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我县一年四季温差较大,气温可在±30℃的范围内变化。但一年四季都要修理拖拉机,有冬季修的,也有夏季修的;有在室内修的,也有在室外修的;有时大件在室外修,小件在屋里修。零件有在室内测量的,也有在室外测量的;有时冬天把大件放在室外测量,小件拿到室内测量,也就是说把偶件分开在两个温度条件下进行测量。例如,把活塞连杆组拿到屋里测量,把缸套和曲轴放在室外温度很低的库内测量。应当指出,零件的标准尺寸是20℃时的测量值。由于金属热胀冷缩的性质,偏离这一温度的测量结果,不是
The temperature difference in all the year round in our county is large, and the temperature can vary within ± 30 ℃. But all tractors must be repaired throughout the year, in winter and in summer. There are interior and exterior fixtures; sometimes bulky outdoor fixtures and small fixtures in the house. Parts are measured indoors, but also outdoors; sometimes in winter, large pieces are placed outdoors and small pieces are taken indoors, meaning that the parts are measured separately at two temperatures. For example, take the piston rod group to measure in the house, put the cylinder liner and crankshaft in the storehouse that the outdoor temperature is very low and measure. It should be noted that the standard part size is measured at 20 ° C. Due to the nature of metal thermal expansion and contraction, deviation from the measurement of this temperature, not