In the production of today's automobile manufacturing industry, the development cycle of new products is continuously shortening, and the cost is constantly decreasing. Data shows that a four-year development cycle was required for automotive products ten years ago; today it only takes two years to complete. In addition to the adoption of advanced new product development methods, virtual manufacturing, synchronous engineering and other advanced development technologies by automobile manufacturers, it is important to benefit from the efforts of equipment suppliers that provide manufacturing equipment for automobile manufacturing, especially these Equipment suppliers provide a variety of CNC lathes, and these CNC lathes allow automobile manufacturers to provide products that meet market needs at the fastest speed.
Classification and characteristics of CNC lathe processing
There are many kinds of CNC lathe processing; from the main category, there are special CNC lathe processing, and there is general CNC lathe processing; from the processing variety, there are CNC lathes for processing shells, CNC milling machines, machining centers, and machining shafts. CNC lathes, turning cores, cam CNC grinders, etc.; from the control requirements of CNC lathe processing, there are single-axis CNC CNC belt polishing machines, five-link CNC gear cutting machines, CNC hob grinding; from the complexity of the control There are simple numerical control and multi-channel numerical control; from the driving mode, there are stepping motors, DC servo motors, AC synchronous servo motors, AC asynchronous servo motors, and linear motors; from the spindle drive mode There are DC spindle motors, AC spindle motors, and AC electric spindles; from the position feedback method, there are fully closed loop feedback, semi-closed loop feedback, open loop control and so on.
CNC lathe processing has good flexibility, high adjustment and high processing accuracy, and has long been concerned by automobile manufacturers. It has entered the field of automobile manufacturing parts production in the 1960s. Because of its high cost, unsatisfactory system function and efficiency, it has not been widely used. Entering the 1990s, with the intensification of market competition; multi-variety production meets the diversified needs of the market to the maximum, until it meets the needs of every CNC lathe processing user, becoming the goal pursued by automobile manufacturers. The flexible manufacturing unit with numerically controlled machine tools as the main body is widely used. There are two key development directions of CNC machine tools today:
High-speed CNC lathe processing achieves high efficiency at high speed. The current international level is that the spindle speed is less than or equal to 25000rpm, the acceleration and deceleration are less than or equal to 2.5g, and the rapid movement is less than or equal to 160m/min. To reach this new level, the drive, mechanical transmission, mechanical structure, and tools of CNC machine tools must be very large. Improve. The main shaft of the machine tool must use an electric spindle. The main bearing generally uses ceramic bearings. The difficulty is cooling and lubrication. The service life is generally 20,000h. The drive generally uses linear motors and linear guides (also with hydrostatic guides), 90m/min, 1g machine tools are also driven by double servo motors with large pitch double ball screw pre-tensioning scheme. The mechanical structure generally adopts a frame box structure. The cutting tool adopts high hardness and high heat resistance cutting tool, and the tool handle adopts HSK counterpart.