DFM is a key step in developing a reliable high-pressure die casting mold. It helps identify filling problems, porosity risks, and production issues before mold manufacturing begins.
In this oil pan die casting mold project, Raidy Mold compared two gating system designs using mold flow analysis and engineering experience. The goal was to achieve stable metal flow, reduce air entrapment and porosity, and control mold cost.
After reviewing the customer’s machine, production process, and operating conditions, we selected Solution 1: single-side gating with the filter at the water end.
This solution provides more stable filling, lower defect risk, better machine compatibility, and lower mold cost. It also demonstrates why the best gating system should be designed around the actual part structure and production conditions, rather than using a standard solution for every project.
What Are the Key DFM Challenges in Oil Pan Die Casting Mold Design?
Oil pans are critical automotive components that require high structural integrity, excellent sealing performance, and minimal internal defects. In die casting, the gating system design directly impacts metal flow behavior, porosity formation, shrinkage defects, and overall product quality.
During the DFM review phase, two feeding system solutions were proposed:
- Option 1: Single-side gating Filter located at the water end.
- Option 2: Double-side gating Filter located on the side.
Each design presents different characteristics in terms of flow path, filling balance, and venting efficiency, requiring detailed evaluation through simulation and engineering analysis.
How Does Mold Flow Analysis Compare the Two Gating Solutions?
Raidy’s engineering team conducted comprehensive mold flow simulations to evaluate filling behavior, temperature distribution, and air entrapment risks for both options.
Which Gating Design Provides More Stable Metal Flow?
Simulation results show clear differences:
- Option 2 (Double-side gating)
- Molten aluminum flows from both sides and meets in the middle
- Strong flow collision occurs in the central region
- Higher turbulence increases air entrapment risk
- Critical areas such as the top ring and horn-shaped section show significant gas entrapment risk
- Option 1 (Single-side gating)
- Metal flows in a single, continuous direction
- More stable and controlled filling process
- Reduced turbulence and fewer flow intersections
- Improved overall flow consistency
Conclusion: Option 1 provides superior flow stability and reduced defect risk.
Which Gating Design Provides More Stable Metal Flow?
Simulation data indicates:
- Option 1: Approximately 600°C
- Option 2: Approximately 630°C
Higher temperatures can improve fluidity but also increase oxidation, mold thermal stress, and burn defects.
Therefore, Option 1 offers better thermal control and lower burn risk, contributing to improved mold life and product quality.
Which Gating Design Provides More Stable Metal Flow?
In die casting, air entrapment and shrinkage porosity are major quality concerns. Raidy’s team performed detailed defect analysis for both designs.
Risks in Option 2
- Air entrapment in the top ring area
- Gas accumulation in horn-shaped regions
- Increased porosity due to metal flow collision
- Reduced internal density consistency
Optimization Strategies for Option 1
Although Option 1 performs better overall, targeted improvements are still necessary:
- Strengthen overflow (slag collector) design to remove cold metal
- Enhance venting system, including vacuum-assisted evacuation
- Use 3D-printed inserts in critical areas (e.g., horn section) to optimize flow behavior
- Refine local gating structure to minimize turbulence
These improvements can significantly reduce defect rates and improve product consistency.
Gating and Overflow System Design Experience
Raidy Mold has extensive experience designing similar oil pan and structural component molds. Based on proven projects, the recommended configuration includes:
- Single-side nozzle gating system
- Filter positioned at the water end
- Integration with machine-side thermal control components
Historical production data shows:
- Scrap rate around 14% under standard conditions
- Further reduction achievable through process optimization
- High stability and repeatability in mass production
This solution is validated by real production data, not just theoretical simulation.
How Does Gating Design Affect Die Casting Mold Cost and Machine Compatibility?
In addition to quality, Raidy evaluates cost efficiency and equipment flexibility.
Mold Cost Comparison
- Option 1: Compact structure, smaller mold size
- Estimated cost savings: ~200,000 RMB (~$28,000 USD) compared to Option 2
Die Casting Machine Compatibility
- Option 1: Suitable for 1250T and 1650T machines
- Option 2: Only suitable for 1650T machines due to larger mold size
Option 1 offers greater flexibility and reduces capital investment for customers.
Quality and Production Risk Evaluation
Disadvantages of Option 2:
- Flow collision increases air entrapment
- Higher porosity risk
- Larger mold size and higher cost
- Limited machine compatibility
Advantages of Option 1:
- More stable metal flow
- Lower defect risk
- Reduced mold cost
- Wider machine compatibility
- Further optimization potential
Why Raidy Mold Recommends Single-Side Gating for This Oil Pan Mold
Based on simulation results, engineering analysis, and cost evaluation, Raidy Mold’s technical team recommends:
Option 1: Single-side gating with filter at the water end, combined with 3D-printed inserts for local optimization
This solution provides:
- Improved flow stability
- Lower porosity and defect risk
- Better cost efficiency
- Enhanced production flexibility
- Proven feasibility for mass production
FAQ
Q1. What is DFM in the context of die casting mold design?
DFM (Design for Manufacturability) is a process used to optimize die casting mold designs in order to improve production efficiency, reduce costs, and minimize defects.
Q2. What problems can result from a poorly designed gating system?
A poorly designed gating system can lead to issues in die-cast parts such as porosity, shrinkage, cold shuts, air entrapment, and incomplete filling.
Q3. What role does venting play in die casting?
Venting removes air and gases from the mold cavity, thereby increasing casting density and reducing porosity defects.
Q4. How do 3D-printed inserts benefit die casting molds?
They enable the creation of complex geometries, improve localized flow control, and enhance cooling efficiency in critical areas.
Q5. Which industries utilize die casting molds?
Die casting molds are widely used in the automotive, electronics, industrial equipment, and consumer goods industries.
Q6. What is the typical lifespan of a die casting mold?
High-quality die casting molds can have a lifespan ranging from 50,000 to over 200,000 shots, depending on the materials used and the maintenance regimen.
Q7. What factors influence the cost of a die casting mold?
The cost is determined by the mold’s size, structural complexity, materials, production volume, and the required precision.
Raidy Mold Technical Strengths
This oil pan mold DFM case highlights Raidy’s core strengths:
- Advanced mold flow simulation capability
- Strong engineering experience in die casting molds
- Systematic DFM review process
- Ability to balance quality, cost, and manufacturability
- Integration of advanced technologies like 3D printing
By applying a structured DFM approach, Raidy Mold Manufacturer helps customers:
- Reduce trial iterations
- Shorten development cycles
- Improve first-shot success rates
- Achieve stable mass production
Raidy Mold Factory manufactures over 100 different types of HPDC molds for oil pans. We can resolve any issue. Contact us for a superior solution.
