RU2207929C2 - Compound die - Google Patents

Abstract

FIELD: plastic metalworking; dies for sheet stamping. SUBSTANCE: compound die has female die for shaping and cutting tool which are rigidly mounted on upper slab, cutting female die, shaping punch and puller. Cutting tool is provided with movable cutting punch having cavity for forming drawing female die. Spring-loaded cutting female die is mounted on lower slab for motion along axis of die. Shaping punch is equipped with elastic cover plate mounted on its end face and made from polyurethane for example. EFFECT: extended technological capabilities. 1 dwg

Description

 The invention relates to the processing of metals by pressure, in particular to dies to ensure sheet stamping, and can be used in various industries to obtain a hollow part of a variable cross-section with an edge bent inward.

 Known stamp combined action for cutting and extracting hollow parts from a flat workpiece (Ehler, Kaiser "Cutting, bending and exhaust dies." M .: Mashgiz, 1961, S. 272, Fig.235), containing in one part the punch matrix for cutting and punch for drawing.

 A disadvantage of the known stamp is a limited technological ability, which does not allow to produce hollow parts of variable cross section with an edge bent inward.

 It is known to use an elastic insert in a stamp (A.S. 535985 MKI B 21 D 22/10, 1975) used to mold hollow parts of variable cross-section from a hollow billet, or a stamp (A. S. 771986 MKI B 21 D 22/10, 1978), according to which volumetric parts of variable cross section with a flange are obtained from sheet material.

 The disadvantage of these solutions is limited technological capabilities, which does not allow to produce hollow parts of variable cross-section with an edge bent inward.

 A technical solution is known, consisting in the fact that the working tool for cutting is installed in the stamp with the possibility of movement along the axis of the stamp and is spring-loaded with an elastic element (A.S. 1055564 MKI B 21 D 37/00, 1982).

 The disadvantage of this technical solution is the limited technological capabilities, which is manifested in the impossibility of obtaining hollow parts of variable cross-section with an edge bent inward.

 Known stamp combined action (A.S. 1215801 MKI B 21 D 37/08, 1984, prototype), containing the upper plate, on which the die is rigidly mounted for molding and with the ability to move along the pressure axis and interact with the die for die cutting tool , as well as containing the bottom plate, on which the punch for molding and the puller are rigidly mounted.

 The disadvantage of this stamp is the limited technological capabilities, manifested in the impossibility of sheet stamping, because this stamp is intended for volume stamping.

 The technical result of the proposed invention is the expansion of technological capabilities by making it possible to manufacture hollow parts of variable cross section with an edge bent inward by drawing from a sheet blank or strip.

 The task is achieved by the fact that in a stamp of combined action containing an upper plate on which the die for rigid forming is mounted and placed for moving along the pressure axis and interacting with the said die, the cutting tool, the bottom plate on which the die for rigid forming is mounted and the puller, the cutting tool is equipped with a movable punch for cutting with a cavity forming a die for drawing, and a spring-loaded die cutting die mounted on the bottom plate room along the axis of the stamp, and the punch for molding is equipped with an elastic pad mounted on its end, for example, made of polyurethane.

 The invention consists in the following. The proposed combined action stamp provides the possibility of manufacturing hollow parts of variable cross-section with an edge bent inward at one position and in one press stroke. This is achieved by the fact that the cutting of the workpiece is carried out by a punch-matrix for cutting and axial drawing perpendicular to the pressure axis. A variable cross section of the elongated part is attached in the forming part of the matrix, which is fixed like the punch matrix on the top plate and which is mated with the latter by radial drawing parallel to the pressure axis due to the settlement of the elastic part of the punch. This ensures not only a variable cross-section of the hollow part, but also the bending of the edge of the part inward. During the reverse stroke of the press slide, the obtained part remains in the forming part of the matrix and is removed from the punch. Then the part is removed by the ejector. Since the cross section of the obtained part is unstable and larger than the internal section of the die punch, the part remains on it and is removed with the latter by one of the known techniques, for example, a blower.

 The proposed device is illustrated by a drawing, which shows a stamp of combined action.

 The stamp contains a top plate 1 on which the cutting tool 2 and the clamp-puller 3 are vertically mounted, a forming matrix, consisting of a cutting punch 4, which is mounted in the tool 2 and the forming part 5, as well as an ejector 6. On the bottom plate 7 is reinforced with a die for cutting 8, a punch for molding 9, the upper part 10 of the punch for molding 9 is made of elastic material. Between the die die 8 and the punch 9, a spring-loaded clip 11 is installed.

 The stamp works as follows.

 In the initial position on the die cutting die 8 and the upper part 10 of the punch 9 set the source material 12 (sheet blank or strip). When the top plate 1 moves down, the strip 12 is pressed against the die cutting die 8. During the further course of the slider (not shown in the drawing), the clamp-puller 3 is pressed to the tool and then the latter is pressed to the upper plate 1. After connecting the stamp parts 3, 2, and 1 the blanking matrix 4 cuts the workpiece and extends from it a hollow part of constant cross section. The clamp 11 prevents the formation of corrugations. With further movement of the upper plate 1 down, the forming part 5 of the matrix reaches the upper part 10 of the punch 9. At this point, the sediment of the elastic part 10 of the punch begins. In this case, the workpiece is extruded radially parallel to the pressure axis, which provides not only a variable cross section of the obtained part 13, but also a bend of its edge 14 inward.

 At the end of the molding process of the part 13, the upper plate 1 rises. Between the forming part 5 of the matrix and the tool 2, a gap is formed. The finished part 13 is removed by the ejector 6 from the forming part 5 of the matrix and falls on the tool 2, in which the matrix for cutting down is fixed 4. From where the part is removed by one of the known methods, for example, by means of an air blower.

 The implementation of the proposed invention will expand the technological capabilities of the stamp, namely, to produce hollow parts of variable cross section with an edge bent inward at one position in one press stroke, i.e. combine cutting operations and axial and radial drawing.

Claims (1)

 A combined action stamp comprising an upper plate on which the molding matrix is rigidly mounted and placed for movement along the pressure axis and interacting with the said matrix, a cutting tool, a lower plate on which the molding punch is rigidly mounted, and a puller, characterized in that the cutting tool is equipped with a movable cutting die with a cavity forming a die for drawing, and a spring-loaded die cutting die mounted on the bottom plate with the possibility of movement along the axis of the head Pa, and a punch for forming features installed at its end elastic plate, e.g., of polyurethane.