钢管冷拔模具磨损失效分析及再制造研究

发布时间：2018-03-09 14:06

本文选题：冷拔模具　切入点：磨损失效　出处：《燕山大学》2015年硕士论文　论文类型：学位论文

【摘要】：钢管冷拔模具作为钢管冷拔作业的核心部件,在管坯剧烈的塑性变形过程中受到复杂力的作用,同时管坯塑变放热和摩擦生热,钢管冷拔模具的磨损消耗量非常巨大。钢管冷拔模具作为钢管冷拔工艺中的易消耗件,对冷拔钢管的产量、质量和成本有着巨大影响,因此要实现钢管冷拔行业的可持续发展,如何降低钢管冷拔模具的磨损消耗,对磨损失效的模具实行再制造修复,延长钢管冷拔模具的使用寿命等成为国内外各相关厂家及科研院所面临的重要课题。本文着重从数值模拟和实验的角度展开对钢管冷拔模具的失效分析和再制造修复研究,主要内容如下:采用DEFORM数值模拟软件对钢管冷拔过程进行了模拟分析,求得钢管冷拔模具在冷拔过程中的温度场和应力场,分析了冷拔过程中拉拔力、模具温度、模具应力、模具磨损量等模拟结果的变化及分布情况,并得出模具失效的主要原因、形式和失效位置,为钢管冷拔模具的修复与再制造研究打下了基础。根据熔覆合金粉末的设计原则和模具材料的性质,设计了M-1、M-2两种镍基复合合金粉末作为磨损失效钢管冷拔模具再制造修复备用粉末,同时研究了熔覆效果的控制方法。将设计的两种熔覆合金粉末在切取的基材试板上分别进行了激光熔覆和等离子熔覆实验研究,根据熔覆经验及粉末与设备的特性确定了相应的激光及等离子熔覆工艺参数。观察了熔覆过程中的熔覆现象,并对激光熔覆及等离子熔覆的热影响进行了对比分析。对熔覆实验制得的四种熔覆层进行了显微硬度、拉伸性能、冲击韧性和摩擦磨损性能对比实验及金相组织观察。通过对实验结果的分析对比,发现激光熔覆M-1复合合金粉末所制得熔覆层力学性能、耐磨性能最佳,且熔覆层与基材有着良好的冶金结合,满足钢管冷拔模具的再制造修复要求。在失效的钢管冷拔模具上进行了激光熔覆M-1复合合金粉末的再制造修复实践,经宏观观察及无损探伤未发现裂纹缩孔等缺陷,进一步验证了激光熔覆M-1复合合金粉末修复钢管冷拔模具的可行性。
[Abstract]:As the core part of the cold drawing operation of steel tube, the cold drawing die of steel tube is subjected to complex force in the course of severe plastic deformation of the tube billet. At the same time, the plastic deformation and friction heat generation of the tube billet. The wear consumption of steel tube cold drawing die is very great. As a consumable part of steel tube cold drawing process, the steel tube cold drawing die has a great influence on the output, quality and cost of cold drawn steel pipe, so it is necessary to realize the sustainable development of steel tube cold drawing industry. How to reduce the wear consumption of steel tube cold drawing die, and how to remanufacture and repair the worn die. Prolonging the service life of steel tube cold drawing die has become an important subject for domestic and foreign manufacturers and scientific research institutes. This paper focuses on the research on failure analysis and remanufacturing repair of steel tube cold drawing die from the point of view of numerical simulation and experiment. The main contents are as follows: the process of cold drawing of steel tube is simulated and analyzed by DEFORM software, the temperature field and stress field of steel tube cold drawing die are obtained, and the drawing force, die temperature and die stress are analyzed. The variation and distribution of the simulation results, such as the wear quantity of the mould, and the main reasons, forms and failure locations of the mould failure are obtained. It lays a foundation for the research of repairing and remanufacturing of steel tube cold drawing die. According to the design principle of cladding alloy powder and the properties of die material, Two kinds of Ni-base composite alloy powder, M-1M-2, were designed as remanufacturing and repairing spare powder for cold drawing die of worn failure steel tube. At the same time, the control method of cladding effect was studied. The laser cladding and plasma cladding experiments were carried out on the cutting substrate of the two kinds of cladding alloy powder. According to the cladding experience and the characteristics of powder and equipment, the laser and plasma cladding process parameters are determined, and the cladding phenomena in the cladding process are observed. The thermal effects of laser cladding and plasma cladding were compared and analyzed. The microhardness and tensile properties of four kinds of cladding coatings were studied. The comparative test of impact toughness and friction and wear properties and the observation of metallographic structure. Through the analysis and comparison of the experimental results, it is found that the mechanical properties of the cladding layer prepared by laser cladding M-1 composite alloy powder are the best, and the wear resistance is the best. Moreover, the cladding layer has a good metallurgical combination with the base material, which can meet the requirements of remanufacture and repair of steel tube cold drawing die. The remanufacturing and repairing practice of laser cladding M-1 composite alloy powder is carried out on the failed steel tube cold drawing die. The feasibility of repairing steel tube cold drawing die by laser cladding M-1 composite alloy powder was further verified by macroscopic observation and non-destructive inspection.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG355.4

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