Machinability of AISI 316 Austenitic Stainless Steel With Cryogenically Treated M35 High-Speed Steel Twist Drills

2012 ◽  
Vol 134 (6) ◽  
Author(s):  
Adem Çiçek ◽  
Ilyas Uygur ◽  
Turgay Kıvak ◽  
Nursel Altan Özbek
Keyword(s):  
Surface Roughness ◽  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
High Speed ◽  
Thrust Force ◽  
High Speed Steel ◽  
Hole Quality ◽  
Microhardness And Microstructure ◽  
Aisi 316 ◽  
Twist Drills

In this paper, machinability of AISI 316 austenitic stainless steel was investigated using cryogenically treated and untreated high-speed steel (HSS) twist drills. Machinability of AISI 316 austenitic stainless steel was evaluated in terms of thrust force, tool life, surface roughness, and hole quality of the drilled holes. Experimental results showed from 14% to 218% improvements for treated tool lives. Thrust force, surface roughness, and hole quality are better with treated drills when compared with untreated drills. These improvements were mainly attributed to formation of fine and homogeneous carbide particles and transformation of retained austenite to martensite. Microhardness and microstructure observations verified these formations.

An experimental investigation of thrust force, delamination and surface roughness in drilling of jute/carbon hybrid composites

2020 ◽  
Vol 17 (5) ◽  
pp. 661-674 ◽  
Author(s):  
Sathiyamoorthy Margabandu ◽  
Senthilkumar Subramaniam
Keyword(s):  
Surface Roughness ◽  
Feed Rate ◽  
High Speed ◽  
Thrust Force ◽  
Hybrid Composites ◽  
Low Cost ◽  
Cutting Speed ◽  
High Speed Steel ◽  
Composite Plates ◽  
Content Type

Purpose This paper aims to deal with the influence of cutting parameters on drill thrust force, delamination and surface roughness in the drilling of laminated jute/carbon hybrid composites. Design/methodology/approach The hybrid composites were fabricated with four layers of fabrics, which are arranged in different sequences using the hand-layup technique. Drilling experiments involved drilling of 6 mm diameter holes on the prepared composite plates using high-speed steel and solid carbide drill materials. Analysis of variance was used to find the influence, percentage contribution and significance of drilling parameters on drilling-induced damages. Scanning electron microscopy analysis was also conducted to understand the fracture behavior and surface morphology of the drilled holes. Findings The experimental study reveals that the most significant effect was the feed rate influenced the drill thrust force and the drill speed influenced both delamination factor and surface roughness of hybrid fiber-reinforced composites. From observations, the suggested combination for drilling jute/carbon hybrid composites is carbide drill, spindle speed of 1,750 rpm and feed of 0.03 mm/rev. Originality/value The new lightweight and low-cost hybrid composites were developed by hybridizing jute with carbon fabrics in the epoxy matrix with interplay arrangements. The influence of cutting speed and feed rate on delamination damage and surface roughness in the drilling of hybrid composites have been experimentally evaluated.

scholarly journals Modelling Surface Roughness in the Function of Torque When Drilling

Metals ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 337
Author(s):  
Zdravko Krivokapić ◽  
Radoslav Vučurević ◽  
Davorin Kramar ◽  
Jelena Šaković Jovanović
Keyword(s):  
Experimental Data ◽  
Surface Roughness ◽  
High Speed ◽  
High Speed Steel ◽  
Arithmetic Mean ◽  
Mean Deviation ◽  
Hardness Level ◽  
Nonlinear Regression Models ◽  
Limit Value ◽  
Twist Drills

Given the application of a multiple regression and artificial neural networks (ANNs), this paper describes development of models for predicting surface roughness, linking an arithmetic mean deviation of a surface roughness to a torque as an input variable, in the process of drilling enhancement steel EN 42CrMo4, thermally treated to the hardness level of 28 HRC, using cruciform blade twist drills made of high speed steel with hardness level of 64–68 HRC. The model was developed using process parameters (nominal diameters of twist drills, speed, feed, and angle of installation of work pieces) as input variables varied at three levels by Taguchi design of experiment and measured experimental data for a torque and arithmetic mean deviation of a surface roughness for different values of flank wear of twist drills. The comparative analysis of the models results and the experimental data, acquired for the inputs at the moment when a wear span reaches a limit value corresponding to a moment of the drills blunting, demonstrates that the neural network model gives better results than the results obtained in the application of multiple linear and nonlinear regression models.

scholarly journals Model of Dependence Between the Parameters of Surface Roughness and the Parameters of Form and Location During the Machining by Drills with the use of Artificial Neural Networks

2021 ◽  
Author(s):  
Zdravko Krivokapić ◽  
Radoslav Vučurević ◽  
Predrag V. Dasic ◽  
Petar Ivanković
Keyword(s):  
Neural Networks ◽  
Surface Roughness ◽  
Artificial Neural Networks ◽  
High Speed ◽  
High Speed Steel ◽  
Machined Surface ◽  
Drilling Operation ◽  
Artificial Neural ◽  
Twist Drills

Abstract This paper presents a model of dependence between the parameters of surface roughness and the parameters of cylindricity and eccentricity in drilling operation for the enhancing steel EN 42CrMo4, hardness 28 HRC, with twist drills DIN 338 made of high-speed steel EN HS6-5-2, with normal blade. The quality of machining, besides the accuracy of measures, completely determined with the values of the parameters of the surface roughness and the parameters of form and location, hence this paper is oriented to the creating models between parameters of the quality of a machined surface and parameters of deviations from form and position. By the developing models based on artificial neural networks and using experimental results, it is possible to analyse the quality of machining on the basis of parameters of a surface roughness.

Experimental Analysis of Wear Mechanism and Tool Life in Dry Drilling of Al2024

2012 ◽  
Vol 566 ◽  
pp. 217-221 ◽  
Author(s):  
Ali Davoudinejad ◽  
Sina Alizadeh Ashrafi ◽  
Raja Ishak Raja Hamzah ◽  
Abdolkarim Niazi
Keyword(s):  
Tool Wear ◽  
Tool Life ◽  
Wear Mechanisms ◽  
High Speed ◽  
Thrust Force ◽  
Cutting Speed ◽  
High Speed Steel ◽  
Dry Machining ◽  
Hole Quality ◽  
High Cutting Speed

Aluminum alloy is widely used in industry and various researches has been done on machiability of this material mainly due to its low weight and other superior properties. Dry machining is still interesting topic to reduce the cost of manufacturing and environmental contaminations. In present study dry machining of Al 2024 investigated on tool life, tool wear mechanisms, hole quality, thrust force and torque. Different types of high speed steel (HSS) tools utilized at constant feed rate of 0.04 mm/rev and cutting speeds within the range of 28 and 94 m/min. Experimental results revealed that HSCo drills, performed better than HSS drills in terms of tool life and hole quality. The main wear mechanisms which analyzed by scanning electron microscope found abrasive and adhesion wear on flank face, besides, BUE observed at chisel and cutting edges. However tool wear and BUE formation found more significant at high cutting speed. In terms of thrust force, two facet HSCo tools, recorded higher thrust force than four facet HSS drills.

The Development of Special Drills for High-Efficient Drilling Austenitic Stainless Steel Part II: Coating Selection and Experiment Research

2006 ◽  
Vol 315-316 ◽  
pp. 200-204 ◽  
Author(s):  
Ming Chen ◽  
Gang Liu ◽  
Lu Lu Jing ◽  
Z.G. Hu ◽  
X.F. Zhu ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Tool Life ◽  
High Speed ◽  
Cutting Tool ◽  
Removal Rate ◽  
High Speed Steel ◽  
Steel Part ◽  
Ticn Coating ◽  
High Efficient

Coating is an effective method to solve the contradiction between the wear resistance and the toughness for tool materials and the coated tool can yield satisfied cutting performances. Now the coated high-speed steel (HSS) drill is widely used in drilling of stainless steel. This paper studied the tool life of the TiN, the TiAlN and the TiCN coated special drills in drilling austenitic stainless steel 1Cr18Ni9Ti through contrastive experiments. The tool life of the TiN coated drill was only 81.5% of TiCN, and 66% of TiAlN because of its low oxidization resistance and hardness. The wearing features of TiAlN and TiCN coating were also studied by experiments and the different wear mechanisms were revealed. Finally the comparison of cutting performance was given between TiAlN and TiCN coated drills and recommendation of coating selection for drilling austenitic stainless steel was also presented. TiCN coating is suitable for HSS cutting tool base, which is often used for drilling austenitic stainless steel at low speed. TiAlN coating is appropriate for tungsten carbide cutting tool base, which is used for drilling austenitic stainless steel at high speed. The special designed drill with optimal geometrical structure plus appropriate coating can yield long tool life and high material removal rate in high-efficient drilling austenitic stainless steel.

Deep hole drilling of AISI 1045 via high-speed steel twist drills: evaluation of tool wear and hole quality

2017 ◽  
Vol 93 (1-4) ◽  
pp. 1115-1125 ◽  
Author(s):  
Sarmad Ali Khan ◽  
Aamer Nazir ◽  
Mohammad Pervez Mughal ◽  
Muhammad Qaiser Saleem ◽  
Amjad Hussain ◽  
...  
Keyword(s):  
Tool Wear ◽  
High Speed ◽  
High Speed Steel ◽  
Hole Drilling ◽  
Deep Hole ◽  
Hole Quality ◽  
Deep Hole Drilling ◽  
Aisi 1045 ◽  
Twist Drills

scholarly journals An experimental investigation of the effects of point angle on the high-speed steel drills performance in drilling

2018 ◽  
Vol 51 (9-10) ◽  
pp. 417-430 ◽  
Author(s):  
Zülküf Demir
Keyword(s):  
Surface Roughness ◽  
Tool Wear ◽  
High Speed ◽  
Thrust Force ◽  
Cutting Speed ◽  
High Speed Steel ◽  
Dimensional Accuracy ◽  
Cutting Edge ◽  
Drilling Process ◽  
Cutting Speeds

The differences in the cutting speed are a serious problem along the cutting edge of the drill, in drilling operations. This problem can partly be solved reducing the length of the cutting edge via changing the drill point angle. In addition, in this study, the effect of point angle, feed rate, and cutting speed on drilling is investigated. For identifying the optimum cutting parameters, AISI 1050 steel alloy was selected as the experimental specimen, these specimen were pre-drilled 5 mm in diameter due to eliminating the effect of the chisel edge. In the experiments, the holes were drilled only at a depth of 10 mm in order not to give any harm to the dynamometer while measuring thrust force. For this aim, in drilling process, drills with point angle of 100°, 118°, 136°, 154°, and 172° were selected. In conclusion, the thrust force, the tool wear, and the surface roughness linearly decreased with increasing point angles due to less removal chip area, in per revolve of the tool. However, the thrust force, the tool wear, and the surface roughness were adversely affected at higher feed rates and lower cutting speeds. The hole dimensional accuracy decreased at lower feed rates and cutting speeds but at higher point angles and concurrently at higher feed rates but lower point angles and cutting speeds. However, the hole dimensional accuracy showed more decisiveness at 118° than other point angles, while the highest dimensional accuracy values recorded at 136° point angle, at higher cutting speeds.

scholarly journals Optimization Drilling Parameters of Aluminum Alloy Based on Taguchi Method

2019 ◽  
Vol 14 (2) ◽  
pp. 14-21
Author(s):  
Aseel Jameel Haleel
Keyword(s):  
Surface Roughness ◽  
Taguchi Method ◽  
High Speed ◽  
Cutting Tools ◽  
Cutting Speed ◽  
High Speed Steel ◽  
Control Factors ◽  
Drilling Parameters ◽  
Tool Diameter ◽  
Twist Drills

This paper focuses on the optimization of drilling parameters by utilizing “Taguchi method” to obtain the minimum surface roughness. Nine drilling experiments were performed on Al 5050 alloy using high speed steel twist drills. Three drilling parameters (feed rates, cutting speeds, and cutting tools) were used as control factors, and L9 (33) “orthogonal array” was specified for the experimental trials. Signal to Noise (S/N) Ratio and “Analysis of Variance” (ANOVA) were utilized to set the optimum control factors which minimized the surface roughness. The results were tested with the aid of statistical software package MINITAB-17. After the experimental trails, the tool diameter was found as the most important factor that has effect on the surface roughness. The optimal drilling factors that minimized the surface roughness are (20mm/min cutting speed, 0.2 mm/rev feed rate, and 10mm tool diameter).

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