580, screwthread rolling falls under working, more specifically, compressive working, and within this, under rolling. Working is based on generating compressive stresses by means of one or more forming tools in the workpiece. This method is significantly faster and more cost-effective with high-volume production runs than are other methods for producing screwthreads—specifically, screwthread cutting.
  • the pair of jaws has the counter-profile with the pitch angle of the screwthread, one jaw being fixed while the other is movable.
  • the workpiece is rolled along under the action of friction so as to create the screwthread around the entire circumference of the screwthread.
  • the rolling jaws have sloped entry and exit sides, as well as a straight calibration section.
  • Screwthread rolling with circular tools can be performed using the infeed or throughfeed method. Either short or long screwthreads can be rolled even up to the head.
  • the rollers In the infeed method, the rollers have a corresponding screwthread profile with the same pitch angle, however, with the opposite direction of twist.
  • the workpiece is held either by a straightedge (centerless) or between centers. During the rolling procedure, the workpiece does not move axially except for slight compensating movements. Since the ratio of roller diameter to workpiece diameter and the number of starts must matched precisely to each other, a pair of rollers can be employed only for a very specific screwthread.
  • the rollers In the throughfeed method, the rollers have adjacent pitchless screwthread profiles. They are pivoted about their horizontal longitudinal axis to the required pitch angle. As a result, the axial feed of the workpiece is generated by the amount of the pitch during one revolution. To a limited degree, the rollers can also be employed for different workpiece diameters. However, this method results in reduced pitch accuracy as compared with the infeed method.
  • Self-opening screwthread rolling heads typically have three rollers. They are moved axially onto the workpiece and pull themselves automatically onto the workpiece through the oblique orientation of the rollers. Once the intended screwthread length has been reached, the roller head opens automatically and can be retracted.
  • the object of this invention is to create an apparatus for rolling external screwthreads that has maximum portability and is relatively simple to operate manually, while also being of simple design and small outside dimensions.
  • the profiling tool is a circular disk ( 9 ) that is rotatably supported about its rotation axis and that has two annular, coaxial pitchless profiles projecting from an outer periphery of the disk and together defining an annular groove whose shape and dimensions correspond to the screwthread profile of the screwthread to be created.
  • the invention relates to an apparatus for rolling screwthread in which a workpiece is secured between rolling tool and clamping apparatus, and is clamped in place by a screw feed. After locking in place is completed, a screwthread can now be rolled into the workpiece by rotation by hand.
  • the screwthread geometry of the workpiece is defined here by the rolling tool.
  • the rolling tool preferably has a quick-change insert and as a result can within limits produce any desired external screwthread.
  • an apparatus of this type is sufficiently compact that it can be carried and operated by hand. It does not require an electrical drive; instead, forces can be generated by muscle power. Workpieces do not need to be moved to the screwthread-rolling apparatus; instead, the apparatus can be easily carried to the location where the screwthread is to be created.
  • the solution according to the invention enables the work-hardening of the material due to the rolling procedure being used.
  • a combination of the working process in the form of screwthread rolling, together with the sizing and material selection of the feed adjustment apparatus enable a standardized screwthread to be produced on a workpiece.
  • cut screwthreads in the case of an axial “plain-bearing feed” here would be negatively affected to a relatively greater degree.
  • the geometry and, depending on the material, the stresses on the workpiece are thus minimized.
  • a more secure hold together with the simplest production is provided if the cylindrical workpiece is held in a part-cylindrical groove of a brace block, the longitudinal axis of which extend obliquely to the rotation axis of the profiling tool.
  • the brace block here can be adjustable, in particular by hand, transversely, and in particular, perpendicular to the rotation axis of the profiling tool.
  • An advantageous alternative brace block for the workpiece is provided when the inside wall of the part-cylindrical groove includes a partial screwthread formation that essentially corresponds in shape and pitch to the screwthread to be created on the workpiece.
  • cylindrical workpiece is supported on the side opposite the profiling tool by at least two rollers that are axially parallel to the workpiece and that are mounted in a brace block.
  • brace block can be operated by a threaded rod, in particular by hand, in order to adjust the spacing between the profiling tool and the brace block.
  • an approach is proposed whereby the workpiece is able to be axially and/or radially insertable into and removable from the intermediate space between the profiling tool and the brace block.
  • An especially advantageous aspect is that the screwthread-rolling apparatus as a hand tool is able to be operated by hand and is portable.
  • FIG. 1 shows a first embodiment in which the workpiece is held against the profiling tool in a groove of a brace block
  • FIG. 2 shows a second embodiment in which the workpiece is held against the profiling tool by two rollers
  • FIG. 3 shows an embodiment comprising a closed annular frame.
  • the screwthread-rolling apparatus 1 has a U-shaped frame 2 formed by a base 3 from which two arms 4 and 5 extend.
  • the inner arm 4 has two arm halves 4 a and 4 b that form with a longitudinal slot 6 in which a profiling tool 7 is supported for rotation on a pivot 8 whose ends pass through both arm halves 4 a and 4 b so as to be held by the arm 4 .
  • the profiling tool has circular disks 9 whose outer circularly annular, coaxial, and spaced peripheries 10 are of identical diameter and identical cross-section such that they form a coaxial annular groove 11 whose cross-section corresponds in shape and dimension to the cross-section of the profile of the screwthread to be generated.
  • the dimensions and cross-section of the peripheries 10 are selected so as to correspond to the dimensions and the cross-section of the screwthread to be created.
  • a brace block 20 provided to press the cylindrical outer surface of the rod-shaped workpiece against the profiling tool is formed with a part-cylindrical groove 12 in which the workpiece lies and whose concave surface is shaped complementary to the screwthread to be generated.
  • a threaded rod 12 [Translator's note: 13 ] supported on brace block 20 on the side opposite groove 12 is engaged in a complementary threaded hole of the outer arm 5 and can be rotated by hand about its longitudinal axis by a grip 14 at the rod's outer end so as to move the brace block 20 toward and away from the profiling tool.
  • the profiling tool 7 can also be supported in the block 20 while the inner arm 4 creates the counter-support and has the groove 12 .
  • the brace block 20 can as shown in FIG. 2 hold two guide wheels or guide rollers 21 that engage with profiled formations in the screwthread of the workpiece.
  • the surfaces of the rollers 21 can be cylindrical and smooth, in particular when the screwthread is being repaired.
  • the frame 2 it is also possible for the frame 2 to be closed rather than U-shaped, i.e. the two arms 4 , 5 are over-pressed [Translator's note: bridged] by a top piece 2 a such that the frame 2 is annular, with the brace block 20 located within its central opening as shown in FIG. 3 .
  • the pivot 8 of the disk 9 and thus of the two profiles 10 as well, defines an axis that is oblique to the axis of the groove 12 , or relative to the guide edges 21 so as to enable a screwthread with a continuous screwthread turn, rather than simply annular grooves, to be created in the workpiece.
  • the angle of this oblique orientation measures 0.4° to 10°.
  • the oblique orientation can be eliminated for the purpose of repairing a damaged screwthread, i.e., then the guide, in particular, the groove 12 in the brace block or guide piece 20 is parallel to the rotation axis 8 of the profiling tool.
  • the advantage of using the tool according to the invention without a machine is the fact that it is not tied to one location, can be flexibly employed, and, for example, set-up times are eliminated.
  • the tool is thus appropriate for producing small quantities and is also significantly more cost-effective to produce than, for example a rolling head, since it is composed of a few simple parts.
  • the profile rollers have either a profile with pitch or a profile without pitch in the form of circular circumferential ribs or rings.
  • a pitchless profile is also employed in this invention for forming; however, this profile is distinguished by the fact that it has only two circumferential ribs or rings that form an annular intermediate groove between them, which groove approximately corresponds to the screwthread profile to be shaped. Although it could in fact also have multiple rings, nevertheless when used only two engage the workpiece.
  • the workpiece is supported by a brace element on the side opposite the profile roller.
  • This can be, for example in the form of a solid body having a negative profile matched to the screwthread.
  • a relevant factor for the brace element is that it transmit the force to the workpiece with the most extensive possible contact, not contact at intermittent points.
  • An advantageous embodiment of the tool resembles that of a pipe cutter, which differs from the above-described invention in that a level-oriented cutter wheel is employed instead of a profile roller that is oriented obliquely and imparts a profile.
  • the proposed embodiment of the tool is distinguished by the fact it is designed as a mobile portable hand tool.
  • the profiling tool and the brace element here are able to be tangentially feed-adjusted relative to each other. At least one rest position can be set here at which a workpiece can be inserted between the profiling tool and the brace element.
  • the ability to allow the workpiece to be inserted both axially as well as tangentially provides the greatest possible flexibility.
  • the tool can form screwthreads not only at the end of a workpiece but at any point desired.
  • a critical factor is that the profiling tool and the brace element lie in one force flow plane so that no bending or tilting moments are produced by a locking action on the workpiece to be worked.
  • the tool is designed here such that the profiling tool is oriented obliquely at an angle relative to the workpiece axis, which angle approximately corresponds to the screwthread pitch.
  • possible feed adjustment allows the tool not only to be set at the end of the workpiece—instead, the screwthread can be rolled in a direction starting at the center of the workpiece up to the end of the workpiece. This prevents the tool from being set in an accidently skewed fashion. There is also no need to grasp the workpiece at the workpiece end—as is customary when cutting screwthread—so as to prevent a tilted or skewed application.
  • the advantageous properties of chip-free working using the apparatus according to the invention can be exploited, thereby allowing the advantages of screwthread generated by this type of method to be realized in mobile fashion by hand.
  • the external screwthread is introduced without swarf, where the screwthread geometry to be created is uniquely predefined by the profiling tool in terms of profile depth and profile shape. It is practically impossible to effect skewing or imprecise introduction of the profile. It is also impossible to effect an “excessively strong” feed adjustment since the forces increase exponentially as soon as the space between the two ribs or rings forming the profile have been completely filled in by the shaped workpiece.
  • the geometry of the workpiece here requires only an essentially cylindrical outer surface, and can also be tubular or composed of a solid material.
  • the external screwthread is formed completely up to a predefined point, thereby enabling a screwthread to be generated without runout. No electrical power supply is required here, with the result that a wide variety of possible applications is provided.
  • screwthread repair Another possible application of the tool is screwthread repair. Deformed external screwthreads can be reshaped back to the original form using the tool. Due to the oblique orientation of the profile roller, relatively major damage can be repaired significantly more effectively than with the known tools. However, as was explained above, it is also possible to perform repairs of high quality on screwthreads even when the profile rollers are not oriented obliquely, i.e. when their axis is oriented parallel to the longitudinal axis of the workpiece.
  • the profile of the profiling tool and the angle by which the profiling tool is oriented relative to the workpiece axis are dependent on the type of screwthread to be generated, it is advantageous to design parts of the tools (the forming roller and the counter-holder) so as to be easily replaceable, thereby allowing the tool to be used to generate different screwthread types. This also makes sense since the counter-holder and the profile roller are subject to wear over time and can then be replaced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Rolling Contact Bearings (AREA)
  • Transmission Devices (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
US13/393,499 2009-10-15 2011-09-02 Device for rolling threads Abandoned US20120186318A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102009049580A DE102009049580A1 (de) 2009-10-15 2009-10-15 Vorrichtung zum Gewinderollen
DE102009049580.0 2009-10-15
PCT/EP2010/005398 WO2011044970A1 (fr) 2009-10-15 2010-09-02 Dispositif pour rouler des filets

Publications (1)

Publication Number Publication Date
US20120186318A1 true US20120186318A1 (en) 2012-07-26

Family

ID=43086205

Family Applications (1)

Application Number Title Priority Date Filing Date
US13/393,499 Abandoned US20120186318A1 (en) 2009-10-15 2011-09-02 Device for rolling threads

Country Status (8)

Country Link
US (1) US20120186318A1 (fr)
EP (1) EP2488314A1 (fr)
JP (1) JP2013507256A (fr)
CN (1) CN102574195A (fr)
DE (1) DE102009049580A1 (fr)
IL (1) IL219141A0 (fr)
RU (1) RU2012119780A (fr)
WO (1) WO2011044970A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170056957A1 (en) * 2014-02-13 2017-03-02 Philipp Silberkuhl Thread rolling tool

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202015003494U1 (de) 2015-05-12 2015-08-21 Gotthard Mayr Gewindeausbesservorrichtung

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1414668A (en) * 1921-04-16 1922-05-02 Fred A Reed Knurling tool
US2701484A (en) * 1952-04-30 1955-02-08 Leo W Bedker Rolling apparatus

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE561304C (de) * 1932-10-13 Else Lorenz Geb Neustein Valzvorrichtung zur Herstellung von konischem Rohrgewinde von Hand
DE607660C (de) * 1932-05-11 1935-01-05 Else Lorenz Geb Neustein Verfahren zum unmittelbaren Walzen von Innen- und Aussenrohrgewinde, insbesondere bei Rohren aus Weichmetall
US1983922A (en) * 1932-11-22 1934-12-11 Frederick H Ruppel Pipe grooving tool
US2508291A (en) * 1945-06-09 1950-05-16 Porro Frank Rethreading tool
US2684101A (en) * 1950-04-28 1954-07-20 John W Clerke Tube-swaging and thread-rolling apparatus
DE1299270B (de) * 1964-02-03 1969-07-17 Hufnagl Vorrichtung zum Anbringen von Schraubengaengen an stab-und drahtfoermigem Material
IL84215A (en) * 1987-10-19 1990-07-12 Zeev Stahl Screw-thread repair tool
US5417095A (en) * 1993-11-08 1995-05-23 C.J. Winter Machine Works, Inc. Thread rolling attachment and method
JP4407919B2 (ja) * 2004-05-12 2010-02-03 本田技研工業株式会社 ネジの修正治具

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1414668A (en) * 1921-04-16 1922-05-02 Fred A Reed Knurling tool
US2701484A (en) * 1952-04-30 1955-02-08 Leo W Bedker Rolling apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170056957A1 (en) * 2014-02-13 2017-03-02 Philipp Silberkuhl Thread rolling tool
US10543524B2 (en) * 2014-02-13 2020-01-28 Philipp Silberkuhl Thread rolling tool

Also Published As

Publication number Publication date
JP2013507256A (ja) 2013-03-04
CN102574195A (zh) 2012-07-11
RU2012119780A (ru) 2013-11-27
DE102009049580A1 (de) 2011-04-21
EP2488314A1 (fr) 2012-08-22
IL219141A0 (en) 2012-06-28
WO2011044970A1 (fr) 2011-04-21

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AS Assignment

Owner name: GOTTFRIED WILHELM LEIBNIZ UNIVERSITAET HANNOVER, G

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BEHRENS, BERND-ARNO;SCHMIDT, HAGEN;SILBERKUHL, PHILIPP;AND OTHERS;SIGNING DATES FROM 20120308 TO 20120321;REEL/FRAME:027914/0434

STCB Information on status: application discontinuation

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