The authors within the scientific contribution present the logistics of laboratory experimenting with strengthening the stressed surface layers of machine parts. The project for strengthening the surface layers was conducted without the use of ultrasonic strengthening via the newly developed device with a static pressing force. Emphasis was placed on the stage of identification of samples surface layers (…)
Article assess the effect of thermal modification on the surface roughness (Ra) after the face milling of pinewood (Pinus sylvestris) at different cutting conditions. The experiment was performed with samples modified at four temperatures (T = 160 °C, 180 °C, 210 °C and 240 °C), at three feed speed (vf = 6, 10 , 15 m.min-1), at three cutting speeds (vc = 20, 40, 60 m.s-1) and at positions of three angle (…)
Management of life-cycle costs is an approach that leads to sustainable development and effective use of company’s resources. By using the life-cycle cost method analysis - LCC creates a foundation for complex evaluation of costs of a product from its conceptions to the end of its life-cycle. In the introduction, we present a general scheme of a life-cycle cost analysis and calculation of costs. The ana (…)
The paper describes and analyses own experiences concerning technology of turning by high-speed abrasive water jet. Technology development as well as present stay-of–the-art in given area are introduced in brief. Possibilities of application of such machining method especially in the area of hard and difficult-to-machine materials as well as rocks and wood are discussed.
Centrifugal pump characteristics at different pump operating speeds are important for the successful operation of pumps in various areas of technology. In paper the pump characteristics are discussed to calculate the characteristic functional curves H = f (Q), Pw = f (Q), Pf = f (Q), η = f (Q) of given type of pump, specific work and flow of fluid at different frequencies of rotation, to demonstrate the (…)
The use of cutting inserts is currently a normal part of the manufacturing process. The article deals with structural and material analysis of selected inserts and resulting wear after their use. These analyzes are part of the extensive research carried out at the Faculty of Production Technology and Management of Jan Evangelista Purkyne University in Usti nad Labem. Machining been hardened steel class (…)
The paper is aimed on a vehicle dynamic simulation from scratch, using equations of motion solved by Runge-Kutta algorithm. The vehicle and a terrain interact in a game environment Unreal Engine, using line-trace functionality. All the scene objects are created in Creo Parametric, 3ds Max and Unreal Editor systems. The vehicle can be controlled by a keyboard and a racing steering wheel with pedals. The (…)
The article deals with analysis of problematic focused on identification of pendulum oscillation parameters. Theory is based on mathematical description of physical pendulum with real damping and kinematics theory. The article describes experimental laboratory model of physical pendulum with precise construction. Simultaneously it describes wireless sensor system with dual axis MEMS accelerometer, which (…)
Hard coal mining is characterised by the complexity and specificity of problems related to the use of machines. These problems, which occur at the stage of design, construction and production of machines, build up when the machines are being used. The process of most effective hard coal mining is considerably influenced by reliable mining machines. Every downtime due to a failure translates into the eff (…)
In the field in Corporate Social Responsibility (CSR), international private regulation or self-regulation refers to numerous regulatory frameworks. Soft Law is the other definition which is often used for private regulation. However, some scholars distinguish them from each other. Different examples of International Private Regulations in field of CSR can be mentioned as frameworks for monitoring, cod (…)
Environmental protection, quality requirements for products, eco –design of materials, increasing of production volume and market competition force the manufacturers to adapt to these requirements and also to economic issues. A mathematical method is applied to the solution of this problem. The individual factors of environmental and economic character are expressed by means of different equations havi (…)
This article investigates the effect of recycled material particle size on the resulting mechanical properties of products. The product material was polypropylene with glass fibers. Recycled material was prepared by mechanical way of recyclation, then it was categorized by sieve analysis to different size of particles. After preparation, the samples were subjugated to mechanical tests. The samples were (…)
Radiation crosslinking of filled PBT is a well-recognized modification of improving basic material characteristics. Radiation, which penetrated through specimens and reacted with the cross-linking agent, gradually formed cross-linking (3D net), first in the surface layer and then in the total volume, which resulted in considerable changes in specimen behaviour. The specimens of 30% glass fiber filled PB (…)
Radiation processing of polymers is a well-established and economical commercial method of precisely modifying the properties of polymers, especially mechanical properties. The mechanical properties of modified low density polyethylene samples by beta rays were measured at the ambient temperature and after temperature load above the pure low density polyethylene melting temperature. The tested samples s (…)
The article is focused to compare and evaluate different finishing technologies, such as milling and ISF technology, which are isotropic super fine machining. There were compared two gears manufactured by the same technologies, processes and made of the same material, in the company ZTS Sabinov, however, different finishing technologies were used on each wheel. Both gears are machined by milling and gri (…)
The influence of high doses of beta radiation on the changes in the structure and selected properties (mechanical and thermal) polymers were proved. Using high doses of beta radiation for low density polyethylene (LDPE) and its influence on the changes of mechanical properties of surface layer has not been studied in detail so far. The specimens of low density polyethylene (LDPE) were made by injection (…)
The metal forming technology is (mainly due to the automotive industry) one of the most dynamically developing branch of the engineering industry. Continuous effort to achieve the top technological level and car´s safety factor at keeping the low price level means necessity to still implement into the own production process the newest mathematical models of these technological processes. Thus these days (…)
Durability of cutting tools represent a large spectral index on the basis of which is characterized by functional work. Every manufacturer of cutting tools before the actual production of these tools during the development make a tests and prescribing them characteristics on which is possible then to predict their behaviour in the actual production process. Durability of cutting tools is often indicated (…)
Presented article is focused on monitoring of output control. Primary objective of research was design of most effective automated control of output quality for designated product. Proposal of fixture for output control was chosen as way to achieve main objective. According to performed practical analyse was intended final proposal of measuring fixture for chosen product. Manufacturing companies constan (…)
Presented article is aimed to powder coating and monitoring surface quality. Powder coating is considered as one layer surface treatment to protect against environment. Thickness of layer is several micrometers (depend on powder type) and meets high requirements and demand on surface protection against scratches, abrasion and other material specifications. Presented article is focused on experimental st (…)
Presented article is focused on heat transfer in injection mold, which is designated for plastic parts production. As experimental part was selected two components injection mold with hybrid cooling. Molds cooling system was in two variants: conventional and conformal cooling. In subsequence three variants of cooling were simulated. First variant contained conventional cooling system manufactured by dri (…)
Low-frequency electromagnetic fields and their effect on the employee are paid minimal attention. In this work will measure and describe the influence of low-frequency. Our experiments show necessity of controlling the frequency not only in devices but also on their power supply and cables. All measures were made on VEMA-041 measure equipment with computer software. Measurements were made with the respe (…)
The theory and practice in engineering industry is not the same. Durability of cutting tools is defined in standard ISO 3685. In standard ISO 3685 is defined T-vc dependence for different cutting materials and standard included process evaluation of tool durability for cutting materials made of high speed steel, sintered carbide and cutting ceramic. Standard ISO 3685 contains instructions how to creat (…)
The article deals with comparing the programming of production of thin-walled parts using CAM software. Were evaluated by the number of clicks buttons and the amount of time during which the G codes generated. One side parts has been produced by the program generated by CAD applications Creo Parametric 2.0 and the other side part using Autodesk Inventor Professional HSM PRO 2016 was made on CNC vertical (…)
Durability of the cutting tools is very complex process that is influenced by more factors. On the base of outputs and results these experiments can be completely described the most important elements acting on the resulting durability of a cutting tool. The technical science defines the basic method for determining durability of the cutting tool according to results and knowledge F. W. Taylor. This pap (…)
The article deals with the research of the influence of selected technological parameters of die casting on the internal structure of die-casts based on Al-Si alloys. Among the chosen technological parameters of die casting is pressing piston speed and holding pressure. Examined castings internal structure is defined by the percentage of porosity. The article described the course design and preparation (…)
This paper aims to study the application of various types of high-strength fibres in the recycled polyvinyl butyral matrix, esp. effects of sizing on properties of differently sized. For the verification of tensile test according to standard DIN EN 527-1 we used numerical results. The reinforced material was moulded and the fibres are inserted at a distance of 3 mm and 5 mm at the middle of the matrix (…)
Tools for quantitative risk assessment used in praxis are predominantly based on linear transformations. A parallel problem of current risk assessment methods is constant time and imperceptions of variability of threat over the course of time. Two specific cases of causal dependence are domino effect and synergic effect. Risk as an attribute of causal dependence is common for all present management sys (…)
This paper deals with a new roughing milling cutter design made of high-speed steel by precision casting technology. Each edge of the innovated milling cutter has two special flutes that make so-called compensation edges which help to reduce tensile stress in the end of cutting teeth. Three kinds of PVD coatings ((Al,Ti)N, (Al,Ti,Cr)N and nanocomposite nACo) were used to preserve the tool life. The coat (…)
Receptance coupling methods for predicting tool point dynamics often use an adapter or calibration gauge for extracting the spindle-tool interface dynamics. This, however, necessitates the measurement of the rotation to force and rotation to moment receptances at the free end of the clamped adapter which is difficult to measure practically. The present article provides a new method for determining the r (…)
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