US1428993A - Art of core making - Google Patents

Description

W. A. SMITH.

ART OF CORE MAKING.

APPLICATION FILED SEPT. 2| 1921.

1,428,993. Patented-Septv 1922 A trorng Patented Sept. 12, 1922.

UNITED STATES WILLIAM A. SMITH, OF LYNN, MASSACHUSETTS.

ART OF CORE MAKING.

Application filed September 2, 1921. Serial No. 498,108.

To all whom it may concern Be it known that IVILLIAM A. SMITH, a citizen of the Jnited States, residing at Lynn, in the county of Essex and Commonwealth of Massachusetts, has invented certain new and useful Improvements in the Art of Core Making, of which the following is such a full, clear, and exact description as will enable others versed in the art to which it appertains to make and use the same.

My invention relates to improvements in the art of core making and more particularly to a method for use in the manufacture of cores.

The objects of my invention are:

To provide an improved means and multiple method of making cores in gang boxes, by means of and in which are simultaneously molded series of coresof the varying types commonly used in foundries, for the making of hollow castings.

To materially increase the production on the part of coremakers through the employment of the multiple process.

To resultingly reduce the cost of manufacture.

To provide an improved method of interlocking the base and cover portions of core boxes, eliminating the pin and socket construction heretofore used. 3

To provide an improved method of venting cores in the process of their manufacture.

To eliminate the use of wheat or other cereal flours heretofore utilized in the manufacture of cores.

To provide an improved means of amalgamating during the process of manufacture the component parts of cores.

To eliminate the use of bedding sand in the turning out process of core making.

To provide an improved dryer for use in the turning out and baking of cores.

And to provide other advantages and results some of which will be hereinafter referred to.

My invention embraces the method herein described, the steps of which are included in the appended claims.

I accomplish the purposes of my invention as illustrated in the accompanying drawing, in which Figure 1, shows the base portion of my improved gang core box. Figure 2, shows my improved vent plate for use in connection with my improved gang core box. Figure 3, shows the cover portion of my improved core box. Figure 4: shows a cross section of my improved base portion with the vent plate positioned thereon. Figure 5 shows an end view of said base with the box cover positioned thereon. Figure 6 shows a cross section of the base with said box cover positioned thereon.

Similar letters refer to similar parts throughout the various views.

Referring again to Figure 1, A shows the frame of the base portion. l3 shows the series of cross-sectionally hemispherical channels in which the cores are formed. C and C are tenons formed on the ends of the base portion which interlock in the mortises D and D of the vent plate and E and E of the cover portion, Figures 2 and 3. In Figure 2. F shows the frame of the vent plate. G shows the ridges on the face of the plate which produce in the core sand parallel indentations .known as the vents of the cores. In Figure 3, H shows the frame of the cover portion of my improved gang core box. I, shows the cross-sectionally hemispherical channels which con form in position, number and shape to those designated as B in Figure 1, against which they fit so as to form completed core moulds. My improved moulds are made in various sizes and shapes so as to produce cores for any-and all requirements. For convenience merely the drawings represent the cylindrical type.

It will be understood that heretofore core making has been carried on in foundries by single unit making methods. By the use of improved means and method I multiply production eifort and procure a correspondingly greater result.

In the process of manufacture by my improved method the base portion of my core box, Figure 1, is filled with a mixture of oil and sand such as is ordinarily used for core making and known to the trade as core sand.

The sand is struck off smooth to the top of the base portion, Figure 1, after which the vent plate mold, Figure 2, is placed over,

and pressed down onto the core sand with which the base, Figure 1, has been filled. The vent plate mold produces in the core sand parallel indentations which form the vent spaces known to be so essential in the manufacture of perfect cores. (It will be understood by those familiar to the art that these vents allow the escape of gases which generate when the cores are subjected to the heat of the molten metal used in casting.)

I The vent plate is then removed, and the top surface of the sand is dusted with a talc substance of magnesium and silica such as ordinary powdered tale. The cover portion of the core mold, Figure 3, which has been likewise filled with core sand is then placed face down on top of the base portion. The cover portion is next removed leaving a series of perfectly molded oil sand cores. A

" dryer unit, preferably made from core sand hardened bybaking in the form of the cover portion, Figure 3, is then placed over the base portion of the core box (containing the series of molded core sand cores). The base, contents, and core sand dryer .unit are then turned upside down, this operation allowing the cores to rest upon the dryer unit. The

- base of the mold is then removed, and the dryer unit with the cores thereon is placed in the ovens that the cores may be properly hardened by baking.

To those skilled in the art it is obvious that the method described is a radical change and improvement over and above the methods heretofore known and used. The old,

long tolerated, and troublesomeuse of wires in the formation of core vents is eliminated. The treatment of core sections, before joining, with the t'alc substance of magnesium and silica welds the sections into one during the process of baking. The said method need not be followed except as specified in the claims, nor necessarily in the order named and the method is therefore susceptible of modification.

Having thus described my invention I claim as new and desire to secure by Letters Patent of the United States of America.

1. In the art of core making the .method herein described comprising the moulding of core sections from a prepared core sand, treatment of that portion of their exteriors which contact in assembling with an ordinary powdered talc, and the subsequent baking of the assembled product, all substantially as described and for the reasons specified. 2. In the art of core making the method herein described comprising the molding of core sections with vents therein from aprepared core sand, treatment of that portion of their exteriors which contact in assembling with an ordinary powdered talc, nd the subsequent baking of the assembled product, all substantially as described and for the reasons specified,

3. Ina device of the kind described a gang core base, a ridged face vent plate and a gang core cover, said base and plate and said base and cover having interlocking means to insure their fixed position with relation to eachother, all substantially as described and for the reasons specified.

4. In core-making apparatus, a gang-core base and a ridged vent-plate adapted to co- In testimony whereof I aflix my signature in. the presence of two witnesses.

.WILLIAM A. SMITH.

Witnesses: I

DOROTHY F. BISHOP,

CHARLES WV. Lovnrir'r.

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