National Repository of Grey Literature 278 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
Durability testing of replaceable inserts in cylindrical turning of carbon steel
Smolík, Martin ; Vítek, Jiří (referee) ; Sedlák, Josef (advisor)
The thesis deals with the problems in the field of durability testing of replaceable inserts for longitudinal steel turning. The main objective of the thesis is the analysis of the cutting process based on the results of the performed cutting tests. The cutting tests will be carried out comparatively by testing pairs of inserts, compared to each other. Wear observation is carried out by optical method using a workshop microscope and special software designed to process the acquired images. The output of the work will be an illustration of the different behaviour of the standard and the upgraded set of cutting inserts under different configurations of cutting conditions. The work provides a comprehensive view of the cutting tool testing process and quantifies the degree of influence of the various factors entering into the cutting edge wear process.
Suggestion for rationalization of injection mould part production
Kamenická, Eva ; Kalivoda, Milan (referee) ; Sedlák, Josef (advisor)
The diploma thesis deals with suggestion for rationalization of production of an injection mould cavity plate and of a part responsible for cooling of the final plastic product. The main objective is to reduce the production time while meeting the high requirements for dimensional and geometric accuracy and surface integrity of the manufactured parts. The thesis starts with a theoretical analysis of the production of mould parts. This is followed by an analysis of the initial state of production, which consists of the characteristics of the previously mentionned manufactured parts, the available production means and a description of the original technological process. The experimental part of the thesis explains the procedures and justifies the choices made in the creation of new programmes within the CAM software Cimatron. Several possible variations of tools and cutting parameters have been experimentally tested and their final choice is justified in the thesis. The output of the thesis is a new manufacturing process for the production of both components, which has been applied in practice and evaluated on the basis of the results of testing the quality of the components and the plastic product itself. In the conclusion of the thesis can be found an evaluation of the output of the thesis and a time comparison of the previous process with the new suggestion. All experiments and measurements, including the production of the components themselves, were carried out in the toolroom of ITW PRONOVIA, s.r.o. in Veľká Bíteš, which is also the creator of the topic of this thesis.
Wear analysis of replaceable inserts in parting of structural steels
Drbal, Martin ; Vítek, Jiří (referee) ; Sedlák, Josef (advisor)
This thesis deals with the analysis of wear of replaceable cutting inserts in turning technology. For the experiment three variants of replaceable cutting inserts were used, all from the manufacturer Dormer Pramet s.r.o. These cutting inserts were used for the successive lapping of two different materials. These were bearing steel ČSN 14 109 and stainless steel ČSN 17 349. The thesis contains a theoretical part which is devoted to turning technology and wear theory. The experimental part describes the cutting test procedure, measurements and analysis of the data obtained. At the end of this thesis, additional analyses are performed to reveal the reasons for the variability of some results.
Design of Alternative Production of a Part using 3D Printing Technology
Verner, Tomáš ; Zeman, Břetislav (referee) ; Sedlák, Josef (advisor)
This bachelor thesis deals with the design of an alternative production of a part (sprocket cap). The aim of the thesis is to design an alternative production of the part using 3D printing, to simplify and cheapen the production. The theoretical part includes a description of the existing manufacturing technology and the additive technology (FFF) that will be used for printing the part. Another part of the theoretical work is devoted to the description of additive materials and the subsequent selection of a suitable material, which is PETG material. The practical part of the thesis is devoted to the structural redesign of the part for 3D printing technology and subsequent printing and testing. The thesis concludes with a techno-economic evaluation. The part printed using 3D printing technology performs better from a technical and economic point of view than the original part.
Use of 3D printing in the Czech Republic
Kopecký, Miroslav ; Varhaník, Matúš (referee) ; Sedlák, Josef (advisor)
3D printing is a widely recognized and well established technique that enables the fabrication of complex structures with low production cost and easy scalability. In this study was conducted a comprehensive review of the applications of 3D printing in various industries in the Czech Republic. The first part of the research provides a summary of the different 3D printing techniques available, along with a comparison of relevant printing parameters and acquisition costs. The next part continues with description of the practical applications of the explained 3D printing methods in the Czech Republic industires. Namely, the applications in construction, automotive, education, and healthcare industries are discussed in more detail. The latter one is then brought into focus in the practical part of this work, where a medical aid is fabricated. Specifically the Fused Filament Fabrication (FFF) and Stereolithography (SLA) printing methods are used to fabricate a balance plates for lower limb proprioception training as a cost- effective alternative to commercially available product. Through a comparison of physical measurements, was found that the FFF method yielded more precise printouts. This research highlights the potential of 3D printing in delivering tailored medical aids, offering a promising avenue for future development.
Influence of a size of a cutting edge rounding of the insert during turning
Tichá, Dana ; Sedlák, Josef (referee) ; Dvořák, Jaromír (advisor)
The work is focused on the durability test of replaceable cutting inserts, which are coated with a newly developed coating. In the work are tested two types of replaceable inserts with different shapers, while three different edge roundings are produced for each shaper. The test is performed on three different materials. During testing, the cutting depth doesn’t change, only the feed changes, where tests are performed on each material at two different feeds. A different cutting speed was chosen for each material and feed, which resulted in a durability of the replaceable insert cca 15–20 minutes. The goal of the work is to find out what is the most suitable rounding of the blade on replaceable cutting inserts, when applying a newly developed coating.
A Proposal and Optimization of Cutting Conditions for Turning of a Cemented Workpiece
Heiserová, Sofia ; Sedlák, Josef (referee) ; Kouřil, Karel (advisor)
This final thesis is aimed at optimalisation of hard turning process of cemented workpiece. First part is focused on the study of factors of hard turning. In the second part the work deals with the proposal and conduction of experiments of new cutting parameters in chosen factory. The durability of cutting edges is monitored. This monitoring is based on the evolution of roughness of machined workpieces. Based on the data evaluation, the best cutting edge is selected and used for final optimalisation experiments. Production cost of operational section is calculated for each alternative of cutting parameters in the third part of the thesis. Possible savings were calculated based on the number of machined pieces per year for the cutting edge that was found to have the best results.
Effect of cutting inserts surface treatment on turning durability of stainless steel
Filip, Jiří ; Vítek, Jiří (referee) ; Sedlák, Josef (advisor)
The diploma thesis deals with the testing of coated carbide inserts with different types of surface treatments. The testing was conducted using longitudinal turning technology under constant cutting conditions, and the workpiece material used was austenitic corrosion-resistant steel. The aim was to analyze the wear progress of the cutting edges after predetermined time intervals and to determine the resulting durability of the tested inserts. During the testing, the cutting edges of the tools broke off and the required durability was not achieved. After a thorough examination of the workpiece material, a significant amount of unevenly distributed inclusions was found in the steel structure, which proved to be the main cause of the insert breakage. Therefore, it was decided to perform a replacement test using material from a new supplier. Material analysis of the newly delivered steel showed a significantly better purity of the structure, which was positively reflected in the results of the second test, in which there was no brittle fracture of the edge in any case and the tested samples reached the required durability. The best results were obtained with samples treated on flanks using a new surface treatment method developed by Dormer Pramet s.r.o. After completing the tests, an adhesion test of the coating to the tool substrate was performed using the Rockwell method. Based on microscopic images that revealed partial delamination of the coating, it was evaluated that the quality of the deposited layer was not quite optimal. In a technical and economical evaluation were determined the potentially saved costs when using the experimental cutting insert compared to the reference plate A.
Racionalization of technical plastics cleaning
Bubelíny, Adam ; Osička, Karel (referee) ; Sedlák, Josef (advisor)
The thesis deals with the rationalization of cleaning of technical plastics. The theoretical part of the thesis focuses on surface cleanliness in engineering and possible methods of cleaning and surface treatment with a focus on laser cleaning. The practical part of the thesis deals with the comparison of chemical cleaning with laser cleaning of engineering plastics. The result of the experiment is the evaluation of cleaning time and surface roughness (Ra, Rz) of the cleaned materials. Based on the result of the practical part, a technical-economic evaluation is determined, including an analysis of the proposed solution with environmental impact.
Design of injection moulding production
Škrkoň, Vít ; Seknička, František (referee) ; Sedlák, Josef (advisor)
The aim of the bachelor thesis is to acquaint the reader with the process of production of plastic parts using injection moulding. Emphasis is placed on understanding the order as a whole, or what needs to be considered before and after the production of the plastic parts. The production takes place in the company Josef Škrkoň – Techplast a.s. First, the theoretical model is analyzed in the auxiliary software SolidWorks and CadMold. From the collected data a mould is created, which is fixed to the injection moulding press. The chamber with a screw, which is a part of the injection moulding press, is also described in the work, including the basic phases of the injection cycles that take place in the chamber. Measurement of the main qualitative parameter of the coupling strap was carried out using blast tests. In the last chapter of the bachelor thesis there is a technical-economic evaluation, where the approximate price costs for the production of the coupling strap are analyzed. More precisely, these are the costs of the production of tools, the costs of the production material and the production of the connection strip itself are analyzed. The time demands are given indicatively. Finally, the bachelor thesis is supplemented by analyzing the transport between the production company and the customer.

National Repository of Grey Literature : 278 records found   1 - 10nextend  jump to record:
See also: similar author names
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