Adjustable damping damping device and vibration reduction method in the milling process of thin-walled parts

Abstract

The invention relates to an adjustable damping type vibration-attenuation and chatter-suppression device in the milling process of thin-walled workpieces and a vibration-attenuation method. According to a conventional vibration-attenuation device for thin-walled workpieces, the functions of suppressing blade chatter and attenuating vibration are majorly achieved by modifying and optimizing machining tools, work fixtures and machining cutters or positioning the cutters, arranging machining processes and the like; but the effects are unsatisfactory or limited, and economic input is often large. The adjustable damping type vibration-attenuation and chatter-suppression device in the milling process of the thin-walled workpieces comprises a vibration-attenuation and chatter-suppression unit (9) which comprises a seal chamber (8); a top plate (1) is mounted on the upper plane of the seal chamber; the outer layer of the seal chamber is a restraint layer (7) which is internally provided with a damping layer (6); a damping layer base plate (5) is mounted inside the damping layer and contains magnetorheological fluid (3) inside; six permanent magnets (2) are mounted in the magnetorheological fluid (3); and a coil (4) is wound outside each permanent magnet. The adjustable damping type vibration-attenuation and chatter-suppression device is used in the milling process of the thin-walled workpieces.

Description

Technical field: [0001] The invention relates to the field of numerical control machining of thin-walled parts, in particular to a method for suppressing the occurrence of flutter and reducing thin-walled vibrations during processing when a multi-axis numerical control machine tool (such as a five-axis numerically controlled machine tool) processes thin-walled parts, especially when processing impeller blades. method. Background technique: [0002] At present, the traditional vibration and vibration suppression devices for thin-walled parts are mostly aimed at the modification, optimization or positioning of the tool, and the arrangement of the processing flow on the processing machine tool, the fixture and the processing tool, so as to achieve the effect of suppressing the blade flutter and damping. However, the effects are mostly unsatisfactory or limited, and the economic investment is often very large. With the rapid development of modern industry, blades as thin-walled...

AI Technical Summary

Problems solved by technology

[0002] At present, the traditional thin-walled parts vibration and vibration reduction devices are mostly aimed at processing machine tools, fixtures and processing tools, modification, optimization or tool positioning, processing flow arrangements, etc. to achieve the effect of suppressing blade chatter and vibration reduction. But the effect is mostly unsatisfactory or limited, and the economic investment is often large

With the rapid development of modern industry, blades as thin-walled parts are widely used in machine tools, vehicles, aerospace and other civil or military fields, and most of the blade surfaces are non-developable ruled surfaces and free-form surfaces. The quality of the blade directly determines the performance of the whole machine, so it plays an important role, but because the blade has the characteristics of thin wall, poor rigidity, time-varying thickness, and large machining allowance, flutter is easy to occur during the machining process, which will not only reduce the The machining accuracy of the parts affects the service life of the machine tool and the cutting tool, and seriously restricts the cutting efficiency, so the vibration reduction of the impeller machining on the machine tool is very important;

[0003] On the other hand, for thin-walled parts, in addition to considering chatter, another serious problem is that even if the thin-walled part does not vibrate during processing, due to the thin wall of the thin-walled part and poor rigidity, the vibration is severe during processing, which leads to The size and precision of parts are greatly reduced, which restricts the high-precision machining of thin-walled parts, so how to suppress the vibration of thin-walled parts is also a major issue in the field of mechanical processing;

Images