上传用户：ajnwdlcpzk文档下载 ：『』&&『』『』学位专业：&关 键 词 ：&&&&&权力声明：若本站收录的文献无意侵犯了您的著作版权，请点击。摘要:（摘要内容经过系统自动伪原创处理以避免复制，下载原文正常，内容请直接查看目录。）激光强化技巧可年夜幅进步模具外面的硬度、耐磨性和耐腐化性，改良模具应用机能和晋升应用寿命，但另外一方面其高硬度自在曲面面形的庞杂性、局域强化带来的硬度差别却制约了后续外面周详加工的展开。鉴于模具外面激光强化处置具有优越的运用远景，处理其光整加工的技巧困难关于激光强化技巧在模具范畴的运用具有主要的实际意义。针对上述成绩，本文提出了一种基于软凝结磨粒气压砂轮的光整办法。为了晋升高压情况下砂轮橡胶基体的抗扯破特征，提出采取添加短纤维加强砂轮基体的办法，给出了复合资料模量与强度猜测模子；对气压砂轮的力学特征停止了剖析，并经由过程仿真停止了验证；采取团圆元剖析办法对软凝结形状下的磨粒静态特征停止了研讨；最初对软凝结磨粒气压砂轮的资料去除特征停止了剖析，并经由过程实验停止了验证。本文详细内容以下：(1)针对复合资料中纤维的无序散布特征，树立了多维网状散布模子，提出采取取向因子对其纤维散布特征停止全体归一化，对Halpin一Tsai方程停止了修改，并树立了复合资料的模量猜测模子和强度猜测模子，完成了芳纶浆粕纤维对丁苯橡胶的加强，制备了分歧纤维体积分数和分歧尺寸的气压砂轮半球形加强橡胶基体。经由过程拉伸实验对上述实际模子停止了验证，得出经由过程增长纤维所占体积分数或应用低模量的橡胶基质，纤维在橡胶基体中的机能越接近单一性，猜测模子将加倍精确。上述成绩的评论辩论将为气压砂轮后续各项机能剖析奠基基本。(2)树立了气压砂轮橡胶基体接触力学模子，对接触进程停止了数值模仿，得出结论：气压砂轮外面接触应力跟着纤维体积分数的增长而增长，异样也跟着原橡胶基体弹性模量的增长而增长，但砂轮接触应变却随之削减：联合层间弹性力学系统实际，剖析了气压砂轮静态变更下的载荷感化纪律，树立了气压砂轮双层弹性力学模子；分离以复合橡胶层厚度和磨粒粘结层厚度为研讨对象停止了仿真，发明低橡胶层厚度有益于晋升气压砂轮的自锐性，合适于年夜曲率外面加工；高橡胶层厚度则有益于晋升砂轮接触应力，进步光整效力。以上阐述剖析了气压砂轮基体的力学特征，并为后续气压砂轮的制备工艺参数供给了根据。(3)采取团圆元剖析办法，树立了软凝结磨粒颗粒间的法向与切向接触模子，剖析了磨粒群的蠕变效应，给出了颗粒微不雅平动与迁移转变位移公式：经由过程对密集颗粒体系的数值模仿，论述了蠕变景象的产生进程，并剖析了软凝结磨粒群和游离磨粒群的接触力网，证明了前者发生的外面接触应力将明显年夜于后者的接触应力；论述了软凝结磨粒群气压砂轮的高压接触成型制造工艺流程和评价尺度，给出了可用于分歧加工情况下的磨粒与粘结剂详细配比喻案。上述剖析描写了软凝结磨粒群的微不雅感化机理，为后续气压砂轮终究资料去除模子的树立供给了根据。(4)树立了气压砂轮表层单颗磨粒的力学模子，得出磨粒群微不雅感化机理与气压砂轮资料去除特征之间的接洽。联合拉宾诺维奇磨损道理，对Preston方程系数停止修改，并对磨粒群在柔性支持情况下的应力盘算停止修改，给出了表层磨粒群在静态变更下的速度盘算公式，终究树立了实用于软凝结磨粒气压砂轮的资料去除预估模子，并经由过程实验停止了验证，得出软凝结磨粒较游离磨粒有着更高的资料去除才能，而较固着磨粒群则可防止曲面加工时过深的划痕。Abstract:Laser strengthening technique of painting of the eve of the progressive die outside of the hardness, wear resistance and corrosion resistance, improved mold application function and promotion application of life, but on the other hand, the high hardness free surface shape is numerous and jumbled, local strengthening hardness difference has restricted the follow-up outside careful processing. In view of the advantages of laser strengthening and disposal of die and mould, it is of great practical significance to deal with the difficulties in the application of laser hardening technology in the field of mould. In view of these problems, this paper presents a method based on the soft condensation of abrasive wheel of the light. In order to enhance the pressure under the wheel rubber matrix of tearing feature is proposed by adding short fiber to strengthen the means of the grinding wheel matrix, gives the composite modulus and stren the mechanical characteristics of pneumatic wheel are analyzed, and through the process of simulation to s take reunion element analysis method for soft condensed shape grinding particle static charac originally of soft condensed grinding grain pressure grinding wheel material removal characteristics analysis and through experimental test. This paper with the following: (1) for fiber composite materials in irregularly scattered characteristics, and establish a multi-dimensional network distribution model, put forward the orientation factor of the fiber dispersion characteristics of all normalized, the Halpin Tsai equation stop modified and set the modulus of the composite data speculation molds and strength prediction model, completed the Kevlar pulp for styrene butadiene rubber (SBR) strengthen prepared different fiber volume fraction and size differences of pneumatic wheel hemisphere shaped reinforcing rubber matrix. Through the process of tensile test, the actual model was verified, and the results show that the volume fraction of the fiber and the matrix of the rubber matrix, the function of the fiber in the rubber matrix is more close to the single, and the model will be more accurate. The comments of these results will be the basis for the analysis of the function of the pneumatic grinding wheel. (2) establish a pneumatic wheel rubber matrix contact mechanics model, the numerical simulation on the contact process, draw the conclusion: the contact stress along the fiber volume fraction of pneumatic wheel outside growth and growth, also follow the original rubber elastic modulus increases, but the wheel contact strain is reduced between the actual joint layer: the elastic mechanics system, analyzes the influence of static load pressure changes under the discipline of grinding wheel, grinding wheel set pressure double ela separation using composite rubber layer thickness and abrasive adhesive layer thickness as the research object and the simulation, the invention of the rubber layer thickness is beneficial to the promotion of low pressure wheel self dressing, suitable for the nocturne rat high rubber layer thickness is beneficial to the promotion of the wheel contact stress, the progress of finishing effect. This paper analyzes the mechanical characteristics of the grinding wheel matrix, and provides a base for the preparation of the following pressure grinding wheel. (3 yuan) to reunion analysis, set up the soft abrasive particle condensation between normal and tangential contact model, analyzes the grinding creep effect of particle group, given the micro particle translational and transition displacement formula: numerical imitation of dense granular system process, the production process of creep the scene, and analyzes the soft condensation particle group and free abrasive group contact force network, proved the outside contact stress will be significantly greater than the l discusses the soft contact pressure condensation forming grinding particle pressure wheel manufacturing process and evaluation scale, are given. For abrasive and binder with different processing conditions with the case of metaphor. The above analysis describes the micro mechanism of the soft condensation of the abrasive particles, which provides a base for the subsequent pressure grinding wheel. (4) the mechanical model of the single grain of the surface of the pressure wheel is established, and the mechanism of the action of the micro mechanism of the abrasive particles and the characteristics of the material removal of the pneumatic grinding wheel is obtained. United rabinovitch wear reason, of Preston equation coefficient stop modification, and the wear particle swarm in flexible support should force calculation stop modification, gives the surface grinding particle swarm in the dynamic changes of speed calculation formula, eventually establish a practical soft condensation grinding grain pressure grinding wheel material removal estimate model, and through experimental test, that the soft condensed abrasive than the free abrasive has a higher removal can, and a fixed abrasive particle swarm can prevent surface machining deep scratches.目录:摘要5-7ABSTRACT7-8目录9-11第一章 绪论11-28&&&&1.1 课题的来源11&&&&1.2 论文研究背景及研究意义11-14&&&&1.3 模具的激光表面强化方法14-15&&&&1.4 模具加工方法的研究现状15-20&&&&&&&&1.4.1 磨削加工技术15-16&&&&&&&&1.4.2 研磨加工技术16-17&&&&&&&&1.4.3 抛光加工技术17-20&&&&1.5 软固结气压砂轮抛光技术的基础理论20-25&&&&&&&&1.5.1 短纤维增强复合材料性能分析20-22&&&&&&&&1.5.2 弹性力学体系分析22-23&&&&&&&&1.5.3 密集颗粒系统及材料去除理论模型23-25&&&&1.6 论文主要研究内容25-28第二章 气压砂轮短纤维增强橡胶基体的特性分析28-54&&&&2.1 引言28&&&&2.2 气压砂轮橡胶基体的短纤维增强理论28-34&&&&&&&&2.2.1 短纤维的分布特性28-29&&&&&&&&2.2.2 短纤维增强复合材料的模量预测模型29-31&&&&&&&&2.2.3 复合材料的强度计算31-34&&&&2.3 短纤维增强气压砂轮橡胶基体的实验分析34-52&&&&&&&&2.3.1 短纤维增强砂轮基体的制备实验34-37&&&&&&&&2.3.2 短纤维的分布特性37-40&&&&&&&&2.3.3 短纤维增强复合材料的强度试验40-47&&&&&&&&2.3.4 短纤维增强复合材料的模量计算47-52&&&&2.4 本章小结52-54第三章 气压砂轮的力学分析及仿真54-72&&&&3.1 引言54&&&&3.2 短纤维增强复合基体的数值模拟54-59&&&&&&&&3.2.1 接触应变仿真分析55-57&&&&&&&&3.2.2 接触力仿真分析57-59&&&&3.3 气压砂轮的力学分析方法59-66&&&&&&&&3.3.1 气压砂轮加工的设计方法59-61&&&&&&&&3.3.2 动态分析方法61-63&&&&&&&&3.3.3 层间弹性力学体系分析方法63-66&&&&3.4 双层弹性力学模型的仿真分析66-71&&&&&&&&3.4.1 双弹性层的接触应变66-68&&&&&&&&3.4.2 不等厚弹性层的应力分析68-71&&&&3.5 本章小结71-72第四章 软固结磨粒群的力学分析与气压砂轮制作研究72-88&&&&4.1 引言72&&&&4.2 软固结磨粒群的特性分析72-74&&&&4.3 密集颗粒系统的特性分析74-81&&&&&&&&4.3.1 软固结磨粒群的力学行为74-76&&&&&&&&4.3.2 磨粒群的蠕变效应76-77&&&&&&&&4.3.3 软固结磨粒群的数值模拟77-81&&&&4.4 软固结磨粒群气压砂轮的制作工艺81-87&&&&&&&&4.4.1 软固结磨粒气压砂轮的工艺评价标准81-82&&&&&&&&4.4.2 软固结磨粒气压砂轮的制作方法82-83&&&&&&&&4.4.3 粘结剂的选用依据83-87&&&&4.5 本章小结87-88第五章 软固结磨粒气压砂轮材料去除特性与试验研究88-107&&&&5.1 引言88&&&&5.2 软固结磨粒气压砂轮的材料去除模型88-94&&&&&&&&5.2.1 Preston修正系数K_p的建立88-89&&&&&&&&5.2.2 单颗磨粒切削力学模型89-91&&&&&&&&5.2.3 磨粒软固结形态下的应力修正91-92&&&&&&&&5.2.4 速度分布特性92-94&&&&5.3 针对材料去除模型的试验分析94-98&&&&&&&&5.3.1 软固结磨粒气压砂轮的加工平台94&&&&&&&&5.3.2 硬度影响系数K_2的分析94-95&&&&&&&&5.3.3 磨粒粒度的影响95-96&&&&&&&&5.3.4 压力P对材料去除率的影响96-98&&&&5.4 软固结磨粒气压砂轮的加工试验98-106&&&&&&&&5.4.1 软固结磨粒群的加工试验和结果分析98-100&&&&&&&&5.4.2 应力分布特性引起的加工表面差异100-102&&&&&&&&5.4.3 软固结磨粒群与其它形态磨粒的加工对比102-106&&&&5.5 本章小结106-107第六章 结论与展望107-110&&&&6.1 论文的主要研究内容和贡献107-108&&&&6.2 未来工作展望108-110参考文献110-118致谢118-120攻读学位期间参加的科研项目和成果120-121分享到：相关文献|您是不是在找：
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模具类文章280篇，页次：1/2页 【‖ 上一页 ‖ ‖】 直接转到&&
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