US1262719A - Method for making ingot-molds and like tubular castings. - Google Patents

Description

J. .B. WALKER.

METHOD FOR MAKING INGOT MOLDS AND LIKE TUBULAR CASTINGS.

APPLICATION FILED AUG-25. 1917- V Patented Apr. 16, 1918.

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METHOD FOR MAKING INGOT MGLDS AND LIKE TUBULAR CASTINGS.

APPUCATION FlLED AUG.25.1917.

Patented Apr. 16, 1918.

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. .W WNW? ggigwx AN JOHN B. WALKER, 0F BIRMINGHAM, ALABAMA.

METHOD FOR MAKING INGOT-MOLDS AND LIKE TUBULAR CASTINGS.

Specification of Letters Patent.

Patented Apr. 16, 1918.

Application filed August 25, 1917. Serial No. 188,167.

To all whom it may concern:

Be it known that I, JOHN B. WALKER, a citizen of the United States of America, residing at Birmingham, in the county of Jefferson and State of Alabama, have invented certain new and useful Improvements in Methods for Making Ingot-Molds and like Tubular Castings, of which the following is a specification.

My invention relates to the art of making sand molds and cores for use in casting ingot molds, pipe and like tubular castings, and this application forms a continuation in part of the application filed by me on the 12th day of March, 1917, Serial No. 154,402.

On object of my present invention is to devise a simple process for forming in one operation, preferably by the use of a jarring table or jolt machine, both the green sand core and cheek of the mold, thus simultaneously producing the whole mold and greatly simplifying and cheapening the cost of mold production and at the same time obtaining a standard of uniformity in the packing of both cheek and core sand not otherwise obtainable.

A further feature of my invention is the novel process for drawing the pattern so as to avoid all delicate operations, use being made of a crane or hoist means to suecessively and freely strip the check from the pattern and the pattern from the core. It is essential to this feature of my invention that the pattern become expansible, as soon as the cheek is stripped therefrom, to avoid injury to the core as it is drawn therefrom.

Where the cheek and core are simultaneously formed on a sectional tubular pattern, it is essential to devise some simple and effective method of holding the pattern sections closed and I have conceived the idea of accomplishing this by means forming a part of, or at least adapted to be stripped with, the cheek, my preferred method being to provide an encircling band of sand which surrounds and, as it is rammed, compresses the pattern sections so as to hold them in closed position, after which the ramming of both core and cheek can proceed in due course. The advantage of such a method hardly needs comment for the stripping of the check will obviously free the pattern to expand when it is stripped from. the core.

Vhen a jarring process is used to ram the sand core and cheek about an ingot mold pattern, I have heretofore found it necessary to ram by hand the sand under the outstanding lug patterns. According to my present invention I avoid this objectionable operation by leaving the pattern free of any outstanding projection which will interfere not only with the vertical stripping of the cheek but also with the jolt ramming of sand thereunder and I provide detachable lug patterns which are free to slide vertically in guides on the main pattern, the molds for the lugs being formed by the use of these detachable patterns by either of the two following methods, to-wit: Ramming the cheek and then removing suflicient of the rammed sand to form a seat into which the lug pattern can be dropped in its guides and afterward packing sand by hand around the pattern; or, mounting the lug patterns on the main pattern before the ramming of the cheek is completed so that the lug patterns will be jolted down during the last stage of the ramming operation and will thus settle with the sand which will be found to be rammed hard and firm under the lug pattern.

As illustrative of an apparatus for carrying the methods forming the subject matter of my present invention into effect, reference is made to the accompanying drawings, in which Figure 1 is a vertical sectional view taken on the line 11 of Fig. 5, showing the core and cheek both rammed. and illustrating the two methods of forming the lug mold with detachable patterns.

Fig. 2 is a side elevation of Fig. 1 with the flask and pattern broken'away to illustrate the sand band formed for holding the pattern contracted during the ramming operafer to use a jarring table or jolt machine 1 on engaged and forced outwardly to expand the core arbor by means 01 a wedge plate 7 bearing on the pawls and a wedge key 8 driven through the top of the column and bearing on the plate. (lo-acting lugs 9 and 10 on the column and staves limit the outward movement oi? the latter, all as is more fully described in my Letters Patent No. 1,221,116. The stool is recessed in its upper face at 11 to form the drag portion of the mold. I first mount a stripping plate 12 on the drag and detachably connect it to the flask, when the latter is lowered onto it, by clamps 13 adapted at their lower ends to be received in notches l l in the 1 next lower the tubular pattern 15 over the arbor, 'ts lower end being seated on the drag sand and loosely centered by the stripping plate. The pattern, which forms the subject matter of -myapplication above referred to,'is split across corners into vertical half sections pivotally connected at their upper ends by the lugs 16 and pivot pins 17. In the abutting faces of the joints between the pattern sec tions 1 provide suitable means on each side to guide them together and hold them against relative movement when collapsed, such means comprising upper dowel pins 18 with suitable sockets therefor and lower hook lugs 19 adapted to work in recesses 20 and by engagement with stop plates 21 to limit the expansion of the pattern. The pattern is lowered into place by a tackle connected to hanger plates 22 connected to the pivot J 17, thus leaving the pattern sections free to swing to closed position. 1: next lower the flask 23 over the pattern onto the stripp ng plate and connect it by clamps 13 to the stripping plate and by clamps 24C to the stool drag. The flask also is formed in vertical sections as described in my Lette's latent No. 1,221,117, the sections of 1.1 are normally held closed by clamps engaging flanges 26 along the meeting edges oi the flask sections. When the apparatus is thus assembled sand is first introduced between the pattern and the flask to a height of about a foot, the jarring table is then operated to give the apparatus three or four jolts. As this sand which forms an encircling sand band about the pattern is packed it acts to force together the lower or free ends of the sectional pattern and prevent them from spreading. Having thus preliminarily secured the pattern in position, sand is filled in on both the inside and outside of the pattern to build up the cheek and core simultaneously and substantially ly, the j olting operation proceeding untilthe sand is packed practically to the top level of the pattern.

It will be observed that the pattern does not carry lugs for torming the ears or lugs on the ingot mold and my reason for leaving the exterior of the pattern free of projections will be apparent when it is considered that my purpose is to pack the sand by the jolting Or jarring process. It the lugs were formed on the pattern it would be practically impossible to mechanically accomplish the proper packing of the sand under the lugs. According to my present process, the operatorouses a shovehthe blade oi which -is shaped so that, when thrustdownwardly into the packed sand around the top of the pattern, it will remove sufiicient of the sand to form a seat which will receive a detached lug pattern 27'. To insure the lug patterns being set in the right position, they are provided with-tongues 28 that fit into vertical guide slots29 in the pattern. After seating the lug patterns, additional sand is thrown over them and rammed. If desired, after sand has been rammed slightly above the bottom of the slots 29, the lug patterns may be set in their vertical guide slots 29 and enough sand thrown in tohold them in position while the ramming proceeds, the patterns being preferably disposed so that they will settle slightly during this rammingoperation to make sure that the sand under them is rammed tightly.

W hen the ramming operation has bee completed, the clamps 2 1 are knocked loose and the crane is first applied, in the manner described in my Letters Patent No.1,221,117, to lift the flask and strip the cheek from the pattern and stool drag and deliver it to foundry pits for finishing. The lug patterns will strip off with the cheek and can readily be drawn as part of the finishing oporation. The crane hooks are then applied to the hanger plates of the pattern and, the encircling sand band which forms part of the cheek having been removed, the bottom end of the pattern is released to expand to the full extend permitted by the stop lugs 19. As the pattern is lifted to strip it from the core, it will ride freely up the core and the latter will be thus protected from collapse or injury. As soon as the pattern clears the core it can be set over another core arbor and the operation repeated, it being noted that the pattern sections will swing together into closed position by gravity as soon as they are free of the core.

By the method suggested of forming the sand band for contracting the pattern I save one operation required to contract and secure the pattern sections together and an other operation to release them so that the pattern can expand; It will be understood however that the sand band is only the preferred means, as my invention contemplates the use of any device or means which will hold the pattern contracted during the ramming operation and which will strip with the cheek. In order to facilitate the stripping of the cheek, the pattern is preferably formed with a slight taper upwardly and this taper is effective within the pattern also to facilitate its stripping from the core.

After the cheek and core have been dried and packed the flask is lifted and set back over the core, the stripping plate having been removed and the mold is then closed, as shown in Fig. 4;, ready for pouring operation.

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

1. The hereindescribed process for simultaneously ramming a sand mold and core for hollow articles by the use of a tubular sectional pattern which is expansible, which consists in first ramming an encircling sand band about the lower end of the sectional pattern to hold it contracted before ramming sand within the pattern, as and for the purposes described.

2. A process for making cheeks and cores simultaneously with a common sectional expansible pattern, which consists in ramming a sand band forming part of the cheek to hold the pattern sections in contracted relationship before starting the ramming of the core.

3. A process for malfl'ng mold cheeks and cores simultaneously with a sectional expansible pattern, which consists in first ramming a sand band about the bottom end of the pattern to contract it and hold it contracted and then proceeding substantially evenly with the jolt ramming of the sand both within and without the pattern to cotemporaneously produce a cheek and core of substantially equal density, substantially as described.

at. A method of making molds and core simultaneously with a sectional expansible pattern, which consists in first packing a sand band about the bottom end of the pattern to contract it and hold it contracted and then proceeding with the packing of the sand both within and without the pattern, and stripping the mold with said sand band as a part thereof from about the pattern before stripping the pattern from the core.

5. The hereindescribed method of making sand molds for ingot molds on a jarring table, which consists in first packing the sand about the pattern by jolting to form the mold, removing suificient of the packed sand at the top of the mold to form seats to snugly receive lug patterns, inserting the lug patterns in the seats thus formed, and ramming sand about the lug patterns to complete the operation, substantially as described.

6. The hereindescribed method of making.

sand molds for ingot molds on a jarring table, whichconsists in first jolt ramming the cheek about an ingot mold pattern with the mold lug patterns removed, removing sufficient of the packed sand at the top of the cheek to form seats to snugly receive the lug patterns, inserting the lug patterns in the seats thus formed, ramming sand about the lug patterns to complete the operation, stripping the cheek with the lug patterns therein upwardly from the pattern, and drawing the lug patterns from the cheek before finishing it, substantially as described.

7. A process for the production of sand molds for casting ingot molds and the like, which consists in assembling the flask pat tern and core arbor on the drag, simultaneously ramming the cheek, core and drag about the same pattern, stripping first the cheek from the pattern and then the pattern from the core and drag without removing the core from the drag, and remounting the check on the drag surrounding the core preparatory to casting.

8. A process for theproduction of sand molds for casting ingot molds and the like, which consists in jolt ramming both cheek and core simultaneously on the drag using the same pattern, first stripping the cheek from the pattern, then stripping the pattern from the core, and finally reassembling the cheek on the drag about the core for the casting operation.

9. A process for the production of sand molds for casting ingot molds and the like, which consists in jolt ramming the cheek, core and drag simultaneously on the same pattern, leaving the core mounted on the drag, stripping the cheek vertically from the pattern, stripping the pattern vertically from the core, and replacing the cheek on the drag about the core to close the mold ready for pouring.

10. A process for the production of sand molds for casting ingot molds and the like, which consists in simultaneously jolt ramming both cheek and core on a common expansible tubular pattern and introducing the sand so as to start the cheek first and afterward to build up the core and cheek substantially evenly during the jolt ramming operation.

In testimony whereof I afiix my signature.

JOHN B. WALKER.

Witness:

NoMm WELSH.

Copies or this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

7 Washington, D. G.

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