EP0069027A2 - Vorrichtung zum Befestigen einer Expansions- oder Lochbirne an einer Haltestange - Google Patents

Vorrichtung zum Befestigen einer Expansions- oder Lochbirne an einer Haltestange Download PDF

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Publication number
EP0069027A2
EP0069027A2 EP82420066A EP82420066A EP0069027A2 EP 0069027 A2 EP0069027 A2 EP 0069027A2 EP 82420066 A EP82420066 A EP 82420066A EP 82420066 A EP82420066 A EP 82420066A EP 0069027 A2 EP0069027 A2 EP 0069027A2
Authority
EP
European Patent Office
Prior art keywords
pear
tail
groove
hole
locking means
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
EP82420066A
Other languages
English (en)
French (fr)
Other versions
EP0069027B1 (de
EP0069027A3 (en
Inventor
Roland Marie
Patrick Lambay
Michel Locoge
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.)
Vallourec SA
Original Assignee
Vallourec SA
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 Vallourec SA filed Critical Vallourec SA
Priority to AT82420066T priority Critical patent/ATE15980T1/de
Publication of EP0069027A2 publication Critical patent/EP0069027A2/de
Publication of EP0069027A3 publication Critical patent/EP0069027A3/fr
Application granted granted Critical
Publication of EP0069027B1 publication Critical patent/EP0069027B1/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B25/00—Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group B21B17/00; Accessories or auxiliary means therefor ; Construction of, or alloys for, mandrels or plugs
    • B21B25/06—Interchanging mandrels, fixing plugs on mandrel rods or cooling during interchanging mandrels
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/59—Manually releaseable latch type
    • Y10T403/598—Transversely sliding pin
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/60—Biased catch or latch
    • Y10T403/602—Biased catch or latch by separate spring
    • Y10T403/604—Radially sliding catch

Definitions

  • the invention relates to the attachment, in an end housing of a reaction bar, of the tail of a drilling pear used in a piercing mill to transform a cylindrical magnifying glass into a tubular blank.
  • the invention also relates more generally to the devices for attaching pears to reaction bars for any operation relating to the working of tubes by rolling.
  • This part of the bar is embedded in a housing produced in the rear part of the piercing bulb, and an axial control rod, which extends over the entire length of the bar and is controlled from the other end, is provided with a head which spreads the balls radially and applies them against an annular groove hollowed out in the housing.
  • Such a device which comprises a relatively complex control mechanism, entirely housed inside the reaction bar, and which extends over its entire length, considerably increases the cost of the latter.
  • the reaction bar must be used not only as support for the pear for drilling the blank, but also, as described in FR 2,198,797, as a mandrel for rolling the blank.
  • the same assembly in which the blank, which has become thinned and elongated tube, still surrounds the bar, is sent to a demandering device; the bar and the pear, always attached, are then extracted from the tube, then returned to cooling, lubrication, etc. installations before being reintroduced into the axis of the piercer.
  • the time interval separating the rolling of two consecutive drafts can usually be of the order of a dozen seconds or a little more.
  • the length of the reaction bars is calculated according to the length of the drilling bench output bench; for reasons of mechanical bulk, the bars are generally longer than the longest drilled blank, about 2 meters. For example, for a maximum length of pre-drilled blank of 10 m, which is already considerable and corresponds to 30 m tubes after passing through the continuous rolling mill, the length of the bars holding the drilling pears will be approximately 12 m.
  • a given bar diameter may therefore be suitable for producing drilled blanks having a whole range of different internal diameters.
  • bars are most often tubular and made of conventional structural steel.
  • the length of the bar depends on the maximum length of the laminated tube; for the above-mentioned lengths of drilled blank and laminated tube, the bar reaches a length of 17 meters.
  • tubular bars are in principle possible, but, for reasons of mechanical strength, their internal diameter must be very small.
  • such a device must allow the replacement of a damaged piercing bulb with another in a space of the order of about a dozen seconds, without using any particular tool. It must also be able to be applied to long bars, most often full, and therefore must not require control means arranged in an axial housing from one end to the other of the bar.
  • the new device which is the subject of the invention has all the desired characteristics, and makes it possible to provide the problem thus posed with a particularly simple and effective solution.
  • a housing of axial symmetry produced at at least one of the ends of the reaction bar, into which the tail of the piercing bulb can be introduced, an annular groove produced at the periphery of the tail of the piercing bulb, a hole which passes through the wall of the reaction bar and opens into the axial housing, opposite the groove, when the tail is inserted into the housing, a locking means which can be introduced into the hole so that its front end exceeds the bottom of the hole and enters the groove, and a retaining means which is introduced into the hole behind the locking means so as to hold the latter in place.
  • FIG. 1 represents a rotary drilling pear (1) which comprises a cylindrical tail (2) inserted in a cylindrical housing (3) open at the end of a bar (4).
  • the tail (1) has an annular groove (5) and the wall of the bar is pierced with a smooth hole (6) which opens out opposite the place where the throat must be when the tail of the pear is pressed fully into the housing.
  • a locking means constituted by a steel bolt (7) whose cylindrical head (9) has an outside diameter smaller than the inside diameter of the hole (6), so that it there is a clearance between the bolt and the hole, and a retaining means constituted by a split annular ring (8) of high elastic limit steel whose outside diameter is in the absence of mechanical stress greater than the inside diameter of the hole ( 6).
  • the lock (7) is introduced into the hole (6) so that its front end abuts in the bottom of the groove (5).
  • the split annular ring (8) is forced into the hole (6).
  • This ring The dimensional and mechanical characteristics of this ring are calculated so that the elastic deformation to which it is subjected in order to be able to penetrate into the hole (6) results in radial stresses on the wall of the hole, such that the frictional resistance makes obstacle to the movement of the ring under the action of centrifugal forces or shocks, when the assembly is in service, thus preventing any movement of the lock (7).
  • the lock (7) as shown in Figures 1 and 2, has a cylindrical head (9) and a front part (10) which engages in the groove (5).
  • the diameter of the head (9) is less than that of the hole (6) as has just been said, but greater than the width of the groove (5).
  • the front part (10) comprises two dishes such as (11), parallel to each other and to the axis of the lock, the distance of which is less than the width of the groove (5).
  • the front part (10) has a length, measured parallel to the axis of the bolt, at least equal to the depth of the groove (5), and greater than this depth in the case of Figure 1, in order to penetrate without difficulty at the bottom of the throat.
  • the head (9) is inside the hole (6) so as to oppose the exit of the tail from its housing.
  • This head comprises a gripping means constituted by a threaded axial bore (12). It is thus possible to grip the head (9) using an extraction means such as the rod (13) which is made to penetrate into the hole (6) through the ring (8) and which comprises at its end a male thread (14) which is engaged in the threaded bore (12).
  • the dimensioning of the various parts of this device is calculated so that the clearance between the front end (10) of the latch (7) and the side walls of the groove (5) is such that no force can be transmitted to the bolt under the effect of the axial rolling reactions on the pear, even after significant wear of the pear-bar contact face.
  • the identified clearance (15) is more important than the identified clearance (16).
  • the part of the tail of the pear which is beyond the groove (5) presents with the bore of the bar a clearance (17) greater than that of the part which is below, of so that it does not participate in any way in the embedding efforts which could lead to ruptures in the throat.
  • FIG. 4 represents another embodiment of the device according to the invention.
  • a compressible thrust means constituted by a helical spring (18) is interposed between a latch (19) and a retaining ring (20).
  • a screw (21) which passes through the ring and the spring is fully screwed into the threaded bore (22) of the lock (19).
  • the head (24) of the screw is housed in the hole (6), above the ring; it has a gripping means constituted by a bore (23) for the force extraction of the bolt + spring + ring assembly, by means of an extraction means such as a hook not shown.
  • This alternative embodiment has the advantage of being able to remove the piercing bulb without having to extract the assembly constituted by the pin and the bolt: it suffices in fact, by pulling with the hook, to raise the bolt in the direction of the retaining ring, in an amount sufficient to extend its end from the groove (5) and thus release the bulb (1).
  • the invention is obviously not limited to a particular application of the piercing bulb and the preferred example of application which has been set out above is not limiting.
  • the application of the device according to the invention is not limited only to the case where the reaction bar is used for drilling the blank, but also as a mandrel for continuous rolling.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Earth Drilling (AREA)
  • Supports For Pipes And Cables (AREA)
  • Dowels (AREA)
  • Snaps, Bayonet Connections, Set Pins, And Snap Rings (AREA)
  • Automatic Assembly (AREA)
  • Insertion Pins And Rivets (AREA)
EP82420066A 1981-05-29 1982-05-26 Vorrichtung zum Befestigen einer Expansions- oder Lochbirne an einer Haltestange Expired EP0069027B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82420066T ATE15980T1 (de) 1981-05-29 1982-05-26 Vorrichtung zum befestigen einer expansionsoder lochbirne an einer haltestange.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US268175 1981-05-29
US06/268,175 US4483638A (en) 1981-05-29 1981-05-29 Device for fixing a piercing or expanding plug to a piercing or expanding bar

Publications (3)

Publication Number Publication Date
EP0069027A2 true EP0069027A2 (de) 1983-01-05
EP0069027A3 EP0069027A3 (en) 1983-02-16
EP0069027B1 EP0069027B1 (de) 1985-10-09

Family

ID=23021801

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82420066A Expired EP0069027B1 (de) 1981-05-29 1982-05-26 Vorrichtung zum Befestigen einer Expansions- oder Lochbirne an einer Haltestange

Country Status (6)

Country Link
US (1) US4483638A (de)
EP (1) EP0069027B1 (de)
JP (2) JPS57199508A (de)
AT (1) ATE15980T1 (de)
CA (1) CA1195953A (de)
DE (1) DE3266775D1 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4889356A (en) * 1989-01-12 1989-12-26 Morris Francis E Trailer hitch ball assembly
US5317894A (en) * 1993-03-12 1994-06-07 Rockford Products Corporation Quick change insert system
FR2753753B1 (fr) * 1996-09-24 1999-01-08 Systeme pour bloquer mecaniquement de maniere demontable un manchon sur un arbre d'entrainement
US6006575A (en) * 1999-03-25 1999-12-28 Usx Corporation Reversible mandrel bar assembly
TW450332U (en) * 2000-08-24 2001-08-11 Ting Chin Ind Co Ltd Foldable rod-type furniture with a mounting structure
RU2351418C2 (ru) * 2007-03-07 2009-04-10 Открытое акционерное общество "Северский трубный завод" Дорновое устройство стана периодической прокатки труб
DE102016109214B4 (de) * 2016-05-19 2020-07-02 Lisa Dräxlmaier GmbH Verriegelungselement

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1645457A (en) * 1926-09-22 1927-10-11 Myron R Schall Set-screwless collar
US1903772A (en) * 1932-06-10 1933-04-18 Newton K Bowman Core-breaker
US2220610A (en) * 1939-04-03 1940-11-05 Ellsworth S Miller Motion picture reel mounting
US2355899A (en) * 1940-12-04 1944-08-15 Pantex Pressing Machine Inc Locking setscrew
US2349341A (en) * 1942-11-13 1944-05-23 Josef A Disse Riveting device
GB649940A (en) * 1948-04-03 1951-02-07 Brown David & Sons Ltd New or improved means for transmitting longitudinal movement
US3058211A (en) * 1958-09-29 1962-10-16 Harold B Axtell Method and apparatus for securing a stud or screw
GB1129589A (en) * 1965-12-24 1968-10-09 Ti Group Services Ltd Mandrels for use in the production of tubes
US3434743A (en) * 1966-07-07 1969-03-25 Fmc Corp Well apparatus
DE6928316U (de) * 1969-07-16 1969-11-06 Porsche Kg Verriegelungsvorrichtung fuer axial verschiebbare schaltstangen von geschwindigkeitswechselgetrieben von kraftfahrzeugen.
US3762731A (en) * 1971-06-21 1973-10-02 M Matsumoto Chuck for tool
US3752515A (en) * 1971-09-15 1973-08-14 Kennametal Inc Resilient keeper ring
FR2266557B1 (de) * 1974-04-05 1977-10-14 Valti Fabr Tubes Roulements
DE2657059C3 (de) * 1976-12-14 1980-10-23 Mannesmann Ag, 4000 Duesseldorf Dornwechselvorrichtung für ein Schrägwalzwerk
US4088008A (en) * 1977-04-18 1978-05-09 American Machine & Hydraulics, Inc. Quick release adapter and tool combination
US4327947A (en) * 1980-06-17 1982-05-04 General Electric Company Keeper spring for connecting mining tool to work tool holder

Also Published As

Publication number Publication date
JPS61190301U (de) 1986-11-27
JPS57199508A (en) 1982-12-07
EP0069027B1 (de) 1985-10-09
EP0069027A3 (en) 1983-02-16
CA1195953A (fr) 1985-10-29
US4483638A (en) 1984-11-20
ATE15980T1 (de) 1985-10-15
DE3266775D1 (en) 1985-11-14

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