用负角切割机切割圆形钢条的二维有限元素分析和切割力模型:计算芯片积累效应
Shifan Qiao1, Chaobo Feng1, Gang Wang2,3
1School of Civil Engineering, Central South University, Changsha 410075, China.
Materials (Basel, Switzerland)
|March 27, 2025
概括
这项研究模拟了屏蔽道挖掘过程中钢条的切削力,发现芯片积累显著影响水平力. 开发的模型有助于预测建筑应用中的力.
科学领域:
- 机械工程 机械工程
- 材料科学 材料科学 材料科学
- 土木工程 土木工程是指土木工程.
背景情况:
- 钢条上的切削力对于盾牌道的开采至关重要,特别是在遇到堆基础时.
- 了解初始切割相位力对于优化道参数至关重要.
研究的目的:
- 开发一个计算模型来预测初始直角切割阶段钢条的切割力.
- 为了研究材料特性,拉伸率和温度对切削力的影响.
- 分析芯片积累和滑动线应力变化对力预测的影响.
主要方法:
- 使用2D有限元素分析 (FEA) 模拟正交切割与负角切割机.
- 结合了滑动线理论和剪带模型来计算力.
- 纳入了约翰逊-库克材料模型,以计算拉伸率和温度效应.
- 研究的常见建筑钢材:AISI 1040,AISI 4340和AISI 304. 这些钢材均为常见建筑钢.
主要成果:
- 开发了一种模型来计算钢条上的负角切割机的切割力.
- 与FEA模拟相比,水平切削力模型预测的平均误差为14.23%.
- 垂直切削力计算显示出更高的误差,平均为14.06%.
- 芯片积累被确定为影响水平切割力的重要因素.
结论:
- 开发的计算模型提供了宝贵的见解切削力在钢条切削的初始阶段.
- 材料特性,温度,摩擦和条半径影响模型的准确性.
- 需要进一步细化垂直力预测的准确性,但该模型为道参数优化提供了基础.
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