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Burr Height

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A. C¸ Icekc M. Perc¸ Ina, K. Aslantas A,∗, I˙. Ucuna, Y. Kayna – 1st expert on this subject based on the ideXlab platform

  • Micro-drilling of Ti – 6Al – 4V alloy : The effects of cooling / lubricating
    Precision Engineering, 2016
    Co-Authors: A. C¸ Icekc M. Perc¸ Ina, K. Aslantas A,∗, I˙. Ucuna, Y. Kayna

    Abstract:

    This paper presents a series of experimental investigations of the effects of various machining conditions [dry, flooded, minimum quantity lubrication (MQL), and cryogenic] and cutting parameters (cutting speed and feed rate) on thrust force, torque, tool wear, Burr formation, and surface roughness in micro-drilling of Ti–6Al–4V alloy. A set of uncoated carbide twist drills with a diameter of 700 m were used for making holes in the workpiece material. Both machining conditions and cutting parameters were found to influence the thrust force and torque. The thrust force and torque are higher in cryogenic cooling. It was found that the MQL condition produced the highest engagement torque amplitude in comparison to the other coolant–lubrication conditions. The maximum average torque value was obtained in the dry drilling process. There was no substantial effect of various coolant–lubrication conditions on Burr Height. However, it was observed that the Burr Height was at a minimum level in cryogenic drilling. Increasing feed rate and decreasing spindle speed increased the entry and exit Burr Height. The minimum surface roughness values were obtained in the flood cooling condition. In the dry drilling process, increased cutting speed resulted in reduced hardness on the subsurface of the drilled hole. This indicates that the surface and subsurface of the drilled hole were subject to softening in the dry micro-drilling process. The softening at the subsurface of drilled holes under different cooling and lubrication conditions is much smaller compared to the dry micro-drilling process.

Alisson Rocha Machado – 2nd expert on this subject based on the ideXlab platform

  • Burr Height minimization using the response surface methodology in milling of ph 13 8 mo stainless steel
    The International Journal of Advanced Manufacturing Technology, 2016
    Co-Authors: Luiz Carlos Da Silva, Paulo Rosa Da Mota, Marcio Bacci Da Silva, Wisley Falco Sales, Alisson Rocha Machado, Mark J Jackson

    Abstract:

    Burrs formed during the machining process is considered a major problem in the manufacturing industry because they can impair mechanical assemblies, change the dimensions of the machined products, and compromise the physical integrity of the operators, among many other inconveniences. Therefore, Burrs should be avoided but if formed their dimensions should be minimized. In this work, the Burr dimensions were investigated, and the cutting conditions that minimize them were determined using a central composite design (CCD) and response surface methodology (RSM) in face milling of PH 13-8 Mo stainless steel with coated carbide inserts. Burr formed on the workpiece exit edge and the behaviors of its Height during the manipulation of the evaluated variables (tool exit angle from the workpiece, cutting speed, feed per tooth, axial depth of cut and average tool flank wear) were analyzed. The Burrs were indirectly measured, where replicas of the workpiece edges (with their Burrs) were produced with condensed silicone. The results showed that there is a considerable reduction in the Burr Height when lower exit angles and new cutting tools are used. The minimum number of Burrs is produced when using increasing feed per tooth and decreasing axial depth of cut. The cutting speed presented negligible influence on the Height of the Burr.

  • study of Burr Height in face milling of ph 13 8 mo stainless steel transition from primary to secondary Burr and benefits of deBurring between passes
    Cirp Journal of Manufacturing Science and Technology, 2015
    Co-Authors: Luiz Carlos Da Silva, Paulo Rosa Da Mota, Marcio Bacci Da Silva, E O Ezugwu, Alisson Rocha Machado

    Abstract:

    Abstract Undesirable Burrs formed in virtually all machining processes are wastes that hinder the assembly of mechanical components, alter the dimensions of the machined products and are harmful to machine tool operators. They are present in both macro and micromachining and severely affect precision of the machined components. In order to make important decisions towards reduction or complete elimination of Burrs, it is essential to determine the size of the Burr and its behavior when the cutting conditions are altered. This study involves face milling of PH 13-8 Mo stainless steel with coated carbide inserts and complement a recent work [1] that studied the influence of the cutting fluid application method, the cutting tool geometry and the radial depth of cut on Burr dimensions. In the present work, the transition from primary to secondary Burr and influence of the accumulated remnant Burr between passes on the Burr size were analyzed. The transition from primary Burr to secondary Burr depends considerably on the radial and axial depths of cut. Remnant Burr Height increases linearly as the number of passes increases.

  • Study of Burr Height in face milling of PH 13-8 Mo stainless steel––Transition from primary to secondary Burr and benefits of deBurring between passes
    Cirp Journal of Manufacturing Science and Technology, 2015
    Co-Authors: Luiz Carlos Da Silva, Paulo Rosa Da Mota, Marcio Bacci Da Silva, E O Ezugwu, Alisson Rocha Machado

    Abstract:

    Abstract Undesirable Burrs formed in virtually all machining processes are wastes that hinder the assembly of mechanical components, alter the dimensions of the machined products and are harmful to machine tool operators. They are present in both macro and micromachining and severely affect precision of the machined components. In order to make important decisions towards reduction or complete elimination of Burrs, it is essential to determine the size of the Burr and its behavior when the cutting conditions are altered. This study involves face milling of PH 13-8 Mo stainless steel with coated carbide inserts and complement a recent work [1] that studied the influence of the cutting fluid application method, the cutting tool geometry and the radial depth of cut on Burr dimensions. In the present work, the transition from primary to secondary Burr and influence of the accumulated remnant Burr between passes on the Burr size were analyzed. The transition from primary Burr to secondary Burr depends considerably on the radial and axial depths of cut. Remnant Burr Height increases linearly as the number of passes increases.

B. Siddeswarappa – 3rd expert on this subject based on the ideXlab platform

  • Taguchi optimization in drilling of AISI 316L stainless steel to minimize Burr size using multi-performance objective based on membership function
    Journal of Materials Processing Technology, 2008
    Co-Authors: V. N. Gaitonde, S.r. Karnik, B. T. Achyutha, B. Siddeswarappa

    Abstract:

    Abstract Burr in drilling plays an important role on product quality and hence it is essential to minimize the Burr size at the production stage. This paper presents the application of Taguchi optimization method for simultaneous minimization of Burr Height and Burr thickness influenced by cutting conditions and drill geometry. The approach of Taguchi design for drilling optimization problem is based on multi-performance objective, which employs the membership functions. In the present work, optimal values of cutting speed, feed, point angle and lip clearance angle are determined for selected drill diameter values to minimize Burr Height and Burr thickness during drilling of AISI 316L stainless steel workpieces. The effectiveness of the proposed approach is demonstrated through simulation results and experimental verifications.

  • Genetic algorithm-based Burr size minimization in drilling of AISI 316L stainless steel
    Journal of Materials Processing Technology, 2008
    Co-Authors: V. N. Gaitonde, S.r. Karnik, B. T. Achyutha, B. Siddeswarappa

    Abstract:

    Abstract This study investigates the application of genetic algorithm (GA) for Burr size minimization in drilling of AISI 316L stainless steel using HSS twist drills. Experiments were planned as per central composite rotatable design of experiments. The second order mathematical models for Burr Height and Burr thickness were developed using response surface methodology (RSM) with cutting speed, feed, drill diameter, point angle and lip clearance angle as affecting parameters. The developed RSM models were then employed with GA, which is a search algorithm based on natural selection and natural genetics, to determine the optimal process parameters for a given drill diameter that results in minimum Burr Height and thickness. The simulation results reveal that point angle and cutting speed have significant effects in minimizing Burr size.

  • Methodology of Taguchi optimization for multi-objective drilling problem to minimize Burr size
    The International Journal of Advanced Manufacturing Technology, 2007
    Co-Authors: V. N. Gaitonde, S.r. Karnik, B. T. Achyutha, B. Siddeswarappa

    Abstract:

    Formation of exit Burr on part edges during drilling has several undesirable features with regard to product quality and functionality. Hence it is essential to select optimum drilling process parameters to minimize Burr size at the production stage. This paper presents the application of the Taguchi optimization method for simultaneous minimization of Burr Height and Burr thickness influenced by cutting conditions and drill geometry. The Taguchi design approach to the multi-objective optimization problem is based on the introduction of a new concept of fitness function for each trial of orthogonal array. The fitness function is derived through mapping the objective functions of the drill optimization problem. In the present work, optimal values of cutting speed, feed, point angle and lip clearance angle are determined for selected drill diameter values to minimize Burr Height and Burr thickness during drilling of AISI 316L stainless steel workpieces. The details of experimentation, analysis of means and analysis of variance are presented in the paper.