相关实验视频
Updated: Jul 18, 2025

08:43
Fused Filament Fabrication FFF of Metal-Ceramic Components
Published on: January 11, 2019
17.3K
通过激光粉末床融合生产的薄壁零件的支移除
Qiqiang Cao1, Yuchao Bai1, Zhongpeng Zheng2
1Department of Mechanical Engineering, Faculty of Engineering, National University of Singapore, Singapore, Singapore.
3D printing and additive manufacturing
|August 23, 2023
概括
在激光粉床聚变 (LPBF) 中有效地去除支对于薄壁部件至关重要. 添加树脂显著降低了切削力,并防止在拆除支结构时的折曲.
科学领域:
- 增材制造 增材制造 增材制造
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
背景情况:
- 在薄壁部件的激光粉床融合 (LPBF) 中,支持的移除是一个关键的挑战.
- 薄壁部件的加工敏感性使有效和安全的支结构移除变得复杂.
- 了解支移除过程中的材料反应是提高表面质量的关键.
研究的目的:
- 调查LPBF薄壁零件中支移除的机制.
- 评估切割参数对加工能力的影响.
- 提出和验证一种新的解决方案,以提高支的可加工性.
主要方法:
- 切削力,表面形态和偏移的实验研究.
- 分析不同厚度和切割深度的薄壁部件.
- 模拟有限元法 (FEM) 模拟以阐明移除机制.
- 建议并测试一种添加剂树脂溶液,以提高可加工性.
主要成果:
- 由于支结构倾斜和崩,切割力增加.
- 表面形态随着样品厚度的增加而改善,但随着切割深度的增加而退化.
- 拟议的树脂添加减少了z方向切削力72.6% (0.3mm) 和64.6% (0.4mm).
- 在用树脂溶液去除支架后,没有观察到样品的偏斜.
结论:
- 支持移除机制涉及由于结构不稳定而导致逐渐增加的切削力.
- 样品厚度和切割深度显著影响表面质量和可加工性.
- 添加树脂是一种有效的解决方案,可以提高支的加工能力,降低力,并防止LPBF部件的曲折.
相关概念视频
Thin-Walled Hollow Shafts
211
In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution...
211
Unsymmetric Loading of Thin-Walled Members: Problem Solving
132
The shear center of a channel section with uniform thickness, height, and width, is determined by computing the shear force in the member and calculating the moments of inertia of the sections.
To compute the shear forces, find the shear flow at a specific distance from the endpoint using the vertical shear and the moment of inertia values. The total shear force on the flange is calculated by integrating the shear flow from one end of the flange to the other.
Next, calculate the moments of...
To compute the shear forces, find the shear flow at a specific distance from the endpoint using the vertical shear and the moment of inertia values. The total shear force on the flange is calculated by integrating the shear flow from one end of the flange to the other.
Next, calculate the moments of...
132
Unsymmetric Loading of Thin-Walled Members
133
Thin-walled members with non-symmetrical cross-sections are vital to engineering structures, offering material efficiency and structural integrity. However, unsymmetrical loading on these members leads to complex stress distributions, resulting in simultaneous bending and twisting can cause deformation or structural failure. The interaction between bending and twisting requires detailed analysis to ensure structural resilience.
The concept of the shear center is crucial in countering the...
The concept of the shear center is crucial in countering the...
133

