Development of Novel Plastic Working Method for Enlargement Partial Diameter on Shaft

1.提出了适用于实际尺寸轴的扩径变形行为模型，利用自行研制的加工机床进行了扩径加工实验，测量了扩径变形行为，并设计了行为的表达模型。根据加工影响因素，如加工条件、直径、轴材料等，对扩径变形行为进行估算。2.提出提高扩径工艺可加工性的热处理方法我们对中碳钢进行了适当的热处理，以获得适合该工艺的细小、均匀的组织。结果表明，获得了强韧性最佳平衡的材料，提高了稳定加工工艺的合理判据。此外，我们还提出了…3.扩径加工实验和强度校核实验我们对每种试件材料从实验尺寸到实际尺寸的多个轴进行了扩径加工实验和强度校核实验。不仅从实验上而且从分析上证实了处理方法的有效性和对疲劳损伤的可靠性。4.加工方法分析方法的发展利用有限元通用程序MSC的用户子程序，开发了一种热-应力耦合分析方法。马克。加工过程模拟分析与实验结果吻合良好，验证了该方法的正确性和有效性。5.加工方法基础数据库的建立在实验和有限元模拟分析的基础上，明确了加工条件对各试件材料扩径行为和强度可靠性的影响，建立了基于加工方法的基本加工数据库。较少

We have advanced steadily the research project and got excellent results as follows.1.Proposition to model deformation behavior of diameter-enlargement with applicable to shaft of practical sizeWe have carried out diameter-enlargement processing experiments with the processing machine developed originally, measured diameter-enlargement deformation behaviors, and designed expression model of the behaviors. The diameter-enlargement deformation behaviors, according to processing influence factors, i.e. processing conditions, diameter, shaft material etc., come to be estimated by the model.2.Proposition of heat-treatment method to improve workability of diameter-enlargement processWe have heat-treated properly to medium carbon steel in order to obtain a minute, homogeneous organization appropriate for the process. As the results, we have obtained material with best balance of strength and toughness, and improved sound criteria of stable machining to the process. Moreover, we have proposed … More a more effective diameter-enlargement processing method by high frequency inducement heating.3.Execution of diameter-enlargement processing experiment and strength verification experimentWe have conducted diameter-enlargement processing experiments and strength verification experiments on many shafts in diameter range from experimental size to practical size in each sample material. We have confirmed effectiveness of the processing method and soundness to fatigue damage not only experimentally but also analytically. Moreover, we put lightening shaft in view, and have experimentally clarified the application possibility of the processing method to hollow shaft.4.Development of analytical method for the processing methodWe have developed a thermal-stress coupled analysis method by using user subroutines of finite element method general-purpose program MSC. Marc. Validity and effectiveness of the method have been confirmed from the good simulation analysis on processing process agreement with the experiment results.5.Construction of basic data base concerning the processing methodWe have clarified the influence of processing conditions on the diameter-enlargement behavior in each sample material and the strength reliability based on both the experiment and the finite element method simulation analysis, and constructed a basic processing data base on the processing method. Less