National Repository of Grey Literature 223 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Verification of Numerical Simulation Using a 3D Optical System for Measuring Deformations
Zakl, Alexandr ; Peterková, Eva (referee) ; Řiháček, Jan (advisor)
This master’s thesis discusses the current state of optical metrology and its place in manufacturing and optimization of parts made by deep-drawing technologies. First part is devoted to building a solid knowledge base in different fields that this thesis draws from. These fields are Optical Metrology, deep drawing of sheet metal and simulations using finite elements method. Subsequently, in the experimental part there are chapters dedicated to Measurement and creation of material models and measurement of grid markings on deep-drawn parts provided by ACO Industries, measured by photogrammetric system from German Company GOM metrology. Additionally, for reference to the measurement, FEM software called PAM-Stamp is used to simulate and predict the final state of the parts after manufacturing. Furthermore, optical metrology was used during creation of material models, data supplied by this analysis was used as an input for the simulations. The last chapter then deals with the evaluation and comparison of measured and simulated data and drawing conclusions about the reliability of optical systems and modern technologies in technical practice.
Design for Manufacturing of a Cover
Rusková, Marie ; Císařová, Michaela (referee) ; Řiháček, Jan (advisor)
The thesis deals with the design of the air conditioning cover, which will be placed on the roof of the bus. The part is made of 17 240 stainless steel, which is suitable for cold forming, due to its outdoor environment. Deep drawing is chosen as optimal after assessing possible production technologies. Furthermore, the most suitable shape of the blank is proposed and the necessary calculations are carried out, which are verified by numerical simulation. The deep drawing will take place in one operation. Hydraulic press CTH 250 is chosen based on the required force 554.5 kN
Design for Manufacturing of Wheel Hub Cover
Kunc, Ondřej ; Jopek, Miroslav (referee) ; Řiháček, Jan (advisor)
The thesis deals with the design of the production of a wheel hub cover made of 17 350 stainless steel. The cover is in the form of a cylindrical cup with a diameter of 74.5 mm with a flange and a depression in the bottom. The wall thickness is a constant 1 mm. For the production of the series of 100 000 pieces was chosen conventional deep drawing technology. The choice of the technology is followed by technological calculations. The part will be produced in three drawing operations followed by a calibration operation. Verification of the manufacturability of the proposed process was carried out by numerical simulation in PAM - STAMP software. All operations including blank cutting and flange cutting will be performed in one tool clamped in a Dieffenbacher PO 250 hydraulic press.
Manufacturing of a Valve Body
Ostřížek, Jan ; Štroner, Marek (referee) ; Řiháček, Jan (advisor)
The work deals with the manufacturing of a valve body from copper alloy CuZn40Pb2. The introduction of the work includes an analysis of possible manufacturing methods, with multi-way forging being selected as the most suitable method. Based on the evaluation of manufacturability, shape modifications are made, machining allowances are prescribed, and dimensional tolerances are determined. Two tool geometries are proposed and verified using numerical simulation. These are also used to determine the required forging force. From the volume of the forging, a raw material 60 x 115 mm is determined. It is inductively heated to forging temperature and then forged in one operation on the crank press LZK 2500 P/SH. At the and the flash is trimmed using the LKOA 200 press.
Manufacturing of Motorcycle Sprocket
Hrazdíra, Michal ; Podaný, Kamil (referee) ; Řiháček, Jan (advisor)
The work focuses on the production of a motorcycle sprocket, which transfers the torque from the output shaft of the gearbox to the rear disk of the wheel. Steel 12 050 was chosen for the production of the component, which is suitable for the intended purpose. The sprocket, produced in a series of 80,000 pieces per year, has a diameter of 191.9 mm and a thickness of 5 mm. After considering all factors, fine blanking with v-ring was selected as the manufacturing method. For this series, a semi-finished product in the form of a coil was chosen, which has an outer diameter of 1,400 mm and a width of 204 mm. For the annual production batch, 59 full coils and one incomplete coil will be required. Before the actual tool design, technological and control calculations were performed to verify the functionality of the proposed cutter. The tool was supplemented with technical documentation and a detailed description of the construction. Based on the calculated values, a triple-action hydraulic press Feintool HFA 11,000 plus was designed, which is part of the production line, which also includes decoiling and straightening equipment.
Manufacturing of the hydraulic pump shaft
Nečas, Zbyněk ; Řiháček, Jan (referee) ; Císařová, Michaela (advisor)
The thesis deals with the design of the production technology of the drive shaft of a hydraulic pump, the main element of which is the groove inside the shaft cavity. This component will be manufactured by Metaldyne Oslavany, spol. s.r.o., where the production series was set at 300,000 pieces per year. The material of the component was also specified as DIN 20CrMo5 steel, which will be purchased for production in bars with a diameter of 42 mm. The workpiece will then be cut from them using circular saws. After evaluating the specified requirements, based on the analysis of the specifications, the cold forming technology is chosen for production, specifically the combination of extrusion and upsetting, which the thesis focus on. Three basic production processes were put in place, for which their manufacturability was verified using the Simufact Forming 2023.4 simulation software. For the most suitable production variant, the flow stress, deformation resistance, and forming forces are calculated for each operation, which were then compared with the results of numerical simulation. According to the highest calculated force, a suitable machine was chosen from the company's current machine park, specifically a conventional single-operation hydraulic press SMG HZPU 320 with a nominal force of 320 tons. Then, tool sets were designed for each of the forming operations, when it was found that in all operations the die must be encapsulated using two clamps. The LP4-Kopřiva program was used to determine the optimal contact diameters, contact pressures and other encapsulation parameters.
The production of a component of a lever lock
Hráček, Josef ; Řiháček, Jan (referee) ; Peterková, Eva (advisor)
The master‘s thesis deals with the suggestion of the production of a component of a lever closure, which is used as a quick-clamping mechanism. The part is made of low-carbon steel DC01 in the form of a sheet with a thickness of 1.5 mm and an annual production of 200,000 pcs. The individual production methods were chosen using a progressive combined tool that combines cutting and bending. After evaluating the technology, determining the developed shape of the part and choosing its location on the line was chosen a semi-finished product in the form of metal coils sheet. After determining the production procedure, which consists of four steps, technological, construction and control calculations were carried out on the basis of which the tool was constructed. An eccentric press LEN 63 C was chosen as a suitable machine for production. A feed line marked ARPL RAL 150 was also chosen for production.
Possibilities of Forming Limits Determination
Gímeš, Martin ; Svoboda, Petr (referee) ; Řiháček, Jan (advisor)
The bachelor thesis describes selected technological tests for evaluating formability. The thesis is divided into two main parts, which deals with the evaluation of sheet and bulk formability of materials. Based on a literature review, the thesis presents the factors influencing the formability and material plasticity. Furthermore, it discusses the principles of selected tests. Subsequently, it addresses the conditions and procedures set by standards and the necessity to adhere to them. Possible test specimens and their modifications are considered. The number of repeated tests, and possibly the evaluation of suitability or unsuitability of deformed samples for formability assessment, are discussed. Methods of evaluation for individual tests are outlined. The thesis presents experimental results for each test with descriptions of the test specimens and materials used, obtained from practical sources.
Production of gear shaft
Zahálka, Tomáš ; Řiháček, Jan (referee) ; Jopek, Miroslav (advisor)
The work is focused on the design of the production of the transmission shaft semi-finished product, with a closer focus on the transverse wedge rolling method. The manufactured part with the largest dimensions of 80 mm and length of 322.7 mm is made of steel 15,230, with a total series of 200,000 pieces per year. The work first focuses on the theoretical part, in which the mentioned technology, which belongs to the volume hot forming methods, is researched in detail. This is followed by a practical part with the necessary technological calculations, tool design, its verification by simulations and technical-economic evaluation. The tool is designed as a circle, consists of an upper and a lower part that have the same sense of rotation, and is dual-operation. The roll becomes profitable after reaching 186 517 pieces, at a price of CZK 368 per piece.
Manufacturing of a Coupling Body
Dostál, Martin ; Jopek, Miroslav (referee) ; Řiháček, Jan (advisor)
The thesis deals with the design of the production of the clutch body. The production company is Zetor Kovárna s.r.o. It is a slightly more complex component used in the automotive industry. The production run is 80,000 pieces per year. The material for production is lowcarbon steel 12 020. Of all the evaluated production technologies, production by hot die forging is chosen. A suitable shape of the forging is also designed for it. The input blank is a rod with a diameter of 100 mm and a height of 201 mm. The proposal also deals with the cutting and preheating of the input blank. Die forging is designed in three steps. The selected forging force for the last operation is 30.7 MN. The proposed production press is the LZK 4,000. The LKOA 200 press is selected for finishing cutting operations.

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1 Řiháček, J.
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