Deform Analysis on Fixture for Peripheral Grinding of Indexable Inserts

在高速精密磨削可转位刀片周边时,由于采用双顶尖油压夹紧刀片,再通过在刀片上产生的摩擦力和油压力来约束刀片的6个运动自由度,造成夹具结构刚性相对薄弱。为此,针对极限夹紧工况时夹具的受力变形进行了分析,通过结构改进与误差补偿,提高了夹具定位精度和磨削加工的可靠性。In high speed precision grinding the peripheral of indexable inserts,due to the double chucks clamping the blade by the oil pressure,and through the friction and the oil pressure produced in the blade to restrain the insert'six movement degrees,all these w ill make the fixture structure rigid become relatively w eak.Therefore,the paper analyses the fixture deformation in the limit w orking condition,and improves the accuracy of the fixture location and the reliability of the grinding process through the structure improvement and error compesation.国家国家科技重大专项(2010ZX04001-162

Structure Analysis and Optimization for 5-axis CNC Grinder Bed

在AnSyS软件平台上建立五轴数控磨床有限元模型,对其床身结构进行静、动态特性分析与优化,通过对比提出两种优化方案,分析结果表明:综合改进后的床身相比原床身在静态特性上得到极大提高,且动态特性也有相应的增强。Finite element model of 5-axis CNC grinder bed was built on ANSYS software platform.The two optimal schemes for the bed structure were extracted on the basis of static and dynamic analyses and optimization.Comprehensive analysis shows that the static performance of the improved bed has been greatly enhanced and the dynamic performance has been correspondingly strengthened than original bed.国家科技重大专项资助项目(2010ZX04001-162

Research on Virtual Five-axis CNC Tool Grinder Machining Simulation Technology

通过计算机辅助设计与虚拟样机技术,建立了五轴数控工具磨床虚拟加工环境。借助这个平台对回转面刀具进行了设计制造的前期验证,检验加工指令的准确与否。最后以两刃立铣刀为例,利用生成的数控加工程序对其进行了虚拟仿真磨削,结果证明了研究理论的可行性和准确性。同时,加工仿真可有效判断机床工艺系统的相互干涉问题,提高了数控指令的可靠性。The design process of a virtual machining environment for five-axis CNC tool grinder based on the research of the computer aided design and virtual prototype technology has been presented in this paper.This simulation platform is very adapt to the early verification of helical cutter design and manufacturing.And the correctness of NC processing commands can also checked on this simulation platform.Taking the end mill as an example,the manufacturing process was simulated.The simulation results show that the virtual modeling method is feasible and the result can effectively judge the mutual interference of machine tool system.This method also can improve the reliability of NC commands.国家科技重大专项资助项目(2010ZX04001-162

Research on Virtual Inspection and Grinding Simulation Technology of Five-axis CNC Tool Grinder

给出了可转位刀片在线测量的数学模型,建立了五轴数控工具磨床虚拟检测及虚拟磨削环境,对可转位刀片磨削前和磨削后的测量过程进行了虚拟仿真。最后以带修光刃正方形刀片为例,借助虚拟检测和磨削仿真技术对其进行生产制造的前期验证工作,检验了自动生成数控加工程序的正确性,同时完成了机床干涉判断。整个研究对测量规划可行性及数控程序可靠性的评估分析有较高的参考意义。The mathematical model of on-line inspection of indexable inserts is given.This paper established a virtual inspection environment and a virtual machining environment for five-axis CNC tool grinder,and conducted the inspection simulation of the indexable inserts.Taking the squre inserts as an example,this virtual inspection technology and grinding simulation technology is very adapt to the early verification of manufacturing.The correc-tness of NC processing commands can be checked and the result can judged the mutual interference of machine tool.The research provides highly reference significance for estimating ang analyzing the feasibility of measurement and the reliability of NC commands.国家科技重大专项(2010ZX04001-162

Taxonomía y morfología de la yuca

恢复沉水植物是受污染水体生态修复与重建的有效措施之一,人工快速大面积恢复沉水植物的方法是关键。选取杭州西湖西进区域茅家埠和浴鹄湾近岸水域,分别采用扦插法、沉栽法和播种法对沉水植物菹草、苦草和黑藻进行种植。研究表明:运用沉栽法种植的菹草存活率比用播种法种植的存活率高71.1%;运用扦插法种植的苦草比沉栽法和播种法的存活率分别高84.3%和87.8%;运用扦插法种植的黑藻比用播种法种植的存活率高69%;3种种植方式下最终的单株植物生物量间无显著差异

Structural analysis and lightweight study for the five-axis grinder bed

以五轴联动工具磨床的床身为研究对象,分析了磨床在极限位置使用情况下床身的静态特性,找到了床身变形最大区域。通过自由模态分析和约束模态分析,得到床身各阶模态的振动特点,并从最大变形区域中选取一点进行谐响应分析,预测床身的持续动力特性。根据分析结果,找出薄弱环节,在保证床身动静态特性不降低的基础上对床身进行轻量化研究,最终减重7.73%,节省了材料与成本。With the five-axis grinding machine tool bed as the research object, the maximum deformation region can be found after analyzing the static characteristics in the use of the grinder limit positions.Through free modal and constraint modal analysis, the vibration characteristics of each order of the bed can be seen and a point in the maximum deformation region is selected to carry out the harmonic response analysis to predict the sustainable dynamic characteristic.According to the results of analysis, find out the weak areas in the bed and conduct the lightweight optimization on the condition of no reduction of static and dynamic characteristic of the bed.And finally, it reduces 7.73% of materials and prime costs.数控国家科技重大专项(2010ZX04001-162

海绵状生物质基阴离子交换纤维制备与吸附性能研究

以生物质海绵-丝瓜络纤维为原料,以吡啶为催化剂,二甲胺作为引入基团对其进行接枝共聚,制备海绵状生物质基阴离子交换纤维。根据产品对溶液中硝酸根的去除效果,探讨了最佳制备工艺,以及产品投加量、pH值、反应时间等因素对NO3-去除率的影响。结果表明,环氧氯丙烷用量、催化反应温度和催化时间为影响产品吸附性能的主要因素;对于250mg/L的硝酸根溶液,静态吸附1h,投加量为0.1g时,产品对硝酸根离子的吸附量达到112.26mg/g

海绵状生物质基阴离子交换纤维制备与吸附性能研究

以生物质海绵-丝瓜络纤维为原料,以吡啶为催化剂,二甲胺作为引入基团对其进行接枝共聚,制备海绵状生物质基阴离子交换纤维。根据产品对溶液中硝酸根的去除效果,探讨了最佳制备工艺,以及产品投加量、pH值、反应时间等因素对NO3-去除率的影响。结果表明,环氧氯丙烷用量、催化反应温度和催化时间为影响产品吸附性能的主要因素;对于250mg/L的硝酸根溶液,静态吸附1h,投加量为0.1g时,产品对硝酸根离子的吸附量达到112.26mg/g

高吸水性树脂研究进展

分析了高吸水性树脂的吸水机理,总结了各类树脂的特点和不足,揭示了其应用领域和发展趋势。最后,结合国内外高吸水性树脂的研究状况,建议了高吸水性树脂的研究和发展方向