Types and characteristics of CNC machine tool holders？

Introduction

In the field of precision machining of CNC machine tools, tool holders are key components that connect tools and machine tools. As a company specializing in CNC machining, we are well aware that different types of tool holders have a profound impact on machining efficiency, precision and quality. Let me introduce you to the common types of CNC machine tool holders and their unique characteristics in detail.

Tool holders are usually divided into two categories according to the taper of the tool hole of the machining center spindle:

1. Universal toolholder with spindle taper 7:24

The 7:24 taper toolholder uses a separate taper surface for positioning, and the taper handle is longer. The taper surface simultaneously performs two functions: positioning the toolholder relative to the spindle center and transmitting torque through tightening force.

Universal toolholder with a taper of 7:24.There are usually five standards and specifications:

(1) International standard IS0 7388-1 (abbreviated as IV or IT)

Features:

High versatility, can be installed on DIN 69871 and ANSI/ASME spindle taper machine tools.

(2) German standard DIN 69871, Chinese standard GB10944

(abbreviated as JT, SK, DIN, DAT or DV)

Features:

The installation dimensions are the same as those of ISO 7388-1 toolholders, but the D4 value is larger, which may cause installation interference.

(3) American Standard ANSI B5.50

Features:

It lacks a wedge notch and cannot be installed on DIN 69871 and ISO 7388-1 machine tools, but the latter two can be installed on it.

(4) Japanese standard JIS B6339, (MAS BT, referred to as BT)

Features:

BT toolholder taper is shorter than the previous three toolholders, and the installation dimensions are different, so they cannot be replaced. The symmetrical structure makes it more stable at high speeds than the other three toolholders.

(5) German standard DIN 2080 (abbreviated as NT or ST)

Tension method: NT type tool holder is tightened by a pull rod on a traditional machine tool, also known as ST in China

2. Tool holder with spindle taper 1:10

(1) HSK toolholder

HSK vacuum toolholders can improve the rigidity and stability of the system and the product precision during high-speed machining, and shorten the tool replacement time, playing an important role in high-speed machining.

HSK toolholders are available in various specifications such as A, B, C, D, E, and F. Among them, A, E, and F are commonly used in machining centers (automatic tool change).

Features: It has a taper of 1:10 and adopts a double-sided contact design (i.e., the taper and the end face are in contact at the same time), providing higher rigidity and precision, especially suitable for high-speed cutting environments.

(2) PSC taper shank (ISO26623)

Uses a short taper design (usually 1:10 taper), but only connects to the spindle through the taper surface contact. Some models may combine end face contact to improve rigidity.

The design goal is to reduce the change in taper surface clearance caused by centrifugal force during high-speed rotation, but its positioning method is simpler than HSK and mainly relies on the friction force of the taper surface.

Conclusion

As a manufacturer of CNC machine tool holders, we are always committed to providing users with high-quality, high-performance tool handle products. Therefore, we continue to optimize product design and enrich product categories to ensure that each tool handle can perform at its best in CNC machining, helping users achieve efficient and accurate machining goals.