基于TOPSIS和CRITIC的齿轮坯闭式热模锻工艺方案评估

目的 基于热力耦合机理，应用模型数值仿真和多参数化的评价机制，实施方案寻优，从而提升齿轮坯闭式热锻工艺的设计效率和成形质量。方法 基于DEFORM仿真软件对某工程齿轮坯锻件的3种闭式热模锻成形工艺方案进行CAE仿真分析，研究其金属塑性流动规律，并采用TOPSIS(Technique for Order Preferences by Similarity to Ideal Solution)和CRITIC(Criteria Importance Though Intercrieria Correlation)相结合的方法，构建以应变、应力、载荷、充填性、磨损等8个评价指标的评估模型及权值计算方法，进行工艺方案评估。结果 通过仿真可以发现不同的预锻方案，金属塑性流动方式不同，成形结果不同，其中方案1未填满，成形有毛刺，受载不均匀，模具损伤值较大；方案2受载均匀，填充饱满，模具磨损深度大，等效应力大；方案3成形质量较好，但受载不均匀，且同样模具磨损深度大，等效应力大；综合考虑锻件成形质量和模具使用寿命，通过指标同向标准化处理、权重计算，得到方案1、2、3贴近程度分别为0.446、0.511、...

Evaluation of Closed Hot Forging Process Scheme for Gear Blank Based on TOPSIS and CRITIC

Objective Based on the thermal coupling mechanism the numerical simulation of the model and the evaluation mechanism of multi-parameters are applied to implement the optimization of the scheme so as to improve the design efficiency and forming quality of the closed hot forging process of gear blanks. Methods A CAE simulation based on DEFORM was conducted to analyze three closed hot forging forming process schemes for an engineering gear blank forging. The simulation analysis investigated the plastic flow pattern of the metal under the hot forging process. Based on this this paper adopted a combined evaluation method of TOPSIS a technique for order preferences by similarity to ideal solution and CRITIC criteria importance through intercriteria correlation . It constructed an evaluation model with eight evaluation indicators including strain stress load compaction wear etc. and a weight calculation method to evaluate the process scheme. Results In the simulation different pre-forging solutions had different plastic metal flow patterns which in turn led to different forming results. The simulation results of option 1 showed that gear blanks were not filled had burrs and were not uniformly loaded with a significant mold damage value. The simulation results of option 2 showed that gear blanks were uniformly loaded and filled but the mold wear depth was large and the equivalent force was high. The simulation results of option 3 showed that the gear blanks were formed with good quality but they were not uniformly loaded and the mold wore to a large depth and the equivalent force was high. Considering the forging forming quality and mold service life comprehensively the index weights were calculated by isotropic standardization of different indexes and the degrees of closeness of options 1 2 and 3 were obtained as 0. 446 0. 511 and 0. 556 respectively. The results showed that option 3 had the largest value and the best results. Process tests were conducted for option 3 and the gear blanks were obtained with full filling and no folding defects. Conclusion The combination of finite element numerical simulation and evaluation models allows for an accurate and efficient evaluation of the advantages and disadvantages of closed hot forging process solutions. This method can improve the design efficiency and forming quality of the closed hot forging process of gear blanks.