CONTRIBUTIONS TO THE DEVELOPMENT OF A MODEL OF ECO TECHNOLOGIC ORGANIZATION

The paper present a series of contributions to the development of a model of eco technologic organization. Managers of various organizations generally recognized the need for change, as a way to cope with competitive pressures, but many do not understand how the change should be implemented. The key to success is to integrate employees, their roles and responsibilities within the organization in a structure of processes. A process-based approach and starting with the declaration of vision and mission, analyzing critical success factors and identifying the basic processes, it is the most effective way of employment of staff in the process of change In these conditions paper addresses notions of implementation of the change in the industrial organizations: organizational change process, consequences of ignoring the change, internal and external factors of change, actions needing chang

THE PRINCIPLE ON WHICH THE DIMENSIONAL WORKING IS BASED THROUGH COMPLEX ELECTRICAL EROSION

The Working through complex electrical erosion is a process of removal of the excess of working through repeted action of electrical discharges within the impulse, in the limited space between an electrode connected at one pole and the object of working connected at the other pole, of a tension impulses generator. The paper presents the study of the elementary processes which unfold simultaneously within the elementary working space, as well as the knowing and mastering of the physical mechanism of the drawing material

RISK ANALISYS REGARDING HEALTH AND SAFETY AT WORK

The work was created according to the provisions of the work safety legislation in force, regarding the obligation of the management of the economic agents to correctly determine the risk factors in order to ensure the measures for prevention of accidents and professional illnesses. The analysis presents the main aspects of the frequent mistakes that may arise in the risk assessment. So, it has been concluded that risks are inevitable in business, and that each activity is unique, as well as the risks from one activity to another or from one group of activities to another. Under these circumstances, it has been established that the success of an enterprise depends on how the risks were managed

ANALYSIS OF CAUSES WHICH DETERMINE THE DEGRADATION OF CONVEYORS WITH METAL INSERTS

The paper aims to analyze the causes that lead to the rapid degradation of the conveyor belts with metal inserts and their removal. Thus, the analysis revealed three main causes, namely the separation of the metal cord inserts from the rubber matrix, the longitudinal splicing of the conveyor belts with metal inserts, the appearance of micro cracks on the bearing face and on the rolling face. The analysis highlights the main aspects of the major problems encountered during the operation of conveyor belts

Optimizing the Shape of Welded Constructions Made through the Technique “Temper Bead Welding”

Welded constructions are subject to high stresses during operation. One solution for improving the behavior in exploitation of welded constructions in various cases is to use the welding technique “temper bead welding” (TBW). In the paper, the optimization of the geometry of the welded joints by the TBW technique was performed. Thus, corner welded joints made of S355 steel were analyzed. To make the welded joints, three layers of welding seams were deposited, and the intermediate layers were processed through cutting with various radii. To analyze the influence of the size of these rays on the behavior of welded constructions, a research program based on factorial experiences was designed. The samples were tested in terms of fatigue behavior by applying loads between ±8 kN and ±12 kN. The research also focused on determining the hardness of the materials in the joints welded and on determining the microstructure of the materials in the heat affected zone (HAZ). Research has shown that it is possible to improve the characteristics of joints made by the TBW technique in the sense that it can be achieved an improvement in fatigue stress, a decrease in the hardness of the HAZ material and an improvement in the metallographic structure of the HAZ material, meaning that it has a structure made of ferrite and fine pearlite

Reducing of Energy Consumption by Improving the Reclaiming Technology in Autoclave of a Rubber Wastes

The devulcanization of the rubber wastes in autoclave represent a technological variant that allows the superior utilization of rubber wastes, but with high energy consumption. The researches aimed at improving the devulcanization technology in order to obtain reclaimed rubber with superior characteristics, but also with a reduction in energy consumption. An improvement to devulcanization technology consisted in vacuuming the autoclave at the end of the devulcanization process. An increase in the degree of devulcanization of the rubber from 86.83% to 93.81% and an improvement of the physico-mechanical characteristics of the reclaimed rubber was achieved by applying this technology. The realization of the new type of regenerated rubber allowed for an increase in the degree of it use for different mixtures, from 15–20 phr to 30–40 phr without substantially affecting the physical and mechanical properties of the products. Additionally, the researche has shown that, by obtaining the new type of reclaimed rubber, the duration of the refining process has been reduced by 30%. All of this leads to a considerable reduction in energy consumption and transformation of the rubber waste reclaiming process into a sustainable one

Vulcanization of Rubber Conveyor Belts with Metallic Insertion Using Ultrasounds

AbstractFor increasing the life of conveyor belts, it requires a vulcanization joint of them, so that, in the joint area, physical and mechanical characteristics must be the same or very close to the rest of the conveyor belt. Conveyor belts with rubber matrix and embedded metallic insertions are working in very difficult operating conditions and thus their jointing require to take place in optimal conditions. Researches have taken into consideration the type of ATRBZ rubber conveyor belts reinforced with embedded metallic insertions. To observe the effect of applying ultrasound on vulcanization process, there were considered two distinct processes, namely one in which ultrasonic energy is not used, and one in which the process is activated ultrasonic, with frequencies in the range of 17-19 / kHz. Applying ultrasound showed a vulcanized joint of conveyor belts with embedded metallic insertions have superior characteristics in comparison with those obtained when not using ultrasound

The Redesigning of Tires and the Recycling Process to Maintain an Efficient Circular Economy

The redesigning of tires is addressed from two points of view, namely the structure of the materials and the constructive shape of these products. The necessity for research is justified by the fact that even during the product design stage, there may be situations that can irreversibly affect the separation of product components (rubber and insertion), and because it is strictly necessary to achieve the reuse and recycling of waste components. The proposed redesign refers to the inscription of the types of materials that are present in each area on the lateral surface of the tire. Thus, the new redesign has positive effects both economically and socially. To highlight these, a cost-benefit analysis (CBA) has been applied and the net present value (NPV) as well as the internal rate of return (IRR) have been determined for the classic scenario and for the two proposed scenarios. Testing the financial sustainability of the proposed solution was done through sensitivity analysis. An analysis of the new tire design from the point of view of the circular economy was also presented. The results obtained have highlighted the effectiveness of the proposed solution from a technical, economic, social, and protection of the environment point of view

Reducing of Energy Consumption by Improving the Reclaiming Technology in Autoclave of a Rubber Wastes

The devulcanization of the rubber wastes in autoclave represent a technological variant that allows the superior utilization of rubber wastes, but with high energy consumption. The researches aimed at improving the devulcanization technology in order to obtain reclaimed rubber with superior characteristics, but also with a reduction in energy consumption. An improvement to devulcanization technology consisted in vacuuming the autoclave at the end of the devulcanization process. An increase in the degree of devulcanization of the rubber from 86.83% to 93.81% and an improvement of the physico-mechanical characteristics of the reclaimed rubber was achieved by applying this technology. The realization of the new type of regenerated rubber allowed for an increase in the degree of it use for different mixtures, from 15–20 phr to 30–40 phr without substantially affecting the physical and mechanical properties of the products. Additionally, the researche has shown that, by obtaining the new type of reclaimed rubber, the duration of the refining process has been reduced by 30%. All of this leads to a considerable reduction in energy consumption and transformation of the rubber waste reclaiming process into a sustainable one