At the China International Food Packing Machinery Exhibition, the new model die set for PET plastic jet-mouldingmachine developed by the Zhejiang Province Taizhou Municipality Huangyan Sanyou Plastics Factory attracte...At the China International Food Packing Machinery Exhibition, the new model die set for PET plastic jet-mouldingmachine developed by the Zhejiang Province Taizhou Municipality Huangyan Sanyou Plastics Factory attracted the attention of numerous domestic and foreign clients. They rushed to the stand in great numbers for consultation and talks on ordering. According to the evaluation of the experts concerned, the die set is the most advanced one nationwide for PET plastic jet-moulding machinery.展开更多
The rapid development of aviation and aerospace technologies has led to increased interest in the application of numerically controlled(NC) technology for bending light-weight titanium alloy tubes.In order to study an...The rapid development of aviation and aerospace technologies has led to increased interest in the application of numerically controlled(NC) technology for bending light-weight titanium alloy tubes.In order to study and develop advanced NC bending technology,it is necessary to understand the bending performance of medium strength TA18(Ti-3Al-2.5V,ASTM Gr.9) titanium alloy tubes during NC bending under different die sets.This paper focuses on the bending performance of medium strength TA18 tubes under different NC bending die sets,including the variations in the stress,strain,wall thickness,cross sectional deformation,and defects.The results show that adding a wiper die to the base die set decreases the radial,hoop,and tangential compressive stress and the tangential compressive strain,and adding a mandrel to the base die set also decreases these stresses,but increases the radial and hoop tensile stress and decreases the hoop compressive strain obviously,and brings about a three-dimensional tensile stress concentration where the mandrel provides support.For the NC bending of medium strength TA18 tubes,the flattening of cross section is more sensitive index than the thinning of wall thickness.Introducing a mandrel can improve the flattening of cross section obviously but it has a little worse effect on the thinning of wall thickness,and adding a wiper die to the base die set can inhibit the occurrence of the inside bulge but worsen the flattening of the cross section remarkably.Considering the above effects of the mandrel and wiper die on bending performance,it is reasonable to apply the die set comprising a bending die,clamp die,and pressure die for tubes with a small diameter and the die set including an appropriate mandrel additionally for tubes with a larger diameter,in order to bend the medium strength TA18 tubes with high quality and at low cost.展开更多
In this paper,by using the conceptions of the normal equidistant line and the cen-tripetal equidistant line of a plane curve and their equations which were presented inReferences [1] and [2] respectively,the authors s...In this paper,by using the conceptions of the normal equidistant line and the cen-tripetal equidistant line of a plane curve and their equations which were presented inReferences [1] and [2] respectively,the authors simplify the research on the cam forcamber-grinding the stator of a paddle pump which was discussed in Reference [3],and makes it more precise.In addition,they also introduce a correspondingmathematical model of the precision dressing mechanism of die sets.展开更多
通过分析多工位级进模模架设计需求并结合UG软件装配环境及装配机制,提出了多工位级进模基于层次结构的约束装配模型,并给出了装配模型的计算机描述;利用UG OPEN/UIstyler、UGOPEN/Menuscript、UG OPEN API等工具,结合VisualC++编程软...通过分析多工位级进模模架设计需求并结合UG软件装配环境及装配机制,提出了多工位级进模基于层次结构的约束装配模型,并给出了装配模型的计算机描述;利用UG OPEN/UIstyler、UGOPEN/Menuscript、UG OPEN API等工具,结合VisualC++编程软件开发了多工位级进模模架设计模块,实现了UG环境下级进模模架的调用、修改、储存,为级进模结构标准件库功能的实现及工作零件设计模块的开发奠定了基础。展开更多
文摘At the China International Food Packing Machinery Exhibition, the new model die set for PET plastic jet-mouldingmachine developed by the Zhejiang Province Taizhou Municipality Huangyan Sanyou Plastics Factory attracted the attention of numerous domestic and foreign clients. They rushed to the stand in great numbers for consultation and talks on ordering. According to the evaluation of the experts concerned, the die set is the most advanced one nationwide for PET plastic jet-moulding machinery.
基金supported by the Program for New Century Excellent Talents in University of China (NCET-08-0462)the Fund of the State Key Laboratory of Solidification Processing in NWPU (Grant No. KP200919)the 111 Project of China (B08040)
文摘The rapid development of aviation and aerospace technologies has led to increased interest in the application of numerically controlled(NC) technology for bending light-weight titanium alloy tubes.In order to study and develop advanced NC bending technology,it is necessary to understand the bending performance of medium strength TA18(Ti-3Al-2.5V,ASTM Gr.9) titanium alloy tubes during NC bending under different die sets.This paper focuses on the bending performance of medium strength TA18 tubes under different NC bending die sets,including the variations in the stress,strain,wall thickness,cross sectional deformation,and defects.The results show that adding a wiper die to the base die set decreases the radial,hoop,and tangential compressive stress and the tangential compressive strain,and adding a mandrel to the base die set also decreases these stresses,but increases the radial and hoop tensile stress and decreases the hoop compressive strain obviously,and brings about a three-dimensional tensile stress concentration where the mandrel provides support.For the NC bending of medium strength TA18 tubes,the flattening of cross section is more sensitive index than the thinning of wall thickness.Introducing a mandrel can improve the flattening of cross section obviously but it has a little worse effect on the thinning of wall thickness,and adding a wiper die to the base die set can inhibit the occurrence of the inside bulge but worsen the flattening of the cross section remarkably.Considering the above effects of the mandrel and wiper die on bending performance,it is reasonable to apply the die set comprising a bending die,clamp die,and pressure die for tubes with a small diameter and the die set including an appropriate mandrel additionally for tubes with a larger diameter,in order to bend the medium strength TA18 tubes with high quality and at low cost.
文摘In this paper,by using the conceptions of the normal equidistant line and the cen-tripetal equidistant line of a plane curve and their equations which were presented inReferences [1] and [2] respectively,the authors simplify the research on the cam forcamber-grinding the stator of a paddle pump which was discussed in Reference [3],and makes it more precise.In addition,they also introduce a correspondingmathematical model of the precision dressing mechanism of die sets.
文摘通过分析多工位级进模模架设计需求并结合UG软件装配环境及装配机制,提出了多工位级进模基于层次结构的约束装配模型,并给出了装配模型的计算机描述;利用UG OPEN/UIstyler、UGOPEN/Menuscript、UG OPEN API等工具,结合VisualC++编程软件开发了多工位级进模模架设计模块,实现了UG环境下级进模模架的调用、修改、储存,为级进模结构标准件库功能的实现及工作零件设计模块的开发奠定了基础。
