This article gives an outline of the progress of work on the Study of UWB (University of West Bohemia) test bench for partly-suspended and fullysuspended variants of individual wheelset traction drives. First, a survey of existing designs of roller test benches was conducted. Its outcomes supported the idea of designing a completely new device. The main part of the article is devoted to the design of th (…)
The article focuses on the methods for evaluating wear of two types of saw blades. One type does not have sintered carbide plates and another are the plates soldered on. The article also addresses application of various methods with respect to increase the life of saw-blade teeth. Gradual wear of saw blade cutting knives gives rise to certain phenomena, which have impact on the whole process of cutting. (…)
The paper deals with the analysis of the proportional control of a discrete process in a transport robot model. The issue was addressed by determination of relationships between individual external and internal variables and parameters of the process. The gained results provide abetter understanding of the relations which will lead to better results in bigger and more complex processes. Such results (…)
Basic information on the extraction-production process, including felling, skidding, handling and transport of wood, which is fully mechanized and automated. The aim of the article is to highlight the technical equipment and new possibilities in timber skidding. It covers general information, technical and dimensional specifications of machinery for skidding with or without choker. The paper analyses th (…)
The submitted paper deals with an analysis of machinery tools for forest cultivation and the way of wear of their functional parts. It analyses the state of tools of crusher of undesirable advance growth, which are exposed mainly to abrasive and fatigue wear in operation. On damaged tools – teeth, the effect of wear and mechanical and structural properties of teeth materials of different construction re (…)
The research in the technology of production of die castings from hypoeutectic silumin which are nowadays deeply implemented in the rapidly developing automobile, shipping and airline industry aims to increase the manufacture and quality properties of the castings. A higher attention is paid to die castings inner quality which is characterized by a type and range of casting-related defects. In accordanc (…)
The main aim of planning suitable maintenance interventions during operation of the technical equipment is to prevent a failure creation. Adequate maintenance of its individual elements can prevent the development of major failures, but also significantly increase the reliability and extend the service life. In general, the removal of a major failure of technical equipment is very much costly, but also (…)
The paper deals with observation and description of the influence of strain rate on true stress - true strain. It compares various material models that consist strain rate for deep-drawing sheets in order to work out the most accurate material models. The more accurate input to the simulation program, give the more exact output. These simulation programs introduce higher accuracy into development and pr (…)
When using the method of processing materials by a plasma beam it is necessary to know the specific requirements for quality and economy of cutting. Vibrations occur during this process, which can have a negative effect on lifespan of the machine. Therefore currently there is greater emphasis on exploring the effects causing these vibrations. The goal of this paper is to analyze and consider the effect (…)
The article describes the application of tools of technical diagnostics of bearings in device for the production of cellulose due to previous difficult disorder of device. Diagnostics of bearings is a very challenging area of operational diagnostics. Bearing damage may be caused by various factors such as the action of excessive forces, unsuitable lubricant, contamination of the lubricant, the lubricant (…)
NOx formation is one of the main ecological problems nowadays as nitrogen oxides is one of main reasons of acid rains. Nitrogen oxides (NOx) are formed as a result of oxidation of nitrogen which occurs in the air and in a fuel.The aim of this work is to research the formation of NOx in combustion of gaseous fuels. The ANSYS model was designed according to the calculation to provide full combustion and g (…)
The contribution examines the effects of the electrolyte chemical composition on the resulting AAO layer thickness, which is one of the main indicators of corrosion protection of aluminium parts and which also favourably affects mechanical properties of component surfaces. For comparison purposes, there were selected the electrolytes comprising sulphuric acid and sulphuric acid with sodium chloride. Ano (…)
The paper deals with the theoretical and practical aspects that are necessary for identifying of modal parameters of the gear wheel as a component of the planetary gear mechanism, which are basic for the dynamic analysis. The paper presents thematically integrated part of the results of numerical and experimental modal analysis conducted on a particular gear wheel. The paper aimed to create experimental (…)
The goal of this paper is to point out the possibility of occurrence of vibration during milling due to changing depth of removed layer of the material. Growth of values of mechanical vibration in depending on the value of the nominal thickness of the splinter was monitored during changing technological parameters of the milling process due to rotation speed of the engine. The results of the experimenta (…)
Using virtual reality nowadays not only includes applications in the entertainment industry as well as use in areas in which have not yet penetrated. Such area is the manufacturing process. Due to hardware that has been designed a priority for entertainment purposes can be realized serious simulation. Measurement of various parameters during the manufacturing process and after, helped by the creation of (…)
Industrial development in the 20th century brought environmental pollution, which includes also the water. Industrial activity, especially metallurgical and engineering industry brings pollution by heavy metals. These substances act on living organisms toxic, therefore the individual components of the environment are strictly monitored. Current research of heavy metals removal is intended for the use of (…)
Severe temperature load of engine oils effects their relatively rapid thermo-oxidation. Some types of combustion engines cause, a particularly high permanent temperature load of engine oil. Gas combustion engines of cogeneration units of biogas plants are also operated in a similar way. These combustion engines operate for long periods at full load and constant speed. Biogas produced by fermentation of (…)
The design of the inlet system has been regarded as a major factor in the internal homogeneity of the casting. Being designed correctly, the system should ensure the proper and continuous filling of the mold cavity. Continuous filling of the cavity gives the initial prerequisite for internal soundness and homogeneity of the casting reflected in its quality and mechanical properties. The paper deals wit (…)
Reliability and safety of technical equipment has an important role in engineering practice. Determining of reliability of complicated technical equipment requires complex analysis and thorough preparation of inputs which means processing of great volume of information. On the basis of available information about operation and records about character of failures of observed equipment, it is possible by (…)
Nowadays die-casting is one of the best of metal casting system. Die-casting comparing with the other casting methods is cost preferably, the savings may be 20% of the metal needed for the casting and cost savings of foundry production can be around 30%. In this work we have measure hardness of Al-Si alloy respect to its Fe content. In our experiments we have used digital microhardness tester CV - 400D (…)
The paper deals with the assessment of significance impact of selected technological parameters in Wire Electrical Discharge Machining on final quality of machined surface in terms of surface roughness. For determining the significance of impact of the individual technological parameters was used the statistical method Design of Experiments which is conventionally used for mathematical modelling the imp (…)
Creep-resistant martensitic steel X10CrWMoVNb9-2 (P92) is suitable for high-temperature application used in the ultra-supercritical (USC) power plants at temperatures within the limits from 600 to 620°C and pressures about 26 MPa. It is steel alloyed with vanadium and with controlled content of boron and nitrogen. The aim of this paper is to describe how can be optimized welding processes by means of th (…)
The presented paper deals with the examination of the mold cavity filling process for the production of lightweight plastic profiles from material PE TIPELIN 7100S applying the technology of extrusion into the mold. The principle of the extrusion technology and the carrying out of the experiments are determined in the introductory parts. The following parts focus on the analysis and evaluation of the mo (…)
Probably every organisation focuses on obtaining very significant market positions in their field of business. The production for customers is overriding for it. However, meeting this goal is preceded by its production. Now the preparation of production is sometimes on the edge of the interests of its staff, although it is now scientifically strengthened, e.g. in the field of maintenance or materials. T (…)
The article introduces accuracy analysis results of additive technique used for manufacturing of parts depending on the used Rapid Prototyping technology. The main goal of the research was to complexly analyse dimensional and shape accuracy of parts manufactured by means of the selected 3D printers, and to compare the obtained results with the parameters given by the printer manufacturers. Devices such (…)
The article deals with the application of risk analysis methods to the problems of the drinking water supply by public water supply systems. The examples of a risk analysis and the prioritization of proposed corrective measures are demonstrated on the example of a small municipal water supply system. Within the project WaterRisk a detailed methodology for risk analysis of public water systems was develo (…)
The article deals with the maintenance and technical diagnostics of machine tools. The basic knowledge about maintenance, distribution of maintenance and also important facts about the diagnostics are provided. Attention is focused on the possibility of using technical diagnostics as an instrument to improve maintenance. Article is describing an experiment in the engineering company. It proceeds from th (…)
The article is aimed at verifying the state of a real workplace using virtual reality. In analyzing the readiness of virtual reality applications,augmented reality was selected for the following work. The most significant advantage of augmented reality is the implementation of a virtual model and the ability to deal with the analysis in a real environment, which is particularly beneficial in the case of (…)
This paper describes progress of project focused on health management and occupational safety of firefighter units’ members, especially from thermal exposition point of view. After introduction is described evolution of design of the proto-types of a pocket personal measurement device. The next part deals with the selection of precise temperature, humidity and body activity sensors. Attention is also gi (…)
The operational modal analysis (OMA) can be employed in the field of machine tools to measure the dynamic behaviour under operation conditions to observe and assess effects that only occurring during process. However, OMA requires an broadband excitation with preferably white noise characteristic. When assuming that the machining process is the main excitation source in machine tools, this requirement c (…)
This paper presents the limitations of classicalShewhart control charts and some possibilities of statistical process control that can be used when the basic assumptions about data have not been fulfilled. These basic assumptions that must be met include mainly a requirement on the normality of the data, the requirement for constant mean and variance, and last but not least the requirement for mutual in (…)
Experience shows that with the exception of international manufacturing organizations operating in Slovakia and some national manufacturers, new trends, methods and information regarding quality management are rejected. Our goal is, with the help of the Kaizen method, to use acquired information from practice and available theoretical resources and to suggest approaches that can lead to a more flexible (…)
Reliability centred maintenance (RCM) is the method which is used for the selection of maintenance programme that can effectively achieves the required safety, standby and economy of operation. This contribution is focused on this sophisticated method and is aimed at the description steps of RCM. Moreover, the RCM project is described on an example of the production machine. The objective is to propose (…)
Passive laser barriers are designed to protect humans from risks of laser radiation in the production environment. Manufacturers of such barriers have to guarantee the protective effect. Therefore, experiments are conducted to determine their protection times. For this purpose, some sample based approaches exist but they are not statistically reliable. An approach for the description of the distribution (…)
The paper deals with properties of metallurgical sinter which are significant in the view of ironmaking optimization. It aims at study of metallurgical sinter disintegration. It presents experimental procedure for disintegration testing. The paper presents results of tests carried out in gaseous environment containing 30 % of carbon oxide and 70 % of nitrogen at temperature of 550 °C. It discusses the (…)
Adaptive assembly and manufacturing system (AAMS) reach intelligence and adaptation capability through the close interplay between four areas: electronics, mechanics, control and software engineering. The paper deals with the AAMS in order to accomplish enhanced adaptability to unstable environments through increased sensing capability and comprehensive control logics, able to self-optimize manufacturin (…)
The introduction of this article describes the significance and characteristic of the Fire Plume virtual origin, which is used in the assessment of certain local fire parameters. Based on selected characteristics for determining the rising of axial temperature, gas flow rate and mass volume of smoke in a Fire Plume, the necessity of the use of virtual origin was assessed. The results were compared usin (…)
The internal surface of the pressure vessels employed in the petrochemistry industry is often faced with materials which are resist to corrosion. The industrial procedure that conjungates the most productivity with the smaller dilution is thatESSC (Electroslag Strip Cladding). The research wants to exceed the actual limits ofESSC process, scanning the possible advantages introduced from Multi StripTechn (…)
The automotive industry is influenced by customers’ requests, including safety and lifetime improvement, weight and emissions decreasing. The paper presents corrosion resistance improvement of car-body components by steel sheets coated with Zn-Al-Mg coating. Specimens coated with GI and Zn-Al-Mg coatings have been deformed by stretching (Erichsen test) and 3-point bending tests to 90 and 180. After defo (…)
In the paper, design and implementation of a method for increase of shearing blades life are described. Blades for shearing of a reinforcing grip bar are made of tool steel 55WCrV8 (19 733 according to Czech Standard). Plasma nitriding method, which allows higher surface hardness while maintaining a ductile core, was chosen as an optimal method increasing blades life. A scratch pattern and a hardness m (…)
This paper describes options available for evaluating tool wear, focusing predominantly on closed-die forging. Correct design of tools and evaluation of tool wear have a substantial bearing on the final price of a product, which is why we have been dealing with this question, striving to develop an optimal methodology for tool evaluation. Wear can be evaluated using the finite element method. However, n (…)
Materials used in car body production are joined by resistance spot welding as the dominant method of joining. Significant changes occur in mechanical and metallurgical properties of the weld nugget and heat affected zone during welding process. The research into these changes is very important for estimation of optimal welding parameters to ensure the required quality of welded joints. The paper deals (…)
High-strength steels can be effectively utilized for strengthening existing structures or to improve highly stressed elements or structural details fabricated from lower grade steel. When used together with traditional grades of steel, the favourable mechanical properties of high-strength steels open up a wide range of applications in the steel constructions of civil and engineering structures, both in (…)
This article analyzes the behaviour of a tube sample during the flaring process. The evaluation is carried out using non-contact 3D optical measuring system ARAMIS, which is ranked among the most modern measuring methods of deformations nowadays. The methodology of experiment including the measurement of the required values using GOM Correlate is described in this paper. The stress-strain path of an obs (…)
An article deals with a design and production of a prototype component for an automotive industry. A theoretical part defines a technology of plastics injection from the point of view of selection, preparation and use of appropriate materials for plastic components fabrication. There is also defined a basic principle of activities of an injection moulding machine with a subsequent description of an issu (…)
The article describes the types of the curing process and its influence on the quality of lacquer powder coating. The curing process will be analyzed on two different materials, aluminum and steel, and in three technically different kilns, followed by the comparison of the burning effect.
Laser welding is a modern method of fusion welding. Due to high welding speeds is necessary to use the machinery welding. This leads to the need for the detection and eventually the elimination of weld defects. Penetration laser welding is not accessible to direct observation and therefore can be monitored only indirectly. A new of possibility is the study of plasma radiation forming over the keyhole us (…)
This article describes how to modify numerical solutions to enable more accurate prediction of the size of heat affected zones (HAZ) during welding of heat treatable aluminium alloys. The size of HAZ affects properties of a weld joint, such as e.g. hardness and strength, and it is also a factor on residual stress and deformation after welding depends. Welding experiments were performed using material (…)
The stressed parts of forming tools are usually made of tool alloy steel X210Cr12 with additional thermal treatment. When machining these parts, due to the high demands on shape and precision, wire electrical discharge machining (WEDM) is used, which a method is belonging to the group of non-convention machining technologies. WEDM uses physical principles to cut material, which enables for machining par (…)
Productivity of automated forging equipment can be improved by increasing the speed of the handling operations. It is necessary to increase the speed of a forging press to increase the productivity of the whole forging equipment. This higher speed can be achieved by adjusting the drive as presented in this article. The typical drive of a forging press consists of an electric motor, gears, energy accumul (…)
This paper deals with design of crankshaft forging press for multi-cavity forging with maximal forging force in on of side cavities. As a tool was used optimization of structure, structural FEM analysis and geometrical modification of frame. Results are in more uniform stress distribution in whole structure of forging press. This design leads to optimized production and improved quality of final produc (…)
This paper deals with possibilities of hydraulic press design optimization. Dynamical loading is deeply discussed here. Technological operation called high speed forging is often used on this kind of machines. This technology leads to vibrations of whole hydraulic press. It must be ensured, that the lowest natural frequency of the whole press is higher comparing with frequency of forging. In research wa (…)
It is necessary to improve parameters of forging lines, because it leads to higher productivity and minimization of costs during production process. This paper deals with parameters of modern preforming processes such as forging rolls and cross wedge rolling. These parameters are compared with respect to maximal forces, moments and total energy consumption necessary for production of identical part.
Off-centre loads acting on hydraulic forging presses have a major impact on their engineering properties. If the tilting moments resulting from such loads are absorbed using an appropriate and effective design, the deformation of the press frame and pressures in crosshead guides can be minimized. The present paper compares values obtained from several variants of virtual models of an open-die forging h (…)
The Taylor Anvil test is used to estimate dynamic behaviour of materials in an interval of strain rates of 102 to 104 s-1. The specimen is deformed due to impact on a rigid target instrumented with detectors. This measuring set provides an advantage in finding the forming force, which acted during the deformation. A Charpy hammer of nominal energy of 50J was used for the verification of dynamic loadi (…)
The paper is focused on the design of a container tool for forming of sheet metal parts used in the aerospace industry, which is based on a flexible medium. The tool is intended for hydraulic press CBJ 500-6 and it is multi-purpose for a wide range of materials, shapes and sizes. A combination of polyurethane plates Fibroflex and two rubber plates are used as an elastic medium. A punch is made of plywoo (…)
The determination of the forming force required for manufacturing of the specified component is very important in practice. It is necessary to know value of the deformation resistance of the forming process for its theoretical finding. This paper presents a methodology for calculating of the total deformation resistance and subsequently of the forming force by using the theoretical equations. The method (…)
This paper deals with numerical simulation possibilities of a hydroforming technology in production of a flow solar absorber with structured surface in asingle technological operation.An austenitic stainless steel X5CrNi18-10 is used as a material for the production of the flow solar absorber. In the theoretical chapters, a comparison between static implicit and dynamic explicit algorithms of finite ele (…)
This paper represents results of student project. The main goal of this work was to redesign and construct hand controlled machine to bend gutter hooks. Hand bender for gutters hooks is used by plumbers’ shops. Redesign of the hand bender is processed with several improvements. The whole process of construction is described in this work. From the introduction to the bending technology, choosing the most (…)
The energy absorption at crash, usually described by stiffness and crashworthiness, is the key request for the car-body components, considering the material they were made from. The modified 3-point bending test with fixed ends has been developed in our department to assess materials for the car-body parts. The force and punch path are measured and used to calculate stiffness and crashworthiness. Experi (…)
Tool material HSS is used for drills forming. The supplied material has enclosed from two separate batches the same certificate from the manufacturer. The material is in the standard CSN 419830. From one batch can be produced drills from the second cannot be produced. The article discusses the detailed analysis of the material. The differences are shown that are not listed in the attestation. Tests were (…)
When applying tailor-welded blanks (TWB) composed of parts with different properties for deep drawing and other forming processes, problems with non-uniform material flow occur. Welding of various parts of TWB into usable units, their different stress-strain properties, respectively different thicknesses influence their formability and the weld movement. This results in inaccuracy of the drawn parts [Ma (…)
Microstructures and microhardness profiles of butt joints welded by fibre laser were evaluated. Dual phase steel HCT980X and bake hardening steel HX220BD sheets with thickness of 1.2 mm were welded at five different welding parameters. The joints showed microstructural changes from ferrite and martensite in dual phase steels or ferrite in bake hardening steels to acicular ferrite, bainite and martensite (…)
The paper deals with the products segmentation that is a flexible way of grouping products and simplifies both campaign planning as well as the creation of condition records in trade promotion management.Capacity channels, which are created by segmentation, increases seriality of assembly processes in customised production (Make to Order/Engineer to Order -MTO/ETO). These advantages enhance the competit (…)
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