SLM (selective laser melting) method for processing horizontal suspended structure without longitudinal supports

A technology of vertical support and laser melting, which is applied in the direction of additive processing, process efficiency improvement, additive manufacturing, etc., can solve problems such as difficult processing, and achieve the effects of reducing production costs, enhancing capabilities, and simplifying processing and post-processing processes

Active Publication Date: 2019-10-25
INTELLIGENT MFG INST OF HFUT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the deficiencies of the above-mentioned prior art, and provides a selective laser melting method for processing a horizontal suspension structure without longitudinal support, so as to solve the problem that the flat top part of the current cavity structure is difficult to process

Method used

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  • SLM (selective laser melting) method for processing horizontal suspended structure without longitudinal supports
  • SLM (selective laser melting) method for processing horizontal suspended structure without longitudinal supports
  • SLM (selective laser melting) method for processing horizontal suspended structure without longitudinal supports

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] Example 1: Printing a large-span initial horizontal suspension layer

[0078] Such as figure 2 As shown, first, a small cuboid with a size of 40mm×2.5mm×4mm is printed on a stainless steel substrate 2 with a size of 50mm×50mm×6mm using conventional process parameters; then a small cuboid with a size of 70mm× 8mm first initial horizontal suspension layer 3 and a second initial horizontal suspension layer 4 with a size of 80mm×8mm; figure 2 Shown is the actual image of the large-span initial horizontal suspended layer after printing; the process parameters are: continuous laser output mode, laser power 40W, spot diameter 90-100μm, scanning speed 0.1m / s, scanning distance 65μm, layer thickness 30μm, The number of processing layers is 1 layer. This example shows that the method of the present invention can stably process an initial horizontal suspended layer with a large span and a certain mechanical strength.

Embodiment 2

[0079] Example 2: To print a cavity structure with an internal flat top of 40mm×20mm, proceed as follows

[0080] Step a, such as image 3 As shown, the back-shaped base is printed on a stainless steel substrate 2 with a size of 50mm×50mm×6mm using conventional process parameters, and the number of processing layers is 100; the outer size of the printing area is 45mm×25mm, the inner size is 40mm×20mm, and the wall thickness 2.5mm.

[0081] Step b, processing the initial layer of suspended flat top. The process parameters are set as follows: continuous laser output mode, laser power 40W, spot diameter 90-100μm, scanning speed 0.1m / s, scanning distance 65μm, layer thickness 30μm, processing layer 1 layer;

[0082] Step c, continue to process the two-layer back-shaped structure with the process parameters of step a

[0083] Step d, repairing the upper surface of the suspended layer is completed in three steps.

[0084] The first step: process parameters: continuous laser outp...

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Abstract

The invention discloses an SLM (selective laser melting) method for processing horizontal suspended structure without longitudinal supports. The method is characterized in that an initial layer, a repair layer and a conventional layer are sequentially formed; the initial layer is printed and formed by adopting a light spot in a defocused state in a scanning mode lower than the conventional rate, so that Plateau-Rayleigh instability occurs to each melt channel in the initial layer, and the initial layer with a specific texture structure is formed; the repair layer is printed and formed on the upper surface of the initial layer in a scanning mode higher than the conventional speed and in a continuous laser output mode by adopting a light spot in a focused state, and transition from transitional process parameters to conventional process parameters is completed within the set processing layer number; the conventional layer is printed on the upper surface of the repair layer by adopting conventional process parameters, and the horizontal suspended structure without longitudinal supports is formed. According to the method, the stable horizontal suspended structure is directly formed without the longitudinal supports, and the practical application of the SLM technology is effectively expanded.

Description

technical field [0001] The invention relates to the technical field of additive manufacturing, that is, 3D printing, in particular to a method for forming and processing a horizontal suspended structure in selective laser melting (Selective Laser Melting-SLM) processing of metal materials. Background technique [0002] Selective laser melting (SLM) is one of the mainstream technologies of metal additive manufacturing. Based on the concept of layered manufacturing, this technology obtains the corresponding processing data by establishing a digital model of the workpiece, layering the slices, and planning the path, and then uses the laser to melt the workpiece. Print out layer by layer. Selective laser melting (SLM) is different from the traditional cutting manufacturing process. In theory, its manufacturing process is not limited by the structure of metal parts, and can be widely used in aerospace, medical and automobile manufacturing and other fields. [0003] The suspended...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B33Y10/00
CPCB33Y10/00B22F10/00B22F10/36B22F10/366B22F10/385B22F10/28B22F12/43B33Y50/02Y02P10/25B22F2301/35B22F2998/10
Inventor 支辛蕾袁自钧陈向东闫昭华
Owner INTELLIGENT MFG INST OF HFUT
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