Optimized workpiece clamping systems for automated micro production

摘要

Micro machining becomes more and more important for a wide range of applications. In medical technology - to name only one example - many biocompatible parts are produced by machining shape memory alloys or titanium alloys. All of these fields require repeatable and stable machining processes as well as high accuracy to ensure safe industrial processes. However, most of the machine tools are relatively large compared to the size of the workpieces or structures they have to produce. An alternative approach is the use of size-adjusted machine tools. This new machine concept particularly benefits from a space-saving design as well as high flexibility and mobility. Also, these machines need size-adjusted components, like workpiece clamping systems or spindles. One crucial element in machining processes is the workpiece clamping system. Its key function is the fixation of workpieces. The clamping system must absorb occurring process forces. High stiffness is also necessary to resist under load so that a high dimensional accuracy is achieved and deformations are avoided. Another claim is high flexibility regarding not only the workpiece shape but also its material. Previously performed investigations have shown that magnetic and adhesive clamping systems offer all of the mentioned specifications. This paper presents two size-adjusted workpiece clamping systems, that are set up accordingly to these clamping principles. The clamping systems are designed to be used in automated production tasks. They were also extensively tested in micro machining environment regarding their overall performances like clamping forces for instance.