This study provides a proportioning design method for the polycrystalline cubic boron nitride (PcBN) composite based on dense packing theory with the use of the Horsfield dense filling theory and Dinger–Funk equation. Subsequently, three proportioning schemes of the cBN–TiN system were designed with different titanium nitride content. The samples were analysed through X-ray diffraction, scanning electron microscopy and transmission electron microscopy for density, hardness and actual cutting performance, respectively. The predicted optimal values were consistent with the experimental results, which proved the validity of the method. Three samples designed from the method had sufficient sintering reaction under high pressure and high temperature to form a uniform and compact sintering structure, which had excellent mechanical properties to meet the industrial application. A surface reaction zone was formed on the W grains and the substitution reaction between cBN and TiN occurs and directly combines with each other to form an obvious grain boundary. It also indicated that appropriate PcBN proportioning scheme, workpiece characteristics, and cutting parameters should be sufficiently considered and reasonably adjusted in order to achieve a higher tool life and excellent workpiece surface roughness in the actual cutting application.

这项研究提供了一种基于致密堆积理论并利用Horsfield致密填充理论和Dinger-Funk方程的多晶立方氮化硼（PcBN）复合材料的比例设计方法。随后，设计了三种氮化钛含量不同的cBN-TiN体系配比方案。通过X射线衍射，扫描电子显微镜和透射电子显微镜对样品进行密度，硬度和实际切割性能的分析。预测的最佳值与实验结果吻合，证明了该方法的有效性。根据该方法设计的三个样品在高压和高温下具有足够的烧结反应，以形成均匀且致密的烧结结构，具有优异的机械性能，可满足工业应用。W晶粒上形成了一个表面反应区，cBN和TiN之间发生了取代反应，并直接相互结合形成了明显的晶界。它还表明，应充分考虑并适当地调整适当的PcBN配比方案，工件特性和切削参数，以便在实际切削应用中获得更长的刀具寿命和出色的工件表面粗糙度。