CNC Machining Advantages
① The number of tooling is greatly reduced, and complex tooling is not required for processing parts with complex shapes. If you want to change the shape and size of the part, you only need to modify the part processing program, which is suitable for new product development and modification.
② The processing quality is stable, the processing accuracy is high, and the repeat accuracy is high, which is suitable for the processing requirements of the aircraft.
③ The production efficiency is higher in the case of multi-variety and small batch production, which can reduce the time of production preparation, machine tool adjustment and process inspection, and reduce the cutting time due to the use of the best cutting amount.
④It can process complex profiles that are difficult to process by conventional methods, and even process some unobservable processing parts.
The disadvantage of CNC machining is that the cost of machine tools is expensive and requires a high level of maintenance personnel.
In order to improve the degree of production automation, shorten the programming time and reduce the cost of CNC machining, a series of advanced CNC machining technologies have been developed and used in the aerospace industry. For example, computer numerical control, that is, use a small or microcomputer to replace the controller in the numerical control system, and use the software stored in the computer to perform calculation and control functions. This soft-connected computer numerical control system is gradually replacing the initial state of the numerical control system. Direct numerical control uses one computer to directly control multiple numerical control machine tools, which is very suitable for small batch and short cycle production of aircraft.
The ideal control system is an adaptive control system that can continuously change processing parameters. Although the system itself is complex and expensive, it can improve processing efficiency and quality. In addition to the improvement of CNC systems and machine tools in terms of hardware, the development of CNC has another important aspect that is the development of software. Computer-aided programming (also called automatic programming) means that after a programmer writes a program in numerical control language, it is input into the computer for translation, and finally the computer automatically outputs punched tape or tape. The most widely used CNC language is the APT language. It is roughly divided into a main processing program and a post-processing program. The former translates the program written by the programmer to calculate the tool path; the latter compiles the tool path into the part processing program of the CNC machine tool.
