US 11,914,339 B2
Datum selection methods and systems for minimizing hole position errors in group hole machining of large components
Jie Li, Chengdu (CN); Dawei Liu, Chengdu (CN); Zhenbo Ma, Chengdu (CN); Yuanji Liu, Chengdu (CN); Jiangyang Gou, Chengdu (CN); Ying Xie, Chengdu (CN); Chaolin Shuai, Chengdu (CN); Xuemei Chen, Chengdu (CN); Dawei Lu, Chengdu (CN); and Qingliang Chen, Chengdu (CN)
Assigned to CHENGDU AIRCRAFT INDUSTRIAL (GROUP) CO., LTD., Chengdu (CN)
Filed by CHENGDU AIRCRAFT INDUSTRIAL (GROUP) CO., LTD., Sichuan (CN)
Filed on Aug. 9, 2023, as Appl. No. 18/447,291.
Application 18/447,291 is a continuation in part of application No. PCT/CN2021/136932, filed on Dec. 10, 2021.
Claims priority of application No. 202110177385.9 (CN), filed on Feb. 9, 2021.
Prior Publication US 2023/0384755 A1, Nov. 30, 2023
Int. Cl. G05B 19/402 (2006.01)
CPC G05B 19/402 (2013.01) [G05B 2219/36201 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A datum selection method for minimizing hole position errors in group hole machining of large components, comprising:
(1) determining a type of a computer numerical control (CNC) machine tool, and establishing a topological structure of the CNC machine tool with respect to a motion unit of the CNC machine tool;
(2) establishing a theoretical postural model of a tool center point during a motion of the motion unit of the CNC machine tool according to the topological structure established in step (1);
(3) according to the theoretical postural model in step (2), establishing a hole position error model based on a distance between an actual position of the tool center point and a theoretical position in the theoretical postural model of the tool center point during a hole making process and by means of a projection relation of a plane perpendicular to an ideal axis;
(4) establishing an average error model of hole positions according to a datum selected from a machining form of group holes of components and in conjunction with the hole position error model obtained in step (3); and
(5) obtaining the average error model obtained in step (4), applying a partial derivation to variables of the average error model, and obtaining a machining datum of group holes of the corresponding components.