車床英語最新ppt課件

1、Lesson Fifteen Lathe一、一、new words?lathe leie n. 車床車床?1?headstock hedst?k n.主軸主軸箱，床頭箱箱，床頭箱?tailstock n. 尾架，尾座尾架，尾座?bed bed n.（機床）床身（機床）床身?tool-post tu:lp?ust n. 刀架，刀架，刀座刀座?cross-slide kr?s-slid n. 橫向橫向滑板，中拖板滑板，中拖板?sideward saidw?:dz ad. 側(cè)側(cè)面地，向旁邊地面地，向旁邊地?saddle s?dl n. 大拖板，床大拖板，床鞍鞍?carriage 5kAridV n.

2、（機床）（機床）溜板，拖板溜板，拖板?center sent? n.頂尖頂尖?turret t?rit n.轉(zhuǎn)塔轉(zhuǎn)塔?incorporate ink?:p?reit v. 包括，合并包括，合并?matter m?t? v. 要緊，有重要緊，有重大關(guān)系大關(guān)系?tapered teip?d a. 錐形的錐形的?nose n?uz n. 端部，管口端部，管口?feed fi:d n. 進給進給?lever li:v? n.杠桿，手柄，杠桿，手柄，把柄把柄?jaw n. 卡爪，虎鉗牙卡爪，虎鉗牙.?chuck t?k n. 卡盤，夾具卡盤，夾具 v. 用（卡盤）夾緊用（卡盤）夾緊?leadscrew

3、li:dskru: n. 絲杠，絲杠，螺桿螺桿?thread red n. 螺紋螺紋?pitch pit? n. 螺距，間距螺距，間距?turret lathe 轉(zhuǎn)塔車床，六角轉(zhuǎn)塔車床，六角車床車床?transverse movement 橫向橫向運動運動?reversing lever 反向柄反向柄?feed-shaft 光杠光杠?live center 主軸頂尖，活動主軸頂尖，活動頂尖頂尖?dead center尾架頂尖，固定尾架頂尖，固定頂尖頂尖?three-jaw universal chuck 三三爪萬能卡盤爪萬能卡盤?four-jaw independent chuck四爪卡盤四爪

4、卡盤Have a rest please!二、二、TextThe lathe is one of the most useful and versatilemachines in the workshop, and is capable of carrying out a wide variety of machining operations. The main components of the lathe are the headstock and tailstock at opposite ends of a bed, and a tool-post between them whic

5、h 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 doing.二、二、TextThe ordinary center lathe can accommodate only one tool at a time on the tool-post, but a turret lathe

6、 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 .The headstock incorporates the driving and gear mechanism, and a spindle which holds the workpiece and causes it to rotate at a speed whic

7、h 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 is what matters. 二、二、TextTapered centers in the hollow nose of the spindle andof the tailstock hold the work firmly between them. A feed

8、-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 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, an

9、d therefore the forward or backward movement of the tool-post. The gear which the operator will selectdepends on the type of metal which he is cutting andthe amount of metal he has to cut off. 二、二、TextCenters are not suitable for every job on the lathe. The operator can replace them by various types

10、 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 will 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 sa

11、ddle 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-screw, a long screwed shaft which runs along in front of the bed and which rotates with the spindle.二、二、TextThe lead-screw drives the tool-post forwards along th

12、e carriage at the correct speed, and this ensures that the threads on the screw are of exactly the rightpitch. 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 the threads. A reversing lever on the headstock enables him to reverse the movement of the carriage and sobring the tool back to its