Metal founding – Process – Shaping a forming surface
Patent
1982-12-08
1986-03-18
Godici, Nicholas P.
Metal founding
Process
Shaping a forming surface
164 71, 164 12, B22C 900
Patent
active
045762155
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method of and apparatus for the production of frozen mould bodies which include granular material and a binder.
The use of a neutral binder, such as water, and a neutral coolant, such as liquefied nitrogen for freezing the water, totally obviates the environmental pollution which the use of conventional binders and catalysts has produced. It moreover reduces the manufacturing costs and allows the sand to be reused without subsequent treatment.
The known embodiments of the present method, by which the coolant is sprayed or poured into or on the mould body, suffer from the drawback that it takes a relatively long time to freeze the water to a sufficient depth; the object of the invention is to eliminate or significantly reduce this drawback.
The object is achieved in carrying out the method by drawing suction through a porous sand mass to increase significantly the rate at which the freezing agent can be caused to contact the binder in the mould body, resulting in a corresponding reduction in the time required for freezing and additional cooling to the necessary depth.
In an embodiment which provides for rapid penetration of the freezing agent into the mould bodies and which is used in connection with a mould string, the freezing medium is passed direct to the mould faces which later contact the molten metal.
The invention also concerns apparatus or a plant for use in the carrying out of the method, in which freezing is effected in the mould box.
The invention also concerns a mould production apparatus or plant in which the moulds are not frozen until they have left the mould box and have been pushed out on a mould path, and which includes a nozzle assembly mounted so that a vacuum tunnel can be closed by simple means simultaneously with the nozzle assembly being in its operative position between the exposed mould faces.
Embodiments of apparatus or plant in accordance with the invention will be described more fully below with reference to the drawing, in which:
FIG. 1 schematically shows an apparatus or a plant, in accordance with the invention as seen from the side and partly in section, with a nozzle assembly in its operative position,
FIG. 2 is a cross-sectional view taken along the line II--II in FIG. 1, with the nozzle assembly in its inoperative position,
FIG. 3 is a schematical top view of the plant of FIG. 1 on a reduced scale.
FIG. 4 is a schematical cross-sectional view of a moulding apparatus in accordance with another aspect of the invention, and
FIG. 5 is a schematical cross-sectional view of another moulding apparatus in accordance with the aspect of the invention shown in FIG. 4.
In the drawing, 10 represents a pattern plate fitted on the piston rod 11 of a hydraulic cylinder (not shown) of a known moulding apparatus or mould producing machine, which moulds and presses each mould between two vertical pattern plates in a frame (not shown), and then one pattern plate is pivoted to a horizontal position and the other pushes the produced mould 12 out of the frame and forwardly to the position shown in FIGS. 1 and 3 on a mould path 13 by means of the hydraulic pressing cylinder. The pattern plates produce mould impressions 14 and impressions 15 which upon juxtapositioning of the moulds form mould cavities and ingates and sprues between each pair of adjacent moulds 12. The said position of the newly formed mould 12 provides a space 24 between this mould and the rear mould in the mould row 16 formed by the previously produced moulds on the mould path 13.
The rear end of the mould row 16 and the last-formed mould 12 are surrounded by a vacuum and cooling tunnel 17 defined by two side walls 18, a top wall 19 and a bottom 20 of heat insulating material. The bottom 20 constitutes a part of the mould path 13 and supports a slide plate 21 on which the moulds 12 can rest and slide. Gaskets 22 are provided at the ends of the tunnel 17, and they extend from the side walls 18 and the top wall 19 towards and resiliently and sealingly engage the mould row 16 and edge faces of the patte
REFERENCES:
patent: 3749151 (1973-07-01), George et al.
patent: 3888299 (1975-06-01), Bardet
patent: 4150704 (1979-04-01), Hoult
Patent Abstracts of Japan, abstract of JP 55-84250, publ. 06-25-1980.
Patent Abstracts of Japan, abstract of JP 56-6754, publ. 01-23-1981.
Patent Abstracts of Japan, abstract of JP 56-47240, publ. 04-28-1981.
Patent Abstracts of Japan, abstract of JP 56-47241, publ. 04-28-1981.
Dansk Industri Syndikat A/S
Godici Nicholas P.
Rowan Kurt
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