SU604609A2 - Successive-action die set - Google Patents

Description

This knife is made with a sloping end, forming an acute angle with the surface of the stepping knife, carrying a cutting edge parallel to the direction of feed of the material.

FIG. 1 shows a diagram of low-waste punching on one half of the tape in the described chip; in fig. 2 - a part of a stamp, the scheme of KOTOiporo is given in FIG. 2, vertical section; Fig, 3 is the same horizontal cut; in fig. 4 - the lower part of the stepping knife stamp in an oblique-angular projection; in fig. 5 is given the scheme of low-waste clamping with a different execution of the step knife.

Low-waste stamping on the described stamp is carried out by a stepping knife, the width of which B is larger than the feed step T, for example, by (0.2-0.3) 7. The stamp contains a matrix 1, a stepping knife 2, which is simultaneously a punch, which forms part of the part contour, puller 3 and stepped support 4, preloaded by spring 5. The tension of the spring creates a screw plug 6 attached to a brace 7 attached to the puller 3 with screws 8. The working end 9 of the knife cuts a shaped section on the workpiece, and the protrusion 10 provides support to the knife during the separation of the material of the workpiece; the width of the protrusion 10 is equal to the feed pitch T of the tape. Surfaces And and 12 of the step knife 2 and the step support 4, interacting with each other, are made, beveled.

The stamp works as follows.

A blank (strip or strip (not shown)) is fed into the groove of the puller 3 up to the stop 4. When working, the jaw knife 2 lowers and its beveled section 11 approaches the bevel on the stop 4 and pushes it to the left. Then, the cutting edge of the stepping knife 2 separates from the workpiece a portion that forms a half of the contour of the part. When lifting the upper part of the stamp, the step emphasis 4 under the action of the spring 5 returns to its original position, and the tape moves one step up to the front plane of the step support 4. During the next stroke

The press process is repeated, and after each stroke, the elongated part of the stepping knife 2 cuts off a section of the belt by the length of the feed step.

Since the step stop is pressed a little earlier than the seam allowance is separated along the edge of the belt, the latter can shift at the time of material separation and the step size b) is broken. In order to avoid this, the working plane of the stepping knife can be made beveled in the direction of the punch axis, then the apex of the cutting edge of the knife 2 will begin the separation of the tape material before the schagovy stop is pulled out beyond the outer edge of the tape.

The same goal can be achieved if punched punches are in the stamp. They are given a length, somewhat longer than the length of the stepping knives, so that they penetrate the ribbon before the stepping knife departs.

FIG. Figure 5 shows a variant of the low-waste stamping of a rectangular-shaped part with beveled corners, which are formed by the triangular protrusion of the stepping knife. The rest of the perfect stamp design is similar to that described above.

The technical and economic effect created by this stamp is determined by improving the quality of parts, reducing labor intensity by eliminating additional operations to remove protrusions at the junction of the tape with the step support, and increasing the durability of the dies due to the more favorable shape of the stepping blades.

Claims (1)

Invention Formula .one. Stamp sequential action on aut. St. No. 570432, characterized in that facing each other to the surface of the step support and the step knife are made beveled and interacting with each other, and the step support is provided with a lever for returning it to its original position. e uz.S rig.Z