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Castings info--Transmission housing

August 29, 2024
1. Castings info:
Casting name: Transmission housing
Requirement:  internal 
Die Casting process:
Die casting machine tonnage:2500T
punch dia (mm):120
material: ADC12
casting weight (g):7813
filling weight(g):9685
casting size(mm):453*334*206
average wall thickness(mm):4
high speed m/s:3.3
 dry injection stroke(mm):1119
high speed switching position(mm):780
flow gate section mm²:848
2. Die castings question:
    machining hole,see the defective
    position picture
3.Casting picture
Casting pictureCasting pictureCasting picture
4. casting analyse
Mould temperature analyse:average mould temperature 230℃,mould temperature is normal 
casting analyse
The design question of the extrusion hole:
1.PIN hole’s bad design,machining allowance 1.375mm,hole appear after machining
casting analyse
5. improvement
Extrude PIN,forced feeding not enough, change PIN into two pieces,reduce machining allowance,
avoid bubbles be caused
extruding pin adjust indication
6.results of improvement
Before improve,return outlet average defective rate 4.83%
After improvement,this rate is below 0.5%
defects improved cross section view
7.Tips:
For partial extrusion
The inner quality of partial extrusion always becomes worse as the distance between the internal position and the core surface increases
 
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