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Referred to as CNC machine tool and tool system connected part of the structure of machine tool and tool system interface. Machining centers and CNC boring and milling machine and tool system interface is the main 7:24 taper interface. Due to historical reasons, countries in the initial design of 7:24 taper shank, pulling nail and taper shank end flange structure taper shank end (including manipulator clamping groove, groove and direction identification groove selection) on each are not identical, and formed their own standards, such as: American Standard (ANSI CAT B5.50), German standard (DIN 69871), Japanese standard (BT MAS 403), national standard (ISO) etc.. Taper shank is a very precise machining tool, in the whole cutting process will bear the transmission of rotary motion and torque of the spindle to the important responsibility of the cutting tool, the quality requirements are very strict. Even if the error is very small, will directly affect the final quality of workpiece. As a user, several basic elements to be considered for:
A, coaxial degree theory, the rotation axis of cutting tool and machine tool principal axis coincide in the same line. In addition, clamping ends of the handle, the coaxiality is loading cutting tool parts of the geometric center line and the taper cone center line must be controlled in strict tolerance range.
Two, the clamping force / gripping strength if distinguish according to the method of clamping tool, there are several:
(1) the lateral fixation type vertical milling cutter.
(2) the spring chuck.
(3) heat shrink toolholder.
(4) plane milling cutter.
(5) strong handle is a representation of the CNC roller milling chuck, features such as: handle needle bearing design, by special arrangement, locking resistance small clamping force, heavy cutting will not fall knife. Design of thick wall with inner hole, strong shock absorbing capacity, suitable for heavy cutting. Can be connected to C16, C20, C25, C32, C42 straight shank chuck.
(6) high-speed tool shank in tool system in many developed in Germany HSK (Devin short hollow cone Hole Schaft Kegel abbreviation) tool system is relatively successful. Taper shank HSK employ the positioning end and surface and clamping way of working, the clamping force, HSK shank flange surface and the spindle end close fitting, flange surface plays a supporting role, it prevents the deformation of HSK toolholder, improves the HSK tool system stiffness. Three, the dynamic balance based on the theory of dynamics, the centrifugal force generated by the unbalanced, proportional to the square of the speed. That is to say, generated in the 1000r/min when not worth mentioning and centrifugal force, the speed reaches 10000r/min, the centrifugal force is 100 times of the original, while the rotational speed is 20000r/min, the centrifugal force is 400 times of the original. Therefore, for high speed cutting tool and tool assembly, the dynamic balance is self-evident.
Users in the use of CNC machine tools is another problem that can not be ignored is the cutting parameter setting. The general CNC machine tool spindle speed than common tool of high speed, so the CNC machining tool from the performance than ordinary machine tool more strict. Including the applicability of the tool, cutting tool's strength, hardness and durability of the tool, the tool of these performance will directly influence the selection of cutting parameters. Machining parameters selected low, will reduce the efficiency of production, increase the cost of production, and even difficult to ensure processing quality; on the contrary, the cutting parameters selected high, will accelerate the wear of tools, not only reduced the processing quality, and the grinding time and tool costs increase, will also affect the processing efficiency and production cost, but also improve the cutting force, cutting temperature, so that the processing of vibration, processing condition deterioration. Therefore, in the process of machinery, we must choose suitable cutting parameters, in order to make full use of the cutting performance and the performance of machine tools, in the premise of ensuring the processing quality, as high as possible and productivity and lower production costs, improve economic machining. NC machine tools in the completion of large workpiece cutting, only to choose the reasonable parameters, can we truly achieve low consumption, high efficiency production.
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