US1127740A - Method of making buckets for turbines. - Google Patents

Description

C. W. DAKE.

METHOD OF MAKING BUGKETS FOR TURBINES.

APPLIUATION FILED D5010, 1913.

1, 12%?49. Patented Feb. 9, 1915.

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UNITED STATES PATENT OFFICE.

CHARLES W. DAKE, OF CHICAGO, ILLINOIS, ASSIGNOR T0 PYLE-NATIONAL ELECTRIC HEADLIGHT COMPANY, OF CHICAGO, ILLINOIS. A CORPORATION NEW JERSEY.

METHOD OF MAKING BUCKETS FOR TURBINES.

Application filed December 10, 1913.

To all whom it may concern Be it known that I, CHARLES W. DAKE, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinols, have invented a certain new and useful Improvement in Methods of Making Buckets for Turbines, of which the following is a specification.

My invention relates to a method or process of maufacturing buckets of a peculiar shape and type for application to the rotor ring or wheel for the purpose of making the rotor of a turbine.

The description of my invention is aided by the drawings forming part of the specification, Wherein- Fi ure 1 is a plan view of a piece of sheet meta Fig. 2 is a plan view showing the first step in two alternative forms; Fig. 3 in like manner showing the first two steps; Fig. 4, the first three steps; Fig. 5 is a cross section on the line 55 of Fig. A; and Fig. 6 a cross-section on the line 66 of Fig. 4. Fig. 7 is a side elevation of the bucket comlete. P Like parts are indicated by the same letters in all the figures.

In describing the method and process I shall refer to these drawings as means of explaining the successive steps.

I first take a sheet of metal usually in the form of a long ribbon preferably wound or rolled. This is straightened out as it is paid ofl preparatory to carrying on the various steps of the process. The first step of the process consists in stamping out the blank A in substantially the form indicated in Fig. 2. In my preferred method of working my process, I do not cut the blank A from the sheet metal at the dotted line A but this may be done. The blank A has the outline necessary to form the bucket and if entirely severed from the sheet of metal is then fed in any desired manner forward to the cutting machine or table or operator. The second step consists in forming the blank into the shape B as shown in Fig. 3 so that it has the inwardly turned bucket securing lugs 13, B The third step consists in forming the bucket as indicated at C by holding its two ends toward each other or into a vertical position and pressing and stretching the bottom of the bucket into a curved surface. The result is illustrated in Figs. 6 and 7 wherein is shown a bucket C with a curved Specification of Letters Patent.

Patented Feb. 9, 1915.

Serial'No. 805,718.

bottom, lateral projecting securing lugs and side walls.

The particular device the making of which is the object of this invention presents a good deal of difficulty and there are, of course, a great many ways of making it.

The process herein set forth-is the result of long investigation and experiment with a view to ascertaining the best method. After the blank has been formed by this first process, that is, when the shape has been substantially completed so as to furnish when properly folded and stretched and pressed the necessary material for the bucket, it is desirable that it still be carried by and therefore be attached to the sheet from which it is formed. The two securing pieces must be bent so as to lie outside of the bucket and the bottom of the bucket must be bent or pressed or stretched into a form to present a face of substantially the same curvature as the curved ends of the sides of the bucket. This involves a stretching process. Since the buckets have to be arranged in a series in close proximity to each other, it is essential that these curves be properly formed and related. By the succession of steps hereinbefore recited, I find that I am able to give to the bucket a proper and permanent form without displacement or dislocation of any of its parts, the whole being formed so that the curvatures of both sides of the bottom of the bucket formed by pressing and stretching and the curves of the two upper edges of the sides of the bucket formed by cutting are not only in proper relation in the individual bucket but in the series of assembled buckets, or in proper relation to each other.

I claim:

1. The process of forming from sheet metal a bucket for the rotor of a turbine which consists in stamping out a blank in the form indicated so as to leave the blank attached to the sheet with the metal removed so as to form the outline of the blank, then pressing to one side the securing lugs so that they lie outside of the body of the bucket when the latter iscompleted, then forcing into parallelism the two sides of the bucket and pressing and stretching the bottom thereof so that its two surfaces have substantially the same curvature as the curved edges of the sides of the bucket.

' 2. The process of forming from sheet the form. dicated so as to leave metal a bucket for the rotor of a turbinewhich eonsists in tamp ut b1mki e attached to the sheet, said blank so 'formed havin three zones of.progressively decreasing width, the widest zone being bounded on the. side, removed from. the other zone by a curved line, bendjngthe two'sides of'the widest zone up and inwardly so that the re inclined one toward theotherand g the two'end zones toward, oii'eka'iiot er I into parallelism substantially at right angles to the central zone and and stretch- 11 1 the centralzone into a euryedshape .to su stantially conform on its outsideflith 15 the curved line bounding the widest zone.

' In testimony whereof, I aflix my signature in the presence of two witnesses this 8th day of December,'1913.. CHARLES W. DAKE.

' Witnesses:

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