Development Of A CNC Incremental Forming Machine With Pneumatic Balanced Blank Holder

CNC Incremental Forming technology is a kind of sheet metal digital forming technology, which has the characteristics of flexible, fast, low cost of small batch. It could adapt to the customization demand of modern production. CNC Incremental Forming equipment is the key to the in-depth study of the incremental forming process. In this paper, a new type of sheet metal CNC incremental forming machine was developed. The new bracket had the advantages of simple and compact structure, simple and convenient control, and low manufacturing cost.Study on the design of pneumatic balanced sheet metal bracket was done in the paper firstly. The structure of different types of sheet metal bracket was analyzed. In the consideration of the structure and size of the machine, the sheet metal bracket with separate guide and drive was designed. The role of sheet metal bracket in positive forming was analyzed. The goal of the design is to achieve the pursuit movement. The characteristics of exhausting and storaging to make the pressure stable were analyzed. The difference of between the exhausting and the in-taking to throttle was analyzed. An unique pneumatic system was designed to achieve the pursuit movement. By the means of storaging the quasi constant output of cylinder was obtained.Study on the realization of CNC Incremental Forming machine tool was done secondly. The servo feed system of CNC machine tools was selected. Study on the realization of pneumatic balance bracket. And the parts of sheet metal bracket were designed. Different types of incremental forming device were designed to fulfill different forming requirements. The 3D model of machine tool components and the assembly ligand model were built, and the static interference analysis, dynamic interference check, geometric parameter measurement and quality attribute analysis were carried out to improve the accuracy and efficiency of the design.At last,the assembly method and the precision detecting method of the machine tool ware discussed, and the precision of the machine tool was ensured by suitable machining method. Positive and negative forming test was operated.