关于L形形环的空腔填充缺陷和拉伸性质的研究
Tiewen Hao1,2,3, Junzhe Chen1,2, Tao Zhang1,2
1Light Alloy Research Institute, Central South University, Changsha 410083, China.
Materials (Basel, Switzerland)
|October 16, 2024
概括
这项研究引入了一种新的C形环法,可以同时生产两个L形环,克服不对称成型的缺陷. 优化的参数确保L形环具有高的几何精度和均的机械性能.
科学领域:
- 材料科学 材料科学 材料科学
- 制造业 工程 制造工程
- 机械工程 机械工程
背景情况:
- 由于不对称的几何形状,形成L型配置环具有挑战性,导致缺陷和不良机械性能.
- 现有的方法难以整合形成复杂的配置文件,如L形环.
研究的目的:
- 提出一种新的制方法,同时从一个C形环中生产两个对称的L形环.
- 研究和优化制参数,以最大限度地减少缺陷并提高L形环的质量.
主要方法:
- 开发C字形环的数值模型,以分析空腔填充和几何精度.
- 系统地调查滚动参数 (槽深比,槽角,滚动比) 对成型缺陷的影响.
- 应用Box-Behnken优化方法来实现滚动稳定性和环质量的多目标优化.
- 实验验证优化滚动过程的实验验证.
主要成果:
- 形成缺陷随着槽深比增加而增加,随着槽角和滚动比减少而减少.
- 一个恒定的环生长速度的养策略可以获得最佳的几何精度和应变均性.
- 通过Box-Behnken方法确定的优化参数,导致C形环的成功实验准备.
- 由此产生的C形环呈现出对称和均的硬度分布,但与造空白保持着与造空白相比的抗拉性质的异构性,热处理的改善最小.
结论:
- 这种新的C形环法有效地解决了形成L形环的挑战.
- 优化的滚动参数对于实现高质量的L形环与最小缺陷至关重要.
- 虽然几何精度和硬度得到了改进,但造材料固有的异质性仍然是影响拉伸性能的一个因素.
更多相关视频
相关概念视频
01:10Deformation in a Circular Shaft
267
One of the distinctive characteristics of circular shafts is their ability to maintain their cross-sectional integrity under torsion. In other words, each cross-section continues to exist as a flat, unaltered entity, simply rotating like a solid, rigid slab. To understand the distribution of shearing stress within such a shaft, consider a cylindrical section inside this circular shaft. This section has a length of L and a radius of R, with one end fixed. The radius of the cylindrical section is...
267
01:18Stress Concentrations in Circular Shafts
165
Consider the elastic torsion formula, which applies to a circular shaft with a consistent cross-section. This formula assumes that the shaft's ends are loaded with rigid plates firmly attached. However, in many cases, torques are applied to the shaft through mechanisms like flange couplings or gears, which are connected by keys inserted into keyways. This application method modifies the stress distribution near the point of torque application, causing it to deviate from the distributions...
165
01:10Residual Stresses in Circular Shafts
165
In materials that exhibit elastic and plastic behavior, known as elastoplastic materials, residual stresses can accumulate when these materials experience plastic deformation. This deformation arises from either high levels of shearing stress or significant strains. Residual stresses are internal stresses that persist within a material after removing the external force causing deformation. This phenomenon is demonstrated when observing the behavior of a shaft under torque; notably, the...
165
01:20Plastic Deformation in Circular Shafts
181
When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...
181
01:15Thin-Walled Hollow Shafts
170
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...
170
01:18Deformations in a Symmetric Member in Bending
163
When analyzing the deformation of a symmetric prismatic member subjected to bending by equal and opposite couples, it becomes clear that as the member bends, the originally straight lines on its wider faces curve into circular arcs, with a constant radius centered at a point known as Point C. This phenomenon helps to understand the stress and strain distribution within the member more clearly.
When the member is segmented into tiny cubic elements, it is observed that the primary stress...
When the member is segmented into tiny cubic elements, it is observed that the primary stress...
163