The operation and monitoring of CNC machine tools are all completed in this CNC unit, which is the brain of CNC machine tools. Compared with ordinary machine tools, CNC machine tools have the following characteristics:
1. It has strong adaptability to the processing object, adapts to the characteristics of single piece production of products such as molds, and provides a suitable processing method for mold manufacturing;
2. High processing precision and stable processing quality;
3. Multi coordinate linkage can be carried out, and parts with complex shapes can be processed;
4. When machining parts are changed, it is generally only necessary to change the NC program, which can save production preparation time;
5. The machine tool itself has high precision and rigidity. It can choose favorable processing amount and has high productivity (generally 3~5 times that of ordinary machine tools);
6. High degree of automation of machine tools can reduce labor intensity;
7. It is conducive to the modernization of production management. CNC machine tools use digital information and standard code to process and transfer information, and use computer control methods, which lays a foundation for the integration of computer-aided design, manufacturing and management;
8. The requirements for the quality of operators are higher, and the technical requirements for maintenance personnel are higher;
9. High reliability.
Compared with traditional machine tools, CNC machine tools have the following characteristics.
1. Highly flexible
Machining parts on CNC machine tools mainly depends on the processing program. Unlike ordinary machine tools, it is unnecessary to manufacture, replace many molds and fixtures, and do not need to readjust the machine tools frequently. Therefore, the CNC machine tool is suitable for the occasion where the processed parts are frequently replaced, that is, it is suitable for the production of single piece and small batch products and the development of new products, thus shortening the production preparation cycle and saving the cost of a large number of process equipment.
2. High machining accuracy
The machining accuracy of CNC machine tools can generally reach 0.05-0.1MM. CNC machine tools are controlled in the form of digital signals. Every time the CNC device outputs a pulse signal, the moving parts of the machine tool move a pulse equivalent (generally 0.001MM). In addition, the reverse clearance of the machine tool's feed transmission chain and the average error of the screw pitch can be compensated by the CNC device. Therefore, the positioning accuracy of CNC machine tools is relatively high.
3. Stable and reliable processing quality
When machining the same batch of parts, using the same tool and processing program on the same machine tool under the same processing conditions, the tool path is identical, the parts are consistent, and the quality is stable.
4. High productivity
CNC machine tools can effectively reduce the processing time and auxiliary time of parts. The spindle sound speed of CNC machine tools has a wide range of five axis linkage machining centers and feed rates, allowing the machine tools to cut with large cutting amounts. CNC machine tools are entering the era of high-speed machining. The rapid movement and positioning of moving parts of CNC machine tools and high-speed cutting have improved productivity. In addition, it can be used together with the tool magazine of the machining center to realize continuous processing of multiple processes on a single machine tool, reduce the turnover time between processes of semi-finished products, and improve the productivity.
5. Improve working conditions
The CNC machine tool is adjusted before processing, input the program and start it, and the machine tool can automatically and continuously process until the end of processing. The operator only needs to input and edit programs, load and unload parts, prepare tools, observe processing conditions, inspect parts, etc. The labor intensity is greatly reduced, and the labor of machine tool operators tends to be intelligent. In addition, the machine tool is generally combined, which is clean and safe.
6. Utilize modernization of production management
The processing time of CNC machine tools can be estimated in advance. The tools and fixtures used can be standardized and managed in a modern way. It is easy to realize the standardization of processing information. It has been organically combined with computer aided design and manufacturing (CAD/CAM), which is the basis of modern integrated manufacturing technology.