Step feature roll-stamping forming limit evaluation die and measuring method by applying same

Abstract

The invention provides a step feature roll-stamping forming limit evaluation die and a measuring method by applying the same. The step feature roll-stamping forming limit evaluation die comprises an upper die set and a lower die set, wherein the upper die set comprises five independent die blocks, at least one upper die block comprises a step feature, the lower die set comprises five independent die blocks, at least one lower die block comprises a step feature, the step feature of the upper die block is matched with the step feature of the lower die block, materials are dragged to flow in therotating process of the die blocks, and the step features are formed on a formed sample piece. By forming the step features of different sizes and measuring the strain of the step feature area and thesizes of the step features, the forming limit of step feature roll-stamping forming of plates is evaluated, and a test basis is provided for establishing a design criterion of step feature roll-stamping forming.

Description

technical field [0001] The invention relates to the field of sheet metal forming, in particular to a mold for evaluating the forming limit of a step feature roller stamping. Background technique [0002] The roll punching process is a composite forming process, the essence of which 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. The step feature is commonly used in various mechanical structural parts, and the variable depth feature is also a common step feature. At present, the research on the forming limit of sheet metal is mostly limited to 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, which specifically relate...

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Problems solved by technology

[0003] However, the above-mentioned measuring equipment for the sheet metal forming limit is not aimed at the roll forming process, and there is no patent proposal on the forming limit evaluation mold of the roll forming process.

However, due to the complexity of stress and strain in the forming process of roll punching, the forming limit obtained by general tests has a large error when used in the roll punching process, which is not conducive to the application and promotion of the roll punching process.

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