An error compensation method based on binder jetting additive manufacturing

By calculating the offset error of the triangle face sheet and performing vertex offset compensation, the dimensional error problem caused by the interaction between step error and penetration error in adhesive jet additive manufacturing is solved, and high-precision part molding is achieved.

CN115906209BActive Publication Date: 2025-08-01HEBEI UNIV OF TECH +1
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Patent Information

Application Number
CN202211523672.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-11-30
Publication Date
2025-08-01
Estimated Expiration
2042-11-30

AI Technical Summary

Technical Problem

In the prior art, the dimensional error compensation method caused by the interaction between step error and permeability error in adhesive spray additive manufacturing is lacking, which affects the precision of part forming.

Method used

By calculating the offset error formula of the triangular face sheet, the STL model is compensated based on the vertex offset. Taking into account the interaction between the step error and the permeability error, the offset error formula of the angle between the normal vector direction and the forming direction of the triangle face sheet is used to calculate the vertex offset compensation value and perform the model vertex offset to keep the topological structure unchanged.

Benefits of technology

Improve the molding accuracy of adhesive jet additive manufacturing, reduce the synthesis error of step error and penetration error, and ensure the printing accuracy and compensation efficiency of parts.

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Abstract

The present invention is an error compensation method based on binder jetting additive manufacturing. The method includes the following steps: obtaining an offset error formula for triangular facets by considering the interaction between staircase error and penetration error, determining the number m of triangular facets in the input STL model, defining the set M as an array of triangular facets Tj, where m is the number of elements in the set M, and obtaining the offset errors of all triangular facets in the STL model; calculating the offset compensation value of the STL model vertices according to the projection of the offset error of the triangular facets in the vertex normal vector direction. After traversing all vertices, the vertices vi of the STL model are offset inward along the opposite direction of the vertex normal vector according to the corresponding offset compensation values, and the offset vertices are obtained, and then the compensated STL model is obtained. The present invention reduces the dimensional error caused by the interaction between staircase error and penetration error and realizes high-precision additive manufacturing.
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