Design for Manufacturing and Assembly最新文献

{"title":"A Knowledge-Based System Methodology for Conceptual Design of Mechanical Systems","authors":"Wang Zhao, A. El-Gizawy, S. B. Billatos","doi":"10.1115/imece1996-0001","DOIUrl":"https://doi.org/10.1115/imece1996-0001","url":null,"abstract":"\u0000 This paper presents a knowledge-based system methodology, called Domain Knowledge Transformation (DKT), that can be used at the conceptual design stage of mechanical systems. The DKT model is a two-levels process that reveals the insights of the methodology. In the first level, defined as the preconcept level, a list of design specifications is developed through the interaction between an intelligent system and the users or customers. In the second level, defined as the concept level, design solutions are generated using a functional requirements mapping (FRM) method. Design using FRM is characterized by the ability to structure hybrid sets of design knowledge, relevant information and customer needs. FRM method define results of current design efforts, future tasks and their priorities, various metrics, and a presentation format for decision making. After briefly introducing the DKT methodology, the paper shows how design requirements are generated and stored by questions and answers interface, objective tree guided structured interview and the dynamic knowledge base in the preconcept level. The paper then shows, through a real world design example, how FRM can be used to provide a detailed association between statements of design requirements (customer needs) and the physical entities proposed as solutions. The paper concludes that DKT methodology could be a useful concurrent engineering tool in the early design stage.","PeriodicalId":246034,"journal":{"name":"Design for Manufacturing and Assembly","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125849906","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Improving Feature Extraction Through Closely-Coupled Integration of Fixture Analysis","authors":"Fernando Castano, Daniel M. Gaines, C. Hayes","doi":"10.1115/imece1996-0002","DOIUrl":"https://doi.org/10.1115/imece1996-0002","url":null,"abstract":"\u0000 This paper presents a view of feature extraction as a process that involves consideration of manufacturing tools, processes and the fixtures to be used. This view is implemented in MEDIATOR. Some feature extractors use almost entirely geometric considerations [29], others use process and tool information which is often implicitly encoded in the data structures to help guide the feature extraction process. Our view of feature extraction is similar to the second approach in that process and tool information is also used. However, we take this approach one step further and also use fixture information to determine features. The reason behind this is that a feature is considered relevant because there is a method for producing it in the task domain. The set of possible tools, tool motions and fixtures that can be used is generated during feature extraction in MEDIATOR and selection of specific fixture and details are done later in process planning. Advantages of this method include the ability to use task information to strongly constrain the search for valid features, increased likelihood that features recognized will be manufacturable and directly usable by the process planner, and ease of modifying the feature extractor.","PeriodicalId":246034,"journal":{"name":"Design for Manufacturing and Assembly","volume":"153 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116725609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An Analogical Problem Solving Approach to Planning for Disassembly","authors":"I. Zeid, S. Gupta, T. Bardasz","doi":"10.1115/imece1996-0008","DOIUrl":"https://doi.org/10.1115/imece1996-0008","url":null,"abstract":"\u0000 Disassembly has been emerging as an important potential response to recent environmental and recycling regulations as well as resource conservation needs. One can identify two distinct approaches to tackle the disassembly problem, viz., design for disassembly (DFD) and planning for disassembly (PFD). This paper focuses on the PFD approach. The evolution of a disassembly plan may require some heuristics and domain specific knowledge. In addition, disassembly planners may have a particular style to solve disassembly problems. Due to these facts and the nature of the PFD itself (open ended and iterative), the paper proposes the use of Analogical Problem Solving (APS) as an approach to assist planners to solve PFD problems. APS is based on the sensible notion that problem solving can be assisted by the reuse of solutions to similar problems encountered in the past. The framework of applying APS to PFD, the merits of this approach, and the issues relating to its use for PFD are discussed.","PeriodicalId":246034,"journal":{"name":"Design for Manufacturing and Assembly","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128496088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cutting Fluid Mist Formation in Machining via Atomization Mechanisms","authors":"Y. Yue, J. Sutherland, W. Olson","doi":"10.1115/imece1996-0004","DOIUrl":"https://doi.org/10.1115/imece1996-0004","url":null,"abstract":"\u0000 Fundamental mechanisms of cutting fluid mist formation via atomization are investigated. As the cutting fluid impacts a stationary flat workpiece surface, a liquid film develops over the surface and disintegrates into droplets. Past research has shown the Sauter mean diameter of the droplets to be proportional to the film thickness. For a cutting fluid jet impinging on a rotating workpiece, three different disintegration modes (drop mode, ligament formation mode and film formation mode) are considered. The critical flow rates for the transition and diameters of drops are evaluated respectively.","PeriodicalId":246034,"journal":{"name":"Design for Manufacturing and Assembly","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129585927","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Practical Approach to Design for Quality","authors":"G. Abdou, N. A. Basaly, S. B. Billatos","doi":"10.1115/imece1996-0006","DOIUrl":"https://doi.org/10.1115/imece1996-0006","url":null,"abstract":"\u0000 To be successful in a competitive business environment, it is important to deliver products that meet customer’s requirements with respect to quality, cost, and delivery schedule. But to continue to be successful in a global competitive environment, it is important to improve product quality continuously. To improve product quality, product development cycle must be examined thoroughly and continuously and methods of shortening this cycle must be developed.","PeriodicalId":246034,"journal":{"name":"Design for Manufacturing and Assembly","volume":"132 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127365395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Concurrent Engineering and the Virtual Factory: Developing Products With Supply Chains","authors":"Sammy G. Shina, A. Saigal","doi":"10.1115/imece1996-0005","DOIUrl":"https://doi.org/10.1115/imece1996-0005","url":null,"abstract":"\u0000 Several recent developments have led to significant changes in the way new products are developed. The emphasis on core competency has resulted in having many companies discard their manufacturing capability, and hence becoming dependent on outside manufacturing suppliers. At the same time, the cost of acquiring expensive modern manufacturing equipment has become prohibitive, and the pace of new manufacturing technology has quickened, making companies reluctant to invest in their manufacturing plants lest they become obsolete in a short time. In addition, the advent of global competition for quality and cost has increased the need for new product design teams to incorporate early manufacturing feedback into the design of the products. The confluence of these issues have led to a set of unique problems and trends in modern industry. Manufacturing has become a worldwide commodity through the growth of contract manufacturing companies, which supply product companies with manufacturing expertise and capability. The companies’ relationships with product design teams is much more formal and subject to a contractual bidding process, without the benefits of detailed designs that can be bid on.\u0000 This paper addresses the conflicting issues raised above by identifying the changes required to the traditional methods of new product development and proposing a set of tools and metrics to address issues of manufacturing supplier selection, communications, cost, quality and capability in the new product development cycle. Methodologies and tools discussed in this paper include the modification of the product development process to include the contractors’ role in the timely execution of the project plans, the necessary identification of cost and quality for each manufacturing technology as well as volume level, and the clear understanding of the tradeoffs involved in the design and manufacturing process selection. In addition, the paper explores the issues of reduced manufacturing expertise within the parent company. As manufacturing becomes a world wide commodity, a good understanding of these issues is very important to the future survival of the manufacturing contracting enterprise. Contract manufacturers need to balance their investments in maintaining the technological edge in the manufacturing process, successfully bidding on their customers new products and clearly identifying their capabilities and levels of capacity, costs and quality without the risk of exposing their future strategy.","PeriodicalId":246034,"journal":{"name":"Design for Manufacturing and Assembly","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126178184","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Stereolithography Method for the Rapid Manufacture of Glass-Fiber-Reinforced Composites","authors":"G. Zak, Naftali M. Sela, Chul B. Park, B. Benhabib","doi":"10.1115/imece1996-0003","DOIUrl":"https://doi.org/10.1115/imece1996-0003","url":null,"abstract":"\u0000 Past attempts to improve the mechanical properties of stereolithographically manufactured parts by fiber reinforcement included: (i) use of long fibers laid out continuously in the polymer matrix; (ii) use of discontinuous fibers and glass microspheres and, (iii) building of fiber-reinforced shells around a solidified resin part. However, these efforts have not led to the development of an effective manufacturing method for the rapid fabrication of reinforced plastic parts.\u0000 The goal of our research is the development of a manufacturing process for the rapid layered fabrication of polymer-based composite objects using short discontinuous fibers as reinforcements. This paper outlines the proposed process as well as some of the preliminary investigative work on depositing the fiber-resin liquid mixture from above, and analysis of the basic mechanical properties of the test samples.","PeriodicalId":246034,"journal":{"name":"Design for Manufacturing and Assembly","volume":"107 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123136894","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Using Near-Misses From Feature Recognition to Generate Redesign Suggestions for Increased Manufacturability","authors":"C. Hayes, Daniel M. Gaines","doi":"10.1115/imece1996-0007","DOIUrl":"https://doi.org/10.1115/imece1996-0007","url":null,"abstract":"\u0000 This paper presents a method for generating design alternatives aimed at making a mechanical part more manufacturable. The method is intended to be used in the context of a human-computer collaboration in which the computer suggests design alternatives and the designer decides which alternatives effectively meet his or her overall design goals. The mechanism presented in this work for producing design alternatives uses “near-misses” generated during the feature extraction process. Most approaches to suggestion generation produce design alternatives through use of library of alternatives. However, this is not a very general or flexible approach. The approach proposed in this paper offers a more general method that can replace the library method. Advantages include a more general mechanism for generating design alternatives, and generation of a broader variety of more contextually appropriate alternatives.","PeriodicalId":246034,"journal":{"name":"Design for Manufacturing and Assembly","volume":"1036 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123137617","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}