【摘要】：為了評(píng)價(jià)模具材料的導(dǎo)熱性能對(duì)熱沖壓成形工藝的影響,選擇優(yōu)質(zhì)H13鋼和自主開發(fā)的HDLM熱沖壓專用模具材料進(jìn)行對(duì)比分析,采用LF457型激光導(dǎo)熱儀對(duì)模具材料的導(dǎo)熱性能進(jìn)行評(píng)價(jià),使用光學(xué)顯微鏡、掃描電鏡和透射電鏡對(duì)其組織進(jìn)行觀察。同時(shí),建立了盒形件熱沖壓成形及模內(nèi)淬火過程的數(shù)值仿真模型,研究了模具熱導(dǎo)率對(duì)成形件冷卻行為、組織演變以及模具溫度的影響規(guī)律。研究表明,在熱沖壓模具服役溫度200~400℃內(nèi),HDLM模具鋼的熱導(dǎo)率高于40 W/(m·℃),約為H13鋼的1.5倍;在熱沖壓保壓淬火過程中,模具材料的熱導(dǎo)率對(duì)熱沖壓成形件的冷卻行為起重要作用;當(dāng)模具材料為HDLM鋼時(shí),僅需約10 s就能使盒形件關(guān)鍵部位的組織完全轉(zhuǎn)變?yōu)轳R氏體,相比于H13鋼,其保壓冷卻時(shí)間縮短了近41%,保壓冷卻效率提升了約80%,有效地加快了熱沖壓生產(chǎn)節(jié)拍和提高了生產(chǎn)效率,并且模具溫度的均勻性也有較大改善,最高溫度不超過330℃,有利于延長模具的使用壽命。
[Abstract]:In order to evaluate the influence of thermal conductivity of die materials on hot stamping process, high quality H13 steel and HDLM hot stamping die materials developed by ourselves were selected for comparative analysis. The thermal conductivity of mould materials was evaluated by LF457 laser thermal conductivity instrument, and the microstructure was observed by optical microscope, scanning electron microscope and transmission electron microscope. At the same time, the numerical simulation model of hot stamping forming and quenching process of box parts is established, and the influence of die thermal conductivity on cooling behavior, microstructure evolution and die temperature of forming parts is studied. The results show that the thermal conductivity of HDLM die steel is more than 40 W / (m 鈩，

本文編號(hào)：2270963