US2331059A

US2331059A - Blanking die set

Info

Publication number: US2331059A
Application number: US383697A
Authority: US
Inventors: Charles H Tauser
Original assignee: Bell Aircraft Corp
Current assignee: Bell Aircraft Corp
Priority date: 1941-03-17
Filing date: 1941-03-17
Publication date: 1943-10-05
Anticipated expiration: 1960-10-05

Description

Oct. 5, 1943. c. H. TAUSE'R BLANKING DIE SET Filed March 1'7, 1941 2 Sheets-Sheet 1 Fig.1.

I 6 10 *1 151 42016 2 1 81) ms ,Yl

ATT RNEYS Oct. 5, 1943. c. H. TAUSER 2,331,059

I BLANKING DIE SET Filed March 17, 1941 2 Sheets-Sheet 2 I Ill/II INVENTOR I Chcgmswiausen ATTORNEYS- Patented Oct. 5, 1943 I w Application Mmhn, 1941, Serial Nassaem I 7 Claims. (cries-19 The present invention relates to dies for-blanking out fiat sheet metal pieces and has particular relation to template dies for this purpose.

In many manufacturing processes, such as in the manufacture of airplanes, :it is desired 'to blank out sheet metal parts with template dies which may be formed inexpensively fromsheet metal. The template dies are used-in conjunction with conventional die sets comprising a heavy metal die shoe anda punch'holder which serve as backings for the template dies during the punching operations.

One such die set may be adaptedto accommodate template dies of various sizesandshapes, and since'such die set must backsmall as well as large templates, it is not feasible to'p'rovide the die shoe which supports the female template with an opening for discharging the blanked outma terial. Accordingly, other means must be provided for permitting such material to be removed from the die set after each punching operation.

The present invention contemplates animproved arrangement and combination of parts whereby male and female template diesare supported by the punch holderand die shoe, respectively, in such manner'that during operation of the press these partsneed not be disassembled'or' otherwise moved by the press operator, in order to efiect removal of the blanked each punching operation;

The male template 'die, and pressure pad surrounding "the die, may be secured out pieces after to a foundation plate, forming'a die unit which: may be detachably connectedto a punchholder for being carried by the latter during operation of the press, the detachable connection-being of anature thatvany one of a number or'such die units maybe used-with the punch holder.

According to the invention the tem ale tem-i plate die may be supported upon spring backed guide pins carried by the die shoe,-the pins'nor mally supporting the female die in spaced relation-above the shoe but permitting. it to be pressed against the shoe when the -'die set-"is closed.-

Spacevis provided between the guide pins to allow;

the blanked out pieces to-be removed from the die set through the; space between the female template die when the latter is -raised,,the actual removal being effected by anair blast, or by grav byother ity in the case .01 an inclinable press, or suitable instrumentality;

These and. other, objects and advantages will,

become apparent from the following. description.

otthe typical embodiments of the invention.

shown in the accompanying drawings, wherein:

also a resilient Fig. 1 is a verticalsectionthrough 'a die set;

Fig. 2 is a vertical section through-adie set of modifledform;and,

-Fig. 3 is a fragmentary sectional vicwtaken along line 3-3of Fig. 2.2 v I The die set shown in Fig. 1. comprises a die shoe ladapted to besecureclto the bed of 'apunch press in the usual manner, and .a punch l'lolder Z guided for vertical movement: relative to the shoe by guide -pins 3secured tothe shoe," the punch'holder being adapted for connection to the press stem bywhichit israised and lowered during punching operations. f

The punch holder supports and backs -a male die unit comprising afoundation' plate 4 which may be alight sheet of metal and a male template die 5 which": may beof: sheetzmetal, preferably somewhat heavier tha'n'the metal sheets to be punched. 'The. template 5 may be inexpensively formed from a sheetrof steel into the shape tof the pieces which are to be punched, being harda ened by suitable treatment eitherbefore or: after formation, and thereaftermay'be secured to the foundation plate. W a

In the illustrated embodiment the template Sis secured to thefoundation plate by the riveted ends 6 of pins"! which are inserted in recesses '8 formed'in the punchiholder and are releasably retained thereinby set screws 9 or other releasable fasteners. Also "carried by the foundation plate, belng'secured thereto by suitable means-,-

such as vulcanizinggis apressure pad Ill. The latter, which may be or rubber or of anyother suitable resiliently compressible material, will be referred to hereinafter as a rubber pressure pad. It is so shaped and'soilocated on the foun dation'plate as to extend around the periphery of the template 5 in slightly spaced relation thereto, and preferably-is or thicknessgreater than v the template when uncompressed, althoughcapa-- ble' of compression to a thickness somewhat lessthan'the template. I

The die shoe I is provided withrecess'es ii for guidingly receiving pins I2 :the latterb'eing resiliently backed by sprin'gsib" located-"in the recessesfi-At the' upper nds'of the pins are reduced portions il havmgaloose fit in openings l5'-formed in" a female template die", and-providin'g shoulders l1" tarsummm the latter. The element I6 has a female die opening l8 substantially complemental: to the template 5 at its upper face, and, of course, is in" vertical alignment therewith; Asshown in the drawings, the walls of" opening, it are tapered slightly to permit a; punching l9 jtopiall freely therethrough after having been severed from a stock sheet 20. The template I6, like 5, may be inexpensively formed from sheet metal stock and thereafter hardened if desired.

In operation, with the die shoe I and punch holder 2 installed in a suitable punch press, the stock sheet of material 20 to be blanked is placed upon the element I6 in the usual manner. Upon closing of the press, the rubber pressure pad will first engage the work piece and press. it downwardly, depressing the female template I6 against the compression of springs I3 until the template rests upon the flat face of die shoe. In further movement the template members 5 and I 6 will cooperate to effect the punching operation, the pressure pad holding flat against the template I5 the edges of the material being blanked, while es in the die shoe and the recesses in the punch holder, thereby expediting manufacture. The pins 42 support foundation plate 43 upon which is mounted, by any suitable means, a male template die or punch 44, and, surrounding the latter, a rubber pressure pad 45. The pad may be cut away, as indicated at 46, to provide openings through which the pins 42 may be inserted through the foundation plate.

The pins 42 may be retained in the recesses by set screws 41, as shown in Fig. 3, the set screws being locked by nuts 48. If desired the openings in the punch holder 39 for receiving the set screws may be spaced on the same centers as the the punching I3 from the stock sheet may drop onto the die shoe.

When the press is thereafter opened, which is the condition shown in the drawings, the springs I3 will elevate the guide pins I2, raising the female template so that a space 2| is provided between it and the die shoe. This space is suflicient to permit easy removal of the punching I9, which may be effected, for example, by a blast of air from tube 22, or, if an inclinable press is being employed, the punching may slide off of the die shoe through the space 2| by action of gravity. Or, asuitable implementmay be employed to push or pull the punching out through the opening 2|. In any case, its removal will not require the operator of the press todisassemble or otherwise move any of the die parts;

- It will be understood that the device described lends itselfto rapid and inexpensive production of sheet metal parts. Not only are .the template dies susceptible of inexpensive and rapid manufacture, but a large number of pairs of such dies may be used interchangeably with one or more die sets comprising a die shoe and punch holder, which die'sets by. reasonof their mass are much more expensive-and require longer periods of time and more skillful workmen to produce. .The. only limitation onthe interchangeability-referred to, in addition to size, is that the templates must be of such'shape' that it is possible to provide them-with pins 1 and I2 in locations which will register with the respective rev cesses- 8 and I I, and which will leave a space, such as indicated at 2| between adjacent guide pins I2 through which a punching may be extracted.

In this connection it will be understood that the die shoe and punch holder may be provided with any number of such recesses 8 and. I I, so as to accommodate templates of different sizes and shapes.

In the" modified construction shown in Figs. 2 and 3, the recesses 32 in die shoe 3| for receiving pins 33 that support female template die 34, are provided with shoulders 35 for cooperating with enlargements 36 on the pins to'limit the upward movement of the latter. Springs 31 for raising the pins 33 and the die 34 carried thereby, are retained in the recesses 32 by plugs 33., This provision of enlargements 36 and cooperating shoulders 35 assures parallelism ofthe die 34 with the uppersurface of the shoe 3I when the die is raised, and prevents possible binding of the parts which might result'from one pin 33 being raised more than another.

The punch holder 39 has recesses ceiving pins 42, in vertical alignment with the recesses 32 which receive pins 33. This permits using the same drill plate for drilling the recess- ,recesses for receiving pins 33 and 42, and hence.

the same drill plates may be utilized in forming them. The operation of the device shown in Figs. 2 and 3 will be substantially the same as tive of the inventive principles involved and that these principles may be otherwise embodied without departing from the spirit of my invention orthe scope of the appended claims.

What is claimed is:

.1. .In a die set for blanking sheet metal pieces, a die shoe and a punch holder, a unit comprising a male template die and a rubber pressure pad extending therearound and a foundation sheet for the template die and pad backed by the punch holder, pins having riveted ends securing the male template die to the foundation sheet and detachably retained in recesses in the punch holder,. a female template die detachably supported upon die elevating pins guidingly received in recesses in the die shoe, the female template die having recesses receiving upper end portions of said elevating pins, and'springs in said first mentioned recesses for raising the elevating pins to lift the female template die above the die shoe, the springs permitting the female template die to be pressed against the die shoe by the rubber pressure pad upon closing of the die set.

. 2. In a die setfor blanking sheet metal pieces, a die shoe and a punch holder, a unit comprising a male template die and a rubber pressure pad extending therearound and a foundation sheet carrying said male template die and pad and backed by the punch holder, pins having riveted ends securing the male template die to the foundation sheet and detachably retained in recesses in the punch holder, a female template die rigidly connected to guide means extending into guided connection with the die shoe, and resilient means for raising said guide means to lift said female template. die to a position spaced above the die shoe, the resilient means permitting the female template die to be pressed against the foundation'plate, a female template die rigidly connected to die elevating pins guidingly received in recesses in the die shoe, and resilient means for raising said elevating pins to lift the female template die to a position spaced above the die shoe, the resilient means permitting the dationsheet being aligned with the recesses for.

female template to be pressed against the die shoe by the rubber pressure pad upon closing of the die'set.

In 8 d e t f r blanking sheet metal pieces, r

a die shoe and a punch holder a male die car-s ried by and backed by the punch holder, a fe' male template die having guide pins rigidly con-f 'plate to whichthe pad' and maletemplate die are nected thereto and extending to be received in recesses in the die shoe; andresillent means for raising said guide pins to 'lift the' female 'tmplate die to a position spaced above the dieshoe, l

the resilient means permitting the female template die to be 'pressedagainst thedi'eshoe-upon closing of the die set.

5. In a die set for blankingsheet metal piecesp' a die shoe and a punch jholder,',a unit'cornprisingx a male template die and a rubber pressure pad extending therearound and a, foundation sheet for the template die and pad backed by the punch;

holder, pins secured to the foundation sheet and detachabiy retained in recesses, in the punch holder, a. female template die detachably sup-- springsper'rnitting the female'template die to 'bepressedjag'ainstthedieshoe by vthe rubber pressure 'pad'upon closing of the dieset, and the pins for detachahly securing said'unit being,

the elevating pins, I

6. In a die set for'blanking sheet metal pieces,

a 'die-shoeand a punch holder, a unit comprising a 'male template-die and a rubber pressure pad; extending therearoundv and a foundation secured, means comprising' pins. detachablysecuring the'unit to the punch holder With-the latter backing the' foundation' plate, a female template die detachably but rigidly supported upon die elevating pins guidingly received in recesses in the :die' shoe, nd springs in said recesses for raisingthe elevating pins-to lift the femaleot'emplate die above the die shoe, the

axially aligned with said'elevating pins..

7. In a, dieset for blanking sheet-metal pieces,

' a die'lshoe and al'punch' holden'a. male template ported upon die elevating pins guidingly received in recesses in the die shoe, the female template die having recesses rigidly receiving upper end portions of said elevating pins, and springs in *1 said. recesses for raising the elevating pins to lift the female template" die abovethe die shoe.

7 the springs permitting the female template die to be pressed against the die shoe by the rubber 3 pressure pad upon closing of the die set, andv means for limiting raising of the elevating pins,

'die carried by and backed by the punch holder, 9, female template die detachably but rigidly supported upon die elevating pins guidingly received against the dieshoe upon closing of the die set, and means for limiting the raising movement of the female template.- die as effected by 'said the recesses for receiving the pins of thefoun springs.- v t 1 v g CHARLES H. TAU'SER.