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Wire arc additive manufacturing method, device and equipment for continuous growth of curved surface metal structure and computer storage medium

A metal structure and additive manufacturing technology, applied in the field of additive manufacturing, can solve the problems that one-time printing is difficult to achieve, affect the structure and performance of the workpiece, and the surface roughness of the workpiece is high, so as to shorten the development cycle, improve efficiency, and process technical procedures. reduced effect

Active Publication Date: 2021-05-28
NANJING ENIGMA IND AUTOMATION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The curved metal structure is a complex part with a suspended structure. If additive manufacturing is carried out, it is inevitable to add support structures and remove them after printing. This method increases both material costs and time costs. Affect the structure and performance of the workpiece
If no support is added, the existing electric arc additive manufacturing technology can only print curved metal structures through manual teaching robots. The printing cycle is long, and the surface roughness of the workpiece is high, so it is difficult to achieve one-time printing.

Method used

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  • Wire arc additive manufacturing method, device and equipment for continuous growth of curved surface metal structure and computer storage medium
  • Wire arc additive manufacturing method, device and equipment for continuous growth of curved surface metal structure and computer storage medium
  • Wire arc additive manufacturing method, device and equipment for continuous growth of curved surface metal structure and computer storage medium

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] This embodiment proposes an arc additive manufacturing method for continuous growth of curved metal structures, the steps are as follows:

[0071] Step 1. Select the welding wire and substrate required to form a specific metal structure;

[0072] The process of selecting the wire and base plate required to form a particular metal structure is further:

[0073] Step 1-1. Determine the process parameters required to form a specific metal structure, including welding procedures, wire feeding speed, printing speed, slice layer height, type of shielding gas and flow rate. The relationship between each parameter is as follows:

[0074] V×F=v×f

[0075] In the formula, V represents the welding speed, F represents the cross-sectional area of ​​the weld, v represents the wire feeding speed, and f represents the cross-sectional area of ​​the welding wire; step 1-2, the weld cross-section of the workpiece is equivalent to a rectangle, and the following relationship is satisfied a...

Embodiment 2

[0089] On the basis of Embodiment 1, the process of generating the spiral + swing continuous ascending slice path is as follows: perform slice processing on the model of the workpiece to be printed, take any direction perpendicular to its rotary axis as the normal direction, and establish a tangent plane passing through the rotary axis . Rotate the tangent plane around the rotary axis, set the rotation angle θ each time, and intersect the tangent plane with the workpiece to obtain the slice profile of the model. When the cutting plane is rotated 360° around the rotation axis, all slice contour data of the model are obtained. Divide the extracted surface profile into several small straight line segments, and use cylinder fitting method to extract the central axis for each segmented area. Find the central axis of the slice contour data, divide the obtained surface contour data into small areas, perform least square cylindrical surface fitting on the next small area, and use the...

Embodiment 3

[0091] Ideally, the distances from the surface points to the axis of rotation should be equal in the small area of ​​the surface contour, but in fact there is a small deviation (d 1 ≠ d 2 ≠ d 3 ≠ d 4 ), so the position of the central axis in the straight line segment is adjusted to meet the minimum distance deviation from each point in the small area of ​​the surface contour to the central axis.

[0092] The cylindrical surface can be considered as a collection of points at a certain distance R from the central axis, which can be represented by 7 parameters, which are the central axis positioning point O(x 0 ,y 0 ,z 0 ), the central axis direction vector n 0 (a 0 ,b 0 ,c 0 ) and cylinder radius R; define the measuring point as p i (x i ,y i ,z i ), p′ i for p i Projection on the central axis, the connection line between the projection of the measuring point to the central axis and the measuring point is R 0 , the cylindrical surface expression is:

[0093]

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Abstract

The invention provides a wire arc additive manufacturing method and system for continuous growth of a curved surface metal structure. The method comprises the following steps: selecting a welding wire and a base plate needed for forming a specific metal structure; generating a spiral and swinging continuous rising slice path; driving a welding gun by a robot to move according to the generated spiral and swinging continuous rising path; and enabling a positioner to cooperate with the robot to work through rotation and overturning. The system comprises a base assembly, a path generation module, an eight-axis linkage mechanism and a visual sensing module, wherein the base assembly is used for placing a specific metal structural member; the path generation module is used for generating the spiral and swinging continuous rising slice path; the eight-axis linkage mechanism (comprising a six-axis robot and a double-axis positioner) is used for tracking and printing according to the spiral and swinging continuous rising slice path generated by the path generation module; and the visual sensing module is used for monitoring a printed workpiece in real time. According to the method and system, the bottleneck that continuous wire arc additive manufacturing of an existing curved surface metal structural part is difficult is solved, the product development period is shortened, and the efficiency is improved.

Description

technical field [0001] The invention relates to an arc additive manufacturing method and system for continuous growth of curved metal structures, and relates to the field of additive manufacturing. Background technique [0002] Arc Additive Manufacturing (Wire Arc Additive Manufacture, WAAM) is a method that uses an arc or plasma arc as a heat source to melt metal welding wire, and adopts the principle of layer-by-layer cladding under the control of a program or software. It is an advanced digital manufacturing technology that produces a three-dimensional metal blank that is close to the product shape and size requirements. The parts formed by the arc additive manufacturing technology are composed of full-weld metal, with uniform chemical composition and high density. The free forming environment has almost no restrictions on the size of the parts, and the forming efficiency can reach several Kg / h. [0003] The curved metal structure is a complex part with a suspended struc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/04B33Y10/00B33Y30/00
CPCB23K9/04B33Y10/00B33Y30/00
Inventor 董巍汤洪淝程远
Owner NANJING ENIGMA IND AUTOMATION TECH CO LTD
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