機(jī)械工程專業(yè)英語課件--l-資料下載頁
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【正文】 achine Tools (b)調(diào)整方法。為了便于裝配、保證精度和消除磨損后相對移動構(gòu)件之間出現(xiàn)的“竄動”，有時在拖板內(nèi)裝入一個扁條。 機(jī)械工程專業(yè)英語 This is called a gibstrip. Usually, the gib is retained by sockedhead screws passing through elongated slots。 and is adjusted by grubscrews secured by lock nuts. 課文分析 Lesson 23 Fundamentals of Machine Tools 這種扁條被叫做“鑲條”。通常該鑲條用穿過長孔的沉頭螺釘頂住，而用平頭螺釘調(diào)整好后，用鎖緊螺母上緊． 機(jī)械工程專業(yè)英語 (c) Lubrication. Slideways may be lubricated by either of the following systems: 課文分析 Lesson 23 Fundamentals of Machine Tools (c)潤滑．導(dǎo)軌可用以下兩種裝置進(jìn)行潤滑： 1) Intermittently through grease or oil nipples, a method suitable where movements are infrequent and speed low. 間歇潤滑，通過潤滑脂嘴或油嘴進(jìn)行。這是一種適于運(yùn)動速度低而不頻繁運(yùn)動場合的潤滑方法． 機(jī)械工程專業(yè)英語 2) Continuously, . by pumping through a metering valve and pipework to the point of application。 the film of oil introduced between surfaces by these means must be extremely thin to avoid the slide “floating”. 課文分析 Lesson 23 Fundamentals of Machine Tools 連續(xù)潤滑，例如通過油閥和油道將潤滑油泵送到潤滑點(diǎn)。用這種方法引入兩表面間的油膜必定是很薄的，目的是避免使拖板“浮起”。 機(jī)械工程專業(yè)英語 If sliding surfaces were optically flat oil would be squeezed out, resulting in the surfaces sticking. 課文分析 Lesson 23 Fundamentals of Machine Tools 如果相對滑移表面似鏡面般平滑，油就會被擠出而導(dǎo)致表面粘貼。 Hence in practice slide surfaces are either ground using the edge of a cup wheel, or scraped. 因而在實踐中，拖板滑移表面是用凹面砂輪的刃進(jìn)行磨削或進(jìn)行刮研的。 機(jī)械工程專業(yè)英語 Both processes produce minute surface depressions, which retain “pocket” of oil, and plete separation of the parts may not occur at all points。 positive location of the slides is thus retained. 課文分析 Lesson 23 Fundamentals of Machine Tools 兩種工藝都可產(chǎn)生微小的表面凹痕，它就成為存油凹坑，相配合的零件就不會處處因“浮起”而發(fā)生完全分離，這樣使拖板確定保持接觸導(dǎo)軌。 機(jī)械工程專業(yè)英語 (d) Protection. To maintain slideways in good order, the following conditions must be met: 課文分析 Lesson 23 Fundamentals of Machine Tools 防護(hù)。為了維護(hù)導(dǎo)軌處于良好狀態(tài)，必須滿足以下條件： 機(jī)械工程專業(yè)英語 課文分析 Lesson 23 Fundamentals of Machine Tools 必須防止外面物質(zhì)，如切屑的進(jìn)入。具有一定形狀的導(dǎo)軌那是所期望的。在這種場合，是不可能進(jìn)入雜物的，例如使用倒 v形的導(dǎo)軌時，那就不可能保存碎屑雜物在導(dǎo)軌上。 1) Ingress of foreign matter, . swarf, must be prevented. Where this is no possible, it is desirable to have a form of slideways, which does not retain swarf, . the inverted vee. 機(jī)械工程專業(yè)英語 2) Lubricating oil must be retained. 課文分析 Lesson 23 Fundamentals of Machine Tools 必須保存潤滑油。 The adhesive property of oil for use on vertical or inclined slide surface is important。 oils are available which have been specially developed for this purpose. The adhesiveness of oil also prevents it being washed away by cutting fluids. 在垂直或傾斜的導(dǎo)軌面上使用的油要有粘性是很重要的，為了這種使用目的已經(jīng)專門研制出多種有用的潤滑油。油的粘性也要保護(hù)，以免被切削液沖毀。 機(jī)械工程專業(yè)英語 課文分析 Lesson 23 Fundamentals of Machine Tools 必須用防護(hù)罩來防止意外的損壞。 3) Accidental damage must be prevented by protective guards.
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