In this article, we elaborate on the designs of cutters and drills that are equipped with hard alloy, as the most modern design of the cutting tool.
design of mills
so, starting from the structures of mills and the working conditions of these mills, it can be noted that are widely used in their manufacture or mineral ceramic. Of course, we must not forget that high-performance hard alloys, superhard materials (STM) it is also possible to equip the milling cutter during manufacture.< / span>
Despite the disadvantage of low bending strength and fragility, hard alloys still apply, as have a number of advantages in the milling process. Hard alloys contribute to :
— enabling the form of chips, which has a small thickness and length;
with the discontinuity of the cutting process;
— high rigidity and vibration when cutting.< / span>
the Disadvantages of milling is understandable and obvious. Difficult process struzhkolomy Enough, if you work with terminal, disk and slot cutters. And, as an example, teams of cutters have a high demand to the axial and radial run-out and hence this contributes to the high cost of production.
in order to resolve these and other shortcomings, apply a new brand of materials and hard alloys.
for Example, if we talk about face mills. Main application of SMP is to:
— mounting plates, namely on the housing or on the component parts of the body;
— the use of liners that have two or three bases under plates;
— the use of mechanisms that govern the provision of cutting edges.
— use tangential location of the plates relative to the housing.
tungsten carbide End mills with modern design to have greater flexibility, have an eccentric profile to provide edge strength. These cutters are also versatile and efficient, easily recoverable, meaning that you can use in different areas.
If to speak about milling the heads, then, of course, new solutions are successfully implemented.
So, the new conical milling head carbide have a number of design features such as spiral angles of 20/30°, variable pitch and Central coolant — all this allows to reduce the vibration when cutting. And such structural features as: a large number of teeth and a short cone — enable processing of titanium and heat resistant materials.
Next, we’ll talk about drills.
Hard alloys improve the performance of drills, however, are rarely used. The reasons are unfavourable work conditions during drilling, namely:
— no rigid fixation drills;
large axial loads;
large width of the chip;
— the risk of vibrations;
— low rpm and lack of power, rigidity and precision, which has a drill press.
most Often, drills made of hard alloys used for drilling of: cast iron, non-ferrous metals, marble, brick, plastic. For drilling steel is usually not used due to the fact that the cutting edges very quickly crumble.
the Use of such improvements, internal cooling, etc., allows you to observe good results in the process of drilling of steels and alloys.
to increase the strength and rigidity of drill bits, the cutting length of the drill. Also, to improve the same properties, you can increase the core diameter.
In recent years, often used drill with mechanical fastening of SMP. In order to increase the reliability of drill bits, in the case of performing the hole that fed the coolant to the cutting zone directly.
Carbide drills and cutters, in General, is quite often used, because of its hardness and toughness. If early research and development was aimed at increasing the resistance of the cutting tool , now modernized trends aim to increase the processing accuracy, which is especially important in the manufacture of parts made of expensive materials.