RU2119400C1 - Method for making parts such as saddle-like washers and combination progressive die set for performing the same - Google Patents

Abstract

FIELD: machine engineering industry branches, namely manufacture of parts used for fastening railway road sleepers. SUBSTANCE: parts are successively formed in the same die set. At first strip is punched, then it is moved until stopper and cut and simultaneously next groove is punched. When strip is fed by one stroke next groove is punched, blank is cut and bent in four angles. Formed part is automatically removed out of forming zone at strip feeding. Novelty is spring-loaded support tapered along its upper surface. Knocking out member is arranged in die cavity and it is joined by means of tie rods with upper plate. EFFECT: reliable removal of formed parts without additional strippers and manual operations. 3 cl, 5 dwg

Description

 The invention relates to cold metal forming and is intended for use in the engineering industry in the manufacture of parts used, in particular, for fastening railway sleepers.

 Known designs of combined bending dies and methods for manufacturing parts 1, 2], which perform punching, cutting and bending.

 Known stamp [3], containing on the top plate of the cutting and punch punches mounted on the bottom plate of the punch and cutting matrix and a spring-loaded ejector located in the cavity of the cutting matrix, as well as a bending punch and bending matrix in the cavity of which the ejector of the finished part is installed.

 The method implemented in the well-known stamp, contains the following sequence of operations: when using a step feed, punching and cutting of the workpiece is carried out, then bending and removal of the finished part.

 The essence of the proposed development in the field of the method lies in the fact that the supply of the workpiece is carried out using the stops: one-time, preliminary, final and combining the following operations: segments of the first workpiece and punching of the next groove in the strip and simultaneous bending of the first workpiece, segments of the second and punching of the next groove in strip.

 The difference between the claimed stamp and the known one consists in performing preliminary emphasis on a bending matrix fixed on the lower plate and performing a bevel on the upper working surface, a spring-loaded support of a certain size, and also in that the bending punch is fixed on the upper plate, and the ejector of the finished part is connected by rods with top plate with the possibility of vertical movement.

 In FIG. 1 shows a general view of a stamp; FIG. 2 - section aa; figure 3 - the position of the workpiece on a spring-loaded support: a) in the initial state is indicated by a solid line, b) after the segments - a dashed line; figure 4 - stamped part; 5 is a position bending in the open position of the stamp. Legend: 1 strip, 2 lower plates, 3 upper plates, 4 combined dies, 5 bending dies, 6 punch punches, 7 cutting punch, 9 spring-loaded bearings, 8 bending punches, 10 posts, 11 ejector, 12 stops, 13 preliminary stops 14, one-time stop, 15 pad, 16 thrust, 17 intermediate workpiece, 18 stamped part.

 Combined sequential stamp for the manufacture of parts such as saddle washers contains the lower 2 and upper 3 plates. A punch 6, a cutting punch 6 and a bending punch 8 are installed on the top plate 3. A combined matrix 4 is installed on the bottom plate 2, which simultaneously punchs the groove and the piece of the workpiece, the spring-loaded support 9, the bending matrix 5, the support 12. The spring-loaded support 9 is installed between the combined 44 and bending 5 matrices and spring-loaded to the bottom plate 2 of the stamp. Part of the upper surface of the spring-loaded support 9 is made at an angle α (Fig. 3) to the horizontal surface of the stamp toward the beginning of the stamp. The bevel of the upper left part of the working surface of the spring-loaded support begins at least from the middle of the length of the cut workpiece from the cutting plane. The value of the angle of the bevel should ensure the position of the lower right edge of the intermediate billet 17 in working condition at a distance h from the upper plane of the preliminary stop 13 (figure 3).

 The execution of the upper left part of the surface of the spring-loaded support 9 at an angle ensures the free passage of the intermediate billet 17 through the preliminary stop 13 when moving the intermediate billet 17 to the bending position of the stamp by acting on the left end of the intermediate billet 17 with the original strip 1.

 The preliminary emphasis 13, made in the bending matrix 5 restricts the movement of the strip 1. The bending punch 8 is equipped with an overlay 15, the thickness of which allows the dimensions of the molded parts to be adjusted in the vertical and horizontal directions without removing the entire punch. The vertical size of the ejector 11 in conjunction with the pad 15 provides for the adjustment of the dimensions of the parts and, accordingly, affects their accuracy. The thrust surface of the additional stop 14 is located in the plane of the pieces of the workpiece. The emphasis is involved in the work only when punching the groove of the first workpiece of each strip when the stamp is put into operation. The emphasis 12 has a width smaller than the width of the groove of the part, which ensures the free passage of the part through it when removing it from the stamp zone after performing the bending operation.

 The ejector 11 is located in the cavity of the bending matrix 5 and is connected by rods 16 with the bending punch 8 with the possibility of vertical movement relative to the upper plate 3. In the initial position, the upper surface of the ejector 11 is located at the level of the upper surface of the bending matrix 5 (Fig. 5), and in the working position leans on the bottom plate 2 of the stamp and performs the function of the lower part of the bending matrix (figure 2). When lifting the upper plate 3 of the stamp due to more tight fixation of the stamped part in the bending matrix 5, the part is removed from the bending punch 8 and with the further course of the upper plate 3 is pushed to the surface of the bending matrix 5 and removed from the zone of the stamp. The removal of the part is carried out in the direction of movement of the strip 1 with the upper plate 3 of the stamp raised up.

 The principle of operation of the device: the initial strip 1 (figure 1), the width of which is equal to the width of the stamped part, is fed to a single stop 14. When the upper plate 3 of the stamp moves down, the groove is punched in the strip by the punched punch 6 along the combined matrix 4. Then the single stop is removed . For the second and subsequent strokes of the punch, the strip 1 is fed to the preliminary stop 13 and occupies the initial horizontal position (shown in Fig. 3 by a solid line).

 In the second step, the first workpiece is cut along the right working surface of the combined matrix 4 and the groove is punched in the subsequent workpiece by the punched punch 6. After lifting the top plate 3, the cut off intermediate workpiece 17 is located on the spring-loaded support 9 and occupies an angular position (Fig. 3 is shown by a dotted line ), and the right lower edge of the intermediate workpiece protrudes above the upper plane of the preliminary stop 13 by a value of h.

 Then, the strip 1 is fed one step and freely moves the intermediate workpiece 17 through the preliminary emphasis 13 to the bending position.

 In the third and each subsequent stroke of the upper plate 3, the next groove in the strip is punched, a piece of the workpiece is bent and bent in the bending matrix 5 with a punch 8 with an overlay 15.

 When lifting the upper plate 3, the stamped part 18 is pushed out of the bending matrix 5 by the ejector 11, and in the upper position of the plate 3, the upper plane of the ejector 11 coincides with the upper plane of the bending matrix 5 (Fig. 5), which ensures that the strip 1 passes through the intermediate the blank 17 of the stamped part 18 from the bending matrix 5 in the direction of travel of the working strip 1. In this case, the stop 12 does not prevent the removal of the stamped part, because its width is less than the width of the groove in the part.

 Achieving a positive result from the implementation of the invention is due to the fact that the design of the stamp is simplified, the manufacturing time of the part is reduced, the parts are stamped for a minimum number of positions.

 Literature.

 1. Zubtsov M.E. Sheet stamping. -L .: Mechanical engineering, p. 344-345.

 2. Romanovsky V.P. Handbook of cold stamping. -L.: Mechanical Engineering, 1979, p. 353-358.

 3. A.S. 1143494, B.I. 9 dated 03/07/1985 (prototype).

Claims (3)

 1. A method of manufacturing parts such as a saddle washer, including punching, cutting, bending followed by removal of the part from the stamp, characterized in that the strip is fed all the way, the groove is punched, the strip is moved to the next stop, the first workpiece is cut and the next groove is punched into strip, then advance the workpiece to the next stop and simultaneously bend the first workpiece, cut the second and punch another groove in the strip.  2. A combined stamp of sequential action containing cutting and punch punches fixed to the upper plate, a combined matrix and a spring-loaded support mounted on the lower plate, as well as a bending punch and a bending matrix, in the cavity of which there is an ejector, characterized in that the bending matrix is fixed a preliminary stop is made on the bottom plate, and a bevel is made on the upper working surface of the spring-loaded support, the value of which ensures the excess of the lower right edge of the workpiece above said preliminary emphasis.  3. The stamp according to claim 2, characterized in that the ejector is connected by rods to the top plate with the possibility of vertical movement.

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