Online restraining method for milling chatter

Abstract

The invention relates to an online restraining method for milling chatter. A data acquiring and processing module comprises a clamping plate arranged at the lower end of a machine tool main shaft, a first capacitance type displacement sensor, a second capacitance type displacement sensor, an acquirer and a data analyzer; the first capacitance type displacement sensor and the second capacitance type displacement sensor are symmetrically arranged at the lower end of the clamping plate, and are connected with the acquirer; and the acquirer is connected with the data analyzer. According to the online restraining method for milling chatter, a way of combining a controller with electromagnetic induction coils is adopted for inhibiting milling chatter, and magnetic field intensity is controlled through current size, so that damping of the whole process system is controlled, and complete closed-loop feedback is formed. The device is high in universality, and is conveniently mounted on different machine tool main shafts, so that a processing process is more stable, and processing precision is effectively guaranteed.

Description

technical field [0001] The invention relates to the field of mechanical manufacturing, in particular to an online suppression method for milling chatter. Background technique [0002] With the development of five-axis machining technology, milling has become more and more widely used in aviation, aerospace, automobile manufacturing and other fields. Especially for the processing of complex thin-walled parts, milling is an indispensable processing method. Chatter is a self-excited vibration that can have many negative effects during milling. For example, reduce the surface quality of the workpiece, accelerate tool wear and generate excessive noise. Therefore, how to suppress chatter during milling has become the research focus of machining. Machine tool vibration reduction methods are usually divided into two categories, one is passive vibration control, and the other is active vibration control. Passive control mainly uses the structure of the system itself to consume fl...

AI Technical Summary

Problems solved by technology

A Chinese patent discloses "an active control method for milling chatter vibration based on a magnetic bearing electric spindle" (application number: CN201410805910.7, publication number: CN104647132A). This technology uses a magnetic suspension bearing electric spindle to suppress milling chatter, and the device is too complicated , it is easy to cause coupling, which is not conducive to the real-time transmission of control, and will also increase the cost

This method uses a voice coil motor as the actuator for chatter suppression. Although this method has a large output force and is easy to control, this method directly arranges the sensor, voice coil motor, etc. on the workbench, which is not suitable for the occasion where cutting fluid is used.

Both of the above two methods directly use the collected displacement signal as the basis for judging whether chatter occurs, and accidental factors in the processing process (such as tool chipping, cutting into the winning mass, etc.) are likely to cause misjudgment, thereby affecting the machining accuracy of the workpiece

Images