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Path planning method of wire arc additive manufacturing without lap joints in layers

An additive manufacturing and path planning technology, applied in the field of additive manufacturing, can solve the problems of unstable forming quality, excessive lap joints, and reduced efficiency, so as to reduce the number of arc starting and ending points, and improve the overall quality , to avoid the effect of insufficient mechanical properties

Active Publication Date: 2020-07-10
BEIJING HANGXING MACHINERY MFG CO LTD
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of this, the present invention proposes a path planning method for arc additive manufacturing without overlap in the layer. This method adds machining allowance to the arc additive structural parts and performs layered slicing, and extracts the shape of each layered section , and simplify the cross-sectional shape into linear features, extract the linear path from it, and finally realize the full filling of the cross-section arc additive path in the way of swing filling, which is used to solve the arc starting point caused by the existing arc additive path planning method , too many arc closing points and multiple overlapping joints lead to unstable forming quality, and the large amount of programs requires step-by-step uploading of programs, resulting in reduced efficiency

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  • Path planning method of wire arc additive manufacturing without lap joints in layers
  • Path planning method of wire arc additive manufacturing without lap joints in layers
  • Path planning method of wire arc additive manufacturing without lap joints in layers

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Embodiment Embodiment 1

[0044] Such as Figure 7 , the specific implementation steps of arc additive manufacturing path planning are:

[0045] Step 1: Machining allowance design. Since arc additive materials generally form blanks, a certain machining margin is allowed. In order to make the scanning path cover the entire cross-sectional area and to achieve filling through subsequent swings, the cross-sectional shape of the arc additive manufactured structural parts after slicing is approximated as A more regular shape with margins. In this embodiment, firstly, the "cubic trapezoid" on the left side of the structure is simplified into a "cubic rectangle", and the "circular hole" on the right side of the structure is simplified into a "triangular hole", and then the structure is designed as Multiple segments of equal wall thickness for subsequent extraction of linear paths and swing fills. At the same time, all shapes and contours are properly offset outwards to ensure that the structural parts desig...

Embodiment 2

[0050] Using the path planning method in the present invention to implement the arc additive manufacturing of a typical structural part 1 block, structural part 2 ring, and structural part 3 frame, the structure of the structural part is as follows Figure 8 shown.

[0051] In contrast, the arc additive manufacturing of structural parts 1 to 3 is implemented using the traditional planning methods based on contour filling method and scanning filling method. The schematic diagrams of the intralayer path planning methods of structural parts 1, 2 and 3 are shown in Fig. Figure 9 , 10 , 11 shown. The parameters of arc additive manufacturing meet the requirements of the present invention.

[0052] According to statistics, compared with the traditional method, the path planning method in the present invention reduces the number of arc starting points and arc ending points, as shown in Table 1. probability of a defect.

[0053] Table 1 The total number of arc starting points and ...

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Abstract

The invention provides a path planning method of wire arc additive manufacturing without lap joints in layers, is applicable to a wire arc additive manufacturing process, and can solve the problems ofunstable forming quality due to excessive arc starting points, arc stopping points and multitrack lap joints caused by an existing wire arc additive path planning method, and the frequency reductiondue to large program quantity and the programs need to be uploaded step by step. The method adds a machining allowance to a wire arc additive manufacturing structural member, so that the layered cross-section shape of the wire arc additive manufacturing structural member is simplified into a regular shape with the allowance, a linear feature combination on the layered cross section is extracted onthe basis, a linear path is further formed, and finally, the additive path planning in the cross section is completed by means of the swing filling. The method greatly reduces the number of wire arcadditive manufacturing program statements and arc starting points and arc stopping points, eliminates lap joints between tracks, and helps to improve the wire arc additive manufacturing efficiency andquality.

Description

technical field [0001] The present invention relates to additive manufacturing technology, in particular to a path planning method for arc additive manufacturing, which is suitable for the wire arc additive manufacturing (Wire Arc Additive Manufacturing, WAAM) process. Background technique [0002] Additive manufacturing technology is a new and rapidly developing manufacturing technology in recent years. The arc additive manufacturing technology is based on the traditional welding process, based on the three-dimensional model, relying on the arc as the heat source, relying on the machine tool, mechanical arm or other moving devices for spatial trajectory movement, according to the layered slicing and path planning procedures, through layer-by-layer melting deposition Wire forming structural parts. [0003] In the process of arc additive manufacturing, it is necessary to slice the model layer by layer, and plan the path of each slice section, and then use moving devices such...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/095B23K9/04B33Y10/00
CPCB23K9/0953B23K9/04B33Y10/00Y02P10/25
Inventor 苏江舟何智韩维群王志敏王殿政步贤政陈宏伟张铁军干建宁
Owner BEIJING HANGXING MACHINERY MFG CO LTD
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