Countersunk head cross-shaped self-drilling screw and preparation technology thereof

Abstract

The invention discloses a countersunk head cross-shaped self-drilling screw and a preparation technology thereof. The countersunk head cross-shaped self-drilling screw comprises a pan head, a screw rod, a self-drilling part, a steel sheet and a waterproof pad; one end of the screw rod is fixedly connected with the pan head; the other end of the screw rod is fixedly connected with the self-drillingpart; the pan head adopts a cylindrical hexagonal structure or a circular countersunk head structure; a cross-shaped pan opening is formed in the upper surface of the pan head; the steel sheet is installed below the pan head; a through hole is formed in the steel sheet and is in fit with the screw rod coaxially; a shaft hole is formed in the waterproof pad; the upper end of the waterproof pad isin fit with the lower end of the steel sheet; the shaft hole is in fit with the screw rod coaxially; and threads arrayed equidistantly are formed in the screw rod. The self-drilling screw is high in rust prevention capability; the corrosion-resistant life can achieve the complete effect; and the steel sheet is installed below the pan head, the upper end of the waterproof pad is bonded with the lower end of the steel sheet, and the shaft hole is in fit with the screw shaft coaxially, so that the self-drilling screw has the enough intensity and a waterproof function, the stable working performance of the self-drilling screw is ensured, and the service life is prolonged.

Description

technical field [0001] The invention belongs to the technical field of fasteners, and in particular relates to a countersunk head cross-drilling screw and a preparation process thereof. Background technique [0002] Fasteners are a general term for a type of mechanical parts used to fasten two or more parts (or components) into a whole. They are widely used in various machinery, equipment, vehicles, ships, railways, Bridges, buildings, structures, tools, instruments, chemicals, instruments and supplies, etc., are characterized by a wide variety of specifications, different performances and uses, and a high degree of standardization, serialization, and generalization. [0003] Screw is one of the most commonly used fastening parts. It uses the physical and mathematical principles of the oblique circular rotation and friction of the object, and is a tool for fastening the mechanical parts of the object step by step. Drilling screw is a new invention of people in recent years....

AI Technical Summary

Problems solved by technology

[0004] There are still certain problems in the existing drill tail screws. When the drill tail screws are drilled in, the drill tail screws are easy to slip when locked, and it takes time and effort; the existing drill tail screws have poor sealing performance, and exte

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