Ordinary CNC machine tools: Generally speaking, ordinary CNC machine tools refer to automatic machine tools that realize digital control in a machining process, such as CNC milling machines, CNC lathes, CNC drilling machines, CNC grinding machines, CNC gear machining machines, etc.
Machining center: The machining center is a CNC machine tool with a tool magazine and an automatic tool changing device. It integrates the functions of CNC milling machine, CNC boring machine and CNC drilling machine, and most of the machined surfaces of parts can be milled by one-time clamping.
2. Classification of exercise methods
Point-controlled CNC machine tools: This kind of CNC machine tools mainly include CNC drilling machine, CNC coordinate boring machine and CNC punching machine.
CNC machine tools by wire: This kind of CNC machine tools mainly include simple CNC lathes, CNC milling machines and CNC grinders.
Contour control CNC machine tool: Contour control is characterized by continuous and related control of displacement and speed of two or more motion coordinates at the same time.
3. Classification of control modes
Open-loop control CNC machine tools: This kind of machine tools have no position detection feedback device, and usually use stepping motor as the actuator.
Semi-closed-loop control CNC machine tool: install detection elements (such as inductosyn or photoelectric encoder) at the end of motor or screw, and indirectly detect the displacement of moving parts by detecting its rotation angle, and then feed it back to the CNC system.
Closed-loop control CNC machine tools: This kind of CNC machine tools has a position detection feedback device, which adopts linear displacement detection elements and is directly installed on the moving parts of the machine tool, and the measurement results are directly fed back to the CNC device. Through feedback, the transmission error in the whole mechanical transmission chain from the motor to the moving parts of the machine tool can be eliminated, and finally accurate positioning can be realized.
Extended data
Compared with ordinary machine tools, CNC machine tools have the following characteristics:
1, high machining accuracy and stable machining quality;
2, multi-coordinate linkage can be carried out to process parts with complex shapes;
3, processing parts change, generally only need to change the numerical control program, can save production preparation time;
4. The machine tool itself has high precision and rigidity, and can choose favorable processing dosage and high productivity (generally 3~5 times that of ordinary machine tools);
5, the machine tool has a high degree of automation, which can reduce the labor intensity;
6. The quality requirements for operators are higher, and the technical requirements for maintenance personnel are higher.
Baidu encyclopedia-CNC lathe
Baidu Encyclopedia-Introduction to Classification of CNC Machine Tools