RU2011467C1 - Die set for multipiece forging - Google Patents

Abstract

FIELD: metal pressure forming. SUBSTANCE: die set has upper and lower plates with preliminary and final grooves. A blank, had been deformed in the preliminary grooves, is being deformed in the final grooves, whose separate cavities are made with successive alternation in the upper and the lower plates. Generatrix of lateral surfaces of adjacent cavities of the final groove, laid in a common symmetry plane, normal to the die connection line, are displaced one relative to another by a distance no more, than a width of a fin pass jump. Each separate cavity of the final groove on the connection surface is displaced to the opposite half of the die by a distance, equal to a half-width of the fin pass jump. EFFECT: enhanced efficiency. 1 cl, 2 dwg

Description

 The invention relates to the processing of metals by pressure, and in particular to the design of dies for multi-piece die forging, will find application in the forging and stamping shops of engineering and metallurgical plants in the mass and large-scale production of forgings.

Known stamp for stamping forgings, containing the upper and lower plates with engravings on facing one another surfaces, as well as at least one intermediate plate with engravings on the upper and lower surfaces, in which the engravings of the intermediate plate are made deployed one relative to another at an angle of 180 ^about [1] .

 In the known stamp, both identical and different forgings in shape can be stamped simultaneously. The number of simultaneously stamped forgings is determined by the number of intermediate plates. Two forgings can be stamped with one plate, three forgings with two plates, etc.

 The disadvantage of this design of the stamp is the presence of metal waste in the form of a burr along the entire perimeter of the resulting forgings, the weight of which is 25% of the weight of the forgings.

 Another disadvantage of the known stamp is the low productivity of the manufacture of forgings. This is due to the fact that the blanks are individually placed in engravings of streams before stamping and are also individually removed from the cavities of the stamp after stamping.

 Closest to the invention in terms of technical nature and the achieved effect is a stamp for multi-piece volumetric stamping [2], containing the upper and lower plates with engraving blanks and final streams made on their facing each other, with an even number of plates made on each plate stamping streams forming identical streams in pairs, each of the streams of the pair is located at the same distance from opposite sides from the axis of symmetry of the stamp, and the full cavity of the engraving of each stream formed by half cavities made in each of the plates of the stamp.

 When the stamp is used to eliminate eccentric loads, the billets are deformed simultaneously in streams forming one pair: first, in the pair of extreme billet creeks and a pair of central rough creeks, pre-deformation of the billets is performed sequentially, after which they are stacked in a pair of final streams and final stamping is performed.

 A disadvantage of the known stamp is the high consumption of metal and the formation of burrs along the entire perimeter of each forging and jumpers between the forgings; low productivity of the stamping process, due to the fact that when the streams work in pairs, the auxiliary time for re-laying from the stream to the stream of two blanks increases; limited technological capabilities of the stamp, due to the dependence of the wall thickness between the cavities of the streams on the dimensions of the stamped forgings.

 The technical result is expressed in the reduction of metal consumption and time for re-laying of blanks from a stream to a stream.

 This is achieved by the fact that the individual cavities of the final stream are made with sequential alternation through one on the upper and lower plates of the stamp.

 The generatrices of the lateral surfaces of adjacent cavities of the final stream, lying in a common plane of symmetry perpendicular to the die connector, are offset from one another by a distance not exceeding the width of the bridge of the groove groove.

 Each individual cavity of the final stream along the surface of the connector at half the thickness of the bridge groove grooves is made in the opposite half of the stamp.

 In FIG. 1 shows a lower die plate, Alan; in FIG. 2 is a section AA in FIG. 1.

 The stamp for multi-piece stamping contains the upper 1 and lower 2 plates, on the facing surfaces of each other engravings of the blank 3 and the final 4 stamping streams are made. The engraving of the final stream 4 is formed by individual cavities 5, 6 and 7 according to the number of simultaneously stamped products (the number of simultaneously stamped products may vary depending on the dimensions of the stamp and the power of the stamping equipment). The cavities 5, 6 and 7 of the engraving of the final stream 4 are intended for the final shaping of each stamped product and are located sequentially in the upper 1 and lower 2 plates of the stamp. The cavities 5, 6 and 7 are made spaced apart from each other at a distance not exceeding the width of the bridge of the grooved groove. Adjacent cavities of the final stream of the upper 1 and lower 2 plates are interconnected by a jumper 8, which is formed by the bridge 9 of the burr groove 10, made common to all cavities 5, 6 and 7 of the final stream.

 The stamp works as follows.

 The initial workpiece, designed for stamping several products (in the shown example, three products) is pre-deformed during the oncoming movement of the upper and lower plates in the procurement stream. After this, the profiled workpiece is placed in the final stream 4. During the course of the upper stamp plate down or by successive strokes of the workpiece, the final shaping of the product in the cavity takes place. The metal of the profiled workpiece with the edges of the cavities 5, 6 and 7 is cut off to the volumes necessary to fill these cavities, connected by jumpers 8, equal in height to the thickness of the bridge 9 of the groove groove 10, common to all cavities of the final stream. With the complete closure of the upper 1 and lower 2 plates of the stamp, the metal of the billet is filled in the cavities 5, 6 and 7 and the jumpers 8 between them, while the excess metal is displaced into the groove groove 10 through the bridge 9.

 The size of the jumpers 8 between adjacent cavities of the final stream is taken constructively depending on the shape, size of the forging and the location of adjacent cavities relative to each other.

 When stamping forgings arranged in a row one after another (as in the above example), a jumper equal to the thickness of the end burr formed when cutting a separate forgings from a common burl is sufficient. The burr formed when cutting the forgings from the common burr remains on the bridge and when cutting the next forgings, the burr from the previous forging is removed along with the bridge.

 To increase the durability of the stamp, the size of the jumper can be selected in large sizes, but the implementation of the stamp with jumpers between the individual cavities is larger than the width of the bridge of the grooved groove and has no effect in comparison with the known stamps for multi-piece stamping with in-line arrangement of cavities without alternation in the upper and lower halves of the stamp.

 When stamping in the proposed stamp for multi-piece stamping, the quality of the forgings is increased in comparison with the prototype, since the end burr formed when cutting individual forgings from the common area is removed together with the jumper. The range of forgings obtained in the die of the proposed design is expanding, since the presence of a mechanical pressed-in burr due to inaccuracy in the manufacture of forging and trimming dies is excluded. In addition, the resistance of the stamp is increased, since the proposed stamp has a jumper between the individual cavities, the width of which can be within the width of the bridge grooved grooves.

 The economic effect of the implementation of the invention is also obtained by expanding the range of forgings stamped by multi-piece stamping, and by increasing the durability of the stamp in the area of the bridges between the streams, the cost of manufacturing die tooling is reduced.

Claims (1)

 STAMP FOR MULTI-PIECE STAMPING, containing the upper and lower plates with engravings made on the counter surfaces with cavities forming blanks and final streams, characterized in that the individual cavities of the final stream are made with sequential alternation through one on the upper and lower stamp plates, while forming side surfaces of adjacent cavities of the final stream, lying in a common plane of symmetry perpendicular to the stamp connector, are offset from one another by a distance The dimension does not exceed the width of the bridge of the groove groove, and each individual cavity of the final stream along the connector surface by half the thickness of the bridge of the groove groove is made in the opposite half of the stamp.

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