Compared with ordinary machine tools, CNC machine tools have the following characteristics:
High machining precision and stable machining quality;
● Multi-coordinate linkage can be carried out to process parts with complex shapes;
● When the machined parts change, it is generally only necessary to change the numerical control program, which can save the production preparation time;
● 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);
The machine tool has a high degree of automation, which can reduce labor intensity;
● Mass production and easy control of product quality;
Low quality requirements for operators and high technical requirements for maintenance personnel.
CNC machine tools generally consist of the following parts:
● The main machine is the main body of the CNC machine tool, including the machine body, columns, spindles, feed mechanisms and other mechanical parts. It is a mechanical component used to complete various cutting processes.
● CNC device is the core of CNC machine tools, including hardware (printed circuit board, CRT display, key box, paper tape reader, etc.). ) and corresponding software are used to input digital parts programs, and complete the storage, data conversion, interpolation operation and various control functions of input information.
● Driving device is the driving part of the executive mechanism of CNC machine tools, including spindle driving unit, feed unit, spindle motor and feed motor, etc. Under the control of numerical control device, he realizes the spindle and feed drive through electric or electro-hydraulic servo system. When multiple feeds are linked, positioning, straight line, plane curve and space curve can be processed.
● Auxiliary equipment refers to some supporting components necessary for the operation of CNC machine tools, such as cooling, chip removal, lubrication, lighting and monitoring. It includes hydraulic and pneumatic devices, a chip removal device, an exchange workbench, a numerical control turntable and a numerical control indexing head, as well as a cutter and a monitoring detection device.
● Programming and other auxiliary equipment can be used to program and store parts outside the machine.
Numerical control molding is widely used in automobiles, especially for some complex precision parts or rough parts that cannot be processed by traditional molding technology, such as matching precision plunger parts and shafts. Figure: CNC workshop for processing auto parts in China.