RESEARCH ON IMPACT FACTORS INFLUENCING ROUNDNESS OF PRODUCTS MADE OF AL 99.5% FORMED BY FLOW FORMING TECHNOLOGY
Cold forming is characterized by a number of advantages which are mainly result of material strengthening during the final workpiece formation. Effects of material strengthening are reflected in shaping accuracy and in improving mechanical characteristics of workpieces. Flow forming is one of the specific forming methods used to form different parts of rotationally symmetrical parts in military, aeronautical, nuclear and other industries, which uses positive effects of the material strengthening. Design of products for extremely demanding industries, in addition to dimensional control, requires checking the accuracy of their circular shape. This paper, through the example of making tubular workpieces from Al 99.5% using flow forming technology, presents a method for determining the workpiece roundness using a 3D Coordinate Measuring Machine and analyzes the influence of number of revolutions, shift and the deformation rate to the deviation of roundness.