US3419066A - Centrifugal casting machine - Google Patents

Centrifugal casting machine Download PDF

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Publication number
US3419066A
US3419066A US616614A US61661467A US3419066A US 3419066 A US3419066 A US 3419066A US 616614 A US616614 A US 616614A US 61661467 A US61661467 A US 61661467A US 3419066 A US3419066 A US 3419066A
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Prior art keywords
extractor
pipe
switch
circuit
travel
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Expired - Lifetime
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US616614A
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English (en)
Inventor
Lorang Pierre Edouard
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Centre de Recherches de Pont a Mousson
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Centre de Recherches de Pont a Mousson
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    • 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
    • B22D13/12—Controlling, supervising, specially adapted to centrifugal casting, e.g. for safety reasons
    • 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
    • B22D13/02—Centrifugal casting; Casting by using centrifugal force of elongated solid or hollow bodies, e.g. pipes, in moulds rotating around their longitudinal axis
    • B22D13/023—Centrifugal casting; Casting by using centrifugal force of elongated solid or hollow bodies, e.g. pipes, in moulds rotating around their longitudinal axis the longitudinal axis being horizontal
    • 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
    • B22D13/108—Removing of casting

Definitions

  • ABSTRACT F THE DISCLOSURE Centrifugal casting machine comprising an extractor for extracting the cast pipe from the mould and a control device automatically controlling operation of the extractor, the control device comprising photoelectric cell means responsive to the presence of one pipe end in the mould and to the extraction of the other pipe end. If the extractor fails to extract the pipe, the photoelectric means cause the extractor to make further attempts at extraction. If the pipe breaks inside the mould the photoelectric means stop operation of the extractor to enable a manually-controlled extraction of the remaining piece of pipe.
  • the present invention relates to centrifugal casting machines for casting pipes having a socket in accordance with the de Lavaud method, said machines having a cooled metal shell or mould, pouring trough and movable extractor, and more particularly to an automatic control device for these machines which strips and withdraws the pipes.
  • extractor is a carriage carrying an automatic tongs.
  • the carriage approaches the end end of the centrifugal casting mould and the to-ngs grips the inside of the socket of the pipe which is still in the mould and, as the carriage moves rearwardly, the tongs extracts the pipe from the shell.
  • this extractor can be brought into action by a contactor actuated by the machine at the required moment, that is, at the end of the centrifugal casting. If no extraction occurs, that is, if the tongs grips the pipe in an unsatisfactory manner so that the pipe remains inside the mould, it is necessary to return the extractor towards the pipe for a further attempt at extraction. This requires an attentive supervision and the continual presence of an operator. Further, human intervention stopping the automatic operational cycle slows down the rate of production.
  • the object of the present invention is to provide a centrifugal casting machine of the aforementioned type which is so improved as to avoid the necessity of human supervision owing to a stoppage of the automatic cycle without delay in the event of an imperfect extraction and, if need be, an automatic return of the extractor to the pipe gripping position so as to recommence the stripping operation.
  • the loss of time is small.
  • the centrifugal casting machine has a device electrically controlling the jack shifting the extractor, an electrovalve and relay automatically operating the extractor and is so arranged that the control device comprises two contactors placed respectively at the forward point of the travel of the extractor and at a short distance from said forward point, and in combination with the contactors: a photoelectric cell secured to the mould-carrying carriage at the pipe socket end of the mould, said photo-electric cell being oriented in such manner as to be responsive to the exit of the socket of the pipe at the moment of extraction, a second photoelectric cell capable of being eclipsed and mounted on the 3,419,066 Patented Dec.
  • the second cell is eclipsable so as not to be responsive to the radiation of the iron contained in the pouring trough. It can be withdrawable or combined with a withdrawable screen.
  • FIG. 1 is a diagrammatic assembly view of a centrifugal casting machine equipped with the electric control device according to the invention
  • FIG. 2 is a partial diagrammatic elevational view of one end of the carriage carrying a retractable photo-electric cell, the latter being in its operative position;
  • FIG. 3 is a view similar to FIG. 2, the cell being in its retracted position
  • FIG. 4 is the diagram of the principle of operation of the electric control device according to the invention.
  • FIG. 5 is a partial diagrammatic view corresponding to FIG. l of the machine in its position at the start of the withdrawal of a vcast pipe
  • FIG. 6 is a view similar to FIG. 5 of course of pipe withdrawal.
  • the illustrated embodiment concerns a casting machine of the de Lavaud type for centrifugally casting pipes.
  • This machine comprises a tiltable casting ladle A which pours the molten metal into a pouring trough or passage B.
  • the latter pours the metal into a shell or mould 1 carried by a carriage C which travels between points a and b of a runway which is slightly downwardly inclined from a to b.
  • a movable extracting carriage E ca-rrying an automatic ton-gs P adapted to take hold of the cast pipe C inside the pipe socket so as to extract the pipe from the mould 1.
  • the extractor E is movable on a runway which is also inclined between an upper point c and a lower point d.
  • the extractor E is attached to a cable 2 which extends around pulleys 3 and around a pulley 4 carried at the end of the piston rod of a jack V so as to form .a pulley block arrangement. The ends of this pulley block arrangement are secured at points 5 and 6.
  • This pulley block is of known type and enables a jack V whose travel is only half that of the extractor E to be employed.
  • Withdrawable supports 7 for the stripped pipe T are located above the runway c-d of the extractor E. They are withdrawn automatically to clear the extractor E at the required moment.
  • the centrifugal casting machine is equipped with an electric control device for immediately detecting and defect in the extraction and remedying this defect.
  • This electric control device is constructed in the following manner:
  • the carriage C carries, at the pipe socket end of the mould 1, a rigidly mounted photoelectric cell which is so oriented as to be responsive to the exit of the socket of the pipe T being extracted (FIGS. 1, 5 and 6), and, at the pipe male or smooth end of the mould 1, a second retractable photoelectric cell 9 which is so oriented in its operative position as to be pointed at the interior of the end of the mould corresponding to the male end of the pipe to be cast.
  • the cells 8 and 9 are both responsive to the radiation of the molten iron and to the iron in course of solidilication.
  • the retractable cell 9 is mounted at the end of a lever 10 which is mounted on the outside of the body of the carriage C to pivot about a pin 11.
  • the lever 10 is shifted by a single-acting jack 12 having a return spring 13, for example through a mechanism comprising a rack 13a and a pinion 13b. It is swung into the operative position when the jack 12 is fed with fluid under pressure and retracted by the spring 13 as soon as the jack 12 is no longer fed.
  • the ⁇ iack 12 is actuated by an electrovalve under the control of a mechanical contact 14 mounted at the lower point b of the runway for the carriage C.
  • the closure of the contact 14 by the carriage C at the lower point d of its travel swings the photoelectric cell 9 to the operative position of the latter.
  • a mechanical contact 15 placed on the runway c-d of the extractor E at a short distance from the upper point c gives the signal for the automatic return of the extractor E in the case of non-extraction or the immediate stoppage in the case of breakage of the pipe.
  • the Contact 15 is actuated upon the passage of the extractor E and throughout the time of its presence between the position of the contact 15 and the upper point c of its travel, by a ramp D carried by the extractor E. It is released or unactuated for the rest of the time.
  • the electric control device comprises, broadly speaking, three circuits connected in parallel on a double wire network 16 supplying electrovalves controlling the jack V of the extractor E, namely a control circuit 17 for controlling the upward or forward travel of the extractor E from the point d to the point c and also the automatic return of the extractor E towards the carriage C subsequent to a non-extraction, that is, in the event that the pipe remains completely within the mould without being drawn along by the tongs P of the extractor; a control circuit 17a for controlling the downward or rearward travel of the extractor from the point c to the point d; a circuit 18 for maintaining the automatic extracting cycle, the opening of this circuit immediately stopping the automatic extracting cycle, in particular when the cast pipe T has broken inside the mould 1 and only a single piece is extracted, the remainder of the pipe remaining inside the mould.
  • an electrovalve EV controlling the forward and rearward travel of the extractor E
  • the switch F of a contactor Cc corresponding to the end-of-travel of the extractor at the point c of its travel.
  • the switches Ag and B9 of the amplifier relays 8a and 9a, which are respectively actuated by the photoelectric cells 8 and 9, and the switch C15 relay the mechanical contact 15.
  • the switch A8 is closed at rest and opened when the cell S is actuated.
  • the switch B9 is open at rest and closed when the cell 9 is actuated.
  • the switch C15 and the Contact 26 of the contactor Cc are opened when they are actuated and remain closed at rest.
  • the electrovalve EV is also connected in series in the circuit 17a with the switch G of the double contactor Cc.
  • the contactor Cc When the contactor Cc is open at F in the circuit 17 it is closed at G in the circuit 17a and vice versa.
  • a return spring 28 returns it to the closed position in the circuit 17.
  • the double contactor Cc performs the function of a reversing switch for the electrovalve EV.
  • the contactor Cc controls this electrovalve for a direction of travel of the extractor towards the point c.
  • the contactor controls the electrovalve for a direction of travel of the extractor towards the point d.
  • the electrovalve is controlled in the known manner (not shown in the drawing) so that a pulse or momentary feed of the circuit 17 or the circuit 17a is suiiicient for causing the forward or rearward travel of the extractor E.
  • relay RA mounted in the circuit 18 for maintaining the automatic cycle is a relay RA which allows the automatic extraction cycle.
  • This relay RA controls an electric crcuit of known type (not shown) on which depends the automatic operation of the machine.
  • a push-button 20 for the resumption of the automatic operation of the extractor after stoppage of the automatic cycle.
  • Mounted in the other branch 21 of the circuit 18 is a switch Ha for the self feed of the relay RA.
  • the push-button 20 and the switch Ha are combined with each other by an electric connection of known type, symbolically represented by a dot-dash line, so that pressure exerted on the push-button 20 closes the switch Ha and excites the relay RA, if the latter is open. In normal operation, the switch Ha is closed.
  • the branch 21 is divided into three parallel conductors 23, 24, 25 which are connected to the second wire of the feed circuit 16. Mounted in each of these conductors are respectively the switch A85, the switch B89 actuated by the cells 8 and 9, and the switch D15 controlled by the contact 15 in the same way as the switch C15 is closed.
  • the passage of current in one of the three conductors connected in parallel 23, 24, 25 feeds the circuit 18. If the current no longer passes in any of the three conductors, the switch Ha opens and stops the relay RA which allows the automatic operation. The circuit 18 is then open.
  • the casting apparatus operates in the following manner:
  • the extractor E travels up to the forward or upper point c of its runway and introduces the tongs P into the socket of the cast pipe.
  • the extractor E then travels rearwardly and extracts the cast pipe T.
  • the stripped or extracted pipe T rests on the Withdrawable supports 7. After the extraction and discharge of the pipe T, the supports 7 are withdrawn. A new core is placed in the socket of the mould 1 and the cycle recommences.
  • the electric control device operates in the following manner:
  • the closure of the circuits 17 and 18-2123 allows the automatic forward travel of the extractor E towards the carriage C.
  • This extractor travels towards the point c of its travel and actuates the contactor (opening of the switch C15 and closure of the switch D15).
  • the extractor continues to travel towards the point c since the electrovalve EV has recived a forward travel pulse.
  • the extractor actuates the contactor Cc and thus opens the switch F of the contactor Cc in the circuit 17 and closes the switch D in the circuit 17a. Consequently:
  • the extractor effects automatically its downward or rearward travel following the rearward travel control pulse given by the contactor Cc to the electrovalve EV and, in passing by the contact 15, releases it. Simultaneously, the switch C15 is closed and the switch D15 opened. The circuit 18-21-24 remains closed and therefore supplied with current. The circuit 17 remains open. When the extractor stops at the lower point d of its travel, the pipe T is completely extracted. The cells 8 and 9 are no longer actuated and the switches A8, ASB and BSg are closed, the switch B9 remaining open. Consequently:
  • the extractor E must wait before travelling forwardly until the cell 9 is actuated, that is to say, until the pipe has been completely cast.
  • the cell 8 is actuated and the cell 9 is also actuated by the piece of pipe corresponding to the male end remaining in the mould.
  • the switches A11, ASB and BSS are opened.
  • the switch B9 is closed.
  • the switches C15 and D15 are opened.
  • the three branches 23, 24, 25 are opened.
  • the circuit 18, 21 is opened. Consequently, the switch Ha is also opened and the relay RA of the circuit 18, 21 is no longer fed.
  • the automatic operation is therefore stopped. Everything stops at the end of the travel of the extractor E to the point d. It is therefore necessary to extract manually the piece of pipe remaining in the mould.
  • an extension is mounted on the extractor E which permits gripping the piece remaining in the mould and the extractor is caused to move forwards and backwards by means of push-buttons (not shown).
  • the cells 8 and 9 are no longer actuated.
  • the switches A5, A811, BS9 are once more closed.
  • the circuit 17 is opened (opening of the switch B9).
  • the circuit 17a is opened by the opening of the switch G of the contator Ca.
  • the circuits 18-21-23 and 18-21-24 still remain open( opening of the switch Ha).
  • the carriage C of the mould moves towards the pouring trough B, releases the contact 14 which stops the supply to the jack 12 and retracts the cell 9 to the inoperative position.
  • a correction of a defective extraction that is, a return of the extractor to the point c can be effected automatically as soon as the extractor E depresses the contact 15 near the point c and consequently without loss of time. Owing to the retraction of the cell 9 during the casting stage, the automatic return of the extractor is not brought about in an untimely manner as would be the case if the photoelectric cell 9 were in the operative position when the iron flows through the pouring trough B.
  • a retractable cell 9 instead of providing a retractable cell 9 there could be provided a cell 9 which is fixed to the carriage C but provided with a retractable screen disposed in front of the cell. Said screen would be operated by a jack under the same conditions as the pivoting of the lever 10vr so as to mask the cell 9 during the casting stage and unmask it during the extracting stage.
  • the cell 8 could be mounted on the side of the machine and have a horizontal sighting line.
  • the Contact could change, in the known manner, the speed of the extractor E.
  • the latter changes from a very low speed in the upper part of its travel, between the position of the contacter 15 and the point c, to a high speed between the position of the contactor 15 and the lower point d and vice versa.
  • a centrifugal casting machine for casting a pipe having a socket end and a smooth male end, said machine comprising a mould carrying carriage, a mould on said carriage, a pouring trough, a pipe extractor movable between a rear point and a forward point, a jack for controlling the extractor and an electric control device for said jack having an electrovalve and a relay for automatic operation, said control device comprising, two contactors placed respectively at the forward point of the travel of the extractor and at a short distance from said forward point, and in combination with the contactors: a photoelectric cell secured to the mould-carrying carriage at the pipe socket end of the mould, said photoelectric cell being oriented in such manner as to be responsive to the exit of the socket of the pipe at the moment of extraction, a second photoelectric cell capable of being eclipsed and mounted on the carriage at the end thereof corresponding to the smooth male end of the pipe and so oriented as to be pointed at said male end inside the mould, the distance between said two photoelectric cells being slightly greater than the total
  • the control device comprises, on one hand, two control circuits connected in parallel for controlling an electrovalve actuating the jack controlling the movements of the extractor in both directions, said two control circuits being connected to the electrovalve to control the electrovalve, each of said circuits corresponding to one direction of movement of the extractor and having in series relation a switch of a double contactor corresponding to the end of travel of the extractor in the forward direction, the circuit of the forward travel comprising furthermore in series relation two switches controlled by relays associated with the photoelectric cells and a switch controlled by the contactor located at a short distance from the forward point of the travel of the extractor and, on the other hand, a circuit which has in series relation a relay which authorizes the automatic operation and is subdivided into branches having in series switches controlled by the photoelectric cells; and a switch of the contactor located at a short distance from the forward point of the travel of the extractor.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Centrifugal Separators (AREA)
  • Manufacturing Of Electrical Connectors (AREA)
  • Casting Devices For Molds (AREA)
US616614A 1966-03-10 1967-02-16 Centrifugal casting machine Expired - Lifetime US3419066A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR52824A FR1480187A (fr) 1966-03-10 1966-03-10 Machine perfectionnée à couler par centrifugation

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US3419066A true US3419066A (en) 1968-12-31

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US616614A Expired - Lifetime US3419066A (en) 1966-03-10 1967-02-16 Centrifugal casting machine

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US (1) US3419066A (fr)
BE (1) BE693946A (fr)
CH (1) CH468858A (fr)
CS (1) CS159729B2 (fr)
DE (1) DE1558188B1 (fr)
ES (1) ES338087A1 (fr)
FR (1) FR1480187A (fr)
GB (1) GB1139289A (fr)
NL (1) NL6702692A (fr)
SE (1) SE304819B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108637201A (zh) * 2018-07-27 2018-10-12 新兴铸管股份有限公司 接管车和接管托轮的位置检测装置及热模离心机接管车

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113600799B (zh) * 2021-06-22 2023-03-07 托普工业(江苏)有限公司 一种铸件拉取机构
CN117505799B (zh) * 2023-12-29 2024-04-02 河南省金汇彤科技有限公司 一种高温合金件离心铸造装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2853755A (en) * 1955-01-13 1958-09-30 Beyer John Henry Centrifugal casting method
US2943369A (en) * 1959-06-01 1960-07-05 United States Pipe Foundry Apparatus for centrifugal casting of pipe

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2853755A (en) * 1955-01-13 1958-09-30 Beyer John Henry Centrifugal casting method
US2943369A (en) * 1959-06-01 1960-07-05 United States Pipe Foundry Apparatus for centrifugal casting of pipe

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108637201A (zh) * 2018-07-27 2018-10-12 新兴铸管股份有限公司 接管车和接管托轮的位置检测装置及热模离心机接管车
CN108637201B (zh) * 2018-07-27 2023-07-18 新兴铸管股份有限公司 接管车和接管托轮的位置检测装置及热模离心机接管车

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Publication number Publication date
SE304819B (fr) 1968-10-07
DE1558188B1 (de) 1970-08-06
CH468858A (fr) 1969-02-28
CS159729B2 (fr) 1975-01-31
FR1480187A (fr) 1967-05-12
ES338087A1 (es) 1968-03-16
BE693946A (fr) 1967-07-17
GB1139289A (en) 1969-01-08
NL6702692A (fr) 1967-09-11

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