套料钻在大直径深孔加工中的应用

通过实例对套料钻的结构、套料加工工艺进行阐述,并与传统的扁钻对比,说明套料加工对于大直径深孔加工是一种高效率、低成本的加工方法.     

Research on new software compensation method of static and quasi-static errors for precision motion controller

To reduce mechanical vibrations induced by big errors compensation, a new software compensation method based on an improved digital differential analyzer （DDA） interpolator for static and quasi-static errors of machine tools is proposed. Based on principle of traditional DDA interpolator, a DDA interpolator is divided into command generator and command analyzer. There are three types of errors, considering the difference of positions between compensation points and interpolation segments. According to the classification, errors are distributed evenly in data processing and compensated to certain interpolation segments in machining. On-line implementation results show that the proposed approach greatly improves positioning accuracy of computer numerical control （CNC） machine tools.     

加工柴油机机体大进给量高速强力铣削专用夹具的应用研究

通过对加工柴油机机体(两侧面)强力高效铣削专用夹具的应用研究，不仅从根本上解决了机体两侧面加工长期存在的扭曲变形难题，而且还对在大进给量高速强力铣削的加工状态下，如何提高夹具的适应能力进行了有益的探索，并取得了明显的效果。     

数控仿真软件教学应用探讨

根据数控教学中的难点问题,本文提出将数控仿真软件与数控教学相结合的模式,并且分析了数控仿真软件在教学过程中的优势和缺陷,提出相应的解决方案。     

数控车生产型案例在教学中的应用

文章首先分析了《数控加工技术》课程的性质和作用,对传统的教学内容进行了反思,之后从培养学生岗位能力和职业素质出发,在教学实践中引入数控车企业生产案例,实践证明,该方法符合职业教育的现实要求,极大提高了学生多方面能力。     

小厂商与大集群：河北清河羊绒产业的发展模式

通过对河北清河羊绒产业的发展模式进行实证研究,发现,清河羊绒产业的发展呈现出如下特征:它是在零自然资源乡村社区崛起的原发型产业集群;产业主体是规模不大却数量众多的民营中小厂商,产业集群的总体产值很高;围绕着羊绒分梳和深加工,清河已经形成一个关联产业集群;厂商之间存在一定的分工与协作;厂商自发地集中在地理接近的空间区域内。我们将这种发展模式概括为"小厂商,大集群"。     

数控铣削加工刀具运动轨迹研究

数控加工刀具运动轨迹是确定数控加工工艺的重要环节.刀具运动轨迹设计质量的好坏,将直接影响零件的加工质量及加工成本.针对典型零件的铣削加工,以切削力波动小,表面质量精度高为优化目标对数控铣削加工的几种刀具运动轨迹进行优选.     

数控加工仿真系统在教学中的应用

数控加工仿真系统的出现,使数控编程与加工由原来的理论教学,趋向于理论与实践的教学.数控加工仿真系统的安全、经济实用,即减少设备、场地和消耗等,在教学中的作用也体现出来.     

Effects of parameters in femtosecond laser micromachining on ablation of silicon

A series of ablation experiments on silicon surface by femtosecond laser system of 775 nm and 150 fs duration pulses were carried out.The morphological characteristics and the associated effect in the ablation were tested by atomic force microscope (AFM),scanning electron microscope (SEM),focused ion beam (FIB),and the optic microscope.The single pulse threshold can be obtained directly.For the multiple pulses,the ablation threshold varies with the number of pulses applied to the surface due to the incubation effect.By analyzing the experimental data,the thresholds of laser fluences under various laser pulse numbers were obtained,and the relationships between ablation area and laser energy and laser pulse number were concluded.Meanwhile,the periodic ripple structure on silicon surface was found.Under the condition of certain laser power,the number of laser pulse can influence the formation of ripples.     

利用VERICUT软件进行数控仿真加工教学研究

介绍了数控加工仿真软件VERICUT的作用、功能及与其他数控仿真类软件相比较的优点,并通过具体实例阐述了利用该软件进行数控加工仿真的一般步骤,阐明VERCUT软件在数控仿真加工的教学中的实用性与优越性。