双金属复合锤头生产工艺及性能的研究精选.doc

郑州大学毕业设计（论文） 题 目：双金属复合锤头生产工艺及性能的研究 Research on Production Technology and Performance of Bimetal Hammers 指导教师： 职称： 教授 学生姓名： 学号： 专 业： 材料成型及控制工程 院（系）： 材料科学与工程学院 完成时间： 2008年5月30日 2008年 6月 2日摘 要 本文采用镶铸工艺铸造双金属复合锤头。锤端材料为含铬量18%的高铬铸铁，锤柄材料为型号ZG35的中碳钢。造型时锤端和浇注系统内浇道的成型分别采用木模和消失模模型。先铸造出锤柄材料，再在欲复合端浇注高铸铁液。复合时将砂型整体放频率为1400HZ的入感应线圈中感应加热，加热过程中消失模受热汽化。当锤柄升到预定温度(800℃左右)时，开始浇注复合层金属液。所得的界面为完全冶金结合。浇注温度为1500℃。复合部分经热处理后组织为Cr7C3共晶碳化物+马氏体+少量残奥，基体为珠光体+铁素体。HRC≥58，k≥6 J／cm25倍左右。 关键词：双金属；锤头；型内感应加热；消失模。 Abstract The inlay casting was used to cast the bi-metal hammer in this paper. The hammer head of bi-metal hammer is made up of high-chromium cast iron and base matrix material of hammer handle is ZG35. The combining technology is carried out by in-mold induction heating with a frequency of 1400HZ. The hammer handle with foam pattern of hammer head is placed in the sand mold when molding. The hammer handle was fist casted and then was the hammer head. The sand mold with the hammer handles and foam pattern of hammer head is wholly placed in the induction-heat ring. The hammer handle is preheated by the intermediate frequency induction heating. While its temperature is raising the foam pattern is gradually vaporized. The pour is begun when the temperature(about 800℃) is reached . The composite interface of bi-metal is wholly metallurgical bonding. The composite bed is Cr7C3 eutectic carbide + marten site + little residual austenite. HRC≥58, ak≥6 J／cm2 .Matrix is pearlier + ferrite. The service life of this kind of hammer is about 5 times over austenitic manganese steel.Key words: Bi-metal; Hammer; In-mold induction heating; Lost form casting. 目录 摘 要 i Abstract ii 1　概 述 1 1.1　研究的目的和意义 1 1.2　常用双金属复合工艺现状及发展 1 1.3　研究目标和研究内容 3 2　实验方法 4 2.1　工况分析 4 2.2　成分设计 5 2.3　加工工艺与过程 7 2.2.1　复合工艺方案的制定 7 2.2.2　复合铸造工艺 8 2.2.3　热处理工艺 9 2.4　高铬铸铁的组织观测和性能测试 10 2.4.1　硬度的测试 10 2.4.2　冲击韧性的测定 11 2.4.3　金相组织观察 11 2.5　双金属结合界面的测试 11 3　实验结果与讨论 12 3.1　高