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1
Content available The Use of Formal Knowledge Representation in Operating on Resources Concerning Cast Iron Processing
Kluska-Nawarecka S., Wilk-Kołodziejczyk D., Rojek G., Regulski K., Polek G.
Archives of Foundry Engineering
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2015
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Vol. 15, iss. 2
39--42
EN
The problem of materials selection in terms of their mechanical properties during the design of new products is a key issue of design. The complexity of this process is mainly due to a multitude of variants in the previously produced materials and the possibility of their further processing improving the properties. In everyday practice, the problem is solved basing on expert or designer knowledge. The paper is the proposition of a solution using computer-aided analysis of material experimental data, which may be acquired from external data sources. In both cases, taking into account the rapid growth of data, additional tools become increasingly important, mainly those which offer support for adding, viewing, and simple comparison of different experiments. In this paper, the use of formal knowledge representation in the form of an ontology is proposed as a bridge between physical repositories of data in the form of files and user queries, which are usually formulated in natural language. The number and the sophisticated internal structure of attributes or parameters that could be the criteria of the search for the user are an important issue in the traditional data search tools. Ontology, as a formal representation of knowledge, enables taking into account the known relationships between concepts in the field of cast iron, materials used and processing techniques. This allows the user to receive support by searching the results of experiments that relate to a specific material or processing treatment. Automatic presentation of the results which relate to similar materials or similar processing treatments is also possible, which should make the conducted analysis of the selection of materials or processing treatments more comprehensive by including a wider range of possible solutions.
2
Content available The Production of Plaster Molds with Patternless Process Technology
Pastirčák R., Sládek A., Kucharčíková E.
Archives of Foundry Engineering
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2015
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Vol. 15, iss. 2
91--94
EN
The work deals with technology Patternless process that combines 3 manufacturing process mold by using rapid prototyping technology, conventional sand formation and 3D milling. It's unconventional technology that has been developed to produce large-sized and heavy duty castings weighing up to several tons. It is used mainly in prototype and small batch production, because eliminating production of models. The work deals with the production of blocks for making molds of gypsum and gypsum drying process technology Thermomold. Into blocks, where were made cavities by milling were casted test castings from AlSi10MgMn alloy by gravity casting. At machining of the mold cavity was varied feed rate of tool of cemented carbide. Evaluated was the surface roughness of test castings, that was to 5 micrometers with feed from 900 to 1300 mm/min. The dimensional accuracy of castings was high at feed rate of 1000 and 1500 mm/min did not exceed 0.025 mm.
3
Content available Improving the Organization of Iron Casts Finishing Processes
Kukla S.
Archives of Foundry Engineering
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2015
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Vol. 15, iss. 2 spec.
55--58
EN
The paper presents issues of production processes improvement in foundries in terms of finishing treatment of iron casts on grinding workstations. Basing on the conducted analysis of work ergonomics on the grinding line and the observation of work at workstations, a range of improvements related to organizing grinding treatment processes was proposed. In order to visualize the production system functioning and estimate its efficiency, a simulation model of a grinding line has been created, on which a simulation experiment was carried out. Due to many factors influencing the effectiveness of processes, it was suggested to use multi-criteria evaluation tools to choose the most rational solution. Three criteria have been assumed, according to which particular improvement variants were evaluated. Also, criteria weights have been set according to the Saaty’s method, and particular solution variants have been assessed separately with respect to each criterion. On the basis of the presented course of action, the best solution has been selected from among the analyzed options.
4
Content available Multi-Criterion Assessment of Different Variants of Casts Manufacturing Processes
Kukla S.
Archives of Foundry Engineering
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2014
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Vol. 14, iss. 3
47--50
EN
The paper presents the issue of production processes improvement in foundries in the area of finishing treatment of iron casts manufactured on automated foundry lines with vertical or horizontal mould division. Due to numerous factors which influence the efficiency of the processes, multi-criterion assessment tools were proposed in order to select the optimal solution for the assumed criteria. After determining the criteria weight using the Saaty method, a simulation experiment was designed and carried out which presents possible scenarios of casts finishing treatment operations. Basing on experiment reports from a computer model, particular solutions were evaluated using the Yager’s method. The evaluation of the experiment results was performed by experts who assessed different options according to each of the criteria adopted. After the establishment of the total standardized ratings by averaging the scores given by individual experts, the final decision was generated. Using the presented method, the best solution was chosen from among the analyzed scenarios.
5
Content available Virtual factory as a method of foundry design and production management
Stawowy A., Wrona R., Brzeziński M., Ziółkowski E.
Archives of Foundry Engineering
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2013
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Vol. 13, iss. 1
113--118
EN
The paper outlines the methodology of virtual design of a foundry plant as a system. The most important stage in the procedure involves the development of a model defined as a set of data about the system. Model development involves two stages: defining the model’s architecture and specifying the model data in the form of parameters and input-output relationships. The structure is understood as configuration of machines and transport units, representing the sub-systems and system components. As the main purpose of the simulation procedure is to find the characteristics of the system’s behaviour, the merits of the iterative method involving analysis, synthesis and evaluation of results are fully explored.
6
Content available The rationalization of automatic units for HPDC technology
Herman A.
Archives of Foundry Engineering
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2012
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Vol. 12, iss. 2
29-34
EN
The paper deals with problem of optimal used automatic workplace for HPDC technology - mainly from aspects of operations sequence, efficiency of work cycle and planning of using and servicing of HPDC casting machine. Presented are possible ways to analyse automatic units for HPDC. The experimental part was focused on the rationalization of the current work cycle time for die casting of aluminium alloy. The working place was described in detail in the project. The measurements were carried out in detail with the help of charts and graphs mapped cycle of casting workplace. Other parameters and settings have been identified. The proposals for improvements were made after the first measurements and these improvements were subsequently verified. The main actions were mainly software modifications of casting center. It is for the reason that today's sophisticated workplaces have the option of a relatively wide range of modifications without any physical harm to machines themselves. It is possible to change settings or unlock some unsatisfactory parameters.
7
Content available remote Maintenance system improvement in cast iron foundry
Kukla S.
Archives of Foundry Engineering
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2011
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Vol. 11, iss. 3
185-188
EN
The work presents the issue of technical equipment management in an iron foundry basing on the assumptions of the TPM system (Total Productive Maintenance). Exploitation analysis of automatic casting lines has been carried out and their work's influence on the whole production system's functioning has been researched. Within maintenance system improvement, implementation of autonomic service and planned lines' review have been proposed in order to minimize the time of breakdown stoppages. The SMED method was used to optimize changeover time, and the OEE (Overall Equipment Effectiveness) was applied to evaluate the level of resources usage before and after implementing changes. Further, the influence of the maintenance strategy of casting devices' efficiency on own costs of casting manufacture was estimated.
8
Content available remote Production system rationalisation on the example of iron foundry
Kukla S.
Archives of Foundry Engineering
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2010
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Vol. 10, iss. 2
209--212
EN
The present paper presents a systemic approach to foundry management. Thanks to production process modelling and simulation techniques, an attempt was made to synthesis many interconnected devices and numerous manufacturing stages into one production system. In the beginning, a factor analysis was carried out of the research object, which is a system of iron castings manufacture on automated foundry lines. On the basis of a simulation experiment, use the accessible production resources and manufacturing own cost of castings were analysed, depending on batch content and melting order, choice of an automatic line and the model of line fed with cast iron, sequence of order realization and the size of production lots. Simulation experiments were carried out on a computer simulation model prepared in the Arena packet produced by Rockwell Automation. Cost was estimated on the basis of additional calculation according to cost centres basing on factory spreadsheet.
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