共查询到20条相似文献,搜索用时 78 毫秒
1.
以某输送机刮板为研究对象,建立有限元模型,分析该锻件成形过程中的零件温度场、模具温度场以及成形载荷等因素的影响,并应用Archard磨损模型分析了模具复杂多因素耦合情况下的磨损情况,预测了单次磨损的深度分布,并得出单次磨损最大深度0.00510mm,为优化模具设计、提高模具寿命提供了理论依据。 相似文献
2.
铝合金拉杆复合挤压工艺模具磨损分析 总被引:1,自引:0,他引:1
依据Arehard磨损模型,分析了某铝合金拉杆复合挤压过程中坯料和模具的热传递、摩擦生热、变形生热等多因素耦合下的模具温度和磨损分布.利用有限元软件,分析了不同挤压速度、润滑条件以及模具预热温度条件下,模具单次最大磨损深度的分布规律,这能为预测模具寿命提供指导. 相似文献
3.
4.
5.
斜齿圆柱齿轮旋转精冲过程模具磨损模拟分析 总被引:1,自引:0,他引:1
在Deform-3D软件平台上建立了斜齿圆柱齿轮旋转精冲成形三维刚塑性有限元模型.基于Archard磨损模型对精冲过程进行了凹模模具磨损分析,得到了模具工作表面各点的磨损分布,确定了最大磨损发生区域,并与直齿圆柱齿轮精冲模具磨损进行了对比分析.通过单因素变量法,研究了反顶力、压边力、冲裁速度、凸凹模间隙、凹模圆角半径以及凹模初始硬度对模具磨损的影响关系.研究结果表明,磨损模型能准确预测旋转精冲过程中主要工艺参数与磨损之间关系,并从工艺设计方面提出了减小模具磨损的措施. 相似文献
6.
7.
8.
9.
10.
11.
基于修正的Archard磨损模型,对G3镍基合金热挤压成形工艺中挤压模具磨损行为进行了有限元分析。采用BP神经网络建立热挤压模具形状和磨损深度的映射关系。以模具表面磨损深度均匀分布为目标,结合遗传算法(genetic algorithm, GA),提出了一种集三者为一体的G3镍基合金热挤压模具型腔优化设计方法。计算结果表明,模具型腔经过优化后,最大磨损深度值降低约30%,磨损深度沿锥模表面分布更均匀,表明这种优化设计方法可以提高挤压模具的耐磨性能和使用寿命 相似文献
12.
13.
移动热源作用下电火花线切割加工电极丝三维温度场模拟 总被引:2,自引:0,他引:2
往复走丝和“中走丝”电火花线切割机床是中国独创的电加工设备,在模具制造等行业发挥着重要作用.由于其电极丝是重复使用的,因此电极丝损耗是普遍存在的问题.在电极丝与工件之间相对运动的情况下,建立了移动热源条件下的电极丝传热模型,通过有限元分析对单脉冲放电条件下电极丝表面温度场进行了三维仿真,发现当走丝速度增加时电极丝熔融区... 相似文献
14.
挤杆工序是GH4169合金叶片热成形的首道工序,作为制坯工序,其不但要保证精确的尺寸形状,还要确保工件组织达到工艺要求。模具的工况严重地影响了工件的内在质量。基于Archard磨损理论,以凹模为研究对象,采用Deform-2D有限元软件对其磨损过程进行数值模拟,通过分析工件的模具温度、模具硬度、挤杆速度、摩擦系数、凹模圆角半径等工艺与模具参数对凹模磨损的影响,获得了相关因素对凹模磨损的影响规律;采用磨损量累计,按工艺要求以最大磨损量0.2 mm对凹模寿命进行预测。结果表明:采用有限元模拟挤杆过程,分析模具受力和磨损情况及其对工件质量的影响,进而优化模具设计和工艺参数,在提高工件质量的同时,延长了模具寿命,降低了生产成本。 相似文献
15.
有限元分析结论表明锭模应力场与温度场存在明显的对应关系。本文借助该关系提出了用温度场分析锭模寿命的简便方法,并据此分析了锭模结构对锭模寿命的影响。 相似文献
16.
P. A. Kobryn S. L. Semiatin R. Shivpuri 《Journal of Materials Engineering and Performance》2001,10(3):290-298
Mold wear during the casting of Ti-6Al-4V in a permanent (steel) mold was investigated using a combination of macro- and micro-scale
observations and measurements. For this purpose, a steel mold with interchangeable inserts of three candidate mold steels
(H13, P20, and 1040) was used. Inserts were removed at regular intervals during casting under prototype-production conditions
and inspected to assess mold wear. Two major mold wear types were identified: soldering and “wrinkling.” Soldering was concluded
to be a result of local over-heating of the mold, and wrinkling a result of cyclic stresses caused by a combination of solid-state
phase transformations and large temperature gradients. The 1040 inserts performed the best; soldering was less severe and
wrinkling did not occur. The better performance of the 1040 inserts was attributed to lower mold temperatures and thermal
gradients due to the higher thermal conductivity of 1040 relative to H13 or P20. 相似文献
17.
The tool flank begins to wear out as soon as cutting process proceeds. Cutting parameters such as cutting forces and cutting temperature will vary with increasing degree of flank wear. In order to reveal the relationship between them, the theoretical situations of cutting process were analyzed considering the tool flank wear effect. The variation rules of cutting force, residual stress and temperature distributions along with the tool flank wear were analyzed comparing with the sharp tool tip. Through FEM simulation method, affections of the tool flank wear value VB on cutting forces, residual stress and temperature distributions were analyzed. A special result in this simulation is that the thrust force is more sensitive to tool flank wear, which can be used as a recognition method of tool condition monitoring. The FEM simulation analysis result agrees well with the experimental measuring data in public literatures and some experiments made also by the authors. 相似文献
18.
19.
20.
连铸结晶器内热-力耦合状态有限元模拟 总被引:8,自引:0,他引:8
针对碳钢在连铸结晶器内的凝固过程,考虑铸坯和钢板间接触状态,建立了完全热力耦合的二维非稳态有限元模型,利用MARC软件在微机上求解。模拟出了结晶器区域热和力学状态,包括铸坯温度场,包括铸坯温度场,应力场,铸坯-钢板界面热流和气隙分布规律等,本模拟工作可为优化结晶器锥度、开发高拉速曲面结晶器提供理论依据和技术基础。 相似文献