JINING QINFENG MACHINERY HARDWARE CO.,LTD
JINING QINFENG MACHINERY HARDWARE CO.,LTD
Home> News> Characteristics and selection of powerful milling collet chuck
December 02, 2020

Characteristics and selection of powerful milling collet chuck

(1) On clamping force
For example, for a strong milling cutter shank with clamping force of 300kg · m, the highest actual cutting torque of Φ 32 milling cutter is less than 60kg · m, even if the safety rate is considered, 250kg · m is fully enough.

(2) The inner diameter has enough shrinkage
In practical application, there are many occasions where the shank diameter of cutting tool is close to the lower tolerance limit and fits with the reducing sleeve. No matter how large the clamping force is, the clamping force will be generated only when the clearance between the inner wall of the handle and the reducing sleeve, and the clearance between the reducing sleeve and the handle of the cutting tool are zero, so that the cutting tool can be clamped. If the inner wall of the toolholder does not have a shrinkage of more than 0.1-0.12mm, the clamping force is difficult to reach the nominal value.

(3) The inner wall has a groove to hold the oil film
The size of the groove is very important, too small can not play a role, too wide will cause damage to the handle of the cutting tool, leading to problems in the use process.

(4) Inner wall thickness

The tool handle with inner wall thickness of 10 mm becomes the mainstream product, which not only ensures the clamping force, but also enhances the rigidity.


(5) Runout accuracy
Generally, we all know that the feed is the most important factor affecting the machining efficiency in the cutting conditions, but we often do not know that the most important factor affecting the feed is the runout accuracy. In addition, it is easy to think about the rigidity of the handle when vibration occurs, but in fact, it is also one of the most important reasons for the excessive runout accuracy of the toolholder.


(6) Both the center and the port should be clamped
The clamping force at the end of the strong toolholder tends to weaken, especially when the small diameter cutting tool is clamped with the straight cylinder jacket.


(7) High durability
According to Article 3, after tightening the nut, the overall pressure will be 60Ton. If it is used for a long time, the surface of the needle will be worn. At this time, the service life of the handle should be considered.
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