Milling cone: a casing window milling tools, the main face is on the side of carbide blade knife. Side of the drill used a single cone-type milling milling milling cone and double cone.
The basic requirements of the milling cone is: windows fast, good wear resistance, the geometry is conducive to cutting, the cutting load is small, easy to sticking, easy to row off. Milling diameter cone drill bit as much as possible with the naked eye the same diameter, so that windows do not expand after the eye. Double-taper milling cone cone from the four different components. The next level is a cone head, taper 2 ° ~ 3 ° with the bottom of the cutting edge, its role is to guide the milling milling into the cone, to prevent the advance slide bushing; second taper of 6 ° ~ 10 °, the length of the blade long, is down to the main section of casing milling; third paragraph of the cone slope gradient and directional control is basically the same, its role is to stabilize the cone to expand the window milling; the most on a taper to zero, the main role is to repair the window.
In the double cone milling out the window, a single cone-type milling tool is to continue to lengthen the window, the main face is the bottom of the blade, the side slope gradient and directional control the same side of the blade from the expanded role, it can be directed along the inclined plane device lengthen the window to the maximum position.