汽车发动机铝合金下缸体的压铸模设计
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摘要
针对某汽车发动机铝合金下缸体的结构特点,在其压铸模开发中采用鹰嘴式进料,分4区排气的浇注系统,解决了零件成形困难、卷气严重、内部气孔等问题。设计了5个铸铁镶嵌件的安装方式和230℃的预热温度,解决镶嵌件安装定位和分离问题。入料对正的长型芯,采用YXR33/W360高韧性材料,Dura-AR表面电浆处理并增加高压超点冷,解决了型芯容易冲断和烧伤问题。在高压油道孔部位设计挤压销,挤压油缸设计冷却板,解决了缩孔问题并保证了连续生产。
A gating system of eagle beak feeder and 4-subzone venting has been adopted for die-casting die design based on the structural features of the aluminum alloy lower cylinder of a new type of automobile engine,solving problems such as difficult parts forming,prominent air entrapment and poor quality of internal porosity.The installation mode of 5 cast iron inserts and the preheating temperature of 230℃ were designed to solve the positioning and separation problems of inserts installation.Some measures,including the long mold core for in-material alignment made from YXR33/W360 high-tenacity material,Dura-AR surface plasma treatment and increased high-pressure spot supercooling,were adopted to avoid the thrust and burn of the mold core.Extrusion pin was designed at high-pressure oil passage hole and the extrusion cylinder was designed with cooling plate to solve the problem of shrinkage cavity and ensure continuous production.
A gating system of eagle beak feeder and 4-subzone venting has been adopted for die-casting die design based on the structural features of the aluminum alloy lower cylinder of a new type of automobile engine,solving problems such as difficult parts forming,prominent air entrapment and poor quality of internal porosity.The installation mode of 5 cast iron inserts and the preheating temperature of 230℃ were designed to solve the positioning and separation problems of inserts installation.Some measures,including the long mold core for in-material alignment made from YXR33/W360 high-tenacity material,Dura-AR surface plasma treatment and increased high-pressure spot supercooling,were adopted to avoid the thrust and burn of the mold core.Extrusion pin was designed at high-pressure oil passage hole and the extrusion cylinder was designed with cooling plate to solve the problem of shrinkage cavity and ensure continuous production.
引文
[1]黄志垣,万里,孙永明,等.汽车发动机下缸体的压铸技术及品质控制[J].特种铸造及有色合金,2012,32(4):350-352.
[2]安玉山,常移迁.直喷发动机油底壳浇注系统改进设计与模具优化[J].特种铸造及有色合金,2017,37(3):288-290.
[3]吴春苗.压铸技术手册[M].广州:广东科技出版社,2007.
[4]潘宪曾.压铸模具设计手册[M].北京:机械工业出版社,2006.
[5]贾志欣,毛杰杰,李继强,等.局部挤压辅助提高压铸件质量的研究和应用[J].特种铸造及有色合金,2018,38(7):728-730.
[6]张百在,万里,董军刚,等.一种压铸模型芯的冷却控制方法及装置:中国专利,2010101202430[P].2010-10-12.
[2]安玉山,常移迁.直喷发动机油底壳浇注系统改进设计与模具优化[J].特种铸造及有色合金,2017,37(3):288-290.
[3]吴春苗.压铸技术手册[M].广州:广东科技出版社,2007.
[4]潘宪曾.压铸模具设计手册[M].北京:机械工业出版社,2006.
[5]贾志欣,毛杰杰,李继强,等.局部挤压辅助提高压铸件质量的研究和应用[J].特种铸造及有色合金,2018,38(7):728-730.
[6]张百在,万里,董军刚,等.一种压铸模型芯的冷却控制方法及装置:中国专利,2010101202430[P].2010-10-12.