Grinding machine
Date: 2015-10-07; view: 425.
I. Copy the underlined words and word-combinations, translate them into Ukrainian and learn them.
II. Find the following word-combinations in English in the text: послідовним зворотно-поступальним зняттям металу різальним інструментом, що переміщується над деталлю; відносно; малими подачами; плоскі горизонтальні поверхні; хід; контрвал; плоска поверхня; висока продуктивність; стіл, що рухається вперед і назад; поперечка; інструментальні головки; зубчасто-рейковий привод; привод гвинтовими колесами.
A grinding machine is a machine tool used for producing very fine finishes or making very light cuts, using an abrasive wheel as the cutting device. This wheel can be made up of various sizes and types of stones, diamonds or of inorganic materials.
The grinding machine consists of a power driven grinding wheel spinning at the required speed (which is determined by the wheel's diameter and manufacturer's rating, usually by a formula) and a bed with a fixture to guide and hold the workpiece. The grinding head can be controlled to travel across a fixed work piece or the workpiece can be moved whilst the grind head stays in a fixed position.
Grinding machines remove material from the workpiece by abrasion, which can generate substantial amounts of heat; they therefore incorporate a coolant to cool the workpiece so that it does not overheat and go outside its tolerance. In very high-precision grinding machines (most cylindrical and surface grinders) the final grinding stages are usually set up so that they remove about 2/10000mm (less than 1/100000 in) per pass – this generates so little heat that even with no coolant, the temperature rise is negligible.
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