机械专业英语复习题

一、Place a “T” before sentences that are true and an “F” before those that are false

( F )1、The treatments that alter the surfaces including hardening treatments, high-energy processes and special treatments.

( F )2、The lathe bed is the main frame, involved a horizontal beam on two vertical supports. It is usually made of grey or nodular cast iron to damp vibrations and is made by casting.

( )3、In spite of that diversity of lathe-type machine tools, they all have common features with respect to construction and principle of operation. ( )4、Nitriding is somewhat similar to ordinary case hardening, but it uses a different material and treatment to create the hard surface constituents.

( F )5、The lathe is often called the father of the entire machine family.

( F )6、Jigs and fixtures are just the same which is used to lacate and clamp a workpiece.

( )7、Milling machine can not be used to produce a hole.

( )8、The dividing head is a device used to divide the diameter of a piece of workpiece into any number of equal parts.

( F )9、The parts program was now run from the computer’s menmory instead of from a tape that had to be rewound.

( F )10、In FMS, the production of part is controlled with the aid of a central computer.

( F )11、An HSS tool is usually made in the form of a single piece, contrary to cemented carbides or ceramic, which are made in the form of tips. The latter is brazed or mechanically fastened to steel shanks．

( F )12、Cutoff tools, which are sometimes called parting tools, serves to separate the workpiece into parts and/or machine external annular grooves.

( )13、Some of the useful properties of ceramics and glasses include high melting temperature, low density, high strength, stiffness, hardness, wear resistance, and corrosion resistance.

( )14、Hardening is the process of heating a piece of steel to a temperature within or above its critical range and then cooling it rapidly.

( )15、The primary purpose of annealing is to soften hard steel so that it may be machined or cold worked

( F )16、The major influence on surface finish are exerted by the feed rate and cutting speed. As the feed decreases, from the above equations, we can see that the roughness index decreases.

( )17、The continuous chip is characterized by a general flow of the separated metal along the tool face. There may be some cracking of the chip, but in this case it usually does not extend far enough to cause fracture.

( )18、The lathe bed is the main frame, involving a horizontal beam on two vertical supports. It is usually made of grey or nodular cast iron to damp vibrations and is made by casting.

( )19、The carriage can be moved either manually or mechanically by means of the apron and either the feed rod or the lead screw.

( F )20、There is a wide variety of milling cutter shapes. Each of them are

designed to perform effectively a specific milling operation.

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