A: is the process or technique of reducing wear between surfaces by using a lubricant between the surfaces.
B: is a special liquid that performs three main functions during machining. It lubricates the cutting action, carries off the heat generated, and flushes(冲洗) the chips(切削).
C: is the material being machined. It can be any material and any shape. In the machine shop it usually refers to round or flat pieces of metal ready to be machined.
举一反三
- Generally the function of lubrication is to form of a film of lubricant between any two surfaces that have relative （）， so that surfaces dont get touch with each other.
- The way to reduce （） is to build up a film of lubricant between any two surfaces that rub against each other.
- When machining three different cylindrical surfaces of a stepped shaft with the same turning tool, there are three operation steps, as the cutting parameters have been changed.
- A plastic is a synthetic material which can be molded into any desired shape and which uses an organic substance as a binder.
- Machining is the manufacturing in which the workers can remove the excess material of a part on a machine tool.
内容
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When machining three different cylindrical surfaces of a stepped shaft with the same turning tool, there are three operation steps, as the cutting parameters have been changed. A: 正确 B: 错误
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Which statement about the Lubrication oil is fault? A: The oil absorbs and carries the heat away from the engine components. B: The oil forms a good seal between piston rings and cylinder walls. C: The oil forms a film on the metal surface and prevents a metal to metal contact. D: The oil washes off dirt away from the engine parts through its chemistry.
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The principles for machining sequence of each surface should be( )<br/>and perform rough machining before finish machining. A: perform datum surface machining before that of other surfaces B: perform main functional surface machining before less important surface machining C: perform plane surface machining before hole surface machining D: perform complex surface machining before simple surface machining
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18. The p-value ____ A: can be any negative value. B: can be any positive value. C: must be a number between -1 and 0. D: must be a number between zero and one.
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Fuel is (any) substance or material (that reacts) chemically (with) another substance or material to produce (hot). A: any B: that reacts C: with D: hot