1, throwing quantity is too large, will not only affect the blasting efficiency, but also affect the performance of casting, resulting in surface hardness is too high, reduce the processing performance;
2, shot blasting is insufficient, the surface quality of the casting can not meet design requirements;
3, the right shot should be thrown into the actual casting casting on the projectile and the weight ratio should be 10----20 times, according to the different proportion of the complexity of the casting, casting the high proportion of complex, sometimes can be as high as 20 - 25 times.
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