Method for preparing wear-resistant coating on surface of ball core of ball valve based on hot-dip plating and rotary extrusion

Abstract

This invention relates to the field of coating preparation, specifically to a method for preparing a wear-resistant coating on the surface of a ball valve core based on hot-dip plating and rotary extrusion. The method includes: cleaning and preheating the ball core substrate; heating a self-fluxing alloy material to a molten state to obtain a plating solution; clamping the ball core substrate with a fixture, immersing the lower half of the ball core substrate in the plating solution; wherein, at a position where the ball core substrate detaches from the plating solution surface, a contouring extrusion roller matching the curvature of the outer spherical surface of the ball core substrate is arranged, maintaining a rigid gap between the contouring extrusion roller and the ball core substrate; the ball core substrate rotates uniformly around its own axis, skimming over the plating solution surface, and the adhering plating solution forms a semi-solid coating before reaching the rigid gap due to the supercooling of the ball core substrate; the semi-solid coating is radially extruded by the contouring extrusion roller during its passage through the rigid gap, and after air cooling, a wear-resistant coating is obtained. This invention overcomes gravity flow, eliminates the secondary sintering process, and achieves coating densification and precise contouring during immersion plating.

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