Method for in-situ growth of auxiliary support structure

An auxiliary support and in-situ generation technology, applied in the direction of improving process efficiency, improving energy efficiency, and additive processing, can solve the problems of wasting raw materials and reducing product forming efficiency, so as to improve forming efficiency, improve product forming efficiency, The effect of saving raw materials

Active Publication Date: 2017-03-29
CAPITAL AEROSPACE MACHINERY +1
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Problems solved by technology

The addition of auxiliary support structures not only wa...

Method used

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Embodiment Construction

[0031] In the following, in conjunction with specific examples, taking the laser selective melting forming GH4169 superalloy cantilever product as an example, the process method of in-situ generating auxiliary support structure will be described in detail:

[0032] The invention provides a method for generating an auxiliary supporting structure in situ, which is suitable for the laser selective melting forming technology. The powder layer in a loose state is melted by a high-energy laser, and a high-density structure is formed by layer-by-layer powder spreading and layer-by-layer melting accumulation. Density of three-dimensional parts, when forming a cantilever structure with a large inclination angle, the cantilever structure is stabilized by adding an auxiliary support structure; including the following steps:

[0033] (1) Determine the design principles of auxiliary support

[0034] (1.1) According to the structural characteristics of the product, design the auxiliary supp...

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Abstract

The invention belongs to the technical field of laser added material manufacturing, and in particular, relates to a method for in-situ growth of an auxiliary support structure. The method adopts a zoning scanning mode to machine a product and an auxiliary support; the product is machined by normal high-power density parameters; and the auxiliary support is machined by gradual increasing process parameters: the low-power density is used for bottoming, so that a first layer of powder forms weak combination as a substrate of several subsequent layers; and the power density of the several subsequent layers is gradually increased until the normal power density is reached. As the method breaks through growth of the auxiliary support only from the substrate, and realizes in-situ growth of the auxiliary support, the waste of powder raw materials can be reduced, meanwhile, the laser machining time is shortened, and the product forming efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of laser additive manufacturing, and in particular relates to a method for generating an auxiliary supporting structure in situ. Background technique [0002] Selective Laser Melting (SLM for short) technology belongs to the field of laser additive manufacturing. It adopts high-energy laser to melt thin powder layers in a loose state. Density of 3D parts. This technology can theoretically form products of any complex shape, but since the powder layer is in a loose state, when forming a cantilever structure with a relatively large inclination angle, if there is not enough physical support under the loose powder layer, it is easy to collapse under the action of the laser, affecting Stability of the forming process. [0003] In order to solve the above problems, the existing technical solutions generally stabilize the cantilever by adding an auxiliary support structure. The auxiliary support generally needs t...

Claims

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Application Information

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IPC IPC(8): B22F3/105B33Y30/00
CPCY02P10/25
Inventor 王国庆陈济轮梁晓康严振宇黄超田彩兰侯谊飞王华斌
Owner CAPITAL AEROSPACE MACHINERY
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