The production of a high-performance self-drilling screw begins with a superior blank, and our Two-Blow Screw Cold Heading Machine is precision-engineered to forge the perfect foundation. A self-drilling screw is a complex fastener that combines the functions of drilling and tapping, requiring a blank with a precisely formed head and a robust, well-defined shank that is optimally prepared for the subsequent thread rolling and drill point grinding. Our self drilling screw cold former specializes in creating this critical blank through a highly efficient and accurate two-strike cold forming process within a single die.
The process is a marvel of precision metal forming. In the first blow, the machine impacts the wire to create the preliminary shape of the screw head and begin the formation of the shank. The second blow then finalizes the head geometry to its exact specifications and completes the upsetting of the shank, ensuring the material grain flow is oriented for maximum strength. This results in a blank with a dense, work-hardened structure, impeccable head shape, and a shank of consistent diameter and volume. This dimensional consistency is paramount, as it provides the ideal, predictable starting point for the downstream thread rolling and drill point machining operations, directly influencing the final screw's quality and performance.
The ability to produce such a high-integrity blank hinges on the machine's unwavering stability and power. The widened, thickened, and fully quenched vertical slide plate guarantees vibration-free sliding, essential for maintaining perfect die alignment during both strikes. The alloy steel-forged slider and the special high-wear-resistant crankshaft deliver the consistent, high-tonnage force required to cold-form the steel wire into a dense and flawless blank. By providing a "perfect embryo," our cold heading machine sets the stage for the creation of self-drilling screws that offer reliable drilling performance, high stripping torque, and exceptional fatigue resistance in the most demanding applications.
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