由于收缩造成的面板张力不断累积，导致裂纹。
When the tension in the top (created by shrinkage) has built up, it eventually releases - and it releases in the form of a crack.
指出裂纹产生的外因是钢水的静压力、热应力、组织收缩应力和其它外力的作用。
It is pointed out that the external causes of cracks originating are effected by static pressure, thermal stress and structural shrinking stress and etc.
指出，拉丝模内孔之所以产生裂纹，是由于压模收缩比太小的原因。
It is indicated the said crack is due to too small shrinkage ratio of the compacting die.
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