US1992241A

US1992241A - Machine for centrifugal casting

Info

Publication number: US1992241A
Application number: US555464A
Authority: US
Inventors: William D Sargent; William A Geisler
Original assignee: DURAFER
Current assignee: DURAFER
Priority date: 1931-08-06
Filing date: 1931-08-06
Publication date: 1935-02-26
Anticipated expiration: 1952-02-26

Description

Feb. 26, 1935.

A w. D. sARGENr Erm.. .1,992,241

MACHINE FOR CENTRIFUVGAL CASTING 2 sheets-sheet 1 Filed' Aug. 6, 193i @wauw IZWHiAITORNEYS lfpe. 26, 1935. w D; SRGENT Er AL 1,992,241

MACHINE FOR CENTRIFUGAL CASTING Filed AHE- 6. 1.931 2 Sheets-Shed 2 blk* l 3f Z Z' l u A6.

/ l a o v -3 55 l Illiam ,Salgari @ad llliam 7. eislefg,

' marmi'v 110mm l Patented Feb. 2s, 192.5'

I UNITED STATES PATENT OFFICE 1,992,241 MACHINE FOB CENTRIFUGAL CASTING William D. Sargent, New York, N. Y., and Wil- The chines liam A. Geisler, Newark, N. J., assi gnors, by

mesne assignments, to Durafer (Ina), Dover, Del., a corporation of Delaware Application August 6,1931, Serial No. 555,464 12 Claims. (Cl. 22-85) present invention relates to molding maand methods of casting articles centrifugally, and embodies, more specically, an improved molding machine wherein the centrifugal 5 molding operations are greatly simplified to enable a tained, together with a maximum elciency of maximum rate of production to be maineach molding operation.

More particularly, the invention embodies an improved molding machine and method of casting, centrifugally, liners for brake drums, although the invention is applicable to the manufacture of many articles whereinthe properties of centrifugally cast metal are desired and the character of the articles such as to adapt them to be cast centrifugally. Brake drum liners may either be formed with a slight draft, of uniform It is contemplated, by the present invention, to

provide an improved molding machine for casting these liners centrifugally at a rapid rate, the machine being of such character as to enable the mold to be quickly and easily stripped from the casting, the pouring and associated operations in connection with the casting of liners being effected Mor a cent ported upon a horizontal plane and actuated in a correspondingly easy manner. e particularly, theh invention is embodied in rifugal mold which is capable of being supmechanically by the operator.

An object of the invention, accordingly, is to provide an improved mold for casting articles centriiugally, wherein the article may be effectively removed from the mold.

A further object of the invention is to provide a mold of the above character wherein the mold may b latter which A further object of the invention is to provide e eifectively stripped from the casting, the being readily removed from the table upon it is cast.

an improved mol ticles,"

for centrifugally casting arthe mold being formed by centrifugal cast- A further object of the invention is to provide a centrifugal mold which is simple in construction, light in weight, and adapted to be readily operated manually to enable molding operations to be effected rapidly and the castings removed from the mold vby stripping the latter therefrom.

A further object of the invention is to provide an improved method oi' casting articles centrifugally, wherein the casting 'is eiected in a horizontal plane and the mold is stripped from l0 the casting, leaving the casting resting upon the horizontal table.

Further objects of the invention, not specifically enumerated above, will be apparent in connection with the following description, in which refl5 erence is made to the drawings, wherein:

Figure 1 is a view in section, taken through the axis of a molding machine constructed in accordance with the present invention, as indicated byline l-lof Figure 2, and looking inthe direction of the arrows.

Figure 2`is a plan view of a molding machine constructed in accordance with the present invention.

Figure 3 is a view similar to Figure l, showing 25 the modified form of mold constructed in accordance with the present invention. u

Referring to Figures 1 and 2, a mold foundation is illustrated at 10, and may be provided with a recess l1, in which an electric motor, or other suitable mold rotating means, 12 is provided.

The mold consists of a horizontal table 13, which is formed with a concave upper surface 14 to form a pouring plate. This pouring plate causes the metal to climb upwardly and be directed into the mold to fill the same almost instantaneously. The table is connected at 16 to the motor shaft 17, and is thus adapted to be driven directly from the motor. It will be seen that the foregoing construction affords a space between the table and the motor, whereby ventilation of the latter may be effected. This is important in view of the fact that, during operation of the machine, the table becomes heated and unless suitable provision were made for cooling the motor, dangerous overheating thereof would result.

In the form ofA machine shown in Figure 1, the mold is of such character as to form a circum. ferential rib upon the outer surface of the article, such outer surface tapering'up to the base of the rib. In order that this article, after being molded,

'may be eii'ectively removed from the mold, the

is bolted to a mounting ring 20' by means of bolts 20', and the extremity thereof is suitably tapered to form the desired profile on the extremity of the article.

The upper section 19 is formed with a flange 21 and a recessed portion 22, which is adapted to engage the upper surface of the lower portion 18 to provide a fluid tight fit. A longitudinally disposed groove 23 is formed in the upper section, and a peripheral flange 24 is provided to define the thickness of the article to be molded. Suitable handles 25 may be provided to facilitate the removal of the upper section 19 of the mold from the cooperating section, and keepers 26 are provided to secure the upper section inthe position shown in Figure 1. Springs 27 may be provided to urge the keepers yieldingly into the position shown in Figure 1, and cam faces 28 may be formed on the keepers to enable the upper section 19 to be automatically latched in molding position upon the positioning of the upper section upon the lower section 18.

In order that the upper section may be stripped effectively from the casting, a plurality of axially movable lifter rods 29 are slidablyv mounted in bushings 18' formed on the lower section 18. Each rod 29 is connected to a carrier 31 which is disposed below the table 13.

The carrier 31 and the rods 29 are elevated by means of a lever 32, which is provided with a forked extremity 33, having rollers 30 to engage the carrier 31 at a ,plurality of positions. The lever 32 is pivoted on the foundation 10 by means of a bracket 34, and spring 35 normally urges the forked extremity 33 downward with the carrier 31. A treadle 36 is mounted on the lever 32, and thus facilitates the manual operation of the mold. Brackets 40 are carried on the motor and pivot arms 41l thereon intermediate the ends thereof.

Rollers

42 and 43 are journalled on the ends of the arms 41 to engage the

rings

20 and 31, respectively. Ring 20 is formed with an outer rack 44 and ring 31 isformed with an inner track 45, the

respective rollers

42 and 43 engaging these tracks to facilitate the operation of the machine. Thus when the annular member 31 is raised by operation of the treadle y36, the diametrically oppositely disposed levers 41 are rotated by reason of the engagement of rollers 43 with the web 45 of the annular member 31, and as a result thereof roller 42 on the other extremity of levers 41 engage the web 44 of annular member 20 and cause the same to lower.

In the construction shown in Figure 3, a4 horizontaltable 50 receives a mold 37 which is adapted to form an articlewith a uniform exterior surface. This mold 37 is elevated by means of lifters 38, which are secured to a carrier 39, in a fashion similar to the corresponding elements in the construction shown in Figure 1. The means for elevating the mold may be similar to the corresponding means described in connection with the construction shown in Figure 1, only so much of such construction being utilized as is necessary to elevate the mold'. It has been found that the serviceability of the'construction described above is materially improved by forming the mold by centrifugal casting operations. The invention, therefore, further contemplates the construction of the mold sections, above referred to, by centrifugal casting operations, the metal used 'therein being of a special heat resistant alloy to impart the desired characteristics to the mold. For example, nickel and chromium form a suitable the provision of a centrifugally cast mold materially improves the operation thereof.

To render the casting operations more emcient and effect a substantially continuous operation with the machine, a heat balance is maintained between the mold, pouring plate and casting. It

has been found that the foregoing results are obtained by providing substantially six times the volume of metal in the mold as that of the casting, and where the sizeof the castings is substantially the same in surface area, this proportion of cross-sectional area between the mold and casting gives excellent results. This proportion must be greater than one but may vary, within limits, depending upon the apparatus and conditions attending different operations.

To determine the thickness of the casting, and hence the volume of metal therein, the lip or fiange 24 is formed on the mold, the depth ofv the lip being a measure of the volume oi' the metal in the casting. 1 i

While the invention has been described with specific reference to the constructions shown in' the accompanying drawings, it is not to be limited save `as defined in the appended claims.

What we claim is:

1. A machine for castingcentriflugally comprising a, horizontal table. means to rotate the table, a mold on the table, means carried by the table to elevate the mold from the table, and stationary means to actuate the elevating means.

2. A machine for casting centrifugally comprising a horizontal table, means to rotate the table, a mold on the table, means carried by the table to elevate the mold from the table, means on the table to secure the mold thereto, and stationary means to actuate the elevating means.

3. A machine for casting centrifugally com-- prising a horizontal table, means to rotate the table, a mold carried by the table, elevating means for said mold extending below the table, means to secure the mold to the table, and stationary means for engaging said elevating means to elevate said mold.

4. A machine for casting centrifugally comprising a rotatable pouring plate, a plurality o f mold sections associated therewith, means to elevate one of the sections from the plate, and means to depress another of the sections below the plate. v

5. A machine for casting centrifugally comprising a rotatable pouring plate, a plurality of mold sections associated therewith, means to simultaneously elevate one of the sections from the plate and to depress another of the sections below the plate.

6. A machine for casting'centrifugally comprising a rotatable pouring plate, a plurality of mold sections associated therewith, means to elevate one of the sections from the plate, and means actuated by the last named means to depress another ofvthe sections below the plate.

'7. A machine `for casting centrifugally comprising a rotatable` pouring plate, a plurality of the plate and form a substantially fluid tight mold sections coaxial with the plateand rotatable therewith, means to move the sections ax- Iing an inwardly flaring lip to engage the lip on the plate and form a substantially iuid tight joint therewith, an upper mold section4 seated on the lower section, cooperating surfaces between the sections to form a substantially uid tight joint therebetween, means to elevate the upper section, and means to depress the lower section;

9. A machine for casting centrifugally comprising arotatable pouring plate, an outwardly flaring lip on the plate, a lower mold section having an inwardly flaring lip to engage the lip on the plate and form a substantially fluid'tight joint therewith, an upper mold section seated on the lower section, cooperating surfaces between the sections to form a substantially uid tight joint therebetween, means to elevate the upper. section, means to depress the lower sectionand means to actuatethe last named. means. 4

10. A machine for casting centrifugally comprising a rotatable pouring plate, 'an outwardly ilaring lip on the plate, a lower mold section having an inwardly aring lip to engage the lip on joint therewith, an upper mold section seated on the lower section, cooperating surfaces between the sections to form a substantially fluid tight joint therebetween,` means to move the upper section, means to move the lower section, means between the last named means to cause axial movements of the4 last named means in opposite directions, and means to actuate the moving means.

. 11. A machine for casting centrifugally about a vertical axis comprisinga lower horizontal mold member, an upper horizontal mold member engageable therewith, bushings spaced around the outer edge of said lower mold member, vertical extending rods slidably-arranged in said bushingand flxed to a radial ange on the lower edge of the upper mold member, an annular horizontalllanged ring secured to the lower ends of said rods and stationary means having rollers engaging said flanged ring adapted to lift said upper mold member.

` 12. A machine for casting centrifugally about a vertical axis comprising a lower'horizontal mold member, an upper horizontal mold member engageable therewith,.bushings spaced around the outer edge of said lower mold member, vertical extending rods slidably arranged in said bushing 'and fixed to a radial flange on the lower `edge of the upper mold member, an annular horizontal flanged ring secured tothe lower ends of said rods, stationary means having rollers engaging saidl flanged ring adapted to lift said upper mold member, and spring pressed latches ,pivotally secured to said llower member and