EP0225262B1 - Formgebung von schraubenförmigen Gewinden mit Null- oder negativer Seiteninklination - Google Patents

Formgebung von schraubenförmigen Gewinden mit Null- oder negativer Seiteninklination Download PDF

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Publication number
EP0225262B1
EP0225262B1 EP86420265A EP86420265A EP0225262B1 EP 0225262 B1 EP0225262 B1 EP 0225262B1 EP 86420265 A EP86420265 A EP 86420265A EP 86420265 A EP86420265 A EP 86420265A EP 0225262 B1 EP0225262 B1 EP 0225262B1
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EP
European Patent Office
Prior art keywords
thread
flank
roller
inclination
process according
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.)
Expired - Lifetime
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EP86420265A
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English (en)
French (fr)
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EP0225262A1 (de
Inventor
Charles Marcon
Jean Poullain
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Escofier Technologie Sa SA
Escofier Technologie SAS
Original Assignee
Escofier Technologie Sa SA
Escofier Technologie SAS
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Application filed by Escofier Technologie Sa SA, Escofier Technologie SAS filed Critical Escofier Technologie Sa SA
Priority to AT86420265T priority Critical patent/ATE57116T1/de
Publication of EP0225262A1 publication Critical patent/EP0225262A1/de
Application granted granted Critical
Publication of EP0225262B1 publication Critical patent/EP0225262B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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

Definitions

  • the process which is the subject of the invention relates to the production of helical threads of which at least one of the sides has a zero or negative inclination on solid or hollow bodies of revolution.
  • hollow bodies it relates to the production of threads on the exterior or interior walls. It most often relates to the production of end threads on metal tubes which are assembled by screwing.
  • the method applies not only to the production of cylindrical helical threads but also conical threads. (see FR-A-1 362 818).
  • Figure 1 shows in axial half-section a body of revolution (1) of axis XI-XI on the outer wall of which have been traced a few threads of a helical thread (2).
  • the two opposite flanks of the thread such as (3, 4) are flanks which are said to have a positive inclination.
  • these flanks arranged in V relative to each other meet at the bottom of the thread in (6). If we pass through this point (6) a radius of the body of revolution (5) we see that if we travel this radius from point (6) towards the outside of the thread, i.e. in the direction of the arrow, we move away from the sides (3) and (4).
  • these sides are said to have a positive inclination. Note that the same definition applies to a thread formed on the inner wall of a hollow body of revolution.
  • FIG. 2 If the threads shown in FIG. 1 are cut by a plane P1 perpendicular to a tangent to the helix of the thread (2) and passing through the intersection (6) of the spoke (5) with the bottom of the thread, the radius ( 5) therefore being contained in this plane, FIG. 2 is obtained.
  • This plane (P1) intersects the sides of the net considered in (7) and (8) along their generatrices.
  • These generatrices are, in the case of FIG. 2, straight lines but can have various shapes depending on the types of threads. Also it is necessary to consider the angles of inclination of the flanks of the net such as (7) or (8) at any points of their generatrices such as (M) or (N). At each of these points the angle of inclination of the generator is the angle formed by a tangent thereto at this point with a parallel to the radius (5) passing through this point.
  • angles (a) and ( ⁇ ) are positive because by moving parallel to the radius (5) contained in the cutting plane, starting, respectively, from point (M) or point (N) towards the outside of the thread, that is to say in the direction of the arrows carried at the ends of the straight lines (5 ') and (5 "), we deviate from the tangents to the generatrices plotted sn these points.
  • Helical threads with positive side threads are the most used because they are the easiest to produce. This is the case, for example, for threads conforming to the international S.I. system, the opposite sides of which each have a positive inclination of 30 ° with respect to a radius.
  • connection breakage exists for example in the case of pipes comprising tubes of large diameter and small thickness which support high tensile forces.
  • FIG. 3 The cutting planes (P2), (P3) are, as in the case of FIG. 2, planes perpendicular respectively to a tangent to the helix of the corresponding thread (9), (10) and containing the radius (13), (14) of the body of revolution which intersects in (11), (12) the bottom of the thread.
  • the generatrices of the flank sides (15, 16) are straight and parallel to the radius (13). The tangents at any point of these generatrices therefore merge with them, and are therefore also parallel to the radius (13).
  • the generatrices (17) and (18) of the flanks of the threads are rectilinear and therefore merge with their tangents. If we pass through any point (P) of the generator (17) a parallel (14 ') to the radius (14) it makes with the generator (17) an angle (a1); this angle is positive and therefore the thread flank corresponding to a positive angle inclination (a1). On the other hand, a parallel (14 ") to the radius (14) passing through any point (S) of the generator (18) makes a negative angle (j31) with it. Indeed if we cross the line (14") from point (S) towards the outside of the thread, i.e.
  • This flank of the thread therefore has a negative angle inclination (131). It is often said that it is a side of the net with an undercut.
  • the process for producing, on the external wall of bodies of revolution, and also in the case of hollow bodies of revolution on the internal wall, helical threads comprising a side with zero or negative inclination which is the subject of the invention , consists in carrying out, in a first phase, by a method such as machining, rolling or other, a helical thread whose opposite flanks of each thread both have a positive inclination and in a second phase , is carried out, by means of a forming, on the side of the net that will be loaded in use, a plastic deformation without removal of material during which the said side is driven decreasingly from the base to the top in order to obtain a zero or negative tilt.
  • the forming means used is preferably a roller of revolution mounted freely in rotation on an axis inclined by an angle between 10 ° and 80 ° relative to a plane perpendicular to a radius of the body of revolution, which radius intersects the bottom of the thread in the vicinity of the bearing zone of the roller on the side of the thread.
  • the generator of the edge of the roller which is in abutment against the flank of the thread, makes with an angle between 0 and -30 ° with this same radius of the body of revolution.
  • the axis of the roller is in a plane perpendicular to a tangent to the helix of the thread, in the bearing zone of the roller on the side of the thread.
  • the generator of the edge of the roller which causes the plastic deformation of the side of the thread is connected with a second forming zone whose generator is in abutment on the outer edge of the thread.
  • these two generators make an angle between them of about 50 to 100 °. It is thus possible to control the profile of the bead which tends to form by plastic deformation at the outer edge of the thread during the forming of the thread flank by the roller. You can also control the profile of this bead, or eliminate it by any suitable method such as lathe machining, milling with another.
  • the end edge of the roller is given a rounded profile and there is exerted on this roller, by means of the axis on which it is mounted free in rotation, sufficient thrust so that the profile of this edge d he end is reproduced in the connection zone between the thread end and the side whose inclination has been transformed.
  • Fig. 5 Hollow body on which a thread is produced according to the first phase of the process according to the invention.
  • Fig. 6 Hollow body on which the second phase of the process according to the invention is carried out.
  • Fig. 7 Variant of execution of the second phase of the method according to the invention using a roller allowing the control of the outer edge of the net.
  • Figures 5 and 6 show an embodiment of the method according to the invention in the case of the realization, on the outer wall of a hollow body of revolution (19), a thread having a side capable of being loaded , with negative tilt.
  • This hollow body is made of a material capable of being plastically deformed, such as a metallic material.
  • a thread In a first phase, or produces by a suitable process, such as lathe machining, a thread, a section of which is shown in FIG. 5.
  • the cutting plane is, as in the case of FIGS. 2 to 4, perpendicular to a tangent to the helix at the bottom of the thread at (20), at the intersection of the bottom of the thread with the radius (21).
  • the point (22) is itself at the intersection of the axis of the hollow body (19) with the section plane, this axis and this plane forming between them an angle equal to the angle of propeller.
  • the opposite flanks (23, 24) of the threads have a positive inclination and are therefore easy to produce.
  • the generator (24) of the side intended to be loaded in use has an actual angle of inclination (p2) relative to a parallel (21 ") to the radius (21) which passes through the foot of this generator, bottom of the net.
  • This angle (p2) is positive. It is the same for the generator (23) of the opposite flank which makes a positive angle (a2) with a parallel (21 ') to the radius (21), which passes through the foot of this generator.
  • a roller (26) is made to roll against the generatrix of the flank intended to be loaded by exerting sufficient pressure to deform this flank and give it an undercut, that is to say ie a negative tilt.
  • the roller (26) is mounted free in rotation on an axis (X2-X2) which is in the plane of the figure, which is perpendicular to the tangent to the propeller at the bottom of the thread at point (27) of intersection of this bottom of the net by the radius (25).
  • this axis (X2-X2) is inclined at an angle (6) relative to a plane perpendicular to this radius, the trace of which is shown in (28).
  • One of the objects of the invention is the structure and the particular characteristics of the rollers used for implementing the method according to the invention.
  • this roller (26) has a frustoconical wall whose generator (29) is inclined so as to push back the sidewall (24) decreasingly from the base to the top, giving it a negative inclination.
  • the negative angle (p3) made by the generator (29) relative to a parallel (25 ') to the radius (25), which passes through the foot of this generator, is that which is imparted to the loaded side after passage of the roller .
  • the axis (X2-X2) of the roller (26) is carried by a suitable means which makes it possible, relatively, to perform a double synchronized movement of rotation around the body (19) and of translation parallel to the axis of this body, so that the generator (29) uniformly pushes the sidewall (24) at (32) giving it the desired negative inclination.
  • the end edge (30) of the roller is rounded so as to connect the thread end to the modified side (32).
  • a bead (31) is formed on the outer edge of the net. This bead must most often be then removed by any means, such as lathe machining or milling.
  • the angle (p2) of positive inclination, given by machining to the flank (24), then the angle of negative inclination (p3), given to this same flank in (32) by the generator (29) of the roller ( 26), are determined according to the characteristics of the material which constitutes the body of revolution. Most often, the angle (B2) is about 1 to 20 ° and the angle ( ⁇ 3) is about 0 to 30 °.
  • the angle of inclination 8 of the roller axis is between 10 and 80 ° and, most often, between 30 and 60 °. It is determined according to the characteristics of the thread that it is a question of working, so as to produce a roller whose profile is such that it can penetrate to the bottom of the thread, while having sufficient compactness to withstand the forces which imposed on him.
  • FIG. 7 shows a roller of revolution (33) mounted freely in rotation on an axis X3-X3, used to give a negative inclination to the flank loaded with a thread (34) produced on the outer wall of a hollow body of revolution (35).
  • This roller comprises a first forming zone, substantially frustoconical, the generator (36) of which is inclined so as to push back the sidewall (37) of net giving it a negative angle inclination (p4).
  • the plane of Figure 7 contains the radius (38) of the body of revolution (35) which intersects the bottom of the thread at (39). This plane is perpendicular to the tangent to the helix of the thread at the bottom of the thread passing through this point of intersection (39).
  • the axis X3-X3 is inclined at an angle (81) relative to a plane perpendicular to the radius (38), the plane of which the trace is shown in (40).
  • the roller has a second zone of forming, substantially frustoconical, whose generator (41) is connected to the generator (36). It is noted that these two substantially frustoconical zones are opposed by their small base thus forming an annular groove of substantially triangular section.
  • the second generator (41) is oriented so as to give the outside edge of the net the desired profile.
  • the pressure it exerts on this edge makes it possible to equalize the bead which tends to form by plastic displacement of the metal under the action of the first generator of the roller on the side of the thread.
  • This bead is thus given the form of an extra thickness (42) regularly distributed over the outer edge of the net. This regularity of distribution generally makes it possible to avoid subsequent machining.
  • the generators such as (36) and (41) are substantially rectilinear and form an angle between them of about 50 to 90 °.
  • the two phases which make it possible to carry out the process according to the invention can be carried out consecutively by means of integrated equipment, or on the contrary be carried out by means of different equipment operating in the same place or in different places.
  • the method can be applied to threads of standardized types having flanks with positive inclination produced on current industrial products, which will be modified during the execution of the second phase of the method according to the invention.
  • the method applies not only to the execution of cylindrical threads, such as those described in the examples, but also to the execution of conical threads. It applies in particular to the production of cylindrical or conical threads of ends on tubes, in particular on tubes relatively thin compared to their diameter, said threads being intended to participate in the junction of these tubes.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Turning (AREA)
  • Braiding, Manufacturing Of Bobbin-Net Or Lace, And Manufacturing Of Nets By Knotting (AREA)
  • Transmission Devices (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Suspension Of Electric Lines Or Cables (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Chemical Treatment Of Metals (AREA)

Claims (9)

1. Verfahren zur Formgebung auf der Seitenwand eines Drehkörpers eines schraubenförmigen Außen- oder Innengewindes mit einer Flanke mit Null- oder negativer Inklination bzw. Steigung, dadurch gekennzeichnet, daß in einer ersten Phase durch ein Verfahren, wie spanende Formgebung, Rollformen oder dgl., ein Gewinde erzeugt wird, dessen Flanken eines jeden Gewindegangs (23, 24) positive Inklination aufweisen, sodann, daß in einer zweiten Phase unter Anwendung einer Formeinrichtung eine plastische Verformung ohne Wegnahme von Material von der Flanke des Gewindegangs (24) erzeugt wird, die bei Verwendung beaufschlagt wird, eine plastische Verformung, während der diese Flanke auf abnehmende Weise von der Basis zur Spitze zurückgeworfen wird, um eine Null- oder negative Neigung (32) zu erhalten.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Verformungseinrichtung eine Drehwalze (26) ist, die frei drehbar auf einer Achse (X2-X2) ist, die um einen Winkel zwischen 10 und 80° bezüglich einer Ebene (28) senkrecht zu einem Radius (25) des Drehkörpers (19) geneigt ist, wobei der genannte Radius den Boden des Gewindegangs in der Nähe der Andruckzone der Drehwalze auf der Flanke des Gewindegangs (24) schneidet, und daß die Achse der Drehwalze eine Relativbewegung in Schraubenform um den Drehkörper ausübt, während der der Rand der Drehwalze in Andruck auf die Flanke des Gewindegangs mit der für die Verformung dieser Flanke auf vorbestimmte Art notwendigen Kraft gehalten wird.
3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß die Erzeugende (29) des Randes der Drehwalze, die in Andruck gegen die Flanke des Gewindegangs (24) steht, mit einer Parallelen zum Radius (25) des Drehkörpers einen Winkel (ß3) zwischen 0 und -30° einschließt, und daß die Achse der Drehwalze sich in einer Ebene senkrecht zu einer Tangente an die Schraube des Gewindes in einer Andruckzone der Drehwalze auf die Flanke des Gewindegangs befindet.
4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das Profil des Wulstes, der dazu neigt, sich auf dem Außenrand des Gewindegangs zu bilden, von dem eine Flanke sich in plastischer Verformung befindet, mittels einer Drehwalze (33) gesteuert wird, die zwei Bildungszonen aufweist, deren zugehörige Erzeugenden in Andruck, die eine (36) gegen die Flanke des zu verformenden Gewindegangs und die andere (41) gegen den Außenrand desselben Gewindeganges, stehen.
5. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das Entfernen des äußeren Wulstes (31), der auf dem Rand des Gewindegangs gebildet wurde, während der zweiten Phase mittels einer geeigneten Einrichtung, wie einer Bearbeitung auf der Drehbank, einem Fräsen oder dgl., durchgeführt wird.
6. Verfahren nach einem der Ansprüche 2 bis 4, dadurch gekennzeichnet, daß der Endrand (30) der Drehwalze ein abgerundetes Profil aufweist, das während der zweiten Phase in der Verbindungszone zwischen dem Boden des Gewindegangs und der Flanke, gegen den die Drehwalze in Andruck steht, reproduziert wird.
7. Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß man der Flanke des Gewindegangs (24), die in Verwendung beaufschlagt wird, eine positive Neigung von 1 bis 20° in der ersten Phase und eine Neigung von Null oder negativ von 0 bis 30° in der zweiten Phase verleiht, und daß der Neigungswinkel der Achse der Drehwalze zwischen 30 und 60° liegt.
8. Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß das schraubenförmige Gewinde konisch ist.
9. Verwendung des Verfahrens nach einem der Ansprüche 1 bis 8 bei der Herstellung von zylindrischen oder konischen Endgewinden auf Rohren, wobei die genannten Gewinde dazu bestimmt sind, bei der Verbindung von Rohren teilzunehmen.
EP86420265A 1985-10-28 1986-10-27 Formgebung von schraubenförmigen Gewinden mit Null- oder negativer Seiteninklination Expired - Lifetime EP0225262B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86420265T ATE57116T1 (de) 1985-10-28 1986-10-27 Formgebung von schraubenfoermigen gewinden mit null- oder negativer seiteninklination.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8516324A FR2589092B1 (fr) 1985-10-28 1985-10-28 Procede de formage de filets helicoidaux a flanc d'inclinaison nulle ou negative
FR8516324 1985-10-28

Publications (2)

Publication Number Publication Date
EP0225262A1 EP0225262A1 (de) 1987-06-10
EP0225262B1 true EP0225262B1 (de) 1990-10-03

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EP86420265A Expired - Lifetime EP0225262B1 (de) 1985-10-28 1986-10-27 Formgebung von schraubenförmigen Gewinden mit Null- oder negativer Seiteninklination

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US (1) US4799372A (de)
EP (1) EP0225262B1 (de)
JP (1) JPS62104640A (de)
AT (1) ATE57116T1 (de)
DE (1) DE3674737D1 (de)
FR (1) FR2589092B1 (de)

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US8414588B2 (en) * 2007-10-04 2013-04-09 Depuy Spine, Inc. Methods and devices for minimally invasive spinal connection element delivery
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US9186187B2 (en) 2011-07-15 2015-11-17 Globus Medical, Inc. Orthopedic fixation devices and methods of installation thereof
US8888827B2 (en) 2011-07-15 2014-11-18 Globus Medical, Inc. Orthopedic fixation devices and methods of installation thereof
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US9993269B2 (en) 2011-07-15 2018-06-12 Globus Medical, Inc. Orthopedic fixation devices and methods of installation thereof
US9358047B2 (en) 2011-07-15 2016-06-07 Globus Medical, Inc. Orthopedic fixation devices and methods of installation thereof
US9132021B2 (en) * 2011-10-07 2015-09-15 Pioneer Surgical Technology, Inc. Intervertebral implant
US11147682B2 (en) 2017-09-08 2021-10-19 Pioneer Surgical Technology, Inc. Intervertebral implants, instruments, and methods
USD907771S1 (en) 2017-10-09 2021-01-12 Pioneer Surgical Technology, Inc. Intervertebral implant
CA3113361A1 (en) * 2020-03-26 2021-09-26 NejiLaw inc. Oil well pipe connection structure and oil well pipe
CN113732414B (zh) * 2021-09-30 2022-08-16 广州市金峰机械科技有限公司 一种应用于工件盖全自动攻牙的攻牙机
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Also Published As

Publication number Publication date
ATE57116T1 (de) 1990-10-15
FR2589092B1 (fr) 1987-11-13
EP0225262A1 (de) 1987-06-10
JPS62104640A (ja) 1987-05-15
FR2589092A1 (fr) 1987-04-30
US4799372A (en) 1989-01-24
DE3674737D1 (de) 1990-11-08

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