Process for local electroplating of internal threads of nut

Abstract

Provided is a process for local electroplating of internal threads of a nut. The workpiece nut is completely electroplated, and then protection, abrasive blasting, shot blasting, disassembly and aftertreatment are carried out. The process comprises the steps of pretreatment of the workpiece nut, electroplating, tool protection of the internal threads, abrasive blasting for removing plating layers on the outer surface, shot blasting for improving the surface smoothness of the part, disassembly, and aftertreatment. A protection tool is made of a nylon material and is in close fit through threads, and the two ends for tool protection are tightened in the protection process so that the protection tool can be prevented from falling and damaging plating layers of the internal threads in the abrasive blasting and shot blasting processes; the batches of plating layers can be rapidly removed through abrasive blasting, and the glossiness of the surface of the part can be improved and the roughness of the surface of the part can be reduced through shot blasting. The process is easy and convenient to implement, high in efficiency, free of plating missing, discoloration, corrosion and plating layer unevenness, low in cost, small in pollution, capable of achieving the qualified rate higher than 99% and high in universality, and can be applied to local electroplating of internal thread or external thread fasteners.

Description

technical field [0001] The invention relates to a process method for partial electroplating of internal threads of nuts, and is mainly aimed at the electroplating process of internal threads of nut products. Background technique [0002] In the mechanical processing industry, the standard nuts and self-locking nuts widely used in aviation, aerospace, shipbuilding and other industries have many specifications, large quantities and high requirements, while the standard parts of aviation, aerospace and other engines require internal threads to be electroplated Plating is not allowed on other surfaces; nuts and self-locking nuts used in aviation, aerospace and other industries are small in size, large in number, many in variety, and relatively complex in structure; commonly used partial electroplating methods include tape winding method and protective paint method , Acid-base removal method and other methods; the process flow is: pre-treatment, protection (protection of the o...

AI Technical Summary

Problems solved by technology

[0003] The above method is difficult to operate, low in efficiency, and it is easy to cause missing plating, parts discoloration, corrosion, uneven coating, etc., and the pass rate is low; paint, acid, alkali and other substances in the operation process are very harmful to human body and environmental pollution; can not Meet the requirements of mass production

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