Materials and Properties:
The hard alloy mold is based on a tungsten-cobalt (WC-Co) alloy, with the cobalt content adjusted to a range of 6%-25% depending on the application scenario. The material has a microhardness of HRA89-93, a flexural strength of 3000-4000MPa, and a thermal expansion coefficient of (4.5-6.5)×10^-6/℃, ensuring structural stability at temperatures up to 800℃. Its wear resistance is 20-30 times higher than that of tool steel, making it ideal for high-stress friction applications.
Production Process:
The core manufacturing process includes
Powder Metallurgy Preparation: Tungsten carbide and cobalt powder are mixed and pressed, then sintered under vacuum at 1360-1500℃ to form a dense alloy.
Precision Grinding: A diamond grinding wheel is used for nanometer-level surface processing, achieving a roughness of Ra0.02μm.
Heat Treatment for Strengthening: Low-pressure nitriding is applied to increase the surface hardness to over HV1800.
Structural Optimization: Gradient design technology is employed to ensure that the cobalt content in the mold's surface layer is lower than in the interior, balancing wear resistance and toughness.
Application Fields:
In industrial production, it is primarily used in the following areas
Metal Processing: Drawing and forming of φ0.1-20mm wire, with a precision of ±0.005mm for wire processing.
Automotive Manufacturing: Cold heading of engine valve seat rings, with a single set of molds capable of lasting over 500,000 cycles.
Petroleum Extraction: Production of anti-sulfur valve sealing components, which can operate stably in an environment with a H2S concentration of 15%.
Electronics Industry: Precision stamping of lead frames, with a minimum blanking clearance of 0.003mm
