加工方法

A numerical control method of 4-axis side milling to generate the ruled surface such as the vane wheel was presented.

最后，通过数控实验验证了该方法的可行性，并结合了径流式叶轮机械轴—径型叶轮抛物面叶片的成型设计计算方法，使设计计算和加工计算更方便，加工效率更高。

The off-axis reflection system composed of four aspheric mirrors was designed, but the system structure was not so simple and the performance can also be improved, besides, manufacture and test for large aspheric mirrors are difficult; and then the spherical Fresnel mirror which is easier to be manufactured and tested was used to replace the aspheric mirror, the spherical Fresnel mirror has low cost of replication, but this design also can\'t be used in projection lens because it was only feasible in narrow wavebands; Furthermore, the design making use of catadioptric projection lens was accomplished, this design is greatly applied in rear projector because it has merits of both refraction and reflection. But it had difficulties in color aberration correction and had complex structure.

设计了四片非球面组成的离轴式反射系统，然而，仅采用非球面设计系统结构不够精简，性能也有待进一步提高，且非球面面形较大时加工和检测都存在一定的困难；继而提出了用球面Fresnel反射镜代替非球面的设计方法，虽然Fresnel反射镜加工和检测更为简单，且复制成本低，但对波长具有选择性；进而，应用折反系统结合的方式设计了离轴式投影镜头，该方法因兼具折射和反射的优点，在大屏幕超薄背投系统的设计中广为应用，缺点是会产生难以校正的色差，且结构复杂。

Through comparing the ultrasonic refining effect with the traditional method for refining the waste silk frison material and studying on the feasibility of ultrasonic and the effect on the physicochemical property of the fiber,the reliable foundation was established that existing technique can be replaced by the ultrasonic method in the refining processes.

通过对超声波在绢纺长吐类原料中精练效果与传统工艺的比较，以及对超声波精练方法的可行性及超声波精练方法加工对纤维机械物理性能影响的研究，得到利用超声波精练代替现有加工工艺的可靠依据。

Based on copper plastic processing features, the metal rolling theory and the practical procedure, the paper presents the design method of the copper bar rolling mill pass system and the calculation methods of the factors. Some key factors, such as the elongation factor and filling metal degree through the pass system at every rolling segment, and some dynamic factors are calculated for small and middle copper bar rolling mills.

根据铜加工塑性加工特性及金属连轧理论，结合生产过程，文章提出了中小直径铜杆连轧机整个孔型系统设计方法和参数计算方法，计算了各轧制道次延伸系数、各道次孔型金属充满度等关键参数，并对连轧机中的动态参数进行了计算。

For five-coordinate NC end milling, the author gives the equation of tilt angle, the optimum algorithm of tilt angle, the analysis of machined errors, the compensative algorithm for cutter axis tilt error, and the formulae of feed length, feed width and cutter axis swing angle.

推导了五坐标端铣数控加工中的后跟角计算公式，提出了后跟角的优化计算方法——刀盘周边7点干涉检验法，分析了各种加工误差，提出了刀轴摆动误差补偿方法——刀具切触点偏置法，给出了走刀步长、切削宽度以及刀轴摆角的计算公式。

The analyzing method of NC code that coincides with the international ISO standards is studied. In terms of programming criterion of FANUC system, the dissertation proposes and realizes the theory of compiling and explaining NC code, verification methods of NC code, and interpolation algorithms of NC instruction in machining simulation process. And the NC cutter location information file is produced to drive NC machining simulation system.

研究了符合ISO 标准的NC 程序的分析处理方法，并具体针对FANUC数控系统的编程规范，研究了NC 程序的编译解释原理，提出了加工过程仿真中NC 程序检验方法，实现了NC 指令的插补离散化算法，生成了NC 坐标信息文件，以此作为驱动NC 加工仿真系统的数据源； 3。

Its basic operation method is a tight mother of the lock that the opens to face afterward, can transpose the angle of the pole of arbitrarily, can process the thread that the different helix rises the Cape, this kind of knife pole has the strength and tenacities to process to slice to pare the dosage exaltation labor rate of production and decline low cost etc. to have the progress towards increasing [10]the knife, improve it is a kind of price less that knife have, yielding results the quicker method.

其基本操作方法是拧开其后面的锁紧螺母，可任意调换蜗杆的角度，可加工不同螺旋升角的螺纹，这种刀杆对增加刀具强度和韧性加工切削用量提高劳动生产率及降低成本等方面有所进步，改进刀具是一种代价较少，收效较快的方法。

The effect of the friction moment of bearings on performance is researched. The forming mechanic and influence factors of the friction moment of ball bearing are analyzed. Suitable clearness and groove radius of ball bearings are obtained by experiment and calculation. The relationship between starting moment of ball bearing and various lubricants is analyzed. The measure for reducing the starting moment of ball bearing is put forward, it is the theory basis and reference for ball bearing design of small power unit system.The system is an unstable system when the 24-station ball pen tip production machine is running because of various interferences. It is too hard to describe the system by linear method, so the nonlinear formulation must be used.

研究了小动力头系统轴承摩擦力矩对运转性能的影响，分析了球轴承摩擦力矩的产生机理及影响因素，采用实验和计算的方法得到了动力头球轴承的合理间隙及球轴承沟曲率半径，分析了各种润滑剂与球轴承启动力矩的关系，并提出了减小轴承启动力矩的措施，为小动力头系统的轴承设计提供了理论依据及实践参考。24工位笔头加工机械在笔头的生产加工过程中，由于受到各种因素的干扰是一个不稳定系统，其稳定性会发生一定变化，而且很难用线性方法表述。

Based on the 3D solid model, the changing trend of spiral angle and pressure angle of pitch cone, the thickness-changing trend of face and pitch cone can be analyzed. In addition, the method of cutting tooth on general NC machining center and the measurement of tooth flank geometry on 3D CMM are conducted.

根据锥齿轮切齿仿真所获得的三维几何模型，本文还研究了在通用四轴联动加工中心上加工锥齿轮齿形的方法和在通用三坐标测量机上进行锥齿轮齿面几何形状误差测量及数据处理方法。

The results show that the milling process simulation is an effective method to predict the machining deformation correctly.

研究表明，数值模拟方法是研究航空整体结构件铣削加工变形的有效方法，可正确预测零件的加工变形。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。