In the process of scraping and hobbing knife operation, there are often some problems such as the size accuracy, appearance quality and tool life of the machined parts. How to reduce and even prevent these problems is an urgent problem.
First of all, we need to know why there is such a problem? What are the causes? According to the experiment, it is concluded that the deviation of the hole before reaming, especially when the hole diameter is small, can't correct the original curvature because of the poor rigidity of the reamer. The reason is that the deviation of the hole before reaming, especially when the hole diameter is small, can't correct the original curvature because of the poor rigidity of the reamer.
The application of the scraping and calendering knife in the thin-walled pipe processing, when the pipe fittings are processed with the scraping and calendering knife, they need to have enough wall thickness. The wall thickness should be calculated from one side, which is different according to the hardness of different materials. For example, the wall thickness of steel parts can be slightly thinner than 2mm, while the wall thickness of copper and aluminum parts needs to be more than 3mm. If the wall is too thin, it will lead to the deformation of the workpiece, uneven stress, and even be damaged by extrusion stress.
Scraping hob rolling processing is to use roller rolling to stop processing, which will produce fine dust. At this time, fine dust will not only affect the appearance quality, but also accelerate the loss of rolling head, so it is necessary to inject a large amount of cutting fluid to eliminate dust.
Therefore, the cutting fluid should be used in the scraping hob rolling process, and attention should be paid to the selection of cutting fluid. The cutting fluid with low viscosity and high viscosity has good smoothness, but the cleaning performance is poor, so it is not suitable for rolling process.