Mold for evaluating convex-feature roll punching forming limit and measuring method of mold

Abstract

The invention provides a mold for evaluating a convex-feature roll punching forming limit and a measuring method of the mold. The mold comprises an upper mold group and a lower mold group. The upper mold group comprises independent mold blocks, and a concave upper mold block has a concave feature; the lower mold group comprises independent mold blocks, and a convex lower mold block has a convex feature; and the concave feature of the upper mold block and the convex feature of the lower mold block are matched with each other, and materials are drawn to flow in the rotation process of the mold blocks to form a convex feature. The forming limit of convex features formed on sheets through roll punching are evaluated by forming the convex features in different sizes and measuring the strain ofa convex-feature area and the sizes of the convex features, and a test basis is provided for establishing the design criteria of roll punching forming parts.

Description

technical field [0001] The invention relates to the field of plate forming, in particular to a mold for evaluating the forming limit of a convex feature roller stamping and a measuring method thereof. Background technique [0002] The roll punching process is a composite forming process, and its essence is to combine the stamping process with the roll bending process. The roll punching process is especially suitable for the processing of narrow and long variable cross-section parts. In addition, the forming process is stable and the redundant deformation of the sheet is small. A raised feature is a common variable-section feature that is mostly used for assembly and positioning. Most of the existing researches on the forming limit are on the forming limit of the stamping process, and the patent CN1903474A provides a forming limit test equipment on the hydraulic bulging forming process. Patent CN2676182Y provides a mold for forming test, in particular, it relates to a formi...

AI Technical Summary

Problems solved by technology

[0003] However, the above measuring equipment for forming limit is not aimed at the roll forming process, and the current patent proposal related to the forming limit evaluation mold of the roll forming process

However, due to the complexity of the stress and strain in the forming process of the roll punching process, the forming limit obtained by the general test is not suitable for the roll punching process, and the lack of data on the roll punching forming limit of variable cross-section features seriously restricts the application of the roll punching process and promotion

Images