車床英語(yǔ)PPT學(xué)習(xí)教案

1、會(huì)計(jì)學(xué)1車床英語(yǔ)車床英語(yǔ)Lesson Fifteen Lathe 一、一、new words w lathe lei n. 車床車床w headstock hedstk n.主主軸箱，床頭箱軸箱，床頭箱w tailstock n. 尾架，尾座尾架，尾座w bed bed n.（機(jī)床）床身（機(jī)床）床身w tool-post tu:lpust n. 刀刀架，刀座架，刀座第1頁(yè)/共14頁(yè)w cross-slide krs-slid n. 橫向滑板，中拖板橫向滑板，中拖板w sideward saidw:dz ad. 側(cè)面地，向旁邊地側(cè)面地，向旁邊地w saddle sdl n. 大拖板，大拖板，床鞍

2、床鞍w carriage 5kAridV n.（機(jī)（機(jī)床）溜板，拖板床）溜板，拖板w center sent n.頂尖頂尖w turret trit n.轉(zhuǎn)塔轉(zhuǎn)塔第2頁(yè)/共14頁(yè)w incorporate ink:preit v. 包括，合并包括，合并w matter mt v. 要緊，有要緊，有重大關(guān)系重大關(guān)系w tapered teipd a. 錐形的錐形的w nose nuz n. 端部，管口端部，管口w feed fi:d n. 進(jìn)給進(jìn)給w lever li:v n.杠桿，手柄杠桿，手柄，把柄，把柄w jaw n. 卡爪，虎鉗牙卡爪，虎鉗牙.第3頁(yè)/共14頁(yè)w chuck tk n.

3、卡盤，夾具卡盤，夾具 v. 用（卡盤）夾緊用（卡盤）夾緊w leadscrew li:dskru: n. 絲杠，螺桿絲杠，螺桿w thread red n. 螺紋螺紋w pitch pit n. 螺距，間距螺距，間距w turret lathe 轉(zhuǎn)塔車床，六轉(zhuǎn)塔車床，六角車床角車床w transverse movement 橫橫向運(yùn)動(dòng)向運(yùn)動(dòng)第4頁(yè)/共14頁(yè)w reversing lever 反向柄反向柄w feed-shaft 光杠光杠w live center 主軸頂尖，活主軸頂尖，活動(dòng)頂尖動(dòng)頂尖 w dead center 尾架頂尖，固尾架頂尖，固定頂尖定頂尖 w three-jaw un

4、iversal chuck 三爪萬(wàn)能卡盤三爪萬(wàn)能卡盤w four-jaw independent chuck 四爪卡盤四爪卡盤 第5頁(yè)/共14頁(yè)Have a rest please! 第6頁(yè)/共14頁(yè)知知之之者者不不如如好好之之者者好好之之者者不不如如樂(lè)樂(lè)之之者者孔孔子子第7頁(yè)/共14頁(yè) The lathe is one of the most useful and versatile machines in the workshop, and is capable of carrying out a wide variety of machining operations. The main

5、 components of the lathe are the headstock and tailstock at opposite ends of a bed, and a tool-post between them which holds the cutting tool. The tool-post stands on a cross-slide which enables it to move sideward across the saddle or carriage as well as along it, depending on the kind of job it is

6、 doing. 二、二、Text 第8頁(yè)/共14頁(yè)二、二、Text The ordinary center lathe can accommodate only one tool at a time on the tool-post, but a turret lathe is capable of holding five or more tools on the revolving turret. The lathe bed must be very solid to prevent the machine from bending or twisting under stress . T

7、he headstock incorporates the driving and gear mechanism, and a spindle which holds the workpiece and causes it to rotate at a speed which depends largely on the diameter of the workpiece. A bar of large diameter should naturally rotate more slowly than a very thin bar, the cutting speed of the tool

8、 is what matters. 第9頁(yè)/共14頁(yè)二、二、Text Tapered centers in the hollow nose of the spindle and of the tailstock hold the work firmly between them. A feed-shaft from the headstock drives the tool-post along the saddle, either forwards or backwards, at a fixed and uniform speed. This enables the operator to

9、 make accurate cuts and to give the work a good finish. Gears between the spindle and the feed-shaft control the speed of rotation of the shaft, and therefore the forward or backward movement of the tool-post. The gear which the operator will select depends on the type of metal which he is cutting a

10、nd the amount of metal he has to cut off. 第10頁(yè)/共14頁(yè)二、二、Text Centers are not suitable for every job on the lathe. The operator can replace them by various types of chucks, which hold the work between jaws, or by a front-plate, depending on the shape of work and the particular cutting operation. He wi

11、ll use a chuck, for example, to hold a short piece of work, or work for drilling, boring or screw-cutting. A transverse movement of the tool-post across the saddle enables the tool to cut across the face of the workpiece and give it a flat surface. For screw-cutting, the operator engages the lead-sc

12、rew, a long screwed shaft which runs along in front of the bed and which rotates with the spindle. 第11頁(yè)/共14頁(yè)二、二、Text The lead-screw drives the tool-post forwards along the carriage at the correct speed, and this ensures that the threads on the screw are of exactly the right pitch. The operator can select different gear speeds, and this will alter the ratio of spindle and lead-screw speeds and therefore alter the pitch of