US1324021A - Pouring-head and skim-gate fob castings - Google Patents

Description

W. J. ALFORD.

POURING HEAD AND smm GATE FOR CASTINGS..

APPUCATION FILED JULY 17,1919.

Patented Dec. 9,1919.

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i To all whom z't-may concern:

Be. it known that I, WILLIAM J. ALFORD,.

WILLI M J. ALFORD, or BIRMINGHAM, ALABAMA.

. POURING-HEAD a citizen of the United States of America, residing at Birmingham, in the county of Jefferson and State'of Alabama, have in vented certain new and useful Improvements in Pouring-Heads and Skim-Gates for Castings, of which the following is a specification.

The object of my invention is-to provide a new and improved type of pouring head and skim castings.

A further object of my invention is to "produce a' sound casting free of (lll't' by designing the skim gate or gates to strain out the sand and slag from the mold cavity proper and this is accomplished by radially I so narrowing and circumferentially elongating the skim gate toward its point of discharge into the mold cavity until it will act to prevent the entrance thereinto of sand and sla in important advantage gained by the reduction in the width or radial dimension of the gate at its lower end is that I thus feature of my invention and is in the form of a symmetricalbody having-draft to be confine the junction between the gate and casting to the zone of metal which is bored out of the hub in hollow castings, such as wheels, thus enabling me to remove all trace of the gate without chipping or grinding. A further object of my invention is to so design the gate or gates which may vary I in number, as may be. desired, so that each will have substantially uniform cross sectional area throughout its length but which I toward its discharge end will be gradually .reduced in width or radial. dimension and proportionally increased .circumfere'ntially of the print to compensate for the reduced width. l

A further object of my invention is to provide a short skim gate adapted to. contain only a small body of metal which will not set quickly but will tend to draw down from the large body of molten metal in the head or pouring basin ample metal to fill out the casting. By reason of this function of the skim gates I am enabled to materially reduce the volume of metal in the head and to materially decrease the cost of manufacture.

My invention also comprises the novel details of construction and arrangements of parts, which in their preferred embodiment "segzmcation of Letters Iatent.

. sand.

gate for use inthe art of making AN'D SKIN-GATE FOB CASTINGS.

Patented Dec. 9, 1919.

v Application filed July 17, 1919. Serial No. 311,835.

' only are illustrated in the accompanying drawings, in which Figure l is a sectional view through a mold with a pattern, gate print and pour, ing head print rammed in position inthe Fig. 2 is a top plan view of the core print 1n forming the skim gates. 1 Fig. 3 is a bottom plan view of the pour- A ing head.

Fig. 4: is a detail view of the sand core to be used.

Similar reference numeralsrefer to similar parts throughout the drawings.

In the embodiment of my invention illustrated, I show'a mold for casting car wheelscomprising a drag 1, chill 2, cope 3, pour- 1ng basin 4, and a pattern 5, all of 'which parts are of standard construction and may be widely varied to suit the difi'erent'classes of work. The pattern in its top surface is provided with a center socket to receive a dowel 6 depending centrally from the base of the core print 7 and thus serving to center the core print on the pattern.

The core print forms the most important drawn downwardly from the cope and having in its circumferential side wall any desired number of grooves or depressions which leave between them the prints for the formation of the skim-gates.

Referring to Fig. 2, in which the core print is illustrated. in plan view, the skim.

gate prints 8 are all similar and ach comprises a circumferential outer wall 9 extend-' ing from the base to the top of the print is thus defined by the walls 9 and 10 skim gate prints which are separated by. upwardly and inwardly sloping depressed surfaces or walls 11 which if protected for a complete circle would produce a truncated cone. The skim gate prints formed by the projec tions Sbeyond such an imaginary cone are symmetrical and are substantially uniform in cross sectional area horizontally considered and they increase in radial thickness toward the top wall and decrease correspondingly in width. The circle formed by the imaginary base of the coneis of equal diameter with the main body of the sand core 12 and the circle formed-by the top of the imaginary cone is of equal diameter with the tapered top surface 13 of the cone,

the top end of the cone being tapered to correspond to the taper of the imaginary truncated print cone.

The core print has a central hole 14 therethrough and also has a-triangular countersunk socket 15 for the reception of a triangular boss 16 on the underface of the pouring head print 17, which is in the form of a, cylinder except as reduced for draft and the lower end-of this print is provided with upwardly tapering recesses formed by inner circumferential walls 18- and o 11twardly flaring and. upwardly tapering side walls. 9. vThe sloping walls 18 gradually merge into the cylindrical surface of the print and as a result of this arrangement:

the lower end of the print conforms exactly 7 in shape to the top surface of the core print on which it-is centered so that the undisturbed sides of the pouring head print form vertical continuations of the skim gate prints 8. v

In producing a mold in accordance with my invention, after the drag has been rammed the cope and the core print 7 are mounted in place and then the pouringv basin is set in position and the curing head prlnt is set down on the core prlnt. The ramming of the cope and pouring basin will then proceed in the usual manner, after which the pouring gate print is drawn vertically, a screw rod is inserted through the hole 14 in the skim gate print, and the cope and pattern are stripped from the drag. The pattern is then stripped from the cope and the core print is drawn, after which the cope and drag are reassembled previous to which the sand core 12 is set in the print provided thereforin the drag. At the completion of.

these operations the pouring gate or basin will be closed at its lower end by the top of the sand core 12 except for the wide and relatively narrow skim gates formed by the prints 8 in the sand, which gates conforming in shape to the gate prints are radially wide and circumferentially narrow at their upper ends, while at their lower ends they are circumferentially elongated and reducedradially to narrow openings which are closed on their inner sides by the taper walls in the top 13 of the sand core. As a result of this feature of my invention that the gates, whatever their sha e or relative arrangement or number, shou d have their discharge ends 5. confined to a zone which willbe bored out in forming the hub bore of the wheel or like casting to thereby avoid chipping.

The utilization of my invention avoids many very serious difliculties and disadvantages which have heretofore prevailed in connection with the forming of skim gates for castings of the general character described; Y

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

l. A mold for castings having a cavity formed for the pouring head and having relatively short skim gates leading therefrom into the mold, said gates decreasing in radial width so as to have a narrow, restricted laterally elongated discharge opening.

2; A mold forv wheel castings having a cavity formed for the pouring head and having relatively short skim gates leading therefrom into the mold, said gates decreasing in radial width so as to have a narrow restricted laterally elongated discharge open ing disposed to overlie the zone to be bored out of the casting hub.

3. In a molding apparatus, a core print having marginal depressions extending from top to bottom, each depression having a side wall which slopes outwardly and increases in width downwardly, and having end walls which decrease in width downwardly.

4. In a molding apparatus, a core print in the form of a truncated cone having a plurality of axial skim gates forming patterns projecting from its side wall, said projecting patterns, where they intersect the bottom plane of the cone, belng radially narrow and circumferentially elongated, and where they intersect the top plane of the cone being substantially increased in width radially and relatively shorter-circumferentially.

5. In a molding apparatus, a core print in the form of a short truncated cone having a plurality of axial grooves in its marginal wall for the formation of outstanding skim gate patterns, said grooves where they inter sect the bottom plane of the cone being radially narrow and circumferentially elongated, and where they intersect the top plane of the cone being relatively shorter circumferentially and deeper radially, in combination with a pouring head in the form of an inverted truncated cone having its base conforming in shape to the top of the core print andgradually changing upwardly to a circle in transversecross section, and means to center the pouring head on the y print.

6. .In an apparatus for molding car wheelsand the like, a drag, a chill, a cope, a cope basin, a core print adapted to be drawn downwardly from the cope, a pouring head print adapted to be drawn upwardly from the cope basin, means to center the abutsand core having its upper end adapted to close the lower end of the pouring head cavity without obstructing said skim gates.

7. A mold for casting wheels and the like having a cavity formed for the pouring the pattern during the ramhead and any desired number of gates leading therefrom into the mold cavity and confined at the point of entry into the mold cavity to the zone adapted to be bored out of the casting hub.

8. A mold for wheel castings having a pouring head and a plurality of skim gates leading marginally therefrom into the mold cavity for the wheel, the discharge ends of said gates being curved and narrow and disposed in line with the zone of the wheel hub which is bored out to form the hub bore.

In testimony whereof I aflix my signature.

' v WILLIAM J. 'ALFORD.

Witness NOMIE WELSH.

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