US3050023A - Tube spinning machine - Google Patents

Description

INVENTOR JAMES D. BROWN Aug. 21, 1962 J. D. BROWN TUBE SPINNING MACHINE Filed May 29, 1959 ATTORNEYS Aug. 21, 1962 J. D. BROWN TUBE SPINNING MACHINE 7 Sheets-Sheet 2 Filed May 29, 1959 INVENTOR JAMES D. BROWN ATTORNEYS Aug. 21, 1962 J. D. BROWN TUBE SPINNING MACHINE 7 Sheets-Sheet 3 Filed May 29, 1959 INVENTOR LLH-25 FIG.3

JAMES D. BROWN ATTORNEYS Aug. 21, 1962 J. D. BROWN 3,050,023

TUBE SPINNING MACHINE Filed May 29, 1959 '7 Sheets-Sheet 5 FIG.9.A

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INVENTOR JAMES D. BROWN ATTORNEYS Aug. 21, 1962 J. D. BROWN TUBE SPINNING MACHINE '7 Sheets-Sheet 6 Filed May 29, 1959 INVENTOR JAMES D. BROWN BY ,awez y ATTORNEYS 3,050,023 Patented Aug. 21, 1962 fiice 3,050,023 TUBE SPINNING MACHINE James D. Brown, RD. 2, Box 300A, Halifax, Pa. Filed May 29, 1959, Ser. No. 816,927 3 Claims. (Cl. 113-52) This invention relates to improvements in tube spinning machines and particularly to the formation of closed end tubes from preformed cups, pierced billets or plate stock.

The apparatus according to this invention is for the forming of closed end cylinders of the heavy duty type as are used for storage of oxygen, acetylene, etc. The initial closed end cylinder is formed on this apparatus and is worked down further and has a neck formed thereon by other suitable machines. The closed end rough cylinder has heretofore been punched out of a billet and the walls have been very nonuniform. By the hereinafter described apparatus blank closed end cylinders are formed having very uniform wall thickness throughout and thus a much better product that is finally finished as a high pressure gas container is ultimately able to be formed.

It is an object of the invention to form on a single machine a closed end tube from preformed cups, pierced billets or a piece of plate stock.

Another object of the invention is to provide spinning apparatus for readily forming a closed end tube wherein the wall thickness is maintained uniform throughout its circumference and length.

A further object of the invention is to provide a closed end tube spinning machine which is double-ended having oppositely positioned rotated mandrels over each of which is formed a closed end tube by means of axially and radially movable rollers.

A still further object of the invention is to provide a double-ended rotating mandrel type of tube spinning machine in which a blank of sheet stock is utilized and clamped over the end of each rotating mandrel by an axially and transversely movable pressure member whose transverse movement after axial movement to release the cylinder on the mandrel permits removal of the formed closed end cylinder after spinning.

Other objects of this invention will in part, be obvious and in part appear hereinafter. This invention is disclosed in the embodiment thereof shown in the accompanying drawings and it comprises the features of construction combination of elements and arrangement of parts that will be exemplified in the construction hereinafter set forth and the scope of the application of which will be indicated in the appended claims.

For a more complete understanding of the nature and scope of this invention, reference may be had to the following detailed description, taken together with the accompanying drawings in which:

FIG. 1 is a front elevation of the center and left-hand end of the duplicate-ended spinning machine;

FIG. 2 is a top plan view of the machine shown in FIG. 1;

FIG. 2a is a section of the tailstock mounting along line 2A-2A of FIG. 2 on an enlarged scale;

FIG. 3 is a vertical section along line 3-3 of FIG. 1 on an enlarged scale showing the mounting of the tailstock and its operator for transverse movement to permit removal of a formed-up closed end tube;

FIG. 4 is a vertical section along line 4-4 of FIG. 1 on an enlarged scale and showing the mounting and movement of tri-rollers;

FIG. 5 is a vertical cross section on an enlarged scale along line 5-5 of FIG. 4 showing a roller mounting and lubrication of same;

FIG. 6 is an enlarged scale view along line 6-6 of FIG. 1 showing the upper top rails and idler motor mounting and drive of mandrel shaft;

FIG. 7 shows a roller arm mounting of one of the arms in FIG. 4 on an enlarged scale and the combined lubrication and cooling lines leading to the bearing thereof;

FIG. 8 is a sectional view on line 8-8 of FIG. 7 showing the bearings of the roller mounting on a further enlarged scale;

FIG. 9 is the forward end on an enlarged scale of the tailstock structure;

FIG. 9A is the other end, the rear end, of the tailstock shown in FIG. 9; and

FIG. 10 is a diagrammatic layout of the power cylinders for the various components and the supply of fluid controlled thereto.

Throughout the description like reference numerals refer to similar parts.

A base generally indicated at 10 forms the main frame of the machine. This base or main frame had bed plates 11 extending to either side as at 11 and 11', shown in FIG. 1, an integrally formed and extending upward from the center portion is a center section 12 having bifurcations 13 and 13 which extend up as mounting members. Each of these members 13 and 13' has a central bearing recess generally indicated at 14 in FIG. 6 to receive the tapered bearings that mount the mandrels, as will be explained.

At each of the ends of the upstanding bifurcated member 13, see FIG. 6, there is a threaded aperture 15-15 to receive cap screws 16 which secure respectively on each upstanding bifurcation a vertical support 17 which has a notched-out center portion 18 to receive a motor mounting M and V-shaped slots 19 on either side to receive longitudinally extending top rails 20-20. These top rails are secured on the member 17 by means of cap blocks 21 which have a vertical aperture therethrough to receive cap screws 22 that are threadedly received in apertures 23 formed in the vertical members 17. These vertical members or top rail supports 17 are positioned on each of the upstanding bifurcations 13 and 13', as shown in FIG. 1. It will be noted that the lower face of the cap blocks 21 has a V-shaped recess 21a therein oppo site the recess 19 in the rail support member 17 so as to receive the rails which, in this instance, are substantially square shape in cross section.

A tailstock support generally indicated at 24 that supports the outer ends of the rails 20-20 and certain power apparatus will now be described. Reference to FIG. 3 shows the left base end 11 having mounted on either side lower rails 25-25 having upwardly extending V-shape bearing surfaces 25' and apertured with vertical apertures 25" to receive securing screws 26 which extend up into the threaded apertures 24' in the base of tailstock support 24. The tailstock support 24 and its mounting best shown in FIG. 3 is formed with square recesses at its upper corners as indicated at 27 which have threaded aperture 27 at their base and receive the outer ends of the top rails 20 which are secured by cap screws 28. The tailstock support 24 is formed with a slideway 29 from top to bottom in the right-hand face as shown in FIG. 2. Each side of the slideway 29 is formed with tapered shoulders 29 within which is slidably received the mounting plate 30 for the tailstock. This mounting plate 30 has dovetail edges and is held within the slide receiving recess 29 by gibs 31 as shown in FIG. 2 which take up the slack and provide a proper slide fit for the plate 30. In the partly raised position of the plate 30 as shown in FIG. 3, the upper edge is at position a and its lowered position would be shown from the top edge a as in broken line while the two respective positions for the bottorn edge are at b and b. Adjustable positioning of the plate on downward movement is alforded by the screws 32 extending up through bed 11 into threaded apertured blocks-33 positioned on the top surface of the bed 11. Locknuts 34 serve to lock the screws 32 in adjusted position. In FIG. 3, the tailstock support 24 has an aperture 35 formedtherein extending from front to back and in line with the central apertures 14 and 14', see FIG. 1, in which lies the axis of the mandrel to be. described. Thus, a cylinder formed on the mandrel as will be described may be removed through the aperture 35 when the tailstock slide 30 is elevated to extreme top position. The description of the tailstock will continue. In the tailstock support 24 there is an elongated aperture 38 having the bottom 38 in line with the aperture 35in the plate 30 when the plate 30 is in down position. Extending through an aperture 39 in the upper portion of plate 30 is the tailstock or fluid pressure actuated jack generally indicated at 37 in FIGS. 1 and 2. In order to accommodate the sliding movement of the tailstock 37 with its mounting plate 39 an elongated cutout indicated by the broken lines 38 in FIG. 3 in tailstock support 24 extendsupward from the bottom 38' in line with aperture 35 in the plate 30. This cutout portion 38-68 permits the tailstock to be moved up and down in member 24. Thus, the tailstock 37 is lowered to place the axis thereof on the axis of the mandrel, as will be explained.

The tailstock 37 is shown in FIGS. 9 and 9A on an enlarged scale and is provided with a transversely extending apertured flange 39 having apertures 39 therein in its outer main body to provide for mounting of the same on plate 30. This flange 39 is shown mounted in FIG. 2 and FIG. 3 by means of cap screws 40,. see FIG. 2, which extend into threaded apertures in the plate 3%. Attached to the top of tailstock support 24 for the tailstock isthe horizontal plate 41, see FIG. 3, on which is mounted a .tailstock actuating power cylinder generally indicated at 42 having a lower flange 42 that is secured by screws 42" to the mounting plate 41. This power cylinder 42 has a piston rod 43 which is secured to the plate 30 as at 43'; Thus, when fluid pressure is applied at 42a, see FIG. 1, the power piston is moved down and plate 39 is moved down to position the tailstock37 in position in axial alignment with a mandrel 51 to be described. The other power lead to the power cylinder 42'for the tailstock is indicated at 4212 at the lower end of the cylinder. The details of the structure and operation of the tailstock 37 as shown in FIGS. 9 and 9A will be explained hereinafter.

Also attached to the tailstock mounting plate 24 in horizontal. position towards opposite edges thereof as shown in FIGS. 2 and 3 are power cylinders 110 and 115 as by means of a conventional mounting collar arrangement 111 for cylinder 110 and 116 for cylinder 115.

The plate 24 is apertured at 111' and 116 and extending respectively therethrough is the piston rod 112 for cylinmandrel shaft when power on the V belts as shown in FIG. 2 in broken line is removed on the main drive motor (not shown). The motor M shown in FIG. 1 and connected by belt 49 to one of the grooves of the V belt pulley 46 is merely for turning over the mandrel shaft 45 during adjustment, cooling, etc. and not while spinning. The shaft 45 is formed on each end with a properly threaded portion indicated at St) in FIG. 1 for the left-hand side to receive the internally threaded mandrel generally indicated at 51. The mandrel 51 has formed thereon ashoulder portion at itsinner end, as indicated at 52, and a dimple or recess in the end at 53 into which plate stock to be formed into a closed end cylinder is pressed by the tailstock plunger, as will be described.

The mandrel 51 is here shown as cylindrical and is the member about which the closed-end cylinder is to be formed by the spinning action.

T ailstOck Assembly In FIGS. 9 and 9A the tailstock generally indicated at 37 is shown in detail. The left-hand end as illustrated in FIG. 9 joins on with the right-hand end as shown in FIG. 9A in the illustration, however, the tailstock is mounted on the left-hand side of the apparatus in a reverse manner, as shown in FIGS. =1 and 2. This tailstock is here illustrated as being hydraulically actuated and has a cylinder 54 with a flanged forward end 39having mounting apertures 39' therein as previously described. The rear end is formed with a transversely extending flange 55. This flanged end 55 has a central aperture 56 which receives arod 57 having longitudinal apertures 58 and 59 extending the length thereof to receive a supply of cooling and lubricating oil in one and to exhaust through der 110 and 117 for cylinder 115. Each of the cylinders 110 and 115 have fluid power supply connections 110a and 11017 for cylinder llii'and 115a and 115i) for cylinder 115 in the respective ends. The tailstock power cylinder has fluid pressure connections at 37a and 37b.

Mandrel Mounting v Mounted in the bifurcated uprights 13 and 13 in the respective center apertures 14 and '14, see FIG. 1, are tapered roller bearing assemblies 43 and 44 respectively which are held in position by the respective pillow blocks or caps 17 and 17'. Rotatablysupported in these bearings is a mandrel shaft 45 having formed thereon a special V-groove pulley'arrangement consisting of some 18 V belt grooves as indicated at 46 and especially formed brake drum portion 47 about which is mounted a brake drum 48. Suitable means are provided for operating the brake drumi48 to slow down, the rotation of the the other... The rear end of the rod 57v has a keyway 60 formed therein and is threaded at '61 to receive adjusting nuts 62 and 63 to hold a stop plate 64 in adjusted position thereon. The stop plate 64 has a keyway 64 therein and receives a key 65 which extends therein and into the keyway 60. Stop plate 64 as shown in FIG. 2A has apertures .66 and 66 extending therethrough to receive the respective guide rods 67 and 68 which are threadedly secured at their inner ends 67 and 6-8 in threaded sockets '69 and 70 formed in end flange plate 55 of the cylinder member 54. Thus, the adjusting nuts 62 and 63 may be moved to position the stop plate 64 and in such positioning will determine the length of travel of the rod 57, which is attached. to the piston whose length of. travel towards the mandrel deter-mines the thickness of the bottom of the cylinder being formed. The forward or inner end of rod 57 is threaded at 57.

A specially formed piston 71 has an internally threaded rear end 72 which receives the threaded end 57 of rod 57. Extension of oil passages 58 and 59 are indicated at 58' and 59 in the piston 71 so that. oil may be sent to and removed from the internal forward end of the piston which mounts the rotary member as will be described. Suitable packing glands generally indicated at 73 are formed in the cylinder 54 at the left-hand end thereof as shown in FIG. 9. Piston 57 has a head portion geuerallyindicated at 74 which has, as indicated, three ring-receiving annular recesses 75' to receive the rings 76. This head portion 74 is of slightly greater diameter than the main portion of the piston,71 where it passes through the packing glands 73. The left-hand end as shown in FIG. 9 of the piston 71 has an internal cavity made up of stepped and tapered parts as will be described. Starting at the left-hand end as shown in FIG. 9 is a short cylindrical portion 77 having a packing gland portion 77' to receive the packing gland 78. An inwardly tapered portion 79 joins with an internally threaded portion 80 which joins with a slightly smaller diameter bearing receiving recess 81 that extends for over half the length of the internal cavity to a shoulder portion 82 which joins with an extreme inner end cavity 83 of slightly smaller diameter.: A ball bearing assembly 84 mounts in cavity 81 against the shoulder 82 and forward of this abutting same is a sleeve or spacer 85 against whose forward end the forward bearing assembly 86 abuts. An externally threaded retainer ring $7 is received in the threaded portion 8%} and holds the bearing assembly 86 in place against the sleeve 85.

Mounted within this internal recess portion in the piston 71 is a plate-engaging rotary member generally indicated at 88. This rotary member 88 is formed with a cylindrical outer end or head 89 having a protruding spherical portion 9% whose outer curvature corresponds with the concave shaped end surface or dimple 53 in the end of the mandrel 51. Next in from the head 89 is a cylindrical body 91 received within the packing gland 77' and the recess 77 and this portion 91 joins with a tapered portion 92 of like taper to the tapered portion 79 of the cylinder 71. The rear end of the tapered portion 91 joins with a cylindrical journal portion 93 which is slidably mounted within the bearing races 84 and 86 and has midway its length an annular reduced in diameter portion 94 of relatively short length axially within which is received a stop screw 95 threadedly mounted in an aperture extending radially within the piston 71 at 96 and having a countersunk portion at 97 to receive the head 95 of the stop screw 95. Spacer 85 is apertured at 85 so that screw 95 may pass therethrough. Formed in the inner end of axially movable and rotary member 88 is a rear end recess 83a terminating at its bottom in a smaller diameter recess portion 8812 which receives a thrust bearing 98.

Mounted against the thrust bearing 98 is a circular plate 99 received within the smaller inner end cavity 83 of the piston 71. This plate 99 has a forwardly projecting centrally disposed boss 99 and a rearw-ardly extending boss 99". The forwardly extending boss 99' is received within the bearing assembly 98 and the rearwardly projecting boss 99" receives thereabout the heavy duty compression coil compression spring 113d which extends to the rear of cavity 83 and presses against the plate 99 about the boss 99". When the piston 71. is forced to the left by pressure applied at 37b, see FIG. 9A, the rotary and axially movable member 88 moves from the broken line to the full line position and tends to compress spring 109 while the spherical protrusion 90 on the end of 88 seats against a plate, a preformed cup or a pierced billet to be formed into a cylinder and pushes and forms the bottom end of the cylinder being formed up against the dimple 53 on the end of the mandrel 51 to hold it firmly in place while the spinning rollers as will be described act to spin the plate or the stock into a tube. Movement of the piston 71 to the right or to a retracted position from engagement with the plate or stock is accomplished by means of reversing the flow of hydraulic pressure and applying it at aperture 37a, see FIG. 9, at which time the flow through aperture 37 b is reversed. Flexible pressure carrying conduits (not shown) are attached to the respective apertures 37a and 37b. Cooling of the rotary and axially movable member 88 is accomplished through the oil supply through the ducts 5858' which lead to the journal portion 93 and exhaust through the conduits 59'S9. The conduits or passageways 5S and 59 are connected respectively to flexible supply leads S8 and 59". The oil passing around the journal 9-3 also serves to lubricate the bearings 86, 84 and 93. portion 92 and lubricates the journal portion 91 riding in the cylindrical portion 77 adjacent the packing 77. A suitable cooling system (not shown) is provided whereby the lubricating and cooling oil is cooled.

In FIG. 1 there is shown attached to aperture 37a in the tailstock cylinder 54 a solenoid operated valve generally indicated at 370. A suitable hydraulic connection 37d is associated with this valve 370. When bottom forming pressure is applied to piston 71, this solenoid operated Oil also eases up the taper 6 valve 370 is in a closed position and is bypassed. When the bottom end of the ultimate cylinder is being formed mandrel 5- 1 is stationary. After the bottom is suitably formed and at the time the main drive motor is started and operates to carry out a spinning step on the stock, the solenoid operated valve 37 c opens and the fluid bypasses to an adjustable pressure relief valve (not shown) whose pressure is set to be overcome by the normal and inherent pressure of spring 101). This action allows the piston 71 to move to the right, as viewed in FIGS. 9 and 9a, relative to the rotary member 88. In this latter condition the relative position of rotary member 88 will be as shown in broken line. In this latter condition the rotary member 88 is rotating and thrusting against the thrust bearing 98.

Spinner Rollers and Mounting Reference to FIGS. 1, 2, 4 and 5 shows the spinner roller mounting plate or cross head 101 having a circular-like shape as shown in FIG. 4 with a bottom portion 1% having vertical sides 102 and on either side a cutout V portion 193 which is received over the tracks 25 and the inverted V-shaped portions 25' thereof mounted on the bedplate 1 1. In the upper portion of plate 191 are cutouts 104 having vertical faces 104' to receive the upper rails 21} so that the plate 101 may be slid along the bottom and top rails to urge it toward and away from the mandrel 51 as will hereinafter be described. In FIG. 1 the plate 1151 is shown formed with flanges 105 extending outwardly from either side adjacent the rail cutouts to act as guides along the rails 25' while integral flanges 106 are likewise provided at the tops adjacent the cutouts 104 to guide the plate 161 along the rails 20.

Along the horizontal diameter of plate 101 and towards the outer sides thereof, there are apertures 107 and 108 to receive piston rods of the power cylinders 11-0 and 115 used to move the plate 101. Power cylinder 110 has fluid pressure connections 1 10a and 11012 which supply pressure to the pressure cylinder. A mounting collar generally indicated at 111 serves to mount the pressure cylinder 1110 on the ta-ilstock support 24. Piston rod 112 of the power cylinder 11% projects through tailstock support 24 in a suitable aperture formed therein and its end is received in aperture 107. The end of rod 112 is threaded at 113 as indicated in FIG. 2 and receives a securing nut 114.

A cooperating power cylinder 1 15 is mounted also on tailstock support 24 and has hydraulic connections 115a and 11%. A suitable collar mounting 116 mounts the cylinder 115 to the tailstock support 24 and its piston rod 117 extends through the tailstock support 24- and through aperture 168 in plate 181 where it receives a nut 119 to hold it in place.

Referring to FIG. 5, the plate 191 has a cylindrical recess 120 in the left-hand or forward face thereof joining with a slightly larger cylindrical recess 121 having a bottom wall 122 joining the two recesses. A circular cam plate 123 is received in the recess 120 and this plate is formed with an annular flange 123' againstwhich is mounted a securing ring 124 having suitable apertures 125 to receive cap screws 125 which are received in threaded recesses 126 in plate 191. A plurality of these cap screws 125' spaced apart are shown in FIG. 4.

In the illustration shown, cam plate 123 has associated therewith three spinning rollers, however, four or more rollers might be utilized. A roller arm is indicated at 130 which is elongated and narrow at one end and larger at the other. At the narrower end there is an aperture 130' which receives a cap screw 129 securing the arm to plate 101. Reference to FIG. 8 shows a general recess 13d extending therethrough having a front bearing recess 132 and a rear bearing recess 133. Associated with the front bearing recess 132 is a retainer recess for the oil seal for the front bearing as indicated at 134 to receive a front bearing oil seal 135. The rear bearing recess 133 has an associated larger rear recess 1136 outward thereof, to receive the rear oil retaining cover plate 137 which is se cured bycap screws 133 received in apertures 138' in arm 130.- Received in the front bearing recess =13; is a front bearing assembly 140 and in the rear bearing recess 1133 a rear bearing assembly 141. These bearings receive a roller shaft 142 having a threaded rear end 143 which receives a securing nut 144. The forward end of shaft 142 is tapered at 145 to receive a spinner roller 146 having a forward tapered spinning surface 146. The rollers 146 may be diflerent-ly shaped. In FIG. 8 there is shown a passageway 147 to supply lubricating and cooling oil and a discharge passageway 148 for the oil. These connect with supply exhaust lines 147' and 147" and the exhaust line 148' and the flexible connection 148" as shown in FIG.-7. These flexible lines 147 and 14S" connect with fittings so that oil supply is through a passage 15% in plate 101 that connects with an manifold 159a while 148" connects with passage 151 and manifold 151a. The plate 123 has a cam groove 152 therein which is of arcuate shape and receives a guide screw or stud 153 that is threaded into an aperture 154 in arm 139. The head of screw 153 is received within a slot 152' on the reverse side of plate 123. Access to install screw 153 is through the aperture 155 in plate 101 as shown in FIG. 5. Rotation of cam plate 123 is under the control of a power cylinder generally indicated at 156 in FIG. 4. A lug 101a extending from the mounting plate 101 has a pivot pin 157 mounted therein on which is pivotally mounted the power cylinder156. The power cylinder 156 includes a cylinder portion 158 and mounting portion 158' which may be termed a mounting portion. Power cylinder 156 has fluid pressure connections 158a and 158i). Suitable flexible fluid pressure conduits are connected to the respective connections 158a and 151%. A piston rod 159 extends from the power cylinder 156 and is attached to the plate 123 in a pivotal manner by apivot pin 160.

By use of the power cylinder 156 and the controls therefor as will be explained hereinafter, accurate control of movement of plate 123 is obtained and thus movement in and out of the roller assemblies 127 against the stock being formed into a closed end cylinder is ob tained. :The roll carrying plate 101 is under the control of the power cylinders 110 and 115 for axial movement. The central aperture 123a in plate 123 allows the mandrel 51 with the plate formed thereover as a closed end tube to extend therethrough in the formation and spinning of the plate about the mandrel 51.

Aperture 123a in the cam plate is in alignment with the aperture 38' in tailstock mounting plate 24.

. A spray system for conducting cooling fluid to cool the mandrel 51, as may be necessary, is indicated in FIGS. 1 and 2. at 161. It includes, for example, three nozzles 162 and a supply conduit 163. Spraying may be done while machine is waiting conveyance of next plate or preformed billet to be spun and at this time motor (in) will be actuated and slowly rotates mandrel 51 for even cooling.

Fluid Pressure System In FIG. there is shown diagrammatically the hydraulic fluid supply system used with this tube spinning machine. A motor driven pump having connected therewith a reservoir 'as labeled in FIG. 10, supplies the fluid under pressure to the respective control valves V1, V2, V3 and V 4. In the system shown provision is made for counteracting forces since the mandrels 51 and 51 are positioned oppositely and axially in alignment. Valve V1 operates the pressure actuators 156 and 156' to rotate cam plate123. Valve V2 applies pressure under control to the pressure cylinders 42 and 42' to move the tailstocks 37 and 37' up and down while valve V3 is the control for the pressure actuator 37 and 37 for the tailstock to move the rotary member 88 against the stock which is held firmly against the end of the mandrel 51 and'which' forces in the arcuate bottom thereof in the recess 53 as shown in FIG. Valve V4 cont ols the 3 pressure to the respective pressure actuators and and 110 and 115' to 'move the respective plates 101 carrying the rollers which work down the respective stock pieces into the respective cylindrical containers.

A highly eflicient machine for forming a closed end cylinder from preformed cups, pierced billets or plates is provided. The tailstock pressure applying jack 37 to hold the plate or stock on the mandrel is mounted so that it is removed from axial alignment with mandrel 51 to permit insertion of a preformed cup or pierced billet and ready removal of the formed cylinder. Very accurate and uniform wall thickness closed at one end cylinders of the heavy duty type may be readily made from preformed cups, pierced billets or plate stock. It is intended that the material being worked would be adequately preheated to render it more readily formable. However, cold forming of relatively small thickness material or stock could be handled. While an arrangement of three rollers for carrying out the spinning has been shown, four or more roller arrangements might be utilized.

I claim as my invention:

1. Apparatus for making cylinders closed at one end, comprising, in combination, a frame having a central upstanding portion and integral bed plates projecting generally horizontally in opposite directions at the bottom thereof, said central portion having bifurcated bearing members projecting upward therefrom, upstanding cap blocks received over said bearing members and having longitudinal upper rail receiving means in their top portions, a mandrel member received in said bearing members and having mandrel portions at opposite ends and a drive pulley thereon positioned between said bifurcated bearing members, said bed plates having longi tudinally extending spaced apart bottom rails thereon extending parallel to the axis of said mandrel member, a fluid pressure actuated jack for each end of the apparatus for clamping stock to be formed against the end of each mandrel portion, upstanding mounting means for each jack on each projecting bed plate permitting them to be moved transversely into and away from axial alignment with the mandrel and a stock engaging portion thereof axially toward and away from said mandrel to hold stock thereagains't to be formed, said jack mounting means having an aperture therethrough for movement of a formed closed end cylinder therethrough and upper rail mounting means thereon in alignment with the upper rail mounting means on said cap blocks, upper rails mounted in said upper rail mounting means and extending parallel to the axis of said mandrel member, a cross head mounted between said bottom and upper rails for sliding movement along said rails between each jack mounting means and the adjacent mandrel portion, said cross head having a central aperture for movement of the adjacent stock engaging portion of the jack therethrough and removal of a formed closed end cylinder, a circular recess in the face of each of said cross heads nearest the adjacent mandrel portion, a rotary circular plate member mounted in said recess in the cross head, said rotary plate having a central aperture therethrough in axial alignment with said aperture in the cross head and the axis of said mandrel member, roller mounting arms pivoted at their outer ends to the said cross head, spinning rollers rotatably mounted on the inner ends of said arms and projecting toward said adjacent mandrel portion for engagement with the stock to shape it over said adjacent mandrel portion, said rotary plate having arcuate cam means, cam guide means connected with said cam means and to said arms, means for rotating said rotary plate whereby said roller mounting arms carrying the spinning rollers are rotated to move said rollers toward and away from the axis of said mandrel member and means to move the cross head toward and away from said adjacent mandrel portion to bring said spinning rollers into working engagement with the stock.

2. Apparatus for making closed end cylinders according to claim 1 wherein said roller mounting arms have anti-friction bearing means mounting said rollers thereon and lubricating supply and exhaust means are provided for said anti-friction bearings to lubricate and cool the same.

3. Apparatus for making cylinders closed at one end, comprising, in combination, a frame having a central upstanding portion and integral bed plates projecting generally horizontally in opposite directions at the bottom thereof, said central portion having bifurcated hearing members projecting upward therefrom, a mandrel member received in said bearing members and having mandrel portions at opposite ends and a drive pulley thereon positioned between said bifurcated bearing members, said bed plates having longitudinally extending spaced apart rail means extending parallel to the axis of said mandrel member, a jack means including a stock engaging portion for each end of the apparatus for clamping stock to be formed against the end of each mandrel portion, upstanding mounting means for each jack on each projecting bed plate permitting them to be moved transversely into and away from axial alignment with the mandrel and the stock engaging portion thereof toward and away from said mandrel to hold stock thereagainst to be formed, said jack mounting means having an aperture therethrough for movement of a closed end cylinder therethrough, a cross head mounted on said bottom rail means for sliding movement between each jack mounting means and the adjacent mandrel portion, said cross head having a central aperture for movement of the adjacent stock engaging portion of the jack therethrough and removal of a formed closed end cylinder, spinning rollers having mounting means mounting them on said cross head in spaced position about the axis of said mandrel member for movement toward and away from said axis of the mandrel ember, power operating means for movement of said mounting means for the spinning rollers and means to move said cross head toward and away from said adjacent mandrel portion to bring said spinning rollers into working engagement with the stock as said rollers are moved by their mounting means.

References Cited in the file of this patent UNITED STATES PATENTS 380,785 Bogert Apr. 10, 1888 1,389,216 Potter Aug. 30, 1921 1,677,131 Cole et a1. July 17, 1928 1,836,921 Harrison Dec. 15, 1931 2,160,975 Matter et a1. June 6, 1939 2,192,436 .Groene Mar. 5, 1940 2,249,148 Lovely July 15, 1941 2,251,885 Indge Aug. 5, 1941 2,264,060 Whyte Nov. 25, 1941 2,300,967 Reed Nov. 3, 1942 2,347,175 Dewey Apr. 25, 1944 2,545,852 Kurzweil Mar. 20, 1951 2,653,561 Stiefelmayer Sept. 29, 1953 2,809,078 Hartwi-g Oct. 8, 1957 2,864,329 Woods et al. Dec. 16, 1958 2,902,963 Roberts Sept. 8, 1959 2,910,905 Garnet Nov. 3, 1959 FOREIGN PATENTS 6,789 Great Britain Apr. 2, 1895 16,526 Great Britain Sept. 17, 1903 539,991 France Apr, 10, 1922 396 Switzerland Ian. 30, 1889 OTHER REFERENCES American Machinist, Oct. 7, 1957, page 164.

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