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ations are ordered based on a system analysis to reduce tool changes and the number of tools used. On the CAM side, the trend is toward newer technologies and processes such as micro milling to support the manufacturing of highprecision injection moulds with 共 9 頁(yè) 第 8 頁(yè) plex 3D structures and high surface qualities. CAM software will continue to add to the depth and breadth of the machining intelligence inherent in the software until the CNC programming process bees pletely automatic. This is especially true for advanced multifunction machine tools that require a more flexible bination of machining operations. CAM software will continue to automate more and more of manufacturing’s redundant work that can be handled faster and more accurately by puters, while retaining the control that machinists need. With the emphasis in the mould making industry today on producing moulds in the most efficient manner while still maintaining quality, mouldmakers need to keep up with the latest software technologiespackages that will allow them to program and cut plex moulds quickly so that mould production time can be reduced. In a nutshell, the industry is moving toward improving the quality of data exchange between CAD and CAM as well as CAM to the CNC, and CAM software is being more “ intelligent” as it relates to machining processes— resulting in reduction in both cycle time and overall machining time. Fiveaxis machining also is emerging as a“ musthave” on the shop floorespecially when dealing with deep cavities. And with the introduction of electronic data processing (EDP) into the mould making industry,new opportunities have arisen in mouldmaking to shorten production time,improve cost efficienciesand achieve higher quality. 共 9 頁(yè) 第 9 頁(yè) 指 導(dǎo) 教 師 評(píng) 語(yǔ) 外文翻譯成績(jī): 指導(dǎo)教師簽字: 年 月 日 注: 1. 指導(dǎo)教師對(duì)譯文進(jìn)行評(píng)閱時(shí)應(yīng)注意以下幾個(gè)方面:①翻譯的外文文獻(xiàn)與畢業(yè)設(shè)計(jì)(論文)的主題是否高度相關(guān),并作為外文參考文獻(xiàn)列入畢業(yè)設(shè)計(jì)(論文)的參考文獻(xiàn);②翻譯的外文文獻(xiàn)字?jǐn)?shù)是否達(dá)到規(guī)定數(shù)量( 3 000 字以上);③譯文語(yǔ)言是否準(zhǔn)確、通順、具有參考價(jià)值。 在強(qiáng)調(diào)模具制造業(yè) 在維持質(zhì)量的同時(shí)還要以最高效的方式制造模具的今天,模具制造商們需要緊跟最新的軟件技術(shù)包,以便使他們能夠快速地規(guī)劃并制造出復(fù)雜的模具,從而減少模具生產(chǎn)時(shí)間。 在 CAM 方面,發(fā)展趨勢(shì)是新技術(shù)和新工藝,例如微研磨,以支持帶復(fù)雜三維結(jié)構(gòu)和高表面質(zhì)量的高精度注塑模具的制造。 對(duì)于一個(gè)好的 CAM 系統(tǒng),自動(dòng)化不僅僅體現(xiàn)在某個(gè)獨(dú)立的細(xì)節(jié)上。 模具的計(jì)算機(jī)輔助制造 減少制造費(fèi)用和研發(fā)周期的一 個(gè)方法是建立能夠充分發(fā)揮設(shè)備和人員潛能的制造系統(tǒng)。提高模具質(zhì)量,增進(jìn)團(tuán)隊(duì)合作,使設(shè)計(jì)人員從沉悶的日常工作中解脫出來(lái)。早在這個(gè)階段,就可以自動(dòng)生成圖紙和材料清單了。如果沒(méi)有一個(gè)標(biāo)準(zhǔn)的模具能滿足需要,則選擇和要求最接近的標(biāo)準(zhǔn)模具并做相應(yīng)修改 —— 通過(guò)調(diào)整限制和參數(shù)使得任意數(shù)量的任意尺寸的板子都能用于設(shè)計(jì)中?,F(xiàn)代 CAD 系統(tǒng)可支持該設(shè)計(jì),先針對(duì)確定好的畫(huà)圖方向計(jì)算出一條分模線,將零件分成模芯和型腔兩側(cè),并生成出流表面和截流表面。而 CAD 系統(tǒng)的軟件部分由允許其完成設(shè)計(jì)和畫(huà)圖功能的程序組成。 CAD 系統(tǒng)提供了一種高效的設(shè)計(jì)方法,并且當(dāng)它和坐標(biāo)測(cè)量機(jī)器和其他檢驗(yàn)設(shè)備結(jié)合使用時(shí)可用來(lái)創(chuàng)立檢驗(yàn)程序。最后這些新工藝還可用來(lái)制造復(fù)雜的零件。 CAD 允許你在屏幕上畫(huà)出模型,然后采用三維動(dòng)畫(huà)從各個(gè)角度進(jìn)行察看,最后通過(guò)在數(shù)字仿真模型上引入各類參數(shù) (壓力、溫度、沖力等 )進(jìn)行測(cè)試。當(dāng)活塞接近它行程的頂端時(shí),火花塞點(diǎn)燃混合氣?;钊麖男谐添敹说叫谐痰锥说倪\(yùn)動(dòng)叫做一個(gè)沖程,每個(gè)循環(huán)要求燃燒空氣燃油混合氣有四個(gè)沖程,因此,叫做四沖程循環(huán)?;钊炕钊h(huán)在氣缸里密封,當(dāng)活塞上下運(yùn)動(dòng)時(shí),活塞環(huán)沿著氣缸壁滑動(dòng)?;钊跉飧變?nèi)被膨脹氣體向下推,它又推動(dòng)連桿使得曲軸旋轉(zhuǎn),曲軸回轉(zhuǎn)產(chǎn)生能量推動(dòng)汽車(chē)。 如今大多數(shù)的汽車(chē)使用火花點(diǎn)火、四沖程、往復(fù)式汽油發(fā)動(dòng)機(jī)。 — 41 — 附件 7 密 級(jí) 分類號(hào) 編 號(hào) 成 績(jī) 本科生畢業(yè)設(shè)計(jì) (論文 ) 外 文 翻 譯