重载铁路货车6483减震旁承的生产工艺

Side Bearer Production Process of 6483 Shock Absorber Used for Heavy Duty Railway Wagon

介绍了重载铁路货车6483减震旁承的铸件结构及技术要求,详细阐述了生产工艺:采用发气量小的覆膜砂,每个铸型做6个铸件,采用无冒口铸造工艺,半封闭式浇注系统,浇道比为∑F_内:∑F_横:∑F_直=1:1.6:1.2;采用优质原材料,严格控制w(Mg_残)和w(Si_终)量;热处理工艺为:铸件升温至900℃,保温70 min后,转至250~280℃盐池中淬火,保持70 min。生产结果显示:铸件基体组织为下贝氏体及10%以下的残余奥氏体,抗拉强度≥1 200 MPa,伸长率为2%~4%,布氏硬度达到352~434 HB,符合技术要求。

Bearer casting constructure and technical requirements of 6483 sock absorber used for heavy duty railway wagon were introduced. Its production process was described in detail as following：Using low gas evolution resin-coated sand;6 castings produced per mold ; Using riser-less casting method, semi-pressurized gating system,gating ratio was of ∑Frunner：∑Fsprue=1： 1.6：1.2; Using high-quality raw materials, strictly controlling contents of Mgresidual, Si end;Its heat treatment process was： Casting temperature rising to 900 ℃, holding for 70 rain, isothermally quenching in salt hath with temperature of 250-280 ℃,holdig for 70 min. The production result showed：Matrix structure of the casting was of lower bainite ＋ residual austenite less than 10%,tensile strength was of 1 200 MPa,elongation was of 2%-4% ,Brinell hardness reached 352~434 HB, meeting technical requirements.