US2183702A - Die assembly for forming hollow metal articles - Google Patents

Description

Dec. 19., 1939. F. B. WENDEL 2,183,702

. DIE ASSEMBLY Fon Pomme HoLLow METAL'ARTICLES Original File-d May 1l, 1937 2 Sheets-Sheet l Il' ggz.

lg, l

mum@ f 2 Sheels--Sheetv 2l r//A. g il Z ,an m W wm m. ML

Dec. 19,` 1939. F. B.. WENDEL DIE ASSEMBLY FOR FORMING HOLLOW METAL ARTICLES original Filed May 11, 1937 Patented D. 19, 1939 UNITED s 'rATi-:sI

aisance mE ASSEMBLY For, roxanne., noLLow METAL An'rlcLEs Fran? Bertil Wendel, Waterbury..

original application May 11, viiizi'z, serial No.

141,936.` Divided and this application Decemfbcr 9, 1938, Serial No. 244,781

zciaims; (ci. s-4.a)

This invention relates to improvements in die assembiies/and particularly to die assembliesior forming hollow sheet-metal elbows or the like.

This application is a division of my application 5 Ser. No. 141,936 filed May 11, 1937.

One of the objects of the present invention is to provide a superior die assembly or the character' referred to which may be produced at a lustrated'in Figs. l, 2 and 3, the grooves II. I8,

low cost for manufacture. l0 Another object is to provide a superior die f assembly in which the component units maybe readily opened and closed.

With 'the above and other'objects in view,y as

will appear to those skilled in theartd'rom the Il present disclosure, this invention includes all features in the said disclosure which are novel over theprlor art and which are not claimed by me in a'separate application.

'In the accompanying drawings -in which one way of carrying out the present invention. is

shown for illustrative purposes:

ng. 1 is a vertical sectional ,view online l---iA oi Pig. 3, with certain of the parts shown .in elevation and with plungers and= blanks added; g5 Fig-2 isa view similar toFl' 1 but with more oi' the die assembly shown in e vation, and also.

illustrating 'a different stage of the operation;

Fig. 3 is a top plan view oi the die assembly shown in Figs. 1 and 2, without the plungers and goblanks:

Fig. 4 is a broken view thereof in end elevation;

5 is a perspective view of the die assembly with one oifthe guide-dies shown detached'and in vertical longitudinal section; l. l j

' Fig. 6 is a side elevation partly in section oi a secpnd-stae elbow blank;

7 yis a side elevation partly in section oa thirgltage'elbow blank: and .8 is 8 side elevation partly. in section oi a o completed elbow.

f 'nie die assemmy ulustrated in rigs. .its 5 of' the drawings includes yan inverted T-shaped de- -die unit which comprises a base'block Ilan a vertical block ll'rigidly secured together 5 by a suitable number oi dolci-pins l2 andscrews ll. The opposite vertical walls lor laces i4 and i5 of the vertical block il are respectively formed with a plurality of vertical guide-channel grooves `ll .and l1 which are respectively smoothly- 50. merged byarcuate deilecting-channel grooves I8 ilv with horizontal f deflecting-channel.

grooves 12| and 2| in the VAupper i'ace of the base and blockll. 'I'he grooves It to2l are, in eilect, conf "tinuous andare all 'of-semicircular forni in crossan section.

Fitting into the angular notch-like recesses provided on the opposite sides of the detlecting-die l unit, are guide- die units 22 and 22 respectively having yvertical guide-channel' grooves 24 and' 25 whichare respectively merged by larcuate de- Il flecting-channel grooves' 26 and. 21 with horizontal deflecting-channel grooves 28 and-29 in the under laces of the units 22 and 22. As ilva, cylindrical stop-abutment secured to the base block I0 by a screw 26 and havinga nat -20 inner-face 21.

-'Ilie guide-die units 22 and 22 oi the dicas- Y sembly illustrated in the drawings may' be brought into assembled relation and held therein by any suitable means, such, ior example, as the mechanism illustrated Emy previously mentioned application ser. No. 141,936 which is adapted to 'actuate the guide-dieunits horizontally back and forth betwreen the open dotted line and closed full linepositions shown in Figs. 1 and 2 by means so of the I members 2l an 2l. The plungers Il and 4I are carried by a pl er-head or ram (not shown) of any suitable p ess. such, for example.'

aas thatillustrated in my afore-mentioned application.

First-'stage or test-tube shaped blanks 4t2 of u copper or other suitable metal, after havingv been filled with oil or the like, are forcibly displaced longitudinally by means oi the plungers 40 until they seat in the' hemispherical recesses. 34 of the o stop-abutments 32. In this operation,- due to .the-

fact that'each curve .IB is of greater length than curve 26, metal which initially occupies the central bottom location indicated at 42 oi the blank- 42 shown in Fig. l, will move Aaround to some such position as indicated at 44 ot the'secondstage L-shaped blank '45 in Flg`.2.

The second-stage blanks 45 shown atthe left of Fig. 2 and also shown in Fig. 6, after being sultably annealed and'tllled with liquid, are placed m in the channels 2l in the right side oi Fig. 1 as illustrated in the said ligure, and first-stage blanks l2 are placed in channels 30 in the left side of Fig..l. The guide-dies 22, 2l are then 4closed to full line assembled position shown in M Fig. 1, whereupon when the plungers 40 and 4| are forced downward by the plunger-head (not shown), the first-stage blanks 42 are formed into second-stage blanks 45 and the previously formed second-stage blanks 45 located in the channels 3| at the right of Fig. 1, have their rounded ends 46 forced outward to become the'at ends 41 shown at the right of Fig. 2, to form the thirdstage blanks 48 shown at the right of the figure referred to and in Fig. 7. By removing the at end portion 41 of the third-stage blank 48, a nished elbow 49 is produced as shown in Fig. 7. The elbow 49 may, if desired, have one or both of its respective opposite ends expanded as indicated by broken lines at 50 in Fig. 8.

It will be appreciated that instead of making two different stage blanks at one operation as illustrated in Figs. 1 and 2, the die assemblies could be so constructed and operated as to make all blanks, at a given operation, the same or duplicates of one another, by having the right-hand stop-abutments identical with those at .the left hand of Fig. 1.

By providing a die assembly which is divided in planes transverse to the plane of the elbow to be produced rather than dividing, the dies in a plane parallel with the ilatwise plane of the elbow, not only is i'nterchangeability achieved,

but the various units may be accurately and' economically produced. For instance, the guideand defiecting-channel grooves of the defiectingdie unit may be conveniently produced by a sim ple milling operation, and similarly the guideand deilecting-channel grooves of the guide-die units may be milled. Furthermore, in forming the rounded portion or fillet interconnecting the adjacent ends of the straight grooves, a die-unit may be revolved about the axis of the said rounded portion so that a milling cutter will serve the purpose of producing this portion also, rather than requiring time consuming and expensive die-sinking operations which would loe necessary were an angular recess to be formed all in one face of a die-block. Also, the fact that the stopabutments 32 and 35 are separately made and.

separately attached to the die assembly, facilitates forming the defiecting-channel grooves by a milling cutter with complete freedom and`hlgh speed without the need of special nishing operations for forming the end surfaces 34 and 36 of the stop-abutments, such as would be necessary if the stop-abutments were integrally formed with either the base block or guide dies.

'I'he invention may be carried out in other specific ways than those herein set forth without departing from the spirit and essential characteristics of the invention, and the present embodiments are, therefore, to be considered in al1 respects as illustrative and not restrictive, and

all changes coming within the meaning and equivalency range of the appended claims are intended to be embraced therein.

I claim:

1. A die assemblyV for forming hollow metal articles comprising: two similarly-constructed guide-die units, and a single deflecting-die unit; each of thev former having angularly-related faces substantially coextensive with angularlyrelated face-portions of the latter; the said defiecting-die unit including oppositely-extending base-faces arranged below and respectively facing one of the angularly-related faces of each of said guide-die units, and the said deflectingdie unit also including oppositely-facing sidefaces interposed between said guide-die units and respectively facing the other angularly-related face of each of the said guide-die units; the latter being each provided with a groove extending from end to end thereof in its said angular-lyrelated faces and providing one complemental half of an article-forming channel therein; and the said de'ecting-die unit having a groove extending from the outer end of each of said oppositely-facing side-faces to the outer end of each Yof said ppositely-extending base-faces, the grooves of the said deflecting-die unit each providing one half of' an article-forming channel and respectively complementing the half of the article-forming channel in each of the said guidedie units.

2. A die assembly for formingA hollow metal articles comprising: two similarly-constructed guide-die units, and a single defiecting-die unit;

spectively facing the other angularly-related face y of each of the said guide-die units; the latter being each provided with a groove extending from end to end thereof in its said angularlyrelated faces and providing one complemental half of an article-forming channel therein; the said deecting-die unit having a groove extending from the outer end of each of said oppositelyfacing side-faces to the outer end of each of said opppsitely-extending base-faces, the groovesvof the said defiecting-die unit each providing one half of an article-forming channel and respectively' complementing the half of the articleforming channel in each of the said guide-die units; and separate abutment-members, e'ach constructed and arranged to intert with and to be xedly secured in place in the groove of one of the said guide-die units and the complementing-groove of the defiecting-die unit adjacent the terminating outer ends of the respective grooves, 'to close the said article-forming cham,

Images