Design method of hollow mold or smooth inner cavity of hollow sand core

Abstract

The invention provides a method for designing a smooth inner cavity of a hollow casting mold or a hollow sand core, which includes modeling a standard block, and the surface of the constructed standard block is smooth, and then outputting an STL format file; outputting in a modeling software The STL format file of the mold or sand core; read the STL format file of the standard block, and scale the size of the corresponding direction of the standard block; read the STL format file of the mold or sand core; convert the scaled standard Blocks are arrayed; in each cross-section perpendicular to the X, Y or Z axis, judge the relationship between the contour of the standard block and the contour of the mold or sand core; judge the shape of the mold or sand core The distance between the outline and the outline of each standard block; reverse the normals of all the triangular faces of the finally retained standard block, and add the reversed standard block to the STL format file of the sand mold or sand core , to generate an STL file of a hollowed-out mold or sand core with a smooth cavity.

Description

technical field [0001] The invention relates to the technical field of casting, in particular to a method for designing a smooth inner cavity of a hollow casting mold or a hollow sand core. Background technique [0002] Traditional molds or sand cores are compact structures with relatively thick outer contours and varying thicknesses. Therefore, during the solidification forming and cooling process of castings after pouring, it is difficult to quickly affect the casting when cooling the surface of the thick part of the mold or sand core, resulting in different cooling rates and uneven temperature distribution in different parts of the casting. As a result, the residual stress of the casting is large and the deformation is large. 3D printing technology can break away from the limitations of traditional modeling on the geometric characteristics of casting molds. 3D printing technology can form a hollow cavity in the thick part of the mold or the inside of the sand core, redu...

AI Technical Summary

Problems solved by technology

However, there is still a lack of design methods for hollow casting molds or hollow sand cores, especially the design method for forming smooth hollow inner cavities for casting molds or sand cores.

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