Incremental bending and forming method of hat-shaped member

Abstract

Disclosed is an incremental bending and forming method of a hat-shaped member. Complex hat-shaped member with multi-arcs is formed through a simple mold matching with a plant bending machine. The method includes unfolding each arc of the complex hat-shaped member with the multi-arcs into a plane to determine the size of the plane blank; establishing a three-dimensional model according to the size of the plane blank, and dividing areas by adopting arcs as standards; performing numerical simulation on the forming process complex hat-shaped member with the multi-arcs, incremental bending arcs on two sides, then bending a central arcs, and finally bending boundaries of the areas; determining feeding amount of the plate blanks and downward punching amount of each step during the bending process according to the simulation result. By the aid of the method, the thickness of each part of a formed hat-shaped member is consistent basically, and surface quality and forming accuracy of the formed member can be guaranteed well; the process of controlling deformation is simple, and the method has the advantages of low cost and short period.

Description

technical field [0001] The invention relates to the technical field of forming hat-shaped thin plate parts, in particular to a hat-shaped progressive bending forming method and a mold. Background technique [0002] Parts with hat-shaped cross-section are widely used in the automobile and missile industries. Such components are usually stamped and formed by bending the sheet through a die at room temperature. After unloading, the two side walls of the section will spring back in the bottom fillet bending area, causing the side walls to rotate outward around the bottom fillet, resulting in excessive springback. Generally, the hat shape is controlled by reducing the radius of the punch fillet. However, when the fillet radius is small enough to a certain range, the effect of continuing to reduce the fillet radius on springback is no longer obvious, and it will also cause other defects such as cracking. It must be combined with other springback control methods and repeated Modif...

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Problems solved by technology

[0002] Parts with hat-shaped cross-section are widely used in the automobile and missile industries. Such components are usually stamped and formed by bending the sheet through a die at room temperature. After unloading, the two side walls of the section will spring back in the bottom fillet bending area, causing the side walls to rotate outward around the bottom fillet, resulting in excessive springback. Generally, the hat shape is controlled by reducing the radius of the punch fillet. However, when the fillet radius is small enough to a certain range, the effect of continuing to reduce the fillet radius on springback is no longer obvious, and it will also cause other defects such as cracking. It must be combined with other springback control methods and repeated Modify the mold surface to improve forming accuracy and reduce springback. At the same time, for complex hat-shaped parts with multiple arcs, multiple molds or compound molds are often required. In addition, the design and manufacturing cycle of the punch and die is long and the cost is high. , not suitable for the manufacture of small batch parts and new product prototypes, and a set of molds can only correspond to one kind of parts, and the mold reuse rate is low

[0003] Jilin University publicly adopted the cold stamping method to study the forming process and mold of a certain type of subway carbon steel car hat-shaped side column, (Gu Zhengwei, Cai Zhongyi, Xu Hong, Zhang Zhenglin, Zhang Zhiqiang. Springback analysis and analysis of hat-shaped cross-section cold stamping parts Compensation. Journal of Tsinghua University (Natural Science Edition) 50(2), 2010). In this paper, the compensation method for anti-deformation and springback of stamping parts with hat-shaped cross-section is studied, the springback calculation is carried out, and the radius of punch fillet corners is analyzed. Influenced by influence, the optimal punch fillet radius was determined, and the process parameters such as blank holder force, punch bottom chord height, roof back pressure and springback control parameters were optimized, and the springback of the component was effectively controlled, and the precision met the design requirements, but , this method has the following disadvantages. First of all, there are many influencing parameters that need to be controlled, which increases the difficulty of the specific production process, requires a reverse deformation mold, increases the complexity of the mold, and increases the manufacturing cost. In addition, although the springback is controlled , but the problem of indentation or even cracks at the bottom fillet of the stamped part due to the thinning of the material has not been solved

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