Tungsten Carbide Countersink — Chipping Factors

During tungsten carbide countersink using, usually appears chipping phenomenon in the initial period for various reasons, so it can reach the service life required. This unusual tool consumption will not only increase the machining of tool costs, but also directly affect the overall processing efficiency. In order to reduce chipping phenomenon and improve tungsten carbide countersink service life, we ought to notice and improve in design, manufacture, and use. First, from the structure design, according to the difference of the surface countersunk, there are some differences in countersink structure designing correspondly, such as the plate countersink structure is suitable for the complete, uniform cutting force and shallow pores of plate; if the cylinder bore with deeper countersink hole is used the sinking bore structure; in addition, there are monolithic and modular countersink. In order to avoid chipping, usually designed to avoid the knife tip is designed to countersink a right angle, and grinding the transition edges or rounded edges.

In the manufacturing process, the quality of tungsten carbide welding blade greatly depends on the service life of tungsten carbide countersink. At present, using a brazing process, it should be noted that prior to welding sandblasting and cleaning with gasoline before removing the oxide film and the surface of the blade to reduce oil sealing off the phenomenon; the follow is to control the welding temperature and cooling rate, heating or cooling too fast too quickly will cause internal countersink knife produce greater stress, which is one cause of blade cracking and chipping. Furthermore, it also need to select milling parameters properly according to the characteristic of the grinding wheel and strictly follow the grinding mill can avoid hollowing edge chipping due to improper use of the tool caused by grinding.

The other one is chipping caused by improper use. It mainly includes two aspects, one is the operation, and the other is the cutting amount. In the working process, countersink will encounter a great impact and unstable, and the working surface will be beating and vibration, then it is prone to chipping and knife fight. The cutting amount or called cutting rate depends on the surface evenness, especially in the initial stage of countersinking.

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