Effect of Cutting Parameters on the Hole Quality in Dry Drilling of Some Thermoplastic Polymers

Florin Susac,Valentin Tabacaru,Nicusor Baroiu,Virgil Gabriel Teodor

doi:10.37358/mp.19.1.5160

Abstract

Drilling of polymeric materials can be challenging when holes are produced in large scale due to the necessity of controlling the holes quality. This paper presents the effect of machining parameters on the hole quality, in terms of surface roughness and circularity error, in drilling of high density polyethylene, polyamide and polyacetale. The analysis of variance was performed in order to assess the significance of cutting parameter on the hole quality parameters. The experimental results indicate that different cutting conditions are to be employed in order to achieve the optimum surface roughness and circularity.

Highlights

Drilling of polymeric materials can be challenging when holes are produced in large scale due to the necessity of controlling the holes quality
For POM, as shown in figure 5c, the circularity error significantly decreased with increasing drill diameter for the same cutting parameters
When drilling at a feed rate/spindle speed ratio of 0.1/rev (i.e. 50/500), circularity error decreases from 0.0787±0.043 mm to 0.0117± 0.006 mm with increasing drill diameter from 8 to 10 mm

Summary

Introduction

Drilling of polymeric materials can be challenging when holes are produced in large scale due to the necessity of controlling the holes quality. Hole quality is generally estimated based on a number of parameters, such as surface roughness, circularity error [2-5], which in turn are affected by the machining parameters, including drill geometry. Many studies have been conducted for the last several decades to characterize the influence of cutting parameters on the hole surface quality and to understand the tool wear mechanisms in the drilling of polymers and polymer based composites [6-14]. Delamination is another major problem associated with machining of fiber-reinforced composites, which tends to reduce structural integrity of the composite structures [3-4]. Despite the fact that these polymeric materials are available at a very low price and have very good mechanical characteristics, such as strength, hardness or wear resistance, their machinability in terms of hole quality was not systematically addressed

Objectives

Results

Conclusion