Selective laser sintering hybrid milling (SHM) is an advanced manufacturing process that combines the advantages of both metal powder bed fusion and milling. Using this technology, extremely complex products can be fabricated with high accuracy and reasonable surface quality. SHM has enormous potential in the application of mold fabrication; molds with free-form inner cooling channels can be produced with this technology. The key feature of this technology is that milling is conducted not only after, but also during the forming process. However, this leads to the issue that although machined layers of products have a high level of accuracy without thermal deformation, the addition of new layers causes the materials to undergo shrinkage and deformations to occur on their machined layers. The dimensional error due to shrinkage significantly affects to the accuracy of SHM process; therefore, a completely understanding of the formation error due to shrinkage is highly important in developing efficient solutions. In this study, shrinkage deformation is observed in detail through the results of simulation using finite element analysis. Three shrinkage rules and the unclamping effect are proposed to completely explain the shrinkage error shape in SHM. Finally, an experiment is conducted to confirm the final result of shrinkage.

选择性激光烧结混合铣削（SHM）是一种先进的制造工艺，结合了金属粉末床熔化和铣削的优点。使用这项技术，可以制造出非常复杂的产品，并具有高精度和合理的表面质量。SHM在模具制造的应用中具有巨大的潜力；可以使用此技术生产具有自由形式的内部冷却通道的模具。该技术的关键特征在于，不仅在成型之后，而且还在成型过程中进行铣削。然而，这导致了一个问题，尽管产品的机加工层具有很高的精度而没有热变形，但是添加新的层会导致材料在其机加工层上发生收缩和变形。收缩引起的尺寸误差显着影响SHM工艺的精度；因此，在开发有效的解决方案时，完全了解由于收缩引起的地层误差非常重要。在这项研究中，通过使用有限元分析的模拟结果详细观察了收缩变形。提出了三种收缩规律和松驰效果，以完全解释SHM中的收缩误差形状。最后，进行实验以确认收缩的最终结果。提出了三种收缩规律和松驰效果，以完全解释SHM中的收缩误差形状。最后，进行实验以确认收缩的最终结果。提出了三种收缩规律和松驰效果，以完全解释SHM中的收缩误差形状。最后，进行实验以确认收缩的最终结果。