流道截面与增材制造加工工艺参数对液压集成块成型质量的影响

液压系统广泛应用于工程领域,提高功率密度是其重要发展方向,其中液压集成块轻量化设计是提高功率密度的有效手段。通过增材制造(AM)灵活的加工特性能使集成块重量降低,是高功率密度液压驱动的一种有效的设计方法,但目前增材制造加工的流道存在塌陷形变、尺寸精度低、内部流道粗糙度高等问题。以提升增材制造流道成型质量为研究目标,选区激光熔融(SLM)为加工方法,探讨流道横截面及打印模型中有无支撑添加对成型质量的影响,并通过非接触测量对打印模型内部流道尺寸进行测量得到定量分析。结果表明,对于圆形流道,有支撑结构有较好的打印结果,菱形流道形变量小于圆形流道。进一步通过改变打印参数对内流道表面质量进行研究,结果显示适当选择工艺参数可以提高表面质量。

Effects of Cross-section and Process Parameters on Build Quality of Hydraulic Manifold Using Additive Manufacturing

Hydraulic system is widely used in the engineering field and increasing mass-to-power ratio is an urgent requirement for wider application. As a part of hydraulic system, the mass reduction of the hydraulic manifold using Additive Manufacturing (AM) is an effective way to achieve this goal. However, there are many problems in the manufacturing process, such as deformation, low dimensional accuracy and high roughness of the internal channel. To improve the build quality of the channel in additive manufacturing, this paper uses Selective Laser Melting (SLM) to manufacture channel prototypes and investigate how the cross-section and process parameters influence the build quality quantitively. The dimensional accuracy is obtained by comparing the scanned model with the designed CAD model, while the circular channels with and without support structures are manufactured as a reference. To investigate the internal channel surfaces, non-destructive roughness measurement is performed. The results show that the diamond-shaped cross-section would promise less deformation in interior channels compared to the circular ones, and the surface roughness can be enhanced by proper process parameters.