共查询到19条相似文献,搜索用时 62 毫秒
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批量加工有位置精度要求的平行小孔系的工艺难点及对策山东沂源国营945厂(256100)李睿1引言在生产实际中常常会遇到一些有位置精度要求的平行小孔系(直径D≤5mm)的批量加工问题。图1为我厂生产的DY100磁电极轴套筒图,其上有用于与超越离合器配合... 相似文献
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箱体类零件是机械设备中最基础的组成部分,由它将机械部件中的的轴、轴承套、齿轮、轴承等有关零件按照一定的关系组装在一起而形成一个整体机床中的主轴箱体类零件是精度要求最高的一类箱体零件,数控卧式旋压机的主轴箱就属于这一类。本单位在数控卧式旋压机的主轴箱加工中使用捷克落地卧式镗铣床加工数控卧式旋压机的主轴箱体孔系,并以主孔系加工为例,介绍主轴箱孔系加工方法。通过边加工边测量的加工方法,调整支撑,测量镗床主轴挠度变化规律,确定主轴与支撑点之间的位置,对箱体孔系进行一次预加工。预加工后,测量其尺寸误差并分析原因,做调整后,最终加工出了满足图纸精度要求的主轴箱体孔系。通过分析该大型铸件箱体的加工难点及加工方法,并结合现有设备特点,对加工方法进行调整,实现了使用通用设备加工大型高精度零件的过程,解决了实际生产中遇到的问题,提高了生产效率,对此类零件的加工具有指导意义,具有实际工程意义。 相似文献
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唐浩 《机械工人(冷加工)》2007,(7):59-59,72
机械加工制造当中经常遇到壳体、箱体、机身和肘杆之类的零件,这类零件通常都有许多具有相互位置精度的精密圆柱孔组成孔系。对于一些大型的零件,由于受到加工设备的限制,往往无法简单依靠加工机床本身的定位精度来保证零件的孔距公差,我们就采用了相对测量法来保证孔系加工精度。 相似文献
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重点阐述了箱体加工过程中,孔系形状和位置误差产生的各种因素和形式,提出降低和减少误差的办法,并对影响传动特性和精度的因素作了进一步的简述,目的在于为机加、检验、装配人员提供判定误差及误差影响程度的参考依据. 相似文献
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分析典型多孔冲模主要零件的加工工艺特点 ,对直接利用凸模加工凹模的电火花加工工艺方法进行了实验研究 ,提出了冲裁间隙的保证方法 相似文献
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平面尺寸链求解的区间数法 总被引:2,自引:0,他引:2
提出了一种利用区间教求解平面尺寸链的新方法,具有计算简便、可靠性高、适用性强的优点,适用于平面尺寸链中工序尺寸链的计算及工程设计中标注尺寸链. 相似文献
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Jinghua XU Hongsheng SHENG Shuyou ZHANG Jianrong TAN Jinlian DENG 《Frontiers of Mechanical Engineering》2021,16(1):133-150
Surface accuracy directly affects the surface quality and performance of mechanical parts. Circular hole, especially spatial non-planar hole set is the typical feature and working surface of mechanical parts. Compared with traditional machining methods, additive manufacturing (AM) technology can decrease the surface accuracy errors of circular holes during fabrication. However, an accuracy error may still exist on the surface of circular holes fabricated by AM due to the influence of staircase effect. This study proposes a surface accuracy optimization approach for mechanical parts with multiple circular holes for AM based on triangular fuzzy number (TFN). First, the feature lines on the manifold mesh are extracted using the dihedral angle method and normal tensor voting to detect the circular holes. Second, the optimal AM part build orientation is determined using the genetic algorithm to optimize the surface accuracy of the circular holes by minimizing the weighted volumetric error of the part. Third, the corresponding weights of the circular holes are calculated with the TFN analytic hierarchy process in accordance with the surface accuracy requirements. Lastly, an improved adaptive slicing algorithm is utilized to reduce the entire build time while maintaining the forming surface accuracy of the circular holes using digital twins via virtual printing. The effectiveness of the proposed approach is experimentally validated using two mechanical models. 相似文献
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以铝合金薄壁零件数控加工夹具使用为例,介绍了薄壁零件在数控机床铣削加工过程中的装夹方法.在实际生产过程中,对夹具进行了优化改良,有效减少了工件的装夹时间和定位时间,提高了加工效率和加工精度.满足了月产20万件的批量生产要求,使产品的工艺性、经济性得到显著提高. 相似文献
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A new forward kinematics algorithm for the mechanism of 3-RPS (R: Revolute; P: Prismatic; S: Spherical) parallel manipulators is proposed in this study. This algorithm is primarily based on the special geometric conditions of the 3-RPS parallel mechanism, and it eliminates the errors produced by parasitic motions to improve and ensure accuracy. Specifically, the errors can be less than 10–6. In this method, only the group of solutions that is consistent with the actual situation of the platform is obtained rapidly. This algorithm substantially improves calculation efficiency because the selected initial values are reasonable, and all the formulas in the calculation are analytical. This novel forward kinematics algorithm is well suited for real-time and high-precision control of the 3-RPS parallel mechanism. 相似文献