RU2042455C1 - Method of making hollow parts with inclines bottom by deep drawing - Google Patents

Abstract

FIELD: metal pressure forming. SUBSTANCE: method comprises steps of shaping variable-height corrugations on portions of a flange, being adjacent to zones of maximum curvature of a wall of a part in a plan view, in such a way, that height values of the corrugations are being increased to an outer side of the flange and axis of the corrugations are being placed normally relative to a line tangent to a hollow portion contour; then performing drawing operation of the hollow portion with simultaneous straightening of the corrugations of the flange; using a blank, being rectangular in the plan view, and making the part by two transitions with formation of the corrugations in angular zones of the flange at the first transition and performing a drawing of the hollow portion with simultaneous straightening of the corrugations at the second transition. EFFECT: enhanced quality of parts due to provision of possibility of redistribution of the blank material along a perimeter of the flange towards a zone, being adjacent to a place of the part, having maximum depth. 1 cl, 3 dwg

Description

 The invention relates to the processing of metals by pressure, in particular, to methods for manufacturing hollow parts of an open loop with an inclined bottom by sheet stamping.

 A known method of manufacturing box-shaped parts, according to which at first in the flange sections adjacent to the zones of maximum curvature of the part wall in plan, corrugations of variable height increasing to the outside of the flange are formed, the axes of which are perpendicular to the tangent to the contour of the hollow part, and then the hollow is drawn parts with simultaneous straightening of the corrugations on the flange. However, in the known method, when drawing, it is impossible to redistribute the material along the perimeter of the workpiece (ribs on the matrix and clamp, forming corrugations in the area of the workpiece flange, prevent the above movement), which can lead to the formation of gaps and thinning in the convex parts of the parts.

 The purpose of the invention is to improve the quality of manufactured parts by preventing tearing and reducing thinning in the convex parts of the parts.

 The goal is achieved by reducing the resistance to pulling the workpiece material into the cavity of the matrix by reducing the force required to redistribute the material along the outer contour of the flange in the direction of the zone adjacent to the place of greatest depth of the part, for which, first, in sections of the flange adjacent to the zones of maximum curvature of the part wall in plan, corrugations of variable height are shaped, increasing towards the outer side of the flange, the axes of which are perpendicular to the hollow contour Asti, and then produce an extract hollow portion with simultaneous straightening of the corrugations on the flange. In contrast to the known method, a workpiece is used that is rectangular in plan, the part is obtained in two transitions, the corrugations are formed in the corner zones of the flange in the first transition, and the hollow part is exhausted while corrugations are straightened in the second transition, and the corrugations are straightened on the flat working part of the matrix due to the simultaneous influence of the pulling force acting perpendicular to the axis of the corrugations from the part of the workpiece located in the deepest part of the matrix, and the clamping force acting on the top of the corrugation.

 Figure 1 shows the first transition shaping; figure 2 second transition; figure 3 diagram of the movement (flow) of the material at the second transition.

 The method is as follows.

 The blank 1 (Fig. 1) is laid on the matrix 2 of the first transition and elastic or rigid punch form the protrusions in the form of corrugations 3, the height and width of which increases towards the outer side of the flange. Corrugations are formed on the workpiece in the corner zones of the flange adjacent to the zones of maximum curvature of the part wall in plan, the axis of the corrugations is perpendicular to the tangent to the contour of the hollow part.

 Then the workpiece is laid on the matrix 4 (figure 2) of the second transition and a rotary punch 5 with clip 6 extract the hollow part of the part to obtain the required depth and straighten the corrugations on the flange. Since the corrugated sheet is much easier to stretch than flat, the movement of the flange material in the direction shown in FIG. 3 is greatly facilitated, and as a result, the likelihood of tearing, as well as thinning in the convex part of the part, is reduced.

Claims (1)

 METHOD FOR PRODUCING HOLLOW DETAILS WITH A SLOPE BOTTOM DEEP EXHAUST, according to which, first, in the sections of the flange adjacent to the zones of maximum curvature of the part wall in plan, corrugations of variable height are enlarged, increasing to the outside of the flange, the axes of which are perpendicular to the tangent part then carry out the extraction of the hollow part while straightening the corrugations on the flange, characterized in that they use a workpiece rectangular in plan, the part is obtained in two transitions, g Offers form in the corner zones of the flange in the first transition, and the hood of the hollow part with the straightening of the corrugations in the second transition.

Images