金属切削机床电气控制技术应用与进展

机床发展时间较长，而且在不断的进行改进和创新。机床已经是现代人们生产和生活的得力帮手，许多精密构建和机械零件人工制作效率很低而且质量不能够得到保证，通过机床能够高效、大量生产。现代机床的种类也很多如，数控机床、特种机床，镗床、金属切削机床等，机床种类不同进行的工作也不同…。金属切削机床是用来加工和切削各种特定几何形状的金属构件的机床，它能够达到指定求的表面加工质量和形状。金属切削机床的应用很广泛，实用性也很强。文章对金属切削机床进行介绍，总结技术切削机床电气控制技术的应用和进展。     

浅析如何对数控金属切削机床进行校验

作为金属切削机床的新型产品数控金屈切削机床,其的校验问题直接影响着机床的精度和效率,对数控金属切削机床的校验问题进行深入探讨,供同行参考.     

我国金属切削机床标准化工作取得重要进展

经过几十年标准化工作者的辛勤耕坛,尤其是标准化技术委员会成立以来,我国机床行业的标准化工作取得重要进展。截至到目前,金属切削机床、数控系统及安全等相关国家标准和行业标准共有820多     

卧式重型精密金属切削机床的动力模型研究

本文在文献[1] 基础上,进一步探讨卧式重型精密金属切削机床的双质点动力模型。本文建立的双质点力学模型能较好地精确预估机床与基础以及床头与工件的相对振幅,有利于保证机床投产后 的加工精度。本文成果对卧式重型精密金属切削机床的设备基础设计和施工具有实用参考价值。     

机床切割加工颤振的研究

在机床切削加工过程中,由于系统内部激发及反馈的相互作用,工件和刀具之间常常会发生强烈的振动,称为“颤振”。机床颤振会使加工过程变得不稳定,造成加工表面质量和金属切削率的下降,严重时甚至会破坏刀具和机床。因此,颤振成为提高机床加工能力的最主要障碍。对振动加以控制,掌握其规律是当面急需解决的难题。     

机床行业计算机辅助企业管理信息代码系统前五个系统完成报批将由标准出版社出版

机床行业为了加速计算机和成组技术在企业中的应用,在总结“六五”期间行业内开展计算机和成组技术应用的经验,于1986年先后责成沈阳第一机床厂、济南第二机床厂以及沈阳第三机床厂、上海机床厂、北京第一机床厂、无锡机床厂、宁江机床厂、第六设计研究院为课题组,研究适合机床行业的计算机辅助企业管理信息代码系统并委托北京机床研究所、全国金属切削机床标准化技术委员会归口,87年并纳入机械工业科学技术发展计划——课题编号87440397。经过课题组调研、制定方案、编写初稿、组织讨论、试套     

我国金属削机床标准化工作取得重要进展

经过几十年标准化工作者的辛勤耕坛，尤其是标准化技术委员会成立以来，我国机床行业的标准化工作取得重要进展。截至到目前，金属切削可机床、数控系统及安全等相关国家标准和行业标准共有820多项，其中国有标准88项，行业标准730多项。在这些标准中安全标准占5%、通用基础标准占10%、参数标准型谱标准占25%、技术条件标准占30%、产品精度标准占30%。这些标准构成了目前机床行业的基本标准体系。     

立式重型精密金属切削机床的动力模型研究

本文对立式重型精密金属切削机床的动力模型进行了研究，建立的双质点力学模型能较好地精确预估机床与基础间的相对振幅，有利于保证机床投产后的加工精度。     

机床产品外观设计的新动向

在一般人眼中,机床的核心价值是其加工能力,外观设计只是机床行业模仿消费品制造行业的作风,在机床设计工作结束以前对设计方案进行的局部修饰。然而,回顾工业设计的历史,机床其实是最早应用产品外观设计的行业之一,机床企业讲究产品外观的原因,除了对美的追求以外,更重要的是在市场形势出现变化时,提高自身产品在同类产品之间的竞争力。最近两年,世界机床产品市场开始了新一轮以外观设计为主题的竞争,这种变化的出现和近年机床市场形势转变有莫大的关系。     

天津市第二机床有限公司

正天津市第二机床有限公司是全国机床行业的重点生产企业,具有几十年的机床生产历史,公司被认定为高新技术企业、科技型中小企业,拥有市级技术中心,多次承担国家及天津市科技重大专项。我公司主要生产各种金属切削机床,主要是大型数控立式万能磨床、数控卧式车床,包括:大型高精度数控立式万能磨床(普通级、精密级、高精度级)、数控卧式车床、各类专用机床等共计40余种规格200余种产品,以及国家重点项目     

Structure Design of the Mobile Cutting Machine Tool Based on Pro / Engineer

In order to solve the existing problems of current metal cutting equipment,combined with the development situation of metal cutting industry in China,on this basis,a design can realize multi-shaped metal cutting machine tool. Introduces the working principle of the machine tool,the structure and parameters of the main component,and the establishment of the model by using the 3D modeling software Pro / Engineer（ Pro / E）;through listing the advantages of the mobile machine,shown that the metal machine tool has the structural characteristics of mobile,semi automated,can improve the cutting precision,increase cutting efficiency,and the utility market has certain value. It has guiding significance for the further study and the potential applications of the mobile cutting machine tool.     

空心铆钉冲切模设计

针对空心铆钉机加工工艺落后、生产效率低、材料利用率不高、切断后两端毛刺大而必须增加去毛刺工序等问题。介绍了一种采用冲压切断模具制作空心铆钉的方法。此工艺的关键是将待切断的空心铆钉部分套在凸模上,需切断分离管材部分用抽芯棒插入,避免被切断分离的管材部分冲切时变形。采用模具冲切,克服了用机加工生产空心铆钉的上述不足,产品质量得到了有效保证。     

Machining Parameter Optimization with Lot Size Considerations

The research literature on metal cutting contains numerous papers on optimizing machining parameters for maximum production rate or minimum production cost. Analyses presented in the literature, however, have been limited to conditions of “steady-state” manufacture (i.e., a large number of parts were to be produced). In today's metal cutting industry, over ninety percent of all parts are produced in lots of thirty or less. This implies that steady-state manufacturing may never be reached. This paper introduces lot size information into the selection of machine operating rates. A solution procedure is presented for the single decision variable (machine speed) case. An example problem is also presented to illustrate the gains that can be attained using lot size information.     

核心竞争力系统的演化

在对核心竞争力认识的基础上,以汽车工业不同生产方式的转变为线索,探讨了企业核心竞争力系统的演化过程,并结合对当今知识经济、组织学习及创新的思考,提出基于知识与创新的核心竞争力,并就处于战略联盟的企业群体的竞争优势提出一种新的观念－－核心能力链。     

构建卷烟工业企业核心竞争力的研究

借鉴企业战略管理理论研究的最新成果,结合烟草行业实际,对企业核心竞争力的概念、内涵及其构成要素进行了分析研究并构建了相关模型,重点对如何培育和增强卷烟工业企业核心竞争力提出了自己的见解。     

Heuristic optimization system for the determination of index positions on CNC magazines with the consideration of cutting tool duplications

This paper presents a meta-heuristic optimization system developed for the determination of optimal index positions of cutting tools on the tool magazines (automatic tool changer (ATC) or turret magazine, etc.) of CNC (computerized numerical control) machine tools. The selection of index positions is performed using a simulated annealing (SA) algorithm that takes the following as the input: (1) a list of cutting tools assigned to certain machining operations; (2) the number of copies of each cutting tool available in the workshop; (3) total number of index positions on the tool magazines; (4) the indexing time of a tool magazine of a CNC machine tool specified by manufacturer. Then, the SA algorithm determines index locations of cutting tools on the tool magazines. Dereli et al. and Dereli and Filiz previously studied the present problem by using genetic algorithms (GAs). However, the duplication of cutting tools was not taken into account in their works, although it can reduce the total tool-indexing time and therefore improve the productivity considerably. Nevertheless, the consideration of the ‘tool duplications’ makes the problem much harder to model and to solve. In this paper, a novel solution representation-scheme based on the SA, which enables easy manipulation during feasible neighbourhood solution generation, is proposed for the determination of the index positions of cutting tools on the CNC magazines with the consideration of ‘tool duplications’. Example problems are solved to present the implementation and merits of the proposed optimisation system. It is shown that it is possible to allocate the cutting tools in an efficient manner on the CNC magazines with the developed system.     

竹林皆伐机路径规划系统设计及计算机仿真

目的设计一种中幼竹林皆伐机路径智能规划系统,实现伐竹机伐竹的路径规划功能,使伐竹机可以遍历需要伐竹的全部节点并避开障碍。方法针对中幼竹林皆伐的特点,探讨一种迪杰斯特拉及A*混合算法,用于解决伐竹机路径规划中的路径优化问题。通过C语言编程,来建立一种基于改进的迪杰斯特拉及A*混合算法的中幼竹林皆伐机路径智能规划系统仿模型,并使用C++编程,实现系统模型的仿真,并调用Windows GDI实现仿真结果的显示。结果仿真结果显示,采用文中建立的中幼竹林皆伐机路径规划系统进行伐竹机的路径规划,实现了伐竹路径规划的目标,且相较直接采伐的路径,伐竹机伐竹总里程降低了47.6%,节省了伐竹机伐竹总里程,大大提升了伐竹效率。结论文中所讨论的改进的迪杰斯特拉及A*混合算法可以实现伐竹路径规划的功能,路径规划系统可以求得最优伐竹路径的一个近似解。     

飞剪式纸护角定长剪切机系统的研制

目的根据纸护角生产线的生产要求,设计一种满足纸护角连续送料时定长剪切的飞剪式定长剪切机构。方法运用旋转式飞剪原理,采用伺服系统的闭环控制,使飞剪式定长剪切机构能实现在定长剪切过程中对纸护角跟踪的"速度-位置双同步"。结果飞剪式定长剪切机构省去了传统机构在送料过程中剪切所需的停顿时间,大幅度提高了生产效率。同时,可以对不同厚度、不同长度以及不同送料速度的物料进行定长剪切。结论飞剪式定长剪切机构结构简单、使用方便、成本低廉,可广泛用于多种产品的定长剪切。     

环境保护与我国绿色包装的发展

我国的包装工业从无到有，从一个松散无序、比较落后的行业，发展成为一个能基本满足国民经济发展要求和基本有序的大行业。基本形成了以纸、塑料、金属、玻璃、印刷及包装机械为主要框架的独立完整、门类齐全的现代工业体系。但包装发展的同时也面临着环保的挑战，从环境保护出发论述了我国绿色包装行业的发展趋势。     

HMMs for diagnostics and prognostics in machining processes

Despite considerable advances over the last two decades in sensing instrumentation and information technology infrastructure, monitoring and diagnostics technology has not yet found its place in health management of mainstream machinery and equipment. This is in spite of numerous studies reporting that the expected savings from widespread deployment of condition-based maintenance (CBM) technology would be in the tens of billions of dollars in many industrial sectors as well as in governmental agencies. It turns out that a prerequisite to widespread deployment of CBM technology and practice in industry is cost efficient and effective diagnostics and prognostics. This paper presents a novel method for employing hidden Markov models (HMMs) for carrying out both diagnostic as well as prognostic activities for metal cutting tools. The methods employ HMMs for modelling sensor signals emanating from the machine (or features thereof), and in turn, identify the health state of the cutting tool as well as facilitate estimation of remaining useful life. This paper also investigates some of the underlying issues of proper HMM design and training for the express purpose of effective diagnostics and prognostics. The proposed methods were validated on a physical test-bed, a vertical drilling machine. Experimental results are very promising.