加工

In recent years, companies step up the development of the fast lane: the completion of the production run has been an annual output of 150,000 tons of pig iron smelting companies; under construction, the modernization of 30,000 tons annual output of castings and machining parts auto parts company has advanced Vertical shot molding pressure, the level of sub-type microseism compaction modeling line, self-hardening resin sand molding line, dual power supply frequency melting furnace, sand automated treatment systems, as well as CNC machining centers and machining equipment production lines production equipment, with direct-reading spectrometer, casthouse Express analyzer, Coordinate measuring instrument, ultrasonic flaw detector such as the modernization of non-destructive testing equipment and a full range of conventional detection equipment; at the same time the company has a skilled use of CAD / CMD technology design, manufacturing, machining workforce and more than ten years such as day, love and respect their jobs, and accumulated rich experience in foundry staff.

近年来，公司步上了发展的快车道：建成了已投产运行的年产15万吨生铁的冶炼公司；正在建设的现代化的年产30000吨铸件和机加工件的汽车零部件公司拥有先进的垂直分型射压造型线、水平分型微震压实造型线、自硬树脂砂造型线、双供电中频熔化炉、自动化的砂处理系统以及加工中心和数控设备组成的机加工生产线等生产设备，拥有直读式光谱仪、炉前快速分析仪、三坐标测量仪、超声波无损探伤仪等现代化的检测设备和齐全的常规检测设备；同时公司拥有一支熟练运用CAD/CMD技术进行设计、制造、机械加工的员工队伍和十几年如一日、爱岗敬业、积累了丰富经验的铸造员工队伍。

This artide describes the elliptical curve method to replace circular curre method and the principle of machining and mathematical equations. By using the mini-computer programs in Basic language, the machining parameters are computed which is important for prodution.

本文介绍以椭园曲线代替园弧加工方法及其加工原理、数学计算公式，并用Basic语言编制了微型机程序，以便于加工参数计算，对生产具有一定意义。

The main research work is detailed as follows: First, the characteristics of MEDM are mentioned and two basic conditions for achieving MEDM were pointed out, high precision of shaping movement and the minuteness of the erosion.

本文的主要工作如下：首先，根据微细电火花加工过程的特点，指出了实现微细电火花加工的两个基本条件，即：成形运动的高精度和加工蚀除的微细化。

Owing to the complexity of CIMS' missions,the reliability modeling should adapt the production processes accurately.Conventional reliability model method can not reflect the time dynamic behavior of CIMS,so the multitask reliability model based on generalized stochastic Petri nets is established for a CIMS manufacturing shop with multiple missions and the process times of the machines with exponential distributions.Furthermore,analysis of GSPN model based on behavior expression and moment generating function is presented,then can compute the transfer functions.Finally,the multitask reliability can be easily obtained without the reachability graph of Petri nets,which measure can reflect the operating performance of the whole multitask CIMS more intuitively.

CIMS生产的复杂性要求其可靠性模型可以精确地反映生产过程，由于传统的可靠性建模方法无法兼顾CIMS的时间动态特性，所以针对一个复杂的有多个加工任务的CIMS制造单元，由于其机器加工工件的时间均为指数分布，则采用广义随机Petri网进行多任务可靠性建模，在此基础上基于Petri网行为表达式，将矩母函数思想引入其中，不必生成可达标识图就可通过计算模型的传递函数，进而得到整个系统的多任务可靠度，该可靠性指标可以更直观地反映具有多种加工任务的整个CIMS的运行性能。

The Belvac 795 series Necker System was developed in response to canmaker requirements for ultra-high-speed necking and flanging machinery.

795系列颈缩加工系统根据罐生产的要求发展起来，使用极高速的颈缩加工和凸缘加工机械。

The interpolate algorithms of three-order NURBS curve and double three-orders NURBS surface are presented. The expressions of partial derivative and normal curvature of NURBS surface are derived by the theory of differential geometry. The geometric characteristics of different curvature area of the free-form surfaces are analyzed in detail. All these work lays a theoretical foundation for constructing the cutter location calculating model of free-form surfaces NC machining. 2 On the basis of analyzing the methods of cutter path generation, the standard of evaluating the various methods of cutter path generation is presented. The method of generating cutter path with constant scallop height is presented for the first time.

本文以提高复杂曲面多坐标数控加工精度和加工效率为目的，在对国内外研究现状进行深入分析的基础上，对数控编程中各环节的关键技术问题进行了深入研究，主要内容包括以下几方面： 1 分析了复杂曲面各种造型方法的优缺点，给出了根据各种边界条件所确定自由曲面的NURBS表示方法以及三次NURBS曲线曲面反算算法；用微分几何理论推导了NURBS曲面的偏导矢及法曲率计算表达式；对曲面不同曲率特性区域的几何特征进行了深入分析，为建立复杂曲面的数控加工刀位计算模型奠定了理论基础。

Non-linear error is an important source of the machining error in multi-axis numerical controlled machining and it is unavoidable.

非线性误差是多轴数控加工中加工误差的重要来源，在多轴加工中不可避免。

Having carried on the design with studying to the automatic graduation numerical control backward table of his major hardware device, thus widen the range of processing complex ruled surface by WEDM, and solved the problem in cutting parts with complex surfaces.

开发了能实现复杂型面零件电火花线切割加工的多轴联动加工系统，阐明了系统的组成和运动规律，研制了其主要硬件装置——数控回转台，并进行了加工实验研究。

Shaws idea that chip could be regard as a series of parallel orthogonal slices, a computing model of cutting force and cutting temperature based on orthogonal cutting simulation results is constructed in chapter 4, and a map is established between the three-dimensional cutting process and planar orthogonal cutting process.

第五章针对航空整体结构件铣削加工变形这一复杂的制造难题，建立了三维铣削加工的弹塑性热力耦合有限元模型，研究了材料模型、残余应力施加、刀具动态载荷、材料去除等铣削加工模拟所涉及的关键技术。

And then bring up to reform the ERP system from four aspects to adapt to the demand of ABC cost accounting process design, we(1)divide activity center according to process means、process object、process craft and concentration degrees of geography position,(2)revise production craft flow detailed list,(3) compile resource requirements planning,(4)compile activity input/ output control statement.

其次提出在ERP财务会计模块中构建ABC思想的思路，主要包括建立成本动因与产品、成本、费用之间的联系、设计适当的会计凭证、建立财务系统ABC核算流程；而后提出从四个方面改造ERP系统以适应ABC成本核算流程设计的需要，一是按加工手段、加工对象、加工工艺和地理位置集中程度四个条件划分作业中心、二是对生产工艺流程清单进行修订、三是编制资源需求计划、四是编制作业投入/产出控制报表。

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。