Research on Sticking Issues in Bracket Die Casting – A Process Optimization Case Based on Intermittent Cooling Control
In the Aluminum High Pressure Die Casting industry, structural components such as brackets often present persistent sticking (soldering) issues due to their complex core-pulling and encapsulated design. These problems not only reduce production efficiency but also increase scrap rates and accelerate mold wear. As a professional die casting mold manufacturer, RaidyMold has conducted in-depth research and implemented innovative process solutions to significantly reduce sticking issues in such products.
1. Background and Current Challenges
Bracket-type components typically face the following challenges:
- Structural constraints: Large core-pulling combined with tight encapsulation leads to strong adhesion between the casting and mold;
- Thermal imbalance: Localized overheating, especially around core areas, increases aluminum adhesion;
- High demolding resistance: Tight core packing creates excessive friction during ejection;
- Limited effectiveness of traditional methods: Measures such as reducing dwell time or increasing release agents only provide partial relief.
Although previous process optimizations have reduced sticking frequency to some extent, the issue remains unresolved at a fundamental level.
2. Root Cause Analysis
RaidyMold conducted a systematic analysis based on four key factors:
Die Casting Mold Cooling Channel Design
Uneven cooling channel distribution results in localized heat accumulation, particularly in large core areas.
Mold Surface Temperature
Excessively high mold temperatures significantly increase the adhesion tendency of molten aluminum.
Core Pulling Tightness
Encapsulated structures create large contact areas, increasing friction and demolding difficulty.
Product Surface Quality Requirements
Higher surface quality standards often correlate with increased sticking risks under high temperature and pressure.
The analysis concluded that unstable and excessive local temperature is one of the primary causes of sticking.
3. Solution: Intermittent Cooling Water Control
To address the issue, RaidyMold developed an intermittent cooling control strategy, focusing on dynamic thermal management.
Key Process Parameters:
- Die casting mold type: Bracket with large core-pulling encapsulation structure
- Cooling control: Single-loop independent control (replacing manual operation)
- Control area: Moving half – large core region
- Cycle time: 52 seconds
- Injection signal delay: 2 seconds
- Cooling water duration: 18 seconds
- Special setting: No water flow during spraying phase
Process Principle
Instead of continuous cooling, intermittent cooling achieves:
- Controlled and stable mold temperature;
- Prevention of local overheating or overcooling;
- Reduced aluminum adhesion tendency;
- Improved thermal stress distribution.
4. Experimental Results and Performance
After implementation and mass production validation, the following results were achieved:
Significant Reduction in Sticking
- Sticking frequency greatly decreased;
- Less downtime for die casting mold cleaning and maintenance.
Improved Production Efficiency
- Cycle time reduced from 71 seconds to 52 seconds;
- Overall efficiency increased by approximately 26%.
Enhanced Product Quality
- Scrap rate reduced by about 50%;
- Surface consistency significantly improved.
Extended Mold Life (Potential)
- Reduced thermal fatigue;
- Less mold damage caused by sticking.
5. Key Takeaways for the Industry
This case highlights several important insights:
- Temperature control is the core variable in solving sticking issues;
- Automated control systems outperform manual adjustments;
- Integrated optimization of structure and process is essential;
- Data-driven experimentation is critical for success.
For similar structural parts such as brackets and housings, dynamic cooling strategies should be prioritized.
6. About RaidyMold
RaidyMold is a specialized manufacturer focused on high-performance aluminum die casting molds and process optimization solutions.
Our expertise includes:
- Complex die casting mold design and manufacturing
- Mold thermal balance and cooling optimization
- Troubleshooting of sticking, porosity, and deformation issues
- Automation and intelligent process upgrades
We deliver not just molds, but complete, results-driven engineering solutions to help you achieve:
- Higher yield rates
- Faster cycle times
- Lower overall production costs
7. Call to Action
In today’s competitive die casting market, efficiency and quality define success. Persistent issues like sticking are not just technical challenges—they are opportunities for improvement and differentiation.
If you are facing:
- Frequent sticking problems
- Slow cycle times
- High scrap rates
We invite you to connect with RaidyMold for a tailored solution.
Contact RaidyMold today and transform your die casting performance.
