The Concrete Screw is a specialized high-performance fastener engineered for direct anchoring into concrete, brick, and other masonry materials without the need for plugs or shields. Its distinctive design typically incorporates deep, aggressive, widely-spaced threads with high flank angles, a sharp, self-tapping tip often notched for dust removal, and a high-strength hardened steel construction. Producing the blank for such a demanding application presents a formidable metal-forming challenge: it requires a shank with substantial volume to accommodate the deep threads and the ability to handle high-strength steel wire. Our JYX15 series Two-Blow Screw Cold Heading Machines, particularly the larger models like the JYX15-76G and JYX15-100G, are robustly engineered to forge these critical blanks, forming the high-integrity foundation required for reliable concrete anchors.
The two-strike, single-die process of our concrete screw cold header is fundamental to creating a blank with the necessary shank geometry and structural density. The first blow powerfully gathers and compacts the often high-carbon steel wire, establishing a robust pre-form with significant material volume for the subsequent thread rolling. The decisive second blow then finalizes the head shape (often a Phillips or hex washer head) and critically, upsets the shank to its precise final diameter and volume. This controlled two-stage deformation under high pressure is crucial for achieving a dense, work-hardened shank structure, which is a prerequisite for the screw's final high tensile and shear strength after heat treatment and threading.
This capability is underpinned by the machine's unparalleled stability and power. The widened, thickened, and entirety quenched vertical sliding plate guarantees vibration-free sliding, which is vital for maintaining die alignment and preventing defects when forming high-strength materials. The special high-strength, anti-wear alloy steel crankshaft provides the consistent, high-tonnage force needed to achieve plastic deformation in tough steels and ensure the die cavity is completely filled. This results in a flawless, dense blank with optimal shank volume, perfectly prepared for the subsequent processes of thread rolling and heat treatment that will transform it into a high-strength concrete anchor.
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