CNC milling machine is a kind of CNC machine tool with strong Machining functions. The rapidly developed machining centers and flexible machining units are all based on CNC milling machines and CNC boring machines. Inseparable from the milling method. Because the CNC milling process is the most complex and the technical problems that need to be solved are the most, people have always focused on milling when researching and developing software for CNC systems and automatic programming languages.
The emergence and development of CNC machine tools
With the rapid development of social production and science and technology, mechanical products are becoming more sophisticated and complex, and require frequent modifications, especially for mechanical parts required in aerospace, shipbuilding, military and other fields, with high precision requirements, complex shapes, and batch sizes. Small. Machining such products requires frequent modification or adjustment of equipment, and ordinary machine tools or automated machine tools with a high degree of specialization can no longer meet these requirements. In order to solve the above problems, a new type of machine tool - CNC machine tool came into being. This new type of machine tool has the advantages of strong adaptability, high machining accuracy, stable machining quality and high production efficiency. It comprehensively applies the technical achievements of electronic computer, automatic control, servo drive, precision measurement and new mechanical structure, and is the development direction of CNC machine tools in the future.
The production of CNC machine tools
The world's first successfully developed CNC machine tool is a three-coordinate CNC milling machine. Collaboration. As early as 1948, the United States put forward the initial idea of developing a CNC machine tool when it was developing the task of Machining a machine tool for Machining helicopter blade contour inspection templates. In 1949, with the support of the US Air Force Department, Parsons officially accepted the commission to cooperate with the MIT Servo Mechanism Laboratory and began to engage in the development of CNC machine tools. After three years of research, the world's first experimental prototype of CNC machine tools was successfully trial-produced in 1952. This is a true line interpolation three-coordinate continuous control milling machine using the principle of pulse multiplier. Its control device consists of more than 2,000 electronic tubes, occupying the size of an ordinary laboratory. The birth of this CNC milling machine marks the beginning of the digital control era of mechanical manufacturing.
CNC milling machine Machining
The machined surface shape of milling machine is generally composed of straight lines, arcs or other curves. Ordinary milling machine operators according to the requirements of the drawing. Constantly changing the relative position between the tool and the workpiece, and then coordinating with the selected milling cutter speed, the tool can cut the workpiece, and various shapes of workpieces can be processed.
CNC machining is to divide the motion coordinates of the tool and the workpiece into the smallest unit, that is, the smallest displacement. According to the requirements of the workpiece program, the numerical control system moves each coordinate by several minimum displacements, so as to realize the relative movement of the tool and the workpiece to complete the machining of the parts.
Functional featuresCNC milling has the following features in addition to ordinary milling machine
1. Strong adaptability of parts Machining, Good flexibility, can process parts with particularly complex contours or difficult to control dimensions, such as mold parts, shell parts, etc.; 2. It can process parts that cannot be processed by ordinary machine tools or are difficult to process, such as mathematical Complex curve parts and three-dimensional space surface parts described by the model;
3. It can process parts that need to be processed in multiple processes after one clamping and positioning;
4. High Machining precision, stable and reliable Machining quality , the pulse equivalent of the numerical control device is generally 0.001mm, and the high-precision numerical control system can reach 0.1μm. In addition, the numerical control Machining also avoids the operator's operation errors; 5. The production automation degree is high, which can reduce the operation the labor intensity of the operator. Conducive to production management automation; The tool data is enough, thus greatly shortening the production cycle. Secondly, the CNC milling machine has the functions of milling machine, boring machine and drilling machine, which makes the process highly concentrated and greatly improves the production efficiency. In addition, the spindle speed and feed speed of the CNC milling machine are infinitely variable, so it is beneficial to choose the best cutting amount;