The cutting of the tool depends not only on the tool itself, but also on the use of the machine tool, the connection between the tool and the machine tool, the tool holder system, the tool balance, the tool safety monitoring system, etc., and the tool-related technology is also together with the tool technology. New progress has been made under the advancement of science and technology. CNC machine tools such as tool holder system machining centers for high-speed cutting have always used the traditional 7:24 solid taper shank tool system. Due to the combination of the taper and the taper, the coupling rigidity of the shank and the spindle is lower, and the spindle speed exceeds 10000r/min, the lack of joint rigidity is more obvious. For the tool change with ATC tool holder, the radial dimension of the tool may change after each tool change, and there is a problem of low repeatability. To solve these problems, the standard 7:24 tool holder is mainly improved. Inspired by the HSK tool holder, a new type of coupling technology with a 7:24 tool holder has emerged in recent years. For example, Japan Nikko Co., Ltd. and Dazhaohe have developed three types of contact (3LOCKSYSTEM) and double-sided (BIGPLUS) 7: 24 joint holders. Compared to standard 7:24 shanks, they have higher joint rigidity and precision for high speed, high efficiency cutting and are compatible with existing 7:24 shanks or machine tools, which is a 7:24 shank for the future. In the development direction, in addition to the modification of the standard 7:24 shank structure, the new HSK shank and KM shank are mainly used. The HSK shank is a new type of high-speed tapered shank. The interface adopts the method of simultaneous positioning of the tapered surface and the end surface. The shank is medium-sized and the length of the cone is short, which is beneficial to realize the light-weight and high-speed of the tool change. Due to the use of end face positioning, the axial positioning error is completely eliminated, making high-speed and high-precision machining possible as well as the development direction of tool manufacturing in our domestic manufacturing plants. The connection technology between high-speed tools and spindles will continue to develop with the advancement of technology, and some new concept holders - HSK, KM, 3LOCK, BIGPLUS and other tool holders will be further improved and improved. The current development direction of the spindle and tool connection technology is: (1) Double-sided positioning system; (2) High clamping precision, good clamping rigidity and compact structure; (3) Tool holder with balance and vibration damping device; (4) Develop versatile and intelligent tool holders.
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