Curved Surface Assembly Compensation for Shape and Gap Errors
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Solution Overview
Problem
Existing methods for improving assembly quality of complex curved surface parts in electromechanical products fail to account for shape errors between curved surfaces, leading to suboptimal final product performance.
Innovation Solution
A quality prediction and adaptive compensation method that evaluates curved surface assembly quality by considering both shape error and assembly gap error, calculating an optimal compensation amount for each assembly plane to ensure high precision and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If existing methods focus only on matching gap for assembly quality improvement, then assembly gap error is reduced, but shape error between curved surfaces is ignored leading to insufficient assembly quality
Solution Approach 1:
The patent segments the assembly quality evaluation into two distinct components: shape error evaluation and assembly gap error evaluation. This segmentation allows each aspect to be measured and compensated independently, ensuring comprehensive quality control without overlooking either dimension.
Solution Approach 2:
The patent introduces dual-parameter evaluation (shape error and gap error) instead of single-parameter evaluation. By changing the evaluation parameters to include both geometric shape deviations and assembly gap measurements, the system achieves comprehensive quality assessment that addresses the previously overlooked shape error dimension.
2Manufacturing precision
If geometric and thermal errors of machine tool are considered (accounting for 50%-70% of total errors), then machining precision can be improved, but complex curved surface assembly quality still cannot be ensured without shape error compensation
Solution Approach 1:
The patent performs preliminary action by predicting machining errors (including geometric and thermal errors) before assembly, and pre-compensating shape errors through adaptive compensation calculation. This preliminary error prediction and compensation ensures that when parts are assembled, the shape errors have already been corrected, guaranteeing final assembly quality.
Solution Approach 2:
The patent implements feedback mechanisms by measuring actual geometric and thermal errors, feeding this information into error prediction models, and using the predicted errors to guide adaptive compensation. This closed-loop feedback ensures that machining errors are continuously monitored and corrected, maintaining both machining precision and final assembly quality.
3Manufacturing precision
If adaptive compensation is applied to both shape error and assembly gap error, then assembly quality is significantly improved, but measurement and calculation complexity increases
Solution Approach 1:
The patent introduces intermediary elements including error prediction models that bridge machining parameters and assembly quality, and adaptive compensation calculations that translate dual-parameter evaluation results into actionable compensation amounts. These intermediaries simplify the complex relationship between multiple error sources and compensation actions, making the system manageable despite increased measurement requirements.
Data Source
AI summary
A quality prediction and adaptive compensation method and apparatus for curved surface assembly are provided. The method includes: inputting a geometric error function and a thermal error function into a spatial error model, to obtain a machining error prediction model; superimposing obtained machining errors on a theoretical surface of an assembly surface, to obtain a predicted machining surface; calculating, according to an assembly median plane determined based on the assembly surface, shape errors and assembly gap errors, and predicting curved surface assembly quality of a part by using the shape errors and the assembly gap errors; calculating an adaptive compensation amount of each assembly plane of the assembly surface based on the shape errors, the assembly gap errors, and the machining errors, when the curved surface assembly quality does not meet a preset assembly quality requirement, and compensating the corresponding assembly plane by using the adaptive compensation amount.