Investigations Regarding Process Stability Aspects in Thread Tapping Al-Si Alloys. (2015)

• Record Type: Journal Article
• Authors: Steininger, Andreas; Siller, Anton; Bleicher, Friedrich
• Is Part Of: Procedia engineering. Volume 100(2015)
• Page Start: 1124
• Page End: 1132
• Publication Date: 2015
• Subjects: Tapping -- Adhesion -- Aluminium alloy -- chips -- tool coatings; Engineering -- Congresses; Engineering -- Periodicals; Engineering; Conference proceedings; Periodicals; 620.005
• DOI: 10.1016/j.proeng.2015.01.475
• Languages: English
• ISSNs: 1877-7058

Abstract

Abstract: The large number of drills and taps in automotive powertrain components make these processes to a considerable machining step. Due to the fact that hypereutectic Al-Si alloys tend to adhere on the tool surface, the machinability of these alloys is challenging. Especially the adhesion of Al has a negative influence on the chip transportation and leads to an increase of stochastic inclinations of clogging the chip flute. A variety of physical vapour deposition (PVD) coatings like TiCN, CrN, TiB2 on carbide metal taps have been tested in machining experiments. Also two types of DLC coatings have been compared in the tests. In order to improve the chip transportation, the tribological effects were determined by investigating the affinity of build-up edge and aluminium adhesion in the rake flank. Results are discussed in terms of materials, which are fit for purpose of automotive powertrain machining steps.