International Journal of Mechatronics and Manufacturing Systems
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International Journal of Mechatronics and Manufacturing Systems (1 paper in press)
Multistage tool path strategy to produce hemispherical shape using single point incremental forming process by Ashish Gohil, Bharat Modi Abstract: In a single point incremental forming process, components are produced by moving the hemispherical ended tool along the predefined tool path. Single-stage tool path strategies are used to form the components but it leads to problems related to formability, geometric accuracy, and non-uniform thinning especially in the case of components having a high wall angle. A multistage forming strategy can be used to improve the same. However, it leads to an issue like the formation of the stepped feature due to rigid body translation. In this paper, the multistage tool path strategy has been proposed to circumvent the issue related to stepped feature formation for hemispherical shape which is difficult to produce using a single-stage forming strategy due to 90 degree tool entry angle at the base. The hemispherical component is formed successfully using the proposed multistage forming strategy without the formation of protrusion defect. Moreover, the proposed strategy doesn't require the calculation of rigid body translation and toolpath modification. Results from the experimental and numerical investigation have been presented in this paper. The limiting value of percentage increase in surface area during the stage is found to be 30. Enhancement in formability using proposed multistage forming strategy, in terms of depth of forming, uniform strain distribution and thinning have been presented. Keywords: Incremental Sheet Forming(ISF); Single Point Incremental Forming(SPIF); Multistage tool path; Thinning band; Strain distribution; rigid body translation; protrusion defect.