A. Löwenstein's research while affiliated with Fraunhofer Institute for Production Systems and Design Technology IPK and other places
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Publications (9)
In micro milling, which is mostly used in mold and die making, process reliability and predictability of tool failure are important. Particularly in precision and micro machining, tool breakage is hardly detectable and the requirements on accuracy are very high. Immersed tumbling is an appropriate process for the defined cutting edge preparation of...
A main reason for premature tool failure in micro milling is the irregular wear behavior of the cutting tools. An approach to improve the tool wear behavior is a defined cutting edge preparation using immersed tumbling. A particular challenge is the cutting edge preparation of micro milling tools with small diameters D ≤ 0.5 mm. High loads within t...
Die Prozesssicherheit beim Mikrofräsen lässt sich mit einer gezielten Schneidkantenverrundung erheblich steigern. Dabei werden durch verschiedene Präparationstechnologien unterschiedliche Geometrien und Einflüsse auf den Fräsprozess erzeugt. Der Fachbeitrag behandelt den Einsatz präparierter Mikrowerkzeuge in Zerspanversuchen, in denen auf die Zers...
Vorgestellt wird ein Maschinenprototyp zur Feinbearbeitung von Werkstückkanten und -oberflächen. Dieser verfügt über integrierte optische Messtechnik, die zur Kontrolle der Bearbeitungsergebnisse und gegebenenfalls zur automatisierten Nachbearbeitung eingesetzt werden kann. Mit dem Prototypen werden zum einen Fräswerkzeuge präpariert und zum andere...
Micro milling is commonly used industrially for the production of precision components. Premature tool wear is usually the reason for a short tool life of cemented carbide end mills. An approach to improve the tool wear behavior is the defined cutting edge preparation. In this contribution, experimental investigations on the formation of cutting ed...
The continuous demand concerning the enhancement of functionality and power of technical and mechanical products, such as sensors, actuators and mechatronical systems leads to a steady miniaturization. Application fields located in the automotive industry, consumer electronics, medical and biological engineering, have shown that the fabrication of...
Citations
... They found that magnet finishing, and immersion tumbling improved the tool performance in a matter of resulting forces Fz by 7.5 %, and 14 %, respectively, compared to brush polishing and polish blasting. Tool wear was reduced by 9 % compared to brush polishing and by 13.2 % compared to polish blasting [19]. The effect of cutting temperature on the tool life of cemented carbide drills was examined in the publication [20]. ...
![[object Object]](https://i1.rgstatic.net/ii/profile.image/464509094633473-1487759006737_Q64/D-Oberschmidt.jpg)
... Tool edge geometry has significant importance in machining operations as it influences the cutting process by affecting the cutting forces, residual stresses, temperatures, and surface finish quality. Various methods of tool edge manufacturing with optimised conditions are available to attain the anticipated precision [1][2][3]. Besides manufacturing, the reliable measurement of miniature and micro tools is challenging and is necessary for modern computer numerical control (CNC) machines to manufacture parts accurately. ...
... If the honed size and shape is not appropriate, it will boost the cutting force in the early cutting stage and will also result in edge loss or significant wear occurring. Abrasive stirring technique has been used by Uhlmann, Oberschmidt, Kuche, and Löwenstein (2014) for honing of the milling tools with a rounded edge radius of 4 μm/8 μm. They were able to reduce the flank wear land by only 14% compared to unprepared end mill samples. ...
