铜钟早在原始社会，作为礼器的钟就出现了。当时的钟或以木制，或以竹制，或以陶制，是一种简单的打击乐器。随着青铜文化的开始，在商周时期出现了青铜钟。
As early as in the primitive society, the copper bell appeared as a ritual vessel. At that time, the bell was made of wood, bamboo or pottery. It was a simple percussion instrument. With the beginning of bronze culture, bronze bells appeared in Shang and Zhou Dynasties.
铜钟铸造工艺主要采用倒立造型法，即在造型过程中将铜钟的蒲牢放置在铜钟砂型的底部，铜钟底口砂型在顶部的造型方法，并采用雨淋阶梯式浇注系统，在一定程度上可以起到补缩作用，减小壁厚差引起的凝固时间差，从而减少铸件缩松缩孔缺陷；该工艺相对简便，因铜钟底口的壁厚最厚，壁厚较薄区域能充分得到较厚区域补缩，上层壁厚较厚区域本身凝固较慢，无需放置冷铁，便于实现顺序凝固。减少铸件缩松缩孔缺陷，从而提高铜钟的铸造质量。

The casting process of copper bell mainly adopts inverted moulding method, that is to say, in the moulding process, the Pulao of the copper bell is placed at the bottom of the sand mould of the copper bell, the moulding method of the sand mould of the bottom mouth of the copper bell is at the top, and the step pouring system of rain shower is adopted. To a certain extent, it can play a role of mojulj.37ix.com.cnpeidianfb.37ix.com.cnweilan.37ix.com.cntuoliutacc.37ix.com.cnjiaqiaob.37ix.com.cn

chuweiji.37ix.com.cnfeeding, reduce the solidification time difference caused by the wall thickness difference, thus reducing the shrinkage hole defect of the casting. Therefore, the thickest wall thickness of the bottom mouth of the copper bell can be fully compensated in the thicker wall thickness area. The thicker wall thickness area of the upper layer solidifies slowly, and no chiller is needed to realize sequential solidification. The shrinkage hole defect of the casting is reduced and the casting quality of the copper bell is improved.