EP0125549B1 - Dispositif de support de noyau d'emboîtement pour moule centrifuge de tuyaux en fonte à emboîtement - Google Patents

Dispositif de support de noyau d'emboîtement pour moule centrifuge de tuyaux en fonte à emboîtement Download PDF

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Publication number
EP0125549B1
EP0125549B1 EP84104781A EP84104781A EP0125549B1 EP 0125549 B1 EP0125549 B1 EP 0125549B1 EP 84104781 A EP84104781 A EP 84104781A EP 84104781 A EP84104781 A EP 84104781A EP 0125549 B1 EP0125549 B1 EP 0125549B1
Authority
EP
European Patent Office
Prior art keywords
core
cup
yoke
bowl
jaws
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
Application number
EP84104781A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0125549A1 (fr
Inventor
Pierre Fort
Michel Pierrel
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.)
Pont a Mousson SA
Original Assignee
Pont a Mousson 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 Pont a Mousson SA filed Critical Pont a Mousson SA
Publication of EP0125549A1 publication Critical patent/EP0125549A1/fr
Application granted granted Critical
Publication of EP0125549B1 publication Critical patent/EP0125549B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D13/00—Centrifugal casting; Casting by using centrifugal force
    • B22D13/10—Accessories for centrifugal casting apparatus, e.g. moulds, linings therefor, means for feeding molten metal, cleansing moulds, removing castings
    • B22D13/101—Moulds
    • B22D13/104—Cores

Definitions

  • the present invention relates to a device for supporting an interlocking core for placing this core at one end of the metal mold or of the centrifugal casting shell of a cast iron interlocking pipe.
  • Patent FR-A-2 051 993 discloses all the characteristics of the preamble of claim 1 and 2 053 388 such a core support (also called cylinder head) mounted at the end of an articulated arm to be retractable out of the space located in front of said end of the centrifugation mold and out of the path of the molded pipe when it is extracted from the shell, that is to say when it is removed from the mold.
  • a core support also called cylinder head
  • Such a cylinder head comprises a metal bowl serving as direct support for the core of agglomerated sand, and articulated claws intended to internally grip the core of sand to introduce it into a suitable housing at the end of the shell.
  • the cylinder head contains an actuator for actuating these claws between a position for grasping the core and a retracted position.
  • the articulated levers which carry the claws are actuated by a jack.
  • the cylinder stroke must be adjusted with care to avoid too deep inlaying of the claws in the core cavity, which could cause the core to burst into sand.
  • the object of the invention is to overcome these difficulties of radial adjustment of the claws and of adjusting the stroke of the actuating cylinder of the claw support levers, with a view to eliminating the risk of the core bursting and by making a claw core support usable for all diameters and in particular for pipe interlocking cores whose drums have internal diameters greater than 150 mm.
  • the device for supporting a nesting core targeted by the invention comprises a metal bowl for supporting and holding the core in the nesting end of the shell during casting, and a cylinder head combined with said end to position the bowl and the core in the shell, said cylinder head carrying gripping means consisting of claws.
  • the bowl is mounted separable from the cylinder head and is equipped with automatic hooking members to the shell during casting.
  • the claws are distributed around the axis of the bowl and of the cylinder head, articulated around axes orthogonal to the abovementioned axis, and can be actuated by a jack carried by the cylinder head coaxially with the latter, to grip the bowl and to separate the latter from the cylinder head by retraction of said claws.
  • the device A (cylinder head assembly) illustrated in the drawings is intended to support an interlocking core 3 of agglomerated sand for a shell 1 of centrifugal casting of interlocking cast iron pipes.
  • the shell 1 is of revolution about a horizontal axis XX and is part of a casting machine B, known per se and schematically shown in Figure 1.
  • the centrifugal casting of the pipe T ( Figure 7) is carried out in a known manner , by flowing inside the shell 1 of the liquid iron, the pipes obtained having at their end an interlocking 2 of axis XX and whose configuration is determined by annular core 3 of agglomerated sand, which is arranged coxially in the interlocking end 6 of the shell 1, thanks to the support device A.
  • the latter can be moved by a handling device known per se, for example of the type described in French patent 75 18770 (publication no. 214 790).
  • the device A for supporting the core 3 is made integral with such a handling device by a ring 4 forming part of the latter.
  • the device A comprises a metal bowl 24 arranged to support and hold the core 3 in the interlocking end 6 during centrifugal casting, and a cylinder head 50 laying the core 3 forming the main part of the device A cooperating with the bowl 24 to position the latter and the core 3 in the shell 1.
  • the bowl 24 is separable from the cylinder head 50 and equipped with members 27 for automatic attachment to the shell 1 during casting, the cylinder head 50 then being separated from the bowl 24 which constitutes a detachable part of the whole of the cylinder head, that is to say of the device A (50 + 24).
  • the device A for supporting a core 3 comprises means for gripping the core 3 by a removable connection between the bowl 24 and the cylinder head 50.
  • these gripping and connecting means comprise claws 20 distributed around the axis XX of the bowl 24 and the cylinder head 50, six in number in the example described (FIG. 6) and articulated at 21 around axes ZZ 'orthogonal to the axis XX of the support device A and of the shell 1.
  • the claws 20, which are separated by equal angular intervals, can be actuated by a jack 13 of axis XX housed in a floating bearing 8 of the cylinder head 50.
  • the bearing 8, concentric with the jack 13, comprises an outer ring 9 connected to the ring 4 by elastic supports 5, angularly distributed opposite the claws 20.
  • the jack 13 is double-acting, its supply being ensured by a rotating joint 14 and it comprises a rod 15 provided with a head 16 raised capable of cooperating with the claws 20 to cause them to tilt around articulations 21 carried by arms 11 themselves supported by the shaft 10 with which they are integral.
  • Each claw 20 therefore cooperates with a support arm 11, these arms thus being distributed around the axis X-X at the same angular intervals as the claws 20, of joints 21, of axes Z-Z '.
  • a hollow shaft 10 of axis X-X is interposed between the bearing 8 and the jack 13 which is therefore housed inside the shaft 10.
  • the arms 11 have an inverted L-shaped profile, the upper branch of which, parallel to the axis X-X ends in an end face 12 intended to come into abutment in the bowl 24, as will be explained below.
  • Each articulated claw 20 is constituted by a bent lever on either side of the articulation 21 carried by the corresponding arm 11.
  • Each lever has a part 20a which extends radially towards the axis XX from the articulation 21 and which ends with a fork 19 articulated in a yoke 17 fixed to the head 16 of the rod 15 of the jack 13.
  • Trunnions 18 are fixed transversely in the yokes 17 and engaged inside the corresponding forks 19, so as to be able to drive the claws 20 in rotation by the alternating movements of the head 16 and the yokes 17 integral with the latter.
  • Each lever constituting a claw 20 also comprises a part 20b bent with respect to the substantially radial part 20a with which it forms an acute angle and this part 20b is provided with a terminal spout 22 for gripping the bowl 24.
  • each claw 20 has roughly the shape of a number "7" or evokes the profile of a bird whose radial part 20a constitutes the plume tail or the leg of the number "7".
  • the bowl 24 has a generally annular shape of axis XX and comprises an annular housing 51 coaxial with the bowl 24 and open in the direction of the cylinder head 50.
  • the housing 51 is arranged to receive the gripping jaws 22 of the claws 20 when these these are pivotally driven around their articulations 21 by the head 16 and the rod 15 of the jack 13 displaced in the direction of the arrow F (FIG. 4), that is to say towards the fitting end 6.
  • the claws 20 are in their position for hooking and retaining the bowl 24 by their spouts 22 which bear against an inclined inner edge 23 of the housing 51.
  • the claws 20 driven by the pins 18 sliding in the yokes 19 pivot around the articulations 21 counterclockwise, this which separates the spouts 22 from their bearing edges 23 (FIG. 4) and unlocks the bowl 24 relative to the cylinder head 50.
  • the bowl 24 is provided, on its face opposite the housing 51, with a projecting surface or crown 34 of axis XX, arranged to fit into a surface 36 of conjugate profile formed on the core 3 in order to allow the bowl 24 to support the latter.
  • the bowl 24 is equipped with means for hooking into the socket 6 during the centrifugal casting.
  • These attachment members are constituted in a manner known per se, for example by keys 27 mounted to slide radially on the periphery of the bowl 24, associated with return springs 31 tending to keep these keys retracted into the bowl 24.
  • the keys 27 have conical end portions 29 arranged to come to bear against a ramp 28 of a circular protuberance 32 of the fitting end 6, externally bordering a circular groove 30 of this end.
  • the frustoconical tips 29 of the keys 27 can thus be applied to the ramp 28 of the protuberance 32 during casting under the thrust of the centrifugal forces which are exerted against the antagonistic stress of the springs 31, thereby locking the bowl 24 on the nesting end 6.
  • the bowl 24 is therefore automatically locked on the fitting end 6 as long as the centrifugal forces are greater than the restoring forces of the springs 31.
  • the keys 27 and the springs 31 are housed in recesses 26 suitably distributed over the periphery of the bowl 24.
  • the housing 51 is delimited on the side of the axis XX by an annular wall 25 forming a tapered skirt flared towards the cylinder head 50.
  • This wall or sun visor 25 has the function of stopping the projections of liquid metal into the environment of the casting machine, in the event of accidental rupture of the core 3 during the centrifugation of the pipe.
  • the keys 27 can slide along axes P-P orthogonal to the axis X-X. At rest, the conical points 29 are retracted with respect to the protuberance 32 and are inscribed inside a fictitious circle of diameter smaller than that of said protuberance 32.
  • the outer wall 35 of the housing 51 is frustoconical and in the extension of the skirt 34, so as to be able to come to be applied on the inner edge of the fitting end 6, the core 3 bearing on a face of annular support 33 of the bowl 24 and constituting the bottom of the housing 51.
  • the nesting core 3 is placed by the operator on the bearing face 33 of the bowl 24 opposite the cylinder head 50, so that the bearing 34 comes to fit into the conjugate bearing 36 ( Figure 2), the bowl 24 being locked on the cylinder head 50 by the claws 20, the spouts 22 of which are locked on the inner edge 23 by the jack 13, as explained above.
  • the assembly constituted by the cylinder head 50, the bowl 24 and the core 3 is then handled by means known per se and not shown, to cause this assembly to translate along the axis XX at the end of which the core 3 comes introduce itself inside the fitting end 6 and the bowl 24 is housed in the outside of this end ( Figure 3).
  • the frusto-conical wall 35 is therefore applied to the corresponding inner face of the fitting end 6, while the keys 27 are kept retracted in their housing by the return springs 31.
  • the shell 1 and its socket 6 rotate around the axis XX, and the skirt 34 and the frustoconical wall 35 are self-centering in the socket 6, thanks to the flexibility of the elastic supports 5 which provide a certain degree of freedom to the cylinder head 50.
  • the integral assembly constituted by the core 3, the bowl 24 as well as the support, control and locking members (10, 11, 13, 16 to 22) starts to rotate around the axis XX, the shaft 10 rotating inside the bearing 8 at the same speed as the shell 1. Therefore the keys 27 penetrate more and more in the grooves 30 sounds the thrust of the centrifugal forces, until their frustoconical ends 29 come to be applied on the inner ramp 28 of the protuberance 32.
  • the actuator 13 is controlled to retract its rod 15, which makes the claws 20 pivot around the joints 21 by the intermediate of the pins 18 sliding in the forks 19 (Figure 4).
  • the nozzles 22 therefore deviate from the retaining edges 23, which separates the bowl 24 from the cylinder head 50.
  • the abovementioned means of handling the cylinder head 50 are then used to move the latter away from the bowl 24, the ends 12 of the arms 11 then leaving the housing 51 ( Figure 5).
  • the cylinder head 50 is thus moved away from the casting machine B, and the pipe T is centrifuged.
  • the device A for supporting the nesting core 3 which has just been described has the following advantages.
  • the automatic locking device of the bowl 24 on the socket 6, constituted by the centrifugal keys 27 known per se makes it possible to separate the bowl 24 from the cylinder head 50 and therefore to visually monitor the pouring inside the shell 1.
  • this dissociation of the bowl 24 and the cylinder head 50 relieves the mechanisms used, the cylinder head 50 no longer exerting axial thrust on the bowl 24 during casting.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
EP84104781A 1983-05-11 1984-04-27 Dispositif de support de noyau d'emboîtement pour moule centrifuge de tuyaux en fonte à emboîtement Expired EP0125549B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8307939A FR2545740B1 (fr) 1983-05-11 1983-05-11 Dispositif de support de noyau d'emboitement pour moule centrifuge de tuyaux en fonte a emboitement
FR8307939 1983-05-11

Publications (2)

Publication Number Publication Date
EP0125549A1 EP0125549A1 (fr) 1984-11-21
EP0125549B1 true EP0125549B1 (fr) 1987-01-07

Family

ID=9288820

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84104781A Expired EP0125549B1 (fr) 1983-05-11 1984-04-27 Dispositif de support de noyau d'emboîtement pour moule centrifuge de tuyaux en fonte à emboîtement

Country Status (7)

Country Link
US (1) US4611650A (enrdf_load_stackoverflow)
EP (1) EP0125549B1 (enrdf_load_stackoverflow)
JP (1) JPS59212158A (enrdf_load_stackoverflow)
CA (1) CA1240822A (enrdf_load_stackoverflow)
DE (1) DE3461894D1 (enrdf_load_stackoverflow)
ES (1) ES8403760A1 (enrdf_load_stackoverflow)
FR (1) FR2545740B1 (enrdf_load_stackoverflow)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62124060A (ja) * 1985-11-22 1987-06-05 Kubota Ltd 遠心鋳造機のコアセツタ
JPS6382612U (enrdf_load_stackoverflow) * 1986-11-19 1988-05-31
JPS6387108U (enrdf_load_stackoverflow) * 1986-11-27 1988-06-07
US6799625B2 (en) * 2002-04-10 2004-10-05 Amcan Consolidated Technologies Corp. Sealing arrangement for a movable insert for a die casting mold having a retractable core
CN105328159B (zh) * 2015-11-27 2018-04-10 新兴河北工程技术有限公司 一种离心机用拔管机构
CN109351924A (zh) * 2018-12-11 2019-02-19 广西玉柴机器股份有限公司 一种可变厚度的芯撑及其制作方法
JP7675702B2 (ja) * 2020-12-21 2025-05-13 Ｔｐｒ株式会社 遠心鋳造用金型、遠心鋳造用金型の組立装置

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1613899A (en) * 1926-01-29 1927-01-11 Sand Spun Patents Corp Centrifugal pipe head core
US1983075A (en) * 1931-06-02 1934-12-04 Durafer Centrifugal casting machine
DE846279C (de) * 1944-08-06 1952-08-11 Eisenwerke Gelsenkirchen A G Verfahren und Vorrichtung zur Herstellung von Schleudergussstuecken
US3004314A (en) * 1959-09-17 1961-10-17 United States Pipe Foundry Centrifugal casting process
FR1379365A (fr) * 1964-01-08 1964-11-20 United States Pipe Foundry Appareil pour la mise en place de noyaux de fonderie
GB1005813A (en) * 1964-08-05 1965-09-29 Stanton & Staveley Ltd Improvements in and relating to centrifugal casting machines
FR1507311A (fr) * 1966-11-17 1967-12-29 Ct De Rech S De Pont A Mousson Dispositif de support pour la mise en place et le verrouillage du noyau d'un moule de centrifugation et noyau adapté à ce dispositif
FR2051993A5 (enrdf_load_stackoverflow) * 1969-07-03 1971-04-09 Pont A Mousson
FR2091860A1 (enrdf_load_stackoverflow) * 1970-02-04 1971-01-21 Pont A Mousson
SU850290A1 (ru) * 1979-11-01 1981-07-30 Липецкий Трубный Завод Производственногообъединения "Липецксантехника"Мпсм Рсфср Устройство дл подачи и фиксацииРАСТРубНОгО СТЕРжН МАшиНы дл цЕНТРОбЕж-НОгО лиТь ТРуб

Also Published As

Publication number Publication date
JPS59212158A (ja) 1984-12-01
ES524664A0 (es) 1984-05-01
EP0125549A1 (fr) 1984-11-21
FR2545740A1 (fr) 1984-11-16
DE3461894D1 (en) 1987-02-12
ES8403760A1 (es) 1984-05-01
FR2545740B1 (fr) 1985-07-12
US4611650A (en) 1986-09-16
CA1240822A (fr) 1988-08-23
JPS6110220B2 (enrdf_load_stackoverflow) 1986-03-28

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