Aviation Industry Corp of China has developed a method to minimize hole position errors in group hole machining of large components. By establishing models and selecting appropriate datums based on CNC machine tool type, this method enhances positional accuracy in aircraft component machining. GlobalData’s report on Aviation Industry Corp of China gives a 360-degree view of the company including its patenting strategy. Buy the report here.

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According to GlobalData’s company profile on Aviation Industry Corp of China, Smart factory applications was a key innovation area identified from patents. Aviation Industry Corp of China's grant share as of February 2024 was 61%. Grant share is based on the ratio of number of grants to total number of patents.

Datum selection method for minimizing hole position errors in machining

Source: United States Patent and Trademark Office (USPTO). Credit: Aviation Industry Corp of China Ltd

A recently granted patent (Publication Number: US11914339B2) discloses a datum selection method aimed at minimizing hole position errors in group hole machining of large components. The method involves determining the type of a computer numerical control (CNC) machine tool, establishing a theoretical postural model of a tool center point, and creating an average error model of hole positions based on the selected datum and hole position error model. By applying partial derivations to variables of the average error model, the method obtains a machining datum for group holes of corresponding components.

In the detailed claims of the patent, the method further elaborates on the establishment of the topological structure of the CNC machine tool, the theoretical postural model during motion, and the construction of the hole position error model. It also outlines the steps for selecting a corresponding datum based on the machining form of group holes, whether skeleton or skinned, and the principles for determining the origin coordinate value for each type. Additionally, the method provides specific procedures for obtaining a machining datum for skeleton group hole machining and skinned group hole machining, emphasizing the minimization of hole position errors through mathematical derivations and modeling techniques. Overall, the patent offers a systematic approach to improving the accuracy and precision of hole positioning in group hole machining processes for large components using CNC machine tools.

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