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模具专业英语教程 LESSON 16…
2011-8-1
The purpose of any machine tool is to remove me...
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2011-8-1
SHAW INVESTMENT CASTING   The manufacture of ca...
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2011-8-1
Cold hobbing is a process in which a hardened s...

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模具专业英语教程 LESSON 16

编辑:语际翻译     2011-8-1         转载请注明来自  语际翻译公司 http://www.scientrans.com

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  The purpose of any machine tool is to remove metal. Each machine tool removes metal in a different way. For example, in one type (the lathe) metal is removed by a single point tool as the work is rotated, whereas in another type (the milling machine) a cutter is rotated and metal is removed as the work is progressed beneath it.①

  Which machine tool is to be used for a particular job depends to a large extent upon the type of machining required. There is, however, a certain amount of overlapping and some machine tools can be utilized for several different operations but it must not be assumed that the particular machine tool is restricted to the operation shown.

  The machine tools which will be found in the modern toolroom are as follows:

  i.Lathes for turning, boring and screwcutting, etc. The primary purpose of the lathe is to machine cylindrical forms. The contour is generated by rotating the work with respect to a single-point cutting tool.

  ii.Cylindrical grinding machines for the production of precision cylindrical surfaces. The cylindrical grinding machine is used for precision grinding cylindrical mould parts. Metal is removed by the action of abrasive grinding wheel which is brought into contact with a contra-rotating workpiece.

  iii.Shaping and planning machines for the reduction of steel blocks and plates to the required thickness and for ‘squaring up’ these plates②. As the primary purpose of a shaping machine is to produce flat surfaces, this machine tool is used in the initial preparation of mould blocks. The workpiece is mounted on a table and a reciprocating single-point tool removes metal in a series of straight cuts.

  iv.Surface grinding machines for the production of precision flat surfaces. An excellent surface finish combined with accuracy can be achieved on hard or soft steel with the surface grinding machine. The workpiece is mounted on a table which is reciprocated beneath a rotating abrasive grinding wheel and metal is removed in a series of straight cuts.

  v.Milling machines for the rapid removal of metal, for machining slots, recesses, boring holes, machining splines, etc. Milling is an operation in which metal is removed from a workpiece by a rotating milling cutter. The workpiece can be moved in three directions at right angles to each other with respect to the cutter. The three directions are longitudinal, transverse and vertical, respectively.

  vi.Tracer-controlled milling machines for the accurate reproduction of complex cavity and core forms. The principle of tracer-controlled milling machine is similar to that of the vertical milling machine in that an end mill cutter is used to remove metal in a series of cuts. With tracer-controlled milling, however, the required form is generated by causing a tracer, directly coupled to a cutting head, to follow a template or a model.③

  In addition to the above list of major machine tools there is, of course, ancillary equipment without which no toolroom would be complete. This includes power saws, drilling machines, toolpost grinders, hardening and polishing facilities, etc.

  New Words and Expressions

  lathe 车床,用车床加工

  overlappingn 重叠, 搭接;并用,同时进行

  toolroom 工具室;工具间

  turning 车削

  boring钻削

  screwcutting 车螺纹;螺纹加工

  contour 轮廓;周线

  precision精度;精密度,

  contra-rotating 逆时针旋转的

  workpiece 工件;加工件

  block 块,块状物;粗料, 金属块

  reciprocate [使]往复运动;互换

  accuracy 精确性, 正确度

  removal 移动, 排[切]除

  machining 机械加工, 制造

  slot 缝, 狭槽

  recess 凹处;凹进处

  spline 花键;方栓;键槽

  longitudinal 纵向的;经度的

  transverse 横向的, 横断的

  vertical 垂直的, 直立的,

  respectively 分别地, 各个地

  cavity 腔, 模槽;(铸造)型腔

  core 核心;型芯;

  hardening 硬化;淬火

  polish 磨[抛]光

  facility [常用复]设备;装置; 机构

  end mill cutter立铣刀

  machine tool 机床

  single point tool 单刃刀具

  milling machine 铣床

  cylindrical grinding machine外圆磨床

  cylindrical surface圆柱面

  abrasive grinding wheel砂轮

  shaping and planning machine牛头刨床

  flat surface平面

  surface grinding machine平面磨床

  milling machine铣床

  tracer-controlled milling machine仿形铣床

  ancillary equipment辅助设备

  power saw电锯

  drilling machine钻床

  toolpost grinder工具磨

  Notes

  [1] For example, in one type (the lathe) metal is removed by a single point tool as the work is rotated, whereas in another type (the milling machine) a cutter is rotated and metal is removed as the work is progressed beneath it.

  例如,一种机床(如车床)是工件回转,采用单刃刀具切除金属,而另一种机床(如铣床)是以刀具回转,工件进给的方式切除金属的。

  [2] Shaping and planning machines for the reduction of steel blocks and plates to the required thickness and for ‘squaring up’ these plates.

  牛头刨床,用于将钢坯和钢板加工成所需厚度尺寸,并使这些钢板长宽尺寸见方。

  [3] With tracer-controlled milling, however, the required form is generated by causing a tracer, directly coupled to a cutting head, to follow a template or a model.

  ?但是,在仿形铣削中,是由滚子直接与铣刀头耦连,紧靠在样板或靠模上,以获得零件所需外形。

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