Blisk or blade molded surface ultrasonic strengthening method

Abstract

The invention discloses a blisk or blade molded surface ultrasonic strengthening method. The method comprises the following steps that firstly, an ultrasonic impact device and a machining center spindle are fixedly connected, and an ultrasonic impact device main machine power supply is turned on; secondly, a machining center controls the ultrasonic impact device, through the spindle, to move alonga finish machining route, and ultrasonic impact machining is performed on the whole surface of a milled workpiece, wherein the vibration direction of the ultrasonic impact device is always the workpiece surface normal direction; thirdly, after machining for the workpiece is completed, the workpiece on a clamp is replaced, and the second step is repeated; and fourthly, if machining for all workpieces is completed, the machining center stops working, the ultrasonic impact device main machine power supply is turned off, the machined workpiece is taken down, and the ultrasonic impact device is taken down. Tool marks on a blade molded surface are removed, the surface roughness is reduced, the pressure stress on the surface of a blade is increased, the surface integrity of the blade molded surface is greatly improved, the airflow resistance can be reduced when the fatigue strength is improved, and meanwhile, requirements for line precision and surface precision are met.

Description

technical field [0001] The invention belongs to the field of fine machining, and relates to a method for ultrasonic strengthening of a whole blisk or blade profile. Background technique [0002] High-performance aeroengines require high-strength, high-fatigue-resistant component supports such as blisks or blades. After the milling of the overall blisk or blade profile, there will be vibrating wavy lines left by the milling cutter on the surface. The surface roughness Ra is generally between 1.6 μm and 3.2 μm, and subsequent polishing, vibration finishing and spraying are required. Shot strengthening and other surface strengthening treatment processes are used to improve the surface quality and sub-surface quality of the blade, so as to greatly enhance the durability of the overall blisk, prevent surface cracks, thereby increasing the service life and reducing maintenance and repair costs. [0003] Traditional polishing, vibration finishing and other processes can only parti...

AI Technical Summary

Problems solved by technology

Shot peening is more difficult or the effect is affected on parts with irregular surfaces. Vibration finishing may cause deformation to strengthen thin parts, and may affect surface roughness or size. It requires high equipment for strengthening large structural parts.

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