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Casting problem—Broken ribs

August 20, 2024
Casting information
 
2. Casting photographs
 
Casting photographs
3. Cast analysis
1. The defect position is a deep isolated rib, and the mold cavity is a deep sheet blind hole, which is not conducive to forming and polishing. When the mold is not sufficiently preheated, the molding part of the rib is not good enough to stick inside.
2. Both sides of the runner gate at the end of driving too close to the overflow mouth, the metal flow to reach the overflow mouth formed in gas.
 
4. Improvement
1. Add a flat thimble at the bottom of the isolated rib to assist ejection, and exhaust the thimble gap to improve the molding effect. Because the mold will not stick, the mold continuous operation performance is good, the production rhythm is stable, and the production capacity is also guaranteed.
 

2. Cut off the end gate on both sides as slag bag, adjust the angle of each gate and the center of the circle, fill along the direction of the rib, avoid wrapping gas, improve the forming effect.
Runner adjustment indication
5. Tips
About exhaust gap:
Thimble exhaust gap is too small or too large that the actual exhaust effect will fail, reference gap: unilateral 0.02-0.03mm. The actual gap should be adjusted up and down according to the diameter or thickness of the ejector rod and the ejector rod position.
 
 
 

 

 

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