Thin-walled casing part non-chatter processing method and processing fixture thereof

Abstract

A thin-walled casing part non-chatter processing method and a processing fixture thereof, the processing method of the present invention includes the steps of monitoring the condition of a casing during processing by a sensor and determining whether the current processing state of the casing satisfies processing accuracy requirements, if the processing accuracy requirements are not satisfied in result of chatter, adjusting the pressing force of a pressing device in real time by a computer control system to increase the rigidity and dynamic damping of the thin-walled casing part. The fixture includes a work piece outboard clamping device and a work piece inboard clamping device mounted on a base, and the casing is arranged between the work piece outboard clamping device and the work piece inboard clamping device during processing. The work piece outboard clamping device includes an upper compression cylinder and a lower compression cylinder, the work piece inboard clamping device includes an airbag base having an upper airbag and a lower airbag mounted thereon. The top of the airbag base is also provided with an empty pressure corner cylinder. The processing method of the present invention is simple to operate and can ensure the processing accuracy.

Description

technical field [0001] The invention relates to the field of mechanical processing, in particular to a chatter-free processing method for thin-wall casing parts and a processing fixture thereof. Background technique [0002] The aero-engine is the core component of the aircraft, and the casing is the key component of the aero-engine. It is a typical thin-walled structural part. The thinnest part is only 2-3mm. The preparation materials are mostly titanium alloys, high-temperature alloys, etc., which are difficult to process. Material. Thin-walled casing parts have the characteristics of complex structure, thin wall thickness, poor rigidity, and large diameter. Therefore, the cutting temperature during processing is high and the cutting force required is large, which is prone to severe tool wear and cutting chatter and workpiece deformation. The problem. In the past, the vibration of the workpiece and the deformation of the thin wall caused by unreasonable clamping were the...

AI Technical Summary

Problems solved by technology

Thin-walled casing parts have the characteristics of complex structure, thin wall thickness, poor rigidity, and large diameter. Therefore, the cutting temperature during processing is high and the cutting force required is large, which is prone to severe tool wear and cutting chatter and workpiece deformation. The problem

In the past, the vibration of the workpiece and the deformation of the thin wall caused by unreasonable clamping were the main factors affecting the machining accuracy of the aero-engine casing.

Moreover, the traditional clamping method cannot solve the flutter phenomenon caused by the continuous decrease in wall thickness of thin-walled casing parts during the processing process

[0003] In the prior art, the invention patent "Large Thin-Walled Case Processing Shock Absorbing Fixture" (notification number: CN104440157A) discloses a thin-walled casing shock absorbing fixture, which includes a base, a bracket, a pressing Blocks, support blocks, support handles, and elastic materials, etc., through the combination of brackets, support blocks, and pressing blocks, the shock absorption effect of casing processing can be realized, but this technical solution cannot meet the requirements of thin-wall casing processing due to the wall thickness. Variations in clamping force necessitate adjustment requirements

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