Патент USA US2406938код для вставки
2,406,938 Patented Sept. 3, 1946 _UNITED STATES GFFICE 2,406,938' ’ METHOD OF REAMING Edgar L. Zehrbach, Lima, Ollio Application October 7, 1943, Serial No. 505,284 2 Claims. (Cl'. 'f7-¿72) . . 1 _ This invention relates to reamers and particu larly to reamers used in high precision Work. An object is >to produce a new and improved method of reaming by which the position yof the tool is adjusted in a simple and convenient man ner to control the size of the hole. This is par ticularly important not only to secure accurate results but also to increase the life of the reamer, it being possible _to slightly adjustthe reamer after it has been worn to such point that it cannot ream a hole of the desired diameter, so that it will thereafter ream. to the desired accuracy in spite 2. work W is formedv with a hole H to be reax‘ned. As will be readily understood, rotary motion is imparted to the work W during the reaming op eration during which relative,> translatory move ment between' the holder B and work is im parted. r"I'he reamer has a shank portion Ill', a portion of thelforward end of which is fiuted as indicated at I I to carry away the cuttings in the usual manner. Ín advance of the fiuted portion II and in `fixed relation thereto, is a cutting head I2 formed with a suitable number of lands I3 ar ranged in annular formation. Directly in rear of the lands I3 is an inwardly tapered neck I4 merg ci wear. "This accomplishes a two-fold result. ing with the flutedportion I I. y 4 The life of the` reamer is greatly lengthened and also accurate reaming can be effected at all times. 15 An important feature of the invention is in the relatively narrow cutting head in rea-r of Another object is to produce a simple and effi which is a shank portion of substantially reduced cientv method for reaming relatively small holes The_length of the cutting head may l diameter. with greater uniform accuracy than has been pos vary in accordance with the length of the hole sible heretofore.l " A further object-is to produce a reaming method 20 toI be reame’d, the controlling factor being that the angularity or eccentricity‘ of the reamer rela which militates against the formation of the so called bell mouth at one Or opposite ends of the reamed hole. tive to the axis of the hole to be reamed must in no case be such ‘that the shank or fluted portion ‘of the reamer will engage the mouth or edge Dor A still further object is to produce a new and improved method of reaming holes of any pre 25 tion of the hole. In other words, with the parts determined size within the range of the reamer without changing in any way the form, configura tion or structure of the tool itself but by a simplev adjustment or alteration of the position of the Y reamer Vrelative to the work. ì O_ther objects and advantages `of the invention will hereinafter appear, and for purposes of illus tration but not of limitation, an embodiment of the invention is shown on the accompanying drawing in which` Figure lis a bottom plan view partly in section showing a lathe mounted reamer holder and in the position-shown in Figure 2, the reamer must be enabled to pass completely through the hole H without the ilu'ted portion II or Shank' `I Il engaging the mouth of the hole or that end ofthe hole in lwhich the reamer is inserted. The reamer shank may be cut away on one side to give a greater angular adjustment if circumstances make this necessary. In operation it‘will be manifest thatthe' reamer A can be moved in axial alignment with the hole H as indicated in Figure 1 to effect the desired reaming operation. Oftentimes it is not possible to Obtain exact axial alignment. This oftentimes reamer, with the latter axially aligned with the is due to the lathe or other machine on which hole in the work; the reameris mounted because of Wear or inac 40 Figure 2 is a top plan View of the parts shown curacies in the machine. In such cases, when the in Figure 1, but with the reamer adjusted to'a ordinary reamer is employed, bell-mouthed holes position with its axis offset from or angularly ' result and particularly in precision Work, this is disposed relative to the axis of the hole to be most objectionable, and results in the scrapping reamed; ' Figure 3 is aV view substantially on the line 45 of that part. Bell-mouthed holes can not be reamed with the above described reamer »A be 3_3 of Figure 1; cause even with the reamer A arranged out of Figure 4 is a section substantially on the line axial alignment' or eccentrically with respect to 4-4 of Figure 2; and the hole to be reamed, there is no possibility of Figure 5 is an enlarged fragmentary sectional bell-mouthing in View of the vshortness of the 50 View illustrating the operation of the reamer when lands compared with the depth of the hole and the same is disposed with the reamer axis eccen the reduced diameter of the shank. tric to the axis of the hole to be reamed. It is found empirically that such eccentricity of The illustrated embodiment of the invention the reamer with respect to the axis of the hole comprises a reamer A carried by a holder B, the latter being suitably mounted on a lathe. The 55 to be reamed can be employed to greater advan 2,406,938 4.A tage in the use of the reamer above described. 26 to receive suitable socket Wrench. On the rear With the reamer disposed in the position such as side of the plate I9 is a nut 2'I. The dial 25 is indicated on Figures 2 and 5, the cutting action is provided with suitable calibrations 28 which may conñned to the areas C and C’ or what might be be brought into registration with a suitable mark termed the toe or front upper portion of the cut formed on the plate I8 adjacent thereto. ting lands and the heel or lower rearward portion In practice a plug gauge will show the size of (Figure 5). It Will be manifest that by varying the holes being reamed. If it appears that the the eccentricity or the oifset angular relation of holes are too small, then it is necessary that ~the reamer with respect to the axis of the hole angular adjustment of the reamer A be made. 10 to be reamed, the size of the reamed hole can be This is effected by ñrst loosening the bolt 20 and be varied. The amount of adjustment or eccen then loosening the nut 21. Thereupon by the use tricity is governed by the amount of angularity of a socket wrench, the dial 25 can be adjusted which can be imposed on the reamer without its to the desired extent. For example, it may appear shank engaging the sides of the hole. that the reamed holes are one one-thousandth of In practice this reamer may first be used in 15 an inch under size. In that event, the workman axial alignment with the hole to be reamed. will know that by adjusting the dial the proper After a period of time, the reamer becomes worn amount, the holes subsequently reamed will be and the normal procedure so far as other reamers one one-thousandth of an inch larger. There are concerned, is to discard it. In this case, con upon, by tightening the nut 21 and bolt 2I, the tinued use of the reamer can be had by angularly 20 reaming operation can be continued. A pin 29 adjusting it as above mentioned so that the cut in the plate I8 secures the reamer in place. ting head does not enter the hole axially but Although I have shown and described an em eccentrically. By the usev of plug gauges, the bodiment of the invention in connection with a workmen can readily determine whether the hole lathe, it is to be understood that the invention is being reamed under size. In that event, adjust 25 can be embodied satisfactorily in a drill press ment is made of the reamer an amount suñicient where the reamer instead of the Work rotates, the to compensate for the wear. Later on when iur work remaining stationary. It is therefore to be ther wear occurs and the gauge shows that the understood that changes in details of construc hole is again under size, a further angular ad tion, arrangement and operation may be eiîected justment of the reamer is eiîected and its use 30 without departing from the spirit of the invention continued. It is found that such reamer can be especially as deñned in the appended claims. used over an extended period of time in an ex What I claim is: ceedingly satisfactory manner without sacrifice l. The method of reaming which consists in to accuracy of the reamed hole. providing a reamer with a cutting head of sub The holder B is designed to enable such angular 35 stantially less length than the depth of the hole adjustment of the reamer to be readily and con to be reamed and of less diameter than the diam veniently eiiected. As shown, the holder has an eter of such hole,r olïsetting angularly the axis of outwardly extending barrel or chuck I5 into the reamer relative to the axis of the hole an which the inner end of the shank I0 lits loosely. amount predetermined according to the desired At the rear end of the barrel is a sleeve I6 which 40 size of the reamed hole, and imparting relative receives the inner end of the shank I 0. A pair of translatory and rotary movements between the angularly disposed adjusting screws I‘I arranged reamer and the work with the cutting head in on the under side of the barrel are adapted to such offset position. engage the shank I0 which rests against them by 2. The method of reaming which consists in gravity. The inner end of the barrel I5 is ñxed providing a reamer with a cutting head of less to a plate I8 which abuts against a plate I9 suit diameter than the diameter of the hole to be ably ñxed to the lathe. The plate I8 is pivotally reamed and a reduced operating shank, angularly mounted with respect to the plate I9 by a bolt offsetting the axis of the cutting head with re 20 arranged at one side. The bolt 20 has a head spect to the axis of the hole an amount prede 2I socketed to receive a wrench so that the plates 50 termined according to the desired sizeof the can be loosened sufficiently to eiîect the desired reamed hole and without the shank engaging the adjustment.> On the other side of the barrel I5 sides of the hole during the remaining operation, the plates are connected by a bolt 22 which has and imparting relative translatory and rotary an eccentric portion 23 disposed within an elon movements between the reamer and the Work with gate slot 24 in the plate I8. Fixed to the outer the cutting head in such offset position, end of the bolt 22 is a dial 25 formed with a socket EDGAR L. ZEHRBACH.