US2781564A

US2781564A - Centrifugal sleeve casting mold

Info

Publication number: US2781564A
Application number: US365627A
Authority: US
Inventors: Harold N Meyers
Original assignee: Sealed Power Corp
Current assignee: SPX Corp
Priority date: 1953-07-02
Filing date: 1953-07-02
Publication date: 1957-02-19
Anticipated expiration: 1974-02-19

Description

Feb. 19, 1957 H. N. MEYERS 2,781,564

CENTRIFUGAL SLEEVE CASTING MOLD Filed July 2, 1955 FIG. I

ATTORNEY United States Patent ()fi lice 2,781,564 Patented Feb. 19, 1957 2,781,564 7 CENTRIFUGAL SLEEVE CASTING MOLD HaroldN. Meyers, Muskegon, Mich., assignor to Sealed .Power Corporation, Muskegon, Mich, a corporation of Michigan Application July 2, 1953, Serial No. 365,627

1 Claim. (Cl. 22-1135) This invention relates to a novel and very practical and useful mold for centrifugally casting elongatedsleeves which, while they may be used for various purposes, in practice are used to a large extent as liners of cylinders of internal combustion engines.

In the centrifugal casting of such sleeves, the mold of cylindrical form is lined with a suitable lining of sand or mixture of silica flour and a binding clay, and the molten iron is poured into the mold while it is rapidly rotated about its longitudinal axis, the molten iron, under centrifugal action, spreading evenly over the inner surface of the mold; and a sleeve casting, after the molten iron has solidified, is produced of substantially uniform thickness. The casting is removed from the mold and the mold reused for the production of succeeding castings, one after another.

With my invention, one end of the mold is open so that the cast sleeve may be removed from the mold after it has solidified. An object and purpose of the invention is to provide a novel closure end and means for releasably securing it snugly in place during the casting operation, but which is quickly and readily removed after the casting has solidified, and then replaced for a subsequent relining of the mold with its liner. Furthermore, with my invention, in the use of end casting protecting members between the molten iron and one end of the mold and between said molten iron and the closure for the opening at the other end of the mold, a novel means of holding the end protector at the open end of the mold is provided, such that it is securely gripped and held in place when the closure to the open end of the mold is secured in place.

Other objects and purposes than those stated, and novel structure for attaining the same will be understood from the following description, taken in connection with the accompanying drawing, in which,

Fig. l is a perspective view showing the mold of my invention with the open end closure in place, and with an illustration of the manner in which such closure is secured in place or removed.

Fig. 2 is a perspective view of a novel tool which is used in the securing and in the removal of such end closure.

Fig. 3 is a central longitudinal section through the mold with the end closure in place thereon, and

Fig. 4 is a somewhat enlarged, fragmentary plan view of the open end of the mold to which the closure is detachably secured.

Like reference characters refer to like parts in the different figures of the drawing.

The mold 1 is of a cylindrical form and of a designed length for the length of cast sleeve which is to be produced. It has an integral end 2 which preferably has a central opening 3 thercthrough. At the inner side of the end 2 and around said opening, an annular rib 4 is provided, around which is a ring 5 of thin asbestos paper or equivalent material which is protective of the inner end of the casting produced in the mold, keeping it from chilling by eliminating contact with the end 2 of the mold. Such ring member 5 has an exterior diameter very slightly in excess of the interior diameter of the mold 1 and the. opening to the ring 2 is such that it snugly engages the outer surfaces of the inwardly extending rib 4;

The opposite end of' the mold is open and is provided with an annular recess, the interior diameter of which is less than the exterior diameter of the mold but greater than its interior diameter (Fig. 3 At such open end of the mold'two' bars 6 are bolted or otherwise permanently' secured, being spaced at one end thereof from the mold by filler blocks 7; Bolts pass through the bars and blocks 6 and 7 into the adjacent end of the mold 1 (Fig. 4). Such blocks are greater in thickness at one end than the other, the free end portions of the bars 6 being spaced progressively greater distances from the end of the mold from the blocks-7 to the outer free ends of such bars as shown.

Two of such bars 6 are located, one at one side of the mold and the other diametrically opposite, and one of such bars 6, near its free end, has a thumb screw 8 threaded therethrough, as best shown in Fig. 4.

The closure for the open end of the mold comprises a closure ring 9 of an exterior diameter such that it is received within the annular recess at the open end of the mold. It has a central opening 10 therethrough through which molten iron is deposited within the mold. Around said opening 10, at the inner side of the closure 9, is a continuous annular rib 11 surrounding which is a second ring 12 of thin asbestos paper or equivalent heat insulating material, like that used for the ring 5. The peripheral edge portions of the ring 12 are between the closure member 9 and the shoulder at the bottom of the annular recess in the open end of the mold; and such ring surrounds the rib 10 as shown in Fig. 3.

At the outer side of the closure member 9, two are shaped bars 13 are bolted, each in the arc of a circle and each somewhat less than degrees in length, thereby providing two diametrically opposed gaps 14 between the adjacent ends of the members 13. The spacing of the are members 13 from the outer side of the closure member 9 is by spacing collars 15 through which the attaching bolts or set screws pass.

Two diametrically opposed radially extending bars 16 are secured, one at each side of the opening 10 through the closure member 9 and are adapted to ride within and against the inner sides of the bars 6 secured to the mold. The sides of the oppositely extending bars 16 which ride against the bars 6 are inclined at the same angle as the inner side of the bars 6 is to the vertical plane of the end of the mold 1. it is apparent that when the closure memher is put in place, the bars 16 are beyond the free ends of the bars 6 and that by turning the closure member 9 in a clockwise direction (Fig. l), the bars 16 may be brought behind the keeper bars 6 and the closure member 9 forced into snug closed position gripping the casting end protector member 12 between it and the adjacent shoulder of the mold. Such connection is made with the screw 8 turned outwardly so that its inner end will not be in the path of movement of one of the bars 16. After the closure member is secured in place such screw 8 may be operated to move its inner end into a position which will block disconnection of the closure member 9 from the mold.

For manual handling of the mold closure member 9, a tool such as shown in Fig. 2 is provided. It includes an elongated handle 17 at one end of which a ring member 18 and a cross bar 19 are secured, the bar 19 directly to the handle 17 and the ring member to the cross bar. The ring member 18 has an opening at one side as shown in Fig. 2.

Such tool is attached to the end closure 9 by passing the endportions of the bar 19 through the gaps 14, and then turning the handle 17, by pressure upon the cross handle member 20, in a clockwise direction. The edges of the bar 19 will come against collars 15 and cause a turning of the closure 9 in a clockwise direction, thereupon swinging the bars 16 into operative engagement with the keeper bars 6, as in Fig. 1.

After such attachment, the handle is removed by reverse turning movement until the ends of bars 19 come to the gaps 14 whereupon the mold, as in Fig. 3, is ready to receive molten iron therewithin, a suitable lining of the interior or the mold between the end protecting members 5 and 12 being applied before metal pouring takes place. In casting, molten iron is deposited in the mold which is rapidly turned about its longitudinal axis. The iron spreads evenly over the interior of the mold and against the lining therein and against the end protector members 5 and 12. The melted iron solidifies in a sleeve of substantially uniform thickness and with neither end nor surface portions chilled or hardened.

To remove the casting, the end closure member 9 is removed by connecting the handle with it and turning it in a reverse or counterclockwise direction, whereupon the closure is removed with the handle. The thickness of the bar 19 is such that when the end portions thereof are between the are members 13 and the outer face of the mold, a fairly snug fit obtains so that the mold closure 9 is not likely, acidentally or otherwise, to be disconnected. The exterior diameter of the ring 18 is slightly less than the diameter of the arc bars 13, pro- 4 viding a guidance for the handle member when it is being connected to the lower end closure and is operated to secure it in place or disconnect it from the mold. The structure described has been made and used and thoroughly tested and tried. It operates in an especially satisfactory manner.

The invention is defined in the appended claim and is to be considered comprehensive of all forms of structure coming within their scope.

I claim:

A cylindrical mold having an open end, spaced keeper members fixed to said mold at its open end having free end portions spaced from said open end of said mold, a closure having a central opening therethrough seated against the mold at said open end thereof, members, one for each keeper member, secured to said closure and extending generally radially outward beyond the closure, movable on rotative movement of said closure to between said keeper members and the adjacent end of the mold, or to disengage from said keeper members, and a pair of are shaped bars of like radius of curvature secured to and spaced from the outer side of the closure, said bars at adjacent ends having gap between them.

References Cited in the file of this patent UNITED STATES PATENTS 1,480,000 McWane Jan. 8, 1924 2,218,188 Wittenberg Oct. 15, 1940 2,518,055, Olsen et al. Aug. 8, 1950