SU749502A1 - Punching die stripper - Google Patents

Description

(54) DETACHABLE STAMP REMOVER

one

The invention relates to a tooling for cold plate forming and can be used in mechanical engineering.

In the manufacture of cutting dies, especially carbide, much attention is paid to the uniformity of the gaps between the punches and the die, as one of the factors affecting the durability of the stamp. For this purpose, the direction of punches relative to a die has recently been widely applied with the aid of pullers. YU

One of the main requirements of such a solution is a strict fitting of the contour in the puller by punches or vice versa, the punches by puller. The size of the gap between them should not exceed a quarter of the gap between the punch and the die. The particular importance of the identity of the contours in the puller and on the punch and the size of the gaps between them is given when using the puller as a copier 20 for the electric-discharge cutting of the matrix. Deviation from these requirements leads to increased and uneven gaps between the punches and the die.

The known structure of the puller, which is a plate with holes for the punches 1. The holes are treated by known methods with final plumbing.

The disadvantage of this design is the great complexity of achieving equidistance of the contours in the puller and on the punch, their coordinate location, as well as the necessary purity and perpendicularity of the contour walls in the puller relative to its mirror.

In addition to the laboriousness of processing, these operations are accompanied by a large loss of time for dimensional control. The complexity of making whole slices increases with the application of their preliminary heat treatment.

Claims (3)

A puller is known in which the contours for punches are obtained by pouring them with fusible alloys, epoxy and other compounds 2. These pullers are simple to manufacture and can be successfully used in dies with a strict central load and in dies for cutting down a small number of parts. The disadvantages of these pullers is that they are not sufficiently wear-resistant, not. can be used for high-speed stamping and dies with possible eccentric load. In addition, embedded pullers may not always be used as a copier for cutting the matrix. Known, for example, the puller holes for punches, which are formed using pressed-in liners, pre-heat treated to the desired hardness. Such a design and method for producing a puller considerably simplifies the process of fitting the working circuit in the puller with punches, which makes it possible to increase their durability. 1-11. The remnant of this puller design is. that during its manufacture, it is necessary to thoroughly process the holes in the sheeting under the inserts, and when pressing in the inserts, deviations from the desired shape for the punches and from the required perpendicularity of the walls of the aperture relative to the puller mirror are possible. A punch cutting puller is known, comprising a body and inserts forming a guide punch hole having stepped ends and interconnected 3. In a known puller, inserts are interconnected by means of locks which are formed by projections on the same inserts and corresponding slots on the connectors. loose inserts. The interface planes of the liners are perpendicular to the puller mirror. The presence of locks in a known puller requires strict dimensioning of the liners and punches size, which complicates and increases the laboriousness of manufacturing the puller. In the described puller, to simplify its manufacture, the ends of the inserts are made with horizontal platforms, the ases are coupled along these platforms. And the distance between the horizontal platforms of each insert is smaller than the corresponding punch size. The puller is shown in the drawing. FIG. 1 - plan view of the puller, assembled with a punch; in fig. 2 - section AA; in fig. 3 - section BB. The puller consists of body 1 and liners 2, 3, 4 and 5, which are pressed to the punch 6 and secured in the body 1 by means of epoxy compound 7. The window in the body 1 of the puller under the insert is made taking into account the overall dimensions of the inserts and the gap for casting with compounds. Each liner is made on a specific site on the punch. The liners have stepped ends and are interconnected. The non-working ends of the liners 2, 3, 4, 5 have horizontal sections 8 in which they mate with each other, and the insert length between horizontal sections 8 at the non-working ends is smaller than the size of the corresponding section of the punch. The described puller can be successfully used in the manufacture of cutting chips, where pullers are used as copiers for electric-discharge cutting of dies, since the puller described meets the following requirements for copiers; possesses conductivity around the perimeter and the contour under the punch in it is identical to the contour of the punch. Claims A die punch, comprising a housing, and inserts, forming a pilot punch hole, having stepped ends and mating with each other, characterized in that, in order to simplify its manufacture, the tips of the liners are made with horizontal platforms, the inserts are mated pads, and the distance between the horizontal pads of each liner is less than the corresponding punch size. Sources of information taken into account in the examination. Romanovskiy V.P. Reference book on cold shtampovke. Engineering 1965, p. 581, tab. 245. 2. Romanovsky VP and others. Consistent stamping in the tape. ML, 1962, p. 28, FIG. 13, a. 3. PTM 112-63 Stamps for cold stamping equipped with hard alloys, ed. Standards, 1964, p. 52, FIG. 73 (prototype). 46 r T r -2 FIG. 1