The honing brush is a flexible tool for grinding holes. It is called a "mobile grindstone" in foreign countries. It is made of steel wire as a skeleton with neatly arranged nylon filaments extending outwards. Each nylon wire in the honing brush is equipped with a small abrasive ball that is not easily broken. This small abrasive ball is composed of silicon carbide, alumina, boron carbide and other abrasives.
The main use of the honing brush is to clean the fine burrs on the surface of the hole after finishing and greatly improve the smoothness of the inner hole. Its typical applications are: deburring and polishing of groove edges in hydraulic valve holes, cross holes, related holes, cylinder inner hole walls, and some elliptical holes, tapered holes, venturi holes and other special-shaped holes.
It can be processed on a bench drill with a proper stroke, a vertical drill or a lathe or a horizontal grinding machine. When processing bulky and large workpieces, it can be stuck in pneumatic drills and hand drills (speed adjustable) for processing. The speed should be based on the size of the workpiece. Generally, you can choose within 80-120 rpm, and the up and down movement speed is about 20 Times/minute. Generally, it is enough to move up and down 8-10 times. The honing brush must be moved into or out of the processing hole when it is rotated to avoid deformation of the handle. In addition, you can use light lubricating oil (such as kerosene) during processing and just soak it in kerosene. This will not only have a good effect, but also extend the service life of the honing brush. In the selection of the diameter of the honing brush, it is generally 5-15% larger than the processed hole diameter.