科创中国

注塑模设计过程中,冷却水道布局的好坏,关系到塑件的成型质量和成型周期.以某深腔塑件为例,阐述了CAE技术在注塑模冷却水道优化设计中的应用方法和意义.

There is less research on vertical sculptured grinding technology.Especially in high vertical surface grinding process with the cup abrasive wheel,the thermal damage is prone to happen and undermine the grinding surface integrity.This problem limits to improve the grinding efficiency and the grinding ratio greatly.Through the analysis of vertical surface grinding process and features in depth,this paper revealed the inherent mechanism of higher grinding temperature in the process of vertical sculptured grinding using the cup wheel.Based on the previous research achievements,the grinding experiments on TC4(Ti-6Al-4V)and GH4169 are carried out utilizing the self-inhaling internal cooling wheel.The experimental results show that the self-inhaling internal cooling wheel can efficiently reduce the grinding surface temperature.Moreover,the inherent mechanism of reducing the grinding temperature using the internal cooling method is revealed.Meanwhile,under the same grinding conditions,the grinding ratio during the experiments on GH4169 using self-inhaling internal cooling method is about 3 times as high as using conventional external cooling method.And the grinding forces can be reduced by about 20%.This research revealed the inherent mechanism of higher grinding temperature in the process of vertical sculptured grinding using the cup wheel,which provides theoretical basis for the design and application of self-inhaling internal cooling wheel.At the same time,an efficient and non-invasive surface grinding method of TC4 and GH4169 is presented.

New generation thermo-mechanical control process(TMCP) based on ultra-fast cooling is being widely adopted in plate mill to product high-performance steel material at low cost. Ultra-fast cooling system is complex because of optimizing the temperature control error generated by heat transfer mathematical model and process parameters. In order to simplify the system and improve the temperature control precision in ultra-fast cooling process, several existing models of case-based reasoning(CBR) model are reviewed. Combining with ultra-fast cooling process, a developed R5 CBR model is proposed, which mainly improves the case representation, similarity relation and retrieval module. Certainty factor is defined in semantics memory unit of plate case which provides not only internal data reliability but also product performance reliability. Similarity relation is improved by defined power index similarity membership function. Retrieval process is simplified and retrieval efficiency is improved apparently by windmill retrieval algorithm. The proposed CBR model is used for predicting the case of cooling strategy and its capability is superior to traditional process model. In order to perform comprehensive investigations on ultra-fast cooling process, different steel plates are considered for the experiment. The validation experiment and industrial production of proposed CBR model are carried out, which demonstrated that finish cooling temperature(FCT) error is controlled within ±25 ℃ and quality rate of product is more than 97%. The proposed CBR model can simplify ultra-fast cooling system and give quality performance for steel product.