Regardless of the manufacturer of the steel ball or the mine that uses the steel ball, there is a problem that the steel ball will break during the operation of the ball mill, why is it broken? A fundamental problem is the internal stress:
Simply put, internal stress is a measure of the degree of deformation, strength, impact toughness and other physical quantities related to the work failure of the object; popularly speaking, the internal stress is the internal pressure, let me tell a story here:
In the 1970s, when I first entered the factory, I saw piles of forged workpieces piled up in the open space of the factory. These pieces appeared to have been placed for a long time because they were covered with weeds.
Why are these forged workpieces not processed, and let them go to the sun?
So, I asked a teacher in the workshop. The master told me that this is to eliminate the internal stress of the forging. The forgings are processed by forging hammers, just like kneading dough, but the inside of the dough is a little bit more, there will be less sputum, the internal organization is uneven, and the looseness is inconsistent.
If the forged workpiece is immediately taken to the lathe for processing, the finished dialle and caliper are processed, and the dimensional accuracy is in full compliance with the drawings. However, it is not too long and the dimensional accuracy is unqualified. Where is the problem? The internal stress in the forging has not been completely eliminated, and the "resistance" causes deformation of the workpiece.
The solution is not to rush to process, throw the workpiece aside, and the internal stress is completely eliminated, the internal structure is even, loose and consistent, and then processed, the size of the processed workpiece will not change. From the forgings or steel balls to eliminate internal stress, we have seen some things in daily life. For some things with large "internal stress", don't worry about solving them immediately, but should "coldly handle" and put them aside to let them "eliminate" ", release the energy, adjust the intrinsic, in order to achieve good results.