Mori Seiki Co., Ltd. has developed the "NT4250 DCG/1500SZ", a multi-tasking machine that suppresses the chattering of the workpiece due to rotation, and was "2006 Chicago International Machinery" held in Chicago, USA from September 6th to 13th, 2006. The Manufacturing Technology (Machine Tool) Exhibition (IMTS2006) was presented. The machining center (MC) is used as a prototype, equipped with a boring machine function for rotating the workpiece in the horizontal direction. The automatic balancer mechanism is respectively arranged on the left and right spindles of the boring machine for fixing and rotating the workpiece (the workpiece spindle), thereby being controllable The flutter caused by the rotation of the workpiece allows the customer to cut the workpiece under high speed conditions and improve the processing efficiency.
Normally, the trampoline rotates with a cylindrical or cylindrical workpiece. Since such a workpiece is not eccentric, chattering does not occur even at high speed. However, some customers have reported that in the turning of a compound machine tool, since an eccentric and complicated workpiece is often fixed, if the workpiece is rotated at a high speed, chattering occurs, and high-precision machining cannot be completed.
In order to solve the above problems, the company adopted an automatic balancer mechanism - "Adaptive Balancer". The mechanism consists of a rotor that rotates like a motor and a stepper with a tangled wire, and an acceleration sensor is mounted on the outside. There are two rings with counterweights in the rotor, and the counterweights are biased in each ring. The flutter is controlled by counteracting the eccentricity of the workpiece by the counterbalance generated by the phase changes of the two rings.
The role of the stepper is to change the phase of the loop. A permanent magnet is embedded in the rotor along the circumference. When the accelerometer detects flutter, the entanglement of the stepper generates a current that creates a magnetic field that attracts the permanent magnet. This controls the phase of the loop.
At present, it is generally adjusted by the operator, and the eccentricity is offset by installing a special counterweight. But this approach is time consuming and laborious. In addition, although the chattering can be reduced by reducing the workpiece rotation speed, the machining efficiency is lowered.
The automatic balancer mechanism automates the operation of suppressing chatter and quickly reduces chattering in seconds. Moreover, it is not necessary to reduce the number of revolutions, so the machining efficiency does not decrease.
The company will sell the automatic balancer mechanism as an optional feature. The price is "about 20,000 US dollars, which is being discussed."
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