- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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Fabrication of fine wires using direct laser melting process
摘要： With the rapid development of micro electro-mechanical-systems and micro system technology, parts made of micro-wire are widely applied in biomedical, automotive, and consumer electronics. Therefore, the manufacturing of micro-wire has played an important role in manufacturing micro parts. However, when dimensions of metal parts downscale to micro scale, the plastic deformation behaviors and thermal properties which dependent on the specimen size are different from those in the macro scale, and size effects occur. The direct laser melting process can directly build full-density, high-performance, complex metal parts by melting metal powder with laser scanning. This study investigated the direct laser melting method to fabricate fine linear-bead that can be potentially substituted for micro-wire has been investigated. Laser process parameters, such as laser power, laser scanning speed, powder grain size and powder layer thickness were found to be an important variable affecting shape of linear-bead. Surface shape and cross-sectional properties were analyzed using microscope and hardness tester.
关键词： Direct laser melting (DLM),Linear-bead,Hardness,Roundness
更新于2025-09-12 10:27:22
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Investigation of the Profile of Laser Bends with Variable Scan Distance
摘要： Laser forming is a process capable of bending sheet metal only with the laser beam and without a physical interaction with the part. The part is formed by small and local deformations by the laser beam and it is done in increments with each pass of the laser. This incremental forming makes it difficult to ensure a smooth deformation field, which can result in non-smooth components and difficulties in achieving the required tolerance of the bends. This work presents an experimental investigation of the effect of varying the scan distance, number of passes per scan line and number of scan lines on the profile of a v-bend. The v-bends were measured on both sides by a laser range scanner to determine the surface profile along the bend. To evaluate the quality of the v-bend and define the profile as discrete or continuous, the bend roundness was evaluated manually and automatically by a Least Squares Circles method and by using second order differentiation method. The effect of varying the scan distance was tested experimentally on five samples with 16 mm and five samples with 20 mm bend length. The parts were subsequently evaluated on both the inside and outside of the bend and the bend angle was measured. The results show good correlation between the manual inspection and the automatic examination. The results show that the overlapping of the laser beam paths is required to create a continuous smooth bend.
关键词： Roundness error,Laser forming,Sheet metal bending,Profile scanning
更新于2025-09-12 10:27:22