Different innovative forming methods have been developed in order to make custom made goods at a reasonable cost. Due to stress induced between the tool and die, the procedure facilitates the ability of metal sheets to be formed. The dimensional accuracy of formed items can be improved by selecting the best Two Point Incremental Forming (TPIF) process parameters. In this work, TPIF of SS316L sheets of 0.8 mm was performed by varying the process variables such as die angle, step of forming, rate of feed and tool rotational speed to form a double wall angle circular cone with a forming height of 40 mm. The output responses such as surface roughness and thickness of the formed components were measured. An ANOVA was performed with a confidence level of 95 % to identify the most influential process parameter on the output response. The accuracy of the proposed methods, Grey Relational Analysis (GRA) and TOPSIS, were validated by choosing the optimal process parameter combination resulted from several experimental trial runs.
Incremental sheet forming (ISF) is an interesting new field of study in rapid sheet metal forming. ISF employs a basic mould to make parts with curved surfaces that do not require special equipment. To fulfil the needs of small scale and diversified markets around the world and address the difficulties of long production cycles and high prices, this technique has a wide variety of uses from aerospace to medical research. This work attempts to develop a Two Point Incremental Forming (TPIF) setup for the forming of stainless steel (AISI 316 L) sheets of uniform thickness. In this work, the forming process has been carried out by varying process parameters such as tool diameter, step depth, spindle speed and feed rate. Forming is carried out in a Vertical Milling Centre (VMC) with a hemispherical tungsten carbide tool. The output responses such as wall angle of the formed component, forming time, surface roughness, depth of the formed component was measured and was compared with the selected input parameters.
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