【導(dǎo)讀】模具設(shè)計(jì)需要專業(yè)的知識(shí)、技能，最重要的是擁有該領(lǐng)域的經(jīng)驗(yàn)。得在反復(fù)試驗(yàn)的基礎(chǔ)上進(jìn)行。這會(huì)增加生產(chǎn)成本，并造成設(shè)計(jì)上的不一致。中的信息是非確定的。一旦開發(fā)了模具設(shè)計(jì)工具，它將指導(dǎo)使用者根據(jù)不同客戶的要。求，為其塑料零件選擇合適的模具。一致性，這種一致性會(huì)在零件質(zhì)量和零件成本上表現(xiàn)出來的問題。并行工程和CAD/CAM系統(tǒng)。設(shè)計(jì)方面的指示，通過減少在產(chǎn)品開發(fā)設(shè)計(jì)階段的工程變更，有助于減少一些工時(shí)。該系統(tǒng)將用于注塑設(shè)計(jì)，設(shè)計(jì)迭代和流程整合。目前的過程由許多手工計(jì)算、CAD圖。一旦工程師完成設(shè)計(jì)，這將是性能評(píng)估。該IKEM項(xiàng)目已分為三大模塊。在一個(gè)CAD模型的形式下輸入，和。另外，在標(biāo)準(zhǔn)的CAD軟件中需要大量的時(shí)間去考慮模具的建模組件。的塑化能力，廢品率等問題也會(huì)影響到模架的模腔數(shù)量。以設(shè)在循環(huán)模腔的任何周圍點(diǎn)，但當(dāng)填補(bǔ)矩形腔時(shí)，必須從中部流進(jìn)。該公約不是用一個(gè)直徑范圍定位水道在模具壁上。雖然大部分的輸入如模腔數(shù)、腔的圖

　　

【正文】 . Mold Dimensions for various binations of Inserts and Cavities The case where the number of cavities is one and the number of inserts is one has the same mold dimensions as the case where the number of cavities is two and four. The three cases can be reduced to one single rule: If Number Of Inserts=1 Then Mold Width = (Insert Width + 2) Mold Length = (Insert Length + 2) Mold Thickness = Insert Thickness End If The rules are arranged in modular fashion using a standard programming language for the sake of convenience and clarity. Each module generates a set of outputs, which would be inputs for other modules. Testing the application The intelligent mold design application is validated using various test cases. For each case the part information, mold information and the machine information are varied and a human expert validates the results of feeding this info into the application. Table 2 shows one such test case where the part requires two cavities and there are no inserts present. The application gives the approximate mold dimensions, runner dimension, sprue dimension and runner length based on the cavity image dimensions and other information. Input Number of insets 0 Insert Length 0 Insert Width 0 Insert Thickness 0 Cavity image Length Cavity image Width Cavity image Depth Waterline Di Number of parts to be produced 1000 Time Available 6 Cycle time 26 Reject Rate Shots per minute Material ABS Output Program Output Number of cavities 2 Mold Length Mold Width Mold Thickness Runner Diameter Runner Length Big end sprue bush diameter Table 2. Typical test case showing program input and output. The mold dimensions obtained are very close to a typical human expert design for the test case but do not suggest explicitly the use of a standard mold base, like a specific mold from the DME mold base catalog. The mold dimensions are however useful in selecting appropriate mold base from the mold catalogs. The runner dimensions are based on the material being used and therefore are limited to a specific range of shot size. 3 Summary This paper presents the approach adopted towards developing an intelligent mold design application that performs mold base selection based on user input. The knowledge acquisition process is done by first designing a mold base in close consultation with an industry expert and also by collecting deterministic information from hand books and data sheets. The collected information, which can be both qualitative and quantitative knowledge about the mold selection process, is represented in the form of rules arranged in different modules. Decision tables are used to reduce the size of rule base and make the rule base prehensive in the problem domain. The application developed using the rules in different modules is then tested for its validity when it es to selecting appropriate mold bases for plastic parts manufactured in the industry References 1. Chambers T. L., Parkinson A. R., 1998, “Knowledge Representation and Conversion of Hybrid Expert Systems.” Transactions of the ASME, v 120,pp 468474 2. Koelsch, James R., 1999, “Software boosts mold design efficiency“ Molding Systems, v 57, n 3, p 1623. 3. Lee, RongShean, Chen, YuhMin, Lee, ChangZou,1997 “Development of a concurrent mold design system: A knowledgebased approach”, Computer Integrated Manufacturing Systems, v 10, n 4, p 287307 4. Steadman Sally, Pell Kynric M, 1995, “ Expert systems in engineering design: An application for injection molding of plastic parts“ Journal of Intelligent Manufacturing, v6, p 347353. 5. Fernandez A., Castany J., Serraller F., Javierre C., 1997, “CAD/CAE assistant for the design of molds and prototypes for injection of thermoplastics “Information Technological, v 8, p 117124. 6. Douglas M Bryce, 1997, “Plastic injection molding Material selection and product design”, v 2, pp 148. 7. Douglas M Bryce, 1997, “Plastic injection moldingMold design fundamentals”, v2, pp 1120. 指 導(dǎo) 教 師 評(píng) 語 外文翻譯成績(jī)： 指導(dǎo)教師簽字： 年 月 日