RU2062169C1 - Builtup punch for indirect or combined extrusion to dies sets with guiding of punch along die - Google Patents

Abstract

FIELD: metal pressure forming. SUBSTANCE: a builtup punch for indirect or combined extrusion to die sets with punch guiding along a die includes a rod portion with a working end, tightly fit in a sleeve, provided by a guiding part for engaging with a guiding part of a die. The sleeve has a turning at a side of the working end of the rod portion, the turning has a dimension along its inner diameter being more, than a dimension of an outer diameter of a part to be formed. A distance from the working end of the rod portion until an end of the turning of the sleeve is defined by a depth of a cavity, being extruded in the part, a distance from the working end of the rod portion until an end surface of the guiding part of the sleeve is defined by a predetermined relation. EFFECT: enhanced structure of the builtup punch. 1 cl, 2 dwg

Description

 The invention relates to the field of metal forming, in particular to the design of a tool for the manufacture of hollow parts, mainly cold forging in stamps with the direction of the punch in the matrix, and can be used to expand the technological capabilities of stamping.

 A prefabricated punch is known that is used for reverse or combined extrusion operations in dies with a punch direction in a die, comprising a rod part with a working end pressed with an interference fit into a sleeve provided with a guide part intended to interact with the guide part of the matrix / 1 /.

 A disadvantage of the known design of the punch is the inappropriateness of manufacturing parts with a cavity depth of more than 1.5 diameters of the obtained hole, since otherwise the length of the punch, the height of the die, the stroke of the slide and the ejector significantly increase.

 The technical result achieved by the invention is to expand the technological capabilities of the stamping process in dies with the direction of the punch along the die by increasing the depth of the cavity extruded into the part without increasing the size of the die in height. The basis for the solution of this problem is the design change of the prefabricated punch by introducing an additional structural element in order to reduce the distance from the working end of the prefabricated punch to the end surface of the guide part of the sleeve, which leads to an increase in the depth of the cavity obtained in the part, provided that the size of the matrix is maintained in height.

This is achieved by the fact that in the assembly punch for reverse or combined extrusion to dies with the direction of the punch along a matrix containing a rod part with a working end pressed with an interference fit into the sleeve, provided with a guide part designed to interact with the guide part of the matrix, in the sleeve from the side the working end of the core part is made a groove with an inner diameter larger than the outer diameter of the workpiece, the distance from the working end of the core part to the end a bore in the sleeve is determined by the depth of the cavity in the extruded parts, and the distance from the working end of the shaft portion to the end surface of the guide portion of the sleeve is determined by the relation
H hout + Hper. + H cal. + H3,
where: hout initial height of the deformed volume of the workpiece;
Nper. size of the height of the transition from the guide to the working part of the matrix;
Nkal.boyask the size of the calibrating matrix belt in height;
H3 the size of the gap between the end surface of the guide part of the sleeve and the beginning of the transition from the guide to the working part of the matrix.

 In FIG. 1 shows a prefabricated punch for reverse or combined extrusion to dies with the direction of the punch in the matrix. Figure 2 shows the tool assembly of the stamp with the direction of the punch in the matrix at the moment of contact of the combined punch with the workpiece.

The pre-assembled punch for reverse or combined extrusion to dies with the direction of the punch in the matrix comprises a core part 1, pressed with an interference fit into the sleeve 2. In the sleeve 2, a groove 3 is made in the sleeve 2 from the side of the working end of the core part 1, with an inner diameter larger than the outer diameter of the workpiece , the distance from the working end of the rod part 1 to the end of the groove 3 in the sleeve 2 is determined by the depth of the cavity extruded into the part. The direction of the assembled punch in the matrix is carried out by the guide part 4 of the sleeve 2. From figure 2 it follows that the distance H from the working end of the rod part 1 to the end surface of the guide part 4 of the sleeve 2 is determined by the ratio:
H h output + H per. + H cal. + H3.

where: hout is the initial height of the deformed volume of the workpiece;
Nper. size of the height of the transition from the guide to the working part of the matrix;
Nkal.Poyaska-the size of the calibrating matrix belt in height;
Н3 the size of the gap between the end surface of the sleeve and the beginning of the transition from the guide to the working part of the matrix.

Claims (1)

Combined punch for reverse or combined extrusion to dies with the direction of the punch in the matrix, containing the core part with a working end pressed into the sleeve, equipped with a guide part designed to interact with the guide part of the matrix, characterized in that in the sleeve on the side of the working end of the core part, a groove is made, with a size larger than the size of the outer diameter of the workpiece, the distance from the working end of the core to the end otochki determined depth in the sleeve cavity in extruded parts, and the distance from the working end of the shaft portion to the end surface of the guide portion of the sleeve is determined by the relation
H = h out _. + H _per + H _{cal. girdle} + H _s
where h _vyd. initial height of the deformed volume of the workpiece;
H _lane size of the height of the transition from the guide to the working part of the matrix;
H _{cal girdle the} size of the calibrating girdle of the matrix in height;
H _{c the} size of the gap between the end surface of the sleeve and the beginning of the transition from the guide to the working part of the matrix.

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