摊铺机熨平板焊接模拟仿真与工艺优化

发布时间：2018-05-08 17:13

本文选题：熨平板 + 焊接仿真　；参考：《长安大学》2014年硕士论文

【摘要】：熨平板作为摊铺机的关键部件，其变形和应力会对后续的加工、装配及功能的实现产生重要影响。本论文从熨平板的三维建模出发，通过前处理设置了焊接参数、简化了模型、对模型进行网格划分及工装卡具设置，后续对熨平板局部模型进行焊接仿真模拟，，验证在设置的参数条件下，模拟仿真结果与实际情况的差异。在仿真后处理阶段对焊接参数进行了设置，将熨平板局部简化为T型接头，进行网格划分及热源模拟后，求解其应力和变形的分布情况；其后对焊接约束和焊接顺序进行了优化，分别讨论了三点式约束、翻转前后约束及焊接顺序对变形和应力的影响，针对焊接残余应力比较了热时效和振动时效在去应力效果上的差别，最后对优化过的焊接方案进行变形和应力的验证，得出以下结论：（1）通过模型构建及相应边界条件设置，分析在该条件下，仿真结果与实际情况的差异，结果表明焊接变形的差异率在23%，焊接应力的差异率在36%，焊接变形的差异率在可接受的范围，焊接应力的差异率略显偏大，原因在于误差累计的结果。（2）通过T型接头简化，焊接参数设计，对仿真结果进行分析后认为，焊接电流对变形和应力的影响较大，电压的影响较小，为获得较小的变形量和较低的焊接残余应力应选用较小的焊接电流。（3）通过对三点式约束和翻转前后约束的仿真，翻转前后约束对变形的影响不大，而三点式约束对变形有较大影响（4）在三点式约束条件下，通过焊接顺序的优化设计，可以有效的控制变形量。（5）通过热时效和振动时效的效果对比验证，在去应力效果方面，热时效比振动时效略好，但从成本、生产周期等角度考虑选择振动时效作为去应力的方式。（6）通过焊接方案的优化设计，并对设计结果进行模拟后，有效的降低了变形和内应力，经过验证试验结果与模拟基本吻合。
[Abstract]:The ironing plate is the key component of the paver, its deformation and stress will have an important influence on the subsequent processing, assembly and function realization. In this paper, the welding parameters are set up through the pretreatment of the ironing plate, the model is simplified, the model is divided and the fixture is set, and the subsequent local model of the ironing plate is made. The welding simulation is carried out to verify the difference between the simulation results and the actual conditions under the set parameters.
The welding parameters were set in the post processing stage, and the ironing plate was partially simplified as T type joint. After grid division and heat source simulation, the distribution of stress and deformation was solved. After that, the welding constraints and welding sequence were optimized. The three point constraint, the constraint before and after the flipping and the welding sequence were discussed respectively. With the influence of stress, the difference between thermal aging and vibration aging is compared with the residual stress of welding. Finally, the deformation and stress of the optimized welding scheme are verified, and the following conclusions are drawn:
(1) through the model construction and the corresponding boundary condition setting, the difference between the simulation results and the actual situation is analyzed under this condition. The results show that the difference rate of welding deformation is 23%, the difference rate of welding stress is 36%, the difference rate of welding deformation is acceptable and the difference rate of welding stress is slightly larger, the reason is the result of accumulative error.
(2) through the simplification of the T type joint, the design of welding parameters and the analysis of the simulation results, it is believed that the welding current has great influence on the deformation and stress, the influence of the voltage is small, and the smaller welding current should be selected to obtain the smaller deformation amount and the lower welding residual stress.
(3) through the simulation of the three point constraint and the front and rear restraint, the influence of the front and rear constraints has little effect on the deformation, while the three point constraint has a great influence on the deformation.
(4) under the three point constraint condition, the optimal design of welding sequence can effectively control the deformation.
(5) through the comparison of the effect of thermal aging and vibration aging, it is proved that the thermal aging is better than that of vibration aging in the effect of stress removal, but the choice of vibration aging as the way of stress removal is considered from the angle of cost and production cycle.
(6) through the optimization design of the welding scheme and the simulation of the design results, the deformation and internal stress are effectively reduced, and the test results are basically consistent with the simulation.

【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U415.521

【参考文献】