US1837524A - Diestock - Google Patents

Description

A. R. BRADEN Dec. 22, 1931.

DIESTOCK 2 Sheets-Sheet 1 Original Filed Jan. 7, 1928 Dec. 22, 1931. g} R DEN 1,837,524

DIESTOCK Original Filed Jan. 7, 1928 2 Sheets-Sheet 2 Patented Dec. 22, 1 931 UNITED STA rE S:

ALBERT a. BRAn N, or, ar;varnish. MAss oHusnris. AssI Non; minute m- CHINERY CORPORATION, gor rr'a'rnnson nnwjqnltsny, A1 cont nt on. on "NEW JERSEY Original application filed mu 7; ieaa sriainb. 245221."

E 1930. serial )ressure is a) lied durin 'the cuttin 'o era'- l p a: 2:

tion. In rolling the stock, the heat used. to condition the metal burns out the carbon over the surface, forming an outer layer'o'r' skin which cannot be properly tempered. Consequently, in nakingdies-itromthe strip, the decarbonized scalenear the putting-edge portion must be ground awayto expose the steel having the full carboncontent. On the other hand, the decarbonized portion is tough and resistive to pressure,-so it is desired-that the exterior of thestock toward the thicker edge, or all that need not be tempered, shall remain undisturbed to gain the benefit-eithe strength of this surface-layer; To maintain consistently the correct rela'tionof the ground and unground areas, with the usual practice followed inmanu'facture, is'extremely difficult. When the removal ofthe scale is done. in the strip the stock is not straight, but contains waves, which may sometimes be quite abrupt. The result of'suchchanges of direction is that, as theworkman guides' the strip before the grinding wheel,'thedepar ture of its side from astraight line ma cause the decarbonized skin to be taken 0 below the area to be tempered, even completely to the pressure-receiving edge,;- 0r opposite cur- ,vature of the stock may lead to the" removal of too little material, the decarbonizedf'surface remainingclose to the cutting portion. For the reasons already stated, theresulting die, in the first'instance, illfnot be as durable as it might, and, in the sec0nd,there will be soft spots in the cutting edge. It is an 'object of this invention to provide for the production of clicking dies which will have the full benefit of the strength of the decarbonized material Where this produces no harmful ef- D I L QK- "performs the double function" ward; the opposite or wider ed feet, yet will be substantially free from it where it will interfere 'with; the temperof theputtinged'gef i I a For the attainmentof thi'sjobjec tythisinvention provides die -stockf in awa'll is .1

formed with areas converging'toan apex to ana: ria this nitri c tion, tie-da a 7 provide a gage line, extending longitudi 'nallyof a' stripof the stockj between thec ut- "ting and pressure' recei-viiig"edges,"and, fur IilSlIIIIg a guide forthe' workmanLin-"theireinoval of material near-the cutting edge 'ortion; ;This ga e-line ma tie-provided y a projection from the stock substantially para-'- 'lel' t'ofthe opposite edges, to whi'cli projection the grinding or othermaterial renioving opme "It thus guideand giving abody 'ofmaterial-lwithin which there will be an opportunity fer 'CIe'anE ing thev area toibe tempered" without overrunn'ing upon the portion over which the retenition of the s'i'i'rface-strengthi's desired. "This increased thickness 1 at the" cutting edge *als'o strengthensit. I The projection is preferably i I angularbeing inclinedffroman apex we e cutting-edge portion warren saidapextd- Preferably,

this] angle is obtuse; render ng ithe stock easier tolroll than Whentherojection ifs sharper; VVhi1e -.no t always ne'cessary, the projection may beprovided uponjlboth 'sides of the stock, so there-lis' 'a double guiding means and body ofmaterialfw-ithin w-hicl' to Work safely. When buta 's ingle pro'jectionis employed," the opposite side of the strip is inclined gradually from the pressure-receiv ing portion to the 'cutting-edgeIportion.

- 5 improved die-stock and means for op}. I

panying drawings, which Fig. 1 is a perspectivevie'wwhich thestock'maybe rolled,

Fig.2 is a similar view of a grinding ap paratus for removing the decarboiiizedskinremoved from the exterior of the formed die; F 13 crating upon it are illustrated in -the accomafter it has been operated upon by thesaps Fig. 5, a view showing, in perspective, a grinding apparatus by which the die may be sharpened i v Fig. 6, a perspective view of die-stock hav-' ing prq'eetlons etrom its opposite sides ig. z-a -similar' view showing the stock paratus of Fig- 2; d r "Figis, a view corresponding to Fig "6,in which appears another formof my improved die-stoc A mill 'M, rolls 10,10, 0 ofthree are illustrated. ""These 'rolls, aiie adapted to produce, by steps successively per partially shown in Fig. 1, has which two of a vertical series termed, as by1seetions;,;12, 125; 1'3, 13 and 14,

31,4, upon-a heatedz-metal bar b, asstrip-of click-- ingdie stock. The roll-sections l2fgi-veto the barta pneliminary term, the sections 13 an 7 intermediate; iorm, randthe sections '14: the

final foam -1B. The-stock 5B,, shownxmost Ei ;.;"t3,,--h-as a cuttingwdge portion 7 j t c "GI1.ttiIIg.-Bdg of the clicking die istoflbepnoduced andatitsopposite edge 18 -thicker; portiomd, the which, inthe finished ,clie,c.utting pressureis-a plied. The opposite Side walls-hither strip 'verge'graduallytowardthe thiekedge-exoept that, near the out ting fidge; Portion; is g a proj ectiom in the one being shown, at each angular,- .having at its outer fs ide,,-two i -wa.l1s bne a e exten'din hm.; he;tl.rinedge;of the die =to an apex V I the other :wall 9 extending [ii-pm 1 the a; line h," 2 the wall g meets the normallyinclined wall on lot. the-strip.

thei-apex-line, f 2.81101 lineflh. rare {sub tantially parallel :to the ioppos'ite edges strip, .:The Walls 6 :and q form with each an =-obtuse angle approaching quite QlOSQlyTOlWdBgIBQ One neason why ,thisoltuSeang-le isimportant-is that; asthe wall am more nearlyperpenxlicular to r thetwellm, it-vbecomes increasingly ditficult to-froll thestock without c-ausing'the portion at? the: a x; f to be vlmoken :or :irrcgulaqthe depth -o fractures Ebeing. sometimes such \as, omakefthe stocknnsuitable' iorithe formatiion-ofetlfw cutting edge; 7 1 7 g In manut faoturing a dic fromtheistock B, the suriece; is removed from one sidei of the: strip-19:11.thezportion-c where The stud: :-is shown as :under the influence of raispring; 28, which thestrip' B is forced against the wheel and thdg'rinding relation may beiurthler varied by the. movement oi,

. shifting area may the slide 17 upon its base. As the operator 7 advances the stock, he watches the lower edge 11 (Fig. 7) of the bright area is, createdby the wheel 26 as. it removes the dark dee carbonized scat-1e, comparing its relation to the gage-l ine hot the stock-projection. If, on

account oflcurvature or other irregularities ofthe strip, there is a material departure ,of the edgez'} from the gage-line; the stock'is moved slightly toward or from thewheel e caused to comprehend the dec ar- ,bomzed portion. in, proximity to the cutting tiEIrbance-is avoided of the tough skin at m, near 'therpressuremeceiving edge cl, where its strength is desired, Itshouldhe noted par ti-cularly' that, since the grinding takes place within the projection furnished by theangnlar-w-ails-zeand g, and-sinceit is not neces- -.sary' ;to wholly-remove this projection to complete-file, clearing-ofiof the scale at the cutting-edge portion, there may be considerable variations in thegform of the strip, without caaising the-groundarea Jr; to overrun upon theiarea 'llhat -is,-there is in' the projeotion, beyond the normal taper-of the clickeingdie {-stock, a: body of material within which variations in'the depth of grinding 'may oecurwithontevil efi'ect.

the slide; In this Way, the ground 5 edge, 'and thus place this edge in condition for tempering, While at the same time, dis- Theeside otthe stock which has been 7 groundasujust described is to be at the i-nside-o'fthe die, and the edge at n is brought i into conformity with a templet T' (Fig. *3) 7 :byhending, aswith hand-tools, aided by such wa'Qdeviceas apress P having a fixed abutment and a movable-member 32. .Having been i fonmedto theoutline of the templet, the ends of the are welded together, giving the died)... I ,7 gThe decarbonized skin is now to lbe ire- .elean areaadjacent the cutting edge,-,as alfrearlydone a-t the inside while in strip-form. 1} :For. this purpose, a simple grinding 'apparatus Iii-maybe utilized, this having a tilting :tableB tosupport the die,.said tablebeing adjustable as to angle by a screw. 36. -With the'table,-an,abrasive wheel 38 co-opera-tes'.

In;thisgoperatiomwhen employing the stock Bihaving a projectionat both sides, the procedure-maybe similar to that describedin the preoeding-stepfand the result the same.

increasing or decreasing its pressure against the wheel 38,-as maybe necessary to remove the proper amount of material and bring the line i of the ground areain the correctrelamovedvatthe outside-of the die to produce the ':'The operator shifts the die upon the table, 1151? l tion to thegage-line h. It may beffound that, $.36

because'the' work operatedupon is in short lengths Without unexpected changes in form,

or when the workmen are skillful, it wi'll be 'imnecessary to employ the projection with its iga-galine at theoutside of the stock'. In 1 a 7 this case, the stock may take the form appearing at C in Fig. 8. One side, as that to be acted upon before forming, is as in the stock B of Fig. 6, while the other, at 0, has a gradual taper from the cutting-edge portion 0 to the pressure-receivingportion cl. This lat ter corresponds to the well-known cross-sectional outline of clicking-die stock.

Having been thus formed to the templet and prepared for tempering by the the removal of the decarbonized skin from bothsides, such tempering is effected in the customary manner and finally the die is sharpened, as by a grinding apparatus I, in which atable 40 supports the die and presents it to a wheel 42 rotatable about an inclined axis. This completes the more essential operations of die-production. After sharpening the die, its cutting edge is backed by agreater thickness of metal than in the usual form of die, because the added thickness between the sides of the stock along the line f is not all ground away. Increased strength at the utting edge istherefore obtained.

By employing the stock of this invention,

dies may be manufactured having a high degree of uniformity with respectto the ground area, fromwhich the decarbonized portion I has been completely removed for tempering the cutting edge, and the unground area, upon which sa d material is retained because of its strength. These results are posslble when -the workmen have no more than ordinary skill.

Having described my invention, what 'I claim as new and desire to secure by Letters Patent of the United States is:

1. Die-stock comprising a strip of material having at one edge a cutting-edge por tion and at the opposite edge apressure-receiving portion thicker than the cutting-edge portion, a wall of the strip being formed with areas converging to an apex to provide a gage-line extending along said strip between the cutting and pressure-receiving edges and substantially parallel thereto.

2. Die-stock comprising a strip of material having at one edge a cutting-edge portion tending along the strip near the cuttingedge portion and inclined from its apex to the narrow edge and from said apex to a line between the narrow and wider edges.

5. Die-stock comprising a strip of material having at one edge a cutting-edge portion and at the opposite edge a pressure-receiving portion thicker than the cutting-edge portion, there being projectionsv extending along opposite sides of the strip near the cutting-edge port-ion. 1 v

6. Die-stock comprising a strip of material having at one edge a cutting-edge portion and v at the opposite edge a pressure-receiving POP',

and at the opposite edge a pressure-recelving 7 portion thicker than the cuttingedge portion, there being a projection extending along the strip near the cutting-edge portion.

3. Die-stock comprising a strip of material having at one edge a cutting-edge portion and at the opposite edge a pressure-receiving portion thicker than the cutting-edge portion, there being a projection extending along the strip near the cutting-edge portion and having sides forming with each other an obtuse angle. 1 r

4. Die-stock comprising a strip of material having at one edge a cutting-edge portion 7 and at the opposite edge a pressure-receiving portion thicker than the cutting edge portion, there being an angular pro ection ex-

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