National Repository of Grey Literature 483 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Production of pulley for micro-belts at SPN 12CNC/Sinumerik 810D
Juránek, Martin ; Dvořák, Jaromír (referee) ; Píška, Miroslav (advisor)
As the tittle itself suggests, this thesis deals with the production of two two poly-V pulleys on the lathe SPN 12 CNC. In the first chapter, the thesis mentions transmissions and its types. Furthermore, the main advantages of poly-V pulleys compared to classic V-pulleys are outlined here. There is also geometry and calculation relationships of power ratios in a simple belt transmission. The practical part suggests several methods of creating a possible CNC program for the production of the grooves themselves. The practical part suggests several methods of creating a possible CNC program for the production of the grooves themselves. Among the possible methods, the contour creation method using incremental programming is used, and 6 grooves are created using the FOR counting loop. The work is also supplemented about the methodology for measuring the functional dimensions of the grooves, and there is also the measurement of the parameters of the insert with which the grooves were made.
Rationalization of production to improve roughness of a selected surface of rectilinear hydraulic motors
Urban, Jan ; Píška, Miroslav (referee) ; Sliwková, Petra (advisor)
In this paper, the influence of cutting parameters, machining strategies and material properties on the resulting surface roughness of a selected surface of a groove for a seal on the cover of a straight-line hydraulic motor are investigated. Based on the analysis of the results of the initial experiments of the existing production, specific measures are proposed to rationalize the manufacturing process. The effectiveness of the proposed measures is verified by further experiments carried out on real workpieces under industrial production conditions under the same manufacturing conditions. Subsequently, the results of the methods are compared with each other. The inclusion of a time delay between radial and axial feed during the finishing operation of the grooving had a very positive effect on the surface quality. The surface roughness values not only came within the prescribed tolerance but well below it. The economic evaluation shows that the rationalised production process does not have a noticeable effect on the overall cost of production and hence the results of this thesis are recommended for implementation in practice.
Design of production technology for a distribution block
Večeřa, Jiří ; Píška, Miroslav (referee) ; Sliwková, Petra (advisor)
The master's thesis focuses on the design of manufacturing technology for a selected component made of ductile iron EN-GJS-400-15. The theoretical part of the thesis discusses the technologies used in component manufacturing, such as turning, milling, drilling, surface grinding, honing, thermal energy debburing and phosphating. The subsequent sections specify the specific production machines and cutting tools utilized in the component manufacturing process. In the practical part, a technological procedure is proposed, describing the sequence of manufacturing operations required for producing the component. It also includes inspection operations for measuring tolerances. Additionally, manufacturing instructions are provided, offering a detailed description of individual manufacturing operations and specifying the frequency of tolerance checks. The thesis concludes with a technical-economic evaluation, summarizing the material costs for production preparation, the costs for ensuring the production itself, and evaluating the manufacturing technology.
Design of technology for gear manufacturing
Urbánek, Michal ; Píška, Miroslav (referee) ; Sliwková, Petra (advisor)
The master’s thesis is focused on the design of production technology and the choice of machines and tools to achieve the required accuracy according to the drawing documentation. During the design of production options, the advantages and disadvantages of gear machining variants were described. In the theoretical part, the technologies of the proposed operations were described, such as turning, milling of gears in a rolling method, shaving and grinding. In the practical part, the production itself is described in all sixteen operations that were needed to produce the part. Instructions and tables of measured dimensions were created for each machine operation. The economic evaluation summarizes material costs, machine and preparation times depending on the size of the production batch.
A technological preparation of the wiping plate production
Balhar, David ; Dvořáková, Jana (referee) ; Píška, Miroslav (advisor)
The main aim of this master's thesis is to propose a technological preparation of the wiping plate production. Elaboration is divided into four chapters. The first chapter describes forming tool (function and construction). In the second chapter is technologies overview, which are used for the wiping plate production. The most important is the third chapter, because it deals with the main output, and the actual proposal of technological preparation of the production. In the fourth chapter, production is reviewed economically.
Technological, economical and ecological aspects of dry machining
Vostřel, Josef ; Csölle Putzová, Ildikó (referee) ; Píška, Miroslav (advisor)
Using of process liquids improves the procedure and results of machining, on the other hand, increases costs and raises some ecological and hygienic issues. In the work there is gradually analyzed mechanism of chip formation, progress and distribution of heat and thermal fields as well as economic and ecological aspects of dry machining and influence of dry machining on durability of tools. In the experimental part there are evaluated data which were measured during the drilling of cylindrical workpiece with regards to progress of workpiece thermal fields while using various kind of tool coating. In the final part there are stated recommendations for practice.
On the cutting performance analysis of milling tools for a selected application.
Němeček, Lukáš ; Sedlák, Josef (referee) ; Píška, Miroslav (advisor)
The presented diploma thesis is devided into two parts. The theoretical part deals with types of milling, the choice of the cutters, choice of material of exchangeable cutting plates and also with types of wear and their classification. The second part of the thesis deals with experiments where the power load of the tool was measured. The observed data were processed and graphs of power load were created by software. Conclusions are based on these graphs.
On the production of an agricultural machinery part and its optimization
Tenora, Tomáš ; Osička, Karel (referee) ; Píška, Miroslav (advisor)
This master's thesis deals with the process of machining a forged connecting rod in cooperation with the company Zetor Tractors a.s. The first chapter of the thesis is focused on a detailed introduction of the company. The second chapter includes an elaborate analysis of the technical documentation and requirements concerning the making process of the subject of study, specifically the construction of the connecting rod. In the third chapter, the current production technology is discussed and described in detail. The aim of the fourth chapter is to propose an innovative technology which can be used for the production of connecting rods in the required quality. The fifth chapter is aimed at testing the newly designed technology. In the final, sixth, chapter, a technical and economical evaluation of the proposed procedure is performed.
Finishing machining of hard-to-machine materials
Filípek, Timotej ; Varhaník, Matúš (referee) ; Píška, Miroslav (advisor)
The Master‘s thesis focuses on processing of hard-to-machine materials by the finishing machining methods. The first chapter comprises division and characteristics of finishing technologies in the field of machining processes. The chapter following includes division and characteristics of the hard-to-machine materials. The experimental part – another significant part of the thesis – is focused on grinding of mostly bearing rings made of hard-to-machine materials. The aim of the experimental part is to compare and subsequently assess the use of various kinds of grinding wheels in the grinding process of a given workpiece material. Several parameters are examined from the technological and economic point of view. The assessment of the experimental part provides an overview on the advantages and disadvantages of the use of the grinding wheels in the grinding process of a given material for large-scale production. The conclusion is a summary of the results obtained in the experimental part.
Measurement of Production Overall Equipment Effectiveness
Žanda, Miroslav ; Novák, Josef (referee) ; Píška, Miroslav (advisor)
The diploma work deals with measurement of Production Overall Equipment Effectiveness in manufacturing company Alfa. Firstly, is processed the theoretical part concerning general production, TPM, lean manufacturing and OEE. After than is described the company, monitored device and technology used by the device. In the final section is evaluated the OEE for January, February and March; analyze downtimes, mistakes and losses and their solutions are proposed. The last chapter is devoted to the economic evaluation of the proposal.

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