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Superhard cutting materials and theirs effective use
Stradějová, Alena ; Madaj, Martin (referee) ; Humár, Anton (advisor)
The master’s thesis is aimed at superhard cutting materials (polycrystalline diamond and polycrystalline cubic boron nitride) and their effective utilization. It describes the characteristics and production of these materials and evaluates product ranges of the most significant producers of tools and tool materials in given area. It further compares working conditions of selected world's producers which are related to the growing utilization of these materials in machining process. The thesis also deals with the cutting power of tools and provides a technical-economic assessment of the discussed issue.
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ON THE DEVELOPMENT OF HIGH-PERFORMANCE DRILLING TOOLS BY MEANS OF CAD/CAM AND ANALYSIS OF CHIP FORMATION MECHANISM
Madaj, Martin ; Janáč, Alexander (referee) ; Prokop, Jaroslav (referee) ; Píška, Miroslav (advisor)
This document deals with the development of drilling tools by means of CAD and CAE technologies. At first, a brief overview of various design procedures of 3D drill models is presented, possibilities of measurement of force and moment loading during drilling are mentioned, a chip formation mechanism is briefly described and then a list of commonly used explicit (mesh) finite element methods used for cutting simulations is presented. A meshless SPH method have been selected for this work. Although it is able to handle the large deformations easily, it has been used for cutting simulations very rarely and only an orthogonal cutting simulations related information can be found in scientific databases. It has been demonstrated on the orthogonal cutting simulation of A2024-T351 alloy that was also the starting point for SPH simulation of drilling. The following is a decription of the design, simulation and prototyping of new drilling tools - drills with three and two cutting edges and an internal chip channel. This document is focused in detail on the variant with two cutting edges for which SPH drilling simulation has also been performed. Some drawbacks related to more precise chip simulation demands have been revealed, especially a rapid increase in number of SPH elements followed with prolongation of a computational time. Information related to the design of the drilling head with two cutting edges were then used to create the patent application.
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Drilling technology
Vejtasa, Vladimír ; Madaj, Martin (referee) ; Kalivoda, Milan (advisor)
The first part of the bachelor's thesis deals with the problems of drilling, roughing out, reaming and recessing including the used tools. The second part is focused on the presentation of the range of goods of the selected tool companies. The third part deals with the problems of the CNC machines and especially with their programming. In the end of this part there is a demonstration of a NC program which was created for the chosen product.
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Reprap, 3D FDM printer
Minařík, Miroslav ; Madaj, Martin (referee) ; Zemčík, Oskar (advisor)
The essence of this bachelor’s thesis is describe RepRap, 3D FDM printer. First, the work is focused on presentation some posibilities of rapid prototyping and explain basic mechanics of FDM technology. In the second part, several types of RepRap printers are described and use 3D printer in practice.
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Solution CNC technology of part whit a CNC-unit Sinumerik
Forbelský, Jiří ; Madaj, Martin (referee) ; Kalivoda, Milan (advisor)
This bachelor thesis elaborates complete manufacturing process of a shape shaft. Technological procedure is designed in two variants. The practice variant employs tools, material and CNC lathe available at university workshop. The designed technological procedure has been verified by manufacturing the shaft. Series production utilizes modern tools and an industrial lathe. Both the described variants are compared and evaluated.
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FEM for machining simulation
Vojtek, Aleš ; Madaj, Martin (referee) ; Zouhar, Jan (advisor)
The introduction to turning basics, chip separation process, cutting force generation and description of the finite element method. With this knowledge, a cutting simula-tion of AISI 1045 steel was done for 3 different rake angles, which was simplified by using an orthogonal machining model. The next simulation was cutting of AISI 6150 steel with the use of a 3D model of the grooving insert. The results of these simulations were then compared to the experimental results, and feasibility of finite element method was determined together with future recommendations for acquiring more pre-cise results.
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FEM for fast machining simulation
Šeda, Pavel ; Madaj, Martin (referee) ; Zouhar, Jan (advisor)
The work will be focused on FEM for fast machining simulation. Introduction described the theoretical basis of FEM. The various methods (implicit, explicit) and the individual programs (ANSYS Ls-Dyna, Abaqus, Deform, AdvantEdge). At the end of the model calculation will be made for orthogonal cutting, which will be created in Ansys Worbench, counted in a computer program LS-DYNA and the results displayed in the LS-PrePost.
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