In machining,hole processing accounts for about 1/5 of the total processing amount, and the holes in the hole account for about 30% of the whole hole processing.Compared with the traditional HSS twist drill, the current carbide bit is more and more users with such characteristics as high speed, long life and high precision.There are four main kinds of cemented carbide bits: solid carbide bits,indexable carbide indexable insert bit,welded carbide drill bits and replaceable cutter head carbide bits.Each kind of carbide drill has its advantages in special occasions.

Different types of carbide bit features

Integral cemented carbide drill bits (It can be processed with deep hole and high machining accuracy;Re-ground and reuse, effectively reduce the processing cost.

Carbide indexable insert bits (Discard blade, low cost, easy to change knives;Usually 2D - 6D specification with no centring function;the blade is rich ,The machining accuracy is relatively low.

Replaceable carbide drill bit type (centering function, complete kinds,same tool holder can be installed a variety of the diameter of the cutter c. high machining efficiency, high machining accuracy ,Many kinds of material of rotary cutter for different material,resharpening can further reduce the cost of the cutting tools)

Analysis of the advantages and disadvantages of these carbide bits

Drilling in high speed, high precision, many users choose the hard bit or replaceable carbide bits type, both the bit with the function of self-centering, and high efficiency, high precision drilling, drilling can generally IT6 - IT9 grades.In comparison with the two rigid ratios, the rigidity of the hard bit is better.

However, due to the high cost of considering the whole drill bits,in order to be able to re-grind many times,it is necessary to use a longer solid drill bit,which will weaken the rigidity.And replaceable tungsten carbide drill bitstype can choose the most suitable length of drill pipe,the greatest degree of assurance the rigidity, combined with the convenience of operation, the unit price of the cutting tools is harder than the drill unit price much lower, because of these factors, so more and more users like to use this kind of replaceable tungsten carbide drill bits type.

Because cemented carbide is very precious,use carbide bits correctly,accomplish the use of the material, it is every mechanical worker responsibility.How to use carbide bit correctly,mainly includes the following aspects:

1.Choose the right machine tool

Carbide drill bits can be used in nc machine tools,machining centers and other powerful and steel machine tools,and should ensure that the tip of the blade is beating TIR < 0.02.And the radial drilling, universal milling and other machine tools due to the low power,the spindle precision difference, easy to cause the carbide bit of the early collapse, which should be avoided.

2.Select the correct handle

The spring clamping, the side pressure handle, the hydraulic handle,the heat up the handle and so on can be used, but because the quick change drill clamping grip is not easy enough to cause the drill bit to slip and the failure, should put an end to use.

3.Proper cooling

(1) the cooling should be taken care of in the direction of the cooling,forming the upper and lower terraced configurations, and minimizing the Angle with the cutter as much as possible.

(2) the cold bit should pay attention to the pressure and flow, and prevent the leakage of coolant to affect the cooling effect.

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