The feed axes of computer numerical control (CNC) grinding machine tools are among the most mechanically stressed components of machine tools owing to the high process forces and rough manufacturing environment which they encounter. The resulting wear and tear depends strongly on the product range and the manner of machine operation. To counteract a functional deficiency of these central machine units, the current usual approach is preventive maintenance. The manual inspection of feed axes is complex and time consuming. A complicating matter is that the deterioration normally progresses very slowly and depends on the position of the stress along the axis. Existing approaches to automated estimation of the 'health status' of feed axes do not take this factor into account. This paper presents a procedure that addresses this gap. During simple test routines, the drive current, axis position, and feed rate are recorded. With the help of additional machine data, characteristic values are computed directly at the computer of the human-machine interface (HMI). The results are then transferred to and stored on a database server at the machine manufacturer. This approach enables the service technician to trace the progression of the axes' 'health status' over a long time. This approach makes it possible to detect trends in the characteristic values at an early point in time. This leads to a better planning of necessary maintenance actions adapted to the remaining lifetime of the wearing component
This article describes how an IPS² network should be build up by considering the dynamic behavior of the IPS² along its life-cycle. How the network partner could participate and how they allocate their capacities will be also discussed as questions regarding the commissioning by considering the business model. The realization of this concept is based on a multi-agent system. Therefore all service delivery involved IPS² objects like product, network partner and service technicians are represented by software agents. All this will be pointed out by an availability oriented maintenance scenario in the field of micro production.
Keywords:Industrial Product-Service Systems; IPS²; Organization; Multi-Agent System; IPS² Network
MOTIVATIONIndustrial Product-Service Systems (IPS²) can be characterized by the fact that they consist of a combination of tangible product and intangible service shares, whose service shares provide a value to the customer via the complete life-cycle [1] [2]. In the different function-, availability-or result-oriented use models [3] the order for the service performance is either given by the customer (function-oriented) or by the provider (availability-/result-oriented). Overall Industrial ProductService Systems deliver value in industrial application for the customer [4]. But this objective is just attractive for the IPS² provider if he gains an acceptable profit by offering this solution. To reach this win-win situation the operation of the IPS² respectively the service delivery has to be organized efficiently. This includes the internal structure of the IPS² provider as well as the buildup of the IPS² network and its control. The cooperation of companies is one of the main aspects of organizations in the service sector. The reasons are high efficiency of value creation and flexible combination of complementary resources by keeping economical independency [5]. The approach to be shown will point out the typology of the service supply chain under the context of the different targets of delivery flows. Due to that each IPS² has got its own network as well as the dynamic of the IPS² and the connected dynamic of each IPS² network, the establishing and control of the IPS² delivery becomes very complex for the IPS² provider. This challenge can be managed just by an information and communication technology (ICT) support. This system has to merge automatically the IPS² network depending on the characteristics of the IPS², its tasks and on the prospective network partner. Further on it has to control the planned delivery processes. Therefore the basis of such a system has to be the automated communication within the network as soon as a concept to handle this in an efficient way by autonomous decisions of system parts considering the current circumstance of each decision. A multi-agent software system will provide the needed advantages. After the software agents are set they will bargain autonomous about the different objectives in the determined borders. The coordination of the distributed s...
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