沖壓專業(yè)外文翻譯-----普通全鋼沖模的沖壓精度分析-文庫吧資料
2025-05-22 15:44本頁面
【正文】 rubs, the manual grid reference rubs gradually filters the continual path grid reference to rub and NC and the CNC continual path grid reference rubs, Processing coarseness may reach 177。, generally all in177。 ~ ,even is smaller. The processing surface roughness Ra value can mu m. According to the recent years to the domestic 12 productionlines cutter factory investigation and study, the domesticallyproduced line cutter processing precision different factory differentmodel line cutter might reach 177。39。39。 and the punching part are punched with progressive die, the gap C=7%t (single edge) , initial accuracy are IT11, and have an more rough surface, even can see the gap with eyes. In the usual situation, flushes a material and its thickness t is theselection punching gap main basis. Once the designation gap haddetermined flushes the plane size the fixed error main body。 and also have another part error are unconventional , unforeseen. Therefore, every die’ s error are posed of fixed error, system error, accident error and so on. 1. fixed error At the whole process when the New punching die between just input production to discard, the changeless master error that in qualified part are called fixed error. It’s magnitude is the deviation when the die production qualified products before the first cutter grinding. Also is the initial error, but the die have initial punching accuracy at this time. Because of the abrade of parts, the die after grinding will be change the dimension error. And the increment of deviation will oversize as the times of cutter grinding. So the punching accuracy after cutter grinding also called “grinding accuracy” and lower tan initial accuracy. The fixed error depend on the elements factor as followed : (1) the material , sorts, structure, (form) dimension, and thick of panel the magnitude of punching gap and degree of homogeneity are have a important effect for the dimension accuracy. Different punching process, material, thick of panel, have pletely different gap and punching accuracy. A gear H62 which made in yellow brass with the same mode number m=, 2mm thick and had a center hole, when the gap get C=%t (single edge) , and punched with pound punching die, and the dimension accuracy reached IT7, the part have a flat surface ,the verticality of tangent plane reached 176。 and before the dies discard, the largest error of the last batch permit, called limiting error. at job site, the evidence to confirm life of sharpening is the higher of the blanking, punched hole or punched parts. Because all finished parts had been blanked ,so it is especially for the pound dies. Therefore, the analyse of burr and measurement is especially important when do them as enterprise standardization or checked with the height of punching part. The initial error usually is the minimal through the whole life of die. Its magnitude depend on the accuracy of manufacture, quality, measure of the punching part, thickness of panel, magnitude of gap and degree of homogeneity. The accuracy of manufacture depend
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