Investigation on Sheet Metal Incremental Formed Parts I World
Incremental forming is a complex forming process with continuously local cumulative deformation taking place during its process, and springback that forming quality affected by would occur. The springback evaluation method based on forming error compensation also was proposed, which it can be defined as the difference between theory and the actual amount of compensation along the measured direction. According to forming error compensation evaluation method, experiments was designed and implemented. And from the results that obtained it can be show, the magnitude of springback average (δE) of formed parts was very small, and the forming precision could be significantly improved by adopting compensation method. Based on double tensile stress state in the main deformation area, a hypothesis that there is little springback be arisen by bending behavior on the formed parts that was proposed. Keywords—Sheet metal, incremental forming, springback, forming error compensation, geometric accuracy
Investigation on Springback of Sheet Metal Numerical Control Incremental Forming
This paper studied the problem of springback in the sheet metal numerical control incremental forming process. By analyzing the influential factors and rules of springback in sheet metal incremental forming, a method of increasing forming angle to control springback is introduced.
A computer numerically controlled dieless incremental forming of a sheet metal
Abstract In a previous paper a new incremental tube-forming method was proposed in which forming is carried out by a series of movements of a hemispherical head tool without using any die or mandrel that corresponds to the product shape. This paper aims to develop a similiar method that can form flat metal sheets into three-dimensional shapes without using dedicated dies. For this purpose, very simple and compact tooling is devised and put on the bed of a numerically controlled (NC) machine tool. It can be controlled with an NC program, which is made by commercial CAD/CAM (computer aided design/manufacture) systems. The method is broadly applicable to any product where the outer surface is convex, and is examined for the forming of an aluminium sheet into cones and pyramids having an arbitrary number of sides with a half-apex angle with a minimum of 10°. Sharp edges between adjacent sides of the pyramid are easily formed. The ratio of the wall thickness of the product to that of the original sheet corresponds with the sine of the half-apex angle of the pyramid, and the sine law in shear spinning holds. The outer surfaces of the products have a glossy appearance due to ironing by the tool.