Securing guide bushings (also known as leader pin bushings or guide pin bushings) into mold plates or die sets is an application where dimensional precision is paramount. These bushings guide the movement of the mold’s core and cavity,ensuring perfect registration. The joint is subjected to massive axial and radial shock forces during mold closure,continuous thermal cycling (from heating/cooling lines), and exposure to mold release agents. Any movement, fretting,or failure of the guide bushing directly compromises part quality, flash control, and mold longevity.
INCURE WeldLock™ 365 Retaining Compound
For securing guide bushings—where maximum shear strength, high-temperature resistance, and absolute zero movement are paramount to maintaining mold alignment—the WeldLock™ 365 provides the highest structural integrity.Its superior strength ensures the bushing is held immovably, preserving the critical alignment between the mold halves.
| Feature & Benefit | Technical Insight for Mold Guide Bushings | Conversion Value |
| Highest Strength (365) | Cures to an extremely high-shear strength, rigid plastic, providing maximum resistance to axial and radial shockforces during mold cycling. | Zero Shift: Eliminates all micro-movement, preserving mold alignment and preventing fretting wear. |
| High Temperature Resistance | Withstands continuous operational temperatures up to 200∘C (392∘F), essential for molds using hot runners or high processing temperatures. | End the Thermal Threat: Guarantees the joint won’t fail or soften under maximum mold operating heat. |
| Fills Close Clearance Gaps | Ideal for components with an interference or true close-tolerance slip fit (less than 0.05 mm diametral clearance) typical of precision mold components. | Maximizes Contact: Converts the fit into a monolithic bond, optimizing load distribution and extending mold life. |
| Chemical Immunity | Inert to mold release agents and typical processing lubricants, ensuring the integrity of the joint is protected. | Reliability Assured: The bond remains permanently intact despite constant chemical exposure. |
Application Steps: Locking Guide Bushings for Maximum Mold Accuracy
Preparation (Critical): Thoroughly clean both the bushing’s outer diameter (OD) and the bore in the mold plate. Remove all oil, grease, and residue. Use a degreasing solvent (like acetone or industrial cleaner) and wipe until both metal surfaces are perfectly dry.
Application: Apply a continuous, liberal bead of WeldLock™ 365 evenly around the bushing’s outer diameter or the inside circumference of the mold bore. Ensure the compound completely covers the mating area.
Assembly: Press the bushing into the bore using the manufacturer’s specified tools. Ensure the component is fully seated.Wipe away any excess compound immediately.
Curing Time (Mandatory): Allow a full 24 hours for the compound to reach full cure strength before assembling the mold or subjecting it to operational pressure and thermal cycling.
Alternative Consideration (Worn Bores or Maintenance): If the mold plate bore is slightly worn and the clearance gap is larger (up to 0.25 mm), use INCURE WeldLock™ 356 (Metallic Grey). This compound is specifically formulated with fillers to tolerate larger diametrical clearances while still providing high structural integrity.
Stop risking mold misalignment and ensure your guide bushings provide absolute, consistent precision.