Laser additive manufacturing method for homogeneous functionally graded material and structure

A technology of functionally graded materials and laser additives, which is applied in the direction of improving energy efficiency and process efficiency, and can solve the problems of inability to manufacture homogeneous functionally graded materials and structures

Active Publication Date: 2014-12-10
CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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Problems solved by technology

[0006] In view of this, the object of the present invention is to provide a laser additive manufacturing method for homogeneous functionally graded materials and struc

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  • Laser additive manufacturing method for homogeneous functionally graded material and structure

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[0017] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0018] figure 1 It is a schematic flow chart of the method of the present invention. As shown in the figure, the laser additive manufacturing method of the present invention includes the following steps: Step 1: Map different functions to different temperatures, and use different temperatures as boundary conditions Applied on different parts of the three-dimensional model S0, using the three-dimensional finite element method to calculate the heat conduction equation of the model S0, and obtain the internal temperature gradient distribution, that is, the temperature field S1 of the model S0; Step 2: Extract the isothermal surface of the model to obtain different temperature marks surface set S2; Step 3: Slice the surface set S2 to obtain the contour of the intersection line between each layer and the isothermal surface, that is, the plane is...

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Abstract

The invention relates to a laser additive manufacturing method for a homogeneous functionally graded material and structure. The method includes the following steps that different functions are mapped into different temperatures which serve as boundary conditions to be exerted on different parts of a three-dimensional model; a three-dimensional finite element method is used for calculating a heat conduction equation of the model, inner temperature graded distribution, namely the temperature field of a model, is obtained, that is a temperature field of the model is obtained; an isothermal surface of the model is extracted, and a curved surface set with different temperature marks is obtained; slicing is conducted on the curved surface set, the intersection outline of each layer and the isothermal surface is obtained, in other words, plane isothermal lines are obtained; slices of each layer are processed, and a scanning route with laser parameters of the single layer in graded variation is obtained; the steps are repeatedly conducted until slicing is completed and a laser scanning route of the model is obtained; the generated laser scanning route is input into a laser 3D printing machine to control the additive manufacturing process, and the homogeneous functionally graded structure is obtained. According to the additive manufacturing method, the fact that the homogeneous functionally graded material and the homogeneous functionally graded structure can be manufactured in an additive mode is achieved, and the fact cannot be achieved through a current laser additive manufacturing method.

Description

technical field [0001] The invention belongs to the technical field of laser additive manufacturing, and relates to a laser additive manufacturing method for homogeneous functionally graded materials and structures. Background technique [0002] From the perspective of material structure, functionally graded materials refer to selecting two (or more) materials with different properties, and continuously changing the composition and structure of the two (or more) materials to make the interface disappear and lead to material The performance of the material changes slowly with the composition and structure of the material. At present, typical functionally graded materials such as Ti / Al2O3 are composed of two materials, Ti and Al2O3. It has good heat resistance, heat insulation, high strength and high temperature oxidation resistance of Al2O3 ceramics. [0003] Currently, laser stereolithography (LENS) can be used to additively manufacture functionally graded materials and st...

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Application Information

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IPC IPC(8): B22F3/105
CPCY02P10/25
Inventor 范树迁段宣明王国玉
Owner CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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