本文選題：冷拔模具　切入點(diǎn)：磨損失效　出處：《燕山大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：鋼管冷拔模具作為鋼管冷拔作業(yè)的核心部件,在管坯劇烈的塑性變形過程中受到復(fù)雜力的作用,同時管坯塑變放熱和摩擦生熱,鋼管冷拔模具的磨損消耗量非常巨大。鋼管冷拔模具作為鋼管冷拔工藝中的易消耗件,對冷拔鋼管的產(chǎn)量、質(zhì)量和成本有著巨大影響,因此要實(shí)現(xiàn)鋼管冷拔行業(yè)的可持續(xù)發(fā)展,如何降低鋼管冷拔模具的磨損消耗,對磨損失效的模具實(shí)行再制造修復(fù),延長鋼管冷拔模具的使用壽命等成為國內(nèi)外各相關(guān)廠家及科研院所面臨的重要課題。本文著重從數(shù)值模擬和實(shí)驗(yàn)的角度展開對鋼管冷拔模具的失效分析和再制造修復(fù)研究,主要內(nèi)容如下:采用DEFORM數(shù)值模擬軟件對鋼管冷拔過程進(jìn)行了模擬分析,求得鋼管冷拔模具在冷拔過程中的溫度場和應(yīng)力場,分析了冷拔過程中拉拔力、模具溫度、模具應(yīng)力、模具磨損量等模擬結(jié)果的變化及分布情況,并得出模具失效的主要原因、形式和失效位置,為鋼管冷拔模具的修復(fù)與再制造研究打下了基礎(chǔ)。根據(jù)熔覆合金粉末的設(shè)計原則和模具材料的性質(zhì),設(shè)計了M-1、M-2兩種鎳基復(fù)合合金粉末作為磨損失效鋼管冷拔模具再制造修復(fù)備用粉末,同時研究了熔覆效果的控制方法。將設(shè)計的兩種熔覆合金粉末在切取的基材試板上分別進(jìn)行了激光熔覆和等離子熔覆實(shí)驗(yàn)研究,根據(jù)熔覆經(jīng)驗(yàn)及粉末與設(shè)備的特性確定了相應(yīng)的激光及等離子熔覆工藝參數(shù)。觀察了熔覆過程中的熔覆現(xiàn)象,并對激光熔覆及等離子熔覆的熱影響進(jìn)行了對比分析。對熔覆實(shí)驗(yàn)制得的四種熔覆層進(jìn)行了顯微硬度、拉伸性能、沖擊韌性和摩擦磨損性能對比實(shí)驗(yàn)及金相組織觀察。通過對實(shí)驗(yàn)結(jié)果的分析對比,發(fā)現(xiàn)激光熔覆M-1復(fù)合合金粉末所制得熔覆層力學(xué)性能、耐磨性能最佳,且熔覆層與基材有著良好的冶金結(jié)合,滿足鋼管冷拔模具的再制造修復(fù)要求。在失效的鋼管冷拔模具上進(jìn)行了激光熔覆M-1復(fù)合合金粉末的再制造修復(fù)實(shí)踐,經(jīng)宏觀觀察及無損探傷未發(fā)現(xiàn)裂紋縮孔等缺陷,進(jìn)一步驗(yàn)證了激光熔覆M-1復(fù)合合金粉末修復(fù)鋼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.
【學(xué)位授予單位】：燕山大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TG355.4

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