The Performance And Design Basic Research Of HSK-A HIGH-PEED Toolholder

High-speed and ultra-high-speed machining is the inevitable trend of development of the machining industry. A varieties of toolholders has were successfully exploited abroad, a practical high-speed toolholder has not yet developed in our country, performance analysis of some of the typical high-speed toolholders has were analyzed, now the use of high-speed toolholder mainly dependent on imports. In order to obtain the basis of designing HSK-A double-sided positioning high-speed toolholders, the follows were researched: interface radial join stiffnesses, limiting rotational speeds, and the effects of contact pressure of contact surfaces between the spindle and the main dimensions of toolholders to the performance of spindle toolholder connection system.The qualities and radiuses of center of gravity of elastic clamping jaws were determined. The theoretical calculation model of the limiting rotational speed and finite element model were established, the limiting rotational speed was calculated, and the law of distribution was researched. It is testified, by means of comparing results of FEA with the given, that the method of determining the qualities and radiuses of center of gravity of elastic clamping jaw was feasible.The variation of stiffness with bending moment changes was analyzed by changing the patterns of contact such as cone contact, end face contact and double-sided contact, the effects of different patterns of contact to the performance of radical stiffnesses were researched, the interface radial stiffnesses of HSK-A toolholder were obtained and the law of distribution also was analyzed. It is testified, by means of comparing results of FEA and the given, that the stiffnesses of HSK-A toolholder were credible. The law of distribution of the contact pressure of contact cone and contact end face was analyzed, the new definition of the limiting rotational speeds and the basis of designing tensile forces of clamping mechanisms were presented.The HSK-A50toolholder was took as researching object, the effects of main dimensions of toolholder to interface radical stiffness and limiting rotational speed were analyzed by finite element analysis(FEA), the basis of designing main dimensions of toolholder was presented in detail.The results can be used as basis and instruction for design of a new double-sided positioning high-speed toolholder.