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在车床上车削退刀槽较窄的螺纹时,不能用高速顺车法切削。若采用低速车削,则容易啃刀,表面粗糙度也差,生产率低。我厂设计了如图所示的机夹正反螺纹车刀,其特点是利用楔块将硬质合金刀头卡紧,用此刀进行反切法高速切削。具体步骤如下:对好刀后,合上开合螺母,用手控制操纵杆,慢速开动机床(正转)。当刀头走到退刀槽处时,即停车,把螺纹车刀进到合适的切深处后,车床主轴即反转启动。切削速度为50～80m/min,刀具向尾座方向前进。照此方法切削数刀后即可加工出高光洁度的螺纹。此刀具可以加工螺距为4mm以下的螺纹,且不受工件直径大小限制(如工件直径过大,可拆去正车刀头)。如将车
When turning a narrow thread of the undercut in the lathe, it can not be cut with the high-speed hand-in-hand method. If the use of low-speed turning, it is easy to chew knife, the surface roughness is poor, low productivity. I plant design as shown in the machine folder positive and negative thread turning tool, which is characterized by the use of wedges carbide head clamping, with this knife anti-cutting high-speed cutting. Specific steps are as follows: Right knife, close the opening and closing nuts, hand control joystick, slow start machine (forward). When the cutter head back to the groove, that is, parking, the thread into the appropriate depth of the knife, the lathe spindle that is reversed start. Cutting speed of 50 ~ 80m / min, the tool forward to the tailstock direction. According to this method can be processed after cutting several knife high-finish thread. The tool can be processed thread pitch 4mm below the thread, and not subject to the size of the workpiece diameter limit (such as the workpiece diameter is too large, removable front cutter head). Such as the car