An auxiliary device for electroplating hard chrome in the inner hole of a slender cylindrical part.

By designing an auxiliary device and a specific electroplating process, the problem of uniformity in hard chrome plating of the inner hole of slender cylindrical parts was solved, achieving efficient and low-cost electroplating production and ensuring product quality.

CN224280537UActive Publication Date: 2026-05-26YIBIN SANJIANG MACHINERY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
YIBIN SANJIANG MACHINERY
Filing Date
2025-05-20
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Traditional immersion chrome plating technology struggles to achieve a uniform coating on the inner surface of slender cylindrical parts, resulting in uneven longitudinal film thickness, coarse crystals, and poor surface finish. This increases production costs and time, and fails to guarantee product quality.

Method used

Design an auxiliary device including a hook, a connecting guide plate, a hollow outer nut, an insulating guide sleeve, and an auxiliary anode. By adjusting the fit between the hollow outer nut and the hollow stud, ensure the uniformity and integrity of hard chrome plating on the inner hole of the slender cylindrical part. The auxiliary anode conducts electricity at the center position inside the cylinder. A uniform chrome plating layer is formed by using a specific current density and electroplating process.

Benefits of technology

It improves the production efficiency of hard chrome plating in the inner holes of slender cylindrical parts, shortens the production cycle, ensures the uniformity and integrity of the plating layer, reduces production costs, and is suitable for the electroplating production of cylindrical parts of various specifications.

✦ Generated by Eureka AI based on patent content.

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Abstract

This utility model discloses an auxiliary device for electroplating hard chrome in the inner hole of a slender cylindrical part. It includes a hook, a connecting guide plate, a hollow outer nut, three insulating guide sleeves, a hollow stud, and an auxiliary anode. The connecting guide plate has two through holes. The hook includes a bent hook portion and a long shaft portion. The long shaft portion passes through hole one and is welded to it. The bottom of the long shaft portion is welded to the outer circle of the hollow outer nut. One end of the hollow outer nut near the connecting guide plate has a third through hole along its central axis, and the other end has an internal thread. The hollow stud has a fourth through hole along its central axis and an external thread on its outer side. Through holes two, three, and four are coaxial and have the same diameter, and each has an insulating guide sleeve. The auxiliary anode passes sequentially through the insulating guide sleeves in through holes two, three, and four. This device is simple in design, easy to manufacture, convenient to operate, highly modifiable, and can be combined in various ways. It has low cost, simple adjustment and replacement operations, and strong rapid response capability for production.
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