US1213165A - Method of taper-finishing metallic bodies. - Google Patents

Description

W. W. DOOLITTLE.

METHOD OF TAPER FINISHING METALLIC BODIES.

APPLICATION FILED APR. 24. 19!

Patented Jan. 23,1917.

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WILLIAM W. DOOLITTLE, OF CHICAGO, ILLINOIS, ASSIGNOR TO CRANE COMPANY, OF

CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

METHOD OF PAPER-FINISHING METALLIC BODIES.

Specification of Letters Patent.

Patented J an. 23, 1917.

Application filed April 24, 1916. Serial No. 93,132.

' Taper-Finishing Metallic Bodies, of which the following is a full description, such as,

will enable others skilled in the art to practise and use the same.

My invention relates generally to the art of manufacturing metallic cast bodies, and has reference more particularly to an improved method of taper finishing the initial diametered cylindrical portions of such bodies to the required finish diameter.

In practice I have employed my method with great advantage in taper finishing the taper hole portion of a cock body and the tapered cylindrical external portion of its corresponding cock. Heretofore it has been customary to taper finish such portions by the employment solely of one or more taper reamers, and in cutting through the hard scale of the casting to the desired finish diameter considerable expenditure of power 7 was required to operate the reamers, during which operation this expensive class of tool was subjected to an excessive degree of wear and tear, as is well known.

My invention has for its objects to effect a material reduction in this expenditure of power and in this excessive wear and tear upon tools and their operating parts, and in this connection contemplates the employment of a cheaper class of tool and in a novel manner designed to facilitate the cutting through of the scale of the casting.

- The method in which my invention resides consists in subjecting the tapered cylindrical portion of the casting to the progressive cutting action of a series of relatively cheaper drills of gradually diminishing or increasing diameters as the case may be, the drills presenting straight cutting faces in eschelon to the work so as to permit vertical and independent cuts to be taken therein along different horizontal planes, and then grinding down to the required finish diameter the projecting steps of uncut stock or burs left in the cuts, by the introduction of a suitable tool, as a taper reamer.

The accompanying drawings forming a part of this specification illustrate in a conventional manner the tools and work support desirably used in the carrying out of my novel method, and in my co-pending application of even date herewith, Serial Number 93,133, I have disclosed and illustrated a preferred form of machine embodying said tools and work support and their operating mechanism.

In these drawings, Figure 1 represents the tools and work support involved in carrying out my novel method; Figure 2 is a perspective view of a cock body and its cock; and Figures 3 and a: represent views in section of the cock body and cock, respectively, illustrating the progressive cuts taken by the straight drills.

Referring to the drawings, it will be seen that I provide a series of straight drills A to A inclusive, carried in any suitable manner, as in a drill frame, (not shown), having their cutting faces projecting toward the work support B in gradually lowering and diii'ering terminal. planes. The drills are of gradually diminishing diameters, and in the present instance the first drill A has the greatest diameter and the last drill A the least, the drills reducing in diametrical proportion as they more nearly approach the plane of work support. The drills and the table are relatively movable in a vertical plane, but preferably the table has this movement in order to bring the work in operative relation with the drills. C indicates a taper reamer to which reference will be be made hereinafter; and D the cock body and E the cock, whose inner and outer tapered cylindrical portions, respectively, are subjected to the cutting action of the drills and reamer.

The work, in this instance the cock body I), is fixed in position on the table B immediately under the first drill A and being raised by the table theretoward, the first cut a (Figure 3) through the scale is made along a vertical line 79 that extends diagonally of the dotted line m and the full line 91,, the former representing the initial or cast diameter and the latter the desired finish diameter of the cock body. This cut leaves a projecting step g of uncut stock. The

drill A the table thereupon being again raised and a second out a in a difierent and lower plane is taken by drill A at the same time the first cut is made in the body under the drill A Progressive cuts are thus successively taken in difiering horizontal planes until the last cut a has been made, leaving a series of superposed steps Q whose projecting faces are in diii'ering vertical planes which are readily ground oil by the reamer C to the finish diameter since the hard scale has at ready been cut through by the drills. In carrying out this method in connection with an external taper face such as that presented by the cock E, hollow or shell drills and reamers need only be substituted, the first drill then in this instance having the least diameter and the last drill the greatest, the cuts a to a being taken, and the finish reaming of the steps 9 completed, exactly as has already been described in the case of the cocl: body D.

It will thus be seen that progressive cuts are taken in successive surface portions of the taper face of the casting along lines independent of each other and diagonal to'the :5 planes of the initial and finish diameters m and n, thus facilitating the sectional cutting through of the scale and the subsequent readv reaming of the steps down to the desired finish diameter.

Having thus described my invention and illustrated its use, what I claim as new and desire to secure by Letters Patent, is the following The herein described method of working the initial diametered taper cylindrical face of a cast body or the like to its finish taper diameter, which consists in subjecting the face to the progressive cutting action of a series of tools successively cutting into the stock at different depths in said face along lines diagonal to the planes of the initial and finish diameters, thereby leaving steps of uncut stock on said face, removing the body from one tool to another as a cut is taken, and dressing down the uncut stock on said face to the desired finish taper diameter.

In testimony whereof I have hereunto signed my name.

lVILLIAM XV. DOOLITTLE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C.

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