US2914805A - Apparatus for producing superimposed castings between three relatively movable dies - Google Patents

Description

Dec. 1, 1959 L H MORIN APPARATUS FOR PROD UCiNG SUPERIMPOSED CASTINGS BETWEEN THREE RELATIVELY MOVABLE DIES Filed April 25, 1955 2 Sheets-Sheet 1 INVENTOR.

LOUIS H. MORIN ATTORNEY.

Dec. 1, 1959 H. MORIN 2,914,805

APPARATUS R onucl SUPERIMPO CASTINGS BETWE Filed April 25, 1955 T E REL VELY MOVA DIES 2 SheetsSheet 2 INVEN LOUIS H.

ATTORNEY.

TOR.

MORIN.

APPARATUS FOR PRODUCING SUPERIMPOSED CASTINGS BETWEEN THREE RELATIVELY MOVABLE DIES Louis H. Morin, Bronx, N.Y., assignor to Coats & Clark Inc., New York, N.Y., a corporation of Delaware Application April 25, 1955, Serial No. 503,467

1 Claim. (Cl. 18-42) This invention relates to theproduction of multiple or United States Patent superimposed cast or moulded products in such manner as-to adapt a relatively small capacity machine to a higher production speed, while maintaining the standard of the hydrostatic pressure required in operation of the small machine, thereby economically producing the resulting products by virtue of the increased production [capacity of the machine.

More particularly, the invention deals with a machine of the character described, wherein a pair of opposed relatively movable dies are employed in conjunction with an intermediate die movable across the path of movement of such pair of dies, in the operation of forming the cast or moulded products and removal of the same from the machine, and particularly, wherein the gating for cavities disposed upon opposed surfaces of the intermediate die is across an outer surface of said intermediate die.

The novel features of the invention will be best understood from the following description, when taken together with the accompanying drawing, in which certain embodiments of the invention are disclosed and, in which, the separate parts are designated by suitable reference characters in each of the views and, in which:

Fig. 1 is a diagrammatic sectional view through three dies, illustrating formation of cast products on opposed surfaces of one of said dies.

Fig. 2 is a diagrammatic sectional view, showing all of the dies in relative position to each other and indicating the method of releasing the cast products from opposed surfaces of an intermediate die, the section of Fig. 2 being substantially on the line 22 of Fig. 1.

Fig. 3 is a detail sectional view, similar to Fig. 1, showing only a part of the construction and showing a modification; and

Fig. 4 is a diagrammatic perspective detail view of a modified form of independent die for producing other types of cast products.

In the formation of cast and moulded products, the use of what are generally referred to as multiple impression dies or moulds is quite common in the art. It is also known to employ a series of alined dies or moulds with impressions or cavities formed between adjacent surfaces thereof. With the multiple impression dies, particularly in the formation of relatively large diameter and, yet, small material volume members, such for example as rings, dies having large surface areas and requiring extremely high hydrosta'ticpressures are required, in order to produce such products.

I have conceived a simple, economical and practical method to increase the production capacity of a small capacity or area casting machine by employing a difierent die structure than heretofore used. This new die structure includes an intermediate die having alined or superimposed cavities which are completed by complementary cavities in a pair of alined relatively movable dies. The sprue or gate to the cavities is arranged on opposed surfaces of the intermediate die and extends across an outer surface thereof. With this construction, a single "ice .inating the necessity of constructing the much larger and more expensive machine to perform the desired result;

In Figs. 1 and 2, I have diagrammatically illustrated one adaptation of my invention and, in these figures, 10 and 11 represent a pair of opposed relatively movable dies which, for purposes of the present description, will be characterized as core dies. At 12 I have shown an intermediate die arranged between and enveloped by the dies 10 and 11, except where the intermediate die 12 extends through openings 13 and 14 in opposed surfaces of the dies 10 and 11, as clearly noted in Fig. 2 of the drawing.

The dies 10 and 11 have annular cavities 15, 15, substantially V-shaped in cross-sectional form, the cavities being partially formed by enlarged diameter disc-like core portions 16, 16', outwardly of which are reduced disclike core portions 17, 17'. Centrally of the portions 17, 17 are projecting core pin portions 18, 18', the latter extending into a central aperture 19 in the intermediate die 12, thus alining the die 12 upon the dies 10 and 1 1. The intermediate die 12 has, on its outer surfaces, annular impressions or cavities 20, 20. These impressions or cavities, in conjunction with the cavities 15, 15', result in the formation of two similar ring- like products 21, 21 of the cross-sectional contour shown, it being apparent that the inner bevelled surfaces 22, 22' and 23, 23 are formed by the discs 16, 16', 17, 17' respectively. It will also be seen that the inner surface 24, 24' of an inwardly extending annular flange 25, 25. of the rings is formed by part of the inner surface of the core discs 17, 17, as clearly apparent from a consideration of Fig. 1 of the drawing.

Formed between adjacent surfaces of the dies 10 and 11 and the outer surface 26 of the intermediate core is a gate or sprue passage 27, which opens into both cavities 15, 15' and out through the surfaces of the dies 10 and 11 to register with a nozzle passage 28 from a suitable source of pressure supply of the casting or moulding material employed. As these methods of pressure injection of the materials employed are all well known in the art, no detailed description or showing thereof is deemed to be necessary.

From the foregoing, it will be apparent that I employ what might be termed a gating which straddles an outer surface of the intermediate die. It will be noted, from a consideration of Fig. 2 of the drawing, that, when the intermediate die 12 is moved into spaced relationship to the dies 10 and 11, a pair of trimming tools or knives 29, 29' are actuated to trim the gates 30 from the two cast or moulded products, freeing said products for discharge into suitable receptacles, not shown, in the manner diagrammatically illustrated. in said figure.

After the trimming operation, the intermediate die 12 is returned to the position shown in Fig. 1, whereupon, the dies 10 and 11 are brought into engagement with each other and the die 12 and the next injection charge is performed in filling the die cavities in forming another pair of products 21, 21.

In Fig. 3 of the drawing, I have diagrammatically shown a slight modification, wherein an auxiliary gate removal strip 31 is employed on the side surface 26 of the die 12, which simply means that the gate 30' will have a larger yoke than the gate 30 and, here instead of the strip 31 can be moved outwardly with respect to the surface 26 in stripping or severing the gate 36' from the two cast or moulded products. It will be noted that the gate 30' has weakened portions, as at 32, to facilitate this operation.

In Fig. 4 of the drawing, I have shown a slight modification, simply to illustrate one of the many other uses and adaptations of my method and die structure and, in this figure, 33 represents, in perspective, an intermediate die, generally similar to the die 12, and having an alinement aperture 33' therein to receive core pins, similar to the pins 18, 18 to aline the die 33 with its companion dies, in order to provide proper registration of pairs of die cavities 34 on opposed surfaces of the die 33. With this construction, it will be apparent that two independently cast or moulded products 35, 35' will be formed simultaneously at each side surface of the die 33 and the gate or sprue 36 is modified only to the extent of having branch extensions 37 to the cavities 34. With this construction, it will be apparent that, in the severing or trimming operation, the gate or sprue 36 will be trimmed off along the lines 38. The cavities on one side only of the die 33 are shown, but it will be apparent that the opposed side of the die will have another pair of cavities which can be of the same contour as the cavities 34, or of different contour. In the construction shown, the products 35, 35' are identical and in the form of double hook members, similar to what are known as traveler rings. It will be understood, however, that two different types of products, that is to say, products of different contours could be made at each side of the die 33.

Having fully described my invention, what I claim as new and desire to secure by- Letters Patent is:

In a machine for simultaneously forming independent superimposed injection moulded products, an intermediate die, a pair of dies movable toward and from opposed surfaces of said intermediate die, means for alining the movable dies with said intermediate die, said intermediate die and movable dies having impressions on adjacent surfaces thereof collectively forming cavities of predeterined products to be formed, a sprue passage forming a gate extending across an edge surface of the intermediate die into the cavities on opposed surfaces of said intermediate die, whereby, in injecting heated material through said sprue, products will be simultaneously formed in cavities on opposed surfaces of said intermediate die, said intermediate die being movable across the path of movement of said movable dies, when the latter are in open position, in movement of the moulded products to a trimming station, and means for trimming the products to remove the gate therefrom and free the products from opposed surfaces of said intermediate die.

References Cited in the file of this patent UNITED STATES PATENTS mama

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