Comparison of advantages and disadvantages of five different tool handles!
January 10, 2022
1、 Spring knife handle
Working principle: use the taper spring jacket to gradually shrink in the process of axial movement (locking) to clamp the cutting tool.
Scope of application: drill bit, reamer, finishing end mill, etc
Features: large clamping range; Good universality; High precision (only for some manufacturers).
Key points: whether the spring jacket can shrink perfectly and evenly is one of the key factors determining the runout accuracy; The bearing nut can greatly reduce the torque to the jacket during locking.
The runout accuracy level of spring jacket at 4D represents 20 μ Ordinary Er jacket within 10 m μ Precision Er jacket within 5m μ Less than 3 m from a few ultra precision manufacturers μ Top high precision NBC jacket within M
2、 Hydraulic tool handle
Working principle: use hydraulic pressure to shrink the inner diameter of the tool handle to clamp the cutting tool.
Scope of application: high precision machining of end milling cutter, cemented carbide bit, diamond reamer, etc.
Comparison of advantages and disadvantages of five different tool handles
Features: it is easy to operate and can be tightened with only one T-wrench. It belongs to the simplest clamping mode among all tool handles; The accuracy is stable, and the tightening force does not directly act on the clamping part, even the new operator can clamp stably; Completely waterproof and dustproof; The anti-interference performance is good. Some slender hydraulic tool handles on the market are comparable to the anti-interference performance of heat shrinkable tool handles.
3、 Heat shrinkable shank
Working principle: clamp the cutting tool by using the difference of thermal expansion coefficient between the tool handle and the cutting tool.
Scope of application: processing occasions requiring high interference conditions.
Features: good anti-interference; The clamping range is small, and only one size of cutting tools can be clamped; The initial runout accuracy is good (it decreases rapidly with the increase of heating times); Special heating and cooling device is required, which has poor safety and high requirements for operators.
4、 Powerful milling cutter shank
Working principle: press the tool handle body to shrink through the nut to clamp the cutting tool.
Scope of application: end mill re cutting.
Features: high rigidity; The clamping force is strong, which is the largest among all clamping tool handles; Poor interference prevention; (some manufacturers have recently introduced a powerful milling cutter shank with an outer diameter of only 32mm for nuts) the runout accuracy is generally below 0.02mm, but some manufacturers have achieved 5 ~ 10 μ m。
Key points: whether the elastic deformation is uniform and whether the shrinkage is sufficient. (the collet thickened design can increase the rigidity and bear the heavy cutting of the end mill.)
Typical case: the powerful milling cutter handle made by Japan's jokho company adopts a very unique slit structure, which can make the chuck deform evenly, with strong clamping force and stable runout accuracy.
5、 Side fixed tool handle
Working principle: as its name, lock the cutting tool through the side fixing screws.
Comparison of advantages and disadvantages of five different tool handles!
Scope of application: for rough machining of drill bits and milling cutters with flattened shank.
Features: simple structure, large clamping force; But the accuracy and universality are poor.
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January 10, 2022
