US1294990A - Die for trimming blanks. - Google Patents

Description

R. L. WILCOX.

DIE FOR TRIMMING BLANKS.

APPLICATION FILED JULY 12.1918.

L29%99Um Patented Feb. 18, 1919.

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Specification of Letters Patent.

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To all whom it may concern."

Be it known that T, RICHARD Lnsrnn WIL- 001:, a citizen of the United States, and a resident of Waterbury, county of New Haven, State of Connecticut, have invented certain new and useful Improvements in Dies for Trimmin lBlanks, of which the following is a specification.

My present invention relates to unprovements in dies for giving a trimmed crosssection to a blank as is done, for instance, in forming the square, hexagonal or octagonal shapes of bolt heads, nuts, and the like, or a many sided shape of any kind such, for instance, as a circular section with flat s des as is formed on shackle bolts and the like. it will be understood that by polygon or polygonal I mean any such. shape. blank may also be cut so as to have a c1rcular section.

One of the objects of my invent1on,a mong others, is to produce a die which Wlll be easy to construct and at the same time easy to sharpen in a simple manner. Another object of my invention is to produce such a die which will be capable of adjustment.

Tn the accompanying drawings Figure 1 represents inperspective an illustrative form embodying my invention;

Fig. 2 is a cross-section in elevation through the die illustrated in Fig. 1 taken on the line 2--2;

Fig. 3 is a plan vieW of a modification, in which some of the parts are adjustable.

The corresponding parts are referred to both in the drawings and in the specification by similar reference characters.

Referring to Figs. 1 and 2, the form of die here illustrated is of the solid type, being made of a single piece of metal. Extending through the die from top to bottom is an opening 10 which, in this particular instance, is such that its cross-section is an equilateral hexagon. The top surface 11 of the die is preferably turned conically and the intersection of this conical surface with the edges of the opening 10 produces cuttin edges.

11 some cases it is desirable that the cutting edges be shaped in such a way that the article to be trimmed will be out angularly as the die and the article move relatively to each other along the axis of the opening 10. This is accomplished by making some of the cutting edges so that one point of such edge is higher above the base of the die than another. Such an arrangement is provided 1n my copendmg applications, Nos. 219,170 and 219,172, each filed February 26, 1918, but have found that angular cutting edges of this type may be more readily produced by providmg around the top surface of the die a series of substantially flat surfaces 12 which make acute angles with the axis of the opening 10, and preferably With the surfaces arranged so that they are in edect the sides of a pyramid, in which case each surface will form a right angle with the plane passing through the axis of the open ing 10 and through the center line of the surface. With the cutting edges formed by such surfaces the die may be readily sharpened by passing a grinding wheel across these substantially flat surfaces.

The angular cutting edges may be formed in several ways by the surfaces 12. Tfthe opening 10 is circular in cross-section, then obviously the spacing of the surfaces 12 around the opening 10 is more or less immaterial, although it is preferable that they be so arranged that they join each other at the edge o-fthe opening. By so doing all parts of the cuttin periphery of the open in will have a direction angular to the axis of the die. "When the opening is polygonal in cross-section, T preferably arrange the surfaces 12 so that two adjacent cutting edges will form an angle at their intersection. In this way, one of such pair of cutting edges will throw its chip to one side of the axis of the die while the other edge will throw its chip in the op osite direction, This may be accomplished b of the apexes or angles of the polygon.

When the opening 10 is an equilateral polygon, such as the cross-section of the usual square or hexagonal bolt head or nut, the preferable form of angular cutting edges may be provided by arranging the surfaces 12 as shown in Fig. 1; that is, with the surrface broad enough at its intersection with the periphery to include two sides of the hexagon and with the surfaces 12 meeting each other at the apexes or angles of the hexagon. An inspection of Fig. 1 will show that each of the cutting edges thus formed tit til

y forming the surfaces 12 so that each will contain one Win tilt" will have an angular approach to the article joining each other between the apexes or angles of the polygon. Thus, in the die I shown in Fig. 1, wlth the equilateral hexagonal o ening. 10, surfaces could be provlded, eac with one of the angles of the hexagon lying between the outer limits thereof and such surfaces Joining each other mldway, for instance, one of the sides of the hexagon.

It will be understood that, while preferably I make the surface 11 conical, which facilitates its manufacture, this top surface 11 may be almost any shape, because obviously it performs no function in the cutting operation. It might readily, therefore,

be, for instance, at right angles to the axis of, the die, in which case the surfaces 12 would be out below the level of the top. surface of the die.

For man purposes, and particularly when used in connection with the method illustrated in my copending application No. 219,170, it is desirable that the opening 10 shall extend completely through the die, although for many purposes this is not necessary.

For some purposes, it is desirable to provide a die with independent cutting edges, such as shown in Fig. 3 which, as will be understood, is precisely the same as illustrated in Figs. 1 and 2, except that the cutting edges are formed on separate pieces of steel 1 1,which in the form illustrated in Fig. 3 are shaped as the 'frustums of pyramids, the tops of which form the sides of the opening 15 and the bases contact with a hexagonal opening. in the body member 16. The members 1 1 are held in place by screws 17. The arrangement thus described is similar to that of the copending application of cisely the same, except that in Fig. 3 the die is made in parts so that the cutting edges are located on separate members instead of on the solid die. All of the modifications heretofore suggested as to the form shown in Fig. 1 apply equally Well to the form shown in Fig. 3. I

surfaces forming a right angle with the plane passed through the axis of the opening it nd intersecting the surface at its center 2. A die having an opening therein and a plurality of substantially fiat surfaces on the top face of the die,-the planes of such surfaces making acute angles with the axis of the opening and intersecting the edges of the opening to form a series of cutting edges in the periphery thereof,- the surfaces meeting each other at the periphery of the opening, each of the surfaces forming a right angle with the plane passed through the axis of the opening and intersecting the surface at its center line.

3. Adie having an opening therein and the top face of the die sloping away from the periphery of the opening, and a plurality of substantially fiat surfaces on the top face with their planes making acute angles with the axis of the opening and intersecting the edges of the opening to form a serles of cutting edges in the periphery thereof.

4. A die having an opening therein and the top face of the die sloping away from the periphery of the opening, and a plurality of substantially fiat surfaces on the top face' with their planes making acute angles with the axis of the opening and intersecting the edges 'of the opening to forma series of cutting edges in the periphery thereof, the saidsurfaces meeting each other at the periphery of the opening.

5. A die having a polygonal opening therein and a plurality of substantially flat faces on the top face of the die, the plane of each of such faces making an acute angle with the axis of the opening, and

the plane of each of such faces making an acute angle with the axis of the opening and extending across two of the sides 0 the polygonal opening where said faces intersects the opening, to form a series of cutting edges around the periphery of the opening.

7. A die having a conical top face and an' equilateral polygonal opening therein and a 1% weaned Jew plurality of substantially flat faces on the top face of the die, the plane of each of such faces makin an acute angle With the axis of the opening, and extending across two of the sides of the polygonal opening where suchlfaces intersects the opemng, to form a series of cutting edges around the periphery of the opening.

8. A die comprising a body member and a plurality ofcutting members held therein,

each of the members having a cutting edge and the members being constructed and arranged and held in the body member so as to form a polygonal opening therein, With the cutting edges forming the periphery of the opening, the die being provided with a plurality of substantially flat surfaces making acute angles with the axis of the opening and intersecting the opening at the cutting edges, With the cutting edges lying in the said surfaces.

' RICHARD LESTER WILCOX.

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