Product Name: High-Strength Silicon Nitride ($Si_3N_4$) Insulating Locating Pin / Core
Product Material: Gas Pressure Sintered Silicon Nitride (GPSN), optimized for maximum fracture toughness.
Material Characteristics: Superior toughness (resists chipping and cracking), Extreme thermal shock resistance (survives rapid heating/cooling), High electrical insulation, Non-wetting to molten metal/welding spatter, High hardness (HRA 90+), Low thermal expansion.
Product Configurations: Threaded locating pins, Tapered centering cores, Step-diameter pins, KCF-replacement ceramic pins.
Application Fields: Nut and bolt projection welding, Automotive body-in-white assembly, Precision resistance welding, Induction brazing fixtures, Robotic welding cell grippers, High-speed automated assembly lines.
Application Industries: Advanced Machinery (Automated production lines), New Energy (Electric vehicle battery pack welding), Electronic Engineering (Micro-welding fixtures), Aerospace (High-precision assembly tooling), Broad Semiconductor (Wafer handling alignments).
Processing Difficulties: Achieving micron-level dimensional tolerances on an extremely hard and tough surface, Maintaining high surface finish ($Ra < 0.4 \mu m$) to prevent weld spatter adhesion, Ensuring concentricity for multi-step diameter designs to avoid mechanical interference.
Processing Flow: GPSN powder preparation → Cold Isostatic Pressing (CIP) → Precise green machining → High-temperature gas pressure sintering → Diamond precision grinding (OD and steps) → Surface honing and polishing → 100% Dimensional and crack inspection → Secure industrial packaging.
Delivery Period: Standard specifications: 15-25 days, Customized high-precision or complex geometries: 30-45 days.
Our Silicon Nitride Locating Pins are the premier solution for demanding resistance welding environments. Unlike metal pins that require frequent replacement due to electrical shorting or slag buildup, our $Si_3N_4$ cores are inherently insulating and repel molten metal. The exceptional fracture toughness of silicon nitride allows these pins to withstand the heavy impact of automated nut feeders without shattering. By eliminating the risk of accidental welding between the pin and the workpiece, these ceramic cores significantly increase production uptime and reduce the rate of defective parts in automotive and precision hardware manufacturing.
Key Features:
Slag-Repellent Surface: Molten welding spatter does not adhere to the pin, ensuring consistent part positioning.
Electrical Arc Prevention: High dielectric strength prevents current bypass, ensuring 100% welding energy is directed to the joint.
Unmatched Thermal Stability: Maintains mechanical strength even under continuous high-frequency welding cycles.
Toughness & Durability: Engineered to survive high-impact loading; far more durable than alumina or zirconia in welding apps.
Precision Centering: Tight tolerances ensure perfect alignment for nuts and bolts in automated cells.
