Informatics Publishing Limited

Anis Farhan Kamaruzaman ¹, Azlan Mohd Zain ¹, Noorfa Haszlinna Mustaffa ¹, Noordin Mohd Yusof ², Farhad Najarian ²

Affiliations
1 Soft Computing Research Group, Faculty of Computing, UniversitiTeknologi Malaysia, 81310 UTM Skudai, Johor, MY
2 Faculty of Mechanical, UniversitiTeknologi Malaysia, 81310 UTM Skudai, Johor, MY

Abstract

Applications: Deep hole drilling is one of the machining processes which currently has been applied in the manufacturing area. The sophistication in some area such as aerospace, automotive, wind energy and nuclear power encourage the application of deep hole drilling. Objectives: In this study the effect of machining parameters on the roundness error during the drilling multiple deep holes of steel alloy using HSS Co5 DH100 straight shank twist drills for deep hole drilling of cold mold steel 718 towards the value of roundness error was investigated. Method: Drilling tests were carried out using a CNC milling machine under three different levels of minimum quantity lubricant (20, 30, 40 ml/hour) by drilling three different levels of depth of holes (65, 70, 75 mm), three different levels of spindle speeds (700, 800, 900 rpm) and three different levels of feed rates (50, 60, 70 mm/min). Findings: It was observed that the minimum value of roundness error obtained when using DoE approach and regression model is when cutting speed (V) is 700 rpm, minimum quantity lubricant (l) is 40 ml/hr and feed rate (f) equals 50 mm/min, depth of hole (d) is 65 mm. ANOVA analysis also proves that the combination of machining parameters obtained is significantly to the roundness error value that results in the roundness error minimum value and F statistic also showed that the model is important at the significance level of 95%.

Keywords

Deep Hole Drilling, Design of Experiment (DoE), Machining, Minimum Quantity Lubricant (MQL), Roundness Error, Twist Drills

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Azizah Mohamad ¹, Azlan Mohd Zain ¹, Nor Bahiah Hj. Ahmad ¹, Noordin Mohd Yusof ², Farhad Najarian ²

Affiliations
1 Soft Computing Research Group, Faculty of Computing, Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor, MY
2 Department of Materials, Manufacturing and Industrial Engineering, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor, MY

Abstract

Objective: The objective of this study is to investigate the experimental results of roundness error of machined holes using deep hole drilling process. The machining parameters include feed rate (f), spindle speed (s), depth of hole (d) and Minimum Quantity Lubrication MQL, (m). The work piece and tool material used in this study are Cold Mold Steel 718 and High Speed Steel, HSS (5mm diameter) with twist drill bit respectively. After that, to evaluate the quality of holes the roundness error has been used as machining performance. Method: A systematic approached based on Design of Experiment (DoE) was executed using Full Factorial design with added center point. Finding: Analysis of variance (ANOVA) was applied to the results to check the significance of the model. From the ANOVA analysis indicate that the model is significant for a confidence level of 0.05 or 95%.

Keywords

ANOVA, Cold Mold Steel 718, Deep Hole Drilling, Roundness Error.

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