Original scientific paper

TOOL PATH PLANNING FOR MACHINING FREE-FORM SURFACES

Subhajit Sarkar orcid.org/0000-0002-9505-839X ; Department of Mechanical Engineering, Indian Institute of Engineering Science and Technology (Formerly Bengal Engineering and Science University), Shibpur, Howrah, West Bengal, India
Partha Pratim Dey ; Department of Mechanical Engineering, Indian Institute of Engineering Science and Technology (Formerly Bengal Engineering and Science University), Shibpur, Howrah, West Bengal, India

Abstract

This paper is about new iso-parametric tool path planning for machining trimmed free-form surfaces. The trimmed surface has been re-parameterized by two different parameterization techniques, namely, the partial differential equation method and the newly developed boundary interpolation method. The efficiency of the scheme has been measured in terms of path length and computational time needed for machining some typical surfaces. Conventionally, the forward-step is calculated by approximating the cutting curve with the osculating circle. The actual tolerance of the forward-step may go beyond the prescribed limit due to the circular arc approximation. In this study, the actual cutting curve has been considered to keep the tolerance in the forward-step below the prescribed value. The new algorithm has been tested on some typical surfaces and the results show a significant improvement in the surface profile in terms of tolerance of the forward-step.

Keywords

iso-parametric tool path; CNC machining; CAM

Hrčak ID:

138266

URI

https://hrcak.srce.hr/138266

Publication date:

17.4.2015.

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