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Casting problem

August 28, 2024
1.  Casting problem
Surface drawing has flow marks
Casting information
Casting information
2. Casting photographs
3. Cast analysis 
The casting in this case is a high quality appearance products, which requires the expansion force of the mold to be 20-30% higher than that of ordinary appearance ones, and taking 60-80Mpa commonly (experiential data).
1. It was due to a lack of clamping force,  as the improving orientation is wrong, which widening the flow path increasing the projected area and the surface flow marks defects 
2.  The casting has many perforations, which has improving space although it has bridged the metal flow and made a role.
3.  Gate buffering characteristics affect filling speed, and it’s not suitable for high quality appearance parts (which are usually used in gravity casting and ultra low speed Die Casting). 
Currently filling flow explanation
4. Improvement 
1. The projected area of the casting system is larger than the projected area of the product,  product shape 262x150 projection area is 393, according to 60Mpa calculation needs to use 500T die casting machine.
2. All the perforations are made of 0.6mm thick fully enclosed bridge through the metal, and then the bridge is cut by punching dies.
3. Cancel the gate buffering characteristics to increase filling speed.
5. Tips
About bridge:
Bridge should avoid the excessive difference of wall thickness and section, as a result, the bridge metal liquid and other metal liquid filling is not synchronized, resulting in roundabout wrapping.
 
Contact Us

Author:

Mr. Logan

Phone/WhatsApp:

8618157495020

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