机械结构设计中抗磨损的改造措施

机械结构磨损会带来机械安全系数降低、运转性能下降、产品生产质量难以达标等问题。加强机械日常检测与修复,在机械结构中进行抗磨损改造,在机械结构中制定相应的抗磨损改造措施,以降低机械磨损和提高使用寿命。     

浅谈机械密封

为了防止离心泵体内的液体外漏和空气从泵体的进口漏入,需要对旋转轴和静止的泵体之间的间隙进行密封。过去常采用填料密封,因缺点较多,近来已有逐渐被机械密封所取代的趋势。这主要是因为机械密封具有密封性好,工作可靠,泄漏量小,使用寿命长,功率消耗少等一系列优点,所以得到广泛应用。     

2012年度“中国纺机之星”用户最满意品牌调查企业产品推介(六)

本期推介的产品分别来自同和纺织机械制造有限公司、江苏雪亮电器机械有限公司、重庆金猫纺织器材有限公司以及无锡星卫星机械科技有限公司,产品涉及棉纺、针织、毛纺机械及专件器材等领域,这些产品在节能减排、提高生产效率、减少用工等方面具有较大优势。     

波纹管机械密封使用经验

1.波纹管机械密封的特点(图1) 波纹管机械密封的密封端面受力较均匀,追随性较好,可以在一定程度上弥补由于转轴的挠曲变形,设备振动,动环、静环与轴套的同轴度误差等因素所产生的端面间隙(一般要求小于1μm),从而减少机械密封的泄漏。与大弹簧型机械密封相比,它受轴套表面的腐蚀影响较小,波纹管机械密封的静环2是用螺栓紧固在机械密封压盖4上,而大部分弹簧型机械密封的静环基本上都是依靠“O”型密封圈同机械密封压盖的过渡配合以及流体压力与外弹簧的作用来密封,它要受到压盖密封面的配合尺寸及腐蚀程度的影响,密封效果较差。     

压力机滑动轴承修理公差配合的选择

压力机是金属板材冲压作业的主要设备,其特点是传动系统结构尺寸大,工作环境较恶劣,受交变冲击载荷频繁。因此,其传动件支承轴承(一般均为滑动轴承)必须充分润滑、运转灵活,而滑动轴承公差配合间隙是制约这一状态的主要因素。间隙偏小,不仅要求零件有较高的制造精度,而且其摩擦阻力也将增大,机械     

延长高温油泵机械密封使用寿命的措施

炼油厂高温油泵密封使用寿命短原因分析,采用将普通机械密封改为金属波纹管机械密封的措施,使高温油泵机械密封的平均使用寿命由6个月延长到13个月以上.     

J31-400型压力机离合器部分密封机构的改进

我厂有一台J31-400型压力机,在一年多的使用过程中,由于离合器部分密封机构漏气比较严重,曾先后两次更换密封环。该5密封机构(图1)使用寿命短,密封环1与密封套2两锥面配合要求比较高,零件加     

改进用于加工石墨电极的三爪卡盘

1.故障与原因石墨电极本体加工机床二工位的三爪自定心卡盘经常出现研死现象,每次都需人工清理、修刮、再研磨及抛光研伤面,费时费力,严重影响生产正常进行。特别是经反复修磨后,相关件配合间隙、几何精度严重超差,影响卡盘的回转精度。     

间隙可预调滚动轴承发热故障定量分析

间隙可调滚动轴承发热,经定量分析,采取重新调整轴承轴向间隙和调整轴承与轴承座孔的配合间隙等措施,使轴承恢复正常运转。     

减少资金占用 提高经济效益─—首都航天机械公司民品成品件走向市场供应之路初探

论述了成品件走向市场采购的必要性和可行性。对成品件物资国内市场的状况及其产品市场价格的趋势进行了分析，并以首都航天机械公司的轴承为例，分析了直接从市场采购的经济效益。     

Complexity in the telecommunications industry: When integrating infrastructure and services backfires

The emergence of pure Internet-based service providers has put many integrated telecommunications firms - industry incumbents that provide services on their own infrastructure - under massive pressure. While various pure service providers enjoy high performance, the products offered by the incumbents often cannot compete on either price or user experience. Conventional wisdom, however, might suggest the opposite: that coordinating both infrastructure and services might allow the incumbents to reap synergy effects and create superior products. To address this issue, this paper applies a complex systems perspective to the telecommunications industry. It conceptualizes telecommunications firms to be searching for good configurations of interdependent service and infrastructure activities that need to fit together to achieve high-performing product systems. Using a simulation model, the paper shows that integrated operators can indeed take advantage of the interdependencies between the infrastructure and the service domain, resulting in superior product performance. Integrating infrastructure and services, however, can backfire: because learning about both domains and their interdependence requires more time, performance in the short run will be lower than that of pure service providers that can focus on adapting their service-related activities to an infrastructure that is beyond their control. The paper characterizes the conditions under which these effects can arise and concludes with implications for management and policy.     

闭环产品服务系统的增值分析与协调机理研究

闭环产品服务系统中,提升价值增值的手段包括产品和服务两方面.在大量生产时代,产品的价值增值主要来自于原料转换的增值过程,这是“大产品小服务”的传统销售模式（服务是产品的附属品）.但随着消费市场需求的变化,目前价值增值不但来自于企业品牌形象、产品销售等前市场服务,而且越来越注重产品使用过程中的后市场服务和废弃后的回收再制造服务.产品服务和再制造的增值已经超过传统实体生产的价值创造,开始向“小产品大服务”的商业模式演进（产品成为服务的介体）.作为获取持久竞争优势的这一新盈利模式,闭环产品服务系统的提供商需要考虑全生命周期的经济效益和环境效益,涉及产品制造、服务运营和回收再造的交叉新领域研究,这必然会导致正向供应链的关系契约模式变革.     

New Industrial Financial Services: What Distinguishes the Winners

Robert Cooper and Ulricke de Brentani report the results of their study of firms participating in the industrial financial services industry. Using a self-administered questionnaire, they obtained data on 56 successful and 50 failed products and found that success and failure are strongly associated with eleven important dimensions: synergy, product/market fit, quality of execution of the launch, unique/superior product, quality of execution of marketing activities, market growth and size, service expertise, quality of execution of technical activities, quality of service delivery, quality of execution of pre-development activities, and the presence of tangible elements of the service offering. They report some surprises, including their observation that while new to the firm, products entail more risk than "close to home" ones, the resulting level of success is not sharply reduced.     

钻机新度系数综合评价的研究

通过介绍陆地ZJ45J钻机的损坏、失效类型，分析了目前在用的设备新度系数评价方法。按照钻机各设备的经济使用寿命，综合考虑各类设备对成套钻机使用功能的影响程度，引入钻机设备的权级系数，通过公式的优化，给出成套钻机的新度系数评价模式，从而为新度系数的评价探索出一个更符合钻机设备实际状态的新方法。     

A genetic algorithm based heuristic for two machine no-wait flowshop scheduling problems with class setup times that minimizes maximum lateness

Machine scheduling problem has been extensively studied by researchers for many decades in view of its numerous applications on solving practical problems. Due to the complexity of this class of scheduling problems, various approximation solution approaches have been presented in the literature. In this paper, we present a genetic algorithm (GA) based heuristic approach to solve the problem of two machine no-wait flowshop scheduling problems that the setup time on the machines is class dependent, and the objective is to minimize the maximum lateness of the jobs processed. This class of machine scheduling problems has many practical applications in manufacturing industry, such as metal refinery operations, food processing industry and chemical products production processes, in which no interruption between subsequent processes is allowed and the products can be grouped into families. Extensive computation experiments have been conducted to evaluate the effectiveness of the proposed algorithm. Results show the proposed methodology is suitable to be adopted for the development of an efficient scheduling plan for this class of problems in real life application.     

服务创新与有形产品创新之比较

服务业的迅猛发展使其在国民经济中的地位越来越重要,已经成为或正在成为现代经济生活的主导。在这样的背景下,服务创新受到了学术界和产业界的广泛关注。由于服务产品具有不同于有形产品的独特特征,服务创新也与有形产品创新有很多的不同。本文着重分析了服务创新与有形产品创新的不同之处,指出了二者之间的联系,明确了服务创新独特性,以便更好地探索服务创新的方法和规律。     

单层熔结环氧粉末外涂层防腐管质量问题

分析了单层熔结环氧粉末外涂层防腐管从产品生产到出厂运输再到现场使用的各个环节出现的质量问题,认为产品生产过程中除锈不合格,喷涂工艺存在缺陷以及产品在运输使用时操作不规范等导致熔结环氧粉末外涂层防腐管发生质量问题,严重影响了油气田集输管道的使用寿命,给长庆油田油气产量稳定发展埋下了隐患。提出了相应的改进措施。     

It Won't Fit! For Innovative Products,Sometimes That's for the Best

The degree of overlap (i.e., fit) between product development organizations' resources and the product development projects pursued has powerful performance implications. Drawing on organizational learning theory and the resource‐based view, this research conceptualizes and empirically tests the interrelationships between the levels of fit, innovativeness, speed to market, and financial new product performance. After reviewing the research literature relevant to resource fit and new product performance, the level of innovativeness is posited to be an important moderating and mediating factor, which is validated by analysis of data gathered from 279 product developing firms. Technological fit has a negative direct effect on both technological and market innovativeness, while the use of existing marketing resources (i.e., a high degree of marketing fit) positively impacts technological innovativeness. This suggests, consistent with findings from market orientation research, that a deep, long‐held customer understanding can promote technological innovativeness. The moderating hypotheses proposed are also well supported: First, a high degree of marketing fit has a more positive impact on performance for market innovative products (e.g., products which address a new target market or use a nontraditional channel for the firm). Drawing on a deep customer understanding is more critical to performance for market innovative products. Conversely, the benefits of marketing fit are limited where market innovativeness is lacking. Interestingly, the counterpart moderating role of technological innovativeness on technological fit's performance effect is not significant; the level of technological innovativeness does not significantly impact the performance impact of technological fit. There are also significant moderating effects across dimensions. Our results show that the financial benefit of using existing marketing resources is lessened for technologically innovative products. Technological innovations necessitate drastic adaptation of marketing resources (i.e., channel and brand); firms drawing only on existing marketing resources for a technologically innovative new product will incur reduced profit. Similarly, the positive implications of using existing technological resources are limited for products which are highly market innovative. Generally, resource fit is seen to have an (oft‐overlooked) dark side in product development, though several of our findings suggest that marketing resources are more flexible than are technological resources.     

The role of C-products in providing customer service—refining the inventory policy according to customer-specific factors

An approach is provided for categorizing C-products on the basis of their significance for the business through their customer service effects. In the approach, C-products are considered significant for two types of service reasons: (1) C-products, which are mainly sold to the most important customers, and (2) C-products, which are mainly sold in connection with A-products and are necessary for making a complete order. These customer service-related aspects are combined with product-related variables such as demand volume and variation to categorize the products into distinct clusters for which different service policies can be exercised. A self-organizing map, which is a flexible tool for clustering problems, is used for creating product groups. The approach is illustrated with an application of a wholesale company in a constructing business. As a result of the analysis, the C-products are categorized as service products (with local availability policy), slow response products (centralized stock policy), and non-important products (potential ones to be discarded).