内燃机车高速、重载、精密关键性零部件的相互连接,往往需要采用花键连接。因为花键轴和花键槽的本身加工精度要求高,制造工艺也比较杂复,在一般正常的生产情况下,需用专门机床和工具来进行加工,如花键磨床、花键铣床、拉床、压床和拉刀等。但是我厂在试制600马力调车内燃机车时,仅有1959年进厂的一台Y63K花键铣床和一台M8612花键磨床。由于这两台机床规格性能的限制,满足不了生产 Diesel locomotives high-speed, heavy-duty, precision critical components connected to each other, often need to use spline connection. Because the spline shaft and spline groove machining accuracy of their own high requirements, the manufacturing process is also more complex, in the normal production conditions, the need for special machine tools and tools for processing, such as spline grinding machine, spline milling machine, broaching machine, Press and broach. However, when manufacturing a 600 horsepower shunting diesel locomotive, only one Y63K spline milling machine and one M8612 spline grinder entered the factory in 1959. Due to the performance limitations of these two machine tools, can not meet the production