March 2022
The article deals with the design of a gripper for a manipulator. The use of a shape memory alloy actuator, which is excited by heating by means of an electric current, is proposed for driving the gripper jaws. Variant solutions of the gripper kinematics and the final design of the gripper arrangement are solved. A gripper kinematics simulation is created to find a suitable gripper geometry.
The article deals with the methodology of verification of mechanical and electronic torque gauges. Legislative metrological requirements are set for these gauges and the verification process for these types of gauges is also set. The working standard is used to verify two selected torque gauges and then the suitability of these gauges is assessed. Measurement uncertainties are identified to determine th (…)
In the paper is described possibility of holographic interferometry in research of heat transfer above samples. Experiments with utilization of this method enable to explain many of actions going in environment and in phase interface between material and this environment in transport of heat. The presented experiments are aimed at verifying the possibilities of safe thermal loading of wood using with me (…)
The die casting technology enables the production of complex casts with good mechanical properties and high repeatability of the production within narrow tolerance limits. However, the casts are showing signs of porosity to some extent, which may reduce their mechanical and qualitative properties. The presented article solves the problem of reducing the porosity f the high pressure die casts by vacuumin (…)
The article describes an optimization methods analysis in the technological process of plastic injection using the simulation tool Autodesk Moldflow Adviser. The Polyethylene 120J was the material used in production of the plastic part analyzed. Following the simulations, deficiencies affecting the quality of the final part were identified. Modifications were gradually made both in the cover's design an (…)
Coal mining is still proceeding in some countries today, although EU countries have agreed to move to a carbon-neutral economy by 2050. Mine gases were developed during coalification. The quantity of gas inside the coal deposits depends on the: level of coalification, quantity of colliery tip and on conditions, which have contributed to the keeping of gas inside the coal deposits. Mine gases are endan (…)
The paper deals with the connection between accidents and occupational diseases due to the weak application of ergonomics in business practice. Applying the principles of ergonomics in the day-to-day running of companies in primary prevention makes it possible to prevent the occurrence and exacerbation of difficulties in the musculoskeletal system of the employees concerned, which can ultimately avert t (…)
The paper is focused on the issue of measuring the amount of fuel in the tank of truck, construction and agriculture machine. The gradual expansion of of the share of the biocomponent in diesel fuel results in greater measurement errors via the capacitive probe in the fuel tank. The proposed solution, which uses three electrodes leads to increased accuracy in measuring of the amount of fuel in the tank. (…)
The article states that the significant improvement of technical parameters for mechanical crank presses of the current concept is already very limited. Significant improvements in technical parameters can be made at the cost of changing the design concept. To substantiate this statement, an analysis of the current situation is performed and the possibility of successful improvement of technical paramet (…)
The mechanical testing in heavy liquid metals is performed in order to obtain information about the influence of the liquid metal on Generation IV candidate construction materials. For testing in heavy liquid metal environment, it is required to test comparably with standards of mechanical testing in air at high temperatures. The paper summarizes the approach to the measurement of mechanical properties (…)
New innovative approaches for building construction are being developed around the world. One of these is printing cement mixtures for which various machines are now being developed. This paper deals with the design of an experimental robotic arm for research into cement mixture printing. A generative design approach was used and discussed in its development. The results describe the solutions obtained (…)
The design of robotic arms is a demanding process, especially in terms of the demands placed on developers' knowledge and experience and the time required for the design. Therefore, the development aimed to create procedures for possible automation of some of the individual tasks of the robotic arm design process, which are further applied in the development of a software tool for the automation of part (…)
Insulating materials are now subjected to precision electrical discharge machining (EDM) using an assisting electrode method (AEM). The electrode materials usually comprise copper, graphite and copper alloys that have high melting temperature and excellent electrical and thermal conductivity. A brass electrode is known as a humble electrode. Performances of brass and copper pipe electrodes were compared (…)
The thermal stability of the machining centers plays a major role in ensuring the production repeatability. All machine tools producers take various steps to ensure it. One of the ways to permanently maintain and stabilize the behavior of the machine tool is the use of active cooling and the choice of appropriate material of which the individual parts of the supporting system are made. In most cases, ma (…)
A self-excited vibration, called “chatter”, is a main limiting factor in chip-forming metal machining. The reduction of machining productivity, worsened machined surface quality and the reduction of lifetime of the machine tool parts, particularly the cutting tool itself, occur as a result of the chatter. There are more ways to suppress this undesired effect of machining. The most common and simplest va (…)
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