Grey Relational Optimization of Turning Parameters in Dry Machining of Austenitic Stainless Steel Using Zr Based Coated Tools

The present work aims at the microstructural characterization of TiAlZrN/ Al2O3 and TiAlZrN/Si3N4 coatings deposited via lateral rotating cathodes. The coatings were deposited using Lateral Rotating Cathodes (LARC) technology. The deposited coatings were studied for its cross sectional morphology using scanning electron microscopy. Energy Dispersive Spectrometry was also conducted along the cross section to determine the elemental composition. Micro Vickers hardness test was conducted to determine the hardness of the coatings. The scanning electron microscope images showed that TiAlZrN/Al2O3 coatings showed preferred columnar grain orientation with multilayered structure while TiAlZrN/Si3N4 coatings exhibit a dense grain structure. The TiAlZrN/Si3N4 coating shows a hardness of 31.58 GPa while TiAlZrN/Al2O3 coating shows a hardness of 25.40 GPa. Dry turning tests were performed on AISI 304 stainless steel. The TiAlZrN/Si3N4 coatings show reduced flank wear. Both the coatings even under severe cutting conditions impart surface roughness of less than 1.5 μm.

大切深车削蜗杆工艺技术应用

车削蜗杆的车刀和车削工艺与车削梯形螺纹很相似,但由于蜗杆的齿深较深,车削时比梯形螺纹还困难。提高车削蜗杆的效率,主要是选用弹性强力车刀杆、采用合理的刀具几何参数,增大切削用量、采用正确的加工方法。

机夹可转位不重磨车刀几何参数的选择方法

不重磨车刀选用合理的槽形、先进的几何参数 ,可以改善刀具的切削性能 ,提高刀具的耐用度和使用寿命 ;介绍如何根据加工条件、刀片利用率及刀具耐用度正确地选择刀片形式及尺寸参数、刀具角度参数。