冲裁温度对BR1500HS硼钢精密齿轮热冲裁件微观组织及冲裁精度的影响  

Effect of blanking temperature on microstructure and punching precision of hot blanked parts of BR1500HS boron steel precision gear

作　　者：孙颖 贺连芳[1] 高羽丰 孙然 李志超 李辉平[1] SUN Ying;HE Lian-fang;GAO Yu-feng;SUN Ran;LI Zhi-chao;LI Hui-ping(School of Materials Science and Engineering,Shandong University of Science and Technology,Qingdao 266590,China)

机构地区：[1]山东科技大学材料科学与工程学院,山东青岛266590

出　　处：《材料热处理学报》2023年第9期122-129,共8页Transactions of Materials and Heat Treatment

基　　金：山东省自然科学基金(ZR2021ME129)。

摘　　要：采用光学显微镜、扫描电镜和显微硬度计等研究不同冲裁温度(600~800℃)对BR1500HS硼钢齿轮形落料件的微观组织、光亮带宽度、尺寸精度和最大冲裁力的影响。结果表明:冲裁温度为600℃时落料件的室温组织为铁素体、珠光体和贝氏体的混合组织;冲裁温度为650℃时室温组织为铁素体、贝氏体和少量马氏体的混合组织;冲裁温度为700~800℃时室温组织为完全马氏体组织,硬度较高,稳定在550 HV0.1左右。综合考虑落料件的尺寸精度、断面质量、最大冲裁力以及微观组织,齿轮形落料件的最优热冲裁温度为800℃,此时落料件的显微组织为完全马氏体组织,耐磨性较好,强度与硬度较高,落料件光亮带宽度最大,断面质量最好,最大冲裁力最小,可满足精密齿轮零件的技术要求。Effect of different blanking temperatures(600-800℃)on microstructure,burnish zone width,dimensional accuracy and maximum punching force of BR1500HS boron steel gear-shaped blanking parts were studied by means of optical microscope,scanning electron microscopy and microhardness tester.The results show that when the blanking temperature is 600℃,the room temperature microstructure of the blanking parts is a mixture of ferrite,pearlite and bainite.When the blanking temperature is 650℃,the room temperature microstructure is a mixture of ferrite,bainite and a small amount of martensite.When the blanking temperature is 700-800℃,the room temperature microstructure is complete martensite,and the hardness is relatively high and stable at about 550 HV0.1.Taking into account the dimensional accuracy,cross-sectional quality,maximum punching force and microstructure of the blanking parts,the optimal hot blanking temperature for gear-shaped blanking parts is 800℃.At this time,the microstructure of the blanking parts is complete martensite,with good wear resistance,high strength and hardness.The width of the burnish zone of the blanking parts is the largest,the cross-sectional quality is the best,and the maximum punching force is the smallest,which can meet the technical requirements of the precision gear parts.

关 键 词：BR1500HS硼钢 冲裁温度 微观组织 冲裁精度 

分 类 号：TG142.3[一般工业技术—材料科学与工程]