On the characteristics and selection of powerful milling collet chuck

November 12, 2019

In the actual field processing, the powerful milling shank is widely used, which is used by many users as the basic shank. Here are some key points that will not be mentioned in the sample.

(1) about clamping force

It is very difficult to answer the question of "how much kg · m of clamping force is needed at least" (in order not to drop the knife) ".

Tool holder of a powerful milling cutter with a clamping force of 300kg · m as an example, the actual cutting torque of a Φ 32 milling cutter is no more than 60kg · m in practical use. Even if the safety rate is taken into account, 250kg · m is sufficient.

(2) sufficient shrinkage of inner diameter

In practical application, there are many occasions when the handle diameter of the cutting tool is close to the lower tolerance limit and is used with the reducer sleeve. No matter how much clamping force the handle has, only when the gap between the inner wall of the handle and the reducer sleeve, the gap between the reducer sleeve and the handle of the tool is zero, the clamping force will be generated and the tool can be clamped. If the inner wall of the handle 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 for oil film

The size of the groove is very important, too small can not play the effect, too wide will damage the handle of the cutting tool, resulting in problems in the use process. For example, the handle of a tool with a clamping force of 300kg · m bears a pressure of 2ton every 1cm2.

(4) thickness of inner wall

Recently, the handle with inner wall thickness of 10 mm has become the mainstream product, which not only ensures the clamping force, but also enhances the rigidity.

(5) run out accuracy

When improving the cutting parameters, it is easy to focus on the problem of clamping force.

Generally, we all know that in the cutting conditions, the most influential factor is the feed, but we often don't know that the most influential factor is the run out accuracy. In addition, when vibrating the knife, it is easy to think of the rigidity of the handle, but in fact, it is one of the important reasons that the part of the tool vibrates the knife due to the too high jumping accuracy of the handle.

(6) the center part and the port shall be clamped

There is a tendency to decrease the clamping force at the end of the powerful handle of the needle roller locking mode, especially when the small-diameter cutter is clamped with the straight collet jacket.

In order to solve this problem, dazhaohe thinks that it is a better plan to open a proper slit in the depth of the inner diameter of the shank. The slit can make the body part contract evenly, increase the amount of contraction, and improve the accuracy of beating. In other words, it is necessary to set a reasonable slit at the inner diameter of the strong shank to improve the clamping force, the jumping accuracy and the clamping force at the port.

(7) high durability

According to Article 3, the whole body will produce 60Ton pressure after tightening the nut. Long time use will make the needle surface wear. At this time, the life of tool holder should be considered.

The service life of the powerful milling collet chuck in the market is different, and the service life of different brands varies from 1 to 5 times, which requires users to have sufficient discrimination.

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Author:

Mr. jiames.wang

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info@qfmh.com

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8613705473076