Steel construction materials are very common use for factory and high building in nearly years. Generally speaking the steel construction material is refers has the fixed cross section the steel products. Like rolling H, the T section, the light channel steel, the angle steel and so on all are. But their order characteristic for depends on the length order, also can be different regarding the different length its unit weight price. Manages in not the easy situation in the present enterprise, saved the material cost already to change can it be that is often important, All company shall consider for its huge material storage. Regarding the company huge stock information bank system in, frequently the existence permits the material which how long year hasn't used, finally really very is big by the waste treatment regarding company's loss. So material cutting plane is an important work for those fabrication company. A good cutting plane is directly effect the used percentage, material cost, transportation cost, moving efficiency are also an important effects points, Therefore a good combination for cutting plan can obvious lower material cost, also good help for cutting efficiency, The research of Tabu search shall be use to steel construction material combination and becoming an good effective calculation method to reach three purpose as follow: 1.Considers the multi-objective of material fixed number of years, the spillage of material and the material cost, that material best arrangement combination solution or approximate best solution. 2.Develop algorithm for actuality using in materials combination so all fabrication company can use this method to reduce their cost. 3.Collection all remain material and make it together to save moving time. The result showed obtains the solution by the Tabu Search method to be possible the effective reduced material purchase quantity; also remainder centralism also has the very good improvement.

Firms specializing in the construction of large commercial buildings and factories must often design and build steel structural components as a part of each project. Such firms must purchase large steel plates, cut them into pieces and then weld the pieces into H-beams and other construction components. The details of the order and the production operation are specified in the "cutting plan." This dissertation focuses on solving this "cutting plan generation" problem with the goal of minimizing cost. Two solution approaches are proposed in this dissertation: a multi-expert system and an evolutionary algorithm. The expert system extends the field by relying on the knowledge of multiple experts. Furthermore, unlike traditional rule-base expert systems, this expert system (XS) uses procedural rules to capture and represent experts' knowledge. The second solution method, called CPGEA, involves development of an evolutionary algorithm based on Falkenauer's grouping genetic algorithm. A series of experiments is designed and performed to investigate the efficiency and effectiveness of the proposed approaches. Two types of data are used in the experiments. Historical data are real data provided by a construction company. Solutions developed manually and implemented are available. In addition, simulated data has been generated to more fully test the solution methods. Experiments are performed to optimize CPGEA parameters as well as to compare the approaches to each other, to known solutions and to theoretical bounds developed in this dissertation. Both approaches show excellent results in solving historical cases with an average cost 1% above the lower bound of the optimal solution. However, as revealed by experiments with simulated problems, the performance decreases in cases where the optimal solution includes multiple identical plates. The performance of the XS is affected by this problem characteristic more than that of CPGEA. While CPGEA is more robust in effectively solving a range of problems, the XS requires substantially less processing time. Both approaches can be useful in different practical situations. / Ph. D.

The master’s thesis elaborates an optimum proposal of the production technology of a cutting – a part made of steel plate 11 320.3. The theoretical part represents the problematic issue of cutting technology and on the basis of this part was designed a production of components in processual tool. The processual tool is composed of normalized components and is resolved by using a easel, which is attached into the eccentric press LEXN 100 C (producer Toma Industries) with the nominal drawing force of 1000 kN. The press was chosen on the basis of technological calculations. The work contains necessary calculations, economical evaluation and design documentation of the cutting tool for the components production. The last part contains the technical and economic evaluation of the recently designed technology.

This thesis introduces issues of passenger car side-door hinges. Practical part of this thesis deals with modifying the current low-cost side-door hinge for Edscha Automotive Kamenice s.r.o. First, material was chosen to decrease weight while maintaining the required mechanical properties. Then follows the detail design of the hinge model, which was created in the software program Catia. Heat and surface treatments are described. Both treatments ensures the hinge's final features. To verify the strength of the hinge, tensile and sag test was simulated in Ansys. Subsequently, record from the consultation of the hinge's manufacturability in series and the hinge’s cutting plans are provided. At the end of the thesis, the assembling procedure is suggested. Final part of the thesis compares the developed low-cost hinge against two similar side door hinges.