| 换挡拨头表面异常分析 |
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| 引用本文： | 杜冈峰,曹淑芬,曹晨,杨玉. 换挡拨头表面异常分析[J]. 拖拉机, 2013, 0(6): 70-71 |
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| 作者姓名： | 杜冈峰 曹淑芬 曹晨 杨玉 |
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| 作者单位： | 中国一拖集团有限公司工艺材料研究所,河南洛阳471004 |
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| 摘 要： | 采用熔模铸造,铸造了一批换挡拔头,经正火、氧化酸洗处理后发现部分换挡披头表面出现麻坑现象。采用宏观观察,显微观察,耐腐蚀试验,化学成分分析,并结合铸造工艺进行了综合分析,结果表明,换挡拔头在浇注时,熔模壳内壁存在硅酸盐夹杂瘤附着在零件的表面,酸洗氧化过程中零件表层的硅酸盐夹杂脱落造成表面麻坑现象。
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| 关 键 词： | 换挡拨头 熔模铸造 硅酸盐夹杂瘤 表面麻坑 |
Analysis of Abnormal Surface of Shifting Head |
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| DU Cng-feng,CAO Shu-fen,CAO Chert,YANG Yu. Analysis of Abnormal Surface of Shifting Head[J]. , 2013, 0(6): 70-71 |
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| Authors: | DU Cng-feng CAO Shu-fen CAO Chert YANG Yu |
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| Affiliation: | (Technnlogy and Materials Research Institute, YTO Group Corporation ,Luoyang 471004 ,China) |
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| Abstract: | A batch of shifting heads were easted by using investment casting in a facory, the pockmarks were observed on the surface of some shifting heads after normalizing and oxidation of acid pickling. Combined with the foundry technology,the comprehensive analysis was proceeded by means of macroscopic observation, microexamination, corrosion resistance test, and chemical composition analysis. The results showed that the silicate mixed tumor which existed in investment casting shell attached to the surface of parts when the shifting heads were casting,the silicate on the surface of parts tailed off in the process of oxidation of acid pickling,and then the surface pockmark was formed. |
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| Keywords: | Shifting head Investment casting Silicate mixed tumor Surface pockmark |
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