Self-adaptive ultrasonic-assisted machining platform and method for two-step multi-partition force regulation and control

Abstract

The invention discloses a double-step multi-partition force regulation self-adaptive ultrasonic auxiliary machining platform and method, and the platform comprises a machine tool body, a computer, a machine tool body controller, an amplifier, an acquisition card, an ultrasonic power supply controller, an ultrasonic power supply, and a dynamometer sensor which is installed on a machine tool body table top of the machine tool body. The dynamometer sensor is mainly composed of a first-stage multi-partition piezoelectric ceramic array and a second-stage multi-partition piezoelectric ceramic array, measurement of cutting force and torque values of different areas and different directions of a workpiece is achieved, the stress part and the stress size of the workpiece are accurately positioned, and the limitation that a conventional dynamometer can only monitor resultant force of different areas of the same workpiece is eliminated. The ultrasonic auxiliary machining parameters are adjusted on line twice, a conventional ultrasonic auxiliary machining constant parameter mode is changed, the two-time machining parameters are compensated in a self-adaptive mode, it is guaranteed that the vibration frequency and the cutting force are both within the required range, the advantages of ultrasonic auxiliary machining are further exerted, and the machining quality is improved.

Description

technical field [0001] The invention relates to the technical field of self-adaptive processing platforms, in particular to a self-adaptive ultrasonic-assisted processing platform and method for two-step multi-zone force regulation. Background technique [0002] Ultrasonic assisted machining has been widely used in recent years due to its many advantages in reducing cutting force and cutting heat, improving machining quality and machining efficiency. However, under the load machining state, the ultrasonic vibration frequency will drift, which is not conducive to the machining stability. In addition, as the wear degree increases, the cutting force gradually increases, and problems such as surface roughness increase, surface burn, and surface accuracy decrease are prone to occur. To keep the machining quality stable, the machining parameters can be modified in time to compensate for the influence of vibration frequency and cutting force changes; the invention patent (CN 111300...

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Problems solved by technology

[0003] The current dynamometer can only measure the cutting force in the overall processing area, but cannot measure the processing area in different areas, and cannot obtain the change of the specific force-bearing part of the cutting force. For example, for the end face milling of a disc-shaped part, it is impossible to accurately locate the force-bearing part

In addition, ultrasonic-assisted machining parameters include not only machine tool body parameters (speed, feed, depth of cut), but also ultrasonic vibration parameters (ultrasonic vibration frequency, ultrasonic amplitude). Drift, lack of online control method for ultrasonic assisted machining process, therefore, an adaptive ultrasonic assisted machining platform and method for two-step multi-partition force control are urgently needed to solve the above problems

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