CAJ | 학술논문

干硬切削加工过程中产生的表面白层对零件的使用性能和使用寿命有很大影响,对白层厚度进行准确的定量预测具有重要的理论意义与应用价值.基于材料的化学热力学基本理论,对切削过程中合金元素、应力、应变等因素耦合影响下的奥氏体相变温度进行了理论推导,根据计算出的相变温度和有限元的模拟结果,建立了基于相变形成相理的白层厚度预测模型.GCr15淬硬钢试验结果与预测结果对比分析表明,本模型适用于热力耦合占主导地位的切削过程,该模型能够在考虑了热-力耦合因素的情况下更为准确地预测出干硬切削表面相变白层的厚度.
간경절삭가공과정중산생적표면백층대령건적사용성능화사용수명유흔대영향,대백층후도진행준학적정량예측구유중요적이론의의여응용개치.기우재료적화학열역학기본이론,대절삭과정중합금원소、응력、응변등인소우합영향하적오씨체상변온도진행료이론추도,근거계산출적상변온도화유한원적모의결과,건립료기우상변형성상리적백층후도예측모형.GCr15쉬경강시험결과여예측결과대비분석표명,본모형괄용우열력우합점주도지위적절삭과정,해모형능구재고필료열-력우합인소적정황하경위준학지예측출간경절삭표면상변백층적후도.
White layer produced during hard machining process has great influence on the usability and working life of parts, thus the accurate and quantitative prediction for white layer thickness has important theoretical significance and application value. Based on the basic theory of material chemical thermodynamics, the theoretical derivation of austenitic phase transformation temperature influenced by coupling factors including alloying elements, stress, strain is carried out, on the basis of the calculated phase transformation temperature and the finite element simulation results, the prediction model of white layer thickness on the basis of phase transformation mechanism is established. The contrastive analysis of the experimental and prediction results for GCr15 hardened steel shows that this model is suitable for the cutting process dominated by thermal-mechanical coupling and can predict the thickness of phase transformation white layer in dry and hard machining more accurately considering the thermal-mechanical coupling factors.