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标准系列的圆梳刀螺纹切头(部标GR21-60)用于切制螺距小于4毫米、直径由4～60毫米的外螺纹。加工较大直径的螺纹,可以设计专用的切头。切锥管螺纹和特殊螺纹,可以设计专用的梳刀和卡爪。标准系列的圆梳刀螺纹切头分为两大类:不旋转式切头(GR21-60;编号为10～50)和旋转式切头(GR21-60;编号为100～400。汽车厂沿用旧编为1KA～5KA)。不旋转式切头用于普通六角车床上,在大量流水生产中用得较少,本文亦不介绍了。旋转式切头用于钻床、套丝机、多轴自动车床、组合机床上,在汽车、拖拉机工业中应
The standard series of round comb cutter heads (GR21-60) are used to cut male threads with a pitch of less than 4 mm and a diameter of 4 to 60 mm. Larger diameter thread, you can design a special cutting head. Tapered pipe thread and special thread, you can design a special comb knife and claw. Standard series of round comb cutter thread cutting head is divided into two categories: non-rotary cutting head (GR21-60; No. 10 to 50) and rotary cutting head (GR21-60; No. 100 ~ 400. Old compiled for 1KA ~ 5KA). Non-rotary cutting head for ordinary hexagonal lathe, used in a large amount of running water less used in this article is not introduced. Rotary cutting head for drilling, threading machines, multi-axis automatic lathes, combined machine tools, in the automobile, tractor industry should