CNC is an efficient automatic machine tool, which consists of two parts: mechanical equipment and numerical control system, and is suitable for the processing of complex parts. CNC is one of the most widely produced and used CNC machine tools in the world. The CNC machining center has strong comprehensive processing ability. After the workpiece is clamped at one time, more processing contents can be completed, and the processing accuracy is higher. For medium and difficult batch workpieces, the efficiency can reach 5~10 times that of ordinary equipment. Many processing that cannot be completed by ordinary equipment is more suitable for single processing or small batch and multi-variety production with complex shape and high precision requirements.
Generally speaking, IT6 is an important matching index widely used in machining, which is divided according to the international precision tolerance. IT6 means that the mating surface has high uniformity requirements, which can ensure a relatively high mating performance, and is stable and reliable in use. The machining center can complete multiple processes such as drilling, milling, boring, expanding, reaming, and tapping.
Drilling is an important process of machining centers. Drilling is the basic method of machining holes. Generally, drilling is performed on drilling machines and lathes. Some of them have relatively high precision requirements, and they can also be completed by machining centers. The drilling accuracy is not high, generally only 12.5~6.3μm, and the surface roughness of the workpiece is generally only 12.5~6.3μm, but the subsequent semi-finishing and finishing are generally completed by reaming and reaming.
Milling is the most important processing procedure in a machining center. It can be said that all machining in a machining center is performed with milling cutters. Milling can be divided into up milling and down milling according to the feed rate. Cutting workpieces with a rotary multi-blade tool is an efficient and common machining method. It is used to process curved surfaces of various complex shapes such as planes and grooves, such as curved molds. The workpiece processed with this tolerance precision has a surface roughness between 0.63 and 5 microns, and the precision milling precision tolerance can generally reach IT16-IT8 level.
Boring is usually used for inner diameter machining. A machining method that uses a tool to enlarge the hole diameter or to trim the circumferential profile, usually used to convert semi-roughing to finishing. For steel structural parts, the boring accuracy error level can reach IT9-IT7, and the surface roughness is 2.5~0.16 microns.
The existing machining process requires the highest grinding accuracy and the smallest tolerance. Punching machine, die casting and other stations can be high, mastering the precision tolerance of each process can make the CNC machining center play a good role. For different industries, the accuracy levels for different products are also different. As a practitioner and manufacturer, we must understand and pay attention to the actual needs of user products, such as medical care, auto parts, etc., and the accuracy requirements for product accuracy and appearance parts are higher.
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