In the process of machining precision mechanical parts, turning and milling are the common machining methods, and some common precision parts are milling or turning parts. After rough cutting of the workpiece, the whole workpiece is actually very close to the appearance and size required by the workpiece itself, but at this time, there is still a large margin on the workpiece surface for fine cutting. The surface of the workpiece after fine cutting is smoother and the size will be more accurate.
In general, the workpiece processed by precision machinery parts can reach the required appearance and size of the workpiece after one rough cutting and one fine cutting. However, not all workpieces need only one cut, and some parts of some workpieces may need to be rough cut many times. At the same time, there are also some workpieces whose accuracy requirements are not too high or whose cutting amount is very small, which may only require one finishing cut to meet the requirements of the workpiece.
The rough cutting in the processing of precision mechanical parts requires a larger cutting force than the fine cutting because the workpiece needs a larger cutting allowance. This requires that the machine, the cutter and the workpiece can meet. Moreover, the rough cutting can quickly remove the allowance, and the surface performance after the effect can not be too rough.
The precision cutting of precision mechanical parts processing is to meet the requirements of the workpiece in terms of surface performance and dimensional accuracy. Therefore, the tools used for precision cutting also need to be very sharp. Because of the small cutting amount, the measurement precision is required to be very high.
In fact, there are many parts that we can't see that have an inseparable relationship with the processing of precision mechanical parts, such as the very small nuts in mobile phones. Because these nuts are actually customized according to the needs of mobile phone manufacturers, there are few standards, and the accuracy requirements are very high, almost all of them depend on precision mechanical processing.