Purpose of this paper: This paper presents a comparison of the oxyfuel flame cutting and plasma cutting in economic terms. The cutting method you can choose depends on the type, thickness and amount of metal you need to cut as well as the cut quality you require. The cost estimation is also critical. In order to obtain maximum of technical and economical efficiency, in these cases, very important is to estimate the production cost and the production rates. Knowledge of investment and operating cost represents a base for investment in cutting machine. For different cutting machines typical investment costs and operating costs depend from the power of the cutting machine and important. To determine the cost of cutting 1 m it should be specify the type of cutting material, cut quality and used parameters. In this paper economic analysis of the cutting processes has been performed for low alloy steels with thicknesses of 2, 5, 10, 15, 25 and 50 mm. In this economic analysis were calculated the direct costs (electric energy, gases, depreciation and consumables), without the labour cost. The analysis shows that the cheapest cutting process for 10-15 mm thick is plasma cutting, for a thicker plates more economical process is the oxyfuel flame cutting. Plasma cutting provides a good balance in terms of capital costs and a optimal mix of cut quality, productivity and operating cost. It offers a significant thickness range and material flexibility and provides the highest cutting speed. Design/methodology/approach: Different measures of cost may be appropriate, depending upon the context in which the comparison is being made. In this paper used the most common measures (cost per unit time, cost per unit length) Findings: In this economic analysis were calculated the direct costs (electric energy, gases, depreciation and consumables), without the labour cost. Cost estimation of cutting methods and assessment of the most cost effective process for a given type of parts manufacture is quite an involve process. It depends on many factors related with the quality that must be obtained. Research limitations/implications: All cutting technologies have stable long term industrial application and differ distinctively by technological parameters, economics and quality of cut edges. Knowledge of a cutting system’s investment and operating costs should form the basis for evaluating its profitability. The investment and operating cost must be justified according to economic criteria with corresponding financial advantages. Practical implications: In addition to the technical aspect, which has a significant impact on the choice of cutting technology is a very important to know the economic aspect. To see the competitiveness of the method, it is important to know the actual cost of cutting 1 meter in length. Comprehensive analysis of the technical and economic aspects of cutting technology allows to avoid wrong decisions. Originality/value: In this paper economic analysis of the cutting processes has been performed for low alloy steels with thicknesses of 2, 5, 10, 15, 25 and 50 mm. In this economic analysis calculated the direct costs (electric energy, gases, depreciation and consumables), without the labour cost.
The influence of cutting technologies on the quality, mechanical properties and microstructure of the cut edges of steel is presented. The cutting technologies cover: plasma, laser beam, water jet and oxyfuel flame cutting. During investigation the measurements of perpendicularity tolerance, hardness, mean high of the profile Rz5 and metallographic examination were carry out. The results revealed that the lowest hardness was achieved by water jet cutting, whereas the highest was obtained by plasma cutting under the water surface. The lowest perpendicularity was obtained by plasma cutting under the water surface but the highest was achieved by laser and HD plasma cutting. The conducted experiments revealed moreover that the lowest roughness was achieved by means of plasma cutting over the water surface, whereas the highest by laser beam cutting.
W pracy przedstawiono wpływ technologii cięcia na właściwości mechaniczne, mikrostrukturę i jakość warstwy wierzchniej. Technologie cięcia obejmowały cięcie: plazmą, wiązką laserową, strumieniem wody oraz tlenem. Prowadzono pomiary tolerancji prostopadłości, twardości, średniej wysokości profilu Rz5. Wykonano również badania metalograficzne. Najmniejsza twardość powierzchni po cięciu zapewnia cięcie strumieniem wody, natomiast największe cięcie plazmą pod lustrem wody. Najmniejszą tolerancję prostopadłości zapewnia cięcie plazmą pod lustrem wody, natomiast największą cięcie wiązką laserową i plazmą HD. Najmniejszą chropowatość powierzchni zapewnia technologia cięcia plazmą nad lustrem wody, natomiast największą wiązką laserową.