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铜钱中间有方孔是由当时的工艺条件所决定的。古人铸币的时候,先把铜熔化,然后注入模中。但由于古代铸币技术的限制,钱的边缘总有许多毛刺,既不美观又不方便使用。然而,要去掉这些毛刺,就必须靠锉刀加工,一次不能只锉一个;必须把钱穿起来锉才省时省工,而要把钱穿起来,钱中间则必须留有一孔。
There is a square hole in the middle of the coin is determined by the conditions at that time. When the ancients coin, the first melting of copper, and then injected into the mold. However, due to the limitations of ancient coinage technology, there are always many burrs on the edge of money, which are neither beautiful nor convenient to use. However, to get rid of these burrs, you have to work on the file. You can not file one file at a time. You have to put the money on the file to save time and labor, and to put on the money, you must leave a hole in the middle of the money.