Grinding ball Index definition and calculation method
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Broken ball : means that the broken area exceeds more than one-third of the area of the grinding ball.
Breakage rate = (Qty of broken balls discharged during operation + Qty of broken balls in the mill after shutdown) / (Qty of balls installed at the beginning + Qty of balls added during operation) * 100
Wear calculation of grinding balls (ball mills operate under normal conditions for more than 2000 hours)
Wear Rate = (Qty of balls added at the beginning of operation + Qty of added balls during operation -Qty of available grinding balls cleared) *10³ / Qty of ore processed
Out of round: The roundness rate of grinding ball is tested more than 7% after using 2000h, it is considered out of round. Out of round rate (biased) = (largest diameter - smallest diameter) ÷ average diameter × 100%.
5.磨球体积硬度的计算： 体积硬度=心部硬度+抽条半径四分之一部分+抽条半径二分之一部分+四分之三部分+表面硬度（各点系数相加）。如下： AVH=0.009HRC+0.63HRCCr1/4+0.203HRCr1/2+0.437HRCr3/4+0.289HRC(surface hardness) AVH=Average volume hardness r=½Ф
Formula for calculating the volume hardness of grinding balls : Volume hardness = core hardness + quarter radius of the extracted steel strip + half of the extracted steel strip + three quarters + surface hardness (addition of each point coefficient). as follows:
AVH=0.009HRC+0.63HRCCr1/4+0.203HRCr1/2+0.437HRCr3/4+0.289HRC(surface hardness) AVH=Average volume hardness r=½Ф
Shandong Shengye Grinding Ball Co., Ltd is located in the beautiful city: Zhangqiu District Jinan City. In China, we are a professional factory specializing in the production of forged and hot-rolled balls and alloy steel bars for the mills, with an annual output of 100,000 tons. More than 95% of the products are exported to more than 30 countries, with customers throughout Southeast Asia, Africa and Latin America. And we have a good business cooperation with the big renowned mining companies, cement plants, thermal and chemical power plants in China and worldwide, we have received favorable comments from them.
At present, the company has 10 production lines of forged and automatic hot rolling that are world advanced level, and produce grinding balls with diameters from 15 mm to 200 mm and several steel bars resistant to wear. Given that the company uses advanced technology and automated processes, the entire round bar is uniformly heated at one time to ensure each ball produced is of high quality.