CNC machining different tool holders

What does 7:24 in CNC MACHINING BT handle mean? What are the standards of BT, NT, JT, IT, CAT? Nowadays, CNC machine tools are widely used in factories.



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These machines and tools come from all over the world, with different models and standards.VjeYoYike manufacturer company
 

What does 7:24 in BT hilt mean? What are the standards of BT, NT, JT, IT, CAT? Nowadays, CNC machine tools are widely used in factories. These machines and tools come from all over the world, with different models and standards.VjeYoYike manufacturer company

Today, I would like to talk with you about the knowledge of CNC machining center tool holders.VjeYoYike manufacturer company

The tool holder is the connection between the machine tool and the tool. The tool holder is a key link that affects the concentricity and dynamic balance. It must not be regarded as a general component.VjeYoYike manufacturer company

Concentricity can determine whether the cutting amount of each cutting edge part is uniform when the tool rotates once; dynamic imbalance will produce periodic vibration when the spindle rotates.VjeYoYike manufacturer company
VjeYoYike manufacturer company
VjeYoYike manufacturer company
different tool holders for CNC machining
VjeYoYike manufacturer company
 VjeYoYike manufacturer company

1. According to the spindle taper hole, it can be divided into two categoriesVjeYoYike manufacturer company

According to the taper of the tool hole of the CNC machining center spindle, it is usually divided into two categories:VjeYoYike manufacturer company

SK universal holder with 7:24 taperVjeYoYike manufacturer company

HSK vacuum shank with 1:10 taperVjeYoYike manufacturer company

SK universal holder with 7:24 taperVjeYoYike manufacturer company

7:24 refers to the shank taper of 7:24, which is positioned for a separate taper surface, and the taper shank is longer.VjeYoYike manufacturer company

The surface of the cone has two important functions at the same time, namely the precise positioning of the tool holder relative to the spindle and the realization of tool holder clamping.VjeYoYike manufacturer company
VjeYoYike manufacturer company
 VjeYoYike manufacturer company

advantage:VjeYoYike manufacturer company
 VjeYoYike manufacturer company

Without self-locking, the tool can be quickly loaded and unloaded; as long as the taper angle is machined to a high degree of precision in the manufacture of the tool holder, the connection accuracy can be guaranteed, so the cost of the tool holder is relatively low.VjeYoYike manufacturer company
 VjeYoYike manufacturer company

shortcoming:VjeYoYike manufacturer company
 VjeYoYike manufacturer company

When the spindle rotates at high speed, the taper hole at the front end of the spindle will expand. The amount of expansion increases with the increase of the rotation radius and speed, and the taper connection stiffness will decrease. Under the action of the pulling force of the tie rod, the axial displacement of the tool holder will also be changes happened. After each tool change, the radial dimension of the tool holder will change, and there is a problem of unstable repeat positioning accuracy.VjeYoYike manufacturer company
 VjeYoYike manufacturer company

Universal shank with 7:24 taperVjeYoYike manufacturer company
 VjeYoYike manufacturer company

There are generally five standards and specifications:VjeYoYike manufacturer company

1. International Standard IS07388/1 (referred to as IV or IT)VjeYoYike manufacturer company

2. Japanese Standard MAS BT (BT for short)VjeYoYike manufacturer company

3. German standard DIN 2080 type (abbreviated as NT or ST)VjeYoYike manufacturer company

4. American Standard ANSI/ASME (CAT for short)VjeYoYike manufacturer company

5. DIN 69871 type (referred to as JT, DIN, DAT or DV) tightening method:VjeYoYike manufacturer company

The NT type tool holder is used to tighten the tool holder through a pull rod on a traditional machine tool, which is also called ST in China; the other four tool holders are all tightened by the pull stud at the end of the tool holder on the  CNC machining center.VjeYoYike manufacturer company
 VjeYoYike manufacturer company

Versatility:VjeYoYike manufacturer company
 VjeYoYike manufacturer company

1) At present, the two most used tool holders in China are DIN 69871 type (ie JT) and Japanese MAS BT type;VjeYoYike manufacturer company

2) The tool holder of DIN 69871 type can also be installed on the machine tool with ANSI/ASME spindle taper hole;VjeYoYike manufacturer company

3) The tool holder of the international standard IS07388/1 can also be installed on the machine tool of the DIN 69871 type and ANSI/ASME spindle taper hole, so in terms of versatility, the tool holder of the IS07388/1 type is the best.VjeYoYike manufacturer company
 VjeYoYike manufacturer company

HSK vacuum shank with 1:10 taperVjeYoYike manufacturer company
 VjeYoYike manufacturer company

The HSK vacuum tool holder relies on the elastic deformation of the tool holder, not only the 1:10 tapered surface of the tool holder and the 1:10 tapered surface of the machine tool spindle hole, but also the flange surface of the tool holder and the spindle surface are in close contact. The surface contact system is superior to the 7:24 universal tool holder in high-speed machining, connection rigidity and coincidence accuracy.VjeYoYike manufacturer company

HSK vacuum tool holder can improve the rigidity and stability of the system and the product accuracy during high-speed machining, and shorten the time for tool replacement. HSK tool systems are being widely used in aerospace, automotive, precision mold and other manufacturing industries.VjeYoYike manufacturer company
 VjeYoYike manufacturer company

HSK tool holders have various specifications such as A type, B type, C type, D type, E type, F type, etc. Among them, A type, E type and F type are commonly used in machining centers (automatic tool change).VjeYoYike manufacturer company
 VjeYoYike manufacturer company

The biggest difference between Type A and Type E:VjeYoYike manufacturer company
 VjeYoYike manufacturer company

1. Type A has a transmission groove and type E does not. Therefore, the A-type transmission torque is relatively large, and some heavy cutting can be carried out relatively. The torque transmitted by the E-type is relatively small, and only some light cutting can be performed.VjeYoYike manufacturer company
 VjeYoYike manufacturer company

2. In addition to the transmission groove, there are also manual fixing holes and direction grooves on the A-type handle, so the balance is relatively poor. The E type does not, so the E type is more suitable for high-speed machining. The mechanism of E-type and F-type is exactly the same,VjeYoYike manufacturer company
 VjeYoYike manufacturer company

The difference between them is that the E-type and F-type shanks (such as E63 and F63) are called the same, and the taper of the F-type shank is one size smaller. That is to say, the flange diameters of E63 and F63 are both φ63, but the taper size of F63 is only the same as that of E50. So compared to the E63, the F63 will have a faster speed (smaller spindle bearing).VjeYoYike manufacturer company
 VjeYoYike manufacturer company

2. The tool holder is in the form of a spring chuck handleVjeYoYike manufacturer company
 VjeYoYike manufacturer company

It is mainly used for the clamping of straight shank tools and tools such as drills, milling cutters and taps. The elastic deformation of the circlip is 1mm, and the clamping range is 0.5~32mm in diameter. hydraulic chuckVjeYoYike manufacturer company
VjeYoYike manufacturer company
VjeYoYike manufacturer company
CNC milling partsVjeYoYike manufacturer company
VjeYoYike manufacturer company
 VjeYoYike manufacturer company

A-Lock screw, use the Allen wrench to tighten the lock screw;VjeYoYike manufacturer company

B-lock the piston and press the hydraulic medium into the expansion chamber;VjeYoYike manufacturer company

C-expansion chamber, which is squeezed by the liquid to generate pressure;VjeYoYike manufacturer company

D-thin expansion bushing, centering and evenly enveloping the tool clamping rod during the locking process.VjeYoYike manufacturer company

E-special seals to ensure ideal sealing and long service life.VjeYoYike manufacturer company
VjeYoYike manufacturer company
VjeYoYike manufacturer company
Small batch machining services     parts machining servicesVjeYoYike manufacturer company
 VjeYoYike manufacturer company

Heated handleVjeYoYike manufacturer company

Apply induction heating technology to heat the tool clamping part on the tool holder, so that its diameter will expand, and then put the cold tool holder into the hot tool holder. The heating tool holder has large clamping force and good dynamic balance, which is suitable for high-speed machining. High repeat positioning accuracy, generally within 2μm, radial runout within 5μm; good anti-fouling ability, good anti-interference ability in machining. However, each type of tool holder is only suitable for installing a tool with one shank diameter, and a set of heating equipment is required.VjeYoYike manufacturer company





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