Measuring device for friction coefficient between tool and workpiece under ultrasonic vibration

Abstract

The friction coefficient test device between the tool and the workpiece under ultrasonic vibration conditions, including machine tool table, machine tool spindle, ultrasonic vibration loading system, fixture, piezoelectric three-way force measuring instrument, charge amplifier, data acquisition device, data analysis system and computer; Through the movement of the spindle of the machine tool, the tool material test piece exerts a load on the workpiece material test piece, and the movement of the machine tool table drives the frictional movement between the workpiece material test piece and the tool material test piece, and the piezoelectric three-way dynamometer detects the electric force. The signal is converted from an analog signal to a digital signal, and then through the charge amplification, data acquisition device, data analysis system, and finally input to the computer, and the friction coefficient between the tool and the workpiece is output after software analysis and calculation. The present invention has high precision, convenient operation, fully utilizes the advantages of the existing machine tools and force measuring instruments of the research institution, and can measure the friction coefficient of samples of different shapes and materials under different ultrasonic vibration conditions and general processing conditions .

Description

technical field [0001] The invention belongs to the technical field of ultrasonic vibration cutting processing, in particular to a device for testing the friction coefficient between a tool and a workpiece under the condition of ultrasonic vibration. Background technique [0002] Ultrasonic vibration cutting is a special cutting technology that makes the tool vibrate at a high speed along the cutting direction at a frequency of 20-50KHz. [0003] Ultrasonic vibration cutting is a kind of pulse cutting from a microscopic point of view. In a vibration cycle, the effective cutting time of the tool is very short, and the tool is completely separated from the workpiece and chips in more than 80% of the time. The cutting tool is in intermittent contact with the workpiece and chips, which reduces the friction on the cutting tool, greatly reduces the heat generated, and significantly reduces the cutting force, avoiding the phenomenon of "giving way" during ordinary cutting, and doe...

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Problems solved by technology

[0006] 2. High machining accuracy mainly depends on the accuracy of the machine tool used, and the shape and position tolerance of the processed workpiece is almost close to the relevant accuracy of the machine tool;

This test method can only test the friction coefficient between the workpiece material specimen and the tool material specimen under general conditions, and cannot be used to test the friction characteristics between the tool and the material during actual cutting motion

And it cannot be used in conjunction with existing machine tools, let alone test the friction characteristics between the tool and the workpiece under the condition of ultrasonic vibration

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