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

Abstract

The invention provides a design method of a smooth inner cavity of a hollow casting mold or a hollow sand core. The design method comprises the steps of modeling standard blocks, and then outputting an STL formatted file, wherein the surfaces of the constructed standard blocks are smooth; outputting the STL formatted file of the casting mold or the sand core in modeling software; reading the STL formatted file of the standard blocks, and scaling the size of the corresponding direction of the standard blocks; reading the STL formatted file of the casting mold or the sand core; putting the scaled standard blocks in an array; determining the relation between the outline of the standard blocks and the outline of the casting mold or the sand core in each perpendicular cross section of an X axis, a Y axis and a Z axis; determining the distance between the outline of the casting mold or the sand core and the outline of each standard block; and reversing normals of all triangular patches of the standard blocks which are reserved ultimately, and adding the reversed standard blocks to the STL formatted file of the casting mold or the sand core so as to generate the STL formatted file of thehollow casting mold or the hollow sand core with the smooth inner 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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