US2364834A

US2364834A - Punch and die assembly

Info

Publication number: US2364834A
Application number: US514582A
Authority: US
Inventors: Lawrence V Whistler; Sanford A Whistler
Original assignee: Individual
Current assignee: Individual
Priority date: 1943-12-15
Filing date: 1943-12-15
Publication date: 1944-12-12
Anticipated expiration: 1961-12-12

Description

Dec- 12, 1944. L. v. WHISTLER ETAL 2,364,834

` PUNCH AND DIE ASSEMBLY Filed Dec. l5, 1943 3 Sheets-Sheet l Dec. 12, 1944. v. wHlsTLl-:R ETAL PUNCHy AND D IE ASSEMBLY Fifled Deo. l5, 1943 3 Sheets-Sheet 2 Mmmm.

@6 69 ff 70 M PUNCH AND DIE ASSEMBLY Filed Dec. l5, 1945 Y 3 Sheets-511691'l 3 Patented Dec. 12, 1944i V unirse stares, encreur orties.

Lawrence V.

Whistler and Sanford A. Whistler,

Kenmore, N. Y.

Application December 15, 1943, Serial No. 514,582

25 Claims. (Cl. 164-118) rother separate fastening devices requiring the forming of bolt or otherholes atfdenite points within the punch and die retainers or mountings,

and in addition thereto the forming of holes in templates used in conjunction with such retainers or mountings. In many instances, the use of slotted or grooved retainers or mountings are used, into which fastening bolts suited to the slots or grooves are placed and along which they are moved in order to position the punches and the dies axially to perforate a work piece at denite points, but then only in one direction. Under all the methods now known tous employing such fastening elements, difficulty in properly locating or pairing the punches and dies is encountered and considerable time required to set up the assembly for the purpose of operating upon a Work-piecein a manner rpre-designed.

It is one of our objects to simplify the method of positioning' the punch and'die elements of a perforating couple or a perforating unit so as to operate upon a workpiece in a manner predesigned without the use of extraneous fastening devices and to Ilessen the amount of setting-up work required under present day methods.

It is also the object of our invention-to provide perorating elements which include .in their construction means to cause the punches'and dies forming part thereof to be located on their retainers or mountings in any desired position aiially or in any desired relation with respect to each other when more than a single perforating element or couple is used and to adhere to said retainers or mounting without the use of extraneous fastening means of any kind.

It is a further object of our invention to embody in the structure of each of the perforatingelements or units, a magnet which forms a part of each element or unit and causes the latter to adhere to its associated punch'and/ or die retainer or mounting in yany position it may be placed thereagainst, withthe eifective perforating portions of the punch and die in perfect alinement, so that the mere positioning of the punchand die elements, the punch unit, or the punch and die'units, as the case may be, on or against a retainer or mounting will assure retention of said elements or units to saidretainers or mountings in any positions they may be placed thereon with less setting-up work. l 'Y j. i

A still further object of our invention is Lto associate templates with thev perorating devices and to provide' novel means for adjusting and irmly supporting said templatesiwithin a dies'et or other apparatuslor machine in which the work-piece is torhe operated upon.

Other objects of our invention arel to yprovide means for quickly ,removing thel punch and die elements or units from their retainers'oruholders by breaking the magneticinduction or flux between .said elements or units and their respec tive retainers or mount-ings. A j s Our invention, therefpre,l consists in the pro'- lvision of punch and die elementsor unitsemf bodying' in theirjconstruction means to cause said elements or units toiadhere .to retainer or y mounting plates serving as supportsy for the same by the mere placement of said elements or units thereagainst.` M f Y vThe invention further consists in providing .a magnetic perforating element or unit which will beattracted to and maybe retainedonja metallic support or mounting, or 4onrnetallicsupports or mountings, by the mere placementrof the same thereagainst, but Whichkis or4 are capable of ad-Y justment whilesoapplied by sliding movement of vthe unit or the elements on the support4 or supports in any direction toperrnit adjusting the axis of a punch with. respect to the axis of a die and/or to locate the axes of the punch and die with respect' to any point on the support or any points on the supports andthus cause a workpiece to beV perfo-rated according to any predesign provided for the same upon operationv of v a press in which said support or supports' are arranged. i i f The invention further consists in utilizing the punches and dies in association with a template i or templates constructed to assurea perforation or-perforations in the Work-piece according to the pre-design of said template or templates and in providing novel means for adjusting and irrnly supporting said template or templates.

Our invention further consists in the novel feature of construction `and the arrangement and combination of parts to be hereinafter described and more particularly pointed outl in the sub"-` joined claims.

In the drawings:

rFig. 1 is a front elevation of a conventional'diev set 1n which our improved punch and diefassemv bly is shown in a representative manner.

die-mounting. plate Fig. 2 is a horizontal section taken on line 2 2, Fig. l.

Fig. 3 is an enlarged sectional elevation taken `on line 3 3, Fig. 2 looking in the direction of Fig. '1 is a section 'taken diagonally through' one end of the punch holder on line 1 1, Fig. 6, showing the holder in its position of use and the manner of securing a punch therein.

Fig. 8 is a detached perspective View of onefof the members of a template support. Fig. 9 is a detached perspective View of the other member of said template support. y Fig. 10 is a longitudinal section through a dieholder in modied form; it being shown in association with its mounting plate or retainer, its template and a work-piece to be operated upon.

use of templates for the purpose of positioning punches and dies in proper positions within a dieset is desirable, but not necessary. When used, the template for the punch is designated by .the numeral 23 while the template for the die is designated by the numeral 24 and at each end of the die-set a pair oftemplate-supports is provided foreach template. The supports for the punch template are designated by the numeral 25, while the supports for the die template are ldesignated by the numeral 26. Each templateV support coml prises two sections or

members

21 and 28; the

Fig. 11=is a longitudinal sectional elevation of.

a further modified form of die-holder.

Fig. 12 is a sectional elevation of punch and die elements as used when dispensing with templates; said elements being shown in association with their mountings and a work-piece to be operated upon. Y

Fig. 13 is a sectional detail view of a part of a stripping device, such las we prefer to use in association with each punch. t

Reference being had to the drawings'indetail,

the numeral I5 designates a die-set considered as a whole, which may be of any conventional type. As shownit comprises a shoe I6 from which rise guide-posts I1, and a ram I8 into which said guide-posts 'slida'bly fit; the ram being provided with a shank I9 which is adapted to be inserted into the ram-of a press, while the shoe I6 is designed to be secured in.. any approved manner to` The shoe has? slotted ears 20 at opposite ends, through which the table or bed of the press.

securing bolts threaded into the table or bedof the press are passed. Die-sets, of course, vary in size and many are` posts. Itis to be understood that thel die-set illustratedl is selective and .that our improvedy punch-and-die assembly Vmay be employed in any die-set, and on occasions may be used directlyl ina press. Therefore, Where hereinafter reference is made to the ram of a die-set, it may be considered the `ram' or other similar element ofi a press and in referring tothe shoe of a die-set, such element may be considered asthe bed ori table of a press.

In this invention we plate may also be referred to as a punch-retainer or in any other approved manner. Resting upon Athe shoe `II of the. die-set is a By preference the necessarily of such material, nor vso treated.

As is commonly understood in this art, the

provided with four guide` secure a punch-mounting plate 2| to the underside of the ram I9, and this h 22, which may be referred to l as a die-retainer or mounting and it may be ses cured to the shoe in the same manner as the punch-retainer plate is secured to the ram, or in any other approved manner. y mounting plates 2I and 22 are hardened, or made y of hard steel or other hard metal or alloy and l they may be magnetized, and while this is of'ad- Q vantage it is to be understood that they are not 'die-mounting plate 22.

wardly, as best shown in Figs. 3, 8 and 9, and y each base member 21 is provided with a transverse groove 29 which is adapted to receive a transverse tongue 30' on its co-operating retainer or clamping member 28. The inner pointed end of leach retainer or clamping member is reduced in thickness, as at 3I, see Fig. 9. When the two members of each punch-template support are placed in contact with each other, a templatereceiving groove' 32 is formed between the inner ends of said members intowhich` the punch template extends, and in this co-operating relation of the said members, securing screws 33 Ithreaded through the pointed ends of the retainer orvclamping members are tightened against the under side of said template. s' l The two members of each support for the die- `template 24 are similarly formed and co-.operate in a like manner; correspondingparts of such members and `the means for securing the supportr to the die-mounting plate 22 being designated by numerals corresponding with those applied to the two members of each punch templatesupport. After adjusting the

templates

23 and 24 laterally, or otherwise, as vmay be required, vthe securing `screws '33 are tightened against the templates to guard against movementv of the latter. y

' In this invention we employ magnetic punch and die holders, designated lrespectively by the

numerals

34 and 35. ySaid holders may be'basically referred to asl self-retaining or self-adhering holders, since they include in their structure magnets` which serve toattract and retain the holders against ,the punch and die-mounting plates at any point at which they may beplaced,

brought into axial alinement with a view of forcing the operating or effective ends of the punches properly into-their co-operating dies; or, to position the effective ends of the punches and dies axially with respect to any point on a template, or on a mounting, when a perfor'ating device is usedv as a unit and thepunch and die` are maintained'in axial alinement therein. n

Having reference to 'a perforating device 'in which the punch and die are secured in separate elements of a perforating device, each punch holder comprises, in preferred form, an elongated body portion 36 having a downwardly projecting nub or neck 31 at one end which is provided with a socket 38 extending inwardly from its lowerend a suitable distanceto receive the inner end of a down Preferably, each punch is provided Iwith aI depression il which may be annular, as shown, parti-annular, or a spot depression, as may be desired. The nulo or neck El has a collar @E2 coaxial with the socket 3B, and this collar serves as a template locate rhe vnub or neck also has a tapped hole d3 formed therein into which a setscrew hl is threaded, the inner end of which is preferably reduced in diameter and unthreaded and adapted to enter the depression 4l' inthe punch for .the purpose of retaining the punch rmly in its holder.

As clearly shown in Fig. 3, the punch-template 23 is prefabricated to meet the requirements for the punching of the metallic sheet or Work-piece, and with this viert1 it is provided With pilot openings d5 into which the locating collars l2 formed on the punch-holders extend. The punches have their inner ends entered in the sockets Sil of the punch holder and each punch has a stripper-device 13?; secured thereto Which comprises a comparatively thick header lil secured to the punch by means of a set-screw lili, a-shoe into which the operating end of the punch slidably extends and guide-pins ed secured into said shoe atthe four corners thereof and guided )Tor movement in guide openings 5l in the header' lll.l Said guide-pins have heads S2 at their upper ends movable in enlargements of the several guide openings in said header in which said guide-pins are slidably arranged and said heads normally' engage shoulders 53 formed in said guide openings to prevent undue expansion of spiral springs 5d which surround said guide-pins. type are nonT in common use, and since they form no part of this invention they need not be further described, except to state'that when the spiral springs are expanded tothe limit permitted by the heads of the guide-pins, the operatingv ends of the punches are iiush lwith the underside of the shoes de, or substantially sol In the particular assembly illustrated in the drawings.y each die-holder S5 comprises an elongated body portion 55 having a long upwardlyextending n ub or neck at one end thereof. This nub or neck is socketedrfrom its upper end 'ardly, as at 5l, and it has a laterally opening slug-discharge t3 separated from said socket oy an intervening Wall Q providedwith an opening which places the socket Elin communication with the slug-discharge vpassage 5S. The socket 5l be termed adie-receiving socket and i opera with a punch of the type described.

Since each die-holder is paired. Witha punchholder in the particular application of our invention illustrated, the axes of the hubs or necks 3'! of the punch-holder are vertical alinement with the axes of the nube or necks 5t of the dieholders and the die-template 2li is provided with openings through which the dies iii extend; said dies projecting upwardly fromy the body por- Stripper devices of this it is fitted adie 5l designed for matingI Sil entered in openings in the die-template, they ais@ serve as pilots. f

From the foregoing it will be apparent that the punches and dies are to have their-axesl in alineinent and that although the .perforations to be punched in the Work-piece may Vary in size from the'die-'receiving openings in the die-template 'and the vpi'lnch-receiving opening in the punchtemplate,the axes oi these two last-mentioned openings determine the locations of the axes o the holes to be punched in the Work-piece. Our seit-adhering punch and die-holders are,

Iin preferred form, made channel shaped in rcross section from thenub or neck ends thereof to a point in close proximity to the opposite ends of their bodyv portions, andl inthe channel A64 jso formed, magnetsf are placed; spaced -from the material forming thev body portion of the holder by air-gaps 65, such 'as shown in Figs. 4, 5 and 6. rEhe magnet is of a thickness somewhat less than the depth of the channel in Which it is placed and' it is fastened in place by an elongated retainermember El also entered in the channel-like body portion. Securing screws li areypassed through the inner Wall or" the chan'- nel and the magnet and into the retainer member el, as best shown in Fig. 5. These securingscrews are formed of brass or other non-magnetic matelrial so that'no portion of the magnetic force or energy of the magnet is conveyed to the holder proper. `f

The air-gaps between the side and end Walls of thel channels and the magnets'may be filled with non-magnetic material so that the holder is fully insulated from the magnet. The magnets, in each instance, are preferably flush with the edges ci the confining 4Walls' 'of the channel s'o that when placing these holders against the upper Surface of the die-mounting plate and/oi" the lower surface of the punch-mounting plate, the magnetic iux or force passing across the air or insulation gaps Will attract the holders to the mounting plates Vandretain them in any desired gated and conform substantially to theoutline4 of-v the magnets provided on their contact `iaes with a slight elongated depression 69 extending from end to end thereof, thus providing elongated contact regions 'it along the full length thereof and at opposite sides oi' said elongated depression.

Any other manner of securing the magnets to the holders may be provided, so -long as provision is made for non-magnetically insulating Said magnets from the holder so that no portion of tions the diehclders a distance slightly greater the material of Said holder, the punch, or other parts in Contact therevlithfbecome magnetized,

The punch and dieholders are orf-like construction, but the nubs or necks of the die-holdersv are usually of greater length than those' of the punchholders in order to accommodate the dies ill and to provide space for the slug-discharge passages' 53. The dies are secur rtinpl'ac'e vby s'et screws il, as bestv shown inrFig. l0. AThese set screws may-'oe located at onev ci the corners of the niibs or necks of the die-holders, or they may be placed at any other points ofthe necks; for example, at oneside of the neck, as'shown in Fig. 10.

tvs-msn to stress the point that while themagfy The magnet is and the die-receiving holes 62 in the die-template.

The

templates

23 and 24 and their respective supports may be dispensed with and in such cases pilot holes 12 are 4drilledin the mountings 2| and 22, in the same manner in which the

holes

45 and 62 are drilled through the templates 23'and 2-4, so as to assure axial alinement of these holes when the mountings are associated with modiiied forms of punch and die-holders, as clearly shown netic force between the holder and mounting and permit the holder to be removed.

Inl Fig. 11 we show a modified form of release device for the holder and in this instance a screw bolt 11 is passed through the holder at its outer end, outside of the area in which the magnet is located. Normally this screw bolt has its end out of contact with the surface ofthe mountingv on which theholder is magnetically retained and by tightening this screw, the holder will be lifted from the surface of the mounting so that it can be easily removed therefrom.

kAs hereinbefore stated, the construction of the holders may be varied and the magnets thereof in Fig. 1,2. The punch and die holders are there shown provided with pilot pins or studs 13 which extend outwardly beyond the bearing faces of the holders and these pilot pins or studs are entered in the holes 'l2 in the mountings. The pilot pins are, of course, co-axial with the punches 39 and the punch-hole openings in the dies 6|. In such cases, the punch and die-holders are rotatably movable under .force while attracted to the mountings, the pilot pins serving as centers on which the mountings may swing, but such movement or adjustment does not in any manner permit variation in the axialposition of the punches and dies and the only advantage lies in the fact that the extensionsA or elongated body portions may be swung to positions that will not interfere applied in any approved manner, examples of variation being illustrated'in Figs. 10 and 11 wherein we illustrate anon-magnetic contact toe or fulcrum element 18 which may be formed of brass or other non-magnetic material and which may be applied to each holder, regardless of its construction. In such cases, when actuating the release device, such asv shown at 14 or Tl, theholder will lbe fulcrumed on this non-magneticrv t contact-toe and an immediate. release assured when the opposite end*v of the device is lifted slightly from the mounting. Such contact-toe may also be used where no release device is pro- Y vided, since a thin blade or other similar object may be forced between the holder and its mounting at the end opposite the contact-toe'and quick release of the holder be assured.

Our' improved self-retaining holders may be utilized in various forms, whether used as couples or in a form in which both the punch and die is i', embodied in a single structure; and it is further to be understood that it is not our intention to with the extensions or body portions of other l punch and die-holders used in the assembly.

As is now the practice in preparing a punch and die assembly for perforating a work-piece, such as the sheet of metal shown in the drawings, the perforations in the work-piece are to have their centers in axial alinement with the centers of the punch-receiving openings and the die-receivingopenings '62 in the

templates

23 and 24, re-

spectively. These templatesv may be adjusted longitudinally and/or transversely, or obliquely, by adjusting the same within the template-receiving grooves v32 formed in the` template supports 25 and 26, and when adjusted to the de- 'sired positions, the set screws 33 will V positively retain the templates in position after tightening said screws.

Any permanent magnet may -be employed for the' purpose of this invention, but we preferably employ what are commercially known as Sintered-Alnico magnets, which may be cast or otherwise shaped to conform to the channels in the punch and die holders, which are, of course,` varied in size and shape, as required. Each punch and die-holder may be provided with releasing means to overcome the magnetic force of its magnet and thus disengage the holders fromtheir mountings. In Fig. 10 we have shown a lever 'I4 provided with a parti-circular inner end 'l5 eccentrically mounted on a pivot pin 16 to create a cam-like contact member normally out of con-` tact with the mounting and having its lever eX- tending therefrom to serve as a handle. Upon swinging the lever or handle outwardly and downwardly from the position shown in Fig. 10, the throw of the cam-like lowerend forcibly engages the surface of the mounting and thus lifts the holder from said surface so as to break the mag` limit the invention to perforating-devices, since it may be embodied in punches and dies employed for blank-stamping, forming, or other purposes. Therefore, where in the claims the term punch and die assembly is employed it is to be considered basically so as to include the male and female elements of stamping devices, which may be referred to as punch and die, respectively, as well as those of perforating devices.

Itis not unusual-to require stamped parts with a great many perforations, particularly in .air--l plane work, and oftentimes these perforations differ in size. In the stamping of parts, lightening openings are also required in addition to perforations. On occasions, several thousand or any other denite number of these stampings are required with the perforations in a definite relation to each other and to the lightening openings. It however is not unusual to require modifications for such stampings in which changes in the relationship of some of they perforations must be y made, spacing varied, or some larger or smaller perforations are required. This may occur several times, yety most ofthe perforations and the lightening openings will have their relative positions changed. In vsuch cases it may be found necessary to change only a comparatively -small number of punches anddies for stamping the modified structures.v Consequently, such punches and dies as are known to be 4retained in unchanged positions may be fastened in place on their retainers or mountings by means of bolts in the usualv manner and such as will require change in positions maybe used in accordance with this invention. This would permit the changes to be made quicklyvand easily without the need of tools for attaching or detaching the punches and dies.

Naturally we prefer, yeven under' such conditions, to utilize punches and dies embodying the principle of our invention throughout the entire punch and die assembly.

We also Wish to stress the fact that in this invention, no electric current o-r electric-conducting Wires are requiredwhich however is the case When electro-magnets are employed and current applied to individual punches and dies could not beused because of the current-conducting Wires, which would at least vequal in number the punches and dies used and would by reason of occupying the stamping space in a die-set, interfere vvith the stamping or perforating operations,

Having thus described our invention whatwe claim is:

1, In a punch and Vdie assembly, a pair of mounting plates spaced apart, a punch-holder self-adhering to one of said mounting plates'and having a. punch, and a die-holder self-adhering to the other of said mounting plates and having a die for co-action with said punch, said punch and die-holders being adjustable on said mounting plate to enable the punch and die of said holders to be axially alined.

2. In a punch and die assembly, a pair of spaced apart mountings, a punch-holder having apunch anda magnet attracting said punch-holder to one of said mountings and retaining said punchholder thereon, a die-holder having a die and a magnet attracting said die-holder to the other of said mountings and retaining said die holder thereon, said hol-ders being adjustable on said plates while magnetically retained thereon to position the punch and die of said holders in axial alinement. j

3. In a punch and die assembly, a pair of mountings spaced apart, a punch-holder having a punch-receiving portion and a magnet attracting said punch-holder to one of said mountings and retaining said holder thereon, a die-holder having a die-receiving portion and a magnet attracting said holder to the other of said mountings and retaining said die-holder thereon, and means -for non-magnetically insulating the punch-'receiving portion of the punch-holder and the die-receiving portion of the die-holder from said magnets.

4.-. In a punch and die-assembly, a punch-holder having a punch and being adapted to be placed in contact with a metallic support, and a die-holder having a die and being/adapted to be placed in contact with a metallic support, Vsaid punchholder and die-holder embodying in their construction means to cause the said holders to adhere to said supports by mere contact therewith.

5. In a punch and die assembly, two spacedapart mounting-plates, punch and die-holders embodying in their construction permanent magnets serving to cause said holders to adhere to said mounting-plates, said punch-holder having a punch secure-d thereto and said die-holder having a die applied thereto, said punch and dieholders being 'adjustable on said mounting-plates under sliding movement thereon to enable the punch and dies thereof to be axially alined While magnetically attracted to said plates. f

6. In a punch and die assembly, two spaced-A apart mounting elements presenting contact surfaces for punch and die-holders, a punch-member having a punch, ache-member having a die-opening to receive the operating end of said punch, a permanent magnet built into said punch-holder and serving to cause the latter to adhere to one of said mounting elements, a permanent magnet built into said die-holder and serving to cause the latter to adhere to the other of said mounting elements, and release means carried by said punch andQde-holders for. releasingt` said holders `from said contact surfaces.. f y e T In a punch and/die `,as`sembly, tWo spacedapart' mounting elements presenting contact surf' faces for punch and die-holders, a punch-holder havinga punch, a die-holder having-adie-opening to receive the operating end of said punch, said punch-holder having'an elongated body p0rtion and a punch-receiving portion at one end thereof in which said punch is removably secured, said die-holder having an elongated body portion and -a die-portion at one end thereof in Which said die-opening is arranged, a permanent magnet carrie-d by the elongated body portion of each of said holders, serving to cause the latter to magnetically adhere'to its associated mountingelement, -means for non-magnetically in'sulatller said magnets from' said punch and from saiddieportion, and a release-screw threadedinto one end of each of said elongated body portions and adapted to lift the latter from said Contact surfaces to release the punch and die-holders therefrom. l j

8. In a punch and die assembly, two spacedapart mounting e'elernents presenting contact surfaces for punch 'and die-holders, a punch-holder having a punch, a die-holder having a die-opening to receive the operating end o f saidpunch, said punch-holder having anelongated body portion and a punch-receiving portion at one end thereof in which said punch is removably secured,

said die-holder having an elongated body portion and a die-portion at one end thereof in which said die-opening is arrangede permanent magnet iitted into the elongated body portion of each of said holders, and a cam-device pivotally connected to the opposite end of each of said holders for releasing said holders 'from said contact surfaces.

9. In a punch and die assembly, vtvvo spacedapart mounting elements presenting Contact surfaces for punch and die-holders, a punch-hol-der having a punch', a vdie-holder having a die-opening to receive the operating Vend of said. punch,

y said punch-holder having an elongatedbody portion and a punch-receiving portion at one end thereof in which said punch is removably secured,

sai-d dieholder having anelongated body portion and a die-portion at one end thereof in which said die-opening is' arranged, permanent magnets tted into the elongated body portions of said holders and non-magnetically insulated therefrom, said magnets servingto cause said holders to adhere to said contactsurfaces, release-means at one endl of each of sai-d elongated body portions for lifting the latter out of contact from thecontact surface to which it adheres, and a non-.magnetic element at the opposite end of each of said holders normally in contac'tvvith said contact` surface and serving as 'a ulcrum on which said holders swing When the opposite ends thereoffare lifted from said Contact surfaces by said releasemeans. f

10.` Ina punch and dieassembly, superimposed 4 spaced-apart punch and die-mounting plates, punch-template supports secured to the underside of the upper mounting plate at opposite ends thereof, die-template supports secured to the upper side ofthe lower mounting plate at opposite endsr thereof,y a' punch template provided with pilot openings centered to the holes to be stampedA in` a work-piece `and being adjustable Vini-said punch-template supports, a die templateprovided` I upper member adapted to be rigidly mounted on said ram and means to cause Asaid shoe and upper with pilot-openings alsocentered to the holes to` be stamped in said work-piece and being adjust` able in saidv die-templatesupports, self-adhering punch-holders applied to the underside'of the said upper mounting plate and having punches eX- t'ending axially through the pilot-openings in said punch template, self-adhering die-holders -having dies extending through the pilot-openings in said` die template and adapted to have the work-piece l to be punched rest thereon, said punch and dieholders being slidable on said mounting .plates while adhering thereto for adjusting the same toA the pilot-openings in said punch and die templates, and stripping means associated with said punches.

l1. In a punch and die assembly for use in a press having a stationary bed and a reciprocating l ram, comprising a die-setl having a lower shoe adaptedto be rigidly mounted on said bed, an

member to operate in alinement,l a pair of plates detachably mounted, lone against the underside of said upper member and the other upon said shoe, a plurality of punch anddie implements,

L each including magneticmeans to cause them to be attracted to said plates, said punchrand die 1 implements being adjustable over the opposing surfaces of said plates while magnetically attracted thereto to enable the punches of said punch 12. A punch and die assembly for use in a press by said ram, means to cause said upper member and shoe to operate in alinement, mounting plates secured to said upper member and tosaid shoe, f

a plurality of punch and die implements ladapted to act on the Work, each implement having a laterally-directed extension provided with a magl net adapted to cause said implements to adhere l to their mounting plates, yet allow correct positioning of said implements on said vplates ywith ments .in axial alinement.

I magnetic means embodied in the construction of l implements and the dies of said die implements to be axially alined.

the co-acting parts of said punch and die imple- 13.- A vpunch and die assembly including a pair Y of spaced-apart plates adapted to be mounted on two relatively movable members of a press or die- 3 set, template supports secured to each of said plates, templates adjustably secured to said sup- 1 ports in spaced relation to each other and to said plates and having a plurality of axially-alined positioning holes therein, and a plurality of pairs of punch implements and die implements having parts fitting within said holes in said plates and 1each implement including in its structure means `for retaining the same against its co-operating `plateby the mere placement of said implement thereagainst, said punch implements and die implements having punches and dies, respectively,

axially alined and being adjustable on said plates l `by sliding movementthereon in any direction.

14. In a punch and die assembly, two co-o'perating members normally spaced apart and arranged 'for movement toward and rfromV each other, a die member self-retained by the mere` `placement thereof against one of said members, `and a punch adapted for co-action with said die member for operating upon a work-piece. 15. In a punch and die assembly, two co-oper- Vating members normally spaced apart and arranged for movement Vtoward and from each other, a die member having as part of itsstructure a permanent magnet whereby said die member is caused to adhere to one of said co-operating members, and a punch' adapted for co-action with said die member upon a work-piece.

16. In a punch and die assembly, two co-oper'- ating members normally spaced apart and arranged for movement toward and from eachl other, means for perforating a sheet Yo1 metal or other sheet material comprising a punch,v a `die for co-action with said punch, means for holding said die in axial alinement with said punch, and

movably secured to said holder.

18. In a punch' and die assembly, av die-holder including a permanent magnet adapted to cause said holder to be self-retained against a metallic member of a die-set or-press under contact of said holder therewith, said holderhaving a dieopening adapted to receive a punch upon a work-piece.

19. In a punch and die assembly, aperforating device comprising two units, one a punch and the other'a die, magnetic means embodied in the construction of said units to cause said device to adhere to material forming part of a press or die-set by the mere placement of said device thereagainst.

20. Ina perforating device', a hollow elongated body portion having a punch ordie at one end thereof and av magnet'located in the hollow of said body portion, said magnet being non-magnetically insulated from the punch or die forming part of said perforating device and causing said body portiony to be attracted t0 a metallic part of a die-set or press so as to be retained thereagainst while permitting adjustment of said body portion by sliding movement over the surface of said metal. y

21. In a perforating device or the like, a perforating unit having two metallic parts, and a -permanent magnet in contact ywith said parts, `said parts 'being otherwise spaced apart and serving as opposite magnetic poles. Y Y 22. In a perforating device orthe like, an operating unit having two magnetic metallic parts and a magnet between and in contact with said parts, said parts being otherwise separated nonmagnetically and both parts being'adapted for Contact with a metallic support, the so separated portions kof said parts serving asopposite magnetic poles, respectively. j H

23. In a perforating device or the like, an operating kunit comprising a hollow part having a` `and, whose edges are non-magneticallyY spaced from said surrounding walls, the fouterface of said metallic element andthe edges of said surrounding walls lying in the sameplane, and serving as opposite magnetic poles.'

for operating 24. In a perforating device or the like, an operating unit having a body comprising a permanent magnet and two metallic parts spaced apart by said magnet and between which said magnet is secured, said metallic parts beingy otherwise nonmagnetically spaced from each other, the nonmagneticallyspaced-apart portions of said metallic parts having contact surfaces in the same plane serving as opposite magnetic poles and said body also including a part for operating on a work-piece.

25. In a punch and die assembly, a metallic support, an operating unit having a metallic body apart regions in the same plane for contact with said metallic support, said metallic body having also a part for operating on a work-piece and said spaced-apart regions thereof serving as opposite magnetic poles to cause said body to be attracted 10 to said support.

LAWRENCE V. WHISTLER. SANFORD A. WHISTLER.