Abstract

 Multipoint forming process is an engineering concept which means that the working surface of the punch and die is produced as hemispherical ends of individual active elements (called pins), where each pin can be independently, vertically displaced using a geometrically reconfigurable die. Several different products can be made without changing tools saved precious production time. Also, the manufacturing of very expensive rigid dies is reduced, and a lot of expenses are saved. But the most important aspects of using such types of equipment are the flexibility of the tooling. This paper presents an experimental investigation of the effect of three main parameters which are blank holder, rubber thickness and forming speed that affect the surface integrity for brass (Cu Zn 65-35) with 0.71 mm thickness.
 This paper focuses on the development of prediction models for estimation of the product quality. Using Analysis of Variance (ANOVA), surface roughness has been modeled. In the development of this predictive model, blank holder, rubber thickness and forming speed have been considered as model parameters. The mean surface roughness (Ra) is used as response parameter to predict the surface roughness of multipoint forming parts. The data required has been generated, compared and evaluated to the proposed models obtained from experiments.
 Taguchi algorithm was used to predict the forming parameters (blank holder, rubber thickness and forming speed) on product roughness in forming process of Brass (Cu Zn 65-35) based on orthogonal array of L9 and finally ANOVA was used to find the optimum parameters that have effect on the product quality.
Highlights
Multipoint forming (MPF) is a modern manufacturing technology for three-dimensional sheet metal forming process
The results of this work is to investigate the effect of various forming parameters (blank holder (B), rubber thickness (R) and forming speed (S)) with respect to surface roughness that occurs on the forming parts of Brass (Cu Zn 65-35) using multi-point forming process
The current research reviewed some important aspects related with surface roughness on forming of materials with special emphasis in brass-alloy
Summary
Multipoint forming (MPF) is a modern manufacturing technology for three-dimensional sheet metal forming process. A series of experiment have been carried out in design of experiments to investigate the effect of forming parameters such as blank Holder, rubber thickness and forming speed on surface roughness. Show during the forming process, the deformation of the interpolator formed workpiece can induce a shape error and the blank holder can eliminate or reduce dimples in the work-piece. They predict the optimum value of some process variable that effect on surface roughness and estimate the empirical equation that present the response value with respect to process variables. Significant influence on surface quality was identified they by blank holder types, cushion thickness and forming speed in multi-point forming process. Table (4) illustrated the present work and the test results, and figures (8, 9 and 10) represent the relationship between experimental data
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