US372336A

US372336A - Peters

Info

Publication number: US372336A
Authority: US
Publication date: 1887-11-01
Anticipated expiration: 1904-11-01

Description

(No Model.) 3 Sheets-Sheet 1.

W.- $ELLERS. METAL MOLD FOR GASTING'STEEL WEBB-Ls. No. 372,336. Patented Nov. 1, 1887.

' 441V W4, WITNESSES: v INVENTOR ma 11L f 3 I $4M, j f

N. PEIERS, Pholo'lilhodhpher. Wnhingmn. 0.0.

(No Model.) '3 Shets-Sheet 2.

W. SELLERS.

METAL. MOLD FOR CASTING STEEL WHEELS. No. 372,336. Patented Nov. 1, 1887.

WITNESSES: A4 INVENTOR W /1 M1 I (7 WM, I 1

(No Model.) 3 Sheets Sheet 3.

'W. SELLERS. METAL MOLD FOR'GASTING STEEL WHEELS. No. 372,836. Patented Nov. 1, 1887.

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INVENTOR AA M052 WITNESSES 3 yflmmaw PATENT OFFICE.

WILLIAM SELLERS, OF PHILADELPHIA,

PENNSYLVANIA, ASSIGNOR TO WILLIAM SELLERS & COMPANY, INCORPORATED, OF SAME PLACE.

METAL MOLD FOR CASTING STEEL WHEELS.

SPECIFICATION forming part of Letters Patent Np. 372,336, dated November 1, 1887.

Application filed June 8, 1886. Serial No. 204,446. (No model.)

To all whom it may concern-.-

Be it known that I, WILLIAM SELLERs, a citizen of the United States, residing in the city and county of Philadelphia, in the State of Pennsylvania, have invented certain Improvements in Metal Molds for Casting Steel Wheels, of which the following is a specification.

In United States Letters Patent No. 319,515, granted to me under date of June 9, 1885, for a metal mold for casting steel wheels, I have shown and described a mold for casting all forms of wheels, in which the rim is connected with the hub by arms or by a plate or web that is narrower than the rim, but as perhaps the most important application of that invention I haveshown and described the same with' reference to the manufacture of railway wheels. In the manufacture ofall such wheels a sinking head must be provided at the hub where the metal is poured, which increases the height from which the metal must fall from the ladle into the mold when poured from above, and it is at this point that it is desirable to insert a baked sand core, but I have found it impossible to insert such a core with safety, before the metal is poured into such a mold, owing to the cutting of the core by the -molten metal and the spattering before referred to; in a sand mold closed at the-top so as to protect theupper end of the core or with an enlarged sinking head in such a sand mold so that the core could be supported above it, as well as at the bottom, this difficulty would not arise, but with a" metal mold, the sinking head must be no larger than the hub of the casting, otherwise the casting could not be removed from they mold, and if the core was passed entirely through such a sinking head,

the metal remaining on each side of the core would be so thin that it would not answer the purposes of a sinking head, as it would chill as rapidly or perhaps more rapidly than the other parts of the casting.

My present invention is designed to obviate the difficulty of coring the hubs of steel wheels cast in my metal mold, without impairing the efficiency of the central sinking head, by pro viding a construction whereby such core may be inserted under and into the molten metal after the latter has been poured into the mold from above, to such end my invention comprehends a metal mold provided with a movable annulus adapted for the casting of steel wheels, and devices for guiding and thrusting 5 5 into the mold from the under side a baked sand core; the operation of the mold comprehends the pouring of the molten metal into the mold from above until the sinking head is full, and the thrusting of a baked sand core from below into the molten metal up to the sinking head.

In order that this improvement may be clearly understood reference must be had to the drawings forming part of this specification, in which- Figure lrepresents avertical sectional elevation, through the axis of a metal wheel mold such as is shown and described in my above mentioned patent, and through the axis of the coring apparatus embodying-the subject mat- 7o ter of my present invention, the parts being represented in the positions which they occupy before the metal is poured into the mold, Fig.

2, being a view similar to Fig. 1, represents the mold as containing the metal forming a wheel, the sinking head at the hubs and at the rim, and the core, said core being represented as thrust up to said sinking head of the hub, into and through the metal which forms the hub of said cast wheel, Fig. 3 is a top plan through the cylindrical bed frame I of Figs.

1 and 2, section being supposed in the plane of the dotted line 00-00 of Fig. 2 and sight being taken in the direction of the arrows upon said line: Fig. 4. is a fragmentary perspective detail of the core, partly broken away to exhibit its contained shell, and Fig. 5 is asimilar view of the head of the core carrier, the core being removed so as to expose the nipple upon said head.

Similar letters of reference indicate corresponding parts The construction and operation of this wheel mold having been described in my above mentioned patent No. 319,515, it is unneces- 5 sary herein to do more than point out the modifications which my present invention has made in that apparatus and to state that the word annulus as used in this specification is the same as described in my said former ICO patent and is indicated upon the accompanying drawings by the letters J and K. In my patent referred to, the lower hub portion G of the mold is described as provided with a cylindriform adjustable block or plug of metal, the vertical position of which in the mold determines the length of the lower hub of the wheel casting, the said block being supported at the proper height by sand packed in between it and the fioor upon which the mold rests. In the application of my present improvements to the said mold, I wholly dispense with this block, and resort to the following substitute construction:

I is a cylindrical bed frame of any preferred construction, upon which the lower frame B of the mold proper is superimposed and to which it is connected by small flanges to give it position laterally.

P is a tubular housing concentrically disposed both with respect to the bed frame and the inner rim Hofthe mold, and conveniently supported by a series of radial webs t sprung from the inner walls of the cylindrical bed frame. The upper edges both of the tubular housing and the radial webs are fiush with the upper edges of the bed frame, but the depth both of the housing and the webs is preferably less than the total height of the bed frame, as will be apparent by a reference to the drawings. The tubular housing contains a hollow cylindrical or tubular sleeve or guide Q, which I, for convenience, term the core guide, which is conveniently supported on the tubular housing P by a circumferential external shoulder g, which is free to move and center itself with the lower hub portion G within said housing, and which is preferably,although not necessarily, capped by a ring q of baked mold material the bore of which is continuous with the bore of the core bearing,the composite bore being cylindrical. The said ring q, when the core is in the position represented in Fig. 1, forms in connection with the top of the core a chamber or basin so to speak.

The operation of pouring molten metal into the mold is so conducted that the stream of molten metal falls within this chamber, with the result that when the same becomes filled to overflowing a bath is provided which in the further operation of pouring receives the stream of molten metal and prevents the spattering of the same against the walls of the hub G.

R is what I term the core carrier, the same being a plunger, follower, or kindred contrivance of any preferred construction, adapted to support, and, under the actuation-of a lever or similar operating eontrivance, have a movement longitudinally in either direction within the core guide, so as to advance the core and subsequently recede from it.

A good construction of the core carrier is that represented in the drawings,in which the letter R is applied to a disk-like head mounted upon two parallel side bars 1', which spring from a tubular plunger 1 conveniently provided with projections 1' for the attachment of a link 8 connected with a lever S pivoted in the webs i at 8X. The carrier is also provided with a circumferentially extending basal flange r serving as a stop which, by encounter with the bottom of the core bearing, makes a fixed limit to the upward thrust of the core carrier and core.

The cylindrical bed frame I is vertically slotted at 73* to permit of the play of thelever, and the said slot is bridged by stop plus 11 to provide an adjustable limit to the throw of the lever handle, and thereby also to limit the thrust of the core carrier and core. The tubular housing P is likewise vertically slotted at 19* and the core guide Q at q", in order to permit the throw of the inner extremity of said lever.

The core W, which is mounted upon and actuated by the core carrier, is made of suitable material, molded and baked or dried about a perforated eylindriform shell w. The upper extremity of this shell is capped or covered over by the substance of the core, while the lower extremity presents an opcningflush with the end face of the lower extremity of said core which opening fits upon a teat or nipplet on the core carrier, which is hollow and preferably perforated, and which serves as a device not only to receive and center the core by having a perforated shell of the latter slipped upon it, as clearly shown in the drawings, but also as a vent for the escaping gases when and after the metal is poured.

Vith a core guide and carrier arranged as above described, the pouring of the metal in the top of the mold, at the hub, may be conducted as contemplated in my above mentioned patent, and if desired, the height of the sinking head may be increased to any extent,while the hub of the wheel may be cored up to the sinking head with security from accident, so that when this sinking head is cut off from the casting and the core is removed, a clear hole will be made entirely through the hub; moreover the mass of metal in the sinking head is not reduced nor is its efficiency as a sinking head impaired.

The foregoing are simply preferred constructions of both the core carrier and the core, but, as is manifest, other constructions of both, and other modes of application of the core to the carrier may, if desired, be resorted to; while the core may, of course, be made of any desired material.

The process of casting a wheel with the above-described mold is as f01lows:-The mold frame and mold being closed and clamped together with the core and core carrier in the position represented in Fig. 1, the annular portions of the mold are closed against the rim and hub portions by rotating the cam shafts in the upper frame. The mold and frame thus closed and clamped are, in cases where it is found necessary, moderately heated before the cast is made, with a View to avoid a too sudden heating from the molten metal, and the metal then poured rapidly at the hub until the sinking head is full. The core carrier is then, through the depression of the lever S from the position which it is repre- ICC sented as occupying in Fig. 1 to that shown in Fig.2 forced upward so as to introduce the core into the heart of the molten metal contained in the hub portion of the mold. After all this has been done, the mold is allowed to stand until a skin of the casting is set, after which the lever handle f 2 is moved so as to release the annular portions J and K, the metal in the'casting being still so supported by the lower hub and by the bottom flange on the rim that its weight cannot distort the casting. As fully stated in my former patent, the length of time during which the annular portions of the mold must remain closed after the cast has been made will vary somewhat with the proportions of the wheel. It is only requisite to keep these portions of the mold closed until a skin is formedstrong enough to prevent the fluid metal in the interior of the casting from bursting it when they are opened, and it is requisite that they should be opened before they can present any appreciable resistance to the shrinkage of the metal. As soon as the metal has solidified sufficiently to permit of the removal of the casting without distorting it, the swinging clamps and struts are thrown off, the upper rim, with the portions of the mold attached to it, arelifted off, and the casting with its contained core lifted out of its place. The mold may then be reclosed as before, and the operation be repeated as often as required.

I am aware that ingot molds have been provided with metal cores which have been forced 1. In combination, a metal mold provided I with a movable annulus, and adapted to the casting of steel wheels, a baked sand core and devices for guiding and thrusting said core into the mold from its under side,substantially as described.

2. In combination, a metal mold provided with a movable annulus and with a sinking head space and adapted to the casting of steel wheels, a baked sand core, and devices for guiding and thrusting said core into the mold from its under side and up to the sinking head space after said mold and its sinking head space have been filled with molten metal, substantially as and for the purposes described.

In testimony whereof I have hereunto signed my name this 7th day of June, A. D. 1886.

. WM. SELLERS.

In presence -of- J. BONSALL TAYLOR, WM. 0. STRAWBRIDGE.