Q28.Why does operators have to adjust the vent of cutting fluid?
A:
Materials will generate massive temperature during the cutting process. With correct cutting angles and conditions of cutters, the temperature will be taken away by cuttings. The main purpose of cutting fluid is to decrease the temperature. Many cutters with different sizes might be used during the cutting process, it is common for one to adjust the water column of cutting fluid to the most proper position. It’s better to choose cutters with the function of “central draining” (Of course, the machine shall be equipped with the device for central draining). The higher the draining pressure is, the better the effect will be. The cooling effect and the service life of cutters will be different accordingly.
If the cutter for truing is the tungsten carbide milling cutter, then the equipment with “central draining” cannot be used and you have to adjust cooper pipes or plastic pipes. The another purpose of truing is to wash cuttings away for fear that they might scratch the refined surface, or wash cuttings off knife edges for the fear that they adhere to the knife edges due to the temperature, cause shortening of the service life of cutters and the finished surface won’t be beautiful.
For CNC machines in precision machining, the revolving speed is fast, the amount of feed is few and the temperature would easily rise. With insufficient cutting fluid, the size of workpieces might be incorrect due to heat expansion and cold contraction. In rough machining, the temperature will rise all the same. However, the rough machining will reserve some space for the size of precision machining. Consequently, insufficient cutting fluid under such circumstance won’t cause severe results. Provided the external dimensions of workpieces are small, the cutting fluid will then become a crucial factor. Therefore, the vent of cutting fluid must be adjusted in precision machining so as to obtain effective cooling temperature. Moreover, one shall lubricate the tool nose to achieve the machining precision and surface fineness. Every cutter of a CNC lathe is equipped with fixed water outlet. It means that just several vent shall be adjusted for once and they won’t move even with changed cutters. For CNC milling machines, their water outlets are fixed next to the principal axis and shall be adjusted depending on conditions due to the different lengths of cutters. Additionally, hydraulic pressures shall also be decided according to the workpieces and sizes of cutters. For lathes, especially the inner bores, you must remember that the cutting fluid shall be sprayed on the side of inner bores, instead of the knife edges. In this way, the removal of cuttings won’t be obstructed to cause accumulation.
