Fularski Robert, Filip Ryszard
Department of Gears, Pratt & Whitney Rzeszów S.A., Hetmańska 120, 35-078 Rzeszów, Poland.
Department of Materials Science, Faculty of Mechanical Engineering and Aeronautics, Ignacy Łukasiewicz Rzeszów University of Technology, Powstańców Warszawy 12, 35-959 Rzeszów, Poland.
Materials (Basel). 2021 Mar 1;14(5):1155. doi: 10.3390/ma14051155.
The following article describes influence of pressure welded or bound chips to the gear tooth flank and/or the tooth root on a carburized case and surface layer hardness of Pyrowear 53 steel gears, machined by Power Skiving method. This paper is focused only on one factor, the chips generated while forming gear teeth by power skiving, which could result in local changes in the carburized case parameters as a negatively affecting point of mechanical performance of the carburized case. The chips, due to the specifics of the power skiving process and the kinematics of tooth forming, could be subject to the phenomena of pressure welding or binding of chips to the tooth. During the carburizing stage of the downstream manufacturing processes, the chips form a diffusion barrier, which ultimately could result in localized changes in the carburized case. This work was an attempt to answer the question of how and to what extent the chips affect the case hardening. Performed simulations of chips by a generating cupper "spots", mentioned in the study, represent a new approach in connection with minimization of errors, which could appear during carbon case depth and case hardness analysis for typical chips, generated during the machining process-assurance that a complete chip was bound to the surface. Hardness correlation for zones, where the chip appears with areas free of chips, gives simple techniques for assessment. Performed tests increased the knowledge about the critical size of the chip-1.5 mm, which could affect the case hardening. Obtained experimental test results showed that the appearance of chip phenomena on the gear tooth might have a negative impact on a carburized case depth and hardened layer.
以下文章描述了压力焊接或粘结切屑对经渗碳处理的Pyrowear 53钢齿轮的齿面和/或齿根以及表面层硬度的影响，这些齿轮采用强力切削法加工而成。本文仅关注一个因素，即在强力切削形成齿轮齿时产生的切屑，这可能会导致渗碳层参数的局部变化，成为影响渗碳层机械性能的负面因素。由于强力切削过程的特殊性和齿形形成的运动学原理，切屑可能会出现压力焊接或粘结在齿上的现象。在下游制造工艺的渗碳阶段，切屑会形成扩散屏障，最终可能导致渗碳层出现局部变化。这项工作旨在回答切屑如何以及在多大程度上影响表面硬化的问题。研究中提到的通过生成铜“斑点”对切屑进行模拟，代表了一种新方法，有助于减少在加工过程中产生的典型切屑的碳层深度和表面硬度分析时可能出现的误差，确保完整的切屑粘结在表面。切屑出现区域与无切屑区域的硬度相关性提供了简单的评估技术。进行的测试增加了对可能影响表面硬化的临界切屑尺寸（1.5毫米）的了解。获得的实验测试结果表明，齿轮齿上出现切屑现象可能会对渗碳层深度和硬化层产生负面影响。
