Váňa Martin, Dvořáčková Štěpánka, Knápek Tomáš, Kroisová Dora
Assembly and Engineering Metrology, Department of Machining, Faculty of Mechanical Engineering, Technical University of Liberec, 461 17 Liberec, Czech Republic.
Polymers (Basel). 2024 Sep 16;16(18):2620. doi: 10.3390/polym16182620.
The present study focuses on the elimination of delamination during the drilling of a linen-based biocomposite material in epoxy resin used for the manufacture of sports kayaks, depending on the tool material, cutting conditions, and the use of additional wooden support plates. In the present study, HSS (high-speed steel) and Carbide cutting tools without coatings, with the same geometry and two types of cutting conditions (n = 1500 rpm, f = 0.05 and 0.1 mm/rev) were used. A Sololite-type wooden backing plate was used to aid in reducing delamination. The results show that the additional support plates significantly reduced delamination by up to 80% both at the material inlet and especially at the drill hole outlet. In this study, the use of a lower feed rate (f = 0.05 mm/rev) per tooth was shown to have a significant effect on reducing the delamination of biocomposite materials with flax fibers, which are generally known to be difficult to machine. The Carbide cutting tool shows significantly better results both in terms of its wear and in terms of delamination of the biocomposite material. The highest delamination was obtained without the use of a backing board at the tool exit after 50 drilled holes of 3509 µm. With the use of a backing board, this delamination decreased to 693 µm after 50 drilled holes.
本研究聚焦于在用于制造运动皮划艇的环氧树脂中钻亚麻基生物复合材料时分层现象的消除，这取决于刀具材料、切削条件以及是否使用额外的木制支撑板。在本研究中，使用了具有相同几何形状且无涂层的高速钢（HSS）和硬质合金切削刀具，以及两种切削条件（转速n = 1500转/分钟，进给量f = 0.05和0.1毫米/转）。使用了一种Sololite型木制垫板来帮助减少分层。结果表明，额外的支撑板在材料入口处，尤其是在钻孔出口处，能显著减少分层，减少幅度高达80%。在本研究中，每齿使用较低的进给量（f = 0.05毫米/转）对减少含亚麻纤维的生物复合材料的分层有显著效果，而亚麻纤维通常被认为难以加工。硬质合金切削刀具在磨损以及生物复合材料的分层方面均显示出明显更好的结果。在钻出50个直径为3509微米的孔后，在刀具出口处不使用垫板时获得的分层最高。使用垫板后，钻出50个孔后的分层减少到了693微米。
