SU921658A1 - Cutters for cutting-off and sharpening blanks - Google Patents

Description

(3) KNIVES FOR CUTTING AND CUTTING

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The invention relates to the processing of materials by pressure, in particular to equipment and accessories for the manufacture of cutting edges on self-tapping screws.

Knives are known for cutting and sharpening blanks containing prismatic bodies with cutting edges l placed on their ends.

A disadvantage of the known technical solution is that its performance is small.

The closest in their technical essence are knives for cutting and sharpening blanks, mainly for self-tapping screws, containing prismatic bodies with cutting edges placed at their ends at an acute angle, and protrusions for bending and chipping burrs 2.

A disadvantage of the known technical solution is that its performance is low.

The purpose of the invention is to increase productivity by obtaining a cutting pen on the conical surface of the workpiece.

This goal is achieved by the fact that the known knives for cutting and sharpening blanks, mainly for self-tapping screws, containing prismatic bodies, with cutting edges at their ends at an acute angle, and protrusions for bending and splitting of burrs, have one knife placed at its end between the cutting edges. edges to sharpen the workpiece a molding ledge with a bevel and a cavity to form a semi-conical surface of the workpiece, and the beginning of each cutting edge for cutting the workpiece is located on one of the tops of the molds of a full-fledged protrusion, the two other peaks of which are located at the intersections of the bevel of the molding protrusion with the corresponding cutting edge: to sharpen the workpiece.

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and the second knife has a cavity for forming the semi-conical surface of the workpiece, placed between the edges for sharpening the workpiece, and the beginning of each cutting edge for cutting the workpiece is located at. the intersection of the cutting edges to sharpen the workpiece.

Figure 1 shows the knives, a general view; figure 2 is a view of And figure 1; figure 3 view B in figure 1; Figs, the working position of the knives at the time of forming the end of the workpiece; in Fig. 5, view B in Fig. 4; figure 6 section GGD figure 2; Fig.7 section dd in fig 3

i The knives 1 in the central part of their ends 2 are made in the form of cavities of half-cones 3 with cutting edges k forming a given shape of the end of the workpiece 5, and one of the knives 1 has a protrusion with a bevel 6 at the end of the workpiece 5, perpendicular to the end 2 at an angle to the axis of the half-cone 3. For pieces of the workpiece 5, the knives 1 have cutting edges 7,

Knives 1 work as follows.

When the knives 1 approach each other, the workpiece 5, located on their axis, is crimped to form its end in the form of a cone 3. The final formation of the cone 3 is formed by the cutting edges of the knives 1. A piece of a given length of the workpiece 5 is cut by a cutting edge 7,

When equipping the cutting machines with these knives, thanks to a combination of operations, the cost of manufacturing 1000 pcs. blanks reduced to six | time. This knife design significantly improves performance.

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devices intended for the manufacture of self-tapping screws

Claims (2)

1. The patent of the Federal Republic of Germany No. 214l513, cl, B 21 L 3/00, 1973. 2. USSR author's certificate W k & 032.k, cl. B 21 G 3/16, 1975. I /