浅议数控车床刀尖半径补偿应用

数控车削编程刀尖点与切削点不重合是影响零件加工精度的重要因素之一。为满足数控加工高精度制造的要求,需对刀尖圆弧半径进行补偿。文章通过分析刀尖半径对零件加工精度的影响,介绍了消除刀尖半径对零件加工精度影响的方法及注意事项。     

浅谈工件在夹具中的过定位

本文叙述了工件在定位过程中,工件定位面加工精度较高时,为了提高系统刚性和定位稳定性,我们可以采用过定位来实现这些效果。     

浅谈数控车削如何提高零件精度

数控车床的加工精度直接影响机械零件的质量,因此加工精度的影响因素受到广泛关注.文中主要提到了利用刀尖圆弧和小技巧保证数控车床加工精度,对进一步探讨数控车床加工精度的提高措施有一定借鉴作用.     

J66叶片扩压器加工工艺分析

扩压器是离心式压缩机的重要组成元件之一,用以回收从叶轮出来的气体动能,使之转换为压能.扩压器主要分为有叶扩压器和无叶扩压器两种.当叶轮出口气流角较小时,通常采用叶片扩压器,以减小气流在扩压器内部的摩擦损失,提高效率.文章通过对扩压器工艺分析对比,阐述了对于小批量有叶扩压器,采用车削中心进行加工,可以在一次装夹下同时完成径向和周向叶片加工,保证了各尺寸及位置精度,并减少了夹具的制作,大大提高了生产效率.     

三通水管模具型腔板加工工艺改进

本文以三通塑料水管模具型腔板的加工为例,对形状和材料较特殊、加工难度较大的零件进行工艺分析;通过设计合理的加工工艺规程,配合专用的定位夹具,采用先进的电火花成型和数控加工中心加工,可以大大减少加工时间、换刀时间;既保证了型腔板的加工精度和产品质量,又最大限度地提高了生产率。     

风力发电机轮毂加工工艺攻关总结

一、简介1.项目来源由大连重工.起重集团委托我厂的风电轮毂试加工,该轮毂为球形铸件,高2514mm,周向均布3个风扇叶把合孔,其结构特殊,要求各面分度精确且加工精度高。2.目的意义轮毂是联接叶片与主轴的零件,其作用是承受风力作用在叶片上的推力、扭矩、弯矩及陀螺力矩然后将风轮的力和力矩传递到机械机     

超超临界机组隔板静叶片热电偶孔加工工艺分析研究

系统论述了超超临界机组静叶片热电偶孔加工工艺难点、加工方法,国产化加工手段后效率提升。     

弯板类零件结构设计与工艺性探索

研究、制定控制弯板变形的方法和措施,解决弯板气割变形以及上、下护罩组装、点对时对接处间隙大的问题,提高产品外观质量。通过修改护罩类零部件中的弯板、立板图纸和工艺,将弯板和立板的全部圆弧改为两端50mm直段,中部圆弧形状;修改立板的尺寸公差,圆弧半径公差按负差-3mm设计,取消划线、气割、找正三道工序,不用气割预留直边,避免气割过程中产生的弯曲变形和气割面垂直度误差,节约生产成本,满足外观质量要求。     

支撑板水平误差对转轮静平衡的影响分析

水轮机转轮是水轮发电机组的核心转动部件,是将水流势能转变成旋转机械动能,通过主轴传递给发电机实现能量转换的主体。水轮机转轮性能直接影响到发电机组的效率及运行稳定性,在制造厂加工过程中质量精度非常重要,工艺制造环节加工成品后需对转轮进行静平衡实验,平衡配重精度直接关系到水轮机组的运行稳定性、振动程度等重要指标。现分析了水轮机转轮在制造厂内进行静平衡过程中所使用的平衡专用工具支撑板倾斜度对平衡结果的影响,对提高产品质量和制造工艺控制,为客户提供合格提供理论依据。     

CAXA数控车软件在实际加工中的应用分析

在数控车床上通常只能做直线和圆弧插补，对于像椭圆等这类非圆曲线零件，大多采用直线或圆弧段逼近非圆轮廓，使用宏程序或自动编程软件进行加工。而本文研究CAXA数控车软件如何解决椭圆轴零件的加工，解决手工编程的繁琐工作，使用自动生成的加工程序，加工零件，从而保证工件的加工精度和加工效率。     

Development in Information and Communications Technology (ICT) Statistics at the Australian Bureau of Statistics

This paper outlines the ICT statistical developments that the ABS has undertaken over recent years. These developments have been on both the supply side (ICT industry) and the demand side (use of IT by sector). The content of ABS ICT surveys has changed significantly over the last few years and are expected to develop further in line with industry changes and emerging policy needs.
Recent developments in household collections have been the inclusion of IT use questions in the 2001 Census of Population and Housing and in various ABS social surveys such as Children's Participation in Culture and Leisure Activities. Annual business IT use surveys are now conducted and include topics such as Internet commerce and IT security. Biennial ICT industry surveys are conducted to provide data on ICT production, imports and exports, ICT industry employment, performance and structure information. An Internet activity survey is run every six months and provides regional Internet access details and infrastructure details on Internet service providers.
A major development for 2002–03 will be the compilation of an ICT satellite account. ABS intends to produce an ICT Information Development Plan to guide its future statistical development work in the ICT field.     

Incumplimiento del salario mínimo en Europa central y oriental

En este estudio se analiza el incumplimiento del salario mínimo durante el periodo 2003–2012 en diez países de Europa central y oriental con salario mínimo obligatorio nacional. A partir de los datos de EU‐SILC y la metodología propuesta por Bhorat, Kanbur y Mayet (2013), se cuantifica la incidencia y magnitud del incumplimiento. Se realizan análisis de regresión sobre determinantes individuales, laborales y macroeconómicos. Aunque la incidencia permanece relativamente baja, los trabajadores a los que se dirigen las políticas de salario mínimo parecen los más expuestos a su incumplimiento. Con el tiempo, una mayor incidencia se asocia a una razón más alta entre salario mínimo y salario medio.     

Value at Risk in the Suburbs: Eminent Domain and the Geographical Politics of the US Foreclosure Crisis

Several US counties and local governments have recently considered a novel solution to the foreclosure crisis. They plan to use eminent domain to compel the owners of mortgage debt—and specifically of private‐label mortgage‐backed securities—to sell the debt to the government at a price reflecting the loan's market value. The government would then restructure the debt and resell it to new investors. The plans are striking because—in contrast to both development‐driven eminent domain and the federal subprime bank bailout—they would force investors to assume asset devaluation and increased long‐term risk. Notably, the plans have emerged as an instance of financialization‐focused politics in suburbs and suburban cities of color, specifically majority‐black and ‐Latino/a suburbs. Local support for the plans, we argue, is rooted in the long‐term disinvestment of these ‘suburbs of exception', which became targets of subprime lending and eventually sites where the ‘financial exception' has been localized. But these demographic shifts, fragmentation and fiscal pressures have at the same time created a suburban political terrain in which the plans have gained their strongest political support.     

Towards a Theory of Serendipity: A Systematic Review and Conceptualization

Serendipity – the notion of making surprising and valuable discoveries – plays a major role in the success of individuals and organizations alike. Previous research has established the importance of serendipity and identified important individual- and organizational-level antecedents. However, the literature has been dispersed and the boundaries of the concept have been blurry, leading to a lack of conceptual clarity and structure, and thus limiting validity and managerial actionability. Based on a systematic literature review, I synthesize existing management-related research on serendipity and explicate the emergence and composition of serendipity in the organizational context. I first identify three necessary conditions that differentiate serendipity from related concepts such as luck or targeted innovation: agency, surprise, and value. Then, I draw from the literature on sensemaking, event-based theorizing, and quantum-based approaches to management to conceptualize the process of cultivating serendipity in the organizational context as a process of enabling potentiality and materialization, and develop a multi-level theory of (cultivating) serendipity. This conceptualization contributes to our collective understanding of how, why, and when (i.e., under what conditions) organizations can leverage the value in the unexpected, which opens up fruitful avenues for further research.     

Cultural Economy Planning in Creative Cities: Discourse and Practice

While a growing body of research analyses the functional mechanisms of the cultural or creative economy, there has been little attention devoted to understanding how local governments translate this work into policy. Moreover, research in this vein focuses predominately on Richard Florida's creative class thesis rather than considering the wider body of work that may influence policy. This article seeks to develop a deeper understanding of how municipalities conceptualize and plan for the cultural economy through the lens of two cities held up as model ‘creative cities’ — Austin, Texas and Toronto, Ontario. The work pays particular attention to how the cities adopt and adapt leading theories, strategies and discourses of the cultural economy. While policy documents indicate that the cities embrace the creative city model, in practice agencies tend to adapt conventional economic development strategies for cultural economy activity and appropriate the language of the creative city for multiple purposes.     

Accountability of NGOs in Bangladesh A critical overview

NGOs in Bangladesh have been recognized as effective change agents in the socio-economic arena throughout the world. Their contributions in micro credit, non-formal education and primary health care are widely known. NGOs play a significant role in society. NGO accountability, as a result, has become a critical issue. NGO accountability in Bangladesh has been examined here in relation to patrons, clients and themselves. Of the three relationships only accountability to patrons is in a near satisfactory state. Accountability to clients is handicapped by lack of opportunities of beneficiaries to participate meaningfully in NGO policy making. Accountability to themselves is adversely affected due to the adherence to a strictly hierarchical system and the influence of founding and charismatic NGO leaders.     

Input/output ranges and performance: an examination of US machine tool producers

Despite the establishment of high-tech multinational enterprises (MNEs) in Ireland since the late 1950s, the country did not succeed in closing the technological gap with most of its EU counterparts. The weak National System of Innovation (NSI), and in particular low business and government R&D levels, combined with a lack of research and technology linkages between MNEs and indigenous firms, explain these poor results. However, the Shannon region in the West of the country presents some specific institutional characteristics that could theoretically make the region a strong technological enclave. The various actors in the region - i.e. the administrative, financial, political and research institutions, as well as the business organizations - have indeed infused a new type of economic development. After a brief review of the available concepts and models articulated around these actors and their interrelationships, the paper analyses whether the Shannon region, taken as an illustrative example, mirrors a specific economic and technological localized setting. The study is based on a survey of indigenous and foreign firms.     

Sixty years of discrimination and diversity research in human resource management: A review with suggestions for future research directions

This article reviews discrimination and diversity research published in Human Resource Management (HRM) over the past 60 years. While discrimination and diversity are very different constructs, it is often informative to study them together, because when people recognize each other's diversity, this can result in bias, stereotyping, and discrimination. We conducted bibliographic searches for terms related to discrimination and diversity as well as a manual search through every title and abstract published in HRM over the last 60 years to assess article relevance. The search resulted in 135 research articles with 136 unique studies (i.e., samples) which are reviewed in this article. Sex and race are the demographics that have been examined the most in HRM, while religion has been examined the least. Moreover, the number of studies examining lesbian, gay, bisexual, transgender, and queer (LGBTQ) employees in the workplace in HRM has grown quickly within the past 10 years, culminating in a recent meta‐analysis. Our review looks at some of the earliest research published, the most recent research published, and the overall trends we identified in the research over the years for both discrimination and diversity articles. We then make future research suggestions and recommendations to advance the study of discrimination and diversity in the coming years.     

Ansätze und Ergebnisse anglo-amerikanischer M&A-Forschung

Based on a review of established U.S. management journals (1995–2003), six schools of thought are identified within the Anglo-American M&;A research: “Capital Market”, “Principal/Agent”, “Industrial Organization”, “Organizational Behavior”, “Human Resources” and “Strategic Management”. The literature review shows that the definition of M&;A success, the methods applied, and insights from empirical research differ according to the respective school of thought. Empirical studies focus on the resource combinations of merger partners, the specific circumstances of merger negotiations, and on integration management as antecedents of merger performance. Unfortunately, empirical findings have not yet provided reliable explanations for M&;A success. Based on the current state of Anglo-American M&;A research, the authors discuss implications for business practice, identify research gaps, and propose areas for future research.     

Towards an Asian model of human resource management? A comparative analysis of China,Japan and South Korea

There has been much discussion regarding the possible decline and weakening of national systems of human resource management (HRM). Yet, culture and institutions are often cited as the major stumbling blocks to this outcome. Such constraints may dissipate in the analysis, particularly if ‘regional clusters’ are considered where geographic and cultural closeness and ‘openness’ to similar economic pressures exist. In such cases, it might be postulated that convergence in HRM will occur. We argue that China, Japan and South Korea represent such a cluster. This article examines these countries, to see if a degree of convergence is taking place and if it is towards an identifiable ‘Asian’ model of HRM. A model of change is presented that distinguishes between levels of occurrence and acceptance. Details of the development and practice of HRM in each country are then set out. The article ends with a discussion and implications section and a brief conclusion.