US1273248A - Milling-cutter. - Google Patents

Description

1E LURKEH.

MILLING CUTTER.

APPLICATION FILED NM. 1M. 1911.

mmnm July 23, 19M

2 SHEETS-SHEET 1..

n W U E. LURKER. MILLING cums.

APPIEICATION FILED NOLZ M 191T.

ilmtemedi M11 13! 2 SHEETSSHEET 2.

ammo 0' [a vmw L UMWEH Wikmaw rru KOKOMO, INDIANA...

MILLING-CUTTER;

Specification of Letter s Patent.

Patented July 23, 1am.

Application filed November 2 1, 1917. Serial 1101203361. 1

To all whom it may concern;

Be itknown that l[, Enwnizn ci-tizen'of the United States, residing at LURKER, a

- Kokomo, county of Howard, State of ln-f diana, have invented certain new and useful I l t I Improvementsin M1ll1ng-Lutters,ort .wluch the fol'lowin'g 1$'21 specification.

Thisinventionflrelates to 'nnprovements in milling cutters. v The main obyects ofthls invention are:

IlFirst, to provide an improved cutter ofsuperior strength and durability and of large'capacity.

Second, to provide a nickel steel, and cutting blades held in place by casting the body, thereon, the cutting bladesnot'bei'ng of such a character as to be .adected by the casting operation and not requiring retempering or hardening.

1* urther objects, and objects relating to. structural details, will definitely appear 111g heat, that 1s, their-temper is not drawn from the detailed descriptionto follow.

Taccomplish the objects of my invention by'the devices and means described in the following specification. The invention is clearly defined and pointed out in the claims.

A structure which is a preferred embodiment of my invention is clearly illustrated in the accompanying drawing, forming a part of this specification, in whic 1;. l

Figure ll isa perspective view of a milling tion.

' Fig. 11 is a perspective view of the lower portion of the cope or theintermediate part of the flask or mold which ll preferably employ in the manufacture of my improved cutters. i

Fig. 111 is a perspective view of the drag of the mold.

lFign llV is an inverted perspective View of the upper or top portion of the cope of the mold which 1 preferably employ.

Fig. V is a perspective view of the drag and the lower portion of the cope or intermediate portion of the mold assembled with the cutterblades positioned therein.

, Fig. V1 is a rear perspective view of one of the blades of my improved cutter.

Fig. VllT is 'a more or less conventional side elevation of means which 1 employ for rotating themold during the casting operation.

In the drawlng s mllar reference charac the features of my inven milling cutter hav ing abody of tough .elastie'metal, such as.

- ters refer to similar parts throughout the several views;

1 la theJm'anilfacture of my improved cutter ll employ 'for the blades special alloys of cobalt and metals of chromium gi'oup,

known commercially under the trade name stellite and more particularly described in Letters Patent to Elwood Haynes, #873,715.

Dec. 17, 1907; aerospace, and enem es; dated April 1, 1913, and 1,150,113, dated August 17, 1915. r

- The body is preferably formed of nickel steel alloy, although other steels may be used with quite satisfactory results. Cute t'er blades made from stellite may be worked at considerably higher speed and have greater cutting qualities and are more durable than any high speed steel known to the applicant. Further, on account of the Very high fusing point of the stellite the body maybe cast thereon without the blades being affected in any manner by the resultor affected in any manner and, consequently, they do not require re-hcatmg. for hardening or tempering purposes. v

The body, when formed of nickel steel, is

tough and elastic, so that it is capable of withstanding very severe shocks and strains and further, in cooling, shrinks evenly upon the blades, so that they are very securely united and eflect'ively supported and retained. f V

Referring to the drawing, the cutter illus trated in Fig.1 is of the type known as. a, side milling cutter. It will be understood that my invention is adapted to other forms of milling cutters and cutting tools. The body 1 is, as stated, preferably formed of nickel steel alloy although other metals may be employed with quite satisfactory results. The body has a bore 2 for the shaft or ar-x her. The blades dare, as stated, formed of stcllite. "These blades are preferably outwardly tapered, as shown in Figs. 1 and V, and their rear faces are preferably provided with diagonally disposed crossed ribs 1.

When the body .is cast upon the blades the from the rearside 7 of the one blade to the front side 8 of the succeeding blade. This provides proper clearance for the blades and also permits. easy sharpening or grinding of the blades.

In the'manufacture. of my improved cuttersI preferably provide a three part flask to receive the blades 3.

grooves are or mold comprising a drag member 9, an annular intermediateor lower cope member 10 and a cope member 10. The drag member is provided with shallow grooves 11 adapted Between these wedge-shaped projections 12 which form the beveled sides ofthe blade support or abutment parts 5 of the body.

The intermediate. or lower part 10 of the cope is provided with groove-like recesses 13 adapted to receive the ends'of the blades alined with the grooves 11 of thebase. The projections 13 form the beveled top or peripheral portions of the blade supports 5. The upper part 10 of the cope is similar to the drag, being provided with grooves and projections opposed to those of the drag. The top part of the cope is providedwith a central sprue 14.

shaft 18, which is connected to the driving shaft 19- by the gears 20. A motor 21 is shown as furnishing power for the driving shaft.

The molten metal is, by the centrifugal action, driven outwardly so thatthe blades are all completely e cooling, shrinks upon the blades and, owing bedded. The metal, in

to this shrinking action and to their tapered form and the ribs thereon, the blades are very firmly and strongly retained and sup ported. In fact, it is necessary to practically destroy the cutter to loosen a blade. The blades formed fof stellite are not in any wise affected by the heat resulting from the casting of the steel body thereon, sothat it not necessary to temper or re-tempcr the same or to subject the body to any tern-- pering heat which might affect its strength and elasticity.

My improved cutters are very strong and durable and well adapted for high speed and heavy work.

I have illustrated my improvements as particularly adapted to side milling cutters, though they may be adapted to other forms of cutters and other tools, as will be readily'understood by those skilled in the art to which my invention relates.

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

1. A cutter comprising a cast metal body of nickel steel alloy, and a cutter blade of: stellite embedded in said cast metal body.

2. A cutter comprising a cast metal body and a cutter blade of stellite embedded in said cast metal body.

' 3. A cutter comprising a cast metal body,

and a' blade of stellite having transversely effectively disposed ribs thereon of substantial cross section embedded in said cast metal body, the fusing point of the blades being above the pouring point of the body, so that the ribs are not fused with the body, but constitute retaining members.

In witness whereof I have hereunto set my hand and seal in the presence of two witnesses.

EDWARD LUR'KER. [1,. s.]

Witnesses:

F. C. Jaoons, AL EN SHELDON.

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