A brief introduction to the standard of taper shank for CNC tools

The national standard GB 10945-89 "7:24 taper tool shank for automatic tool change machine tool No. 40, 45 and 50 taper shank pull nails" is formulated by referring to the international standard ISO 7388 / 2-1984, with the same overall dimension, and is divided into two types: type A and type B: the angle of tension surface of type a pull nail is 15 °, which is used for the tension device without steel ball, code is "LDA"; type B The inclined angle of the tension surface of the V-type rivet is 45 °, which is used for the tension device with steel ball, and the code is "LDB". Both have through holes for coolant flow. German standard DIN 6988-1987 has two types of pull pins: type A and type B, type A with through hole; type B without through hole, but with ring groove for sealing ring to prevent coolant leakage from the tail. The inclined angle of the tension surface of the two kinds of pull nails is 15 °, which is used for the tension device without steel ball.

The Japanese Standard JIS B 6339:1998 has only one type of pull pin. The angle of tension surface of the pull pin is 15 °, which is used for the tension device without steel ball. The code is "xxp". There are two types of rivets in the standard mas-403 issued by Japan Working Machinery Industry Association: type I and type II: the angle of tension surface of type I is 30 ° for the tension device without steel ball; type II is 45 ° for the tension device with steel ball. When using, it should be noted that the head length of these two kinds of rivets is smaller than that of JIS B 6339:1998 standard, and the neck length is longer. Its code is "pxxt". There is only one type of rivet in AMSE b5.50-1994. The angle of tension surface of the rivet is 45 °, and there is no centering cylinder between the flange and the thread. The thread shall be UNC system thread. For the convenience of users, the domestic manufacturer also changes it to the corresponding metric thread, and other dimensions remain unchanged. 1: The international standard ISO 12164-1:2001 of hollow short taper shank basically adopts the scheme of German standard DIN 69873-1. The main difference is that the taper of the shank is 1:10 It is changed to 1:9.98 to ensure that the large end diameter is contacted first when the taper handle is matched with the mounting hole; only the theoretical correct size of the large end diameter is specified, and the large and small end diameters and their tolerances are cancelled; the distance size between the large and small end diameters is cancelled; the marking method of the key groove fillet at the tail end is changed; the type and size of the empty cutter groove between the taper handle and the flange end face are specified in the normative appendix; The balancing area is suggested in the informative appendix. Unfortunately, taper tolerance and big end diameter tolerance of taper shank are not specified. It can be divided into type A and type C: type A is used for automatic or manual tool change; type C can only be used for manual tool change. Due to the double positioning of cone and end face, the axial and radial positioning accuracy is high; the friction transmission torque between the key at the end and cone and end face is large; the taper shank is short in length, light in weight and fast in tool changing; because it is suitable for the use of high-speed machine tools, it is rapidly promoted