New Energy Vehicle Subframe Core Making Solution | Application of Ultra-Low Addition Cold Box Resin
2026-04-13 13:22The rapid development of new energy vehicles has led to the widespread adoption of low-pressure casting (LPS) in subframe production. To ensure casting production efficiency, cold box core making is frequently employed. The performance of the cold box resin directly impacts the sand core performance and casting quality. Xinda has developed an ultra-low addition cold box resin that meets these production requirements.
Factory Situation:
A Xinda customer's automotive parts non-ferrous foundry uses LPS to produce subframes, employing cold box core making. An automated robotic arm is used to grip, transfer, and place the sand cores. Strict requirements are placed on the strength of the cold box sand cores to prevent breakage during handling. Furthermore, excellent collapsibility is crucial for subsequent cleaning.
Casting Production Information:
| Casting Name | Material | Weight | Average Wall Thickness |
|---|---|---|---|
| Subframe | Aluminum Alloy | 21.5 kg | 3~5 mm |
| Sand Mixing Weight per Batch (kg) | Mixing Time (s) | Cold Box Resin Addition (%) | Ratio of Component I & II |
|---|---|---|---|
| 250 | 90±30 | 0.60 | 50/50 |
| Shooting Pressure (bar) | Shooting Time (s) | Curing Pressure (bar) | Curing Time (s) |
|---|---|---|---|
| 4-6 | 1-5 | 0-1 | 5-15 |
| Purge Pressure (bar) | Purge Time (s) | Instant Compressive Strength (MPa) | 24h Compressive Strength (MPa) |
|---|---|---|---|
| 2-6 | 35-45 | 1.1 MPa | 1.15 MPa |
Cold Box Resin Specifications:
| Resin Grade | Density (20°C) (g/cm³) | Viscosity (20°C) (mPa·s) | Free Formaldehyde (%) |
|---|---|---|---|
| XD-11 | 1.05-1.15 | ≤300 | ≤0.3 |
| XD-21 | 1.05-1.20 | ≤100 | / |
Product Performance:
Aluminum alloy subframe sand cores produced using cold box resin offer three advantages
1) Excellent collapsibility: The sand core completely disintegrates during the vibration-induced sand removal stage after casting, significantly reducing the workload of cleaning the sand core.
2) High sand core strength significantly reduces resin addition; the amount of the two-component cold core box can be as low as 0.6%.
3) Less smoke during casting, significantly improving working conditions.
