小车床尾座镗孔专用夹具设计

近年来,机械行业竞争越来越激烈,许多企业对生产效率和产品质量都提出了较高的要求。市场竞争要求产品既要质量好,又要成本低。使用工装夹具可以实现工件的快速装夹,减少辅助加工时间,降低加工成本。本文设计了一套小车床尾座加工的专用夹具,其特点是结构紧凑,操作迅速、方便、省力,可以保证较高的加工精度和生产效率。     

加工中心多个零件夹具设计

本文通过分析零件的特点及其技术要求,并根据此零件的特点;在保持其精度的前提下,为了提高生产效率,设计一次可以加工6个零件的加工中心夹具。分别介绍了零件的工艺、夹具设计分析、夹具的结构及工作原理。     

铣削两平行球面的专用夹具制作探讨

文章通过对圆锥体工件加工工艺的加工特点的研究,针对V形块夹紧或三爪卡盘夹紧装置的不足,设计出一套多工位圆锥体球面铣削专用夹具,并对圆锥体球面利用该夹具安装以及采用数控铣床进行编程铣削加工的加工工艺、编程方法等进行分析。该夹具在实际应用中既保证了产品的加工精度,又提高了生产效率。     

提高连接板加工质量和效率的方法

连接板是瓦楞纸箱机生产线上的一个零件,由于加工工艺设计不合理,加上夹具、刀具不能适应加工要求,导致产品合格率不高,严重影响生产。经过努力,改革夹具和工艺,提高产品质量和效率,满足了生产需要。     

六方头类零件钻具的研究

本新型万能通用夹具是适应多规格螺栓头部钻单孔所用,是利用通用化、万能化夹具而减少专用工装的派制,以节省工时、降低加工费用和提高加工效率为目标。本项目通过设计一套夹具,将钻套安装到可滑行钻模板上,V形块既是定位元件又是夹紧元件,同时配活动定位板,具有灵活可调突出显著特点,适应多尺寸定位的需求。同时可以加工六角头S7～S12mm的螺栓零件。     

提升轮体加工工艺的设计

提升轮体是立式洗瓶机上的一个较复杂的零件,由不锈钢铸造再经车铣加工而成,轮体上有15条T字型滑道,其尺寸精度、表面粗糙度和对称度都有较高要求,由于不锈钢材料加工性能不好且铣削加工后期被挖去的材料大部分使工件刚性变得很差,产生较大的变形,致使加工十分困难。文章介绍了从控制工件加工变形的角度设计了加工的铣削夹具和一套完整的加工工艺,经实际运用满足了零件设计精度要求,提高了效率并确保了产品的质量。     

机床专用夹具分析研究

本文基于专用夹具的设计和加工要求,举例分析其各部件尺寸、加工定位方案以及夹紧力计算过程,旨在提高产品质量和生产效率。     

浅析数控铣床加工特殊零件的夹具

在进行特殊零件专用夹具的设计时,为了提高加工精度,要注意定位基准的合理选择;若对加工效率有要求,可以考虑设计为一次装夹多个零件的专用夹具。另外,还要注意选择合适的夹具材料和夹紧力,以保证不对零件表面造成损伤。     

扁体十字孔零件专用夹具设计

本文通过对扁体十字孔零件图分析,在大批量生产时,设计专用夹具在CK6136S型数控车床上进行加工,不仅扩大了数控车床的加工范围,保证了形位公差的要求,而且降低了对操作者的技术要求,大大提升了生产效率。     

螺旋定心夹紧夹具的设计

本文介绍了螺旋定心夹紧夹具的设计方法和操作方法,此夹具能够准确、迅速的装夹摇臂零件,完成摇臂的28.5mm±0.1mm槽加工,同时提高了生产效率,缩短了加工时间,降低劳动强度,花费的成本少。     

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.     

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.     

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.     

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.     

Introduction of New Technology with a Sound Transition of the Input-Output Structure

We examine the general equilibrium repercussions associated with the introduction of new technologies, using the generalized Leontief system that allows technological substitutions. We show that an untested introduction of cost-increasing technologies in any industry may result in creating a non-productive technological structure that does not satisfy the Hawkins-Simon condition, following the autonomous dynamic adjustment process with structural transitions in the economic system. Therefore, we propose a practicable control scheme of introducing cost-increasing technologies that strictly avoids the creation of non-productive structures in all periods of structural transition, using the available information on the ex ante technological structure.     

The Creation of the Office for National Statistics

A new Office for National Statistics was created in the United Kingdom in 1996 following a series of developments designed to strengthen the relevance and integrity of statistics. This paper describes these fundamental changes and sets out a blueprint for future progress. It also sets current developments in the United Kingdom in an historical and international context.     

What helps? Women engineers' accounts of staying on

We have considerable understanding of the obstacles that women engineers encounter and the reasons that they leave the field, but we know less about what enables them to remain. Adopting an interpretivist approach, this article examines how a group of British women engineers in two FTSE 100 companies account for “staying on” in their male‐dominated work settings. We delineate four specific forms of help that facilitate women's retention in the field. We argue that exposure to help leads to women developing a habitus that enables them to continue working in engineering. To conclude, we draw on our findings to outline HR practices that will facilitate supportive relationships in the workplace and pave the way towards developing more positive organisational climates.     

论现代物流企业的发展观

物流业经过诸多年的发展目前已经成为最热门的行业之一,物流企业的注册数量也与日俱增,达到前所未有的规模。毋庸置疑,任何企业都希望自己迅速做强做大,并成为真正现代物流企业的典型代表,要实现这一目标一个首要问题就是要解决现代物流企业的发展观问题。     

浅谈大体积混凝土裂缝的控制

大体积混凝土的裂缝问题是实际工程中长期困扰工程技术人员的问题,其控制技术的研究是混凝土结构研究的热点问题,具有重大的学术价值和潜伏的工程背景。