SU1412867A1 - Method of producing presswork articles - Google Patents

Abstract

The invention relates to the processing of metals by pressure, in particular to methods for the production of stamped articles. The purpose of the invention is to improve the quality of products and the expansion of their range. During ejection and final shaping, the semifinished product is initially subjected to a punch, moving it together with the semifinished product in the same direction with a speed less than the speed of the ejector. The removal of the punch from the semi-finished product is carried out immediately upon the end of the contacting of the peripheral side surface of the semi-finished product with the inner surface of the matrix, and then the extrusion of the product is completed. Prior to the retraction of the punch, they first act with a pusher on the central part of the semifinished product, carried out its final shaping, and on the peripheral part, pressing it to the punch, then - only on the peripheral part of the semi-finished product. In the extrusion process, a local punching of the individual peripheral elements of the product is carried out by local action of the ejector on the periphery of the semi-finished product. When using the method, it is possible to obtain parts of complex shape on equipment of lesser capacity while eliminating the forgings of forgings when pushing out. 2 h. the item of f-ly, 4 ill. from the next

Description

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The invention relates to the processing of metals by pressure and can be used in forging and stamping production in the manufacture of thick, mainly large-sized parts of complex shape, such as panels, spars, bottoms, impellers, including those with a central process.

The purpose of the invention is to improve the quality of products and the expansion of their product range for

the product cops are formed by free flow.

Due to the fact that the stamped semi-finished product is in contact with the punch until the peripheral part of the semi-finished product leaves the matrix, the semi-finished product is warped, which in the known method occurs due to the friction between the side surface of the semi-finished product and the internal surface of the de-embossing of the stamped matrix. In addition, the force of stamping parts of complex shape can be reduced by 1.5–2 times due to the fact that the forming process is divided into the following stages: preliminary stamping by force PI (Fig. 1) and final stamping by force of the ejector on the ejector side Rz from the side of the punch (Fig. 2 and 4).

when it is removed from the die, as well as by reducing the stamping force. FIG. Figure 1 shows the beginning and end of the filling of the working cavity of the matrix along the periphery with a partial decoration of the central part of the product; in fig. 2 - the beginning and the end of the first stage of ejection and final shaping with simultaneous upward movement of the ejector and the punch; in fig. 3 - retraction of the punch from the product and the second stage of ejection with the impact only on the periphery of the product; in fig. 4 shows an embodiment of the method in the step of pushing and final shaping with the local forging of the peripheral elements of the product by means of the pushing device.

performed as follows.

The punch 1 with speed V is moved towards the stationary ejector 2, consisting of a central ejector and lateral spring-loaded ejector. When this occurs, the filling of the working cavity of the matrix 3 on the periphery (Fig. 1). Then, the punch 1, not breaking away from the surface of the forging 4, is moved simultaneously with the pusher 2 in the opposite direction at a speed Vs, slower than the speed of movement of the Ejector of the pusher, pushing out the peripheral part and finally forming the central lower part of the forging 4. At the same time, the springs of the lateral ejector are compressed ( Fig. 2). After final completion of the forging 4, the ejector 2 is stopped, and the punch 1 is continued to move upwards (FIG. 3). Spring-loaded side ejectors hold the forging 4 in contact with the surface of the punch 1 until it is completely ejected from the central and peripheral parts of the die. After the final extrusion of the forging 4, when its side surface comes out of contact with the inner surface of the die, the punch 1 is retracted from the surface of the forging 4 and is removed from the die.

If the product has peripheral elements of the type of bosses, then the final shaping of the product when it is pushed out can be carried out in two stages (Fig. 4) —first stamp the central part of the product, and then the peripheral bosses. In this case, the protruding ele

the product cops are formed by free flow.

Due to the fact that the stamped semifinished product is in contact with the punch until the peripheral part of the semifinished product leaves the die, the semifinished product is prevented from wriggling, which occurs in the known method due to the friction between the side surface of the semifinished product and the inner surface of the die. In addition, the strain strain

The rolling of parts of complex shape can be reduced by 1.5–2 times due to the fact that the forming process is divided into the following stages: preliminary stamping by force PI (Fig. 1) and final stamping by the efforts of PZ from the side of the ejector and Pz from the side of the punch ( Fig. 2 and 4).

Example. The original billet of aluminum alloy AMgb (dimensions; 0 300 mm. Thickness 160 mm) is heated to 450 ° C.

The stamping is carried out on a special model K hydraulic press, 20.601 with a force of 1250/1250 tf. The original billet set in the matrix, heated to 450 ° C, and deformed punch. After the matrix engraving has been completed around the periphery, the pressure in the hydraulic system of the main plunger is dropped to zero, but does not tear the punch off the forging surface.

Then, the upper traverse of the press with the punch attached to it and the lower traverse of the press with the ejector move

up at different speeds. The speed of upward movement of the punch is less than the speed of movement of the ejector. When this occurs, the ejection and final clearance of the forging occur. After the final design of the forging and its exit from the working part of the die, the punch is retracted from the surface of the forging and removed from the die, moving the stretcher upwards.

The application of the proposed method allows to obtain details of complex shape on

equipment of lower power (1.5–2.0 times) and exclude warping of forgings when pushed out, which is of particular importance in isothermal stamping, when the metal of the stamped forgings is not and is in a state of high plasticity, therefore the forging can easily warp when pushed out.

Claims (3)

1. A method of manufacturing stamped products, including preliminary bulk stamping of the workpiece with a punch in the matrix, filling the working cavity of the matrix around the periphery, knocking the stamped semi-finished product from the matrix with a pusher while simultaneously forming the product by locally acting with a moving ejector on the semi-finished product and pulling the puan sleep from a semifinished product, characterized in that, in order to improve the quality of products and expand their product range, in the process of ejection and final shaping, first the semifinished product is affected by a punch, moving it together with the semifinished product in the same direction at a speed lower than the ejector movement speed, and the lead the punch from the semi-finished product is dried directly. A method according to Claim 1, characterized in that prior to removal of the punch, a pusher is first applied to the central part of the semi-finished product, its final shaping, and peripheral, pressing it against the punch, and then only the peripheral part of the semi-finished product. 3. The method according to claim 2, characterized in that in the extrusion process by local At the end of the contacting period of the impact with the ejector, on the periphery of the thinnest side surface of the semi-fabricated semi-finished product, the bulk kata-with the inner surface of the matrix, punching of individual peripheral elements, after which the product is extruded by the product's cops. 2. A method according to claim 1, characterized in that, prior to removal of the punch, the pusher is first exposed to the central part of the semi-finished product, its final shaping, and peripheral, pressing it against the punch, and then only the peripheral part of the semi-finished product.  7 four V2 2 fae.