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目前,我国机械行业,在粗加工中、低碳钢厚钢板、火割下料的内孔时,习惯采用镗刀。由于火割后的内、外圆偏心4mm左右,内孔表面氧化硬度较高(中碳钢料火割后的内孔加工前需退火)。致使内孔粗镗余量往往需3～4次走刀才能切除。对带深环槽的轴盖类零件(含齿轮端环槽),如图1所示,更给加工带来困难,用镗刀无法加工。若用切刀进行加工,由于受窄深槽空间位置的限制,切刀刀头刚性及强度不足,即使采用手进刀,仍易崩刃,造或刀头弯曲或断裂,工人劳动强度大,生产效率低。下面介绍一种新型硬质合金套料刀,结构如图2所示。此刀适用于C630—1、C3163车床,效果很好。
At present, China’s machinery industry, in roughing, low carbon steel plate, fire cutting the inner hole, the habit of boring knife. As a result of the fire after the cut, the outer eccentric 4mm or so, the inner surface of the hole higher hardness (carbon steel fire cut after the hole before annealing). Resulting in the rough hole boring often take 3 to 4 times to remove the knife. For the shaft cover parts with deep ring groove (including the gear end ring groove), as shown in Figure 1, it brings more difficulties to the processing and can not be processed with the boring tool. If the cutter is used for machining, due to the limitation of the space position of the narrow deep groove, the rigidity and strength of the cutter head are insufficient, even if the hand cutter is used, the cutter is still easy to chipping, the bending or the fracture of the cutter head or the cutter is heavy, Low production efficiency. The following describes a new carbide sleeve knife, the structure shown in Figure 2. This knife is suitable for C630-1, C3163 lathe, the effect is very good.