SU778867A1 - Die for bending clamps - Google Patents

Description

(54; STAMP FOR FLEXIBLE SCREWS

I

The invention relates to the processing of metals by pressure, in particular sheet metal forming.

A known stamp for the manufacture of staples with an internal undercut of one shelf, contains a spring-loaded punch, a matrix, a spring-loaded slider, mutually acting with a wedge 1.

However, this stamp contains a large number of wear parts.

The closest to the proposed is a stamp for bending staples containing a punch and semi-materials installed in the holder with wedge mechanisms for moving them 2.

However, staples with inward-curved ends cannot be obtained in this stamp.

The purpose of the invention is to obtain staples with inward-curved ends.

To achieve this goal, each wedge mechanism is made in the form of two circular pins, fixed in the holder at an angle to the stamp axis and placed in the grooves made in semi-matrixes.

FIG. 1 shows a stamp, a general view in section; in fig. 2 - section AA

FIG. one; in fig. 3 - the shape of the guide pins of the wedge mechanism (section BB in Fig. 1); in fig. 4 shows a section B-B in FIG. one.

The stamp comprises a punch 1 with a shoulder 5, fixedly fixed with a punch holder 2 on the top plate 3. A clip consisting of two walls 5 and two gaskets 6, connected by screws 1, is inserted into the slot of the bottom plate 4 by means of screws 8. In the cage, there are two semi-matrices 9, associated with wedge mechanisms, made in the form of fixed pins 10 of circular section, installed in the semicircular grooves of the holder at an angle of 30-

, 45 ° to the axis of the stamp and fixed from axial displacement with the help of shoulders, which are included in the grooves of the walls 5. Between the semi-matrices is placed an ejector 11 connected with two screws 12 with a buffer 13. The stamp is fastened to the press ram with the help of a shank 14. A stencil 15 is used to fix the blank.

The stamp works as follows. The workpiece is installed in the stencil 15 on the ejector 11. During the course of the slide

Press down the punch 1 first pre-bends the workpiece. The semi-matrices thus stand in place, resting against the ends of the gaskets 6. After the preliminary bending of the workpiece is made, the punch 1 with its shoulders begins to move the semi-matrices 9, which slide along the guide pins m 10, make a complex movement downward and toward the center and produce the final bending details. As the ram moves upward, the punch with its protrusions draws up the half-matrix 9, which, moving along the guide pins 10, returns to the initial position. Upon further raising of the punch 1, the semi-matrix 9 stands in place, since the ejector 11, which occupies the extreme upper position, prevents them from moving downwards.

The permanent connection of the semi-matrix with the wedge mechanisms and the initial contact with the spring-loaded ejector make it possible to exclude unreliable return springs from the design.

Performing the wedge mechanism in the form of two circular cross-sections, interacting with the guide grooves of the crawl. A lower pass / pin of the J-slips makes it possible to significantly simplify the design of the mechanism, making it more adaptable, since the circular cross-sections are easy to make and the guide holes are easy. .

Claims (2)

1.Mesterin V.T. Listova stamping. tlas schemes) GM: Mechanical Engineering, 1975, with. 92, fig. 217. 2. In the same place 90, fig. 207.  no ayffHue