四梭圆织机主传动系统改进与设计

2000-2001年,我公司陆续从浙江、常州购进了75台四梭塑料圆织机,组成了我公司塑料编织产品的主要生产群体。这批织机经多年的使用。发现主传动系统所采用的蜗轮减速机构,频繁地出现蜗轮磨损严重的现象,而且油封处漏油的现象也屡屡发生。当我们利用新机构对其进行更替改进后,经十几年的使用检验效果良好。杜绝了漏油现象减少了维修时间和维修费用。同时提高了开机时间,增加了产量,从而取得较好经济效益。本文就改造设计情况予以阐述。     

一种圆织机用梭子

本文介绍了一种圆织机用梭子,属于塑料编织机械领域,解决了现有技术中纬纱锭放卷时张紧力容易失效的问题,解决该问题的技术方案主要是梭体上设有弹性抵住纬纱锭的弹性件,梭体上铰接有摆杆,弹性件与摆杆联动,摆杆上设有刹车块,弹性件抵住纬纱锭使刹车块抵紧第一管座和/或第二管座.本技术主要用于确保纬纱张紧可靠、均匀放卷,提高编织质量...     

奥地利LRW4—560型圆织机的维修与改进

本文介绍对LRW-560型圆织机的梭轮、推梭轮、供油滑块、测布器及自动张力调节器等进行适当改进，提高技术经济效益的经验。     

LRW4—560型圆织机纺织袋折迭器的设计与安装

本文介绍LRW4－560型圆织机上设计并安装折迭器生产折选编织袋的经验。     

LRW4-560型圆织机编织袋折迭器的设计与安装

本文介绍LRW4-560型圆织机上设计并安装折迭器生产析选编织袋的经验。     

奥地利LRW4／560型圆织机技改续谈

本文介绍奥地利LRW4／560型圆织机的技术改造经验。     

S-STL-II480型凸轮收卷机改进与设计

2007年,我公司从浙江购进了SJ-2200造纱机,其收卷机在使用过程中,收丝纱锭产品质量达不到要求,纱锭两端起棱,两边高中间低。当我们利用原凸轮对其进行改进设计后,经四年的使用检验效果良好。杜绝了产品质量问题,提高了产品合格率,增加了产量,从而取得较好经济效益。本文就改进设计情况予以阐述。     

刍议数控机床的电气控制改进与设计

随着现代社会的发展,数控机床的应用越来越广泛,考虑到数控设备的成本,直接淘汰会造成巨大的浪费．因此就必须通过对机床关键部分的电气改进求得企业最大经济利益与社会效益的实现。本文从数控机床电气控制系统组成出发,阐述了电气改进的主要步骤及各环节中应予以注意的问题,以期能与同行交流。     

圆弧包络线在罗茨转子型线设计中的应用

罗茨转子是罗茨鼓风机、罗茨压缩机、罗茨流量计和罗茨真空泵等设备中最关键的核心部件。罗茨转子的设计成功与否，对这些设备的性能至关重要。本文使用计算机动画编程的方法，对圆弧包络线的生成和性质进行了研究，并将其应用于罗茨转子型线的设计中。文中还引入了形状系数c和峰顶系数c1，详细给出不同类型的圆弧型线的罗茨真空泵容积利用系数随形状系数c和峰顶系数c1的变化情况。文末给出了一个转子加工的实例。     

Optimum stacking sequence design of laminated composite circular plates with curvilinear fibres by a layer-wise optimization method

The optimum stacking sequence design for the maximum fundamental frequency of symmetrically laminated composite circular plates with curvilinear fibres is investigated for the first time using a layer-wise optimization method. The design variables are two fibre orientation angles per layer. The fibre paths are constructed using the method of shifted paths. The first-order shear deformation plate theory and a curved square p-element are used to calculate the objective function. The blending function method is used to model accurately the geometry of the circular plate. The equations of motion are derived using Lagrange’s method. The numerical results are validated by means of a convergence test and comparison with published values for symmetrically laminated composite circular plates with rectilinear fibres. The material parameters, boundary conditions, number of layers and thickness are shown to influence the optimum solutions to different extents. The results should serve as a benchmark for optimum stacking sequences of symmetrically laminated composite circular plates with curvilinear fibres.     

Development of a sequential optimization procedure for robust design and tolerance design within a bi-objective paradigm

Many practitioners and researchers have implemented robust design and tolerance design as quality improvement and process optimization tools for more than two decades. Robust design is an enhanced process/product design methodology for determining the best settings of control factors while minimizing process bias and variability. Tolerance design is aimed at determining the best tolerance limits for minimizing the total cost incurred by both the customer and manufacturer by balancing quality loss due to variations in product performance and the cost of controlling these variations. Although robust design and tolerance design have received much attention from researchers and practitioners, there is ample room for improvement. First, most researchers consider robust design and tolerance design as separate research fields. Second, most research work is based on a single quality characteristic. The primary goal of this paper is to integrate a sequential robust design–tolerance design optimization procedure within a bi-objective paradigm, which, the authors believe, is the first attempt in the robust design and tolerance design literature. Models are proposed and numerical examples along with sensitivity analysis are performed for verification purposes.     

Investigating reliability improvement of second-hand production equipment considering warranty and preventive maintenance strategies

A cost model for optimal reliability improvement of warranted second-hand production equipment is developed. The second-hand production equipment of age x is subjected to an upgrade action of a certain level u before it is sold with a Free Repair Warranty. We look at determining the optimal upgrade level when not performing and when performing periodic preventive maintenance (PM) during the warranty period. Two different PM strategies are considered: (a) periodic PM actions having the same efficiency level; (b) periodic multi-phase PM actions with a maintenance efficiency level which varies according to the phase. The proposed model aims at helping the dealer to find the optimal upgrade level to perform before selling the second-hand equipment, and to assess whether performing PM actions during the warranty period, according to a specific maintenance strategy, is worthwhile in terms of cost reduction. Numerical experimentations considering each PM scenario are performed in order to investigate how each PM strategy impacts the improvement level to be performed and the associated total expected cost. The obtained results showed that the expected total cost incurred by the dealer is governed by a sensitive trade-off between the warranty servicing cost and the costs associated with the reliability improvement, and with the PM performed during the warranty period. It is also found that the proposed new periodic multi-phase PM policy with an increasing maintenance efficiency level yields lower upgrade levels, inducing lower costs for the dealer.     

A tool for the conceptual design of production and operations systems

This paper proposes a conceptual design tool, based upon inferential design theory. It has been specifically developed for the design of production and operations systems, but its use can be extended to other engineering areas, such as mechanical and structural systems. Inferential design theory and its foundation in the inferential theory of learning are briefly outlined. Both theories are based on the idea of using specialised knowledge operators in learning and design, termed knowledge transmutations and design knowledge transmutations respectively. The 24 transmutations existing in the two theories are outlined, and a further 12 design-specific transmutations are proposed. These have been developed as a result of our research. A conceptual design process is proposed, in which design knowledge transmutations are used. A software tool for design, CREDO, is also described and an example of its use in the generation of design concepts for an after-sales service facility is presented. The conclusions discuss the initial methodological experience of using CREDO to generate design concepts. They are based on the introductory use of CREDO at Technion in Israel for teaching purposes. Directions for further research are also provided.     

Design for manufacturing and assembly/disassembly: joint design of products and production systems

Design for Manufacturing, Assembly, and Disassembly is important in today’s production systems because if this aspect is not considered, it could lead to inefficient operations and excessive material usage, both of which have a significant impact on manufacturing cost and time. Attention to this topic is important in achieving the target standards of Industry 4.0 which is inclusive of material utilisation, manufacturing operations, machine utilisation, features selection of the products, and development of suitable interfaces with information communication technologies (ICT) and other evolving technologies. Design for manufacturing (DFM) and Design for Assembly (DFA) have been around since the 1980’s for rectifying and overcoming the difficulties and waste related to the manufacturing as well as assembly at the design stage. Furthermore, this domain includes a decision support system and knowledge base with manufacturing and design guidelines following the adoption of ICT. With this in mind, ‘Design for manufacturing and assembly/disassembly: Joint design of products and production systems’, a special issue has been conceived and its contents are elaborated in detail. In this paper, a background of the topics pertaining to DFM, DFA and related topics seen in today’s manufacturing systems are discussed. The accepted papers of this issue are categorised in multiple sections and their significant features are outlined.     

Mind systems imitation and emulation framework for service design and production

Knowledge creation and knowledge are the primary sources of productivity, profitability and company growth in the twenty-first century. Our approach is to use brain-based metaphors and models to better understand what kind of services we should be able to design and produce now and in the future. We propose new kind of services that will be able to imitate, emulate and support the mind structures of individuals, groups, teams, companies and organisations in dynamic business situations. The services should support human memory systems, motivational systems, interpreting systems and automatic systems and their sub-systems as they are actively present in living human systems. We have named our approach as Mind Systems Imitation and Emulation Framework. Different engineering disciplines will be jointly responsible for developing and applying such services now and in the future. As an example, a Democratic Company Culture tool Accord is described.     

浅谈陶瓷膜装置在制药生产中设计和选型时应注意的问题

在制药生产中,发酵液的特点是菌丝浓度高、黏度大.陶瓷膜在制药生产中主要应用在预处理方面,由于设计和选型上的失误,导致使用效果并不理想.指出在设计和选型时特别要引起重视的方面有管路设计、膜芯孔径大小、串联级数、以及循环泵的选型.