Specification of tool spring collet: classification and standard of NC tool handle!

The taper hole of the main shaft in the center is generally divided into two categories, namely the general system with a taper of 7:24 and the HSK straight-air system with a taper of 1:10.

1. There are generally five standards and specifications for the universal tool shank with a taper of 7:24:

NT (Traditional) (NT or ST for short)
DIN 69871 (German Standard) (J, DIN, DAT or DVY for short
IS0 7388/1 (international standard) (IV or IT for short)
MAS BT (Japanese Standard) (BT for short)
ANSI/ASME (American Standard) (CAT for short)

The German standard of NT type tool handle is DIN 2080, which is used to tighten the tool handle on traditional machine tools through pull rods, also known as ST in China. The other four kinds of tool handles are tightened on the machining center by the pull pin at the end of the tool handle. At present, DIN is the most widely used in China

69871 (i.e. JT) and MAS BT handle.
The tool handle of DIN 69871 can be installed on the machine tool of DIN 69871 and ANSI/ASME spindle taper hole, and the tool handle of IS0 7388/1 can be installed on the machine tool of DIN 69871, ISO 7388/1 and ANSI/ASME spindle taper hole, so it is universal.The handle of ISO 7388/1 is the best.

2. 1:10 HSK vacuum knife handle:
The German standard of HSK vacuum tool handle is DIN69873. There are six standards and specifications, namely HSK-A, HSK-B, HSK-C, HSK-D, HSK-F and HSK-F. There are three commonly used ones: HSK-A (automatic tool change with internal cooling), HSK-C (manual tool change with internal cooling) and HSK-E (automatic tool change with internal cooling, high-speed type).

The 7:24 universal tool handle is 7% of the 7:24 conical surface of the tool handle and the spindle hole of the machine tool; 24 Conical contact positioning connection has limitations in high-speed machining, connection rigidity and coincidence accuracy. HSK vacuum tool handle is subject to elastic deformation of the tool handle, which not only contacts the 1:10 conical surface of the tool handle with the 1:10 conical surface of the machine tool spindle hole, but also makes the flange surface of the tool handle closely contact with the spindle surface. This double-sided contact system is superior to the 7:24 universal tool handle in high-speed machining, connection rigidity and coincidence accuracy.