US3456712A - Centrifugal casting method - Google Patents

Centrifugal casting method Download PDF

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Publication number
US3456712A
US3456712A US525435A US3456712DA US3456712A US 3456712 A US3456712 A US 3456712A US 525435 A US525435 A US 525435A US 3456712D A US3456712D A US 3456712DA US 3456712 A US3456712 A US 3456712A
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United States
Prior art keywords
mold
pipe
casting
trough
spray
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Expired - Lifetime
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US525435A
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English (en)
Inventor
Arthur E Schuh
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.)
United States Pipe and Foundry Co LLC
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United States Pipe and Foundry Co LLC
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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
    • B22D13/10—Accessories for centrifugal casting apparatus, e.g. moulds, linings therefor, means for feeding molten metal, cleansing moulds, removing castings
    • B22D13/101—Moulds
    • B22D13/102—Linings for moulds
    • 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

Definitions

  • the present invention relates to the manufacture of tubular metal castings, and more particularly is concerned with the manufacture of cast iron pipe having bell and spigot ends in permanent metal molds rotated substantially horizontally.
  • the machine operator brings the bold up to speed and actuates the mechanism controlling the tilting of the ladle.
  • the iron has filled the bell space at which time the operator starts moving the mold carriage longitudinally down the bed.
  • Patent No. 2,399,606 and known in the art as wet spray. Briefly stated, that invention comprises spraying the inner surface of the metal mold with a liquid suspension of a powdered refractory material and a binder to form'incrementally an insulating coating adherent to the mold and having a multiplicity of spaced protuberances von its inner face.
  • the principal object of the present invention to provide a casting procedure or method for producing pipe by the retrac-tive pour method wherein only one two-way stroke of the mold is required for the production of each pipe and a wet spray coating is used.
  • Another object of the invention is the provision of a casting method whereby pipe can be made in a permanent metal mold without the necessity of a separate two-way traverse of the mold for insertion of a bell core or for applying a mold coating.
  • Still a further object is to provide a method for casting metal pipe in a permanent mold in which the mold is moved in one direction along its horizontal axis to form the pipe and is moved in the opposite direction to extract the pipe and put the mold in position for another cycle.
  • Still another object is the provision of a method for casting metal pipe in a permanent metal mold in a shorter time than heretofore considered possible.
  • FIGURE 1 is a top view in cross section of a pipe casting machine suitable for practicing the process of illustrating the position of the machine components at the start of a casting cycle.
  • FIGURE 2 illustrates the position of the machine components at an intermediate stage in the casting cycle.
  • FIGURE 3 illustrates the position of the machine components at the end of a casting cycle.
  • FIGURES 4-7 illustrate suitable positions for the spraying nozzle with respect to the spout end of the pouring trough.
  • FIGURES 1-3 such a machine comprises a Water box 1 which is mounted on wheels 2 riding on tracks 3.
  • Rotatably mounted on rollers 4 within the water box is mold 5 which is driven by motor 6 through poly-Y in the mold and secures it in place while the pipe is belt 7.
  • trough 8 At one end of the carriage a puring. trough 8 is,
  • the casting machine is preferably provided with a core setting mechanism which holds a core in position outside the mold until the proper time in the casting cycle when it quickly seats the core being cast.
  • This core setting apparatus comprises an arm 12 which is secured to a shaft 13 and on its free end it is provided with a bearing support 14 in which a boss is rotatably mounted. Core 15 is seated on the boss and is backed up by flange 16 secured to the boss. Shaft 13 extends through a sleeve 17 and is secured to the rod of a fluid cylinder 18 by means of coupler 19. Sleeve 17 is provided with a slot 20 into which pin 21 projecting from shaft 13 extends.
  • Slot 20 as illustrated consists of a helical portion with a longitudinal portion at each end.
  • pin 21 is positioned in the slot 20 so that core 15 is seated in the end of the mold.
  • pin 21 is moved from one longitudinal portion of the slot, through the helical portion of the slot, and into the opposite longitudinal portion of the slot.
  • shaft 13 is moved longitudinally and rotated so that the free end of arm 12 is moved away from and clear of the end of the mold.
  • a new core 15 is placed on the core setter and held in position until the movement of the fluid cylinder 18 is reversed and it is thereby moved into alignment with and seated in the end of the mold.
  • spray nozzle 23 In order to carry out the present process, it is necessary to provide a spray nozzle 23 near the end of the pouring trough. This nozzle is fed by means of fluid lines 24 which are secured to the side of trough 8i and covered with shield 25.
  • spray nozzle 26 is mounted on the end of swinging arm 27. This arm swings into the position shown in FIGURE 3 at the end of a casting cycle to spray the bell caviy before core 15 is seated in the mold at the start of a new casting cycle.
  • FIGURES 1-3 depict diagrammatically the operations performed and the positions of the components of the apparatus at different stages of the casting cycle.
  • the mold In the first position, FIGURE 1, the mold surrounds the pouring trough.
  • the bell end of the mold was coated at the end of the extraction stroke in the previous casting cycle, and the core was seated in the end of the mold by moving shaft 13 toward cylinder 18.
  • the shaft rotates due to pin 21 moving through the helical part of slot 20 the core 15 is moved into alignment with the end of the mold 5, and as the pin then moves along the longitudinal portion of the slot the core is seated in the mold.
  • Ladle 11 is tilted at a uniform rate causing a stream of metal to flow down trough 8 into the spinning mold.
  • ladle dump is actually started before the core is set in place so that there will be very little delay between the time the core is set in the mold and metal first starts to pour into the mold.
  • cylinder is activated to withdraw the mold 5 from trough 8, and :a fan spray of coating is applied to the mold simultaneously through nozzle 23.
  • coating material and molten metal are applied along the length of the mold, the leading edge of the spray being only a short distance ahead of the leading edge of the molten metal at all times, e.g. three or four inches.
  • the spray nozzle 23 be positioned to give complete and uniform coverage of the mold. If the nozzle is too far from the end of the trough, it does not adequately spray the mold in the area behind the bell cavity, and-this area cannot be sprayed by a bell spray such as nozzle 26. The presence of the trough in the mold while nozzle 26 is spraying makes it impossible to spray any appreciable part of the mold bore by spraying from the bell end. On the other hand, if the nozzle 23 is too close to the end of trough 8 it will spray into the metal which is in the mold, onto the mold at a point which is too close to the area of metal impingement to permit the moisture to dry out of the coating slurry or down the barrel of the pipe being cast.
  • the best results are obtained when rapid casting rates are maintained with maximum delays. This results in a mold temperature that is hot enough to assure that the coating will dry almost instantly and that the metal solidification next to the coating will be delayed sufficiently to permit the escape of gases through the molten metaL whenever a delay occurs at the end of a casting cycle, the mold should be retracted-from the trough and the coating applied even though metal is not being poured into the mold. When this is done, the coating will dry satisfactorily and the mold will be properly coated when casting is resumed.
  • Method for making tubular metal castings by retractive casting in a substantially horizontal mold comprising; positioning the mold and trough so that the trough is within the mold, providing the end portion of the mold adjacent the spout of the trough with a wet spray coating, securing an end forming means in the end of the mold adjacent the spout end of the trough, rotating the mold, appying a helical spiral of molten metal along the length of the mold and simultaneously spraying from a nozzle positioned near the spout end of the trough a wet spray coating onto the mold a short distance ahead of the leading edge of the helical spiral of molten metal by providing relative longitudinal movement between the trough and mold, and extracting the pipe from the mold after solidification.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
US525435A 1966-02-07 1966-02-07 Centrifugal casting method Expired - Lifetime US3456712A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US52543566A 1966-02-07 1966-02-07

Publications (1)

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US3456712A true US3456712A (en) 1969-07-22

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US525435A Expired - Lifetime US3456712A (en) 1966-02-07 1966-02-07 Centrifugal casting method

Country Status (11)

Country Link
US (1) US3456712A (fr)
BE (1) BE692741A (fr)
BR (1) BR6786668D0 (fr)
CH (1) CH463712A (fr)
DE (1) DE1558333A1 (fr)
ES (1) ES334523A1 (fr)
FI (1) FI47289C (fr)
FR (1) FR1508748A (fr)
GB (1) GB1120155A (fr)
NL (1) NL6700879A (fr)
SE (1) SE339979B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4084632A (en) * 1976-03-08 1978-04-18 Kubota, Ltd. Applicator nozzle for use in centrifugal casting
US4095643A (en) * 1974-11-29 1978-06-20 American Cast Iron Pipe Company Agent feeder for pipe casting apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110560658B (zh) * 2019-08-29 2023-08-01 杭州春风机械工程股份有限公司 一种用于离心铸管机的上芯行车

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE469570C (de) * 1926-02-03 1928-12-15 Carl Billand Verfahren zur Herstellung von Rohren durch Schleuderguss
US1982762A (en) * 1934-01-10 1934-12-04 United States Pipe Foundry Method for casting metallic annuli
US2262184A (en) * 1940-12-14 1941-11-11 United States Pipe Foundry Method and apparatus for coating molds
US2399606A (en) * 1943-12-04 1946-04-30 United States Pipe Foundry Centrifugal casting
US2853755A (en) * 1955-01-13 1958-09-30 Beyer John Henry Centrifugal casting method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE469570C (de) * 1926-02-03 1928-12-15 Carl Billand Verfahren zur Herstellung von Rohren durch Schleuderguss
US1982762A (en) * 1934-01-10 1934-12-04 United States Pipe Foundry Method for casting metallic annuli
US2262184A (en) * 1940-12-14 1941-11-11 United States Pipe Foundry Method and apparatus for coating molds
US2399606A (en) * 1943-12-04 1946-04-30 United States Pipe Foundry Centrifugal casting
US2853755A (en) * 1955-01-13 1958-09-30 Beyer John Henry Centrifugal casting method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4095643A (en) * 1974-11-29 1978-06-20 American Cast Iron Pipe Company Agent feeder for pipe casting apparatus
US4084632A (en) * 1976-03-08 1978-04-18 Kubota, Ltd. Applicator nozzle for use in centrifugal casting
US4098462A (en) * 1976-03-08 1978-07-04 Kubota, Ltd. Applicator nozzle for use in centrifugal casting

Also Published As

Publication number Publication date
FI47289B (fr) 1973-07-31
FI47289C (fi) 1973-11-12
BE692741A (fr) 1967-07-03
GB1120155A (en) 1968-07-17
FR1508748A (fr) 1968-01-05
BR6786668D0 (pt) 1973-02-15
DE1558333A1 (de) 1970-03-19
ES334523A1 (es) 1968-02-01
CH463712A (fr) 1968-10-15
SE339979B (fr) 1971-11-01
NL6700879A (fr) 1967-08-08

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