Numerical control machining method for U-shaped cavity thin wall edge strip type titanium alloy part

Abstract

Provided is a numerical control machining method for a U-shaped cavity thin wall edge strip type titanium alloy part. A bottoming drill with a suitable diameter and overhang is selected according to the groove width and the groove depth of a U-shaped cavity, rough machining is performed on most machining allowance in the U-shaped cavity in the machining mode of drill inserting, semi-finishing milling is performed on the inner walls of the two sides of the U-shaped cavity in a skinning machining mode by adopting a long-edge square-shoulder milling cutter, finish machining is performed on a web plate and machining allowance inside and outside the side wall of the part by adopting a solid carbide cutting tool, and the inner and outer shapes of the side wall are machined by adopting a machining mode of step supporting milling.

Description

technical field [0001] The invention relates to the technical field of numerical control machining, in particular to the numerical control machining technology of aircraft titanium alloy parts with a U-shaped cavity thin-walled edge structure. Background technique [0002] Parts with U-shaped cavity thin-walled edge structure are a typical structure of aircraft titanium alloy parts. Due to the large amount of deformation in the processing of such parts, it is often difficult to ensure their wall thickness, which leads to the phenomenon of out-of-tolerance parts. Processing The pass rate is low. [0003] For the processing of titanium alloy parts with U-shaped cavity and thin-walled edge structure, the traditional processing method is to use a large-diameter tool inlaid with carbide strips, and adopt a step-by-step machining strategy to perform rough and fine machining of U-shaped cavity. The processing method, due to the inherent characteristics of titanium alloy materials,...

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Problems solved by technology

[0002] Parts with U-shaped cavity thin-walled edge structure are a typical structure of aircraft titanium alloy parts. Due to the large amount of deformation in the processing of such parts, it is often difficult to ensure their wall thickness, which leads to the phenomenon of out-of-tolerance parts. Processing Low pass rate

[0003] For the processing of titanium alloy parts with U-shaped cavity and thin-walled edge structure, the traditional processing method is to use a large-diameter tool inlaid with carbide strips, and adopt a step-by-step machining strategy to perform rough and fine machining of U-shaped cavity. Processing method, due to the inherent characteristics of titanium alloy materials, the cutting force of the tool is large during processing, releasing a large amount of cutting heat, and the accumulated internal stress can easily lead to deformation of the parts

Secondly, the tool bears a large cutting force during the cutting process, which causes the tool to vibrate, let the tool break or even break during the machining process, and the machining dimensional accuracy cannot be guaranteed.

Thirdly, the cutting speed of traditional cutting tools is low, the cutting volume is small, the processing efficiency of parts is low, and the product quality is not stable enough

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