US1608534A - Drawing press - Google Patents

Description

Nov. 3o 1926; 1,608,531`

F; J. RODE DRAWING PRESS Filed Feb. 11, 1924 2 sheets-sheet 1 PRESSURE Sap/ay PRESSURE aP/Dm lNov. 30 1926. 1,608,534

y f F. J. RODE DRAWING PRESS Filed. Ffb-A ll, 1924 2 Sheets-Sheet 2 passt/KE ,SOPPLY Patented Nov. 30, 1925.

UNITED STATES FRIEDRICH J`. IEODE, OF CHICAGO, ILLINOIS, ASSIG-NOR TO MARQUETTE TOOL da MANU- FACTURING CO., OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

*PATENT OFFlCE.

DRAWING- IPRESS.

Application led February 11, 1924. Serial No. 691,911. i

In drawing sheet metal upon a drawing press a certain portion of the power Vof the press is required to form the metal into the shape of the die, but if the blank is to be held so as to prevent it from buckling or wrinkling during the forming operation, then additional power is required forthus holding the blank..

The type of die cushions heretofore vemployed, exerts its pressure upon the blank holder ring and to overcome this pressure of the die and cushion, 'a portion of the power of the press must be employed.

It is one of the ob-jects of the present invention to provide improved blank holding means which will obviate the necessity of utilizing any` portion of the power of the,l

press for actuating the' blank holding means, so that the entire power .of the press may be employed upon the work to shape the latter.

A further object of this invention is to provide in a press of this character improved means whereby vthe parts of the blank holding means may be adjusted to compensate the adjustments of the ram or plunger required for the various kinds of work, that is the depth of the' draw-ofw different jobs and the thickness of the material, as welles any other adjustments necessary for installation purposes.

A further object is to provide an improved structure of this' character including tluid control cushioning means operating upon the draw ring and improved means for retarding the return of the draw ring. 4

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 of 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 view in vertical section of a portion of a draw press'having a cushioning device constructed in accordance with the principles'of this invention attached thereto and showing the parts in one position at lthe start of the drawing operation.

Figure 2 is a view similar to Figure 1, showing the parts'of the press in the same position and with a portion of the cushion adjusted with respect to the plunger or ram.

lment with the rods 18. The

Figure 3 is a view similar to Figure 1 of a f modifiedform of the invention.

Figure 4 is an enlarged detail sectional view taken on line 1- 4, Figure 1.

Referring more particularly to the drawings the numeral 10 designates the bolster or bed plate of a draw press, ram or plunger, 12 a die member carried by the plunger, 13 la forming block mounted upon the bed plate 10, 14 a draw ring encompassing 'the forming block and co-operating with the die member 12 to clamp the material 15, 16 supporting pins for thedraw ring 14, and 17 a pin plate f against `which lthe pins 16 rest the above referred to partsI are of the ordinary and well-known construction in presses of this character.

hangcris. connected with the plunger 11l to depend therefrom and preferably embodother extremities of the bars or rods are provided with screw threads 20.

A supporting member' 21 is connected with the bars 18 preferably through the medium of threaded collars 22 which are journaled in the member 21 and have engaethreads v20 on the respective member 21 is adapted to be adjusted upon the rods 18 toward and away from the plunger 11 by rotating the collars 22 and these collars fmay be rotated in any suitable manner such as by means of an endless chain 23 which passes over toothed wheels (not shown) connected with the collars 22. f

Disposed between the pin supporting plate 17 and the supporting member 21 is a Huid pressure cushioning device embodying a cylinder 24 which is supported by and secured to the member 21 in any desired or suitable rmanner such as by means of fastening deable packing 30 may be provided to form a fluid tightl joint.

Discharging into the bottom of the cylinder onone side 0f the piston 26 isa pipe 11 a.reciprocating to be supported thereby. All of 31 which is connected with. any suitable lsource of iiuid pressure supply.

. The cylinder is provided with an open'- ing 32 in the wall thereof between the closed end 29and the other si-del of the piston 26, and connected with this opening 32 is a pipe 33, which 'leads to a suitable source of iiuid pressure supply-as at 34;

Interposed between the pipes 33 and 34 is a valve casing35, having an opening 36 to which the pipe 33 is connected and an openine 37 t-o` which the pipe 34 is connected.A T casing is alsov provided with an opening' 38 leading-'to the atmosphere. Within the casing 35 is a rotary valve 39 having an opening 40, and which opening is of such a configuration that the valve 39 may -be ro tated to connect the pipe 33 with either the .opening 37 or 38 in the casing 35, to direct fluid pressure into'the'cylinder between the piston 26 andthe end 29 or to permit the escape of the fluid pressure from such portion of the cylinder through'the openingl 38 to the atmosphere. 'i

` Connected with the valve 39 is a handle or 'lever 41 adapted to be engaged by lingers or tappets" 42-43, adjustably connected With the rod 44, aecordingto thedirection of movement of the rod.

30 The rod .44 is connected .with any suitable movable 'portion of the press so that at va predetermined time 'in the cycle of operation of the press the valve '39 will be automatically shifted; or rotated. -In the .operation of-the device the parts the power of the. press lso that the entire 10U will assume the position as shown in Figure 1'just atthe commencement of theformlng ofthe article. As the plunger 11 is lowered the draw ring 14 will lbe depressed with respect to the forming block 13 and the mate- Tlal 15 will be'formed-over the latter.- During .the descent of the draw ring 14 the pin i ,plate 17 will `be lowered andwith it the pifs,

ton 26, the cylinder y24 being held stationary. or in a fixed osition with' respectv to the plunger .1.1. T e operation of the piston in the cylinder 24 will be against the Huid pressure in the bottom ofthe 'cylinder -and during vthis `lowering movementrof the piston the valve 39 will be in the position shown in Figure 1 to permit/outside air to be drawn into the cylinder abovethe piston. t i

After the" article has been shaped tle plunger will begin to recede or ascend and at this time in the operation of the apparatus the valve 39 may be shifted so as to connect the pipe 34 with the pipe 33 to permit fluid pressureto be admitted linto the-cylinder 24 on the other side of the piston 26.

vIt will be noted that 'by reason ofthe piston I rod 27, 'the area on the upperside ofthe piston 26 is reduced or .smaller than the area of the piston on the lower side. 'By reason of this construction there will be a-shghtly greater fluid pressure against the pistonon the lowerside than on the upper side and in for the purpose of a` clear understanding of this invention, does not constitute a portion of the subject matter of the present application but forms the subject matter of a copending application, Serial Number 691,653.l

The blank holding means may be adjusted j to compensate the adjustments of the rain, orL

plunger required for various kinds of work, that is the depth of draw of different jobs and the varying sizes of the different dies, and vthis is accomplished by' adjusting the collars 24 upon the rods 1 8V'to-move the .sup-l port'2l toward or away frdlii the plunger 11 and when s o adjusted will'remain in a fixed'.

position with respect tothe plunger..

Commercial sheets of metal from which the articles are formed upon this press, vary in thickness to such an I.extent that it is frequently necessary to measure and assort the sheets.

By! the use .of the present invention the cushioning device will cause'the blank holding means to automatically adjust itself to compensate the varying thickness the ma.

terial.

Vith this construction it will also be manifest that the strain of the cushioning device' and blank gripping means is separate from power of the press may be utilized in the formation of the article andno portion thereof will be employed for use in connection with the blank holding or gripping means.

. In the form of the invention shown in Figures 3 andv 4, supplemental means are provided for assisting in sustaining the.-

weight of certain portions of the mechanism such as the draw ring` 14, pins 16, pin plate 17, pistonrod 27 and piston 2 6.

This supplemental means is also prefer ably of a fluid pressure cushion construction, f

any number of which cushions may be employed.` Each of these cushioning devices consists essentially of a cylinder 45 having a' piston 46 therein. The'` piston may be adjustably connected with a'tubular piston rod 47 and the piston and rod are anchored'tol the bed. or holster plate'. 10, through the mediuln of .a bolt 48, which passes through the tubular memberf47, and has secured .to the free end thereof a nut or collar 49. A washer -50 may be interposed between the nut or col,-

nlar and the end ofthe tubular member 37.

The-piston 46 may b e threaded as at 51 upon thetubular member 47 so as to relative adjustment thereof 'and discharging through the piston 46 is a pipe 52 and which pipe 52 is connected with anysuitabls'ouce of fluid pressure supply.

'lo l the Huid pressure acts, while described here- -sure maybe'led from the The cylinder is preferably open at its bottom and the closed end 53 ofthe cylinder is engaged by the pin plate 17 and upon "which cylinder the plate rests, the plate 17 bolug provided with openings 54 through which the tubular 'member 47 loosely passes.

Any number of these supplemental cushinning devices may be provided andthe pipe 52 leading therefrom may be connected with the ,coupling 55 so .that the fluid pres.- `source of supply and be distributed to the various cylinders 45 lin use, the 'supplemental cushioning device is employed for sustaining the weight of the parts and after the formation of the' article or at any desired point in theffcycle of operation of the machine, Huid pressure may be admitted into or released from the cylinder-45 between the piston 46 and vthe closed end 43 of the cylinder and this fluid pressure may .be of any desired degreel in relation to the fluid pressure in the blank holding cushioning device; s While the preferred forms of the invention have been lherein 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's'cope of the claims, without departing from the spiritof 'this invention.

WVhat is claimed as new iszl. A drawing press including a plunger, blank holding means -co-operating with the plunger toJ grip the work, a iiuid pressure cushion for the said blank holding means, said cushionfincluding co-operating parts movable relatively one with respect to the other, means connecting one of the cushion parts with the 'blank holder, means securing the other part of the cushion tothe said plunger formovement therewith andl in a iixed position with respect thereto, and means for varying at will the fixed position of the plunger and the cushion part which is secured thereto.

Y 2. A drawing press including a plunger,Y

a blank holder co-operating with the plunger for clamping thedfwork, hangers depending trom the plunger, a support, means connecting the support with the hangers -for movement with the. plunger in a fixed posi.l 'tion with relation ,theretoI and 'for adjustment withrespect to the plunger, and a fluid (pressure cushion including'a piston andl cylin er relatively movable one with respect to the other, the cylinder and piston being connected `one with the said support and the other with vthe said blank holdingmeans.l

3. A drawing press'including a plunger,

a blank holder co-opera'tingz; with the plunger for clamping th. work, hangers depending from the plunger, a support, means'connecting thesupport with the hangers for moveor clamping.

er for clampingthe work, hangers depend- U ing from the plunger, a support, means connecting the support with the hangers for movement with the plunger in a fixed posi-l tion with relation thereto and for adjustpressure cushion including a piston and cylinder relatively movable one with respect to the other, thecylinder and piston being connected one with the the other with the said blank holding` means, means for supplying fluid pressure yto one side of the cushion, and means for supplyinglat will, fluid pressure tothe other side of the said cushion.

blank holder co-operating with the plunger the work, hangers depending from the plunger, a support, means connecting the support with the hangers for movement with the plunger in a fixed position with relation thereto and for ad]ust ment with respect to the'plunger, a fluid pressurecushion including a pistonV and'cylinder relatively movable one with respect to the other, the cylinder and piston being con- .said supportv and.,

`. ment with yrespect to the plunger, a lluid 5. A drawing press including a plunger, a I

nected one with the said support and the other withy the said blank holding means,

means for supplying fluid pressure to one*L sidey ofy the cushion, and means operating automatically to supply pressure 'to-the other side of the cushion.

6. A drawing press including a plunger,

a blank holder co-operating with the plunger for clamping the work, hangers depending from the plunger, a support, means connecting the support with the hangers for movement with `the plunger in a xed i- Ation with relation thereto and for ad]ust mentr with respect to Jthe plunger, a fluid pressure cushion including a piston and inder relatively movable onewith respect t'o the other, the cylinder and piston being connected one with the vsaid support and the other "with the said blankholding means,

lmeans for supplying luid pressure to one side of the cushion,- and means including valve mechanismh for directing pressure to the other side of the .cushion to operate in opposition to the liid pressure on the lirst' recited side of lthe cushion.

'Z'.v A drawing press including a plunger, l'

a blank holder co-operating with the plunger for clamping the work, hangers Adepending from the plunger, support, ymeans connecting ythe support with the hangers for A movementI with-the plunger in a xed posi-vl tion with relation thereto and for adjustment with respect to the plunger, -a fluid.

pressure cushion including a piston andy cylinder relatively-movable one with respect to the other, the cylinder and piston being connected one with the said support and the l0 other with the said blank holding'means,

andadditional means for sustaining -the from the plunger, a support, means con- .lnecting the support with the hangers or movement with the plunger in a ixed position with relation thereto and for adjustment with respect to the'A plunger, a fluid pressure cushion .including a piston and cylinder relatively movable one with respect l to the other, the cylinder and piston'being connected one with .the said support and the other with the said blank holding means,

andadditional fluid pressuremeans for sustaining -tlie weight of certain ofthe said parts. t 1 9. A drawing press 'including a plunger, a

3,0.bla'nk'holder co-operating with the plunger for clamping the work, a lfluid pressure cushion for the blank holder, said .cushion including relatively movable parts, and

means adjustably securing one of the parts of the cushion to the plunger for movement therewith and in a iixed position with relation thereto, the said blank holding means operating to compensate the varying thick- -esses in the material being operated upon and while a uniform pressure 1s bemg maintained upon the said blank .holding means. v'

10. In a power press, the combination with a sheet metal forming die, fluid pressure means for holding the blank, said means in-v cluding a piston and cylinder-members, one of the said members being adjustably connected With a movable part of the press, and means whereby the position of the piston Within the cylinder, one with relation to the other, will remain constant during the forming of the material.A 11. In a power press, 'the combination with a sheet/.metal forming die, fluid pressure mea-ns for holding the blank, said means including apiston and cylinder members, one of the said members being adjustably connected with a movablev part of the press, and means vwhereby the -pressure upon the,

material will' remain constant during the 60 forming operation. p Y In' testimony whereof I have signed my name to this specification. on this 5th da of February, A. D. 1924.

FREDRICH J. Ropa.r

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