【作者】 潘承怡；

【导师】 马岩； 任洪娥；

【作者基本信息】 东北林业大学 ， 机械设计及理论， 2008， 博士

【摘要】 随着社会的快速发展,人们对高档汽车的消费需求不断增多,尤其是高档汽车的实木内饰受到人们的普遍欢迎,如利用实木生产的仪表板、换档杆手柄、车门把手、方向盘等,但由于原料的缺乏和加工技术等因素导致具有高档实木内饰的高档汽车很难走进现今工薪收入家庭。本文提出的车用微米木纤维模压制品是高档汽车实木内饰零件的有效替代品,将解决高档木制品零件在原料、成型技术和成本等方面的问题,将促进木材在汽车行业的发展,提高我国人民对高档汽车的消费水平。首先,研究了车用微米木纤维模压制品加工设备的设计理论,分析了其功能和制定了总体设计方案,研究了设备的组成系统,进行了结构和强度设计,开发了车用微米木纤维模压制品加工设备实验台,该实验台设计结构简单合理、成型速度快,为生产实践提供了一种新的模压加工车用微米木纤维制品的实验设备。利用该实验台进行了大量实验,制备了车用微米木纤维模压制品实验样品,探索出模压成型的工艺方法和工艺路线,获得了关键工艺参数,取得了工业化生产的第一手资料。在对模压设备和模压工艺研究的同时,也对车用微米木纤维模压制品的螺纹强度与纹理走向问题进行了研究,根据实验结果提出了握钉力性能与模压密度的相关方程,给出了模压加压曲线。以上研究形成了车用微米木纤维模压制品成型理论。其次,提出了针对模压过程参数和复合材料力学的握钉力计算方法和螺钉连接强度设计理论。建立了车用微米木纤维模压制品螺纹的力学模型,推导了螺纹牙载荷分布曲线和强度计算公式,精确计算了各螺纹牙受力的百分比,提出了微米木纤维模压制品握钉力计算公式,编写了握钉力计算机程序,利用计算机可快速获得握钉力。通过实验验证了车用微米木纤维模压制品强度超过同材质实木制品,证明了车用微米木纤维模压制品零部件的设计是成功的。还详细分析了微米木纤维模压制品螺纹的受力、变形、几何参数之间的关系,求导了载荷分布系数,建立了微米木纤维模压制品握钉结合部的载荷分布方程。并研究了微米木纤维模压制品螺钉组连接强度可靠性优化设计方法。最后,分析了微米木纤维模压制品成型工艺中存在的问题和解决方法,并通过实验验证了微米木纤维模压制品握钉力计算公式,分析了理论计算值与实验结果的误差及其产生原因。本文研究的车用微米木纤维模压制品成型理论,提供了模压设备和成型工艺,将微米木纤维基础理论应用于汽车行业;本文研究的握钉力计算方法,在木材学与机械学交叉学科进行了深入的研究,利用计算机可快速计算各种规格螺钉的握钉力,将改变木材握钉力性能仅依靠试验测定的现状,显著提高工作效率。更多还原

【Abstract】 With the fast development of society,demand for luxurious car increases gradually. Wooden decorations in luxurious car,such as wooden panel,joy stick,doorknob,steering wheel and so on,are more and more popular.But lack of raw materials and complicated processing technology made wooden decorations very expensive.Ordinarily families and consumers can’t afford to it.The micron wood fiber molded products proposed by this dissertation are workable replacements of wood parts in luxurious cars.It will solve the problems of material shortage,molding technology,and high cost.It will enhance the usage of wooden products in car industry and improve the consumption of luxurious car.Firstly,the dissertation studied the design theory of equipment processing micron wood fiber molded products for cars,analyzed the function,worked out an overall design plan, studied component system of the equipment,designed the structure and strength,and developed the experimental equipment of micron wood fiber molded products for cars.The designed structure of the experimental equipment is simple and rational.The speed of molding is high.It provided people a new experimental equipment of molding micron wood fiber products.With the equipment,plenty of experiments had been done and many samples of micron wood fiber molded products for cars were produced.We’ve got the molding technological method,route,key technological parameters and firsthand data for industrialized production.Meanwhile we studied the thread strength and control of veins tending of micron wood fiber molded products for ears.According to the experimental results,the correlative equation of screw holding capability and molding density is put forward,and the molding press curve is given.The study above forms the molding theory of micron wood fiber molded products for cars.Secondly,the method of calculating screw holding capability and the strength design of screw joints of micron wood fiber molded products according to molding process parameters and compound material mechanics were put forward.The mechanical model of screw thread of micron wood fiber molded products for cars was established.The load distributing curve and strength calculating equations of screw thread were deduced.The precise percentage of force in the threads was calculated.The equation of calculating screw holding capability of micron wood fiber molded produts was proposed.The computer program was edited so that the screw holding capability can be obtain rapidly.Experiments has validated that the strength of micron wood fiber molded products is higher than the products made of the same materials of natural woods.The design of micron wood fiber molded parts was proved to be successful.Further more,the relationship of forces,deformation of threads and the geometrical parameters of micron wood fiber molded products were analyzed in detail.The load distributing coefficient was deduced.The load distributing equation of the screw holding binding site of micron wood fiber molded products was established.Besides,the optimal design of strength of screw joints for micron wood fiber molded products with reliability was put forward.Thirdly,the questions and solutions of molding process of micron wood fiber molded products were analyzed.The calculating equations of screw holding capability of micron wood fiber molded products were proved by test.The error and reasons of the results of theory and test were analyzed too.The molding theory of micron wood fiber molded products for cars studied by this dissertation offered the molding equipment and technology.It applied the fundamental theory of micron wood fiber to car industry.The calculating method of screw holding capability of this dissertation is deep study of intersecting subjects of wood science and mechanics.Using computer,we can calculate the screw holding capability of various screw rapidly.The state that the screw holding capability of wood depends on experiments only will be changed.It will raise the working efficiency greatly.更多还原