Alloy bit generally refers to carbide bit, integral type, welding type, indexable blade type and replaceable type. The main components of cemented carbides are tungsten carbide and cobalt, etc., which are generally higher in hardness than HRC90 degrees. They are suitable for batch processing and hard processing.

Generally speaking, the length of a common carbide drill bit can be about 320cm according to the value of diameter. If it is of high speed steel material according to diameter can be 500-500 cm, but this is typically used with HSS taper shank chip breaker bit, and this kind of bit for hole of steel structure processing is more, but rarely in high speed steel cold material, domestic currently seem to also have no, and materials out of the factory after the bit processing also need to heat treatment processing, for cold inside aperture influence very big! So, what is common in the market is the hard alloy internal cold drill, so today I would like to share with you the maintenance of the internal cold drill and the matters needing attention to drilling.

(1) after the use of the internal cold drill, it shall immediately check whether there is any damage or passivation, and if there is any bad condition, it shall be immediately ground and dressed;

(2) when stored, the internal cold drill should be seated, so that when it is taken later, it will be convenient to save time and save time to find the internal cold drill again;

(3) when the internal cold drill is used to drill through the hole, when the internal cold drill is about to drill through the hole, the torque is high, so it needs to enter the tool slowly under light pressure to avoid torsion of the internal cold drill due to excessive force.

(4) before drilling, the center point must be made by xu before drilling. The purpose of this point is to accommodate static, avoid contact with the bottom of static point of internal cold drill, and guide the internal cold drill in the correct drilling position.

(5) when drilling, make full use of cutting and pay attention to chip removal;

(6) when drilling cross hole, drill large diameter hole first and then small diameter hole;

(7) the phenomenon of breakage or sudden stop during the drilling of the internal cold drill may be the reason why the feed is too fast, the grinding is quick and hot when drilling;

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