Why are there machining centers? Definition of machining centers Machining Center (Computerized Numer Ical Control Machine) abbreviated as CNC, is a high-efficiency automated machine tool composed of mechanical equipment and numerical control system used to process complex shaped workpieces. Machining centers are also called computer gongs. The machining center is equipped with a tool magazine with automatic tool change function, which is a CNC machine tool that performs multi-process machining after one clamping of the workpiece. Machining center is a highly mechatronic product, after the workpiece clamping, the numerical control system can control the machine tool according to different processes to automatically select, replace the tool, automatic tool setting, automatically change the spindle speed, feed, etc., can continuously complete drilling, boring, milling, hinge, tapping and other processes, thus greatly reducing the workpiece clamping time, measurement and machine tool adjustment and other auxiliary process time, the processing shape is more complex, the precision requirements are high, the variety of parts with frequent replacement has good economic effects. 
CNC machine tools realize the automation of small and medium-batch processing and improve working conditions. In addition, it also has a series of advantages such as high productivity, stable processing accuracy and low product cost. In order to further exert these advantages, CNC machine tools have developed to "process concentration", that is, CNC machine tools (that is, machining centers) that can complete multi-process processing after clamping parts once. CNC Machining - Why Is There a Machining Center? (Figure 1) Drilling, boring, milling, turning and other single-function CNC machine tools can only complete drilling, boring, milling, turning and other operations separately, and in the machinery manufacturing industry, most parts need multi-process processing. In the entire machining process of single-function CNC machine tools, the time really used for cutting only accounts for about 30%, and most of the rest of the time is spent on installation, adjusting tools, handling, loading and unloading parts and checking machining accuracy and other auxiliary work. In the case that parts need to be processed in a variety of processes, the processing efficiency of single-function CNC machine tools is still not high. Machining centers generally have automatic tool exchange function, and after clamping parts, drilling, boring, milling, countersinking, tapping and other processes can be completed at one time. The purpose of machining centers (1) Workpieces that are repeatedly put into production periodically. The market demand for some products is cyclical and seasonal, and if a special production line is used, the gain is not worth the loss, and the processing efficiency with ordinary equipment is too low, and the quality is unstable, and the quantity is difficult to guarantee. With CNC machining centers, after the trial cutting of the first piece (batch), the program and related production information can be retained, and the next time the product is reproduced, production can be started with very little preparation time. CNC machining center working hours include preparation hours and processing hours, CNC machining center evenly distributes long single piece preparation hours to each workpiece, so that the average actual working hours of each production are reduced, and the production cycle is greatly shortened. (2) High-precision workpiece. Some workpieces are rarely required, but they are key components, requiring high precision and short construction period, using traditional processes to use multiple machine tools to coordinate work, its cycle is long, low efficiency, in the long process process, it is easy to produce waste products due to human influence, resulting in major economic losses. The CNC machining center is used for processing, and the production is completely controlled by the program automatically. It avoids long process flow, reduces hardware investment and human interference, and has the characteristics of high production efficiency and stable quality. (3) Mass-produced workpieces. The flexibility of CNC machining center production is not only reflected in the rapid response to special requirements, but also can quickly achieve mass production to improve market competitiveness. CNC machining centers are suitable for small and medium-sized batch production, especially small batch production, when applying CNC machining centers. Try to make the batch larger than the economic batch to achieve good economic results. With the continuous development of CNC machining centers, the economic batch is getting smaller and smaller, for some complex workpieces, 5-10 pieces can be produced, and even single pieces can also consider using CNC machining centers. (4) Workpieces that can be concentrated in multiple stations and processes. (5) Workpieces with complex shapes. The application of four-axis linkage and five-axis linkage CNC machining center and the maturity and development of CAD/CAM technology have greatly increased the complexity of machining workpieces. The use of DNC makes the processing content of the same program sufficient to meet various processing needs, making the automatic machining of complex workpieces easy. (6) Workpieces that are difficult to measure.
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