|
|
Advanced methods of surface topography evaluation
Metelková, Jitka ; Prokop, Jaroslav (referee) ; Píška, Miroslav (advisor)
This paper provides an overview of contemporary methods for evaluation of the part surface, nowadays measurement devices and evaluated parameters. The main part of the paper is devoted to advanced methods of surface topography evaluations including the application of the new non-contact measurement technique Alicona G4. The experimental part deals mainly with a study of surface texture parameters of the machined aluminium alloy AlCu4MgSi when face turning. It concerns mostly a study of the tool feed rate influence (the uncoated insert GIPA-6.00-3.00, ISO 513 N05-N25, Iscar) on selected profile and surface parameters, including comparison of measurement results achieved by the contact (Form Talysurf Intra 50, Taylor Hobson) and non-contact method (IFM G4, Alicona).
|
|
|
Analysis of effects of short-circuit current in switchgear cabinet
Prokop, Jan ; Bušov, Bohuslav (referee) ; Valenta, Jiří (advisor)
The work is focusing on dynamic effects of short-circuit currents, more precisely dynamic effects of short-circuit currents on switchgear cabinet (terminal box). The work was designated to a concrete construction type of two switchgear cabinets located on rotating machines via company Siemens Electric Machines Drásov s.r.o.. The switchgear cabinets are designed for non-explosive environment where the air is used as an insulating medium. The task was to determine how the device will behave during the three-phase short-circuit and three-phase short-circuit with earth/ground connection. The following programs were used for the calculations and simulations: Ansoft Maxwell 16.0, Ansoft Maxwell 2015 and ANSYS Workbench 16.0. By using these programs the effects of forces which acts on current paths in cabinet caused by the passage of short-circuit current were simulated, statically and also dynamically. Further the effects of pressure acting on cabinet frame during the arc short-circuit have been statically and dynamically simulated. All the results are summarized in the conclusion. Conclusion also contains the final evaluation of the functionality of both switchgear cabinets.
|
|
|
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.
|
|
|
Economic analisis production of the process
Rybka, Libor ; Osička, Karel (referee) ; Prokop, Jaroslav (advisor)
The final year thesis presented at the Faculty of Mechanical Engineering of the Technical University in Brno deals with economic analysis of the produc-tion process. Cost items are specified in the introduction of this thesis. After that the detailed analysis was made. This part of the diploma work is ended with a pattern example for optimalization of production costs. The second part of the diploma work deals with growth ratio of the productivity and with indica-tors of critical produced volume. In the conclusion of the diploma work there is a comparison of two technological alternatives of the production.
|
|
|
Study use of water jet
Tvarůžek, Martin ; Prokop, Jaroslav (referee) ; Osička, Karel (advisor)
The study of the purchase possibilities of one´s own water jet technology is being conducted in the thesis. The study is aimed at providing a conception in concrete numbers to a particular company, which would help it with making decisions about investing funds in investments to the purchase of one´s own equipment for the water jet.
|
|
|
Technology dividing material grinding
Jermolajev, Štěpán ; Kalivoda, Milan (referee) ; Prokop, Jaroslav (advisor)
The bachelor thesis deals with the general specification of the technology of dividing materials by grinding. It describes cutting wheels and defines basic technological parameters of the cutting process with regards to relevant technical standards. Several ways of measuring or calculating some of these parameters is demonstrated on a practical issue.
|
|
|
Trend development of electrodischarge sinking machines
Čumpl, David ; Prokop, Jaroslav (referee) ; Osička, Karel (advisor)
In this work, a principle of Electro Discharge Sinking Technology is described as well as comparison of individual machine producers. Further, description of an electrode production technology is included together with a recommendation of a machine to a middle mechanical engineering company. Last part is dedicate technical and economical analysis on concrete types of machines and adumbration another trends of development.
|
|
| |
|
|
Technological and economical aspects aplication CNC machining centers
Martiňák, Marek ; Osička, Karel (referee) ; Prokop, Jaroslav (advisor)
The Aim of this diploma thesis has been to analyse the application of the CNC machining centers for the production especially with concentration on accuracy and economical aspect of the machining process. After the study of the literature and making familiar with the production on the CNC machine tool of the type Deco Sigma 20 ( manufacturer, the firm Tornos ) it has been evaluated the technology of the design of the chosen part, its machining accuracy and found out the economical parameters of this machinery for this chosen part as a necessary supposition for securing the correct production in accordance with the requirements of the client. The described process of the technological and economical preparation for the production as well as its checking can be used in future for the proposals of the further similar parts.
|
|
|
Special unit to test hardness.
Kolář, Ladislav ; Prokop, Jaroslav (referee) ; Kalivoda, Milan (advisor)
The goal of this work is to provide simple overview in the field of devices for measuring hardness with a focus on new technologies used by modern devices. This work should indicate the suitability of the use of different measurement methods for specific conditions and get acquainted with some measuring device on the current market.
|
guest ::
