混合料大小批研磨效率差异的影响因素研究

Research on Influencing Factors of Grinding Efficiency Difference between Mass Production and Small Batch Experiment of the Mixtures

采用与大批生产相同的WC和Co原料进行YG类硬质合金ZD10制备的小批试验,通过金相组织观察及截线法分析大小批料生产合金的粒度,并对大小批硬质合金的矫顽磁力和钴磁进行检测。对比了大小批料的研磨效率,并分析了大小批研磨效率差异的影响因素。相同球磨工艺条件下球磨24h后,小批料的研磨效率更高,其HCP值比大批料平均高出0.025(kA/m)/h;小批料球磨18h与大批料球磨24h的研磨效率相当;将大批生产的球磨时间确定在24h,各批次合金的矫顽磁力平均值为11.36kA/m,正好是内控标准(10.4~12kA/m)的中间值,能够满足用户的需求。合金棒填充系数、磨筒转速、磨筒内部构造等均是大小批料研磨效率差异的影响因素。

A small batch of YG-type cemented carbide ZD10 was prepared using the same WC and Co raw materials as mass production. The grain sizes of the alloys produced by mass production and small batch were analyzed by metallograpbic microstructure observation and cross-section method, and their coercive force and cobalt magnetism were also detected. The grinding efficiency of large and small batches was com- pared, and the factors were analyzed influencing the grinding efficiency difference between large and small batches. After grinding for 24 h with the same grinding process, the grinding efficiency of the small batch is higher,its average HCP value is 0. 025 （kA/m）/h higher than that of the large batch. The grinding effi- ciency is comparable between grinding for 18 h of the small batch and grinding for 24 h of the large batch. When the grinding time for mass production is determined at 24 h,the average coercive force of each batch of the alloy is 11.36 kA/m,which is exactly the median value of the internal control standard （10.4~12 kA/m） and can meet the needs of users. All the filling coefficient of alloy rods,rotating speed of mill barrel and internal structure of mill barrel are influencing factors of grinding efficiency difference between large and small batches.