SU567529A1 - Work bending die set - Google Patents

Description

(54) STAMP FOR FLEXIBLE DETAILS

This invention relates to sheet metal working, in particular to bending dies. Known stamps for bending parts such as staples with horizontal shelves have a stiff punch with shoulders, a rigid matrix and a spring-loaded ejector ij. At the end of the stroke, the punch clamps the shelves at the point of inflection, as a result of which the shape of the part is distorted after it leaves the die. Therefore, such parts have to be bent in two operations in two dies, which increases the laboriousness of the process, reduces the accuracy of manufacturing parts. Also known is a stamp for flexible parts of the type of staples with horizontal shelves containing a punch, a die and an ejector. In this case the punch is made movable, and the stamp is provided with slats mounted rotatably during the course of the punch for finalizing the profile of the part. However, the accuracy of manufacturing parts such as staples on such a stamp is low r2j. The aim of the invention is to improve the accuracy of the form of parts such as staples with horizontal shelves. To achieve this goal, the punch is made movable and spring-loaded relative to the top plate. The axes of the swivel strips are set from the lower end of the punch at a distance equal to the height of the part, and the distance from the upper planes of the slats to the lower plane of the upper plate is equal to the vertical course of the punch in this plate. Horizontal shelves are formed with the help of two pivot plates, which in an open stamp can be raised so that they form with the stamp axis, the DZ angle, and during the working stroke, when the punch reaches the lowest position and stops, the punch holder holds down for some time. These strips, under pressure of the punch holder, are rotated at a right angle to the axis Sh1-ampa. Thus, the punch, under the action of strong springs, first bends the vertical flanges and preliminarily bends the horizontal flanges, and at the end of the stroke the turn bars become

perpendicular to the axis of the stamp and give the details the final profile.

FIG. 1 shows a stamp, a general view; in fig. 2 is the same, view along arrow A in FIG. one; in fig. 3 - pivot plate; in fig. 4 - the sequence of the process of bending parts in the stamp.

In the shank 1 of the punch there is a threaded plug 2, which presses a strong spring 3. The shank sits in the upper plate of the punch 4 and rests on a hardened gasket 5. The movable punch 6 enters the punch holder 7. Two pivot strips 8 are attached, which are held in horizontal screws. 9. The ends of these screws are inserted into the holes made on the sides of the punch 6. The turn plates S are connected to the punch 6 by two cheeks 1O, which are attached to the punch by screws 11. At the bottom of the punch are Inonii ejector 12, the matrix 13 and so forth. parts (on chortezhe not shown).

The stamp works as follows. The workpiece, put on the matrix 13 and fixed on it in a known manner, for example using stencils (not shown). When lowering the upper part of the stacker, the punch 6 begins to bend the workpiece. By the time the ejector takes the lowest position, the workpiece takes the form shown in FIG. 4, a. The punch stops and the upper part of the punch continues to descend, while the wand holder 7 presses against the turn bars 8 and to the end of the stroke gives them the position shown in FIG. 4, b. During the return stroke, the slide is opened and the finished part is removed from it.

Claims (2)

1.G. A. Smirnova, Aleev and others. Cold stamping in instrument making. M., Mashgiz, 1963, p. 113. 2.A. N. Malov. Technology. Cold ag, stamping, Mechanical Engineering, 1969, Fig.94 p. 173. / J Vida, .g Fy