Market competition is increasingly fierce, and production companies must survive among competitors. Product types are becoming more and more abundant, technological innovation and product life cycle are shortening, market saturation is getting higher and higher, and product preparation time is getting longer and longer. The disruption of production due to the introduction of new processes is also increasing.
Stama Machine Tool GmbH in Schlierbach produces both vertical machining centers. A turnkey solution is also available. In the past, the “Golden Spoon†program included not only manufacturing fixtures and tools, but also providing the entire process technology. In the future, by shortening the product life cycle, reducing production batches, and minimizing downtime with equipment with improved performance. The off-air system for machine tools can bring significant improvements in productivity. The standardization of "smart" clamping tools is a decisive factor in the preparation and introduction of workpieces. All standardized tools, such as face milling cutters, reaming drills and thread drills, can be retained in the machine tool magazine. It takes a relatively long time to load additional tools into the magazine and remove unwanted and redundant tools.Too short tool engagement times can have undesirable consequences: even high-performance machine tool magazines cannot prepare for the follow-up tool in a short enough time. This creates additional operating time that is independent of production. Once the follower tool is not ready. The shortest setup time cannot be obtained. This requires the machine tool magazine to be removed in the order in which the program is executed.
However, the method of manually sorting the tools and loading them into the tool magazine involves two serious weaknesses. One weakness is that the existing tools in the magazine need to be moved to another location. Another weakness is that the sister tools necessary for production cannot be correctly located. With the aid of a buffer station, the "Stama Navigation System" is able to sort the tools correctly. Use the first program to arrange the corresponding storage space in the tool magazine, and then complete the machining task in the order of use. Starting with the second program, the tools can be sorted in the correct order. When the tool reaches its end of life, the system automatically calls the corresponding sister tool to the correct position in the magazine. If different programs need to call the same tool in the magazine at the same time, the navigation system can also arrange a reasonable processing sequence to achieve the shortest clamping time. The downtime of the machine depends only on the number of tools to be clamped. In addition, modern machining methods allow the machine to hold the tools needed for the next process while it is being carried out in one process. This “fastest†tool magazine is not based on existing CNC programs, but it can also hold other tools while the machine is performing the main process (Figure 1). While switching the NC program and changing the clamping device, the machine can still deliver the required tool independently in the magazine. In this way, it is possible to automatically change the part family and switch the machining method without human control during the shortest downtime.The “fastest†magazine's statistical software can count the frequency of use of different tools and clean the main tool magazine with the lowest cost tool, so that the number of times of clamping and the resulting non-productive time can be reduced by 70%. .
In a stable process, the optimization of tool operation is decisive for increasing throughput, reducing lead times and cost per piece. In addition to reducing the failure rate of components, the time from production interruption to system restart is an important, but rarely involved, step. Figure 1 Even when the machine is still in the previous process, the tool can be closed: the “fastest†magazine can hold other tools while performing the main process. |
 Figure 2 One-button reset: the operator presses the "Reset Order" button |
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