It can be reduced by 56.89% when only the grinding sub-work mode is changed. When only the type of grinding sub is changed, the hardness can be reduced by 56.59%, and the replacement can be reduced by 81.29%;
When only changing the working mode of grinders, the hardness can be reduced by 56.89%, and the hardness can be reduced by 56.59% and 81.29% by changing only the type of grinders;<br>