Kennametal Electromagnetic Balance System effectively regulates the flatness of the entire rotating system

With the increasing popularity of high-speed machining, tool balancing has become a key issue, which is related to machining efficiency, operational safety and machine tool spindle life.

Commonly used tool balancing methods are: avoiding imbalance from structural design; using the drilling (milling) method to de-weight the shank; attaching a counterweight; setting a radially adjustable balance screw; Adjust the balance ring to balance the tool.

All of these methods have a common problem, that is, they must be used in conjunction with the balancer, which increases the cost of purchasing equipment and requires a considerable balance time; and the balanced object is limited to the components of the tool and the shank, without consideration. The imbalance of the machine tool spindle and the imbalance caused by the dissimilarity of the installation when the tool is loaded into the machine spindle.

In order to overcome the problems of the above balancing methods, it is necessary to propose a new balancing concept and develop a new balancing method. To this end, Kennameta lHertel has introduced an integrated automatic balancing system that uses electromagnetic technology to automatically balance the cutting tool with the machine tool spindle (referred to as the TABS-Total Automatic Balancing System). After entering the machine spindle, it is automatically balanced with the spindle on the machine. When balancing, the tool rotates with the spindle at the working speed, and the entire balancing process takes no more than 2 seconds. This on-board balancing method includes tools, tool holders and machine tools. The balance of the entire rotating system consists of the main shaft.

This balancing method relies on the kennametal/Baadyne electromagnetic balancing system on existing machines and the balance of the entire rotating system with Kennametal Hertel's electromagnetic balancing shank.

Principle and composition of the system

In operation, two sensors that measure vibration are mounted on the outer casing of the machine tool spindle to measure the vibration of the machine tool spindle in two planes. The controller processes the vibration sensor from the spindle housing and the signal from the position of the balance ring on the tool holder. With these three signals, the controller can measure the spindle speed, phase angle and balance ring position and display their values. .

In order to reduce vibration, the controller first performs an automatic balancing procedure: the vibration value measured from the machine spindle is compared with an allowable rating. The controller then sends a pulse signal that transmits the energy to help balance the rotor (balance ring) ) Rotate to the position calculated by the controller; finally, by repeated measurement, comparison and adjustment, gradually approach and finally reach the allowable rating.

The rotatable gimbal on the shank is a two-weighted rotor, and changing the relative position of the two causes the entire imbalance to be corrected. Normally, the two rotors are held in a position by permanent magnets, which can change their position even with very large rotational speed changes or severe vibrations, and their position is changed only under the corresponding program command.

In this system there is also an adjustment frame with a coil ring corresponding to the position of the balance ring of the tool holder, which is equivalent to the stator. When in use, it is mounted on the machine table, within the reach of the machine's spindle stroke, but does not interfere with the machining process and tool change.

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