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美国Norton公司开发了氧化铝系统磨料的新品种“SG系列”。SG磨料的制法与通常磨料不同,它是烧结超微粒子氧化铝陶瓷,用非熔化法取得所需的粒度。即使在60号的磨料中,也含有1000个以上高纯度超微粒子。在磨削过程中,新的超微粒子接连不断地显露出来,从而使砂轮切削刃仿佛有一种自励作用,能经常保持刃口的锋利度,SG磨粒自身的破碎也形成刃口斜角。 SG磨料(a氧化铝)的纯度高达99.6％,其硬度、锋利度均优于A系列磨料。因此Norton公司的SG砂轮,正被推荐用于硬度为RC67难切削材料的磨削加工以及计算机数控磨削。以SG砂轮磨削涡轮叶片为例,由于切深的增加,作业周期从25分缩短至15分,砂轮每修整一次,可
Norton Company of the United States has developed a new series of “Alumina system abrasive SG series.” SG abrasive material preparation method is different from the usual abrasive, it is sintered ultrafine particle alumina ceramic, non-melting method to obtain the desired particle size. Even in the No. 60 abrasive, also contains more than 1,000 high purity ultrafine particles. In the grinding process, the new ultra-fine particles one after another revealed, so that the wheel cutting edge seems to have a self-excitation effect, can often maintain the sharpness of the edge, SG abrasive grain itself also forms a bevel edge. SG abrasive (a alumina) purity up to 99.6%, its hardness, sharpness are better than the A series of abrasive. Therefore, Norton’s SG grinding wheel is being recommended for grinding of hard-to-cut hard-to-cut RC67 materials as well as for computer-controlled grinding. Take SG wheel grinding turbine blades as an example, due to the increase of cutting depth, the work cycle is shortened from 25 to 15 minutes, the grinding wheel can be trimmed once