US1625991A - Blank-holding means - Google Patents

Description

' 1,625,991 R. w. GLAsNl-:R ET mT BLANK HOLDING MEANS April 26 1h47.

Filed Oct. 21. 1922 3 Sheets-Sheet l @A @l 1 e1 l 10 1,625,991 April 26" 1927 R. w. GLAsNl-:R ET AL BLANK HOLDING MEANS Filed O'ct. 2l. 1922 3 Sheets-Sheet 2 April 26, 1927.

R. w. GLAS-NER ET Al.

BLANK HOLDING MEANS Filed 051-. 21, 1922 Patented Apr. 26, 1927. y

UNITED STATES PATENT OFFICE.

RUDOLPH W. GLA'SNER AND OLOI` G. NILSON, OF CHICAGO, ILLINOIS, ASSIGNORS TO MARQUETTE TOOL 8c MANUFACTURING COMPANYfOF CHICAGO, ILLINOIS, A COR- PORATION OF ILLINOIS.

BLANK-HOLDIN G MEANS.

Application filed October 21, 1922Av Serial No. 595,985.

This invention relates to improvements in.

form the same, but also must work in op-1 position to the pressure of the blank lholding means, with the result that among other things more power is required to'operate the press.

In order to overcomethese objections and to increase the capacity of the press without increasing; its size or power necessary for its operation, and to provide `improved means whereby the blank holding means and the ram or movable member of the press may operate independently of each other so that it is not necessary for the ram or movable member lto operate in opposition to the 'stress of the blank holding means, is one of the objects of the present invention.

A further object is to provide an improved blank holding means embodying ,pressure creatingA means for actuating the blank holder and means whereby the said pressure will at a predetermined point in the operation of the machine also operate upon the movable` part of the'press for assisting the said movable part 1n its operan A further Objectis to provide an improved device of this character which will be simple,durable, cheap and compact in construction, and effective and eicient in operation, and which'may beI readily applied to sheet metal presses and which may as readily ybe detached therefrom Without altering the construction or interfering with the original purpose for 'which ,the machine ywas designed.

rangement of the several parts'hereinafter moe fully described. and Claimed and. shown in the accompanying drawings illustrating this invention and in which` Figure 1 is a view partly in elevation and partly in section of a portion of a sheet metal press, having a blank holding means applied there-to and constructed in ac'- cordance with the principles of this invention. '1

Figure 2 is a diagrammatic view showmg .the method of applying a plurality of cu'hions to a press;

a modified form of the invention.

Referring more particularly to the-drawing the numeral 10 designates a` stationary portion of a mechanically operated sheet metal press, 11 is the lower blank holder, and l2 a movable .part or the ram of the press carrying the die punch ,13, all of the ordinary and well known construction.

The ram 12 is adapted for a reciprocating movement toward and away fromthe die member 11. p

The numeral 14 designates a blank holder` ring and 15 a'blank holder which 3o-operateA inder 17, telescopingfwith a 'cylinder 18 1s the operationA of the*v 'Provided for controlling blank'holder 15, 1.

Any number of these fluid pressure vcush ionsvmay be employedI and as the construction and operationoffeach cushion fis the] same, the description [of one will'apply,

equally as well to them all.

The cushion is supported in any desiredf or suitable Vmanner froma1s`t'aticnary`por-- tion lof the press 'anda simple and etiicient means and as shown' -`1n`tl1e present invention, embodiesa rod or projection 1'9 which," l

is connected with the' cylinder=18to project?" therebeyond and this rod is'anchored "orf se# cured to the fixed member `10 of the press kin any suitable manner preferably by insert-"jA ing one end'20 of the rod into-the *member 10 and. securing ythe aame'by'meansofja'suite'` able fastening screw or bolt 21.

Carried by the 'rod 19 isa piston 22 which-v operates in the cylinder 17 and there is pro- 18is a piston member 24 which is preferably connected and forms the end of the cylinder 17, and through which piston 24 the piston rod 25 is adapted to slide, there being provided a suitable stuffing boX 26, to form a fluid tight joint between the two.

If desired, there may be provided an outlet passage 27 leading from the inside of the cylinder 17 between the pistons 22 and 24 and which passage 27 discharges to the atmosphere.

Connected with the cylinder 17, preferably to the end 28 thereo is a depending rod 29, which passes loose y through a portion of the ram 12. This rod 29 may be of any desired length and is connected in any desired or suitable manner with the draw ring 14, such as by means of a fastenin screw or bolt 30, so that when the cylin er 17 moves with relation to the cylinder 18, the draw ring 14 and the blank holder 15 will move independently with respect to the movement of the ram 12.

Fluid pressure is supplied to the cylinder 17 from any suitable source and in any suitable manner preferably by means of an inlet pipe 31, which discharges into the cylinder 17 and receives its supply through a pipe or connection 32, which latter in turn leads from the source of su ly.

A suitable valve 33 1s provided for controlling communication between the pipes 32 and'31 and-this valve is preferably arranged within a casing 34, having a discharge outlet 35, leading to the atmosphere.

The valve 33 is provided with a passage- Way l36, so arranged that when the valve is in the position shown in Figure 1, communication will be established between the pipe 32 and the pipe 31 for the purpose of delivering Huid pressure into the cylinder 17. The valve 33, however,'"may be adjusted so as to close communication between the pipe 32 and establish communication between the pipe 31 and lthe pipe 35, so that the fluid from the cylinder 17I may be discharged through the pipe 35 andled to any suitable point. 1

'With this construction it will be manifest that when fluid pressure is admitted into the cylinder 17, the fluid will also flow through the opening 23 and into the cylinder 18 to establish the same relative pressure l in the two cylinders.

In order to release or relieve the pressure or stress of the draw ring 14 and blank holder 15 upon the work or blank 16, itis .only .necessary to relieve the pressure in the vcylinders 17-18. which may be accomplished in any suitable manner and in the present invention a. simple and eiiicient means for accomplishing this result is shown as embodying the valve 33, which may be adjusted so as to establish communication between the pipes 31 and 35.

The valve 33 may be operated in any desire-d or suitable manner such as b means of a handle 36, with which is connected a suitable operating rod 37, adapted to be actuated in any desired manner.

AIf desired, a suitable regulating valve indicated diagrammatically at 38, may be provided in the pipe line 32, and which pipe line leads from any suitable source of pressure supply to the cylinders 17 and 18.

It is thought that the operation of vthis invention will be clearlyunderstood from the foregoing, but briey stated it is as follows. When the press is not operating the ram 12 will be elevated and the cylinder 17 will be telescoped within the cylinder 18.

Assuming that fluid pressure is admitted to the cylinders 17--18 and the ram starts to descend, the fluid pressure in the cylinders 17 and 18 together with the weight of the draw ring-14 and blank holder 15 will cause the latter to descend with the ram, the rods 29 being of such a length that the draw ring 14 and blank holder 15 will be in a position that the blank holder 15 will engage the work 16 ahead of the punch 13 so that the fluid pressure in the cushions will operate upon the ram 12 to assist in lowering the ram, and at the same time the fluid pressure in the cylinders will operate upon the blank holder 15 to cause the latter to grip the work 16.

I'nasmuch as the blank holder 15 engages the work before the punch 13 engages the work it will be manifest that the stress of the cushion operates directly upon the blank holder 15 so that from the time that the blank holder 15 engages the work the pressure of the cushion will be directly upon the blank holder and the ram will be relieved of such pressure. In other words as soon as the blank holder 15 enga es the work the movement of theblank ho der will be arrested but the ram will continue to move independently of Athe blank holder `and no power is necessary from the ram to hold the work, the work being held entirely by the pressure exerted upon the blank holder by the stress of the blank holding means.

After the forming operation, the ram first starts to ascend for a predetermined portion of its travel and at a further predetermined llU point in the operation of themachine the pressure within the cylinders 17 and 18 is re lieved and the blank holder will ascend with the ram. i

Obviously the pressure inthe cylinders 17-18 may be regulated bythe pressure regsible to control the pressure or stress lof the blank holdingmeans at any point in the operation ofthe machine.

vIt will be manifest that any vnumber of these pressure creating means may be provided for operating upon the blank holder according to the work to be performed and in the diagrammatic illustration Shown'in Figure 2, means are provided for employing four sets of cylinders, but it is obvious, as before .stated` any number of cylinders may be employed.

ln the diagrammatic illustration shown in Figure 2, one of the valves 33 is provided for each cushion element and these valves are adapted to be independently operated so as to control the pressure in each element independently of the other and if desired, regulating valves 38 may also be provided in the pipe line connections and which regulating valves are individual to the cushion elements so that a di'erent degree of -fluid pressure may, if desired, be exerted in the individual cushiony elements.-

lf the fluid pressure blank holding means embodies only .one cushion element or if it is desired to simu`ltaneously control a plurality of these -cushion elements a single controlling valve 39 may be provided in the pipe line connection, and which valve 39 may be of a similar construction to the valve 33, one portion of the valve controlling the fluid inlet pipe 40, leading to the cushion elements and corresponding with the pipe connection 32, and the said valve is also provided withfa discharge outlet 41, corresponding with the outlet 35 and communicating with the atmosphere. Y

Thus it will be seen that by setting the valve 39 so as to establish communication between the source of fluid supply andthe pipe lines 42, which correspond with the pipe line 32,the fluid pressure in all of the cushions may be simultaneously controlled, provided, however, that the valves 33 are first opened for a simultaneous control.

When it is desired for an individual control then the valves 33 of the respective cushion elements are operated as desired.

A regulating valve 43 may also be provided in the pipe connection 40 and corresponds with the regulating valve 38, shown in Figure 1.

ln Figure 3 of the drawings, there 'is shown another adaptation of the blank holding means and in this form of the invention the cylinder 44 is anchored to the ram or movableX part 12 of the press and leading` through Athe bottom of the cylinder is an outlet 45, which communicates with the atmosphere. A

The cylinder 46 which telescopes with the -cylinder 44 is supported in any' suitable manner from a stationary part of the ma.-

chine such as the partlO by means of a depending rod 47, which -passes through the' head 48 of the cylinder' 46, and also. passes through a suitable opening in the head 49 of the cylinder 44, and which latter head forms a piston. Suitable packing 5() is arrange-d within the opening in the head 49 through which the portion 51 of the rod 47 reciprocates.

n opening 52 is provided throughthe portion 51 of the rod 47, which has cormnnnication as at 53 with the cylinder' 44 and also has. communication as at 54 with the pipe connection 55. The passage 52 communicates with the cylinder 46 by means of a suitable opening 56 and a suitable controlling vvalve 57 has connection with the pipe 55 The valve 57 may be operated in any suitable manner such as by means of a handle 58 to which handle may be connected an operating rod 59, and which rod may beconnected, if desired, with any movable part of the machine.

Leading from the valve 57 is a pipe connection 60, which connects with any suitable source of pressure supply and if desired there may be arranged in the pipe connection a suitable regulating valve 61. 'With this form of the invention the operation briefly stated is as follows. Assuming the ram 12 to be elevated the blank holder :i

the ram to assist in its descending opera- 1 tion.

As soon as the blank holder 15 engages the work 16, the movement of the blank holder will be arrested and the blank holder will be held in a gripping position upon the work 16 by means of the fluid pressure exerted in the cylinder 44. The blank holder engages the work in advance of the die `punch 13, and the pressure Will be even in the cylinders 44 and 46. When the'blank holder is arrested the ram 12 continues in itsv downward movement b press operating means and just at the time that the blank holder is arrested the pressure in the cylinders 44 and 46 will continue to operate upon the ram 12 to assist in forcing the ram downwardly.

' When the blank holder 15 is in engagement with the work' 16 and is arrested 1n its downwardmovement, .the piston 62 in the cylinder 44, and which piston is connected with the rod 19, will be arrested in its movement and the bottom of the cylinder 44 will move away from the piston.A Inasmuch as lun lJU

the portion 51 of the rod 47 is stationary and projects into the cylinder 46 and also into the cylinder 44, the end of the portion 51 will telescope into'the opening 63 in the rod 19.

It will therefore be manifest with this improved invention the fluid pressure is first exerted upon the blank holdingl means and when the blank holding means has been arrested in its movement and is gripping the work, the ram still operating under the influence of the pressure in the cushioning'device will also descend and be arrested in its. operation of forming the material.

During the relative movement of thepiston 62 and cylinder 44, it will be manifest that atmospheric air will be iirst drawn into the cylinder 44 beneath the piston 62, and then discharged therefrom through the opening 45.

NIt will be manifest from the foregoing that by reason of power beingadded to the ram during its downward movement, when the work is to be performed, by the stress of the blank holding means upon the machine, the capacity of the press will be greatlyincreased without making it necessary to increase the power for the operation of the press.

While the preferred form of the invention has been herein shown and described it is to be understood that various changes may be made in the details of construction and in the combination and arrangement of the several parts, within the scope of the claims,

without departing from the spirit of this invention. 1

By the term mechanically operated as used in the claims it is to be understood to mean a press which is operated in the ordinary and well known manner by means of the usual rotary crank. I

While there has been shown and described a simple and efficient means for accomplishing the results desired it is to be understood that the drawings herewith submitted4 are only illustrative of the principle' and therefore, it is desired that the drawings herewith submitted shall .be considered as being merely diagrammatic.

What is claimed as new is:

vl. A mechanically operated draw press embodying aforming block, a movable element co-operatin'g with the forming block, and yielding blank holding means movable with and with respect to the said element, whereby said movable element will be operable upon the work and will .be relieved of the stress of the said blank holding means, the said blank holding means embodying a plurality of yieldable cushion elements, the

said cushion elements being disposed above, the work. v -v 2. A mechanically operated draw press embodying a forming block, a movable element co-operating with the forming block, and yielding blank holding means movable with and with respect to said element, whereby said movable element will be' operable upon the Work and will be relieved of the stress of the said blank holding means. the said blank holding means embodying a plurality of fluid pressure cushion elements, the said fluid pressure cushion being dis# posed above the work.

A draw press embodying a forming block, a movable element co-operating with the .forming block, yielding blank holding means, said movable element being operable upon the work in such a manner that it will be relieved of the stress of the said blank holding means, the said blank holding means embodying a plurality of fluid pressure cushion elements, and means for controlling the said fluid pressure.

4. A draw press embodying a forming block, a movable element co-operating with the forming block, yielding blank holding means, said movable element being operable upon the work in such a manner that it will be relieved of the stress of the said blank holding means, the said blank holding means embodying a plurality of fluid pressure cushion elements, land means individual to the said lements for independently controlling the said pressure.k l

5.' A draw press embodying a forming block, a movable element co-operating with i the forming block, yielding blank holding means, said movable element being operable upon the Work in such a manner that it will be relieved of the stress of the said blank holding means, the said blank holding means embodying a plurality of fluid pressure cushion elements, and means common to the said elements for simultaneously controlling the said pressure.

6. A draw press including a forming block,'a movable element co-operating withthe`forming block, yielding blank holding means, said movable element being operable upon the work in such a manner that it will be relieved of the stress of the said blank holding means, the said blank holding means embodying a uid pressure element, and means for controlling the said fluid pressure.

7. A draw press including a formin block, a movable element (zo-'operating witii the forming block, yielding blank holding means, said movable element being operable upon the Work in such a manner that it will be relieved of the stress of the said blank holdin means, the said blank' holding means em dying a fluid pressure cushion element,` and means for controlling the said4 fluid rassure, the said Huid pressure cushion being disposed above the work.

Y 8. In combination. a sheet metal forming die, said die including malek and female `N0 forming members and blank `holdingmembers, one of the members of the die being actuated by a mechanical power means, and a iluid pressure cushion actuating the other member of the die.

l9. In combination, a sheet metal formimg die, said die including male and female' forming membersand blank holding 'members, one of the members of the die being actuated by a mechanical power means, and a fluid pressure cushion actuating the other member of the die, the said cushion being mounted above the work.

l0. In combination, a sheet metal forming die, said die including male and female forming' members and blank holding members, one of the members of the die being actuated by a mechanical power means, and a fluid pressure cushion actuating the other member of the die, the said cushion operbeing actuated by a mechanical power means, and a fluid pressure cushion actuatin the. other member .of the dle, the said said die including a male and fe-f 25 cu hion being mounted above the work and Y operating to relieve the power driven memf to thebers of the die of stress in addition driving stress thereof.

In testimony whereof we have signed our names to this specification, on this 19th vday of October, A. D. 1922.

RUDOLPHy W. GLASNER. OLOF G. NILSON.

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