Applied Mechanics and Materials Vol. 474

Abstract: In the paper is presented information about common and advanced materials used for manufacturing of products by Fused Deposition Modelling (FDM) rapid prototyping technology. In different rapid prototyping technologies the initial state of material can come in either solid, liquid or powder state. The current range materials include paper, nylon, wax, resins, metals and ceramics. In FDM are mainly used as basic materials ABS - Acrylonitrile Butadiene Styrene, polyamide, polycarbonate, polyethylene and polypropylene. Main part of the paper is focused on experimental production and testing of composite material produced by rapid prototyping realized by Fused Deposition Modelling (FDM) method and presents outputs of testing of ABS/glass texture material realized by authors.

Abstract: In this paper, a Lagrangian finite element-based machining model is applied in the simulation of cutting forces in two-dimensional orthogonal cutting of titanium Ti-6Al-4V alloy. The simulations were conducted using 2D Finite Element Method (FEM) machining simulation software. In addition, the cutting experiments were carried out under the different cutting speed, feed and tool geometry (rake angle, clearance angle and cutting edge radius). The effect of cutting speed, feed and tool geometry on cutting force were investigated. The results obtained from the finite element method (FEM) and experimental studies were compared.

Abstract: Goal of the paper was to investigate stress state and contact pressures in contact pair of tribological assembly by numerical simulation. This paper deals with simulation of cylindrical contact pair. One part has convex (shaft) and other one concave (hole) surface of the body. This assembly represents friction state of the plain cylindrical journal bearing. The paper includes results of stress state and contact pressures from two loading states. The first loading state includes only radial loading without effect of the torque moment and the second one includes radial loading with torque moment. If we want to know more about tribological processes we will have to know stress state in the materials loaded through contact interaction between two bodies to the last detail. This level of knowledge can be achieved just by numerical simulation. The simulation was made by CAE system ANSYS.

Abstract: Nowadays, big expansion and innovation are emerging in all development area of technologies and technological devices. Probably industrial robots and manipulators belong to development too. Industrial robots and manipulators belong to progressive elements of automation. At present industrial robots and manipulators are used for manipulation with various types of objects. The proper using of gripper that creates important task in manipulation in term of object grasp and choose of right type of gripping jaws it is possible to manipulate with object that are fragile and soft. However at this time is very important check of the all time of the process assembly and disassembly in each time. The current information about automation process assembly or disassembly are evaluation to the control unit system.

Abstract: Article deals with design of adaptive control system for drilling process of aerospace critical components. The system proposed in this paper is directed towards real the time control of surface roughness parameter Ra. Proposed model for monitoring and control consists of surface roughness prediction system and decision making subsystem. The artificial neural network was employed to calculate surface roughness parameter Ra through of process monitoring indices such as torque Mz, force Fz, power P and cutting conditions feed f, cutting speed v_c. Test samples were nickel based super alloy Udimet 720 used as a basic constructional material of discs for gas turbine engines.

Abstract: The paper deals with the effects of clamping forces on the workpiece during clamping fixture. It describes an experiment using numerical simulation. With numerical experiments we wanted to find out displacement of basic points of the model and changes in the reaction forces in contact points. In the experiment it was considered with initial inaccuracies of contact points. Verification of their effect was made on simulation models of workpieces, which were made in software ANSYS. The creation of the model was used finite element method.

Abstract: This paper deals with a methodology of identifying surface quality when endball milling form surfaces which are applied in tool making. This methodology was developed for the 3D milling process and it consists of following parts as design of the samples, surface milling and checking surfaces with different sequence of radii ratio. That sequence was used to model real form surfaces applied in tool making. Based on the defined measurability of the surface roughness, two milling strategies have been applied to produce radii sequence. In order to prevent undesired cusp formation in the 3D milling, the response surface methodology and statistical analysis are used to evaluate surface quality.

Abstract: The contribution deals with experimental determination and mathematical modeling aimed to describe complex machine aggregates working under dynamic conditions. Measured parameters allowed to deduce the generalized Kloss characteristics for nominal operational speeds of 1,450 min^-1, 1 000 min^-1 and 720 min^-1 under the sinusoidal excitation. The steady-state motion is conveniently reinterpreted as an ellipse centered at the working point. Working point is given as the intersection of moment characteristics of the asynchronous motor with the loading characteristics of DC motor with separate excitation. The results of measurements show, that it is necessary to consider the linear dynamic characteristics especially for dynamic response computations near to the resonance.

Abstract: Based on the experiments there was investigated the tool life of various kinds of cutting materials by hard machining. Taylor equations can be used for the cutting conditions setting. The measured values of surface roughness, residual stresses and microhardness show possibility of hard machining usage in practice. In case of the white layer zone appearance this needs to be eliminated by superfinishing. The ceramic and CBN wiper inserts are the objects of further research.

Abstract: Given contribution deals with a group technology and methods of classification of the components. Author proposed a component base for CNC processing center EMCO Concept TURN 105, which is a part of manfucturing system iCIM 3000 by FESTO. Designed manufacturable components are coded and classified based on shape similarity.