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The issues of temperature measurements directly from a weld pool and a weld are discussed. Problems occurring while measuring with thermocouples are shown. The issues of thermal and derivative analysis are discussed. Thermal and derivative analysis applications to research into welding technology are reviewed.
A characteristic feature of ceramic materials is their little consumption as well as a low friction coefficient in contact with other materials at a presence of a lubricant. The latest world trends as regards the machine construction, in particular piston machinery, are aiming at reducing its lubrication and cooling. Thus, a question arises, what the upper layer of a ceramic material should be like...
Titanium alloys are characterised by a poor wear resistance when interacting with other construction materials, and by a great tendency to become scuffed. Laser alloyed surface layers, due to forming hard ceramic particles spaced in ductile matrix, have a lower wear intensity as compared to conventional alloys and enables application of titanium alloys as a part of tribological couple. The aim of...
Paper presents a modeling technique of cutting process using multitooth rotating tools which utilizes NURBS (NonUniform Rational B-Spline) curves and surfaces. These models can model complex surfaces often encountered in 5-axis machining. Cutting edges geometry is modeled using B-spline curves whereas the workpiece is described by the NURBS surfaces. Geometry of the undeformed chip is determined by...
The goal of this paper is to present a new method that ensures stiffness of the mechanical characteristic of the direct current motor servo drive, which means lack of influence of the varying load torque on quality of the velocity control. Additionally, usage of the new MFC-V (Model-Following Control for Velocity control) system allows one to shape the servo drive transient response, ensuring, among...
Application of a mechatronic system to improve the effectiveness of the position/force control for industrial manipulators is discussed in the paper. Owing to high stiffness of the kinematic chain and variable environment stiffness, there is a need to employ advanced control systems in order to provide stable force control. The concept proposed and presented in the paper is meant for use with a 6DOF...
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