In the paper, by way of background, the role of Polish furniture industry in the world and in Europe is discussed and current trends in the fi eld of furniture manufacturing management are presented. Further, an analysis of the technological process in a furniture company is performed and the research questions are identifi ed. Based on this, the main aim of the research is provided-a concept of a new lean production control system based on Glenday sieve, artifi cial neural networks and simulation modeling. The aim of the present approach is to plan and execute the production program effectively and maximize the use of workstations at variable and hardly predictable demand for sets of furniture. The paper presents the methodological approach, results and discussion on the suggested solution.
The paper presents technical aspects of relocation of production and assembly lines. Preparatory stages of relocation, its course, planning and execution, way and process of reaching the assumed mechanical and stability parameters are described. The authors are focused on crucial issues limiting risk: securing supplies to customers by properly large inventory, personnel training and process standardization, transport activities, line assembly after relocation and reaching the target productivity. Effects of relocation on failure and productivity rates are presented. The analysis is based on the data acquired before relocation, in its course and after its completion, as well as during the stages of putting into operation and reaching the required productivity.
Abstract. Modelling and simulating discrete production processes issues were discussed in this paper. Electric scooter production line at the start-up stage was analysed. Requirements towards its efficiency were change before the line going on-line. Simulation model used production plans, drafted prior to starting production. It considered among other adding machinery, increase production capacity, process of production and transport, transport routes, layout, material flow, human resources and means of transport.The manufacturing process was designed to use KANBAN. Hence simulation models including various alternative solutions of Technical and Organisational Production Set-up were used to verify whether 12 minute cycle time was achieved. Modification to the production system included among other interchangeability of workstations and operators. Consequently bottle necks in the production process were eliminated.The project discussed in this paper proves feasibility and validity of combining simulation of production systems with Lean Manufacturing tools.
Abstract. In the engineering industry, where the main waste is metal shavings, it can be sent for reprocessing and recovered. It is completely different in the case of organic waste, e.g., sawdust or straw. From the point of view of energy recovery, they can be burned. At this point, the question arises how to realize the idea of obtaining energy from organic waste? Wood chips or sawdust are burning very quickly and are in a loose form, which makes furnace power quite bothersome. In order to extend their burning period and improve the comfort of use, it is possible to use the pressing process. The high degree of compaction of the material means that the combustion takes much longer. Briquetting presses are devices that convert uncomfortable waste into a useful product. The article presents the process of a briquetting press design − from the idea, through the design and technology development, strength calculations and the implementation of a simulation model that verifies production assumptions. The design stage of the project contains a detailed description of the dimension selection of the elements of the main hydraulic cylinder. First, calculations of the basic parts of the actuator were made. The next step was to check the individual parts using FEM. In the case of the actuator, the analysis concerns the pressing process and the return stroke. The technological stage of the project includes the selection of the appropriate technology of machining of each of the seven main elements of the actuator. The simulation phase of the project uses the model of the company's production processes. The analysis showed the necessity of providing additional storage areas in the area of production halls and providing an additional number of operators. At this stage, the assumptions regarding the number of deliveries, the size of the production batch, routes and the choice of means of transport were verified.
3D printing methods are constantly gaining in popularity among investors, allowing for the production of products with a complex structure, and also used in the production of products with increasingly longer production series. It is planned to build factories (or those already under construction) in which 3D printing devices are the basic production devices. It is therefore important to develop guidelines and recommendations for layout design principles for additive technologies’ devices. A question should be asked: will the development of a layout for additive technology machines in future factories differ from the preparation of a layout plan, for example, removal machining devices? Is it safe to assume that the mathematical methods of optimizing the layout of Computerized Relative Allocation of Facilities Technique (CRAFT), Computerized Relationship Layout Planning (CORELAP), and Modified Spanning Tree (MST) workstations or Schmigalla triangles will also work for 3D printing machines and devices? In search of answers to these questions, the article will attempt to apply a selected mathematical method to optimize the layout of workstations when machines and devices of additive technology are deployed for the assumed technological process and implemented according to frequently used Selective Laser Sintering (SLS) and Selective Laser Melting (SLM) technologies. A sample layout will be prepared for the assumed production plan and selected 3D printing technologies. Requirements and guidelines relevant to the development of layout plans will be collected regarding the necessary space, installations, and connections.
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