Modern Machinery (MM) Science Journal, September 2016

POSSIBILITY TO DETECT DEGRADED RECYCLED MATERIAL IN THE MOULDED PARTS FROM PP

LUBOS BEHALEK, MARTIN SEIDL, JIRI HABR
Keywords: induction oxidation time | differential scanning calorimetry | mechanical properties | rheological properties | polypropylene | recycled material

In the frame of injection moulding production process not all raw material creates the final products and a waste material is generated (defective and rejected products, cold runners, etc.). This technological waste is very often reused in production, which reduces the final production costs, however, this regrind or regranulated material affects the final properties of the part. The negative impact of (…)

SIMULATION OF TECHNOLOGICAL PROCESS BY USAGE NEURAL NETWORKS AND FACTORIAL DESIGN OF EXPERIMENTS

ALENA VAGASKA, PETER MICHAL, MIROSLAV GOMBAR, ERIKA FECHOVA, JAN KMEC
Keywords: factors | layer thickness | anodizing | predictive model | neural unit | design of experiments

The possibilities of simulation of technological process of aluminium anodic oxidation using the methodology of Design of Experiments (DOE) and theory of neural networks in order to monitor the anodizing process under various operating conditions are presented in this paper. The influence of chemical and physical input factors on the resulting AAO (anodic aluminium oxide) layer thickness at applied curr (…)

DESIGN OF ADJUSTABLE SMART VISION SYSTEM BASED ON ARTIFICIAL MUSCLE ACTUATORS

KAMIL ZIDEK, JAN PITEL, ALEXANDER HOSOVSKY
Keywords: automation | Segmentation | artificial muscles | image processing

The paper describes a proposal of positional adjustable camera system based on artificial muscles for rapidly changing products with different height and sizes on a conveyor belt. Measuring accuracy by camera system is heavily dependent on the distance of the camera system from the captured part. The ideal situation is that component occupying a largest area of the processed image. Current positioning t (…)

INFLUENCE OF SELECTED TECHNOLOGICAL PARAMETERS ON CUTTING SURFACE ROUGHNESS IN MATERIAL LASER CUTTING

LUBA BICEJOVA, SLAVKO PAVLENKO
Keywords: gas pressure | sheetmetal | surface roughness | Laser

The paper deals with the influence of the selected technological parameters on cutting surface roughness in material laser cutting. It more closely examines and compares technological parameters such as cutting speed, laser performance, and gas pressure. The paper also contains the information on influence of the respective technological parameters on character of the material surface cut by laser S235J (…)

A DEVICE DESIGNED TO MONITOR NEW BELT TYPES WITH APPLICATION OF DIAGNOSTIC SYSTEM

JOZEF MASCENIK, SLAVKO PAVLENKO, LUBA BICEJOVA
Keywords: belt gear | sensor | stand | diagnostics | motor

The presented paper deals with the alternative of determination of state of new belt types of the belt gear in case of a designed device. The developing and structural-design stage, during which realization of a testing device was performed with Autodesk Inventor program, was followed by a production technology design. An electric motor serves as a device drive and belt gear with the other electric moto (…)

ANALYSIS OF HYSTERETIC BEHAVIOR OF TWO-DOF SOFT ROBOTIC ARM

ALEXANDER HOSOVSKY, JAN PITEL, KAMIL ZIDEK
Keywords: hysteresis | joint angle | robotic arm | pneumatic artificial muscles | dynamic model

Soft robotic arm actuated with pneumatic artificial muscles (PAMs) exhibits various interesting properties (static or dynamic) in contrast to conventional robots with electric motors. In addition to nonlinear relationship between various variables, PAMs are known for the hysteresis inevitably associated with their specific construction. In order to be able to develop a model useful for designing the eff (…)

TEMPERATURE INFLUENCE ON THE CHANGE OF THE SANDWICH MATERIAL ADHESIVE PROPERTIES

JIRI SOBOTKA, PAVEL SOLFRONK, MICHAELA KOLNEROVA, LUKAS ZUZANEK
Keywords: shear resistance | temperature resistance | material tests | car-body design | sandwich material

The automotive manufacturing represents one of the most developing segments of the engineering industry. The persisting tendency of designers to achieve the best technological level, car´s safety level and also ecological running at keeping the low price level means necessity to still implement into own production new types of materials. Among these materials also belong so-called sandwich materials whi (…)

INFLUENCE OF GAS PRESSURE CHANGE ON CHARACTER OF CUTTING SURFACE IN MATERIAL LASER CUTTING

LUBA BICEJOVA
Keywords: gas pressure | sheetmetal | surface roughness | Laser

The submitted paper deals with the issue of unconventional technology of material laser cutting. The paper presents particular relations between the influence of gas pressure change and character of cutting surface after experimental measurements.[Gaspar 2013] Gas pressure change was applied in case of the selected sheetmetal thickness. The samples taken during experimental measurements were prepared in (…)

THE DEFORMATION BEHAVIOUR OF HYBRID COMPOSITE SYSTEMS WITH THERMOPLASTIC MATRIXITLE

MARTIN SEIDL, LUBOS BEHALEK, JIRI HABR, PAVEL SEHNOUTEK
Keywords: carbon fibres | glass spheres | glass fibres | mechanical properties | hybrid composites | reinforced polymer s

Hybrid polymer composites are relatively new group of plastics that are rapidly developed. These materials combine high demands on the mechanical strength while keeping minimal density, thus generally opposing properties. Hybrid polymer composites have potentially very wide applicability, especially in aircraft or automotive industry where weight of the components is one of the critical parameters In th (…)

AUTOMATIZATION PROCESS OF DESIGNING THE TECHNOLOGICAL DOCUMENTATION BY TOOLS OF COMPREHENSIVE CAD-CAM-CAE SYSTEM

MARTIN POLLAK, PETR BARON, JOZEF ZAJAC
Keywords: generation | process documentation | NC program | automated processing

The article describes an automated production of process documentation in an environment of PTC Creo 3.0. Process documentation is a simplified form of technological documentation, which is directly generated in the environment of comprehensive CAD-CAM-CAE system. Creation of process documentation is based on design of the templates that contain all the necessary information to ensure a smooth productio (…)

EVALUATION OF THE IMPACT OF PRODUCTION PARAMETERS ON THE FINAL PROPERTIES OF THE PART MADE OF NYLON 12 WITH RAPID PROTOTYPING TECHNOLOGY (FDM)

JIRI SAFKA, MICHAL ACKERMANN, MARTIN SEIDL, LUBOS BEHALEK, JIRI BOBEK, JAKUB KLUNEJKO
Keywords: tensile test | nylon 12 | fused deposition modelling

Nylon is a widespread polymer material employed primarily for engineering applications. Its rheological behavior is suitable for a wide range of manufacturing techniques which produce parts with very specific properties. Representatives of prototype systems are included among these production technologies and this article is focused especially on 3D printing. FDM technology, that allows processing of ny (…)

EXPERIMENTAL MONITORING AND DIAGNOSTICS OF BELT GEARS IN TESTING DEVICE

JOZEF MASCENIK, IMRICH VOJTKO
Keywords: device | diagnostics | monitoring | belt gear

Constant development in mechanical engineering increasingly employs machines with high frequency revolutions requiring high efficiency and noiseless running and thus qualitative demands laid for belt gears increase as well. A new device for measuring and diagnostics of belt gears was designed to realize experimental measurements. Measurements can determine, for instance, slip of a V-belt expressed by t (…)

MONITORING OF THE MACHINE MILKING PROCESS WITH APPLICATION OF INFRARED THERMOGRAPHY

PETR JUNGA, PETR TRAVNICEK, JURAJ RUZBARSKY
Keywords: surface temperature | machine milking | infrared thermography | monitoring

The paper is focused on monitoring of the machine milking process by infrared thermography method. The goal of the paper is thermography monitoring of the influence of machine milking on the udder and teats surface temperature and statistics valuation of measured values. Our study claimed suitability of IRT method for monitoring of machine milking. Statistical evaluation claimed statistically significan (…)

INFLUENCE OF THE PRESSURE TANKS REPEATED ENAMELING ON THE BASIC MATERIAL DEGRADATION

IVA NOVAKOVA, JAROMIR MORAVEC
Keywords: mechanical properties | Structure | annealing | heat treatment | steel | enamel

Pressure tanks with the enamel surfaces play an important role mainly in the food industry and pharmacy. As the best advantage of these enamels there is very good resistance against aggressive environment at keeping the required mechanical properties of low-alloyed steels which are used for these applications. Enameling is generally applied as several particular layers whereas every of these layers has (…)

MONITORING OF PRODUCTION QUALITY FOR PLASTIC COMPONENT

JOZEF DOBRANSKY, FRANTISEK BOTKO, EVA VOJNOVA
Keywords: capability | injection molding | quality indicators | measuring system | production

Presented article is focused on monitoring of plastic component production, which is used in automotive industry. Quality of products depends on inspection of production process and thus is essential to use all available control methods. Two methods were used for evaluation of monitoring. First method is verification of measuring system capability, using measuring system analyze. Subsequently was assess (…)

PROTOTYPE DEVELOPMENT OF A UNIQUE SERIAL KINEMATIC STRUCTURE OF MODULAR CONFIGURATION

JOZEF SVETLIK, MIROSLAV STOFA, MARTIN PITUK
Keywords: design optimization | serial kinematics | construction design | modular structure

The authors are working closely the development of the prototype a unique serial kinematic structure of modular configuration. The prototype is developed in accordance with innovative ideas to develop a rotary linkage unlimited angle of rotation as the basic structural unit for such a kinematic motion structure. After verification of the prototype would be a proprietary idea of Universal Rotary Model (U (…)

VARIANCES OF THE MECHANICAL PROPERTIES OF FILLED POLYMER MATERIALS IN A VARIATION OF INJECTION MOULDING INPUT PARAMETERS

VACLAV CONTOS
Keywords: mesh | FEM | structural analysis | rheology | injection moulding | fiber orientation

Continuum (filled polymer) is inhomogeneous and anisotropic. The Continuum is used in an injection moulding simulation at first (generally unnewton type of fluid). Then the continuum is solid (after cooling) and it is possible to carry out ordinary structural analysis with it. The solid continuum has different mechanical properties for each of discrete elements. A consequent stress field will generally (…)

DETERMINITATION OF RELATION BETWEEN INFLUENCE OF LASER PERFOMANCE CHANGE AND CUTTING SURFACE CHARACTER IN LASER CUTTING TECHNOLOGY

SLAVKO PAVLENKO
Keywords: performance | sheetmetal | surface roughness | Laser

The introduction of the submitted paper describes theoretical foundations of material laser cutting technology. The core analyses direct relation between influence of laser performance and cutting surface character when the cutting material thickness changes. The experimental measurements applied material S235JRG2 (according to EN 10025/90+A1/93) with thickness of 3 mm, 4 mm, 6 mm, 8 mm and 10 mm. The c (…)

SUSPENSION SYSTEM IN AUTOMOBILE SYSTEM

ANNA SMERINGAIOVÁ, IMRICH VOJTKO, BARBARA LESKOVA
Keywords: dynamic model | Simulation | modeling | suspension system | car

This paper is aimed on the possibility of modeling, simulation and diagnostics of the suspension system of passenger cars. A simplified dynamic model of the car suspension system is defined. The model transformation into the Matlab – Simulink environment is described for the purpose of suspension system performance analysis. Following are examples of modeling and simulation of vehicle suspension in Auto (…)

EXPERIMENTAL DETERMINATION OF CUTTING SPEED INFLUENCE ON CUTTING SURFACE CHARACTER IN MATERIAL LASER CUTTING

JOZEF MASCENIK
Keywords: cutting speed | sheetmetal | surface roughness | Laser

In industrial practice the material laser cutting is extensively used for rather accurate and high-quality cutting of both metal and non-metal materials. The objective of the submitted paper is to point out direct relation between influence of cutting speed and surface character of material cut by laser. Cutting speed ranks among the most significant technological parameters in laser cutting and represe (…)

MODEL OF INTEGRATED COMPREHENSIVE MAINTENANCE SYSTEM

ADAM ZILINSKY, JOZEF SVETLIK
Keywords: diagnostics | machine | comprehensive | integrated | maintenance

In terms of practice, maintenance is carried out to ensure the desired reliability of production systems so that the total cost of the operation of such systems are the lowest. Article describes the benefits and advantages of the integration of complex system maintenance and example of its application. The main objective is familiar with the problems of maintenance and failure of machinery and equipment (…)

TORQUE CHARACTERISTICS OF ROTARY PNEUMATIC MUSCLE ACTUATOR

MILAN BALARA, MARIA TOTHOVA
Keywords: torque characteristic | stiffness | antagonistic connection | artificial muscle | pneumatic muscle actuator

The control of the standard pneumatic muscle actuators is provided by increasing the air pressure in the one artificial muscle, while reducing the pressure in the second (antagonist) artificial muscle. The paper contains information about the control and basic properties of the rotary actuator based on pneumatic artificial muscles. It presents equations for the values of the actuator arm displacement de (…)