【正文】 ng See how vertical arrangement (including radial and axial from knife from knife), along See how radial array into acute or arranged in the form of the knife. Simple, pact, more applications, but are ringcutter, low utilization of space. Figure a) to c). If the knife storage capacity must be increased to increase the diameter of the knife, then the moment of inertia also increased correspondingly, the election campaign long knife. Tool number not more than 32 general. Cutter was multiloop order of the space utilization knife, but inevitably given the knife from plex institutions, applicable to the restricted space Machine Tool storage capacity and more occasions. Twodisc structure is two smaller capacity knife on both sides of the subspindle place, more pact layout, the number of certificates corresponding increase knife, apply to small and mediumsized processing center. (3) the chain knife Including singleand multiring chain ring chain, chain link can take many forms change, see Figure a) to c), the basic structure shown in Figure 2. 8 do Features: knife apply to the larger capacity of the occasion, the space of the small number of generally applicable to the tool in the 30120. Only increase the length of the chain tool will increase the number should not be increased circumferential speed of its moment of inertia of the knife does not increase the disc as large. (4) linear bination knife and the knife library The linear knife simple structure in Figure , tool single order, the capacity of small knife, used for CNC lathe and drill press on. Because the location of fixed knife, ATC pleted action by the spindle without manipulator. The cutter knife is generally the turret bination turret with a bination of the disc cutter knife and the chain bination. Every single knife the knife certificates of smaller, faster tool change. There are also some intensive drum wheel, and the latticetype magazine for the knife, the knifeintensive though. Small footprint, but because of structural constraints, basically not used for single processing center, the concentration used for FMS for the knife system. Tool storage capacity Tool storage capacity of the first to consider the needs of processing, from the use of point of view, generally 10 to 40 knives, knife will be the utilization of the high, and the structure is pact. Tool options (1) choose to order processing tool according to the order, followed Add to the knife every knife in the Block. Each tool change, the order of rotation of a cutter knife on location, and remove the need knives, has been used by the cutter knife can be returned to the original Block, can also order Add Block, a knife. However, as the knife in the tool in different processes can not be repeated use of the knife must increase the capacity and lower utilization rate. (2) most of the arbitrary choice of the current system of using arbitrary NC election knives, divided into Daotao coding, coding and memorycutter, three. Daotao coding tool code or knives or Daotao need to install the code used to identify, in accordance with the general principle of binary coding coding. Tool knife election coding method uses a special knife handle structure, and each of the coding tool. Each of the tool has its own code, thereby cutting tool can be in different processes repeatedly used, not to replace the tool back at the original knife, the knife capacity can be reduced accordingly. Memoryelection this paper knife, in this way can knives and knife in the position corresponding to the Daotao memory of the PLC in the NC system, no matter which tool on the Inner knife, tool information is always there in mind, PLC . On the knife with position detection devices, will be the location of each Daotao. This tool can be removed and sent back to arbitrary. On the knife is also a mechanical origin, every election, the nearest knife selection. . Control of the knife (1) the knife as a system to control the positioning axis. In the ladder diagram in accordance with the instructions for puting T code parison of the output angle and speed of instructions to the knife the knife servo drive servo motor. Tool storage capacity, rotation speed, and / deceleration time, and other system parameters can be set in such a manner free from any outside influence positioning accurate and reliable but the cost is higher. (2) knife from the hydraulic motor drives, fast / slow the points, with proximity switches count and positioning. In parison ladder diagram of the current storage system knife (knife spindle) and goals knife (preknife) and puting, then output rotation instructions, judging by the shortest path rotation in place. This approach requires sufficient hydraulic power and electromagic valve knife the rotational speed can be adjusted through the throttle. But over time may be oily hydraulic, oil temperature and environmental factors impact the change in velocity and accuracy. Not generally used in large and mediumsized machine tool change frequently. (3) the knife from AC asynchronous motor driven cam mechanism (Markov institutions), with proximity switches count, which means stable operation, and generally accurate and reliable positioning cam used in conjunction with a mechanical hand, ATC fastpositioning. 2. ATC, the main