Surface treatment process of high-strength corrosion-resistant screw

Abstract

A surface treatment process for a high-strength corrosion-resistant screw comprises the following steps that (1) cold heading forming is conducted, specifically, a stainless steel wire for cold heading is primarily formed through a cold heading mold, a primary product is obtained, and the primary product is subjected to vibration type cleaning for 45-60 min; (2) turning and thread rolling: turning the head of the cleaned primary product by adopting a numerical control turning process; then a thread rolling plate is adopted to conduct thread rolling and straightening machining on the screw blank; (3) surface treatment; and (4) packaging. According to the surface treatment process of the high-strength corrosion-resistant screw, the process steps are reasonable, aiming at the design of the double-end adjusting screw applied to an automobile air inlet system, the problem that the double-end adjusting screw is very easy to bend and collide in the production process due to long threads and thin bolt rod parts is solved, the corrosion resistance is improved through surface treatment, and the service life of the high-strength corrosion-resistant screw is prolonged. The surface cleanliness is high, salt mist meets the 720H red rust-free requirement, the corrosion resistance is excellent, and the application prospect is wide.

Description

technical field [0001] The invention belongs to the technical field of screw surface treatment, and in particular relates to a surface treatment process for high-strength corrosion-resistant screws. Background technique [0002] The screw is a tool for tightening the parts of the object step by step by using the physical and mathematical principles of the oblique circular rotation and friction of the object. Screws are an indispensable industrial necessity in daily life and are widely used. [0003] In the car air intake system, a double-headed adjusting screw is required, as attached figure 1 As shown, the position that needs to be locked by the adjusting nut during the installation process, due to the long adjustment length, the double-ended adjusting screw product needs to have a thread long enough, and the thread needs to have an adjustment function, so the thread surface must be smooth, There must be no bruises of any kind. [0004] Due to the long thread and thin bo...

AI Technical Summary

Problems solved by technology

[0007] Purpose of the invention: In order to overcome the above deficiencies, the purpose of the present invention is to provide a surface treatment process for high-strength corrosion-resistant screws with reasonable process steps. Due to the long thread and thin bolt shank, the screw is very easy to bend and bruise during the production process. The corrosion resistance is improved through surface treatment. The surface is clean and strong. The salt spray meets 720H ​​without red rust, and has excellent corrosion resistance. Corrosion performance, broad application prospects

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