Abstract Form tapping of automotive engine grade Al–12Si die-cast alloy faces critical challenges with severe wear of form tap and short tool life. Typically, the lobes of the entry taper of the uncoated tap are progressively worn by both abrasion and adhesion wear. This study is focussed on the evaluation of the coating performance of 10 different PVD coatings to determine the best wear-resistant coating for this application. A novel thin multilayered in-house developed TiAlN coating performs the best in the progressive wear tests. An in-depth wear evaluation was conducted for the selected PVD coatings of the tested taps. A common wear pattern was identified for thin hard coatings on form taps for high silicon content aluminum alloy. In addition, a detailed investigation of the wear mechanisms has shown that coating fractures along the edges of the lobe in a form tap.

中文翻译：

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铝硅合金攻丝成形丝锥PVD涂层磨损机理研究

摘要 汽车发动机级Al-12Si压铸合金攻丝面临攻丝严重磨损和刀具寿命短的严峻挑战。通常，无涂层丝锥的入口锥度的凸角会因磨损和粘附磨损而逐渐磨损。本研究的重点是评估 10 种不同 PVD ​​涂层的涂层性能，以确定最适合该应用的耐磨涂层。内部开发的新型薄多层 TiAlN 涂层在渐进式磨损测试中表现最佳。对测试丝锥的选定 PVD ​​涂层进行了深入的磨损评估。对于高硅含量铝合金的成型丝锥上的薄硬涂层，确定了一种常见的磨损模式。此外，