Error compensating method for material-increase manufacturing

Abstract

The invention provides an error compensating method for material-increase manufacturing. The method includes the steps that model data of a part are read, and a three-dimensional digital model of the part is established according to triangular face sheets; an independent correction offset is set for each triangular face sheet and determined by a normal vector of the triangular face sheet and the semi-ellipsoidal shape of a sedimentation unit at the position where the triangular face sheet is located; all the triangular face sheets forming the three-dimensional digital model of the part are deflected to the interior of the part according to the set independent correction offsets corresponding to the triangular face sheets, a three-dimensional digital correction model of the part is obtained, and the manifold property of the three-dimensional digital correction model of the part is maintained; and layering and material-increase manufacturing of each layer are directly performed to achieve path control of a sedimentation path according to the three-dimensional digital correction model of the part, and a subsequent material-increase manufacturing craft process is driven. The error compensating method can reduce anisotropy forming errors caused by anisotropy of the size of the sedimentation unit during material-increase manufacturing and increase material-increase manufacturing precision and forming quality.

Description

technical field [0001] The invention relates to the technical field of additive manufacturing, in particular to an error compensation method for additive manufacturing. Background technique [0002] The core of additive manufacturing technology is the idea of ​​discrete stacking. Its principle is to slice the 3D model of the part to obtain a series of parallel two-dimensional plane profiles, and then superimpose and deposit each layer through the manufacturing equipment to obtain the final part. Additive manufacturing is a new type of forming method, which differs from the traditional removal process and adopts the method of gradually accumulating materials to manufacture three-dimensional entities. It is a "bottom-up" manufacturing method, which is directly driven by the three-dimensional data of the parts and manufactured in layers. Rapid prototyping (RAPID PROTOTYPING, RP), physical freedom manufacturing, 3D printing, etc. are different names for this type of technology. ...

AI Technical Summary

Problems solved by technology

[0014] The above-mentioned error compensation method, because the minimum deposition unit has the characteristics of three-dimensional XYZ three-dimensional unequal dimensions, and the existing compensation cannot deal with the Z-direction penetration error, resulting in a large Z-direction dimensional error of the part, resulting in deformation; at the same time, because the minimum deposition The size of the unit in the XYZ direction is different. The existing error compensation is generally an equidistant offset on the XY plane, and the three-dimensional plane is actually an unequal offset, which cannot accurately deal with the XYZ anisotropic error.

[0015] The above problems have affected the accuracy and forming quality of additive manufacturing, and have hindered the market application of additive manufacturing. Therefore, there is a need for a better way to make up for these defects.

Images