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机械专业中英文文献翻译 普通全钢冲模的冲压精度分析
本科毕业设计 (论文)通过答辩
General Allsteel Punching Die’s Punching Accuracy
Accuracy of panel punching part is display the press accuracy of the die exactly.
But the accuracy of any punching parts’ linear dimension and positional accuracy
almost depend on the blanking and blanking accuracy,. So that the compound mould
of compound punching’s accuracy, is typicalness and representation in the majority.
Analyse of the die’s accuracy
For the analyse of pracyicable inaccuracy during production of dies to
inactivation, we could get the tendency when it is augmentation in most time. From
this we could analyse the elements. When the new punch dies pt into production to the
first cutter grinding, the inaccuracy produced called initial error; if the die grinding
more than twenty times, until it’s discard, the inaccuracy called conventional error;
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 compound 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 on the manufacture process. For the 1 mm thicked compound
punching part made in medium steel, the experimental result and productive practice
all prove that the burr of dies which produced by spark cutting are higher 25%~~30%
than produced by grinder ,NC or CNC. The reason is tha
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