Productivity and Superficial Quality of an Aspherical Die Using CAD/CAM

Gustavo Reinke,Walter Gennari Jr,Silvio José Gobbi

doi:10.1590/s1517-707620190003.0785

Abstract

Nowadays, it is hard to imagine modern industry without the manufacturing and design software aided by computer, known as CAD/CAM, once the search for excellence in complex geometry parts, reduced time, quality assurance and interchangeability is increasing. Within this quest, the CAD/CAM platform has become a significant factor in manufacturing, especially on complex surfaces parts, mainly because of superficial quality, reliability and product competitiveness. Defined as surface within one or more non-flat surfaces or non-square, usually represented by parametric models, the freeform surfaces are very complex, requiring the control of three or more axes simultaneously, making the CAM tool indispensable. Tests were carried out by milling of aspherical cavities, on VP100 steel samples, with cemented carbide ball nose inserts with TiAlN coating. Two cutting strategies – zig-zag and spiral – and two finishing (CAM) strategies – parallel plans and Z level – were also investigated. Final Surface quality, tool productivity and tool wear were related to machining time, surface roughness (Ra, Rz, Rku and Rsk) and tool wear (VBmax). Results showed that the chosen strategy (tool path) it is the main factor to productivity. Keywords: CAD/CAM; Superficial Quality; Milling; Finishing

Highlights

The CAD system can be defined as a computational system which aids in drawing activities, as elaboration, analysis, scaling, etc
For the CAM system, refers to manufacturing aided by a computer used to generate numeric commands programs to CNC machines, using geometric forms created by a design software [2]
In the 1990’s, this technology became more widespread with the enhancement and development of more user-friendly platforms, which made it an essential tool to the manufacturing industry [5]

Summary

Introduction

The CAD system can be defined as a computational system which aids in drawing activities, as elaboration, analysis, scaling, etc. [1]. For the CAM system, refers to manufacturing aided by a computer used to generate numeric commands programs to CNC machines (code G), using geometric forms created by a design software [2]. CAD/CAM systems (Computer Aided Design/Computer Aided Manufacturing) are being used in industries, with the manufacturing problem purpose in complex geometry parts [3]. This technology was first used in the 1950’s at the Massachusetts Institute of Technology (MIT). It had been used only by the big companies, such as the aerospace and automobilist industries, due to the high implantation costs and the need of skilled labor [4]. In the 1990’s, this technology became more widespread with the enhancement and development of more user-friendly platforms, which made it an essential tool to the manufacturing industry [5]

Objectives

Methods

Results

Conclusion