The concept of CNC machining is CNC machining, refers to the CNC machine tools for processing a part of the process, CNC machine tool processing and traditional machine tool processing procedures are generally consistent, but also a significant change. Digital information control parts and tool displacement of the mechanical processing method.It is to solve the variety of parts varied, small batch, complex shape, high precision and achieve efficient and automated processing of effective ways.
Features The main features of CNC machining are as follows:
1, can complete the processing of complex parts, compared with the traditional processing methods, CNC machining can be completed with very complex shape of the parts processing, processing capacity to produce a qualitative leap.
2, high precision machining, CNC machine tool itself because of the high precision in the processing and without manual manual operation, all the operation automatically, thus greatly reducing the human error; In addition, the data machine processing, the general one can be completed All the processing, reduce the number of clamping parts of the workpiece, so the processing accuracy has greatly improved, the parts of the high repeatability, interchangeability, and ensure product quality.
3, reduce the cost of ancillary costs, the use of CNC machining can greatly improve the product pass rate. Waste reduction rate greatly reduced, it can significantly reduce the consumption of tools and tools and storage costs; In addition, the NC processing for a clamping Can be processed until finished, while reducing labor intensity, but also reduce the labor costs and capital occupation; Moreover, the use of CNC machining, can greatly reduce the stock of parts, reduce the number of handling.
4, the production efficiency, CNC machining can be closely linked with the CAD, CAD directly from the geometric model to produce instructions, no need to draw the pattern, thus saving a lot of time, in addition, it is completely automatic processing according to the program, , The knife, tool change, until the parts processing is completed, save a lot of auxiliary time; Third, in the NC processing, the computer chooses the best cutting speed, much better than the manual selection, processing time greatly shortened by the above analysis It can be seen that the high efficiency of NC machining is obvious.
5, can quickly convert product processing, due to CAM and CAD directly connected to the CAD program changes, will make the NC processing immediately have a corresponding change, you can quickly convert product processing, production preparation cycle is short, can save a lot of special technology and equipment, To adapt to the needs of rapid product replacement.
Advantages and disadvantages NC machining has the following advantages:
1, a large number of tooling to reduce the number of processing complex parts do not need complex tooling.To change the shape and size of parts, only need to modify the parts processing procedures for new product development and modification.
2, processing quality and stability, high precision, repeat the high precision, to meet the processing requirements of the aircraft.
3, multi-species, small batch production under the conditions of high production efficiency, can reduce production preparation, machine adjustment and process inspection time, and because the use of the best cutting the amount of cutting time.
4, can be processed conventional methods difficult to process the complex surface, and even processing some of the processing can not be observed parts.
The drawback of CNC machining is that machine equipment is expensive and requires a higher level of maintenance personnel.
Development In order to improve the degree of production automation, shorten the programming time and reduce the cost of CNC machining, in the aerospace industry has also developed and used a series of advanced CNC machining technology, such as computer numerical control, that is, small or microcomputer instead of CNC control Device
, And use the software stored in the computer to perform the calculation and control functions, this soft-connected computer numerical control system is gradually replacing the initial state of the numerical control system.
Direct control is a computer directly control multiple CNC machine tools, it is suitable for small batch short-cycle production of the aircraft.The ideal control system can be continuously changed the processing parameters of the adaptive control system, although the system itself is very complex and expensive, But can improve processing efficiency and quality.
CNC development In addition to the hardware aspects of the CNC system and machine tools to improve, there is another important aspect is the development of software.Computer-assisted programming (also known as automatic programming) is written by the programmer in a numerical language to write it Input to the computer for translation, and finally by the computer automatically output perforation tape or tape. The use of a wide range of CNC language is APT language. It is roughly divided into the main processing procedures and post-processing procedures. The former programmer to write the program Translation, calculate the tool path; the latter to the tool path into NC machine parts processing program.

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