US1156972A - Apparatus for forming hollow articles by dies. - Google Patents

Description

,H. G. CARLSON.

APPARATUS FOR FORMING HOLLOW ARTICLES BY DIES.,

APPLICATION FILED 050.28. 1914.

1,156,972. Patented 00t.19,1915.

2 SHEETS-SHEET 1- Inventor g gf I fllaaimiz ,b S 5% I, m of Wm y Am H. G; CARLSON.

APPARATUS FOR FORMING HOLLOW ARTICLES BY DIES.

. APPLICATION FILED DEC.23, 1914. 1,156,972.

Patented Oct. 19, 1915.

2 SHEETS-SHEET 2.

r Inventor" ULdnessew- 6 016 .1%77;r-. z shmmazz 1?. (7 WM Attorneys.

COLUMBIA FLANOGRAIH c0.. WASHINGTON D. c

HJALMAR' e. cennson, onwonqnsrnn MAssaeirUsETTs, essrcnon no, itocirwoon SPRINK ER COMPANY, OF MA A SET el Conronerron or MASSACHUSETTS.

A AT sFonFoR-nm-G LLOW enric es i' ma er To all whom it may concern: 1 Be it known that I, HJ LMAR G; Game son, a citizen of the UnitedStates, resldlng at WVorcester, in the county of Worcesterand State of Massachusetts, have invented a new and useful Apparatus for Forming Hollow Articles by Dies, of which the fol-..

lowing is a specification. I V y This invention relates to an apparatus for forming articles from sheet metal by means of dies. a i z The principal objects of the invention are to provide for eliminating the reheating, or annealing: process, v heretofore, necessarily employed, in drawing out'sheet metal blanks into th'eform of hollow tubular or polygo-f nal parts; to providean arrangement ofdies by which the reheating and annealing steps 7 are avoided; to provide an arrangement, of

view of a die bed, punch block, 'a nd set of dies connected therewith, arranged in ac-f cordance with this invention; Fig. 2 Isiaplan of the die bed and dies thereon showing 7 the die punches in transversesection; 3

I is a plan of the reducing die Fig. a is a plan of-the finishing die; Fig 5is a perspective view of the cup sha ped blankj'and Fig. 6, is 7 ventionjisshown asapplied to ardie' press-Q having the usual die bed 10 secured in posit tion by bolts 11, or in anyother desired way, This cooperates with a punch block 12,. mounted on ai-plungerand adapted to recipgio'o rocate therewith This punch; bl0olr,- as

a similar view ofthe product. i

This invention relates to that class a of Work in which sheet' metal blanks are cut out to a convenient shape .and then cupped and finally elongated and' 'shaped for the purpose of producinghollow articles, such asshells and; the like, of polygonal or even cylindricaliorm, but of e a length considerably greater. than that of the first cuppedout blank. Heretofore, so far as 'I am aware, articles of this kind have been produced by, a series of'dieingoperationsf. A

special 'set' of dies has been'nec'es'sary forv number of recesses -15, adapted :v o ,:be "lo-*- cated directly under the punches Each; re- 116 each operation. and consequently as .ecial fmachiner This-necessitated the per orm-e Specification of Letters ity of sets-of dies, Thisw'as due to the fact proper position by placingqthepreviously and then shifting the-diebed until'it' -was thepunch Obviously, this operation-could e performed so as perfectly-zto registeru of femaledies. 1

P tented a 19,1515,

Application filed December-28,1914; Serial No. 879,339. 1

w ance of these operations, one at atime, and

the cooling of the blanks between each'oper ation and the subsequent one. As' it was" necessary. to have the blank in as soft a con- 'd 'tion as POSSlblGlIl' order that "each @pem-- tion inlight be performed efliciently, the blanks were put in an oven and reheated just before each operation.- This necessarily I added materlallyto the expense of the whole" I procedure and necessitated the *handlingof 5 V the -blanksin a certaindefinite manner. If there was any long interruption in the se'-' ries of operations, an additional heating had to hB-glVGIl to the blanks; f i

Another difficulty which has interfered with the speeding .up' of these-operations,

has =bee'n'the' fact thatsojfar as'l'amaware, i

it'has always been impossible to carry out--- these, operations on a press having "alzplurale that each die bed-was made so thatthe die'i which it carried could be clamped thereon or released so thatit could be,replaced,- but i so thatit alwaysoocupied; the'same position i on thebed. The-parts were set up in the formed articleon the'end ofthe punch and v bringing thegpunch down into the female die broughtto a perfect center :with respect tonot two or morepunches; with'a corresponding J One of.v the objectso'jfl this invention to provide .a simple andpr-acticable ar-ranges.

l-ment wherebygroupsof dies can be mount;

"ed; on the same machine. and accurately cen- V tered, each with its own punch Referring now. to the drawings, theiinhown in the present case,- is prov de ith .7 two die punches 13! :Each of these is:

they are octagonal in 11501111;

' The. di, bedis provide with the so a cess is provided as usual with a passage 16 for receiving the end of the punch. In each of these recesses 15 is placed a die member 17 smaller in size than the recess. Preferably the recess and die member are both circular. For the purpose of accurately centering each of these die members and securing them-in adjusted positions, adjusting screws 18 are provided, preferably three in number. 7

' Above each die member'l'? isa second die member 19 having a central depression 20 for centering it on a projection 21 on the die member 17. This, as will appear, is the reducing die, While the die 17 is the finishing 'die.

to permit of the necessary adjustments.

it is to be noted that each reducing die has a central opening therethrough of circular cross section, flaring out at the top to assist in guiding the cup-shaped blank into position. In this way the operation of the punch in the reducing die-is to elongate the blank and reduce its diameter.

The finishing'die is provided with a central perforation registering with and, preferably as shown, forming a continuation of the passage through the reducing die. It is flared out at the top to a diameter equal to that of the bottom oi the passage in the reducing die. The upper portion of the pas: sage in the reducing die is circular, but 1t 18" gradually reduced to the desired polygonal formand retains that form to the bottom.

In the form shown, it is of course of the same shape as the punch 13, but of larger size. The difi'erence represents the thickness of the metal of the article to be produced.

In operation, the diebed is fastened in. position approximately centrally with re-' 'The bolts 2 1 are then tightened to scour them in their proper places.

The operation of reducing an article is as follows: A flat piece of sheet steel, or other metal is punched out to the desired circular form. It is then preliminarily operated upon in an ordinary set of dies to form a shallow cup A. Two of these cups, preferably while cold, are placed by hand on the tops of the two dies 20 and the punches brought down. The first effect of the punching operation is to simultaneously reduce these two cups in the reducing dies and at the same time elongate them. This, accord ing to the old system, would be the end of this step of the operation and the blanks thus reduced would be taken out of the machine and thrown aside to be reheated when ready to go through the neXt operation. But according to my invention, reheating does not have to be done because I have discov- 'ered that the operation of reducing just described imparts enough heat to the blank to permit ofits being introduced immediately into the finishing dies and finished, provided it is not allowed to cool on". Consequently, by my procedure, ll not only re duce the blank, but the continuous motion of the punch, I force the heated blank into the finishing die and finish it at the same heat.' Tn this way, no reheating has to be done after the blank is first introduced into the'reducing die. It will be seen in this way that by use of two punches, four operations are simultaneously performed, namely two reducing and two finishing operations, where only one reducing or one finishing operation has been practicable heretofore, and furthermore, the delay and expense of the usual reheating between the reducing and finishing operations is entirely eliminated. Even the reheating ovens can be dis pensed with in some factories.

Although I have illustrated and described only a single form of the invention and shown it as applied to the manufacture of an article of only one shape, I am aware of the fact that the invention can be carried out in many other forms and applied to many other articles without departing from the scope of the invention as expressed in the claims. Therefore, I do not wish to be limited in these respects, but

What I do claim is 1. In a device for producing hollow articles from sheet metal blanks, the combination of a'die, a second die located adjacent ment with each other, both dies having passages therethrough, the passage in the first the being larger than the .passage in the second die and of difi'erent shape, a punch movable through, the passages in both dies, and means connected with the dies for centering them with respect'to each other.

3. In a device for producing hollow articles from sheet metal blanks, the combination of a reducing die having a passage therethroughof circular cross section and flared out at the entrance end, and a second die centered with respect tothe reducing die and provided with a passage smaller than the passage in the reducing die andof r the reducing die, means cooperating with.

1 inner die, and means for adjusting the innerpolygonal cross section and flaring out at the surface nearest the reducing die and formed at the surface of substantially the same shape as that of the passage through said dies for centering them with respect to each other, and a punch adapted to pass through the reducing die into the second die and having a cross section similar to the cross section of the passage through the second die. 7 r

4. In a device of thecharacter described, the combination of adie bed having a recess in its face, an inner die adapted to be received in said recess and provided with a passage therethrough, an outer die having a passage therethrough larger than the passage in the inner die and centered on said being seated at the bottom of the recess,

means for adjusting the last-named dies in 7 their respective recesses and securing them in adjusted positions, and aplunger blockhaving a series of punches in fixed position thereon, .one for each set of dies.

6. Ina device of the character described,

the combination of a die bed having a recess inits' face, an inner die adapted to be received in said recess andvprovided with a passage therethrough,an outer die having a passage therethrough and centered on'sald inner die, means for ad usting the nner die in said recess and securing it in adjusted; position, means for clamping the second 'die Y of d1es. v

in its adjusted position, the last named means being arranged to permit the outer die to move. while the inner die is being adjusted, and a punch movable through both I dles.

7. In a device of the character described,

the combination of a; die bed h'avinga plurality of recesses therein, a plurality of (lies arranged: in each recess, one dieof each set being seated at the bottom of the recess,

means'fo-r adjusting the last named diesin their respective recessesoand securing them in adjusted positions, a punch block having a series ofpunches in fixed position thereon, one for eachset of-dies, a plate for an outer die of each sethavingmeans for receiving and holding the outer die, and means for fastening it to the'die-bed, each of said :plates and its fastening means being ar ranged to'move with the inner .die while being adjusted.

8. In a device of the character described, the combinationof a diebed having a plurality of recesses in its face, finishing dies arranged movablyinsaid recesses, screws in said die bed for adjusting and holding the finishing dies in position 'in'the recesses, a punch block having a series of punches adapted to enter said finishing dies and center the same, a corresponding series of reducing dies, eachfinishing and reducing die having a central projection and depression fitting, each other, by which the reducing dies are centered with respect'to the finishing dies, a series of plates having perforations for receiving the reducing dies, and means relatively movable with respect 7 to said plates for clamping them in position after the dies are centered.

so f

9. In a device of the character described, j the combi'nation'of a die bed, an inner die provided with a passage therethrough, an

outer die having a passage therethrough and justing the inner die and securing it in adjusted position, means for clamping the second die in its adjusted position, the last 10. -The combination of die bed, a plurality of sets of dies arranged thereon,

and a punch movable centered on said inner die, means for admeans for adjusting the dies individually p' and securing them in adjusted positions, and v a plunger: block having a series of plungersin fixed position thereon, one for each set In testimony whereof I have hereunto set. my hand, in the presence of two subscribing witnesses. I j

j HJALMAR G. oARLsoN,

I Witnesses: I

, ALBERT E. FAY,

v C. FORREST WESSON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Batents, f i

i v Washington, D. Q.

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