Mold and method for forming closed recess

Abstract

The invention relates to a mold for forming a closed recess on a sheet metal, characterized in that the mold has an upper mold and a lower mold, and a deformable first punch (7) is arranged on the upper mold, The first punch (7) has a first groove (17) for guiding deformation on the side facing the plate to be formed, the lower mold has a rigid second punch (11), and the first The two punches (11) have a second groove (18) corresponding to the closed recess to be formed on the side facing the plate to be formed, and the outer profile of the first groove is larger than that of the second groove. profile such that said first groove (17) covers the second groove (18).

Description

technical field [0001] The invention relates to a mold for forming closed recesses in sheet metal. Furthermore, the invention relates to a method for forming closed recesses in sheet metal. The mold and the method according to the present invention are especially suitable for forming closed recesses such as the handle buckle recess of the outer door panel of the automobile, the car logo recess of the engine cover outer panel, and the oil filler port of the side wall outer panel. Background technique [0002] It is known from the prior art that there are obvious recesses in several places on the outer cover of the automobile, such as the recess of the door outer panel handle, the recess of the car logo on the outer panel of the engine cover and the oil filler port of the side wall outer panel, etc. The recesses are usually realized in the prior art by drawing or shaping methods. However, in the case of drawing forming, due to the limitation of the drawing or shaping method ...

AI Technical Summary

Problems solved by technology

In the concave area of ​​the hand buckle, the force exerted by the punch of the upper die on the sheet is far greater than the pulling force transmitted to this part of the area by the pressing force, so the sheet material outside the fillet will flow into the hand buckle beyond the fillet of the hand buckle recess In the recess, moreover, the contour of the fillet of the handle recess is sometimes irregular, which leads to an uneven inflow of material, which in turn creates an uneven tangential compressive stress in the area of ​​the handle recess fillet, which leads to product defects , e.g. producing pits

For the hand buckle recess formed by drawing, due to the limitation of the method itself, product defects are inevitable. Even if a strong pressure is applied within the range of 20mm to 40mm from the peripheral area of ​​the hand buckle recess, such product defects cannot be completely overcome

At present, almost all products on the market have product defects in the concave area of ​​the hand buckle. Although a lot of manpower and material resources have been spent in the debugging process, the product defect problem has not been completely resolved.

[0003] Also known in the prior art is the method of stamping the sheet through an elastic material to form the sheet, but the principle is still the same as that of drawing forming, and the stamping of the groove is through the rapid deformation of the elastic material to shape the sheet. achieved by rapid prototyping, thus still prone to product defects

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