Main Features and Functions of Numerical Control Milling Machine (Especially named CNC Vertical/Horizontal Machining Center)
Compared with Universal Milling Machine, Main Features of CNC Vertical Machining Center are as follows:
1. Machine parts processing has strong adaptability and good flexibility, which can be processed outline shape special complex product or part size which is difficult to control, such as mold parts, shell parts, etc.;
2. Numerical Control Milling Machine can process the machining the complex parts that universal lathe cannot do, such as the complexity curve described by mathematical model and three-dimensional curved surface parts;
3. Numerical Control Milling Machine can be processed the parts which requires more working procedures after one-time clamping positioning;
4. Machining precision is high and machining quality is stable and reliable, pulse equivalent of CNC equipment is usually 0.001 mm and high accuracy CNC system can reach to 0.1μm. In addition, numerical control processing cannot avoid the error made by operators;
5. Production automation degree is high, which can reduce the labor intensity of operators and is advantageous to the production and management automation;
6. Firstly, production efficiency is higher, CNC milling machines do not need to use special process equipment generally. When replacing workpieces, operators only need to call data stored in in the process of numerical control device, clamping tools and adjusting tool data, thus, it shorten the production cycle greatly.
7. Secondly, CNC milling machine has the function of the milling machine, boring machine and drilling machine, which can make the process highly concentrated, greatly improving the production efficiency. In addition, CNC milling machine spindle speed and feeding speed are stepless, therefore, it is in favor of choosing the best cutting parameter;
Main Functions of Numerical Control Milling Machine
1. Position Control Function
Position control of CNC milling machine is mainly used for machining the hole, such as the center drill positioning, drilling, reaming, counter boring, reaming and bore hole machining operation.
2. Continuous Control Function
Workpiece’s surface and plane are milling by numerical control milling machine of straight line interpolation, arc interpolation or complex curve interpolation.
3. Tool Radius Compensation Function
If program according to the workpiece contour line directly, when machining the interior contour, the actual contour line will be greater than one tool radius value; when machining the exterior contour, the actual contour line will be smaller than one tool radius value. Using tool radius compensation method, the numerical control system calculates tool center path automatically, which makes the cutting tool center deviates from the workpiece contour one toolradius value, thus process an outline of the drawings which can meet the requirements. Taking advantage of the function of tool radius compensation, it also can compensate the cutting tool wear amount and machining error, realizing roughing and finish machining of workpiece.
4. Tool Length Compensation Function
Change the tool length compensation amount, which can compensate length deviation value after tool changing, and also can change the cutting plane position, control of axial positioning precision of the cutting tool.
5. Fixed cycle processing function
The Application of fixed circulation processing instruction can simplify the process and then reduce the workload of programming.
6. Subroutine function
If the processing workpieces’ shape is same or similar, write it as a subroutine, called by the main program, which simplify the structure of program. Refer subroutine function to make machining program modular, and divided into several modules accordingto the processing procedure, write into a subroutine respectively, called by the main program, and finish the machining of workpiece. This kind of modular program is easier for facilitating processing and debugging, and optimizing of process.
