US1562953A - Blank holder - Google Patents

Description

BLANK HOLDER Filed Feb' 18, 1922 e sheets-shea 1 V@la i Nov. 24, 1925 R. W. GLASNER ET AL BLANK HOLDER Filed Feb. 18, 1922 6 Sheets-Sheet 2 R. W. GLASNER ET'AL BLANK HOLDER Filed Feb. 18. 1922'v 6 Sheets-Sheet 3 mw mw 0.

Nov. 24 1925., 1,562,953

R. W. GLASNER ET AL BLANK HOLDER Filed Feb, 18. 1922 '6 Sheets-Sheet 4 ff Mr/@zy Nov. 24, 1925`- R. w. GLASNER ET Al.

BLANK HOLDER 6 Sheets-Sheet 5 Filed Feb' 18. 1922 *Ein/@mwa IIIIII H H w mw W W FWHM@ n lillumini 6 647%.

R. W. GLASNER ET AL.'

Nov. 24 1925.

BLANK HOLDER Filed Feb. 18, 1922 '6 Sheets-Sheet 6 Patented Nov.. 24, 19.25.

UNITED STATES PATENT OFFICE.

RUDOLPH W. GLASNER AND OLOF ce NILsoN, OF CHICAGO, ILLINOIS, AssIGNoRs 'ro MARQUETTE TOOL @L MANUFACTUMNG COMPANY, or CHICAGO, ILLINOIS, A COR- PORATION OF ILLINOIS.

BLANK Application lcd. February To all whom 'it may concern.'

lle it known that we, RUDOLPH W. GLAS- Nnn and OLor G. NILsoN, citizens of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Blank Holders, of which the following is a specification.

This invention relates to improvements in blank holders particularly adapted, though not necessarily limited in its use with sheet metal presses.

One of the objects of the invention is to provide improved means whereby a Single acting press may be readily converted into a double acting` press.

A further object is to provide improved means whereby a double acting' press may be readily converted. into a triple actingD n'ess. l To the attainment of these ends and the accomplishment of other new and useful objects as will appear, the invention consists in the features of novelty in substantially the construction, combination and arrangement ot the several parts hereinafter more fully described and claimed and shown in the accompanying drawings illustrating' this invention and in which Figure 1 is a front elevation of a portion of;- a single acting press'having this improved blanh holder applied thereto the shaping member being omitted.

Figure. 2 is a vertical sectional view as taken on line 2-2, Figure 1.

Figure 3 is a detail view as taken on line 8MS. Figure 1.

Figure 4 is a vertical sectional view ot' a portion of a double acting` press having a blank holder constructed in accordance with the principles of this invention, applied thereto.

Figure 5. is a view taken on vline 5-5, Figure 4.

Figure 6 is a view in elevation of a portion of Figure.

Figure 7 is a view partly in vertical section and partly in elevation showing' anotherl lorm of the invention.

Figure 8 is a detail sectional view on line Sufi. Figure 7.'

Referring more particularly to the drawings and in the forni of the invention shown" -in Figures 1 to 3, the numerall() designates HOLDER.

18, 1922. Serial N0. 537,392.

a stationary portion of a single acting press and 11 designates a reciprocating ram or plunger of the ordinary and well known construction, and which plunger is adapted to be reciprocated in the usual manner.

rIhe ram 11 is provided with the usual flange 12 and upon this flange are mounted a plurality of pairs of superposed cylinders 13-14- Any number of these cylinders may be employed on both sides of the center of the ram, one set being thus disposed on each side.' As the construction and operation ot each of the cylinders of each set is the same the description ot one will apply equally as well to them all.

Arranged within the cylinder 13 is a piston 15 and within the cylinder 14 is a piston 16, each ot the pistons being provided with any suitable packing arranged about their peripheries to form fluid tight joints between the pistons and the cylinder walls. The pistons 15 and 16 are connected by a hollow piston rod 17, which passes through the head ot the cylinder 13 and is open at its top to form communication with the interior of the cylinder 14. The piston rod is also provided with any suitable number of openings 18 adjacent the upper face ot the piston 15, so that the cylinders 13 -14 will have communication with each other b v means of the hollow piston 17.

The piston 17 is provided with a depending portion 19 which extends through the. lower head of the lowermost cylinder 13 and also through a suitable opening in the flange 12. 'll`o the end of these dependingV portions 19 a-blank holder ring' 20 is connected in any suitable manner such as b v means ot fasteningA devices 21. Any suitable means may be provided for limiting the movement of the blank holder ring 2() withrespect to the ram 11 in one direction such as bolts 22, which are secured by one extremity to the blank holder ring', and which pass through suitable openings 23 in the flange 12, to proj ect, therebeyond and the projecting end 24 of the bolts are threaded and adapted to receive suitable Jfastening nuts 25.

Leading from the cylinder 13, beneath the piston 15, is an outlet 26 which 'has communication with the atmosphere and through which opening any Huid which may be present beneath the piston l5 will be discharged when the piston is moving towards the lower head of the cylinder 13.

`Leading from the cylinder 14, beneath the piston 16 is an outlet 27, with which outlet is connected a pipe 28, which in turn is connected with a pipe 29 having connecltion with a valve casing 30, the valve casing being provided with an outlet 31 having communication with the atmosphere. Within the valve casing 30 is a valve 32 having passages 33 and 34 therein.

Leading into the top of the cylinder 14, preferably through the upper head thereof isa pipe 35, which has communication by means ofa connection 36 with an outlet 37 of the valve casing 30. The valve casing 30 is provided with another opening 38, with v which a pipe 39 has communication and this pipe 39 has communication with a pipe 40, which passes through a suitable stalling box -1-1and telescopes with a pipe 42, which latter has communication with a supply pipe 43. The pipe 42 is 'anchored upon the por- 4tion 10 of the machine by means ot' a suitable anchoring device or yoke 44, so that the pipe will remain stationary while the ram 11 is being reciprocated, and during such reciprocation the pipe 40, which telescopes with the pipe 42 will be reciprocated with respect thereto and will always maintain a con'nnunication between the pipe 39 and the supply pipe 43.

The valve 32 is adapted to be positionedl so that the pipes 36 and 39 will be brought r into communication while the pipe 29 will be brought into communication with the outlet 31, leading to the atmosphere. In this position of the valve the 'luidenters the pipe 43 and iows through the telescoping pipes 472-40 into the pipe 39 through the valve casing 30 and passages 34 of the valve to the pipe 36, from where it will be delivered` through the pipe 35 intothe cylinder' 14 above the piston 16. A portion otl the lluid will 'low through the hollow piston rod 1T to be discharged through the outlets 13 into the cylinder 13 above the piston y15. This will cause the piston 16 to descend with respect to the cylinders and thereby lower the blank holder ring. Anyfluid in the cylinder 13 below the piston 15 will be discharged to the atmosphere through the opening 26, while any fluid in the cylinder 14 beneath the piston 16 will be discharged through the opening 27, pipes 284-29, passage 33 in the valve '32,`\to the atmosphere through the outlet 31 of the casing 30.

The Huid is admitted into the cylinders above the pistons before the ram 11 starts to descend so that the full pressure will be exerted upon the tops of the pistons 15 and 16. As soon as the blank holder, which is carried'by the blank holder ring 20 contacts with the work the motion of the blank holder and blank holder ring will be arrested while movement. `of the blank holder and blank holder ring the ram continues in its further downward This arresting of the movement which pressure is exerted upon the blank` holder, which is in engagement with the work.

After the operation of forming of the article has been completed the blank holder may be allowed to remain in contact with the work until the ram has reached a redetermined point in its cycle of o'eration. At this time, the blank holderl rlng then starts to recede and this receding operation of the blank holder` may be accomplished at any desired time.

If desired, however, the valve 32 maybe operated at any point in the cycle of opera tion of the ram 11 so as to cause pressure to be exerted upon the bottom of the piston 16 in the cylinder 14 to raise the blank holder ring and the blank holder away from the work so as to permit of the ready removal of the shaped article. By thus adjusting or causing the blank holder ring or blank holder' to move away from the work in this manner it will'be manifest that it is possible to draw a shell of a depth to substantially the full stroke of a single action press, by reason of the fact that the blank holder or blank holder ring will be withdrawn sufficiently to permit the removal ot' the finished article. l

Any suitable means may be provided for actuating the valve 32. This may be accomplished either by hand or automatically. It it is desired to accomplish the same auton'latically there may be provided a lever 45, which is connected with the valve 32 and connected with the lever 45 is a link or rod 46, which may in turn be connected with any suitable part oi the machine. As the valve 32 is adusted so as to permit the pistons 15 and 1G to be raised in the cylinders byfluid }.iressure the valve will be positioned so that the port or passage 33 will form communication between the pipes 39 and 29, thereby directing the fluid pressure through the pipe 39 to the bottom of the piston 16; At the same time the passage 34 will be positioned to establish communication between the pipe 36 and the outlet 31, so that thelluid in the cylinders 13-14, above the pistons 1516, will be discharged through the pipe 35, pipe 36, passage 34 and through the discharge outlet 31 in the valve easing 30 to the atmosphere.

In the form of the invention illustrated in 4Figures 4 to 6, the principles of this invention are shown as being applied to a double acting press, in which 47 designates the blank holder and 48 the punch which carlength of the stroke.

ciprocable member preferably embodies a bottom and side portion.l The'top of the fixed member and the bottom of the recipro cable member overlap each other and their edges respectively abut the inner faces of the sides of the other member so as to form a space or chamber 52 therebetween, suitable packing 53--54 being provided to form" fluid tight joints. The,reciprocatingV members 51 are adapted ito be superposed and are secured together in any suitable manner such as by means of fastening` bolts 55, arranged adjacent the inner periphery of the members. The fixed members 50 are also superposed and are adapted to be secured together in any desired or suitable manner preferably by means of fastening devices or bolts 5G, extending through suitable ears 57, and the cushion thus formed -is adapted to be secured to the blank holder 47 in any suitable manner preferably by means of fastening bolts 58, passing through suitable openings in a flange L59 and entering suitable threaded openings GO in the uppermost member 50.

The draw ring 61 is secured to the lowermost reciprocable member 51 in any desired or suitable manner but preferably by means of clamps G2, preferably of an l. shaped formation, one edgel of which abuts the lower face of the member 51 and the other edge overlaps a flange on the draw ring (l1.Y The lowermost member 5l is provided with a groove 63, extending through its lower face into which groove the head G4 of a bolt G5 is adapted to be seated. This bolt passes through the clamp 62 and receives on its free end a lut (Stir It Will therefore be seen that when the blank holder cage 47 is reciprocated the draw ring 61 Will also be reciprocated and when the draw ring forces the blank against a die 63 the movement of the draw ring 61 will be arrested but the blank holder cage 47 will continue to descend for the full The draw ring 61 is controlled by the fluid pressure so that the draw ring will be caused to exert a substantially uniform pressure upon the blank duringthe forming operation. To that end fluid is supplied to the chambers 52 in any suitable manner preferably through the medium of a pipe 67, provided with branches G8, one leading to each of the chambers to interfere with the reciprocating movement of the blank holder cage 47.

The ldie, in the form of the invention illustrated in Figure 4, embodies a movable portion G9, which latter'is preferably s`upported by means of pins passing through the bolster plate 71 of the press and the pins 70 may be supported by means of a suitable cushion 72, common in machines of this character.

In operation, the blank to be formed is placed upon the die 63 and as the blank holder cage 47 and punch 48 descend, the draw ring 61 will contat with the blank and co-operate with the portion 63 of the die for holding the blank in position. At the time the blank holder descends the pressure of the fluid in the chambers 52 Will be exerted upon the movable portions 5l of the cushion but when the draw ring 61 is arrested by its engagement With the work, the reciprocable members 51 will be caused to more with relation to the fixed members 50, so as to gzip the blank between the draw ring and the die 63.' As the blank holder cage 47 reaches the limit of its downward movement the -punch 48 continues in its descending moveof a greater latitude of movement of-the the thickness of the ring 7 3, so that when the ring 73 is raised by means of the duid being directed beneath the piston 16 into the cylinder 14, through the opening 27. the ring 73 Will be moved in close proximity to the face of the bottom of the ram and the portion 74 of the ram will project into the opening in the ring as shown in dotted lines in Figure 7. M

ln this form of the invention the bottom draw ring 7 'is supported by means ofthe pins 70 and the upper face of the ring 75 is vpreferably adapted so that it. will normally stand slightly above the die block 76, which latter is secured upon the bolster plate 71'in the usual manner.

In operation and during the downward movement of the ram.11 the ring 73 will be in the position shown in Figure 7, as it approaches the ring 75 to engage and clamp the work, the Work being supported by the ring 75 and extending across the die block 76. A further movement of the ram in a downward direction will cause the ring 73 to co-operate with the ring 75 to grip the blank. The ring 73 is held in the position shown in Figure 7, by reason of the pressure in the cylinders 14 above the piston 16, and this pressure is suficiently strong to cause the ring 73 to shape the blank over the die 76.. During this shaping operation and as theram 11 descends, the ring 75 will also descend against the pressure of the cushions 72 untilthe completion of the forming operation.

When the ram 11 begins to recede, the ring 75 will follow the ring 73 and the shell which has been shaped over the die block 76 will be stripped orvremoved from the die block as the ring 75 ascends. lV hen the ringI 75 reaches the limit of its upward movement the shaped article will be supported by the ring 75 until the valve 3() has been operated to permit the fluid in the cylinders 14 to bc discharged from the cylinders 14, through the pipes 35-36, 29-28, to the bottom side of the plunger 16. plunger 16 to: rise with respect to the ram 11, and with it the draw ring 73 until the draw ring 73 has assumed the position shown in dotted lines in Figure 7. In this `position of the parts, when the ram is elevated, the shaped article may be removed.

With this invention it will be manifest that a press of this character may be readily adapted to and effectively and eliciently draw or shape articles of a depth to substantially the full stroke of the ram.

Any suitable means may be provided for shifting the valve 30, but a simple and eilicient means embodies a tubular member 77, which is pivotally connected at one end as at 78 with the lever 45, connected with the valve. Telescopi-ng with this member 77 is a rod 7 8,` which is pivotally connected asat 79, with a fixed portion of the press such as the portion 10.

Adjustably mounted upon the rod 78 is a collar 80 which is adapted, when the ram 11 rises to engage, at a predeterminedpoint in the operation of the press, the end of the member 77 and thereby shift the valve 30 in one direction.

The rod 78 is provided with a slot or 'groove 81 having ashoulder 82 and a pin or member 83 projects into the groove or slot 81 and is'in turn connected with a collar 84, adjustably mounted upon the member 7 7 This collar 84 with the pin 83 is adapted to be so positioned upon the member 77 that when the ram 11 reaches a predetermined point in rlhis will cause thev its cycle of operation, the pin 83 is engaged by the shoulder 82, to shift the lever 45 and position the valve in the casing 30 so as to establish communication.between the pipe 36 and the atmosphere through the opening 31, and also establish communication between the pipe 39 and the pipe' 29 so as to permit the fluid above the piston in the cylinder 14 to be discharged to the atmosphere and to direct the incoming fluid to the bottom of the piston 16 to move the ring 13 into the position shown in dotted lines in Figure 7.

With this improved invention it will also be manifest that the mechanism will automatically adjust itself to compensatefor the varying -thicknesses of the sheets or blanks to be drawn or shaped and at the same time a substantially unvarying pressure will be exerted upon the blank throughout the forming operation.

Furthermore it will be manifest that with this invention it is not necessary to set the upper blank holder accurately as the upper blank holder may be set at approximately the proper position, after which the blank holder will automatically adjust itself according to the thickness of the blank being operated upon.

lt will also be manifest that by the provision of a -luid pressure means operating upon the blank holder of al double acting press, the press will be converted into a triple acting press.

It is sometimes desired or necessary in constructing or shaping certain forms, such as irregular forms to exert a different gripping pressure upon different parts of the blank being shaped and in order to accom# plisli this result it is necessary to maintain different pressures in different cylinders 14 or groups of cylinders, and this may be accomplished in any suitable manner such as by means of a controlling valve` designated generally by the reference numeral 85 in Figure 1, and this valve is arranged in the pipe connection 35 between the cylinder and the valve casing 30.

While in Figure 1, a controlling valve 85 is shown as being applied to only one of the cylinders 14, it is to be understood that a similar valve may be vemployed in connection with eachof the cylinders 14 or any desired number or groups of said cylinders.

This valve 85 preferably embodies a casing provided with a wall 86having an opening 87 which is controlled by a valve 88, the,

latter being influenced by diaphragm 89. Acting upon the diphragm 89 is a spring 90, the tension of which may be varied by means of an adjusting screw 91.

A pressure gauge `92 may be provided and the valve casing is provided with an outlet 93, which is connected with the pipe 35 leading to the cylinder '14. Connected also. with the pipg-35 is afbranch pipe 94, which IUS lil)

has communication with a valve casing 95, the latter having an outlet opening 96, discharging into the atmosphere. Within the casing 95 is a valve, 97, controlled by a spring 9S and the tension of the spring may be adjusted by means of a suitable adjusting screw 99.

The tension of the spring 98 tends normally to hold the valve 97 seated so as t0 cut oit communication between the pipe and the outlet 96 while the spring 90 is so arranged that it tends norm-ally to hold the Valve 88 unseated.

In use the fluid under pressure entering the pipe 35 will flow through theopening 87 to be discharged through the opening 93 and into the cylinder 14.

Fluid-will continue to flow in this direction and thepressure will beexerted in the cylinder 14 until a predetermined pressure is obtained in the cylinder and this initial predetermined pressure is controlled by the adjustment of the screw 91 to vary the tension of the spring 90,' and which spring 9() operates upon the diaphragm 89 in opposition to the fluid thereupon. When the pressure has reached a predetermined degree the diaphragm 89 will be deflected, overcoming the tension of the spring 90 and will close the valve 8S to-shut ofi any further supply of fluid to the cylinder 14, at the same time maintaining the pressure in the cylinder 14.

IVhen the piston 16 (s eeFigure 2) de scends the fluid pressure in the cylinder 14 l* may be controlledat will by the control of the valves 8S and 97, the tension of ythe sprlug 98 being maintained atthe pressure which it is desired to open the valve 97. This construction permits of the obtaining of any desired pressure in any one oranore of the cylinders 14 or groups of cylinders and the pressure in these cylinders may be controlled at will. I

While the preferred forms of the invenlion have been herein shown and described, it is to be understood that various changes maybe made in the details of constructionv and in the combination and arrangement of the several parts, within the scope of theclaims, without depart-ing from'the spirit of this invention.` IVhat is claimed as new is 1. A mechanically operated sheet metal drawing press embodying a reciprocating member, au'd means whereby the member reciprocation and operable upon the top side of the work, and means for controllingthe fluid pressureupon the blank holding means.

means embodying valve mechanism for conf trolling the fluid pressure upon theblank holding means by controlling the direction of flow of the fluid. p v

3. A. mechanically operated sheet metal drawing press embodying av reciprocating 'member-, fluid pressure blank holding means mounted upon the said member and operable upon the top of the work, the said means embodying a plurality of cushions, and means whereby the pressure of the cushions may be varied with respect to each other.

4. In a 'mechanically operatedsheet metal drawing press a reciprocating member,

`fluid pressure blank holding means mounted Cil upon the said member and voperable upon the top of the work, the said means embodying a plurality of' cushions, and means whereby the relative pressures of the cushions may be varied at will.

5. In a mechanically operated sheet metal.

drawing press a reciprocating member, fluid pressure blank holding means mounted upon the said member and operable upon the top ce A of the woi'lgtlie said means embodying a plurality of cushions and means whereby different pressure may be maintained in dif- Y, f

'ferent cushions.

6. In a sheet metal drawing press a form-` ing die, a reciprocating die co-operating therewith, a plurality of blank holding mea-ns, means adapting said blank holdingv means for'operation in opposition to each other, and cushioning means individual to the said'blank holding means.

7. In a sheet metal drawing press, a forming die, a reciprocating die co-operating therewith, .a plurality of fluid pressure blank holding means, means adapting said blank holding means for operation inopposition to each other, and means whereby the pressure of said blank holding means may be varied at will with respect to each other.

In testimony whereof-we have signed ournames to this specification on this 15th day of February, A. D. 1922.

RUDOLPH W. GLASNER. OLOF G. NILSON. l.

Images