RP Coated Ejector Punches with Locating Dowel Holes

RP coated ejector punches with locating dowel holes are used in injection mold tooling and stamping-style punch-and-die operations where repeatable center positioning is critical. The locating dowel hole feature provides stable center guidance during high-cycle ejection/punching, helping reduce misalignment-related wear in the punch tip and shank.

• Automotive connector and bracket molds: Suitable for difficult punching cycles where consistent punch trajectory and reduced maintenance are needed; the coating/adhesion system helps maintain wear performance under intermittent load.
• Appliance and electrical component housings: Works well for punching operations that require reliable tip geometry retention and improved resistance to abrasive wear; choose the appropriate tip shape and dimensions to match the die opening and land geometry.
• Medical device housings with tight positional requirements: The locating dowel holes support repeatable punch placement, which helps maintain dimensional stability across production lots.

Use the RP-coated variant when longer punch life is required for challenging punching conditions due to the combination of Al-Cr coating and alpha treatment for durable wear and coating adhesion.

This product is an RP-coated ejector punch variant optimized for wear performance. The Al-Cr RP coating provides a hard, heat-resistant surface layer intended to resist abrasive and adhesive wear during repeated punching/ejection cycles.

• Alpha treatment: Improves coating film adhesion to the substrate, supporting coating stability under cyclic loading and helping reduce coating-related failure modes.
• Hardness and wear vs. toughness: The coated system increases surface hardness and wear resistance, while toughness is primarily governed by the underlying punch steel; select the correct ejector type (standard vs. spring reinforced) to balance rigidity and deflection resistance.
• Heat treatment state: The provided specifications emphasize the coating and alpha treatment; specific substrate hardness (HRC) and tempering parameters are not listed in the input data.

Select the punch dimensions by matching the tip geometry to the die opening and the required ejection/punching function, then verify overall length for safe tool engagement.

• Shank diameter (D): Choose from 10–45 mm based on the guide/bushing requirements and available clearance in the retainer.
• Tip dimension and corner geometry: Use P 3–35 mm, W 3–9 mm, and tip corner R = 0.15 mm to align with the die land/contact area.
• Length control: Confirm L within the allowed sets (70–120, 60–120, 80–120, or 100–120 mm) and the full length alteration LC = 34–72 mm.
• Tip modification ranges: If using altered tip dimensions, keep PC 2.8–30 mm and WC 2.8–8 mm within spec to preserve fit with the corresponding die geometry.

For locating dowel compatibility, ensure the punch’s locating dowel hole pattern matches the mold’s dowel layout; dimensional tolerances for press fit/clearance are not provided here, so confirm with your assembly drawings.