When the bead has cooled on the metal sheel transfer it to a mortar and grind to a fine powder .

当球珠已在金属板上冷却，把它转移到一个研钵里，研磨成细粉。

The factors of cold cracking of large porcelain sheel, cracking in temperature circulating test and cracking before warehousing are discussed.

主要讨论了大瓷套冷炸、温度循环试验中炸裂及瓷套经磨削入库后开裂的原因。