‘Def. *1, 1946. ‘J; J. BEDNAR EI'AL 2,408,596 METHOD'OF FORMING CYLINDER ENDS Filed March 13, 1944 '2 Sheets-Sheet lv w > if '20 ' 4 Oct. 1, 1946. ' - ' ' _J. J. BEDNAR EI'AL - 2,408,596 METHOD OF FORMING CYLINDER ENDS- > Filed March 13, 1944 2 Sheets-Sheet? ' 1 721545 Mal/mi. /' ' v > _ y _ ?zveizz’arsx ‘balsa/7' J. 1950/1/46 m4 ?rm/5v PECK, Patented Oct. 1, 1946 2,408,596 UNITED STATES PATENT ornce 2,408,596 I METHOD OF FORMING CYLINDER ENDS Joseph J. Bednai- and Steven P. Peck, McKees port, 2a., assig'nors, to National Tube Company, . a corporation of. New J ersey . _ - Application March 13, 1944, Serial No. 526,253 1 2, Claims, (Cl. 29-1482) . This invention relates, to an improved method of spinning integral ends oncylindersto adapt them for high-pressure service. Heretofore the spinning of cylinder ends has 2 dition of the tube orcylinder and the di?erent stages in the operation of the method. . . Figure 7 illustrates a step in the method where in the mid-portion of the built-up metal of in been quite de?nitely restricted touse on small creasedthickness is forced inwardly into engage cylinders suited only for low-pressure work. One m ment with a die member. object of the present invention is to provide a Figure 8 illustrates the step of removing feath method for building up the thickness of an end er-like portions resulting from the operation of section of a tube or cylinder which will adapt Figure 7. it for high-pressure service. 10 Figure 9 is a detail portion of an end of a A further object isv to provide a method involv cylinder made in accordance with the’ herein ing the building up of the end thickness of a claimed method. ' cylinder by spinning and subsequently eliminat; Referring in detail to the drawings, l0 repre ing the ?ssure or feathers formed in the region‘ of the original point of juncture of the end edges. 15 sents a conventional form of chuck adapted to grip a tubular or cylindrical workpiece l2. This As will appear more fully hereinafter, our im-4 chuck is rotatably supported by a suitable spin proved method involves spinning integral closed dle M of conventional form Which is rotated by ends on tubular metal workpieces to form a clo any suitable means such as a belt l6 connected sure capable of withstanding a pressure of 2500 ' to a power drive (not shown). The chuck and pounds per square inch or greater, the method. 20' its driving means are adapted to rotate the tu being characterized by rotating the workpiece bular workpiece‘ I2 at a speed of approximately while. applying a work-engaging tool to. the end, , 1400 R. P. M. Mounted in juxtaposition with the portion thereof, moving said tool‘ through arcs chuck ‘I 0 is a tool bed [8 having slidably mounted extending from the periphery toward the l‘ongi- Y thereon a table 20 which canbe reciprocated back tudinal axis'of the workpiece, also moving the and forth by any suitable means in the direction _ tool axially of the workpiece, to bring the end‘ lengthwise of the work. ‘ edges of said workpieceforcibly into abutment. A compound tool rest. 22 is pivoted at 24 at in the region of the longitudinal'axis thereof‘,f_ 1 a, point'ecccntridto- the longitudinal axis of the and thereafter continuing the movement of said tocl in arcuate paths extending from the periph ' ' cry to a point beyond the longitudinal axis of »_ the workpiece, so as to upset said end portion_ and build up metal of increased thickness with 30 workpiece I2. The tool rest carries a slide 26 which supports‘ a tool holder 2,8 carrying a tool 30 which is preferably, although not necessarily, in the form of a roller pivotally mounted in a bearing 32, so that the tool can make a, rolling out a ?ssure outside the original point of junc- ' contact with the end portion of the tubular work ture of said edges, then stopping the rotating and 35 piece l2. Prior to the operations about to be thereafter pressing the mid-portion of the closed _ described, the end portion of the workpiece will end inwardly into engagement with a die mem- ' usually be locally heated, for example, by the her having an axial recess opposite the point of impingement of ?ames from oxyacetylene torches juncture of said edges, whereby feather-like por such as indicated at 34 and 36. The torches are tions in the axial region adjacent said point of eife‘ctive to maintain the end of the workpiece juncture are pressed into said recess, and there at the optimum spinning temperature of approx after removing said feather-like portions. imately 2000° to 2200° F. The torch 36 is mount For a full understanding of the invention, ref ed adjacent the compound rest 22, and the torch 34 is mounted on any stationary portion of the erence should be made to the following detailed apparatus. disclosure, the accompanying drawings, and the appended claims. ' In starting the improved method, after the ' In the drawings: work is properly heated, the tool 30 is moved > to the position of Figure 2, where the leading ‘edge of the periphery of the tubular workpiece 50 is engaged. After such engagement the tool rest 22 is swung about its pivot 24; for example, from the position of Figure 2 to the position of Figure i3, through the arcuate path indicated by the dotted arc a:.—y, the tool'at this time swinging Figure 1 is a plan view of conventional appa- - ratus suitable for carrying out the present inven tion. Figure 2 illustrates an initial step of the im proved method. Figures 3, 4, 5 and 6 are views partly in ele vation and partly in section, illustrating the con 55 about a radius r struck from the center 24 which, 2,408,596 3 4 off the projecting feather-like portions which as shown, is in plan and is offset from the longi tudinal central axis of the workpiece [2. The tool 30 is moved back and forth along its arcuate path several times, with the result ?ank the ?ssure. At the conclusion of this oper ation the interior of the cylinder will have the ?nished face 54 and the exterior will have a dished cavity 56, as shown in Figure 9. that metal from the outer normally cylindrical portion is ?owed inwardly, thus thickening the It will be understood that in the machine op eration of Figure 8, the feathers 46 ?anking the ?ssure .willbe eliminated. .Thus the end closure end region?of the tubefromythe normal gauge of the workpieceto‘the thickened condition sug or bottom of the cylinder is a dense homogeneous gested in Figure 3. Subsequent arcuate sweeps ._ solid section free from physical defects and sum or the tool 3!] with an accompanying endwise .10 cient to withstand high commercial test pres movement of the tool toward the work gradually sures of the order of 2500 to 3500 pounds per spins in the end of the tube'until it is substan square inch. _ ‘ tially closed, as shown in Figure r _ 4. rI‘he arcuate _ _} stroke of the tool 38 is then increased to the position such as suggested in Figure 5, thus com While we have'shown and described precise operating steps, it is to be understood that the 15' ‘ drawings and descriptive matter are to be inter pletely closing the tube end and bringing the preted in an illustrative rather than a limiting end edges initially into abutment in the irri'me sense, since various modi?cations may be made diate region of the longitudinal axis of the work within the scope of the appended claims. piece l2. At this stage of the method?there We claim: 7 will be present a ?ssure f in the zone of initial 20v l, A vmethod of spinning closed ends on tubular abutment of the end’ edges of the tube. There metal workpieces, comprising rotating ‘the work after the tool 30 is given a plurality of additional piece and applying a work-engaging tool to the arcuate sweeps to the position. indicated in end vportion thereof, moving said tool through Figure 6, where the working face of the tool arcs extending from the periphery toward'the crosses the longitudinal axis of the end of' the 25 longitudinal axis of the workpiece, moving said workpiece. This is for the purpose of building tool longitudinally of the axis‘ of the workpiece up worked metal of substantial thickness with ‘to bring the end edges of said workpiece into out 'a-?s'sure, beyond the original point of junc abutment in the region of the longitudinal axis ture of the end edges. This condition is illus thereof, and thereafter‘ continuing the movement 30 trated in Figure 6, wherein it‘ is noted that the of said tool in-arcs extending from the periphery ?ssure ends at the'point j’, and the metal beyond to‘the point beyond'the longitudinal axis of the that point is entirely devoid of a'fissure and is workpiece to upset said end portion and build thus rendered vmore dense so that it is thereby upmetal of substantial thickness without a ‘?s made capable ofwithstanding' considerable pres sure outside the original pointv or juncture of 35 said‘ edges, stopping rotation of the workpiece, Upon completion of the ‘operation represented then extruding‘the axial portion of said closed in Figure 6, the workpiece is removed from the end inwardly'into an axial cavityin a die mem chuck l0 and the end thereof is entered into her in the'region of the point of juncture of the cavity 38 of a die 4!). Thereupon another said edges," said extruding step causing feather die ‘42 having a central recess 44 therein is 40 like portions to be ,forced axially into said die forced inwardly, with‘the result that feather cavity,‘ and ?nally‘ removing said axially ex like portions 46 located in the longitudinal cen truded feather-like portions; ‘ I i . tral axial region "of'the' workpiece and flanking ' 2; The method of claim 1, further‘ character the central ?ssure, are forced inwardly into, the ized-~ by the step of facilitating the upsetting sure. ' ‘ ' recess 44 of the die 42'.‘ “Ifhe- die 42 is then re_ ' moved and the work-piece is disengaged from the die '42. v‘The workpiece is then chucked in a suit able‘ metal working tool such'as a lathe or the like, and a cutter bar 48 centered by- aguide ‘rest 5!) and carrying a spade or similar cutting tool 52 is ‘brought into play, so as to ‘machine operation by‘directing heat locally against the _ end. portion of the workpiece while. actuating said tool to upset ‘the end portion of the work. JOSEPH J. -BEDNAR. STEVEN P.v PECK.