US730362A - Turbine-bucket-cutting tool. - Google Patents

Description

PATENTED JUNE 9, 19.03 H. GEISENHUNBR. TURBINE BUCKET (HITTING TOOL.

APPLIGATION FILED DEC 23 1901 H0 MODEL,

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- .........mui\ll" 60m 61 si m inventfor Henry GeLsenhtiner No. .362. Patented June 9,1903.

U ITED STATES PATENT OFFICE.

HENRY GEISENHONER, OF SOHENEOTADY, NEW YORK, ASSIGNOR TO GEN- ERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

TURBINE-BUCKET-CUTTING TOOL.

SPECIFICATION forming part of Letters Patent No. 730,362, dated June 9, 1903.

Application filed December 23, 1901 Serial No. 88.931. (No model) To all whom it may concern: of asteamturbine-wheel, showing the cutting- Be it known that I, HENRY GEISENHONER, tool in different positions in the channels a citizen of the United States, residing at thereof; and Fig. 5 is a side elevation of the Schenectady, county of Schenectady, State of cutting end of the tool represented as in op- 55 5 New York, have invented certain new and eration.

usefullmprovementsin Turbine-Bucket-Cut- As shown in the drawings, my invention ting Tools, of which the following is a speciconsists of a long narrow blade A, the length fication. of which will depend upon the depth of chan- My invention relates to turbine-bucketnels required to be cut, provided with a rec- 6': to cutting tools that is, to tools adapted to cut tangular nib or shank B at one end, whereby irregular or sinuous channels in a metallic the tool is adapted to be engaged and sedisk or wheel, whereby the integral segments curely held in the tool holder or spindle. The left between such channels will constitute shape of the blade A is substantially uniform properly-shaped turbine-buckets. V in size throughout its length and of a cross- 65 I 5 Heretofore it has been impracticable to section as indicated in Figs. 2, 3, and 4 of manufacture steam turbine-wheels with inthe drawings, with the outer or right-hand tegral buckets for the reason that no cuttingside 2 made cylindrical of short radius and tool known or used prior to myinvention was the inner or left-hand side 3 made nearly adapted to or capable of cutting the deep, plane or cylindrical with long radius of cur- 7 narrow, sinuous channels between thebuckvature, the curvature of the outer side 2 beets. These channels are often required to be ing regulated by the greatest curvature or six inches in depth and only a quarter or fiveconcavity in the face side 7 of the turbinesixteenths of an inch in width, and as a conbuckets D and the curvature of the inner sequence the cutting-tool must be co rrespondside 3 of the tool being regulated by the shape 7 ingly long and thin to travel in said chanof the back side 8 of said buckets. The connels and to provide for the necessary clearverity of the sides 2 and 3 of the tool is alance. Moreover, because of the sinuous form ways made somewhat greater to provide for of the channels and the necessity of keeping side clearance. The cutting edge O is located the cutting edge at right angles to its line of at right angles to the blade and at the central 8o travel the tool must be narrow and further axis thereof and is made by grinding off the reduced in thickness at its edges to permit it leading edge 4 of the tool-blade near one end to be turned upon its axis in said channels and by slightly swaging the metal of the lower as it traverses them. Furthermore, steam clearance-face 5 in the vicinity of the cutting turbine-wheels are now made of cast-steel, edge, forming the enlargements 6 6, so that 85 which, as is well known in the art, requires the cutting edge is slightly longer than the great strength in the cutting-tools. greatest thickness of the blade A. As incli- The object, therefore, of my invention is cated in 4 of the drawings, the tool at first to provide a bucket-cutting tool which shall moves in nearly a straight or slightly-concave operate effectually to cut irregular or sinuous path, the direction of which is about thirty de- 0 40 channels of relatively small width and great grees to theplane of theturbine-wheel. After depth. moving a certain distance-about one-fourth The invention will be more readily underor less part of its travel it is turned gradually stood by reference to the accompanying drawabout its axis and caused to move in a circular ings, forming a part of this specification, and path for the larger part of'its travel and then 95 in which. moves along another nearly-straight path as Figure 1 shows in side elevation a short or it emerges from the channel. It will be obcontracted bucket cutting tool embodying served that the blade of the tool does not in= my invention. Fig. 2 is an elevation of the terfere with the movement of the tool about cutting end of the same. Fig. 3 is a transits axis, as it is turned to keep the cutting [00 5o verse section of the blade of the tool. Fig. 4 edge O at right angles to its line of travel,

is a developed plan of a portion of the face and at the same time it will be noted that the effective width of the tool is nearly equal to the thickness of the turbine-wheel. On account of this large effective width of the blade of the tool I am enabled to take relatively thick chips, as indicated in Fig. 5 of the drawings, from cast-steel without causing the tool to chatter and without danger of breaking it.

Referring to Fig. 3, it is tobe noted that the body of the blade has a much greater length than width. In the present instance the length is more than twice as great as the width; This relation is made necessary by reason of the great strength required to out sinuous passages of the character described. It is also to be noted that the sides of the body of the tool taper from a middle portion toward the front and rear edges, the latter being thin, like a knife-blade, but forming no part of the cutting edge. It is important to have the side wall 2 of the body conform approximately to the curvature of the bucket-wall, because the presence of metal at this point gives strength and rigidity to the tool. Someclearance at this point is permissible, but preferably it should be as small as possible, the particular shape of the bucket and the character of the steel being out being the principal factors which determine this. The curve of the side 3 is made much flatter than that of the opposite or outer side, the object being to permit the tool to be oscillated slightly on its own center as it follows the sinuous path prescribed for it by the bucket-cutting machine. The thin front and rear edges of the body considered in cross-section are made necessary by the peculiar curvature of the buckets. If these ends were made thicker, they would prevent or largely limit the oscillating of the tool, which is essential to good work. The great -length of the body of the tool with respect to its width when viewed in cross-section prevents the chattering of the tool when in use by giving to it a rigidity sufficient to counteract the eifect of the cut. The tool is adapted to form the passages by successive cuts, and as the passage gets deeper and deeper the ne cessity of having an unyielding tool and one which will pass freely through the passage between the buckets becomes more apparent.

IVhile I have restricted the above description to the specific construction shown in the drawings it is evident that other forms may be constructed embodying the essential features of my invention, and while I have in the claims hereto annexed employed the word central as expressing the approximate location of the cutting edge of the tool I intend forming sinuous passages by successive cuts,

comprising a body portion having a curved side wall that substantially conforms to the curvature of the passage, and a second side wall that is oppositely curved, the said body portion having, in crosssection, a greater length than width, considered in the directionof the passage, and a cutting edge that extends across the tool in the direction of, its

width.

2. As an article of manufacture, a tool for forming turbine-buckets by successive cuts, comprising a body portion which, in crosssection, has double convex side walls and, when considered in the direction of the out, has greater length than width, and a cutting edge centrally located that extends across the body in the direction of its width, and is slightly wider than the body.

3. As an article of manufacture, a tool for forming sinuous passages by successive cuts, comprising a body portion having double convex sides with a greater length than width and thin front and rear edges, when considered in cross-section and in the direc tion of the cut, and a cutting edge at one end which is centrally located and extending at right angles to the body.

4. As an article of manufacture, a tool for forming sinuous passages by successive cuts, comprising a body portion which in crosssection has a greater length than width, the said body tapering from the middle toward the front and rear, and a cfitting edge located centrally with respect to said body and situated at one end.

5. As an article of manufacture, a tool for forming turbinebuckets by successive cuts, comprising a body portion having curved sides 2 and 3 which are formed on different radii, and a cutting edge 0 located at right angles to the body and at the central axis thereof, and formed by cutting away the leading edge, as at 4, and the heel, as at 5.

In witness whereof I have hereunto set my hand this 14th day of December, 1901.

HENRY GEISENIIONEB.

Vitnesses:

ALEX. F. MAoDoNALD, RoBT. O. CHAPMAN.

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