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Measurements of Temperature of CNC Machine Tool Ball Screw Utilising IR Method

thermal expansion on thermally induced error of ball screw feed drive system of precision machine tools . – Int. J. of Adv. Manuf. Technol., vol.82, pp.1693–1705. [7] Maldague X. (1994): Infrared methodology and technology . – Amsterdam: Gordon and Breach Science Publishers. [8] Raznjevic K. (1964): Heat transfer charts with graphs: numerical data in units of technical and international system. – Warsaw: WNT. [9] Vollmer M. and Möllmann K.-P. (2010): Infrared thermal imaging . – Weinheim: Wiley-VCH. [10] Minkina W. and Dudzik S. (2009

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Analysis of the Forming Process of Conical-Like Helical Surfaces with Roller Tools

Abstract

The article presents a methodology of an analysis and modeling of technological systems and the grinding process of conical-like helical surfaces with the use of modern CAD/CAE systems and calculations in the Matlab system. The methodology developed allows one to carry out simulation tests for the accuracy of the grinding process of helical surfaces taking into consideration the deviations of the location and shape of the system’s elements, axial and radial striking the spindle of the workpiece machined and the grinding wheel as well as the tool’s geometrical features.

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Influence of Cooling Lubricants on the Surface Roughness and Energy Efficiency of the Cutting Machine Tools

Abstract

The Technical University of Liberec and Brandenburg University of Technology Cottbus-Senftenberg investigated the influence of cooling lubricants on the surface roughness and energy efficiency of cutting machine tools. After summarizing the achieved experimental results, the authors conclude that cooling lubricants extensively influence the cutting temperature, cutting forces and energy consumption. Also, it is recognizable that cooling lubricants affect the cutting tools lifetime and the workpiece surface quality as well. Furthermore, costs of these cooling lubricants and the related environmental burden need to be considered. A current trend is to reduce the amount of lubricants that are used, e.g., when the Minimum Quantity Lubrication (MQL) technique is applied. The lubricant or process liquid is thereby transported by the compressed air in the form of an aerosol to the contact area between the tool and workpiece. The cutting process was monitored during testing by the three following techniques: lubricant-free cutting, cutting with the use of a lubricant with the MQL technique, and only utilizing finish-turning and finish-face milling. The research allowed the authors to monitor the cutting power and mark the achieved surface quality in relation to the electrical power consumption of the cutting machine. In conclusions, the coherence between energy efficiency of the cutting machine and the workpiece surface quality regarding the used cooling lubricant is described.

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The Matlab Toolbox for Modeling Complex Mechanisms

References ABB (2011): RobotStudio: of offline robot programming for ABB robots. - http://www.abb.com. Bingul Z., Koseeyaporn P. and Cook G.E. (2002): Windowsbased robot simulation tools. - 7th International Conference on Control, Automation, Robotics and Vision, Singapore. Bruyninckx H. (2001): Open robot control software: the OROCOS project. - IEEE International Conference on Robotics and Automation (ICRA), pp.2523-2528. Corke P.I. (1996): A robotics toolbox for MATLAB. - IEEE Robotics and

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Finite element simulation and experimental validation of the effect of tool wear on cutting forces in turning operation

1 Introduction Tool wear influences tool life, machining cost, and most importantly the machining quality. Thus a quantitative study of cutting forces is essential for tool life estimation and tool condition monitoring. Initially, experimental methods and analytical methods were used to study cutting forces. D’Mello et al . [ 1 ] investigated the effects of flank wear, cutting parameters, and tool vibrations on the surface roughness during high-speed turning of Ti–6Al–4V. Ning et al . [ 2 ] devised a set of turning experiments with tool inserts having

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Identification of Heredity Kernels and Their Influence on the Life Time of Glass/Polyester Composites

Abstract

One of the major problems encountered in prediction of hereditary viscoelastic behavior of polymeric composites is the determination of heredity kernels. This issue comes down to identification of the model characterizing the viscoelastic properties of these materials. The purpose of this work is to propose a model for prediction of viscoelastic nonlinear behavior of laminate composite with polyester matrix, through the study and analysis of heredity kernels and their influence on the life time of this material. Identification of this model required experimental determination at room temperature, of viscoelastic parameters of heredity kernels by macroscopic approach. These data provide predictive tools for establishment of the life time and long term stress limit under static complex loading for this type of material.

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Turning operation of AISI 4340 steel in flooded, near-dry and dry conditions: a comparative study on tool-work interface temperature

1 Introduction In the present day manufacturing environment, machining operations are inevitable in producing finished products. In any machining operation involving metal cutting, the usage of lubricants plays a vital role in maintaining favourable manufacturing conditions [ 1 ]. The favourable manufacturing conditions are a combination of certain process parameters and conditions, due to which best quality machine components are produced [ 2 , 3 ]. Above 95% of gross energy sustained to the machine tool is changed over into heat, because of the relative

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Numerical Studies of Nonlinear Gearing Models Using Bond Graph Method

Abstract

The present paper is dedicated to computer simulations performed using a numerical model of a one-stage gear. The motion equations were derived utilizing the bond graph method. The formulated model takes into consideration the variable stiffness of toothings as well as an inter-tooth clearance which has been represented via discontinuous elements with so called dead zones. As a result of these assumptions, the nonlinear model was obtained which enables representation of the dynamic phenomena of the considered gear. In the paper, an influence of errors of gear wheels’ co-operation on the character of excited dynamic phenomena was studied. The methodology of the analyses consists in utilization of the following tools: color maps of distribution of the maximal Lapunov coefficient and bifurcation diagrams. Based upon them, the parameters were determined, for which the Poincare portrait represents a structure of the chaotic attractor. For the identified attractors, the initial attractors were calculated numerically - which along with the changes of the control parameters are subjected to multiplication, stretching or rotation.

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Optimization of Process Parameters of Edge Robotic Deburring with Force Control

] Burghardt A., Kurc K., Muszyńska M. and Szybicki D.: Robotic position to verify the machining proces s. – Modelowanie inżynierskie, vol.21, No.52, pp.23-29. [5] Hendzel Z., Burghardt A., Gierlak P. and Szuster M. (2014): Conventional and fuzzy force control in robotised machining . – In Solid State Phenomena, vol.210, pp.178-185. [6] Odham A. (2007): Successful robotic deburring is really a matter of choices . – Tool Prod Mag. [7] Shiakolas P.S., Labalo D. and Fitzgerald J.M. (1999): RobSurf: A Near Real Time OLP System for Robotic Surface Finishing

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