摘要
介绍了3502131-A0E圆柱齿轮外壳油道产生的粘砂、烧结、气孔以及断芯等缺陷,通过对上述缺陷进行逐一分析,最终通过改用50/100目、AFS为51的宝珠覆膜砂生产油道芯,将制芯温度调整到280±20℃,制芯时间调整到55-60 s,改用封闭式浇注系统,并在型板上增加排气系统解决油道内腔的粘砂、烧结及气孔问题;通过将砂芯上芯头的斜度更改为斜5°,油道芯与砂型的配合间隙增加0.6 mm,解决了油道芯断裂缺陷,既不会过多的增加成本,又解决了油道内腔缺陷,提高了铸件质量。
The defects of sand fusion,agglomeration,gas hole and core broke were introduced. By analyses the defects one by one,a kind of precoated sand with 50/100 mesh and 51 AFS fineness was used to produce oil channel core. The temperature used to make core was set to 280±20 ℃ and hold for 55-60 s. Choked gating system was used and vent system was added on pattern to reduce sand fusion,agglomeration and gas hole. By tilting the sand core to 5° and increasing the fit clearance between core and sand mold by 0.6 mm,oil channel core fracture defect was eliminated. These methods increase very little costs and reduce the oil channel lumen defects. The quality of castings was improved.
出处
《现代铸铁》
CAS
2016年第4期74-76,共3页
Modern Cast Iron
关键词
齿轮外壳
覆膜砂
制芯工艺
排气
配合间隙
gear case
precoated sand
core making process
vent
fit clearance
