US3812902A - Apparatus for preparing open sand molds suitable for casting large metal plates - Google Patents

Apparatus for preparing open sand molds suitable for casting large metal plates Download PDF

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Publication number
US3812902A
US3812902A US00195274A US19527471A US3812902A US 3812902 A US3812902 A US 3812902A US 00195274 A US00195274 A US 00195274A US 19527471 A US19527471 A US 19527471A US 3812902 A US3812902 A US 3812902A
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United States
Prior art keywords
roller
pattern
casting
mold
bed
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Expired - Lifetime
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US00195274A
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English (en)
Inventor
H Arbenz
J Caspar
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Alcan Holdings Switzerland AG
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Alusuisse Holdings AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C11/00—Moulding machines characterised by the relative arrangement of the parts of same

Definitions

  • Marmorek [57 ABSTRACT Open sand molds suitable for casting large metal plates, especially aluminium plates for building facades are prepared by using a large roller bearing a model and rolling spaced guides to level a bed of moldable substance therebetween and simultaneously impressing the molding pit in the bed.
  • stove casting also called open sand casting and hereinafter as such referred
  • stove casting has found its way into a new sphere of applications, i.e., for the casting of plane plates made from aluminium for building facades.
  • plane plates made from aluminium for building facades.
  • Such plates are not only exceptionally resistant to weather conditions, but, because of their very attractive and characteristic surface structures (cast striae, colored oxide accumulations, hammered effects, macro-crystals, craters and bubbles), have a popular architectonic effect.
  • cast striae colored oxide accumulations, hammered effects, macro-crystals, craters and bubbles
  • These. effects are advantageous inasmuch as the surfaces, which are solidified in free air without being in contact with the sand mold may be used as apparent and exposed surfaces.
  • a. ln a molding box requiring inversion:
  • the model a smooth plate having a prescribed wall thickness and usually provided with edges and ribs, is lain on to the mold or the Casting Plant floor; themolding box is placed over it and casting sand (green molding sand) is filled up and stamped.
  • the molding box is then inverted and the model lifted out.
  • the metal must be distributed by means of an adequate number of casting ladles, according to size, in order to produce thin, cold shotfree plates.
  • the model can be pressed in by loading it with weights or by means of a hydraulic cylinder. it is how ever necessary to load thin models uniformly with a ribbed construction made from wood or metal.
  • An object of the present invention is to considerably reduce this manual work by using a process which can be carried out in either half or full continuity.
  • the present invention refers to a process for the continual production of the above mold casting pits which are open at the top (open cast molds) for the production of plate-shaped metal casts, by molding a model in a bed filled with a moldable substance, in which one presses the entire open cast mold into a bed filled with a moldable substance by means of a mechanically driven stamping roller revolving on its own axis and by means of at least one model piece brought on to the roller.
  • the stamping of the plate molds is efiected by a continuous rolling procedure which can'be carried out at high speed (for example, approx. 0.2 m/sec.)
  • heat dissipation regulators such as chill plates or thermal insulators can be used as moldable substances or accessories for the stamping of the mold.
  • binding agents for example made from organic material which are either anhydrous or of low humidity can for example be used forthe preparation of moldable substances to be applied.
  • the process of the invention permits the production of molds usable for plates and also apparatus parts and the like made from all metals and alloys suitable for mold casting, including heavy and light metals, especially for the production of plates from aluminium and its alloys for the construction of facades.
  • the roller should exercise a pressure on the mold bed corresponding to the purpose for'which it is required.
  • the weight of the stamping roller can be increased, for example by filling with sand, water or the like, or one can, for example, increase the pressure of the roller on the moldable substance by such known means as, for example, hydraulic pressure or mechanical pressure such as of springs or screws.
  • One method of carrying out the process according to the invention is: that the roller, rotating on its own axis' ler revolving around its own longitudinal axis (but otherwise stationary) and stamps the open cast mold by means of the revolving roller into the bed.
  • the stamping roller is moved in a rolling manner on rails along the filled mold bed and stamps the open cast mold into the mod bed by means of the pressure of the roller.
  • the present invention also refers to devices for carrying out the above described process.
  • One such device has a mechanically driven stamping roller for stamping the open cast mold, said roller being provided with 'at least one stamp to produce a suitable model in a moldable substance.
  • the device can for example be so constructed that the mechanically driven stamping roller is a part of a mobile conveyor guided on or between rails and moved relatively to the mold bed and that the device has means such as rolls or chains to pilot the conveyor and to prevent it lifting ofi.
  • F lGS. l 6 illustrate schematically an example of the method of the process according to the invention in which the stamping roller rolls on rails above the filled bed and the open cast mold is stamped into the bed by the pressure of the stamping roller.
  • FIG. 1 is a side view drawn partly in section of a device for carrying out that method.
  • FIG. 2 illustrates a vertical cross section of the rolling procedure of a stamping roller.
  • FlG. 3 illustrates a longitudinal and also frontal view (right) of a strickle which serves to level and prepare a sandbed prior to the stamping procedure.
  • FIG. 4 illustrates a longitudinal, as well as a frontal view (right) of a separator which, inserted in a produced open cast mold, separates the individual cast 4 metal plates from each other during the metal melt into the open cast mold.
  • FlG. 5 illustrates part of a cross-section through a stamping roller to be applied according to the invention casting of on which a flexible model is bent upwards and secured.
  • FIG. 6 illustrates avertical longitudinal cross section parallel to the rolling direction of-the stamping roller of an already formed and prepared mold bed for castin a metal melt according to the invention.
  • a first pattern such as a tube 4 (as part of the model) which has about the same thickness as the plate to be cast.
  • the tube 4 is limited left and right by two rings 5 which serve to stamp the edges of the plates.
  • the width of the plates can be changed as desired by varying the length of the tube 4.
  • the rings 5 can be exchanged to alter the shape and height of the plate edges.
  • the rings 5 and the ring gibs 3 are secured to the stamping roller by means of screws.
  • the length of the individual plate molds to be produced is primarily dependent on the diameter of the stamping roller.
  • the tube 4 may be provided with a slit so wide that the circumference of the tube corresponds to approximately the length of the plates; model parts are then placed on the edges of the slit parallel to the rolling axis, which parts serve to stamp the plate edges which are parallel to the rolling axis.
  • the tube 4 can be left without cross slit, thereby rendering its entire circumference usable.
  • one can, for example, screw another pattern such as a gib 6 on to the tube 4, which gib serves to prepare the area of the edges on both the ends of the plates to be cast.
  • the width of the gib 6 then corresponds to the circumference of the tube, minus plate lengths, plus twice the edge width.
  • shrinkage of the casting metal In the case of aluminium alloys shrinkage is usually l.2 percent.
  • the moldable substance e.g., molding sand in the present example
  • a molding strickle illustrated in FIG. 3, is drawn above the surface of the moldable substance, being glided on the rails l and thereby guided ,by, the corner pieces 8 fixed on the lower side of the strickle 7 thus effecting an approximately equal distribution of the sand on the surface and, due to the cut-outs on the lower side of the strickle 7, an accumulation of sand on those places where the roller would effect a relatively low compactness.
  • This mainly refers to the areas between the longitudinal plate edges 5 and the rails l (FIG. 1).
  • FIG. 2 The stamping procedure and the periodical mold stamping of the gib 6 into the mold bed 9 is illustrated in FIG. 2.
  • the separator In order to form separate plates when casting the separator is put into the distance corresponding to the required plate lengths in the pit formed by pressing the gib 6 into the mold bed 9 (H68. 4, 6).
  • the recesses 11 on the ends of the separator 10 (FIG. 4) serve to act as supports on the rails 1.
  • Each pair of separators 10 are always bracketed together by means of spacers 12, or secured together, thus giving the distance b between the individual plates. It is suitable to construct and use the separators so that they lie well on the rails 1 and fit exactly in the mold pit.
  • separators l0 separation between plates can be effected by other means, for example by sand walls, or can be molded directly by corresponding shape of the stamping model on the roller.
  • model piece 4 is a plate made from a flexible metal, for example soft lead, together with the necessary edges, bending said plate up on the stamping roller 2 and then securing it by means of, for example, screws, nuts or other means.
  • a plastic plate can be produced which one accordingly applies by bending after being previously warmed.
  • single or multilayered rubber plates 14 of the same thickness as the open cast plates may be utilized, said rubber plates being bent around the stamping roller 2 and (FIG. 5) fixed by the gibs 6 which are screwed on to the roller.
  • the gibs 6 are provided with sharp, slightly protruding edges for the purpose of ensuring a secure fixing of the rubber plates 14. This permits a slight stretching of the plates and prevents them from slipping during rolling. If necessary an adhesive can be applied between the rubber plates 14 and the metal stamping roller 2.
  • the roller should not, of course, cant when being rolled on the rails 1, Le, the axis must always lie perpendicular to the direction of the rails.
  • cogs 17 are provided which grip in the holes 18 in the rails l and serve to guide the stamping roller 2.
  • each end of the stamping roller 2 with a toothed rim which grips in tooth racks or in the links of suspended chains which can be connected to the rails H.
  • the space provided between the rails l and the Casting Plant floor 19 serves as a degassing vent.
  • spaced guide means arranged in a horizontal plane for supporting lateral surface portions of the roller and operable for receiving a bed of moldable substance therebetween
  • roller and the guide means being movable relative to each other
  • said pattern including at least a pair of lateral rings axially mounted on the roller at a distance from said guide means and a substantially cylindrically curved plate secured on the roller between the rings, the outer diameter of the rings being greater than the outer diameter of the plate.
  • a pair of guides having upper surfaces arranged in a horizontal plane and defining therebetween a mold space for receiving a moldable substance
  • a stamping roller operable to be in rolling contact with said upper surfaces of the guides
  • a gib extending axially of said roller throughout the width of the curved pattern thereby being adapted to make impressions in said moldable substance throughout the pattern width thereof to separate adjoining pit patterns.
  • a device according to claim 1 further comprising at least one gib bridging said rings to separate adjoining pits.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
  • Press Drives And Press Lines (AREA)
US00195274A 1970-11-06 1971-11-03 Apparatus for preparing open sand molds suitable for casting large metal plates Expired - Lifetime US3812902A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1646270A CH528315A (de) 1970-11-06 1970-11-06 Verfahren zur fortlaufenden Herstellung von Herdgussformen zur Herstellung von plattenförmigen Metallabgüssen

Publications (1)

Publication Number Publication Date
US3812902A true US3812902A (en) 1974-05-28

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US00195274A Expired - Lifetime US3812902A (en) 1970-11-06 1971-11-03 Apparatus for preparing open sand molds suitable for casting large metal plates

Country Status (5)

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US (1) US3812902A (de)
CH (1) CH528315A (de)
DE (1) DE2062318A1 (de)
IT (1) IT940481B (de)
NL (1) NL7115070A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3315859A1 (de) * 1983-04-30 1984-10-31 Klein, Schanzlin & Becker Ag, 6710 Frankenthal Verfahren zur herstellung von giessereisandformen und vorrichtung zur durchfuehrung des verfahrens
US20220126392A1 (en) * 2020-10-23 2022-04-28 Health Pro Supplies Limited Ultrasonic welding mold for mask machine capable of quickly changing customized patterns

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2575684B1 (fr) * 1985-01-09 1987-02-06 Leroy Somer Moteurs Procede et dispositif de moulage en serie de pieces de fonderie

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US459102A (en) * 1891-09-08 Forming sand beds for molds
US865511A (en) * 1906-09-19 1907-09-10 George P Mehaffey Machine for making foundry-molds.
US1072229A (en) * 1912-08-31 1913-09-02 Herbert Harris Hoose Molding-machine.
US1083546A (en) * 1912-10-29 1914-01-06 Snead & Co Iron Works Method of ramming sand molds.
US3628593A (en) * 1970-05-06 1971-12-21 John Staley Mold forming compactor with selectively variable hydraulic pressure means

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US459102A (en) * 1891-09-08 Forming sand beds for molds
US865511A (en) * 1906-09-19 1907-09-10 George P Mehaffey Machine for making foundry-molds.
US1072229A (en) * 1912-08-31 1913-09-02 Herbert Harris Hoose Molding-machine.
US1083546A (en) * 1912-10-29 1914-01-06 Snead & Co Iron Works Method of ramming sand molds.
US3628593A (en) * 1970-05-06 1971-12-21 John Staley Mold forming compactor with selectively variable hydraulic pressure means

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3315859A1 (de) * 1983-04-30 1984-10-31 Klein, Schanzlin & Becker Ag, 6710 Frankenthal Verfahren zur herstellung von giessereisandformen und vorrichtung zur durchfuehrung des verfahrens
US20220126392A1 (en) * 2020-10-23 2022-04-28 Health Pro Supplies Limited Ultrasonic welding mold for mask machine capable of quickly changing customized patterns

Also Published As

Publication number Publication date
IT940481B (it) 1973-02-10
CH528315A (de) 1972-09-30
DE2062318A1 (de) 1972-05-10
NL7115070A (de) 1972-05-09

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