What Are The Advantages And Disadvantages Of Cnc Machining

[Grayce Bird]

advantages of CNC machining center:

● high machining precision and high machining quality
● it can carry out multi coordinate linkage and process parts with complex shapes
● when processing parts are changed, generally only the NC program needs to be changed, which can save production preparation time
● the machine tool itself has high precision and rigidity. It can choose favorable processing consumption and high productivity (generally 3 ~ 5 times that of ordinary machine tools)
● the machine tool has a high degree of automation, which can reduce the labor intensity
the disadvantages of CNC machining center are as follows:

● lower requirements for the quality of operators and higher technical requirements for maintenance personnel
● however, its processing route is not easy to control and is not as intuitive as ordinary machine tools
● inconvenient maintenance and high technical requirements;

CNC machining has the following advantages:

① greatly reduce the number of tooling, and complex tooling is not required for machining parts with complex shape. If you want to change the shape and size of parts, you only need to modify the part processing program, which is suitable for new product development and modification
② stable processing quality, high processing precision and high repetition precision, which can meet the processing requirements of aircraft
③ in the case of multi variety and small batch production, the production efficiency is high, which can reduce the time of production preparation, machine tool adjustment milling operation and process inspection, and reduce the cutting time due to the use of the best cutting amount
④ it can process complex surfaces that are difficult to be processed by conventional methods, and even process some processing parts that cannot be observed
the disadvantage of NC machining is that the cost of machine tool equipment is expensive, and the maintenance personnel are required to have a high level
CNC machining is also called NC machining

before programming, the process analysis of the machined parts should be carried out, the machining scheme should be formulated, the appropriate cutting tools should be selected and the cutting parameters should be determined. In programming, some process problems such as tool setting point and processing route also need to be handled. Therefore, process analysis in programming is very important. When processing parts on ordinary machine tools, the operating procedures of each process are specified by process regulations or process cards, and the operator processes parts according to the steps specified in the process cards. When machining parts on NC machine tools, it is necessary to program all the process, process parameters and displacement data to control the machining of machine tools. The machining process of NC machine tools is basically the same as that of ordinary machine tools in principle, but the whole process of NC machining is automatic, so it has its own characteristics:

1. The content of processes is complex

this is because NC machine tools are more expensive than ordinary machine tools. If only processing simple processes is not cost-effective in economy, more complex processes are usually arranged on NC machine tools, and even processes that are difficult to be completed on ordinary machine tools
2. The arrangement of work steps is more detailed

this is because the problems that do not need to be considered in the processing technology of ordinary machine tools, such as the arrangement of work steps in the process, the determination of tool setting point, tool change point and processing route, can not be ignored when compiling the processing technology of NC machine tools
3. Complete all technological processes by relying on procedures
4. NC machining program is the mandatory document of NC machine tool
5. CNC machine tools are controlled by program instructions, and the whole process of machining is carried out automatically according to program instructions
6. NC machining program includes not only the process of parts, but also the process parameters necessary to complete the process, such as cutting parameters, feed route, tool size number and the motion process of machine tool
7. CNC machining has high efficiency, high machining accuracy, low labor intensity and strong adaptability to different workpieces.