Common sense of the hottest CNC machining center

2022-08-09
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NC machining center common sense

machining center is a digital control machine tool equipped with a tool magazine, which can automatically change tools and process workpieces in multiple processes

after the workpiece is clamped once, the digital control system can control the machine tool to automatically select and replace tools according to different processes, automatically change the spindle speed and feed rate of the machine tool, and the motion path of the tool relative to the workpiece and other auxiliary functions, and complete the processing of multiple processes on several surfaces of the workpiece in turn

due to the centralized process and automatic tool change, the machining center reduces the time of workpiece clamping, measurement and machine tool adjustment, so that the cutting time of the machine tool reaches about 8O% of the starting time of the machine tool (only 15 ~ 20% for ordinary machine tools); At the same time, it also reduces the time of workpiece turnover, handling and storage between processes, shortens the production cycle, and has obvious economic effects. The machining center is suitable for small and medium-sized batch production with complex part shape, high accuracy requirements and frequent product replacement

the first processing center was first developed by Carney trac company in 1958. It adds an automatic tool change device on the basis of the NC horizontal boring and milling machine, so as to realize the centralized processing of milling, drilling, boring, reaming, tapping and other processes after the workpiece is clamped once

since the 1970s, machining centers have developed rapidly, and there has been a replaceable spindle box machining center, which is equipped with multiple spindle boxes equipped with tools that can be automatically replaced, and can process porous workpieces at the same time

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this form of multi process centralized processing has also been extended to other types of CNC machine tools, such as turning centers. It is equipped with multiple automatic tool change devices on the CNC lathe, which can control more than three coordinates. In addition to turning, the spindle can stop rotating or indexing, while the tool rotates for milling, drilling Foreign enterprises and scientific research institutions are encouraged to set up new material research centers in our province, which have chemical resistance, mechanical resistance and heat stress resistance, and new material scientific and technological achievements incubation bases, and are suitable for processing complex rotating parts

machining centers are divided into vertical and horizontal types according to the layout of the spindle. Horizontal machining centers generally have indexing turntables or CNC turntables, which can process all sides of the workpiece; It can also make joint movement of multiple coordinates to process complex spatial surfaces. Vertical machining centers generally do not have turntables and are only used for top machining. In addition, there are compound machining centers with vertical and horizontal spindles, and vertical and horizontal adjustable machining centers whose spindles can be adjusted into horizontal shafts or vertical shafts, which can process five surfaces of workpieces

The automatic tool change device of the machining center is composed of a tool magazine storing tools and a tool change mechanism. There are many kinds of tool magazine, including disc type and chain type. The chain tool magazine has a large capacity for storing tools

the tool change mechanism exchanges tools between the machine tool spindle and the tool magazine, and the common one is the manipulator; There is also an armless tool changing device that directly exchanges tools with the tool magazine by the spindle without a manipulator

in order to further shorten the non cutting time, some machining centers are equipped with two pallets that automatically exchange workpieces. One is loaded with workpieces and processed on the workbench, while the other is loaded and unloaded outside the workbench. After the machine completes the machining cycle, the pallet is automatically exchanged, so that the loading and unloading time of the workpiece coincides with the cutting time

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