Precision Grinding Techniques for Mold Inserts and Core Pins

In high-precision injection molding, the dimensional accuracy and surface quality of mold inserts and core pins play a decisive role in part consistency and mold longevity. At Pioneer Plastech (Shenzhen) Ltd., precision grinding is a core manufacturing capability, enabling us to achieve dimensional tolerances as tight as ±0.02 mm for critical tooling components.

Precision That Supports Demanding Applications

Industries such as medical devices, automotive components, and consumer electronics increasingly require tight tolerances, stable alignment, and repeatable molding performance. To meet these demands, Pioneer Plastech applies precision grinding to ensure:

• Consistent dimensional accuracy within ±0.02 mm
• Excellent roundness, straightness, and concentricity
• Smooth surface finishes that reduce wear and friction
• Reliable performance in high-cavity and high-cycle molds

Advanced Grinding Techniques in Tool Manufacturing

Our tooling team selects grinding processes based on part geometry, material properties, and functional requirements:

• Cylindrical Grinding for core pins and round inserts, ensuring stable diameters and concentricity
• Surface Grinding for flat inserts and shut-off areas requiring precise flatness and parallelism
• Centerless Grinding for small-diameter pins with high straightness and production efficiency
• Internal Grinding for sleeves and inserts with tight internal diameter tolerances

These processes are often combined with fine polishing or lapping to meet specific surface finish requirements.

Material Expertise and Process Control

Pioneer Plastech regularly works with hardened tool steels such as H13, S136, SKD61, and other wear-resistant materials. Achieving stable ±0.02 mm accuracy requires:

• Optimized grinding wheel selection and dressing
• Strict thermal control to prevent deformation or micro-cracks
• In-process inspection and final dimensional verificationThis disciplined approach minimizes residual stress and ensures long-term stability of mold components.

Delivering Performance and Tool Life

Precision-ground inserts and core pins contribute directly to:

• Reduced mold maintenance and downtime
• Improved part ejection and reduced flash
• Stable cavity balance in multi-cavity molds
• Extended tool life in high-volume production

At Pioneer Plastech, precision grinding is not a secondary process—it is a foundational capability that supports reliable, high-performance mold manufacturing.