RP Coated Punches with Key Grooves

RP coated punches with key grooves are used in precision progressive and transfer injection mold tooling where the punch tip must survive repeated high-contact cycles. The Al-Cr based RP coating combined with Alpha treatment is well-suited for automotive connector and bracket molds, where intermittent misalignment and adhesive wear can shorten punch life.

• Automotive connector molds: Use for small-to-medium shank diameters 3–16 mm to maintain tip hardness and adhesion under frequent ejection and piercing loads.
• Consumer electronics housings: Key-groove punches help locate properly during modular die build-offs; the coating adhesion improvement supports longer running with less maintenance.
• Medical device component molds: When long production runs demand stable surface quality, the enhanced coating durability helps reduce rework and downtime caused by coating degradation.

This variant’s coating adhesion and wear resistance focus makes it a strong choice for operations where punch maintenance intervals directly impact cycle productivity.

The punches are made from powdered high-speed steel with an SKH51 equivalent material selection. SKH51 is commonly associated with AISI M2 class performance, providing a balance of wear resistance and toughness for cutting/punching service.

• Coating system: An Al-Cr based RP coating is applied for high hardness and heat resistance at the punch interface.
• Adhesion enhancement: Alpha treatment strengthens film adhesion to the steel substrate, reducing coating delamination under repeated impacts.
• Heat treatment state: The provided specifications emphasize coating + Alpha treatment for durability; no specific bulk heat-treatment target (e.g., HRC or quench/temper) is listed, so selection should be confirmed during procurement.

In wear-dominant punching, the harder surface typically reduces abrasion; however, achieving high adhesion and film integrity is critical to preserve toughness and prevent premature coating failure.

Select the punch based on the steel geometry that matches your mold insert design and location features. Start with the shank diameter D in the range 3–16 mm and confirm the provided tolerance +0.005/0, m5 for fit in the guide/bushing interface.

• Tip geometry: Choose tip shape A, D, E, G, R and match the tip dimension parameters: P = 1–10 mm, W = 1–5 mm, and corner radius R = 0.15 mm.
• Length match: Select B (tip length) among L, S, X, and choose L (L dimension) from the provided options (e.g., 50–80, 60–100, 40–100 depending on the variant). Verify LC (full length alteration) and LCT range limits to hit total stack height targets.
• Key groove location: Confirm key groove position T = 5.1–80 or 5.1–100 mm so the punch clocks correctly to the complementary groove geometry.

Where dimension “alteration” parameters apply (PC, WC, LC, LCT), treat them as configurable adjustments—use them to correct for cavity/core height while maintaining the critical fit diameter tolerances.