RU1807904C - Die for bedding cramps from individual pieces - Google Patents

Abstract

Use: for the manufacture of bar staples. SUMMARY OF THE INVENTION: a stamp comprises a rigid matrix and cylindrical half-matrices (CPUs) located below it, as well as a forced rotation assembly of the CPU. The forced rotation unit of the CPU contains a stop fixed to the punch and cams placed against the stop at the ends of the CPU. Streams for blanks are made on the working surfaces of the punch, rigid matrix, and CPU. 7 ill., 1 tab.

Description

The invention relates to the processing of metals by pressure, in particular to cold forming equipment.

The aim of the invention is to expand technological capabilities while increasing reliability and simplifying the design of the stamp.

Fig. 1 (section AA) shows the proposed stamp / front view, on the right is the position of the bending punch after the U-shaped bending of the bracket in the arms of the bending punch / matrix and the right rotary cylindrical half-matrix for bending; on the left is the initial position of the left cylindrical half-matrix for bending at the moment of approaching the stop of the forced rotation: in Fig. 2 - stamp, top view, on the right - the lower half of the stamp without punch, stop and shank, on the left - the upper half of the stamp, general view; Fig. 3 is a view B of Fig. 2, the initial position of the rotary cylindrical half-matrices for folding and a plate securing them from axial movement; in Fig. 4, on the right, the bending punch at the moment of folding the right vertical shelf by an angle that compensates for the spring of the staple material; on the left is the emphasis of a forced rotation at the moment of rotation with its own copy surfaces of the left rotary half-matrix for bending the bending of the left shelf of the bracket; Fig. 5 is a cross-section BB of Fig. 4, on the left is the position of the retainer of the right half-matrix for folding the fastening plate, preventing axial movement of the right cylindrical half-matrix for folding; Fig. b shows elements of bending of circular metal, as explained in the table with minimum bending radii of metal of circular cross section; Fig.7 is a section of a bar in place of bending /

The stamp for bending parts such as brackets from piece blanks contains an upper half consisting of a bending punch 1 (Fig. 1) having working streams 2 made at the end and side surfaces 0.8 to 0.9 mm deep from the radius of the workpiece. The bending punch 1 at the time of folding of the vertical shelves acts as a bending mandrel, and therefore the working streams on the side surfaces are made with undercut 2 (Fig. 4). The bending punch 1 is rigidly connected by means of a pin 3 and two screws 4 with an emphasis of forced rotation 5

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(Fig. 5) with carbon surfaces 6 that rotate the half-matrices for bending 7, The stop of the forced rotation 5 together with the bending punch 1 is attached with screws 8 to the shank 9, which, in turn, is attached to the press slider (in Fig. .1 not shown). The angle of folding of the vertical shelves of the bracket is controlled by lowering the stop of the forced rotation 5 when setting up the press (Fig. 4). Rotary cylindrical half-matrix for folding 7 are located in the lower part of the stamp between the lower plate 10 and the matrix 11 with the possibility of rotation relative to their outer surfaces and folding the shelves of the bracket (Fig. 4) taking into account the spring angle. The rotary cylindrical half-matrices for folding are fixed in the initial position by means of ball clamps 12 (Fig. 1). An ejector 13 with a rubber buffer 14 is located in the bottom plate, which allows the parts to be ejected from the matrix 11. The matrix 11 and rotary cylindrical half-matrices for bending 7 surfaces facing the bending punch have reciprocal half-arms 15 to reduce distortion of the cross-section of the bar at the bending and bending places. With significant diameters of the workpiece, a bar, for example, with a diameter of 14 mm, with a bending radius of 10 mm can reduce the vertical size to 11.2 mm and increase (Fig. 6.7) the horizontal size to 16.8 mm. From axial movement, the rotary cylindrical half-matrix for bending 7 is fixed with the help of a strap 16, attached at the rear by bolts 17 to the lower plate 10 (Fig. 5). The original procurement. 19 is fixed in the matrix 11 with a stop 18 (Fig. 1).

The stamp works as follows.

When the press punch with the forced stop 5 fixed on it and the bending punch 1, arranged in steps, is in the upper position (see Fig. 1), the workpiece of the bracket 19, which is a bar with two threaded ends, is inserted into the stream 15 of the matrix 11 to stop 18 (see figure 2). When the press slider moves down, the bending punch 1, together with the forced rotation stop 5 set slightly higher than the bending punch 1, bends the workpiece into a U-shape (see Fig. 1), the outer size of the bracket is formed along the matrix 11, and the inner radius of the bracket - on the bending punch 1. With the further movement of the bending punch 1 together with the emphasis of the forced rotation, the latter produces 6 with its copy surfaces

rotation of two rotatable cylindrical half-matrices for folding relative to their outer surfaces, which carry out the folding of the flanges 2 of the bracket around the bending punch 1 taking into account the required spring angle, ensuring the parallelism of the flanges of the bracket required by the drawing (Fig. 4). The value of the spring angle is controlled by the course of the stop of the forced rotation 5 (lowering the slide) when setting up the press. When the press slider moves up, the forced rotation stop 5 turns the rotary cylindrical half-matrix for bending 7 to the initial position, which

5 is fixed with ball retainers 12, into the ejector 13 with the help of the buffer 14 pushes the finished bracket onto the surface of the matrix 11.

Thanks to the change in the bending scheme and

With the removal of parts, it became possible to manufacture half-handles at the end and sides of the bending punch-mandrel facing the die and rotary half-dies for bending. Bending punch with

5 working surfaces of the half-arm along with a bending matrix and rotary cylindrical half-matrices having mating half-arms on their surfaces significantly prevent distortion of the cross-section of the staple, because the staple bar in the places of bending and bending is clamped along the entire length into the half-arm of the bending punch, dies and rotatable cylindrical half dies for folding. Distortion of a section of a bracket in

5 the result of this is reduced to 14-0.7 instead; 14i ± L4vKOTOpoe possible in the absence; working streams on a punch-mandrel with a bending radius of 10 mm (tab., 6, 7),

Exercise bending in vertical

0 planes and the use of a forced rotation stop located behind a bending punch rigidly connected to it for bending the shelves allow transmitting significant bending and bending forces, not

5 left a dent in the details, making the stamp design compact and reliable in operation by eliminating wedges, rotary axes of rotation of the rotary cylinders and an adjustable stop taking into account the spring angle from the stamp design.

Claims (2)

The formula of the invention 1. A stamp for bending staples from piece blanks, comprising a bending matrix mounted on a fixed plate and 5 cylindrical semi-matrices for bending placed under it with a possibility of rotation, as well as a bending punch made with undercuts, characterized in that, in order to improve the quality of products, it is equipped with a unit for forced rotation of cylindrical semi-matrices made in the form rigidly connected with the punch of the stop, and cams placed on the ends of the respective half-matrices with the possibility of interaction with the stop. 2. A stamp according to claim 1, characterized in that the working surfaces of the punch, die and half-matrix are made with streams in the shape of the workpiece. Minimum bending radii of round metal (dimensions in mm) Note: the table is not given in full. (see. Anuryev V.I.Manufacturer of Mechanical Engineering Designer: VZ 3 t.T. 1 - 5th ed. revised and enlarged. - M.: Mechanical Engineering, 1978. - 728 p., ill. p. 404 tab. 50). -A-4 (putt