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目前广泛采用的切断刀、切槽刀和螺纹车刀,特别是用来切狭深环形槽或螺旋槽的车刀,它们不具有高的强度,使用时常损坏。在切削过程中,切断刀的工作部分1（图a）在主切削分力Pz作用下将产生变形,并相对刀夹的边缘A回转,如位置2。主切削刃K此时将沿弧线Q移动。显然,非刚性的车刀工作部分在弯曲时将使车刀自动增大切入毛坯,也就是作用力将增大,从而导致车刀的折断。 新结构的高生产率切断刀可在完成相应工序时提高劳动生产率0.5～1倍,具有防过载自保护特点。 车刀工作部分（图b）做成正方形元件,带4把切削刀片4,并安装在两个支承B和C上。这两个支承在增大力P_（zl）作用下将会产生移动,并使主切削刃K脱离危险区。支承的移动是由刀夹的结构特点和工作部分的夹紧部件特点来保证的。支承B以V方向移动,支承C
Cutting knives, grooving knives and thread turning tools, which are widely used today, are especially used to cut narrow deep annular grooves or spiral grooves in turning tools which do not have high strength and are often damaged during use. During the cutting process, the working part 1 (Fig. A) of the cutting tool will deform under the action of the main cutting component Pz and rotate relative to the edge A of the tool holder, as shown in position 2. The main cutting edge K will now move along arc Q. Obviously, the working part of the non-rigid turning tool will make the turning tool automatically increase and cut into the blank when bending, that is, the force will increase, which will cause the breaking of the turning tool. The new structure of high-productivity cutting knife in the completion of the corresponding processes to improve labor productivity 0.5 to 1 times, with anti-overload self-protection features. The working part of the turning tool (fig. B) is made as a square element with 4 cutting inserts 4 and mounted on two supports B and C. Both bearings will move under the action of increasing force P zz, and will move the main cutting edge K out of the danger zone. The movement of the support is guaranteed by the structural features of the tool holder and the clamping features of the working part. Support B moves in V direction to support C