Longitudinal-torsional ultrasonic vibration drilling method for wind power bearing structural hole

By applying longitudinal torsion composite ultrasonic vibration and controlling process parameters in the longitudinal torsion ultrasonic vibration drilling method of wind power bearing structural holes, the problem of difficulty in taking into account the hole surface strengthening and surface roughness in the prior art is solved, and the effect of reducing the hole surface roughness and improving the hole surface performance is achieved.

CN119747707APending Publication Date: 2025-04-04HENAN UNIV OF SCI & TECH
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Patent Information

Application Number
CN202510146018.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-02-10
Publication Date
2025-04-04

AI Technical Summary

Technical Problem

The existing hole processing and hole strengthening methods are difficult to take into account both the hole surface strengthening and the surface roughness, and cannot effectively improve the fatigue life of the wind power bearing structure holes.

Method used

The vertical torsion ultrasonic vibration drilling method is adopted to apply longitudinal torsion composite ultrasonic vibration during the drilling process through the drill bit to achieve intermittent cutting, and the process parameters are controlled during the processing process to generate a negative rear angle area, reducing the surface roughness of the hole and improving the performance of the hole surface.

Benefits of technology

Through the longitudinal torsion ultrasonic vibration drilling method, the surface roughness and cutting temperature of the hole are reduced, the surface performance and fatigue strength of the hole are improved, and the processing requirements of wind power bearing structure holes are met.

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Abstract

According to the longitudinal-torsional ultrasonic vibration drilling method for the wind power bearing structural hole, longitudinal-torsional composite ultrasonic vibration is applied in the drilling process of a drill bit in an ultrasonic vibration drilling mode, so that the drill bit can be periodically separated from a machining face, intermittent cutting of longitudinal-torsional ultrasonic vibration is achieved, the average cutting force is reduced, and the machining efficiency is improved. And a cutting area is thoroughly opened, dissipation of cutting heat is facilitated, then the cutting temperature is reduced, the hole surface roughness can be reduced through reduction of the cutting force and the cutting temperature, and the machining precision is improved. Meanwhile, due to the fact that the working rear angle of the drill bit changes periodically in the machining process, a negative rear angle area is generated on the rear tool face of the side edge of the drill bit, high-frequency impact and ironing are conducted on the surface of a workpiece, groove marks on the surface of a hole can be ironed, the roughness of the surface of the hole is reduced, and beneficial residual compressive stress and a machining hardened layer are generated on the surface layer of the hole. Therefore, the hole surface roughness can be reduced, and the hole surface performance and fatigue strength are improved.
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