Патент USA US2128152код для вставки
Aug. 23, 1938.’ > H. F. MacMlLLlN 2,128,152 AUXILIARY-HYDRAULIC DEVICE FOR PRESSES ‘- ______F/' Filed Aug. 16, 1934 ' s Sheets-Sheét 1 /. 2+ ‘V U 3/ Q © O 0 5» 4 A TTORA/EYS Aug. 23, 1938. H. F. MacMlLLlN 2,128,152 AUXILIARY HYDRAULIC DEVICE FOR PRESSES Filed Aug. 16, 1954 ' 5 Sheets-Sheet 2 8 32 ‘ 34 By J 40 2 34 32 Aug. 23, 1938. 2,128,152 H. F. MaOMILLIN AUXILIARY_HYDRAULIC DEVICE FOR PRESSES Filed Aug.‘ 16, 1954 5 Sheets-Sheet 5 27 W 5 Aug. 23, 1938- 2,128,152 H. F. Mac‘MILLIN AUXILIARY HYDRAULIC DEVICE FOR PRESSES ' Filed Aug. 16, 1954 5 Sheets-Sheet 5 3/ 4 ,. M/Vf/VTOR #014491?” I‘: MAGM/lLl/V. :Y a ATTORNEYS Patented Aug. 23, 1938 . 27,128,152 UNITED STATES PATENT. OFFICE AUXILIARY HYDRAULIC vDEVIOE FOR ‘ PRESSES Howard F. MacMiilin, Mount Gilead-Ohio, as signor, by ‘memo assignments, to The Hydrau lic Press Corporation, Inc., Wilmington, Del., a corporation of Delaware '. Application August __16, 1934, Serial Ne. 740,148 10 Claims. (or. loo-Jo) the auxiliary pressing cylinder located in the bed This invention relates to :presses, and espe of the press instead of in the platen; ‘ cially to those having theirj"platens moved by non-hydraulic means. i ' Figure 6 is a diagrammatic view of a circuit whereby the pressing ram in Figure 4 may be ' One object of my invention is to provide a Ci press having a platen moved»; by any convenient means whether hydraulic or ‘non-hydraulic‘, and lifted with the assistance of an external source of pressure, such as air; Figure 7 is a front elevation partly in section of a hydraulic circuit whereby the press may be given a. two-stage-eifect‘ through a booster action devices for generating ?uid pressure operated by the motion of the platen, the fluid pressure thus generated being available for operating various contributed by the generator pistons; hydraulically-actuated devices, and/or provid 10 Figure 8 is a vertical section through a pilot ing pressure control. Another object is to provide, in a press operated operated check valve ‘(employed in the present by non-hydraulic mechanism, means for giving . the press a hydraulic effect and hydraulic'pres ’ Press with single-acting generator rams circuit. ' sure control. ’ ' - -. Refe'rring to’the‘drawings; in ‘detail, Figure 1 Another object is to provide a press having a shows a. press havinsi‘ia, base 1| Joined" by side _ ~ mechanically-operated platenwith hydraulic de vices soconnected that the motion of the platen members 2 to the top'niember 8, asby'the strain, . causes these devices to generate ?uid pressure, rods 4 on which are .threadedithe nuts 5‘. .Mount4;26 this being \utilized to actuate an.‘ auxiliary hy ed on the base I ma work table or bed 8., draulic ram for-exerting a hydraulic effect and giving a pressure control upon the work pieces, with ‘guide portions 1‘ adaptedto receive a press with the speed of a mechanical press. ' ' The side members" 2:: of the press are equipped v platen 8 for longitudinal reciprocation. The ‘keeping of the platen 8 in engagement with the ‘ Another objectis to provide a press having a platen, movable by whatever means, with de vices attached thereto for generating ?uid pres guide portion 1 is assisted by the ‘retaining plates‘v _ 9 bolted to the side. members 2 of the press. ,1 __ The press platen 8 may be movedin any con operated by this fluid pressure and adapted to vvenient manner, such as mechanically .or hy give‘ a pressure-controlled pressing effect: this, draulically. For purposes of illustration,‘ a gear- ' 30v auxiliary hydraulic ram being located in any driven mechanical crank press is shown, but desired place,’such as in the platen or‘the bed other types may be used without departing from sure, together with an auxiliary hydraulic ram of the press. - the scope of my invention. ' Another object is to provide a platen-operated hydraulic generating arrangement of the above mentioned type, the auxiliary hydraulic ram and the hydraulic generator rams being of a double¢ acting nature so that the upward motion of the main platen retracts the auxiliary hydraulic ram. In the drawings: 4O Figure 1 is a front elevation, partly in section, of a press embodying single-acting hydraulic generator rams and a single-acting auxiliary hy draulic ram; , ’ ' Figure 2 is a side elevation of the press shown in Figure 1, partly in section, along the line 2—2 of Figure 1; ~ Figure 3 is a horizontal section'along the line 3-3 ‘of Figure 1; ' Figure 4 is a front elevation, partly in section, of a portion of the press shown in Figure 1, but illustrating the use of double-acting generator rams in connection with a double-acting auxiliary hydraulic ram; 65 Figure 5 is a View similar to Figure 1, but with : ‘In the form of. press shown, ‘the platen 8 is provided with a cross shaft l0 journaled in bear 35 ings _II on the upper portion of the platen 8. Pivotally engaging the cross shaft I0 of the ' platen 8 is a connecting rod I! having a lower bearing l3, surrounding the cross shaft l0. At its upper end, the connecting rod I2 is provided with an upper bearing I4, which surrounds the 40 crank portion ii of the main drive shaft vIii. The latter is journaled in bearings I1, mounted upon the side members 2 of the press. The driving end of the main drive shaft I6 is provided with a gear l8 for this purpose. The 45 gear I8 is ‘connected by a clutch mechanism with in the clutch housing IS in such a manner that the gear l8 may be connected or disconnected from the main drive shaft I6, as desired. The clutch mechanism within the clutch housing I9 is 50 actuated by the crank arm 20 mounted on the clutch shaft 2| and connected by the link 22 to the pedal rod 23. The latter is reciprocably supported in ‘the bosses 24 attached to. one of the » side members 2, and is secured at its lower end 65 » - 2 2,313,102 by the pivotal connection 25 to the foot pedal 25. By depressing or releasing the foot- pedal 28, the downwardly. Thus the auxiliary pressing ram 38 is a positive-acting hydraulic‘ plungerwwhich gear l8 may be made to operatively engage the‘ - performs actual pressing work by ,moving3 posi main drive'shaft It, or rotate loosely-upon it. in this manner, the foot pedal 28.controls the press to provide for its executing working strokes or for its remaining idle, as may be desired. ' The gear I8 is driven by a pinion 21, meshing therewith, and mounted upon the countershaft 10 28, journaled in the bearings 28 attached to the side members 2. The Opposite end of the coun tershaft 28 from the pinion 21 bearslf'a ?ywheel 38 and a pulley 31, whereby the press maybe drivenfas from an electric motor belted to this pulley. Accordingly, when the pulley 3| is thus rotated, the gear- l8 also rotates loosely upon the main drive shaft It. When the foot pedal 28 is ' depressed, the gear 18 drivingly engages the main shaft l8 and ‘causes the crank portion 15 thereof 20 to move in an orbital path. This movement causes the connecting rod l2 to move up and down, car rying with it the platen 8. . tively forward against the load, rather than a mere cushioning device which recedesunder the load. ‘ / The pressure regulating valve 81 is so loaded as to discharge ?uid from line 88 into line 88 during the working stroke, when a predetermined . pressure is reached in the space above the aux 10 iliary pressing ram head 48. On thezupward or return stroke of the press, the check valve .88/per mits this discharged ?uid to be returned from the make-up tank 82 to the lines~88 by way of the vlines 8| and 88' and the pressure regulating valve 15 81. A similar action occurs with the press shown" in Figure 4. ' ~ - As the auxiliary pressing ram 38 moves down wardly relative to the platen 8, it compresses the coil spring 42. When the platen 8 starts on its 20 upward or return stroke, the generator cylinder bores 32 move upwardly relative to the stationary The platen 8 in its lower portion is provided with a pair of generator cylinder bores 32, and an ?uid from the auxiliary pressing cylinder 33. The ' auxiliary pressing cylinder bore 33. These cyl energy stored in the compressed coil spring 42 inder bores are connected at their upper ends then comes into play to retract the auxiliary pressing ram 38 by forcing it upwardly into its by the passages 34. Reciprocably mounted within the cylinder bores‘ 32 are hydraulic generator rams 35, having their lower ends-secured in sock30 ets 36 in the base I (Figure 1). Leakage from the generator cylinders 32 is prevented by the provision of the packings 31, adapted to be com pressed by glands 38. I ' - generator rams 35, thus releasingthe pressure normal position of rest. _ v Press with double-acting pressure generating, rwms and auxiliary pressing rams ' 80 In Figure 4 a double-acting auxiliiary pressing ram 45 is shown as being served by the double Mounted for reciprocation in the auxiliary acting pressure generating rams 48. The latter pressing cylinder bore 33 is the auxiliary pressing have enlarged piston heads 41 upon theirupper ram 38, having an upper'enlargjed portion 48 _ ends,‘ and also have longitudinal bores 85 as in and a lower reduced portion 4|. Surrounding the Figure 1. The pressure generating cylinder bores, reduced portion 4| is a coil spring 42, which is the auxiliary pressing cylinder bore, the packing engaged by the enlarged head 48, thus providing glands, and the remainder of the hydraulic cir for retraction of the auxiliary pressing ram 39, cuit remain the same as in Figure 1,- hence are 40 ' when the platen 8 moves upward. Leakage ‘from > ' designated by the same numerals. The regulation the cylinder bore 33 is prevented by the packing 43, engaged by the gland 44, which surrounds the reduced . portion 41 of the auxiliary pressing ram 39. ‘ v To regulate the pressure developed in the oper ation of the press, as well as to replenish the ?uid required, the generator plungers 35 are pro ’ vided with longitudinal bores 85 which communi 50 cate by the pipe lines 88 with the pressure regu lating valve 81. In the present embodiment (Figure 1) this valve is preferably of the type shown in the copending application of Ernst, Serial No. 669,493, now Patent No. 2,086,295, dated r July 6, 1937. Connected to the opposite side of the pressure regulating valve 8,1 by the line 88 is the check valve 88, which permits ?uid to pass through itself toward the pressure regulating valve 81, but not in the opposite direction, The pipe lines 88 and 81 run from the remaining ports respectively of the pressure regulating valve 81 and check valve 88 to the “make-up" tank 82. ' and replenishment circuit is as in Figure 1. The auxiliary pressing ram 45. (Figure 4) is pro vided with an enlarged head 48 and a reduced stem 48. The cylinder bores 32 and 33 are con 45 nected above the enlarged head 48‘ by the upper passages 58; and below the enlarged head 48 by the lower passages 5|. The latter also are located below the lowermost positions of the in tensl?er piston heads 41. r l I 50' In the operation of the arrangement shown in Figure 4, as the platen 8 descends, the down~ wardly moving cylinder bores 32 cause the" ?uid to be placed under- pressure by their engagement with the fixed pressure generating piston, heads 65 41. .This pressure ?uid is forced through the upper passages 58 into the auxiliary pressing bore 33, causing the auxiliary pressing ram 45 to move downwardly and forwardly against the load, thus positively exerting its force upon the work piece. 60 When the platen 8 has completed its working stroke and starts its return stroke, the intensii The latter contains ?uid under a low pressure, such as under a gravity head or low air pressure, ?er cylinder bores 32 move upwardly relative to and supplies replenishment ?uid to the generator the enlarged head 48 of the auxiliary pressing 65 cylinders 32, in the manner described below. A similar arrangement is used with the press shown the intensi?er piston heads 41. The ?uid above ' In operation, when the foot pedal 26 is de 70 pressed and the platen 8 moves downwardly, ?uid ram 451s thus drawn into the space above the pressure generating piston heads 41. At the same time, the ?uid entrapped below the intensifier piston heads 41 is forced outward through the 70 '75 causing the‘ auxiliary pressing ram 38 to'move regulating valve 81 and the replenishment cir 75 , in Figure 4. ' lower passages 5| into the space beneath the en under pressure by the stationary generator rams ‘,larged head 48 of the auxiliary pressing ramr45. This causes the head 48 to rise, retracting the aux ' 35. _This pressure ?uid moves through the pas ,sages‘ 34 into the-auxiliary pressing cylinder 33, I iliary pressing ram 45. The action‘ of the‘pressure within the generator cylinder bores 32‘ is placed 2,198,152 cult is the same as previously described for Fig 3. member 3, ‘and has a yoke 11 \at‘its lower end with a roller 12 which serves as a cam follower, ure 1. ' ‘It will be‘further understood, from'Figure 6,v engaging the cam 13 ‘mounted upon\the main that the pressing plunger ‘48 of Figure 4 may be drive shaft I6 of the press. The coil s?‘ing 14 5 retracted by means of pressure applied to the ' urges the carnwfollower 12 downwardly against\ . replenishment ?uid in the make-up tank .92, the the cam 13. The 'pilot—operated check valve 95 shown in plunger 46 being provided with the twin longi tudinal bores I23 and in opening ‘respectively Figure 8 may be of any conventional type, the into the space above and beneath the piston head details of which form no part of the‘ present in 10 41. The pressure regulating valve 81 and the vention. The check valve shown for purposes of check valve 89 are similar in construction and illustration consists of a casing I50 having threaded connections I5I and I52 to the pipes operation to those in Figure 4. The ?uid in the 99 and 91, respectively. The casing I50 is pro make-up tank 92 (Figure 6) is subjected, as by vided with a partition I53 with a valve‘ seat I54 compressed air, to pressure high enough to bal engaged by a valve member I55‘, mounted on the 15 15 ance the weight of the hydraulic pressing ram 49. It will be further understood that the auxiliary end of a valve rod I56. The latter passes through pressing ram may be placed in the press bed, as in Figure 5, instead of in the platen. ' Press with two-stage effect from external 'circuit 20 and generator rams The press arranged according to the circuit shown in Figure 7 provides a two-stage effect. To accomplish this, the hydraulic pump 64 pro - vides ?uid to advance the pressing ram 49 rapidly until an intermediate pressure is reached, after which ‘the hydraulic generating plunger 51 im parts such pressure to the ?uid as to ?nish the coil spring I6I of a pressure su?lcient to over come the action of gravity and tending to urge the valve member I55 lightly into engagement with the valve seat I54. Opening into the bore I 59 is a port I62 leading to a longitudinal groove I63,‘which in turn, opens into a chamber I64 formed between the connecting casing I65 and the plug. I66, closing the bore I59 and engaging the end of the coil spring I6I. The casing con nection I65 is threaded, as at I61, to a portion 30 of the casing I50 and has a passageway I68 lead with a high pressure regulating valve 93 and a pilot-actuated pump unloading valve 94 of any ing therefrom into the pipe I03. 3 In the operation of the circuit shown in Fig suitable patterns, the types shown being those disclosed in the copending application of Ernst, _ ure '1, and during the working stroke, the line 60 Serial No. 669,493, .now Patent No. 2,086,295, from the pump 64 delivers ?uid under pressure dated July 6, 1937. Between these is arranged a through the valves 94, Hand 93 and by way of operation at a higher pressure level. 30 a bore I51 in the casing I50, into a valve-lifting ' chamber I58 having a cylinder bore I59. Secured to the opposite end of the rod I56 from the valve member I55 is a piston head-I60, engaged by a , To this end (Figure '1) the circult'is provided ‘the lines 99, 91 and 96 to and throughthe plunger opening plunger operated by ?uid reaching it 51 and the cylinder 53 to the space above the through the line I03 and normally permitting ‘ pressing plungerllil.v The latter is forced down ?uid to go from valve 9.4 to valve 93, but forcibly wardly onto the work piece until?the pressure opened under certain circumstances, hereinafter builds up to such an extent that it backs up in , described, to permit ‘?uid to go in the opposite the pilot line 98 and- operates the pilot plunger direction. This check valve 95 may be of any of the pump unloading valve 94, thenceforth conventional type, the type shown being described causing the line 60 from the pump 64 to dis charge its contents into the discharge lines IM in more detail below.‘ and I02, thence into-the tank 84! The further Y From the bore 59 of the generator piston 51, pilot-operated check valve 95 having a valve the line 96 leads to one side of the high pressure regulating valve93, from the opposite side of which the line '91 leads to the check valve 95 and 50 the pilot line 98 leads to the pilot port of the pump unloading valve 94. From the opposite side of the check valve 95,‘the line 99 leads to a main chamber port of the pump unloading valve 94, to the opposite side of which is connected. the line 60 from the pump 64, ‘From the discharge ports > of the valves 93 and 94 run the discharge lines motion of the press'platen 8' then causes the generating plunger 51 to continue to buildup the pressure of the ?uid and thereby to force the pressing- plunger still further forward. When the 50 pressure of the ?uid exceedsthe load setting of the high pressure regulating valve 93 it actuates the latter. causing it to discharge‘ the ?uid from the line 96 into the discharge line I00 and thence bv the line I02 into the ,tank 84 until the work ing stroke of the platen 8 has been completed. The platen 8 then starts its return stroke, I00 and IM respectively, joining the common dis; charge line I02 which runs back to the supply ,\ whereupon the ?ow from the pump 64 is reversed by the action of the cam' 13. The fluid under 60 tank“. To complete the'circuit, the line 6| from the pressure now passes through the line 6_I, the (30. opposite side of the pump 64 is connected to they . plunger 58 and the cylinder 52 into ‘the space bore 59 of the plunger 56, whence a pilot branch beneath the pressing plunger head 48. retracting I03 continues onward to the pilot port of the the latter. , Meanwhile the same ?uid under pres check valve 95. sure backs up in the pilot line I03 to the check - - .The pipes 60 and 6| lead to the opposite ports 62 and 63, respectively, of thehydraulic pump 64. The latter is of a variable delivery type having a ?ow-control rod. 65, which when moved in or out, varies the quantity and direction of the pressure ?uid passing through the pipes 60 and 6I. The ?ow-control rod 65 is connected by the link 66 to one arm of the bell-crank 61, the other arm thereof being connected by the link 68 to the cam' push rod 69. This rod 69 is reciprocably mounted 75 in the bearings 10, attached to the upper frame valve 95, entering the bore I59 (Figure 8) and urging the piston head I60 outwardly against the urge of the spring I6I, thereby opening the check valve 95 by forcibly lifting the valve member I55 from its seat I54. This allows-the ?uid from the _ space above the pressing plunger head 48 to pass through the plunger 51; the lines 96, '91 and 99;‘ and the valves 93, 95 and 94 to the line 60, thence _ back to the pump 64._ This cycle of operations repeats itself as. theplaten 8 reaches, its, limits 1.5 4 2,128,152 of travel during its subsequent working‘ and re turn strokes. - It will be further'unders'tood that the auxiliary pressing ram 39 might be‘ placed in the bed 8 instead of in the platen 8, the intensi?er rams then being carried by the platen. This arrange ment is shown in Figure 5. @Having thus fully described my invention, what I claim as new and desire to secure by Letters 10 Patent is: " 1. In combination in a press, a movable platen, a piston-and-cylinder assembly including a piston member and a cylinder member for generating ?uid pressure operated by the motion of said. 15 platen, one of said members being associated with said movable platen and the other member being mounted in a substantially stationary position relative thereto, and a second piston-and-cylinder assembly adapted to be operated by the ?uid from 20 said press-operated means, said second piston and-cylinder assembly being arranged to provide additional pressing movement to that of said platen. , 2. In combination in a press, a movable platen, a frame having a bed, means for generating ‘?uid pressure operated by the motion of said platen, and a piston-and-cylinder assembly adapted to be operated, by the ?uid pressure from said plat en-operated means, said piston-and-cylinder as 30 sembly being arranged between said platen and said bed to provide additional pressing movement to the pressing movement of said platen. _3. In combination in a press, a movable ‘platen, a frame, a cylinder bore within said platen, a b3 GI plunger reciprocable within said cylinder bore and secured to said frame, said plunger being» ar ranged to oppose the motion of said platen and to compress the ?uid within said bore, and a 40 hydraulically-actuated device adapted to be op erated by the ?uid pressure generated by reason of the relative motion between said cylinder bore and said plunger. 4. In combination in a press, a movable platen, a frame, a pressure-generating piston-and-cylin der assembly including a,_ piston member and a cylinder member operated by the motion of said - platen, one of said members being associated with said movable platen and the other member being secured to said frame in a substantially station 00 ary position relative to said platen-associated _member and a second piston-and-cylinder assem bly mounted‘ on said platen and adapted'to be operated.relatively to said platen by the ?uid pressure from said platen-operated piston-and‘ in u cylinder assembly by reason of the relative motion between said platen and said frame. 5. In combination in a press, a movable platen, a frame, a presure-generating piston-and-cylin der assembly operated by the motidn of said plat en, the'cylinder of said assembly being associated platen, one of said members being associated with said movable platen and the other member being secured to said frame in a substantially station ary , position relative to said platen-associated member, a second pistonrand-cylinder assembly adapted to be operated by the ?uid pressure from said pressure-generating piston-and-cylinder as sembly by reason of the relative motion between said platen and said frame, said second piston and-cylinder assembly being arranged to provide 10 additional pressing movement to the pressing movement of said platen, an external source of ?uid connected to replenish the ?uid in said as , semblies, and pressure-responsive means adapted to relieve the ?uid pressure in said assemblies 15 when it exceeds a predetermined pressure. . 7. In combination in a press, a’movable platen, a frame, a pressure-generating piston-and-cylin der assembly including a piston member and a cylinder member operated by the motion of said 20 platen, one of said members being associated with said movable» platen and the other member being secured to said frame in a substantially station ary position relative to said platen-associated member, a second piston-and-cylinder assembly 25 adapted to beoperated by the ?uid pressure from said pressure-generating piston-and-cylinder as sembiy by reason of the relative motion between said platen and said-frame, said second ston and-cylinder assembly being arranged to provide 30 additional pressing movement to‘ the pressing movement of said platen, an external source of ?uid connected to replenish the ?uid in said as— semblies, pressure-responsive means connected to said source and adapted to discharge the excessive ?uid pressure from said assemblies into said Cl source when it exceeds a predetermined pressure, and means enabling the ?ow of liquid in one'di rection only between said assemblies and said source.. ' 40 8. In combination in a press, amovable platen, a double-acting pressure-generating piston-and ,cylinder assembly operated by the motion of said platen, and a second double-acting piston-and cylinder assembly adapted to be operated by ?uid 45 pressure from said pressure-generating assembly. 9. In combination in a press, a movable platen, . a double-acting pressure-generating piston-and cylinder assembly operated by the motion of said platen, said assembly including a piston member anda cylinder member, oneof said members be 50 ing associated with said movable platen and the other member being mounted in a substantially stationary position relative thereto, and a second double-acting piston-and-cylinder assembly asso ciated with said movable platen and adapted be operated by ?uid pressure from said pressure generating assembly. 10. In combination in a press, a frame, a mov able platen movably mounted on said frame, a with said movable platen and the piston thereof ' ‘pressure-generating piston-and-cylinder assem 60 being substantially immovably securedto said , bly connected between said platen and said frame . frame and a second piston-and-cylinder assembly _ and adapted to be operated by the motion of said adapted to be operated by the ?uid pressure from platen, a second piston-and-cylinder assembly .- said platen-operated piston-and-cylinder assem bly by reason of the relative motion between said platen andsaid frame, said second piston-and ' cylinder assembly being arranged to provide addi , adapted'to be operated by ?uid pressure from said pressure-generating piston-and-cylinder assem bly by reason of the relative motion between said platen and said frame, and means to retract the 65 tional pressing movement to the pressing'move I piston of said‘ second piston-and-cylinder assem ' bly during the returnstroke of said platen, said 70 ment of said platen. 6. In combination in a press‘, a movable platen, retracting means comprising a source of pneu 70 a frame, a pressure-generating piston-,and-cylin matic pressure operatively connected to said pis der assemblyincluding a‘v piston member and a ton of said second piston-and-cylinder assembly. cylinder member operated by the motion of said HOWARD F. MACMILLIN.