US1544573A

US1544573A - Blank-holding means

Info

Publication number: US1544573A
Application number: US639810A
Authority: US
Inventors: Rudolph W Glasner; Fredrich J Rode
Original assignee: Marquette Tool & Manufacturing Co
Current assignee: Marquette Tool & Manufacturing Co
Priority date: 1923-05-18
Filing date: 1923-05-18
Publication date: 1925-07-07
Anticipated expiration: 1942-07-07

Description

July '7, 1925. 1,544,573

R. w. GLASNER-ET AL BLANK HOLDING MEANS Filed May 18, 1923 4 Sheets-Sheet July 7*, 1925.

' 1,544,573 w. GLASNER ET AL BLANK HOLDING MEANS Filed May 18. 1923 4 sn eets-sneet 2 nmgakzfllaszzer Weak)" z J/iada' {iii July 7, 1925. 1,544,573

R. w.* GLASNER ET AL,

' BLANK HOLDING MEANS Filed May 18, .1923 4 She'e ts-Sheet 4 I 47 A h 3 J- 1 I ,1 J I 62 I I Patented July 7,1925.

UNITED STATES "PATENT OFFICE.

RUDOLPH W. GLASNEB,

. C v OFCHICAGO, ILLINOIS, AND FRIEDRICH J. RODE, 0F CLEVE- LAND, OHIO, ASSIGINI'OBS TO HARQUETTE TOOL & MANUFACTURING CO., .01 CHI- CAGO, ILLINOIS, A CORPORATION OF ILLINOIS. 1

BLANK-HOLDING MEANS.

Application filed Kay 18, 1923. Serial No."639,810.

To all whom it may concern:

Be it known that we, RUDOLPH; W. Gus-- KER, residing at Chicago, in the county of Cook and State of Illinois, and FREDRICH J. Roms, residing at Cleveland, in the county of Cuyahoga and State of Ohio, both citizens of the United States, have invented certain new and useful Improvements in Blank- Holuing Means, of which the following is a specification. I The present invention relates in general to metal stamping presses of the type known as double acting presses, but more particularly the invention relates to the blank holding means therefor.

Heretofore in presses of this kind it was necessary, and in fact only possible to set what 1s known as the blank holder for a fixed extent of travel with respect to the work supporting surface and after it was once set, the extent of distance of travel would not change during e operation of the press and furthermore it would always have a. tendencyto travel the same distance under all conditions, often resulting in serious damage if anything-should attempt to reduce the extent of such travel during the operation of the press.

To overcome these difiiculties and objections and to provide improved means where by the blank holder'wouldbe subjected to a given pressure rather than to be set for a predetermined length oftravel, is one of the objects of the present invention.

In practice it is found that metal sheets 7 vary greatly in thickness and also that the sheets being operated upon vary in thickness while they are being drawn into shape. It is therefore another object of'the present invention to provide an improved blank holder which, while exerting a certain pressure upon the blank, will still be flexible enough to allow for such variations of thickness of the metal which take place during such operation.

It is further an advantage to provide means whereby the pressure-exerted u n the blank maybe changed during the di erent stages of the drawmg operation during one cycle of operation of the press.

llerctot'ore in drawing presses of this kind the amount of pressure exerted upon the upon the extent of travel of the blank-holder, and which travel was always fixed or constant. Under these conditions it will be manifest that it was necessary to adjust the mechanism so as to vary the extent of movement of the blank holder for the varying thicknesses of the work. In the event that the blank holder was adjusted for a predetermined thickness of metal and a sheet of material of a. greater thickness was fed through the machine, it will be manifest that consider-.

able damage would be caused either to the work or the machine or both, and in case a thinner sheet'was fed through the machine, the work would wrinkle. v

Furthermore, as the thickness; of the ma.- terial during the shaping or forming operation varies owing to the flow of material I from one part of the material being operatthe metal at a desired pressure for a given,

length of time and serious difficulties have been experienced by the heretofore short dwell, which was not controllable but was fixed with relation to the position, lengths and shapes of the toggles or cams and their movements.

It is one of the objects of the present invention to provide improved means whereby the pressure upon the work to be drawn into blank by the blank holder merely depended shape may be predetermined and. at the same time will be flexible.

Another ob ect 15 to provlde improvedblank holding means which will readily lend itself to the formation of various shapes out of sheet metal of varying thicknesses and at the same time exert a predetermined pres-' 'sure upon such varylng thicknesses of the sheets.-

Another object is to provide improved blank holding means which will exert a, desired pressure upon the blank and compensate for such variations in thickness of the metal to be drawn as are taking place in the metal during the drawing operation.

Another object is to provide an improved blank holder which will provide a clearly place during the operation of forming.

Another object is to provide an improved blank holder by means of the use of which the amount of pressure upon the blank may be variable at will. 4

Another object is to provide an improved blank holder in which the amount of pressure may be varied at will during the forming operation and during the cycle of opera-2 tion of the press.

Another object is to provide an improved blank holder by means of the use of'which various pressures maybe exerted upon the blank during one cycleof operation, such pressure varlation being produced automatically and at predetermined periods during such cycle of operation.

Another object is to provide an improved blank holder and means for releasing the pressure upon the blank during a predetermined stage of the forming operation.

Another object of the present invention is to provide an improved blank holding means moving independently of the forming block and means for allowing for variations of pressure by said blank holder upon the metal sheet to be formed.

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 partly in elevation, partly in section and with arts omitted of a press having a blank hol in means constructed in accordance with the principles of this invention applied thereto.

Figure 2 is an enlarged detail view partly in elevation, partly in section and partly broken away of, a link motion for operating one of the die members.

Figure 3 is an end elevation of. Figure 2.

Figure 4 is a view of a portion of a press having a-modified form of blank holding means applied thereto.

Figure 5 is a diagrammatic View of the cushioning device and the controlling mechanism therefor.

Referring more particularly to the drawings the numeral 10 designates the bed of a.

press supporting the die

member

11, 12 indi-' cates a ram carrying a punch member 13 and reciprocable by means of links 14. The press is also provided with a reciprocating blank holdingmember 15, to which ablank holder 16 is connected. All of these parts are of the ordinary and well known construction in double acting presses. I

The blank holding member 15 is reciprocable by means of a crank arm 16, between which crank arm and the blank holding member links are arranged so that as the crank arm 16 is rotated the links will cause the blank holding member to be reciprocated.

In machines of this type any number of links may be provided but four are preferably used and in the present invention as the construction and operation of each of the links is the same, the description of one will apply equally as well to them all.

The link is of a sectional

construction embodying members

17 and 18, which are pivotally connected intermediate the ends of the member 18 as at 19. One end of the of such relative movement, such for in- V stance asa fluid pressure cushion designated generally by the reference numeral 22. This cushion may be secured to the link in any suitable manner such'as by means of anchor rods 23 and the cushion member includes any desired number of chambers which are out of communication with each other.

In the form of the invention shown in Figures 1 and 2, the cushion includes two chambers 24-25 separated by a partition or head 26. Within the chamber 25 is arranged a piston 27 and within the chamber 24 is arranged a piston 28. These pistons are connected by means of a piston rod 29. which asses through the partition 26 and a suitable packing 01- stufling box 30 may be provided for forming a fluid tight joint. The free end of the piston rod 29 is connected with the end 31 of the section 18 of the link preferably bvmeans of a supplemental link32 pivotally connected as at with the link section 18 and is also pivotally connected as at 34 with the end of the piston rod 29, so that when the pistons are moved within the cylinder or cushion 22 the sections 17-18 of the link will be rocked with the section 18 will also be rocked about its .pivot 20, while the section 17 will be rocked .25 on one side of the piston 27 and'another.

pipe 39 has communication with the chamber 25 on the side of the piston 27 opposite to the side on which the pipe .37 communicates with the chamber 25. 7

It will thus be seen .that'when fluid pressure is admitted into the pi s 35-37 the. pistons 28-26 will be move into the position shown in Figure 2 of the drawings and the fluid pressure will then hold the

link sections

17 and 18 in a position} to maintain the blank holding member 15 in a position that the blank holder 16 carried by the blank holding member 15. will travelto the full extent or limit of its movement by the links. Obviously the pressure of the fluid under these conditions may be such that the blank holder 16 may be permitted to yield forany desired extent when the blank holder engages the work, but the pressure will be such that the blank holder will be moved into engagement and will exert a working pressureupon the blank.

This construction is advantageous inasmuch as it will permit the blank holder 16 to yield in the event that work of varying thicknesses are placed into the machine after the blank holder has been once set. Furthermore the blank holder 16 will yield in the event that during the drawing operation the work 40 or portions thereof increase in thickness due to the flow of the material from one portion thereof to the other. This yielding of the blank holder 16 will prevent damage to the work as well as to the parts of the mechanism:

' It will be obvious that if the blank holder 16 is set for a predetermined extent of movement by the links for a blank of a predetermined gauge or thickness and a blank of a larger gauge or thickness is fed into the machine, considerable damage will be caused if the blank holder 16 is not permitted ,to yield to compensate the varying th'icknesses of the work.

If on the other hand. the extent of movement of the blank holder 16 is adjustedso as to accommodate work of one thickness and a blank of a smaller size or gauge is. fed into the machine, the blank will not be held with sufficient firmness to prevent the same from wrinkling or becoming distorted and torn during the forming operation.

Therefore, by providing a means wherebly the blank holder 16 may automatically a just itself to compensate the varying thicknesses of the work,these objections will be obviated.

The pressure in the cylinder may be controlled automatically in a manner to be hereinafter set forth.

If desired and under certain conditions when necessar ,-or desirable, the pressure in one or more 0 the cylinders may be reduced at predetermined times in the cycle of oper. .ation of the machine. This may be accomplis'hed b the cylin ers on one side of the piston or by exerting another fluid pressure on the other side of the pistons, which is eater than the pressure already exerted t ereon,

so as to move the pistons in the opposite direction and thereby permit the

links

17 and 18 to be relatively moved with respect to each other.

This may be accomplished by admitting fluid pressure on the opposite side of the piston 27 through'the pipe 39.

Fluid pressure may be supplied from any suitable source such as from a main supply pipe or line 41 leading from which are a plurality of branch pipes or lines 42-43- 44, through a suitable controlling device designated generally by the reference numeral 45. This controlling device is provided with suitable valves 46-47 for controlling the direction of flow and the pressure of the fluid and'the valves are adapted to be operated from any suitable source either from a moving portion of the machine or from a separate motor (not shown), and which motor imparts motion to a sprocket gear 48, the latter being connected by means of a sprocket chain 49, which passes over an-- other sprocket 50 for operating the valves 46-47, it being understood that a separate operating mechanism is preferable for each of the valves 46-47.

The specific construction and operation of this controlling or valve operating mechanism, however, forms no'part'of the present invention but constitutes the subject matter of aseparate application.

either releasing the pressure in" The pipe 42 is connected with the controlling device 45 on one side of the valve 46,- and leading from the other side of the valve 46 is a pipe 51, which has communication with the pipe 37 leading to the cylinder 25 on one side of the piston 27. The pipe 44 has communication with the pipe 35, the latter having communication with the chamber 24 on one side of the piston 28. The pipe 43 has communication with the valve 47 on one side thereof and leading from the other side of the valve 47 is a pipe'52 which has communication with the pipe 39, the latter communicating with the chamber 25 on the opposite side of the piston 27.

Suitable pressure regulating valves 53-- 54 -55 may be arranged resfiectively within the pipe lines 424344. y the provision of these pressure regulating valvesthe fluid pressure on the respective sides of the respective pistons may be predetermined.

It will-therefore be manifest that during 'the cycle of operation of the press, the

valves

46 and 47 will be automatically operated at predetermined points or times in such cycle.

trolled and the desired pressure may also be,

controlled, thereby rendering it possible to vary the pressure at difl'erent stages in the cycle of operation of the press, and thereb rendering it possible to produce in a sing e operation of the press shapes and forms of devices which, in order to produce with I presses as heretofore constructed and without the use of the present blank holding means, would necessitate several difl'erent and distinct operations, necessitatin the possible use of two or more di erent presses. v

- Furthermore by the use of this invention it is possible with cams or toggle actin presses to hold the material .being operated upon at a desired pressure for a predetermined length of time to produce a perfect or clearly defined dwell of the blank holder against the material.

In the form of the invention shown in Figure 4, the link between the crank 16' and A the blank holding member 15 embodies a member 56 which is pivotally connected as at 57 with the blank holdingmember 15 and has connected therewith a cylinder 58, which is provided with a partition 59 dividing the cylinder into two chambers 60-61.

The other member of the link 62 is pivotally connected as at 63 with the crank 16 and extends into the cylinders and through the partition 59. Connected with the member 62 is a piston 64, which is movable within the chamber 61 and a second piston 65 is also connected with the" member 62 and is including blank holding aneans, mechanical means for moving the blank holding means movable within the chamber 60. a y

A pipe 65'- has communication with a passage 66 in the head of the cylinder and has communication with .the chamber 60 and corresponds with the pipe 35 in the form of the invention shown in Figure 2. A pipe 67 has communication with a passage 68 leading through the partition 59 and has communication with the chamber 61 on one side of the piston 64 and corresponds with the pipe 37 in the form of the invention shown in Figure 2.

A pipe 69 has communication with a pashas communication wi sage 70 in the head of t cylinder and also the chamber 61 on the other side of the piston 64 and corresponds with the pipe 39 in the form of the invention shown 1n Figure 2.

\Vhile the preferred forms oi the invenl tion have 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, and it is to be further understood that although there is shown and described in each form of the invention, two cylinders embodying the cushionin device, this number may be increased or ecreased according to the nature of the press and the workto be performed thereon. For these reasons, it isdesired that the drawings submitted herewith, shall be considered as being merely diagrammatic of the invention.

What is claimed as new is l. Blanklholding means, motion creating means, and actuatin mechanism for the blank holding means interposed between the latter and the said motion creating means, the said actuating mechanism including a fluid controlled yieldable portion.

2. A machine of the character described including blank holding means, mechanical means for moving the blank holding means into engagement witli and forcausing the same to exert a working pressure upon the work, the said moving means including a yieldablefluid pressure cushioning device exerting its stress upon the blank holding means, and means for varying the stress of the cushioning device upon the blank holding means.

3. Amachine of the character described includingblank holding means, mechanical means for moving the blank holding means into engagement with and for causingthe sameto exert a working pressure upon the work, the said moving means including ieldable fluid pressure mechanism operatmg to permit the blank holding means to yield with respect to the said moving means to compensate the varying thicknesses of the work. v .1 4. A machine of the character described into engagement with and for causing the same to exert a working pressure upon the work, and fluid pressure yielding means whereby the stress of the said blank holding means upon the work and with respect to the said moving means may be varied at will. F

5. A machine of the character described into engagement with and for causing the same to exert a working pressure upon the work, and fluid 'pressure'yielding means whereby the stress of the said blank holding means upon the work and with respect to the said moving means may be automatically varied to compensate the varying thicknesses of the work.

6. A machine of the character described including blank holding means, and mechanical means for moving the blank hold ing means into engagement with and for causing the same to exert a workin pressure .upon the work, the said mecl ianical means including as a component part thereof a fluid pressure yielding yieldable section.

7. A machinb of the character described including blank holding means", mechanical means formoving the blank holding means into engagement with and for causing the same to exert a working pressure upon the work, the said mechanica means including as a component part thereof a yieldable section, and fluid pressure means for controlling the stress of the said yieldable section.

8. A machine of the character described including blank holding means, mechanicalmeans for moving the blank holding means into engagement with and for causing the same to exert a working pressure upon the work, the said mechanical means including as a component part thereof a yieldable section, and fluid pressure means for controlling the stress of the said yieldable section. a

9. A machine of the character described including blank holding means, mechanical means for moving the blank holding means into engagement with and forv causing the same to exert a working pressure upon the work, the said mechanical means including as a component part thereof a yieldable section, fluid pressure means for controllin the stress of the said yieldable section, an means for controlling the said fluid pressure means.

10. A machine of the character described including blank holdin means, mechanical means for moving the lank holding means into engagement with and for causing the same to exert a working pressure upon the work, the said mechanical means including I work, the said mechanica as a component part thereof a yieldable sec-' as a component part thereof a yieldable section, and fluid pressure means operating automaticall to control the stress of the said yieldabl e section.

' 11. A machine of the character. described including blank holrlin means, mechanical means for moving the lank holding means into-engagement with and for causing the same to exert a working pressure upon the means including pressure means for controlling the tion,flui

the said yieldable section, and

stress of and means operating automatically to control the said fluid pressure means.

12. A machine of the character described including blank holding means, mechanical means for moving the'blank holding means into engagement with and for-causing the a same to exert a working pressure upon the work, the said mechanical means including,

same to exerta working pressure upon the work, the said mechanical means including as a com onent part thereof a yieldable sectlon, uid pressure means for controlling the stress of the said yieldable section, all

of the recited parts being disposed above the work.

14. A machine of the character described including blank holding means, mechanical means for moving the blank holding means into engagement with and for causing the same to exert a working pressure upon the work, the said mechanical means including as a component part thereof a yieldable section, and means for controlling the stress of the said yieldable section, all of the recited parts being disposed above the work.

- 15. 'A. machine of the character described including blank holdin means, mechanical means for moving the lank holding means into engagement with and for causing the same to exert a working pressure upon the work the said mechanical means including a link connected with the blank holding means, said link being sectional, said sections being relatively movable, and fluid pressure yielding means for controlling the relative movement of the link sections.

16. A machinejof'the character described including blank holdin means, mechanical means for moving the lank holding means into engagement with and for causing the same to exert a working ressure upon the .work, the said mechanica means including a link connected with the blank holdingmeans,- said link being sectional, said sections being relativel movable, fluid pressure yielding means or controlling the relative movement of the link sectlons, and

means for varying the stress of the said I yielding means.

17. A machine of the including blank holding means, mechanical means for moving the blank olding meansinto engagement with and f r causing the same to exert a working pressure upon the character described I work, the said mechanical means including a link connected with the blank holding means, said link being sectional, said sections being relatively movable, fluld pressure yielding means for controlling the relative movement of the link sections, and means for automatically controlling the stress of the said yieldingmeans. A

18. A machine of the character described including blank holding means, mechanical means for moving the blank holding means nto engagement with and for causing the work, the said mechanical means including a link connected with the blank holding means, said link being sectional, said sections being relatively movable, fluid pressure means for controlling the relative move-' ment of the link sections, and means for controlling the said fluid pressure means.

20. A machine of the character described including blank holding means, mechanical means for moving the blank holding means into engagement with and for causing the same to exert a working pressure upon the work, the said mechanical means including a link connected with the blank holding means said link being sectional, .said sections being relativel sure means for controlling the relative movement of the link sections, and means controllable at will and operable in opposition to the said fluid pressure means for reducing the stress of the blank holding means upon the work.

21. A machine of the character described including blank holding means, mechanical means for moving the blank holding means into engagement with and for causing the same to exert a working pressure upon the work, the said mechanical means including a link connected with the blank holding means, said link beihg sectional, said sections being relatively movable, fluid pressure means for controlling the relative movement of the link sections and fluid pressure means controllable at will and o erable in opposition to the first recited flui pressure for reducing the stress of the blank holding means upon the work.

22. A machine of the character described including blank holding means, mechanical means for moving the blank holding means into engagement with and for causing the movable, fluid pressame to exert a working pressure upon the work, the said blank holding means being movable to a predetermined extent by the second recited means, and means operating to permit the blank holding means to yield with respect to the second recited means and while the stress of the latter is exerted upon the blank holding means. v

23. A machine of the character described including blank holding means, mechanical means for moving theblank holding means into engagement with and for causing the same to exert a working pressure upon the work, the said blank holding means being movable to a predetermined extent by the second recited means, and fluid pressure means operating to ermit the blank holding means to yield wit respect to the second recited means and while the stress of the latter is exerted upon the blank holding means. a

24. A machine of the character described including blank holding means, mechanical means for movingv the blank holding means into engagement with and for causing the same to exert a working ressure upon the work, the said blank hol ing means being "movable to a predetermined extent by the second recited means, fluid pressure means operating to permit the blank holding means to yield with respect to the second recited means and while the stress of the latter is exerted upon the blank holding means, and

means for controlling the pressure of the said fluid pressure means.

25. A machine of the character described including blank holdin means for moving the lank holding means into engagement with and .for causing the same to exert a working pressure upon the work, the second said means operating to move the blank holding'means a predetermined distance upon each cycle of-o'peration of the second recited means, and fluid pressure means whereb the extent of movement of the blank holdmg means by the second recited means may be varied while the ex:

means remains constant. p

26. A machine of the character described including blankholding means, mechanical work, the second said means operating to move the blank holding means a predetermined distance upon each cycle of operation of the second recited means, and fluid pressure means whereby the pressure of the blank holding be varied while the extent of movement of the second recited meansremains constant.

27. A machine of the character described including blank holding means, mechanical means for moving the blank holding means means, mechanical tent of movement of the second recited means upon the work may into engagement with and for causing the same to exert a working pressure upon the work, the said mechanical means including i a link connected with the blank holding including blank holding means, mechanical means for moving the blank holding means into engagement with and for causing the same to exert a. working pressure upon the 15 work, the said mechanical means including a link connected with the blank holding means,' fluid pressure means connected with the link and operating to permit the blank holding means to yield with respect to the Work While the stress of the link is exerted upon the blank holding means, and means controllable at will and operable in opposition to the said fluid pressure for reducing the stress of the blank holding means upon the work.

In testimony whereof We have signed our names to this specification, on this 7th day of May, A. D. 1923.

RUDOLPH W. GLASNER. FREDRICH J .RODE.