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High-speed shaft production design
Polesný, Pavel ; Jaroš, Aleš (referee) ; Kalivoda, Milan (advisor)
In the bachelor's thesis, a production process of the crankshaft of a single-cylinder two-stroke engine is designed. The flywheel has a diameter of 20.5 mm, the crank pin has a diameter 9 g6, the connecting rod pin has a diameter 4 g6, and the total length is 63.5 mm. Due to the production batch of 1000 pieces, the machining method was selected. The crankshaft will be produced as a monolith. Then the grooves at the ends of the ground surfaces 9 g6 and 4 g6 were addressed. Due to the wall thickness of 1.25 mm, the surfaces will be without grooves, and a radius or chamfer will be in the corners. The axial bearing and the connecting rod have an internal chamfer of 0.7x45°, thus grooves are unnecessary. The chosen material is 15.142 steel, tempered to a lower strength, supplied in 25x3000 mm bars by ZJP, s.r.o. The semifinished part will be manufactured on a Swiss-type lathe Manurhin K'MX EVO 732. After nitriding, the part will be ground on a Bernardo URS 500 N grinder. For the machining on the EVO 732, OPTIMA EXTREMECUT 46 mineral oil was chosen, and for grinding, a 2% concentration emulsion mixed from BITOL M petroleum emulsion oil was selected. Then the technological process was developed, and operational instructions were created. Calculations determined that 26 bars are needed for the production of the specified series. The entire series production will take just under 4 shifts.
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Analysis of heat treatment effect on dimension shift
Kunkela, Ondřej ; Jaroš, Aleš (referee) ; Kolář, Ladislav (advisor)
This bachelor thesis focuses on chemical-heat steel processing, mainly to the size change caused by the process itself. To look into the problem closely some samples from various materials and of various size have been made. The samples were measured before and after the ionic nitridation. Likewise the samples, the real peaces were measured, some of them were ionic nitridated and some were cemented. The real pieces were made from the same material but they differed in size and shape. Subsequently, all the figures were processed and assessed.
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Chemical heat treatment of steel
Pišek, David ; Molliková, Eva (referee) ; Němec, Karel (advisor)
This bachelor thesis deals with methods of chemical and heat treatment of steel. This thesis incorporates basic findings and ways of the performance of the chemical and heat treatment with detailed specialization in cementation and nitration of steels. This study is also focused on property of surface layers and their use. The primary aim of this thesis is to evolve an overview of the most frequent methods of chemical and heat treatment of steel and to evaluate advantages and disadvantages of individual methods for a practical use in industry.
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Analysis of heat treatment effect on dimension shift
Kunkela, Ondřej ; Jaroš, Aleš (referee) ; Kolář, Ladislav (advisor)
This bachelor thesis focuses on chemical-heat steel processing, mainly to the size change caused by the process itself. To look into the problem closely some samples from various materials and of various size have been made. The samples were measured before and after the ionic nitridation. Likewise the samples, the real peaces were measured, some of them were ionic nitridated and some were cemented. The real pieces were made from the same material but they differed in size and shape. Subsequently, all the figures were processed and assessed.
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Chemical heat treatment of steel
Pišek, David ; Molliková, Eva (referee) ; Němec, Karel (advisor)
This bachelor thesis deals with methods of chemical and heat treatment of steel. This thesis incorporates basic findings and ways of the performance of the chemical and heat treatment with detailed specialization in cementation and nitration of steels. This study is also focused on property of surface layers and their use. The primary aim of this thesis is to evolve an overview of the most frequent methods of chemical and heat treatment of steel and to evaluate advantages and disadvantages of individual methods for a practical use in industry.
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The effect of surface hardening on fracture behaviour of steels for gear wheels
Dlouhý, Ivo ; Holzmann, Miloslav
Three procedures of surface hardening (carburising, nitriding and surface quenching) combined with six structural steels have been followed. The properties evaluation is based on assessment and interpretation of load - deflection traces, obtained by means of instrumented impact tester and/or at static testing of notched bend specimens. Knowledge obtained has been formulated into generalised schematics of fracture behaviour.
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