Bending die capable of controlling high-strength steel springback and application method thereof

Abstract

The invention discloses a bending die capable of controlling high-strength steel springback and an application method thereof. The bending die capable of controlling high-strength steel springback comprises an upper die and a lower die which can be opened and closed relatively. The upper die comprises an upper die base, an upper padding plate and a pressing plate which are connected through a guide column. The upper die further comprises a punching pin assembly and an upper die spring. The lower die comprises a lower die base, lower padding feet, a lower padding plate, a sliding block assemblyand a lower die resetting assembly. According to the bending die capable of controlling high-strength steel springback, products are bent and formed through the punching pin assembly, the sliding block assembly, the lower die resetting assembly and under the action of a punching machine; besides, the bending die is of a purely mechanical structure and applicable to machining of steel plates of different thickness and sizes; compared with a former manner that a cylinder is used to conduct bending, the bending die has the advantage that the volume is small; materials used by the die are reduced; repeated debugging of cylinder pressure is not needed, and the research and development costs are reduced; nitrogen springs are adopted by both the upper die spring and the lower die spring; the elastic curve is gentle; pre-tightening is not needed; steel movement in the loading process is prevented; and in addition, the whole process of forming is uniform in pressure, and the condition that stress is uneven is prevented from occurring.

Description

technical field [0001] The invention relates to the technical field of mechanical processing, in particular to a bending die capable of controlling the springback of high-strength steel and a use method thereof. Background technique [0002] Bending springback of high-strength steel has always been a technical difficulty of cold stamping dies. In the existing stamping dies, the bending part of the sheet is generally formed by pushing the block with an oil cylinder. Although the block is pushed by the oil cylinder, due to the different thickness 1. Different sizes of high-strength steel require different pressures. When replacing steel for processing, it is necessary to repeatedly adjust the pressure of the cylinder, which increases the cost of research and development. Moreover, when the cylinder is pushed, the pressure value is fixed and cannot follow the steel in the mold. Due to the change of the steel, it is easy to cause uneven stress distribution of the steel, springba...

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Problems solved by technology

[0002] Bending springback of high-strength steel has always been a technical difficulty of cold stamping dies. In the existing stamping dies, the bending part of the sheet is generally formed by pushing the block with an oil cylinder. Although the block is pushed by the oil cylinder, due to the different thickness 1. Different sizes of high-strength steel require different pressures. When replacing steel for processing, it is necessary to repeatedly adjust the pressure of the cylinder, which increases the cost of research and development. Moreover, when the cylinder is pushed, the pressure value is fixed and cannot follow the steel in the mold. Changes due to the change of the steel are likely to cause uneven stress distribution and springback after forming, which affects product quality, and the oil cylinder takes up a lot of space, resulting in more mold materials and increased costs.

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