Hole strengthening machining method based on ultrasonic bending vibration boring

Abstract

The invention provides a hole strengthening machining method based on ultrasonic bending vibration boring. The method comprises the steps that a workpiece and a boring tool are enabled to be installedon a rotating shaft of a machine tool and the front end of an amplitude transformer in an ultrasonic bending vibration device respectively, wherein the workpiece is provided with a machined hole; under the driving of the rotating shaft, the boring tool and the workpiece keep relative rotary motion, and under the action of an ultrasonic bending vibration transducer in the ultrasonic bending vibration device, the boring tool performs one-way ultrasonic bending vibration; boring parameters and amplitude and frequency of ultrasonic bending vibration are set according to the rotating speed of therotating shaft, the diameter of the machined hole and the diameter of the cutting edge of the boring tool; and the machine tool and the ultrasonic bending vibration device are started to conduct ultrasonic bending boring strengthening machining on the machined hole, so that a tissue fibrosis layer is formed on the surface of the inner wall of the machined hole. According to the hole strengtheningmachining method based on ultrasonic bending vibration boring, the tissue fibrosis layer formed on the boring machining surface can effectively improve the performance of the machined hole for bearingthe alternating load in the radial direction, and strengthening machining of the machined hole is achieved.

Description

technical field [0001] The invention relates to anti-fatigue manufacturing of structural features of parts, in particular to a hole strengthening processing method based on ultrasonic bending vibration boring. Background technique [0002] In aviation, aerospace, automobile manufacturing and other fields, hole structures are often used for connection and assembly between structural parts, especially there are thousands of connection holes and fastening holes on aircraft. However, the hole structure is a typical stress concentration site on the load-bearing structural part. When the structural part is subjected to alternating loads, fatigue cracks are easily generated at the hole structure, which affects the safety and reliability of the entire product. Therefore, improving the fatigue resistance of the porous structure has very important engineering application value. [0003] At present, the commonly used hole strengthening technologies mainly include cold extrusion, rolli...

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Problems solved by technology

[0006] In order to solve the above-mentioned problems in the prior art, the present invention provides a hole strengthening processing method based on ultrasonic bending vibration boring, which solves the problems of single application range and alternating load in the hole strengthening processing technology of structural parts in the prior art. Performance issues that need to be improved

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