CN-121973308-A - 3D printing method for concrete thin-wall member

CN121973308ACN 121973308 ACN121973308 ACN 121973308ACN-121973308-A

Abstract

A3D printing method for a concrete thin-wall member, particularly relates to the technical field of 3D printing concrete, and comprises the following steps of obtaining a model and setting parameters, generating corresponding paths for each printing layer according to the relation between the wall thickness T and the diameter D of a nozzle of a printing head, and executing printing. According to the invention, the existing printing equipment and concrete materials are not required to be changed, and the path planning optimization is only adopted to accurately match the adaptive paths for the printing layers with different wall thicknesses, so that the continuity of the interlayer weak surface formed by printing of the continuous contour path can be broken, and the defects that slurry accumulation, non-compact molding and the like can occur when the wall thickness of a certain printing layer is not integral multiple of the nozzle diameter of a printing head when the printing layer is printed by adopting the contour layer paths distributed according to the alternating sequence can be avoided. The method remarkably improves the interlayer bonding strength and the overall mechanical uniformity of the component, has simple process, low cost and strong universality, is suitable for 3D printing of the wall-thickness-constant and wall-thickness-variable thin-wall component, and effectively avoids the defects caused by adjusting process parameters and replacing equipment.

Inventors

HUANG QUNXIAN
LI JIAN
HUANG JUN
LIAN YU
HONG YI
HONG KUN

Assignees

华侨大学
国建华中建设有限公司
交通运输部东海航海保障中心厦门航标处

Dates

Publication Date: 20260505
Application Date: 20260408

Claims (7)

1. The 3D printing method for the concrete thin-wall member is characterized by comprising the following steps of: The method comprises the steps of firstly, obtaining a three-dimensional digital model of a concrete thin-wall member to be printed through model obtaining and parameter setting, extracting a member wall thickness value T corresponding to each layer of printing height in the model, and determining a printing head nozzle diameter D of 3D printing equipment; Generating corresponding paths for each printing layer according to the relation between the wall thickness T and the nozzle diameter D of the printing head; The method comprises the steps of generating a continuous surrounding path, generating a reciprocating printing path, wherein if T=n×D, n is a positive integer, the path leading direction is a first leading direction, the path forms a contour layer path, generating an interlocking layer path if T is not positive integer multiple of D, the path leading direction is a second leading direction, the second leading direction forms an included angle of 80-100 degrees with the first leading direction, the printing path forms the interlocking layer path, and replacing the contour layer path of a middle printing layer with the interlocking layer path if all the printing layers of continuous 3 layers meet T=n×D and n is larger than or equal to 2, and controlling the printing equipment to print the concrete thin-wall member layer by layer according to the path generated by each printing layer.
2. The method according to claim 1, wherein in the second step, if there are 3 consecutive print layers having interlocking layer paths, the second dominant direction of each interlocking layer path of consecutive print layers is the same as the first dominant direction.
3. A method of 3D printing a concrete thin-walled member as defined in claim 1 wherein said interlocking layer path is a zigzag path.
4. The 3D printing method of a concrete thin-wall member according to claim 1, wherein the diameter D of the nozzle of the printing head is 8mm to 12mm.
5. The 3D printing method of a concrete thin-wall member according to claim 1, wherein the wall thickness of any position of the concrete thin-wall member to be printed is not more than 1/10 of the total height of the concrete thin-wall member to be printed.
6. A method of 3D printing of concrete thin-walled members according to claim 1 wherein the concrete thin-walled members to be printed comprise equal wall thickness concrete thin-walled members and variable wall thickness concrete thin-walled members.
7. A method of 3D printing a concrete thin-walled member according to any of claims 1-6 wherein the second dominant direction is at an angle of 90 ° to the first dominant direction.

Description

3D printing method for concrete thin-wall member Technical Field The invention relates to the technical field of 3D printing concrete, in particular to a 3D printing method for a concrete thin-wall member. Background The 3D printing concrete technology (concrete additive manufacturing) has the advantages of automation, high freedom, no template and the like, and has wide prospect in the field of construction. The technology constructs the component by stacking concrete slurry layer by layer, but the technology is just the process characteristic of stacking layer by layer, so that the mechanical property of the component has obvious anisotropy, namely the material of the later layer is stacked on a cold joint which is preliminarily solidified on the former layer, so that the interlayer bonding strength is far lower than that of a material body, a continuous mechanical weak surface is formed, and the bearing capacity and durability of the component are seriously influenced. In the related research of the existing path planning, a part of schemes provide a path design of orthogonal alternation of a contour layer and an interlocking layer, so that continuity of an interlayer weak surface is broken to a certain extent, but the methods are all general fixed designs aiming at equal-wall-thickness components, the matching property of the wall thickness of the components and the diameter of a printing head nozzle is not considered, when the wall thickness of a printing layer of a variable-wall-thickness component is printed, when the wall thickness of the printing layer of a certain layer is not an integer multiple of the diameter of the printing head nozzle, the printing layer adopts the path printing of the contour layer distributed according to an alternating sequence to print the defects of slurry accumulation, non-compact formation and the like. Therefore, on the premise of not changing the existing 3D printing hardware, concrete materials and core process parameters, the problem of interlayer weakness caused by adopting a contour layer printing path for continuous printing layers can be solved, and the printing requirements of printing layers with different wall thicknesses can be met. Disclosure of Invention Aiming at the defects existing in the background technology, the invention aims to provide a 3D printing method for a concrete thin-wall member. In order to achieve the above purpose, the present invention provides the following technical solutions: A3D printing method for a concrete thin-wall member comprises the following steps: The method comprises the steps of firstly, obtaining a three-dimensional digital model of a concrete thin-wall member to be printed through model obtaining and parameter setting, extracting a member wall thickness value T corresponding to each layer of printing height in the model, and determining a printing head nozzle diameter D of 3D printing equipment; Generating corresponding paths for each printing layer according to the relation between the wall thickness T and the nozzle diameter D of the printing head; The method comprises the steps of generating a continuous surrounding path, generating a reciprocating printing path, wherein if T=n×D, n is a positive integer, the path leading direction is a first leading direction, the path forms a contour layer path, generating an interlocking layer path if T is not positive integer multiple of D, the path leading direction is a second leading direction, the second leading direction forms an included angle of 80-100 degrees with the first leading direction, the printing path forms the interlocking layer path, and replacing the contour layer path of a middle printing layer with the interlocking layer path if all the printing layers of continuous 3 layers meet T=n×D and n is larger than or equal to 2, and controlling the printing equipment to print the concrete thin-wall member layer by layer according to the path generated by each printing layer. Further, in the second step, if there are 3 consecutive print layers having interlocking layer paths, the second dominant direction of each interlocking layer path of consecutive print layers is the same as the first dominant direction. Further, the interlocking layer path is a zigzag path. Further, the diameter D of the nozzle of the printing head is 8-12 mm. Further, the wall thickness of any position of the thin-wall concrete member to be printed is not more than 1/10 of the total height of the thin-wall concrete member to be printed. Further, the concrete thin-wall member to be printed comprises a concrete thin-wall member with equal wall thickness and a concrete thin-wall member with variable wall thickness. Further, the second dominant direction forms an included angle of 90 degrees with the first dominant direction. The beneficial effects of the invention are as follows: The invention provides a 3D printing method for a concrete thin-wall member, which provides a path self-adaptive sele