Auxiliary support structure and application method thereof for laser selective forming of suspended plane

Abstract

The invention discloses an auxiliary support structure and an application method thereof for laser selective forming of a suspended plane and belongs to the technical field of additive manufacturing.The auxiliary support structure comprises at least one back-up block. A first supporting plane, a second supporting plane and a suspending plane are arranged on the back-up block. The first supportingplane is used for connecting a suspending plane of a product and supporting the suspending plane. The second supporting plane is used for connecting an inner surface of the product. The plane of thesuspending plane is crossing with the first supporting plane and the second supporting plane. Due to the suspending plane, the volume of the support structure can reduce more than 40%, the forming time of the auxiliary support structure is reduced, the volume of the row material is reduced. The cost of production is saved. Meanwhile, the probability of a partial disintegrate and collapse of the auxiliary support structure for laser selective forming of suspended surface in forming process are significantly reduced. The probability of wrapping and deforming is also significantly reduced. The qualified rate is improved.

Description

Technical field [0001] The invention relates to an auxiliary supporting structure used for laser selective melting and forming of a suspended surface and an application method thereof, belonging to the technical field of additive manufacturing. Background technique [0002] Laser selective melting forming technology (SLM for short) belongs to the field of metal additive manufacturing. It is a digital high-precision rapid manufacturing technology that has developed rapidly in the past decade. This technology converts a three-dimensional digital model into a two-dimensional graphic contour with the same slice thickness through laser layer-by-layer scanning, and deposits layer by layer into a product with the same structure as the three-dimensional model. It has the advantages of high forming precision and low sensitivity to the structure of the part. It is especially suitable for rapid and near net forming of small and medium size complex thin-walled products. [0003] The stability...

AI Technical Summary

Problems solved by technology

[0005] The existing auxiliary support runs through between the suspended surface and the bottom surface of the product, resulting in large volume and heavy weight of the auxiliary support

The large-volume auxiliary support has a large resistance to the powder spreading scraper, and the reaction force (shear force) of the powder spreading scraper to the auxiliary support is also large; especially when the support has a certain height, the shear resistance of the support is significantly reduced, making the forming The process is more unstable; at the same time, there are many defects inside the auxiliary support material, and the strength is relatively low. When the powder spreading scraper passes over the auxiliary support, under the dual action of shear force and pressure, the support is easy to crack and collapse

After the auxiliary support partially cracks and collapses, without affecting the continuous forming of the product, the surface of the suspended part is prone to roughness and serious slag hanging, which affects the dimensional accuracy of the formed product; Stunning and other phenomena, resulting in the product cannot be formed continuously, so that the SLM forming failure

In addition, forming a large-volume auxiliary support takes a long forming time, resulting in waste of time and raw materials

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