US2750639A - Feed-trough for centrifugal casting machine - Google Patents

Feed-trough for centrifugal casting machine Download PDF

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Publication number
US2750639A
US2750639A US329535A US32953553A US2750639A US 2750639 A US2750639 A US 2750639A US 329535 A US329535 A US 329535A US 32953553 A US32953553 A US 32953553A US 2750639 A US2750639 A US 2750639A
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United States
Prior art keywords
trough
channel
pouring
transverse
end surface
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Expired - Lifetime
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US329535A
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English (en)
Inventor
Dunz Jean
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
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Pont a Mousson SA
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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
    • B22D13/107—Means for feeding molten metal
    • 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
    • Y10T137/00—Fluid handling
    • Y10T137/9464—Faucets and spouts

Definitions

  • the present invention relates to feed-troughs for centrifugal casting machines.
  • a centrifugal casting trough should satisfy the following requirements:
  • the centrifugal casting machine includes at the rear a support on which the trough slides, which prevents excessive deflection of the latter when it is outside the mold and centers it in the opening of this mould. Then, when the whole of the trough is inside the mold the lower end of the trough (with respect to the direction of flow of the metal), which sags under the action of the weight of the iron, may rest in the mold and to this end is often provided with a rubbing ring in very hard metal. In any case, this deflection at the end of the trough does not exceed one or two centimetres and may be neglected for a trough of some length (six metres for example).
  • a trough in steel is usually employed that has a channel which is provided along its entire length with short segments in metal or a refractory material. These segments prevent too great a distortion by curving that results from increase in temperature. In this arrangement the expansion only affects the short segments or elements and the difference in the elongation of the different fibres remains small so that due to the independence of the segments, the trough practically does not distort under the action of heat.
  • the invention has for its object to provide an improved single-piece trough for a centrifugal casting machine for pipes and in particular pipes having a diameter between fifty and five hundred millimetres and a length anything up to six metres or more, this trough being practically free from any curving distortion due to heat and ensuring in consequence a regular flow or supply of the iron or other molten metal during the whole of the pouring period.
  • This trough is, moreover, adapted to be used with a rotating device for its cleaning after pouring.
  • the invention has also for its object to provide a machine for centrifugal casting improved so as to make use of the aforementioned pouring trough.
  • Fig. 1 is a view in side elevation of the general arrangement of a centrifugal casting machine improved in accordance with the invention.
  • Fig. 2 is a view in side elevation wtih a cut-away portion of a feed-trough in accordance with the invention.
  • Fig. 3 is a longitudinal section of this trough on line 3-3 of Fig. 2.
  • Figs. 4 to 6 are cross-sections of the trough on lines 4-4, 5--5, 6-6 respectively of Fig. 2, but to a larger scale.
  • Fig. 7 is a diagram showing the three cross-sections of Figs. 4 to 6 superposed.
  • the centrifugal casting machine for pipes for example pipes having a diameter of the order of mm. or more and a length of the order of six metres or more, comprises as known per se, a mold 1 rotatively mounted in a carriage 2 able to move longitudinally along rails 3 that may be horizontal or make a certain angle with the horizontal plane, these rails being then upwardly sloping from the right toward the left.
  • the molten metal for example molten casting iron, is poured into the mold 1 by a longitudinal pouring or feed-trough 4.
  • This trough is fixed at its upstream end (relative to the direction of flow of the molten metal) by a flange 5 to a down runner 6 into which is progressively emptied the contents of a ladle 7 oscillable about a horizontal axis 8.
  • the unit comprising the trough, the down runner and the ladle is mounted on a support (not shown).
  • the trough 4 rests at its downstream pouring end on a-support 9 fixed to the carriage 2 with which the support moves during the longitudinal displacement of the carriage.
  • the trough includes at its downstream end a pouring lip that may be, if desired, cut in the known manner on the bevel as shown at 10 in Fig. 3.
  • This trough has along its entire length a longitudinal channel 11.
  • the various cross-sections (Figs. 4 to 6) are inscribed, at least substantially within a circle C having a diameter at most equal to that of the mold in Which the trough is adapted penetrate (see Fig. 4).
  • Each of these cross-sections is defined externally, by two upper arcs of circles 12, connected by a small radius 13 to the channel :1 and, further, by a fiat face 14 to a lower convex face
  • the transverse shape or form of the channel 11 of the trough is composed of, in each cross-section, two lateral, rectilinear, obliquely disposed lines 16, downwardly converging toward the vertical axis XX at about 19. These two lines 16 are each connected, by a radiused portion 17 having its centre at O and a radius of about ten millimetres, to the portion 18 that is in the shape of an arc of a circle and is the concave bottom of the channel 11.
  • the distance 1 may be between one half and one third of the total depth of the channel of the trough and is preferably of the order of one third for troughs adapted for the centrifugal casting of pipes of small diameter, for example less than a hundred mm., for which the outer dimensions of the trough are limited by the inside diameter of the mold and where in consequence the dimensions of the channel must be as large as possible to ensure the supply or flow of the casting iron necessary for the formation of the pipe.
  • this height may be one half of the total height of the channel, as shown in the drawing.
  • d is between 1.1 and 1.15 times (1 (3) Relative to the longitudinal line 19 on the outer face of the base of the troughs 4- (which is parallel to the longitudinal axis of the mold 1), the bottom 18 of the channel 11 includes, starting from the upstream end and finishing at the pouring lip it a certain slope so that the thickness of the trough decreases progressively from a dimension 2 to a value substantially c from the upstream end to the downstream end of the trough (relative to the direction of fiow of the metal) in the region of the bottom of the channel.
  • the thickness of the trough is substantially constant over the full height of the side walls where it is e,
  • this thickness gradually increases up to a value substantially double, 2c, in the bottom part of the trough.
  • the channel of the trough is enlarged, the side walls have a thickness slightly less than e whereas the bottom has a thickness no more than of the order of e.
  • the machine provided with the above described trough is arranged so that the inclination of the mold 1 and the outer line 19 of the bottom of the trough 5 relative to the horizonal (the inclination may be nil, as represented) is such that, taking into account the pouring rate from the ladle 7, i. e.
  • the fluidity of the iron varies with temperature. it diminishes in particular rather rapidly as the point of solidification is neared. If the temperature of the pouring is far from the point of solidification, for example If it is 1300 (3., this variation is small, but it becomes material it the pouring is effected at a temperature around l200- 1250 C.
  • the increased depth and width of the channel provide the iron with a larger flow section as the iron becomes less fluid and the level of the free how does not rise but remains at a constant distance from the upper edges of the channel. Owing to this, the centre of gravity of the perimeter of the channel wetted by the molten metal and the centre of gravity of the cross-section of the trough remain coincident which restrains any bending of the neutral axis of the trough.
  • the trough conserves within certain limits the ability to distort so that it may always be in the working condition in which the centres of gravity coincide. For instance, supposing that for some reason the level of the liquid iron lowers in the channel, the centre of gravity of the wetted perimeter drops below that of the cross-section of the trough. The trough is then heated more toward the base than toward the top and it has a tendency to curve upwardly thereby decreasing the pouring slope and in consequence the rate of discharge which forces the level of the iron to rise.
  • the centre of gravity of the wetted perimeter passes above that of the trough and as the latter is heated more at the top than at the bottom it tends to curve downwardly thereby increasing the pouring slope and, in consequence, the rate of discharge which tends to return the level of the iron to the predetermined height.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
US329535A 1952-01-10 1953-01-05 Feed-trough for centrifugal casting machine Expired - Lifetime US2750639A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR956167X 1952-01-10

Publications (1)

Publication Number Publication Date
US2750639A true US2750639A (en) 1956-06-19

Family

ID=9487724

Family Applications (1)

Application Number Title Priority Date Filing Date
US329535A Expired - Lifetime US2750639A (en) 1952-01-10 1953-01-05 Feed-trough for centrifugal casting machine

Country Status (4)

Country Link
US (1) US2750639A (fr)
DE (1) DE956167C (fr)
FR (1) FR1056897A (fr)
GB (1) GB724991A (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1377406A (en) * 1920-08-27 1921-05-10 Lavaud Dimitri Sensaud De Rotary casting
US1776540A (en) * 1927-02-24 1930-09-23 Ferric Engineering Company Rotary casting apparatus
US2267896A (en) * 1941-06-25 1941-12-30 United States Pipe Foundry Centrifugal casting apparatus
US2523558A (en) * 1946-09-18 1950-09-26 Pompes Noel Soc Casting device for centrifugal casting machines

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1377406A (en) * 1920-08-27 1921-05-10 Lavaud Dimitri Sensaud De Rotary casting
US1776540A (en) * 1927-02-24 1930-09-23 Ferric Engineering Company Rotary casting apparatus
US2267896A (en) * 1941-06-25 1941-12-30 United States Pipe Foundry Centrifugal casting apparatus
US2523558A (en) * 1946-09-18 1950-09-26 Pompes Noel Soc Casting device for centrifugal casting machines

Also Published As

Publication number Publication date
FR1056897A (fr) 1954-03-03
DE956167C (de) 1957-01-17
GB724991A (en) 1955-03-02

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