US1837523A

US1837523A - Art of making clicking dies

Info

Publication number: US1837523A
Application number: US245221A
Authority: US
Inventors: Albert R Braden
Original assignee: United Shoe Machinery Corp
Current assignee: United Shoe Machinery Corp
Priority date: 1928-01-07
Filing date: 1928-01-07
Publication date: 1931-12-22
Anticipated expiration: 1948-12-22

Description

Dec. 22, 1931. A. R. BRADEN 1,837,523

ART OF MAKING CLICKING DIES Filed Jan. 7, 1928 2 Sheets-Sheet l Dec. 22, 1931. A. R. BRADEN 1,337,523

ART OF MAKING CLICKING DIES Filed Jan. 7, 1928 2 Sheets-Sheet 2 Patented Dec. 22, 1931 onmnay coaroanrron, or Parnason,

" JERSEY J ART or MAKING Application filed January 7,

My invention relates to the making of clickingdies, such as are employed for cutting out parts of shoes, it involving a methodof producing these dies. The improved die-stock preferably employed in performing this method ismade the subject of a divisional apwhich cannot be properly tempered. Consequently, in making dies from the strip, the decarbonized scale near the cutting-edge portion must be ground away to expose the steel having the full carbon-content. Onthe other hand, the decarbonizedportion is toughand resistive to pressure, so it is desired that the exterior ofthe stock toward the thicker edge, or all that need not be tempered, shall remain undisturbed to gain the benefit of the strength i =VJhen the removal of the scale is done in the-T of this surface-layer. Tomaintain consistently the correct relation of the ground'and unground areas, with the usual practice followed inmanufacture, is extremely difiicult.

strip, the stock is not straight, but contains waves, which may sometimes bequite abrupt. The re'sultof such changes of directionis that,,as'the workmanguides the strip before,

7 the grinding wheel, the departure of itsside from a straightline may cause the decarbonized skin tonbe' taken off belowthe area to he,

upon are illustrated drawings, in which tempered, even completely to the pressure-receiving edge; or opposite curvature of; the:

7 stock may lead to the removal of too little material, the decarbonized surface remaining close to'the cutting portion. For the reasons already stated, the resulting die, in the first instance, will not be as durable as it might,

and, in the second, there will be soft spots in the cutting edge. It is an object of this in- I vention to provide for the production of click-, ing dies which will have the full benefit of;

.. ALBERT n. BBADEN," or BEVERLY, rarissrionosn'rrs, ASSIGNOR T UNITED SHOE MA- i j'f 831 I new teaser, a CORPORATION or NEW onetime nns ieaags mi in. 245,221.

the strengthof the, decarbonized material where thisproducesho harmful effectfyet I will be substantially free from it where'it will interfere withthe temper of the cutting ventionprovides, a method ofdie-making in which a-gage-line extending longitudinally V of a strip of'stock, furnishes a guide for the workman in the removal of material near the cutting-edge portion. The gage-line isprovidedby aunitaryrp'rojection from the stock,

.tdwhichthe' grinding or other material-re- 7. moving operation is substantially confined.

The projection 'thus performs the double bodyof material within which there willbe an opportunity for cleaning the area to be 7 tempered without'overrunning upon the porfunction of creating aguide and giving a completing the die from thefstock treated as just outlined, it may be bent to form with the surfacefromwhich the decarbonized material has been removed at the inside, and then such material removed from the opposite side. After this, it is tempered and sharpened by grinding the outside; With the strip. made up indie-form, the short lengths, changing in direction according to: some definite plan, are

.much easier to follow .infthe removal of the,

decarbonized skin than iii'th'e strip-formp lVhile notalways necessary, the" projection so there is a double guiding means and body of material within which to Work safely.

may be provided upon both sides of the stock,

Means for performing the steps offmy improved method andthe die-stock operated in the accompanying Fig. 1 is a perspectlve view of a mill by l which the stock may be rolled;

Fig. 2 is a similar view of a grinding apparatus for removing the decarbonized skin from one side of the strip of dle-stock;v

by which the decarbonized portion maybe For the attainment of-this object, this inof three are illustrated.

adapted, to. produce, by steps successively performed, as by sections 12,'12';'13, 13'; and.

' removed from the exterior of the formed die;

e Fig.8, a view corresponding 6, in

which appears another form of die-stock.

A mill M, partially shown in Fig. 1,'has

rolls

10, 10, of which two of a vertical series These rolls are .141, 14, upon a heated metal bar I), a strip of clicking-die stock. The roll-sections 12give to the bar a preliminary form, the sections 13 an intermediate form, and the sections 14 the final Ttormz B. The stock B, shown most clearly in Fig. 6,-hasf a portion 0, in which i the cutting edge of the clicking die is to be pro'ducechand at its opposite edge a thickerportion cl, towhich, in the finished die, cut:

ting pressure is applied. The opposite side walls ofthefstripdiverge gradually toward the thick edge, except that, near the cutting edge portion, there is a projection, in the present instance one being shown at each side. Each projection is angular, having, at its outer'side, two walls, one 6. extending from'the thin edge of the die to an apex f,

I andfthe other wall 9 extending from the apex toa line h, where the wall'g meets the nor- 'mally in'clinedwall m of the strip. Both the apex-line f and the line h are substantially parallel to the opposite edges ofthe strip. I The walls 6 and 9 form witheach other an i .obtuseangle approaching quite closely to 180 degrees. 'One reason why this obtuse angle is "important is that, as the wall 9 is made more nearly perpendicular to the wall m, it

becomes increasingly difficult to roll the stock without causing. the portionat the apex f to bebroken or irregular, the depth of the "apparatus H'may be uti-lized, this having a Q ..fra,ctures being sometimes such as to make the stock unsuitable for the formation of the 7 f cutting edge, sol

- In manufacturing a die from the stock B,

' thedecarbonized surfaceis removed from one side of the strip at'the portionc where the cutting edge 1s to be produced. A grindlng apparatus Gii'or this-purpose appears in Fig.

7 2. Upon a base 16is mounted a slide 17 hav-" ing, pivoted on it, a tilting table18, the angle of which may be varied by a screw 20. Studs 22 and 24, having their peripheries inclined oppositely to the wall of the strip, guide it to be ground as it is moved by the operator across an abrasive wheel 26. The stud 24.

"is shown as under the influence of a spring 28, by whichthe strip'B is forced against the wheel, andthe grinding relation may be further varied by the movement'ot the slide 17 without eviletlect.

upon its base As the operator advances the stock, he watches the lower edge 2' (Fig. 7) of the bright area it, created by the wheel 26 as it removes the dark decarbonized scale, comparing its relation to the gageline h of the stock-projection It, on account of curvature or other irregularities of the strip, there is a material departure from the edge 2' of they gage-line, the stock is moved slightly toward or from the wheel by shifting. the slide. In this way, the ground area-may be .causedfto comprehend the decarbonized portion in proximity to the cutting edge, and: thus place-this edge in condition for temper-- ing, while atithe sametime disturbance is avoid ed ct the tough skin at m,'near the pressure-receiving edged, where its strength is desired. "It should be noted, particularly that, since the grinding takes place within the projectionfurnished by the angular walls '@and g, and since it is not necessary to wholly remove this projectionto complete the 'clearing-o'fi'of the scale. at the cuttlng-edge portion, there may be considerable mm.

tions in the form of the strip, withoutcaus- .mg the ground area is to overrun upon the area 1%.

That is, there is in the projection,

beyond the normal taper of the clicking-die stock, a. body of materialwithin which'varia tions in the depth of grind ng mayoccur The side of the stock which has been ground as just described is to be at the inside of thedie, and the edge at n is brought into conformity with a templet T' (Fig. 3) by bending, aswith hand-tools, aided bysuch a device a. press P having a fixed abutment 30 and ainovable member '32. Having been formed to the outline of the templet, the ends of the piece are welded together, giving the die D. I l

moved at the outside ofthed-ie to produce the clean area adjacent the cutting edge, as already doneat the inside while in stripiorm, For'this purpose, a" simplegrinding tilting table 34 to support the die, saidtable abeing adjustable as to angle byascrew 36.

jlViththe table, an abrasive wheel 38 -co-op- [eratesg Inthis; operation, when'employing the stock Bhaving-a projection at both sides,

"Thedecarbonized skin is now to be re- 7 theqr'ooedure may besirnilar to that de scribedlinthe preceding-step, and the result.

the same.- The operator shifts the die upon sure against the Wheel 38, as may benecessary to remove the proper amount of material and bring the line i of the ground area upon is in short lengths without unexpectedchanges in form or when the workmen are skillful, it will be unnecessary to employthe projection with its gage-line at the outside the table, increasingor decreasing .itspresof thedecarbonized skin from both sides,

such tempering is effected in the customary manner, and finally the die is sharpened, as by a grinding apparatus I, in which a table 40 supports the die and presents it to a Wheel 42 rotatable about an inclined axis. This confined to the projection.

completes the more essential operations of:

die-production.

After sharpening the die, cutting edge is'backed by a greater thickness of metal than in the usual form of die, 1

because the added thickness between the sides of the stock along the line 7 is not all ground away. Increased strength at the cutting edge is therefore obtained j By employing the method of this invention, dies may be manufactured having a high degree of uniformity with respect to the ground area, from which the decarbonized portion has been completely removed for tempering the cutting edge, and the un ground area, upon which said material isretained because of its strength. These results are possible when the workmen have no more than ordinary skill.

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

1. The method of making clicking die from a strip of stock having a longitudinally extending projection furnishing a gage-line, which consists in grinding under the guidance of the gage-line material substantially name to this specification.

carbonized material from one side of the strip by grinding the projection, forming the strip to the outline of a clicking die with the surface from which the decarbonized material is removed at the inside, and grinding the outside. of thefdie, Y

,5. The method of making clinking dies,

which consist in rolling a strip ofdie-stock,

with'a projection extending'along the strip near the cutting-edge portion, grinding the projection toremove decarbonized material from one side of the cutting-edgeportion, bending the strip-to the form of a die with the ground portion at the inside, grinding" the outside'of the die to complete theremov'al' of decarbonized material from'the cuttingedge portion, and tempering and sharpening the cutting edge. I

5. The method of making clicking dies, which consist in rolling a strip of die-stock with a unitary projection along each side of therstrip substantially parallel to the cutting-edge portion, and removing stock for the production of the cutting edge, such material removedbeing substantially confined to the projections.

7 The method of m aking clicking dies.

from stock having a decarbonized coating which consists in forming a strip of die-stock with projections along opposite sides of the strip near the cutting-edge portion, grind- 7 ing one of the projections to remove decarbonized material at one side of the cuttingedge portion, bending thev strip to the form of a die with the ground portion at the inside, grinding the outer projection to complete the removalof theidecarbonized material from the cutting-edge portion, and tempering and sharpening the cutting edge. In testimony whereof I have signed my ALBERT, R. BRADEN.

2. The method of making clicking dies from a strip of stock having a longitudinally extending projection furnishing a gage-line, which consists in grinding under the guidance of the'gage-line material substantially confined to the projection, and forming the 7 ground strip to complete thedie.

a The method of making clicking dies,

gle project-ion at the side of the strip' thus operated upon.

.4; The method of making clicking dies from stock having a decarbonized coating, which consists in forming a strip of die-stock with a projection extending along the strip near the cutting-edge portion, removing de-