Utility Model Patent

“Dual-Layer Mold for Resin-Bonded Grinding Wheels”

This patent protects a novel structural design of a press molding die specifically engineered for the hot-pressing production of high-performance resin-bonded abrasive wheels used in railway and industrial applications.

Unlike conventional single-cavity molds, this patented dual-layer mold assembly integrates two functionally coordinated zones within a single tooling system to achieve superior compaction uniformity, density control, and dimensional accuracy during the wheel forming process.

Technical Innovation

The core innovation lies in the mold’s two-tier pressure distribution mechanism:

The outer layer cavity is optimized for shaping the working face of the grinding wheel, ensuring precise profile conformity (e.g., for rail head contouring);

The inner support layer cavity features a reinforced base structure with controlled venting channels that facilitate even resin flow and gas escape during curing.

This dual-layer configuration enables gradient compaction: higher pressure is applied to the abrasive-rich outer zone for maximum cutting efficiency, while the inner core receives balanced pressure to maintain structural integrity—without causing internal stress cracks or delamination.

Additionally, the mold incorporates:

Precision alignment pins and thermal expansion compensation gaps;

Quick-release mechanisms for efficient demolding;

Surface-hardened steel components for extended service life under repeated high-temperature cycles (typically 150–200°C).