The analysis on wear causes of jin chi of tungsten steel milling cutter
1, tungsten steel milling cutter clamping processing center set tungsten steel milling cutter is mostly adopt spring clip suit way, when used in the cantilever state. In milling process, may sometimes make tungsten steel milling cutter out gradually from the cutter holder, or even fall off completely, the phenomenon of the workpiece scrap, its reason is because general toolholder inner hole and set oil film between tungsten steel milling cutter handle diameter, caused by insufficient clamping force. Set tungsten steel milling cutter are usually coated with anti-rust oil when leaving the factory, if the use of water-soluble cutting oil, when the cutting tool holder inner hole will be attached to a layer of mist of oil film, when there are oil film on the handle and the cutter holder, toolholder are hard to firmly grip the handle loose in processing of neutral tungsten steel milling cutter is easy to fall off. So before make tungsten steel milling cutter clamping, should first will be made of tungsten steel milling cutter handle and cutter holder inner hole wash clean with cleaning fluid, the clamping of the reentry after dry. When the diameter of the tungsten steel milling cutter is larger, even if the handle and cutter holder is very clean, or accident may occur off the knife, at this time should be chosen with made the handle of the gap and the corresponding side lock mode. Set tungsten steel milling cutter clamping is another problem that may occur after processing neutral tungsten steel milling cutter in the cutter holder port broken, its general because of cutter holder to use time is too long, toolholder port department has worn into cone, should replace the new cutter holder at this time.
2, tungsten steel milling cutter's vibration due to the small gap between tungsten steel milling cutter and the cutter holder, so in the process of machining cutter has vibration phenomena may occur. Vibration causes uneven made of tungsten steel milling cutter circular blade turning, and cut the expansion volume increase than original value, affect the machining precision and tool life. Hours but when machining the groove width, can also have the destination to make tool vibration, obtain required by increasing the cutting expansion slot width, but this kind of circumstance should be made of tungsten steel milling cutter maximum amplitude limit under 0.02 mm, otherwise can't be stable cutting. In the normal processing the vibration of the neutral tungsten steel milling cutter as small as possible. When a tool vibration, lower cutting speed and feed rate should be considered, such as both have been reduced by 40% after vibration, there are still large should consider to reduce the turning operations. Such as processing system resonance, the reason may be that smaller excessive cutting speed, feed rate, cutting tool system insufficient rigidity, workpiece clamping force is not enough and the workpiece shape or caused by such factors as the workpiece clamping method, at this time should be taken to adjust, increase in the amount of cutting tool system stiffness, improve the feed speed, etc.
3, set the end of the tungsten steel milling cutter is cutting CNC milling of artifacts, such as in the mould cavity, when the cutting point for concave part or deep cavity, extension set out the amount of tungsten steel milling cutter. If you use a long blade tungsten steel milling cutter, due to large tool deflection, easily lead to tool vibration and wreck. Therefore in the process of machining, if only near the end of the blade for cutting tool, the total length, had better choose the cutting tool long blade type long handle made of tungsten steel milling cutter. In horizontal nc machine tools with large diameter, tungsten steel milling cutter machining deformation resulting from cutting tool weight of larger, more should be very attention to the problem of side of the blade cutting. In long blade must be used under the condition of tungsten steel milling cutter, the need to reduce the cutting speed and feed speed.
4 the selection of cutting speed, cutting parameters choice mainly depends on the material processed workpiece; Feed speed depends mainly on the choice of processed workpiece material and the diameter of the tungsten steel milling cutter. Some tools manufacturers abroad samples with tool cutting parameters selection table, available for reference. But the selection of cutting parameters at the same time, the machine tool, cutting tool system, processed workpiece shape and the influence of various factors such as the clamping way, should be adjusted according to actual condition cutting speed and feed speed. When the priorities for the knives' service life, can be appropriately reduce the cutting speed and feed rate; When the chip from the edge condition is bad, can be appropriately increase cutting speed.
5, the choice of the ways of cutting down milling is beneficial to prevent damage of blade, tool life can be improved. But there are two things need to pay attention to: (1) such as using common machine tool processing, should try to eliminate the gap of can feed mechanism; (2) when the workpiece surface residue of casting, forging process, formation of the oxide film or other hardening layer, appropriate USES conventional milling.
6, the use of tungsten steel milling cutter and the scope of application of high speed steel made tungsten steel milling cutter use requirement is relatively broad, even if the choice of cutting condition slightly improper, will not be too big problems. And when high speed cutting carbide made tungsten steel milling cutter has good wear resistance, but its use scope as high speed steel tungsten steel milling cutter is widespread, and cutting condition must strictly conform to the requirements of the tool to use.