US1070887A - Multiple punch and die. - Google Patents

Description

2 SHEETS-SHEET 1.

Patented Aug. 19, 1913.

Jill? l llllllii! llllllilll S. D. HARTOG.

MULTIPLE PUNCH AND DIE.

APPLICATION FILED AI R. 22, 1912.

a? [Fzaezziazv S. D. HARTOG.

MULTIPLE PUNCH AND DIE.

APPLICATION FILED APR. 22, 1912.

1,070,887, Patented Aug. 19, 1913.

2 BHEETBSHEBT 2.

| II II S'IBIEHBN DR HARTOG, OF ST. LOUIS, urssoum.

MULTIPLE PUNCH AND DIE.

Speculation of Letters Patent.

Patented Amg. 19,1913.

Application filed April 29, 1912: Serial No. 692,520.

To all'wk'om it may concemr Be it known that E, Smrmn: D. HARTOG, a citizen of the United States, and. residing at St. Louis, in the State of Missouri, have invented certain new and useful Improvements in Multiple Punches and Dies, of which the followin isa specification.

This invention re ates to punches and dies,

and more particularly to punches and dies of" the multiple type.

In. the rior art, more particularly where a multip e punch and die was used for punching thin sheets such. as laminae for use in electrical machinery, the die was made of a solid block of metal. It was necessary to make this die of comparatively great depth so as to permit considerable grinding to compensate for wear. Difliculty was exerienced in making such. a. die accurate, and it therefore required for its making exceiptionally skilled mechanics. One of the di culties encountered was due to the fact that. in the hardening and tempering of these dies (having comparatively large bulk), great internal" Slll'fllDS were set up during cooling, causing not only cracking but also warping and deformation. It was therefore necessary to handle the die with extreme care to 'eep aneven temperature- In the use of solid or block dies, especially where'thin material is operated upon, the die aperture is liable to become worn or bellsmouthed. This not only results in an enlargement of the punched hole and the formation of hurs, and therefore inaccuracy ofthe work, but also results in the unchings becoming wedded, thereby throwin undue stresses on the punches. It is there ore necessary to grind the die down until the bellmouthed part. is ground out, which requires excessive grindin at a great cost. Moreover when, a solidor block die becomes broken or defective, even though this defect extends only to one die aperture, the whole die has to be discarded.

A multiple punch as now constructed, consists of a punch holder comprising a solidblock intowhich the punches are set. The manufacture of such punches re uires care- 50 ful fitting in order that the punc es and the punch holder may be properly alined with respect to the die apertures in the die. As the punches must be comparatively long to permit rinding, the d'iificulty of fitting is lncrease in view of the fact that a slight displacement or error (more especially one of inclination) at the root of the punch, will causethis error to be multiplied at the punch point. It is therefore often necessary, after the punches are set in the holder, to properl aline the punches. bystaking or bending t em over. This operation, however, does not only weaken the punehes,but posit-ions them at an acute angle to the die instead of normal thereto, thereby increasing she tendency of the punches to bind in the One of the objects of this invention therefore is to construct a punch and die which can be made with a minimum ofskill'ed labor and expense, and in which the major portions consist of duplicate interchangeable elements.

Another object is to construct a die in which the die face consists of duplicate plates which are interchangeable so that the number of unlike parts is reduced to a minimum. and whereby worn parts mayreadily be replaced.

I Another object is to construct a multiple punch in which the several punches are accurately located with respect to the die in a very simple manner, and in which this lo cation can be accomplished" by means. of duplicate interchangeable members or elements.

Further objects will appear from the detail description taken in connection with theaccompanying drawings in which:

Figure 1 is a plan view partly in section of a punch and die made in accordance with this invention, Fig. 2 is a section on the line 22 Fig. 1, Fig. 3- is a planview of the die, Fig. 4 is a section on the line 4-4 Fig. 3,. Fig, 5 is a section on the line 5.5 Fig. 2,

showing the punch holder in full lines, and Fig. 6 is a section on the line 6-6 Figs. 2 and- 5.

The die comprises a die block or holder adapted to be placed in a punch press. The die apertures are not however in this case formed, in the die block, but the die face con- -sists of a set of duplicate and interchangeable punched aperture forming plates, each having a die-formed contour, and positioned by their contour in mutual engagement to form in mutual assembly a plurality of accurately spaced die apertures. The thickness of these plates is small as compared with. the block form of die, for a purpose hereinafter to be described. .Duplicate plates of the same form as the die plates are secured to the punch holder or block and these plates form together means for spacing and locating the punches in proper cooperative relation with respect to the die apertures.

Referring to the accompanying drawings, and more particularly to Figs. 1 to 4 inclusive, 20 designates a die block or holder recessed as shown at 21 and provided with apertures 22. These apertures are preferably made larger than the punch and the die apertures proper hereinafter described, the object being to leave only partitions 23 of suflicient strength to support the die plates hereinafter to be described. The die face consists of a plurality of aperture forming members or die plates 24 constructed when assembled to form together a plurality of die apertures. These die plates are made accurately to size, in a manner hereinafter to be described, so that one will be the exact duplicate of the other, and so as to make an accurate fit with the recess 21. These plates are secured in assembled relation on the die block by means of screws 25 extending through the block and into the plates. These screws are not however intended to locate the plates in position, but merely to hold or clamp them in assembled relation. The edges 26 of the recess 21 are accurately cut so as to accurately engage and locate the ends of the die plates, and these edges or shoulders 26 are undercut as shown at 26 'in Fig. 4 so as to take care of any slight burs which may be formed on the die plates. The holes in the die block for receiving the screws 26 are made larger than the screws as shown in Fig. 4 so that the die plates can accommodate and adjust themselves in matched and cooperative relation. The screws are merely for the purpose of clamping the plates in assembled cooperative relation on the die block. The finished die formed as described consists of a plurality of die plates each plate of which forms parts of adjacent die apertures, and each of which is located and held in position by the other and by the shoulders 26. These die plates are duplicates and. perfectly interchangeable so that one ma be interchanged for any of the others. I any one of the die plates should become dama ed or worn it can be replaced by another die plate without requiring an entirely new die. Since the die consists of a number of duplicate pieces each having exactly the same shape, the manufacture requires only the accurate making of duplicate pieces of one shape and small thickness, instead of a block construction as in the prior art. Inaccuracies are thus not multiplied as is the case with a solid or block die. The cutting edges of the die plates can be made straight and need not be beveled for clearance, since their depth is small. The die can thus be ground down until entirely worn out without enlarging the die apertures.

The punch holder or block, generally indi cated at A, and shown in detail in Figs. 5 and 6, comprises a plate 27 apertured or slotted to receive the punches 28 and formed with a recess 29 adapted to receive molten metal. The punch receiving slots or apertures 22 correspond to the apertures 22 in the die block and are made larger than the punches as shown in Figs. 2 and 5 for a purpose hereinafter to be described. The under surface of this late is recessed like the die block as shown 1n Figs. 1, 2, 5 and 6, so as to form undercut shoulders 30. This recess is arranged to receive a plurality of plates 31 identical to the plates 24 and secured to the holder in a similar manner by means of screws 35. The screw holes in the plates 31 are also made larger than the screws, so that the plates will be positioned and alined by the shoulders 30 and by each other. These plates form together a plurality of apertures identical to the die apertures and in exactly the same cooperative relation therewith. These plates are arranged to accurately space and locate the punches on the punch holder and with respect to the die apertures in the die block. The slots or apertures 22 in the plate 27 are made slightly larger than the punches so that these punches will be located spaced and alined solely by the plates 31. The punches are clamped in position by means of screws 32 passing through a plate 33 secured to the plate 27, and the screw holes in the plate 33 are also made larger than the screws, as sho'wn in Fig. 2, to allow the plates 31 to adjust the punches. The parts of the punch holder are secured together by means of screws 36, and after the punches are in place the recess 29 is filled with babbitt through a hole 34. A stripper plate 37 is supported on the punch holder by headed pins 38 encircled by springs 39. The punches are thus located and positioned by the plates 31, and after they are thus positioned, the screws and babbitt serve to firmly hold them in located position on the holder.

The plates 24 and 31 must be duplicate and perfectly interchangeable. This requires very accurate workmanship, which would make their cost too great if made by hand or according to ordinary machine shop methods. A special method has therefore been developed for producing these plates. This method will now be described. The method consists in forming the plates to finished size with master punch and die mechanism. In practice two sets of unches and dies are used. One set (roughing set) is constructed to punch the plates to nearly finished size; the plates are then punched to finished size with a second set (finishing set). It is found that in accordance with this method the plates can be punched to the required accurate size withOut requiring additional machining or filing. Only a Single set of punches and dies are required since the pieces 24 and 31 are identical in shape and size. The extreme mechanical accuracy thus extends only to the sets of master punches and dies; thereafter the actual punching of the die plates does not involve high skill, but may be performed by common mechanics. The plates can therefore be produced in quantities at a small cost.

The plates 24 and 31 formed as described above have adie-formed contour providing a part of an aperture, and forming engaging and positioning edges whereby the plates may be positioned by one another in assembled relation to form a plurality of apertures.

The punches are located and positioned in the punch holder by means of the plates 31, and these plates being of the same size as the die plates 24, serve to accurately locate the punches in position and in correct operative relation with respect to the die apertures in the die block. Since these plates are thin as compared with block constructions (whether solid or sectional) they can be made in the manner described With.- out requiring great mechanical skill except in .the making of the master punches or dies for the plates. These plates are interchangeable, and thus one may be replaced without requiring the replacement of the whole die or even its dismantling. The plates are small and comparatively thin;

the required heating and cooling for hardening and tempering will therefore not cause distortion and cracking as is the case with block dies which are of comparatively great depth and large bulk. The punches pass entirely through the die apertures 6., the apertures formed by the die plates 24), and since these die apertures are shallow, and the apertures 22 are large, no wadding of the punchings will take place. This invention therefore results in a punch and die having a low first cost, a low maintenance, having the capacity of accurate duplication and indefinite reproduction.

In the claims the terms plate and punched plate are used as contradistinguished from block constructions Whether solid or sectional. The expression punch receiving aperture as used in the claims is used in its broad sense so as to include and cover the die apertures formed by the plates 2 on the die holder and which receive the punches in the-process of punching, as well as the apertures formed by the plates 31 on the punch holder and which receive and permanently position the punches thereon.

It is obvious that various changes may be made in the details of construction without departing from this invention, and it is therefore to be understood that this invention is not to be limited to the specific construction shown and described.

Having thus described the invention what is claimed is:

1. A multiple punch and die including a holder or block. and a plurality of duplicate interchangeable punched aperture forming plates mounted on said holder or block, each plate having a die-formed contour to form edge locating means said plates being positioned on said holder or block by their contour in mutual engagement to form in mutual assembly a plurality of accurately spaced punch-receiving apertures.

2. A multiple punch and die including a holder or block, and a plurality of do.- plicate interchangeable punched a erture forming plates mounted on said ho der or block, each plate having a die-formed contour providing aperture forming and spacing means, said plates being positioned on said holder or block by their contour in mutual engagement to form in mutual assembly a plurality of accurately spaced punclrreceiving apertures.

3. A, multiple punch and die including a holder or block, and a plurality of punched aperture forming plates mounted on said holder or block, each plate having a die-formed contour providing parts of two adjacent punch-receiving apertures, said plates being positioned by one another in assembled relation to form in mutual assembly a plurality of accurately spaced punch-receiving apertures.

4. In a multiple punch and die, a punched plate having a die-formed contour providing duplicate interchangeable aperture forming and edge locating means, a plurality of such plates being adapted to form when assembled in mutual engagement on a holder or block a plurality of accurately spaced punch receiving apertures.

5. A multiple die comprising a block, and a die face comprising a plurality of duplicate interchangeable punched aperture forming plates mounted on said block, each of said plates having a die-formed contour providing edge locating means, said plates being positioned on said block by their contour in mutual engagement to form in mutual assembly a plurality of accurately spaced die apertures.

6. A multiple die comprising a block, and a die face comprising a plurality of duplicate interchangeable punched aperture forming plates mounted on said block, each of said plates having a die-formed contour providing aperture forming and spacing means for a plurality of adjacent apertures, said plates being positioned on said block by their contour in mutual engage ment to formin' mutualassembly a pluholder, punc duplicate interchangeable rality of accurately spaced die apertures.

7. A multi le punch comprising a punch es supported on said holder, and a pluralit of mutually engaging members on said holder constructed to engage and position said punches thereon.

8. A multiple punch comprising a punch holder, a plurality of mutually engaging duplicated interchangeable members supported on "said holder, said members being positioned and located one by the other in assembled relation to form a pluralityof apertures, and punches supported on said holder and in said apertures and positioned by said members. v

9. A multiple punch comprising a punch holder, a plurality of mutually engagin lates supporte on said holder, saidplates ing positioned and located one by theother in assembled relation to form a plurality of apertures, and punches supported on said holder and in. said apertures and positioned by said plates.

10. A multiple punch comprisin a punch holder,- punches supported on said holder, and a plurality of mutually engaging duplicate interchangeable plates on said holder constructed to engage and embrace 'said' punches, said lates being positioned and located one b the other in assembled-relation on said ho der.-

11. A multiple punch comprising a punch holder, punches supported on said and plates on said holder for spacing and engaging said unches and constructed to locate said punc es on said holder, said plates being positioned by one another independent of 'sai punches. I

12.- A multiple punch comprisin a punch holder, punches su ported on said holder, and a plurality o duplicate interchange able punch locatin plates mounted on said holder and en aging and spacing said punches, one or embracing an adjacent pair of punches.

' 13. A punch and die comprising a die block, a unch holder, a set of mutually en gaging uplicate interchangeable aperture forming members on said die block forming together a plurality of die apertures, punches on said 'punch holder, and a set of mutually engaging duplicate interchangeable members on said punch holder constructed to engage and position said punches thereon. 14. A punch and die comprising a die holder, i-'

said plates engaging and block, a punch holder having punches therea engaging and locating said punch with respect to the aperture formed in said die.

16. A punch and die comprising a die block, a punch holder, a plurality of duplicate interchangeable aperture forming die plates secured to said block and forming together a plurality of die apertures,'a plu rality of punches supported by said holder, and a plurality of duplicate interchangeable plates on said holder engaging and spacin said punches and constructed to locate an position said punches with respect to said die apertures.

17. A multiple holder or block thereon, a plurality of duplicate interunch and die including a changeable aperture forming plates on said holder or block and positioned thereon by said shoulders, said plates being located one by the other in assembled relation to form a plurality of apertures.

18. A multiple punch and die including a holder, a plurality of duplicate interchangeable aperture forming plates on said holder, means for positioning said plates in mutual engagement on said holder, and

plurality of die apertures,

aving locating shoulders means I independent of said positioning 7 means for securing saidplates in assembled relation on said holder.

19. A multiple punch-and die including a holder or block havin undercut locating shoulders thereon, a .p interchangeable aperture forming plates on said holder or block and positioned'thereon by said shoulders,'said plates being located one 'by the other in assembled re ation to form a plurality of a ertures.

In te timon'y whereo I afilx my signature in presence of two 'v'vitnesses.

STEPHEN D. HARTOG. Witnesses: V

J. H: BRUNINGA, FRANKLIN MILLER.

urality of duplicate

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