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Knife clip system: hold high speed rotation Release time：2020-08-12　　　　 Time to browse

　　Blade, round blade, knife, plate shears blade when more than 15000 r/min to the spindle speed of processing, people may find again going to face more problems: unbalanced, the effects of vibration and radial runout quantity expanding, etc., these are all lead to shorten tool life and surface quality, spindle fault caused by the potential adverse factors. Knife clip selection error, for the user undoubtedly means trouble. Now people have to face the fact that machine tools are revving up. Especially the need of automobile lightweight makes the high speed machining of aluminum alloy workpiece more widely used. Manufacturers of engine blocks, power drive system components, and dies and moulds also benefit from the high output of high-speed machining. At the same time, HSM makes lightweight manufacturing a reality and more reliable. For high speed machining, the impact of knife clip on production reliability, machining accuracy and total cost effect is particularly important. The knife clip must be smooth or easily smooth, must have sufficient clamping force, must be sufficient to cope with workshop production and a variety of cutting tools. Tool clamping technology of the latest trend is to use heat shrinkable type clamping structure, using induction or hot air heating when the clamping tool rod hole expansion for cutting tool replacement, and then use the air-filled make tool cooling to room temperature, using tool rod hole and the interference fit of clamping tool diameter, this structure makes the cutting tool in high speed still can maintain reliable clamping performance, especially suitable for the higher speed of high speed milling. The system seems to have a compelling design concept for high-speed machining. Due to their symmetry and lack of moving parts (such as screws), they are inherently balanced, with radial runout between 2.5 ~ 5.0mm or less, and provide considerable clamping force. After Tooling Briney Tooling Systems estimated that the boring bar was rotated at a power of 75kW, the average clamping force provided by the heat-shrinking tool holder to the taper shank was 44.5kN. The company claims its clamping capacity is more than five times greater than that of mechanical or hydraulic jaws. However, the use of heat-shrinkable knife clip is very slow, the reasons for the analysis may be as follows: First, the installation concept of using heat expansion and cold contraction principle is not accepted by people. Some people have no sense of how to clamp the object without using fixed screws or claws. In addition, the contractive taper shank must have a specific taper shank diameter to match. Therefore, it does not seem to be very flexible for tools of different sizes. This is not a major problem in mass production of car parts, however, because the taper shank is usually standard. Although the knife change time can be shortened, and the process takes even less than 30s, some people still hold a negative attitude due to the heating and cooling process. In addition, the cost problem also needs to be considered. The heat-shrinkable clamps cost about 30% more than other clamps and require an induction heating unit, which can cost anywhere from a few thousand dollars to more than $10,000. But all the users who contact the overheat shrink knife clip think that the performance of the heat-shrink knife clip in practice proves that they do have sufficient rationality, no matter the high speed machining or low speed machining its advantages are obvious. This can be seen in comparison with knife clips using hydraulic or other mechanical means. These benefits are ultimately reflected in improved cutting tool life and high speed machining productivity, with faster feed rates and lower tool consumption offsetting the costs associated with the use of heat-shrinkable fixtures.