The evolution of the microstructure and the dimension of as molded parts were studied on the basis of the thermogravimetric analysis of wax based MIM binder. The results show that the binder removal speeds are differe...The evolution of the microstructure and the dimension of as molded parts were studied on the basis of the thermogravimetric analysis of wax based MIM binder. The results show that the binder removal speeds are different in different temperature ranges during binder removal process. The evolution of the microstructure of as molded parts during binder removal process clearly showed the initiation and formation of connected pore structure, which is the removal channel of the binder. The as molded parts almost continuously shrank through binder removal process, except an expansion stage during 320～440 ℃, which is the dissolution expansion effect due to the dissolution of V PW in the polymer melt. [展开更多
On the basis of the comprehensive analysis about the automatic generation of the injection mold parting surface, the parting surface design method which introduces knowledge and case-based reasoning （CBR） into the c...On the basis of the comprehensive analysis about the automatic generation of the injection mold parting surface, the parting surface design method which introduces knowledge and case-based reasoning （CBR） into the computer-aided design is described by combining with the actual characteristic in injection mold design, and the design process of case-based reasoning method is also given. A case library including the information of parting surface is built with the index of main shape features, The automatic design of the mold parting surface is realized combined with the forward-reasoning method and the similarity solution procedure. The rule knowledge library is also founded including the knowledge, principles and experiences for parting surface design. An example is used to show the validity of the method, and the quality and the efficiency of the mold design are improved.展开更多
文摘The evolution of the microstructure and the dimension of as molded parts were studied on the basis of the thermogravimetric analysis of wax based MIM binder. The results show that the binder removal speeds are different in different temperature ranges during binder removal process. The evolution of the microstructure of as molded parts during binder removal process clearly showed the initiation and formation of connected pore structure, which is the removal channel of the binder. The as molded parts almost continuously shrank through binder removal process, except an expansion stage during 320～440 ℃, which is the dissolution expansion effect due to the dissolution of V PW in the polymer melt. [
文摘On the basis of the comprehensive analysis about the automatic generation of the injection mold parting surface, the parting surface design method which introduces knowledge and case-based reasoning （CBR） into the computer-aided design is described by combining with the actual characteristic in injection mold design, and the design process of case-based reasoning method is also given. A case library including the information of parting surface is built with the index of main shape features, The automatic design of the mold parting surface is realized combined with the forward-reasoning method and the similarity solution procedure. The rule knowledge library is also founded including the knowledge, principles and experiences for parting surface design. An example is used to show the validity of the method, and the quality and the efficiency of the mold design are improved.
