Control of dimensional accuracy of thread before electroplating

作者： 富百力五金 时间：2023-01-16 16:55:06 阅读：408

Many rod end plain bearings have thread structure, and the surface of them is mostly coated with electroplated coating for corrosion protection and decoration. How to ensure the thread size qualified after electroplating is a difficult problem in the production process. In the process of long-term production practice, we have mastered some experience in the control of thread electroplating size, which are summarized and summarized here.

The effect of electroplated coating on the geometric parameters of thread assumes that the plating thickness is evenly distributed on the thread, then the effect of plating on the pitch diameter of thread is shown in (for external thread, take the commonly used tooth shape angle of 60 as an example), where: t is the pitch diameter of the thread before electroplating; D1 is the pitch diameter of the thread after electroplating; is the plating thickness; and ad is the unilateral amount of the pitch diameter of the thread after electroplating. Then the total amount of thread pitch diameter after electroplating is d1-d, that is to say, a large number of thread pitch diameter is 4 times of plating thickness. In the same way, internal thread plating, the diameter reduction is also 4 times the thickness of the coating.