self-lubricating bushing

Many people think that by drilling a few holes in the copper bushing and then installing graphite, he will become a self-lubricating copper bushing. Not really! There's a lot of knowledge in this! The first is the choice of copper. Not all copper is suitable for self-lubricating copper bushings, Colliers brass, aluminum bronze and tin bronze can be, the latter two of which are better, but also more expensive, while Colliers brass is more cost-effective, so it is more widely used. Of course, this refers to the new electrolytic copper material, the effect of recycling copper. This is followed by graphite material. The graphite used for self-lubricating is not the so-called "all-natural" one. Generally, it is pressed with graphite powder with PTFE powder and talc. The finer the graphite powder used, the denser the pressing, the softer the finished product, and the easier it is to form a lubricating film in the later use process, and the better the effect will be. Again, the design. There are many things about how much graphite to use, how big to use, and how to arrange them. The size of graphite is generally selected according to the inner diameter of the bushing, in simple terms, large graphite is used for large diameters, and small graphite is used for small diameters. As for how much to use, the area of all graphite and about 20% of the inner surface area of the shaft bushing works best. Finally, let's look at the arrangement of graphite, it is closely related to the way you move, and the arrangement of graphite in rotational and linear motion is completely different. Don't believe those manufacturers tell you that their products are suitable for any movement, everything can be neat and everything is not good, and in most cases your working conditions are one, either rotating and swinging, or straight line. Well, I will probably write so much about the graphite copper bushing, I hope it will be helpful to everyone, so that more people can understand self-lubricating bearings.