Device and method for monitoring tool state in cutting process and chip formation

Abstract

The invention discloses a device and a method for monitoring the tool state in a cutting process and chip formation. The device comprises a tool and an AE signal collector which are mounted on a toolholder, a workpiece, a test platform and a data acquisition system, wherein the tool holder includes a main clamp holder, a sub-clamp-holder and a heat-insulating damping pad, the tool and the heat-insulating damping pad are arranged side by side between the main clamp holder and the sub-clamp-holder, the sub-clamp-holder is locked on the main clamp holder in the forward direction through connecting bolts penetrating through the heat-insulating damping pad, the sub-clamp-holder reversely and tightly abuts against the main clamp holder through an adjusting bolt, and the AE signal collector is mounted on the sub-clamp-holder; and a first piezoelectric force transducer is arranged on the flank surface of the tool, a second piezoelectric force transducer is arranged on the rake face of the tool, a surface strain meter is mounted on the main clamp holder, and a high speed CCD camera is mounted above the tool. According to the device and the method for monitoring the tool state in the cutting process and the chip formation, AE signal has high acquisition precision, good independence and high relevance.

Description

technical field [0001] The invention relates to the technical field of machining, in particular to a device and method for monitoring the state of a tool in cutting and chip formation. Background technique [0002] High-speed cutting is an advanced manufacturing process much higher than conventional cutting speed. It can not only greatly improve the processing efficiency of parts, reduce the processing cost, but also make the surface processing quality and processing accuracy of parts reach a higher level. High-speed processing has been widely used in aviation, aerospace, automobile and ultra-precision micromachining and other fields. [0003] In the process of high-speed cutting, a series of situations such as tool wear, chipping, breakage, failure, chip formation, fracture, and cutting interruption often occur. These conditions have a specific impact on the machining process and the state of the tool. During the machining process, these accidents will affect the cutting ...

AI Technical Summary

Problems solved by technology

[0006] 1. Since the vibration frequency of the tool and the workpiece during chip formation is high, basically exceeding 10KHZ, an AE sensor is required, and the AE sensors of the existing monitoring system are directly installed on the workpiece or tool. During the process, the noise signal caused by the vibration of the tool or workpiece will be mixed with the signal that the AE sensor needs to collect, thus affecting the collection accuracy of the AE sensor and distorting the monitoring function of the monitoring system

[0007] 2. It is impossible to correlate the signal collected by the AE sensor with the shape of the chip, the state of the tool and the workpiece, whether there is contact friction between the chip and the rake face of the tool, and the state of tool wear. Effective monitoring and analysis has a narrow scope of application

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