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險,從效率和進一步提高產(chǎn)品開發(fā)的有效性。此外,如果一個模具用于產(chǎn)生一個項目,而因此自動設計對固有限制在一開始就相處得很好。當利用快速造型、CAD需要長時間,因此成為瓶頸。所有這些活動是傳統(tǒng)上由部分設計和模具制作人員按注射模順序的方式完成后塑料部件的設計。但隨著社會的過程中實施并行工程所有參數(shù)影響產(chǎn)品設計、模具設計、機械的選擇、生產(chǎn)排程、模具和加工成本被認為是盡早塑料部件的設計。這些工具幾乎讓工程師測試部分處理它在其正常使用壽命表現(xiàn)怎樣。CAE技術(shù)使人們有可能取代傳統(tǒng),順序決策程序和并行設計過程,其中各方之間是如何產(chǎn)生互動和分享信息,圖3塑料注塑、CAE及相關設計數(shù)據(jù)提供一個綜合的環(huán)境,為便于并行工程的設計、制造和模具部分,以及材料的選擇和模擬優(yōu)化工藝控制參數(shù)。這些改變可能發(fā)生在塑料部件模具的改變,如澆口位置、厚度變化、生產(chǎn)延遲,質(zhì)量成本、機械安裝時間,或是設計變更在塑料部件。但是隨著部分變得更為復雜,它變得相當困難的加工性能預測及部分不使用計算機輔助工具。為成功實施并行工程,必須有歸屬感從人人參與。一個基本特征,部分的部分保持平注射后,在注射操作原因變形問題。一批料中加入了不同取向的部分如圖5 b。 在模具的設計流程,分析了塑料部分進行了模具仿真分析軟件讓選拔的最佳澆口位置圖6。作為失真和陶瓷注射后的部分,至關重要的是,從功能的角度,它必須被保持在最低水平,同樣也使用軟件里面分析。6總結(jié) 在塑料注塑、CAD模型所得的塑料部分商業(yè)的3 D程序可用于部分性能和注塑工藝分析。這兩個工具幫助設計師和模具制造商生產(chǎn)良好的產(chǎn)品,更好的交付和更快的模具用較少的時間和金錢。 . draft angles, . Non reentrants shapes, . near constant wall thickness, . plexity, . split line location, and . surface finish, 2. material choice。 4. cost. In injection moulding, the manufacture of the mould to produce the injectionmoulded ponents is usually the longest part of the product development process. When utilising rapid modelling, the CAD takes the longer time and therefore bees the bottleneck. The process design and injection moulding of plastics involves rather plicated and time consuming activities including part design, mould design, injection moulding machine selection, production scheduling, tooling and cost estimation. Traditionally all these activities are done by part designers and mould making personnel in a sequential manner after pleting injection moulded plastic part design. Obviously these sequential stages could lead to long product development time. However with the implementation of concurrent engineering process in the all parameters effecting product design, mould design, machine selection, production scheduling, tooling and processing cost are considered as early as possible in the design of the plastic part. When used effectively, CAE methods provide enormous cost and time savings for the part design and manufacturing. These tools allow engineers to virtually test how the part will be processed and how it performs during its normal operating life. The material supplier, designer, moulder and manufacturer should apply these tools concurrently early in the design stage of the plastic parts in order to exploit the cost benefit of CAE. CAE makes it possible to replace traditional, sequential decisionmaking procedures with a concurrent design process, in which all parties can interact and share information, Figure 3. For plastic injection moulding, CAE and related design data provide an integrated environment that facilitates concurrent engineering for the design and manufacture of the part and mould, as well as material selection and simulation of optimal process control parameters.Qualitative expense parison associated with the part design changes is shown in Figure 4 , showing the fact that when design changes are done at an early stages on the puter screen, the cost associated with is an order of times lower than that if the part is in production. These modifications in plastic parts could arise fr om mould modifications, such as gate location, thickness changes, production delays, quality costs, machine setup times, or design change in plastic parts. Figure 4 Cost of design changes during part product development cycle (Rios , 2001) At the early design stage, part designers and moulders have to finalise part design based on their experiences with similar parts. However as the parts bee more plex, it gets rather difficult to predict processing and part performance without the use of CAE tools. Thus for even relatively plex parts, the use of CAE tools to prevent the late and expensive design changesand problems that can arise during and after injection. For the successful implementation of concurrent engineering, there must be buyin from everyone involved. 5. Case Study Figure 5 shows the initial CAD design of plastics part used for the sprinkler irrigation hydrant leg. One of the essential features of the part is that the part has to remain flat after injection。 Paul F. Jacobs, Marcel Decker, 2000 RS, Chen, YM, and Lee, CZ, “Development of a concurrent mould design system: a knowledge based approach”, Computer Integrated Manufacturing Systems, 10(4), 287307, 1997 B., “Simultaneous Engineering”, Mechanical Engineering , , , , 1998 A, Gramann, PJ and Davis B, “Computer Aided Engineering in Compression Molding”, Composites Fabricators Association Annual Conference , Tampa Bay, 200