Abstract: Countersink is a kind of drilling for countersink conical countersunk hole, countersink has more cutter teeth, in order to form the hole end processing into the required shape, used for processing all kinds of countersunk head screw hole, or flat hole outer end face. Radial countersinks are divided into three types: cylindrical countersinks, cone countersinks and face countersinks. Countersink drilling is the surface of the hole for flat, cylindrical, conical and other surface processing. Shaving drill is used when processing cylindrical countersunk head holes, conical countersunk head holes and face boss on the machined holes.
What specifications are available for shaving drill
There are 60°, 82°, 90°, 100°, 110° and 120° for the taper counterboring.
Type of countersunk drill-Countersink Drill Bit
Radial countersinks are divided into three types: cylindrical countersinks, cone countersinks and face countersinks.
1, cylindrical countersink drill used for countersink cylindrical countersink.
The main cutting function of the column counterboring is the end face blade, and the bevel Angle of the spiral groove is its front Angle. The countersink has a guide column at the front, the guide column diameter and the workpiece existing hole for tight clearance fit, to ensure good centering and guidance. The guide columns are detachable and can also be incorporated into the countersink. (Generally that is countersunk knife, on the cylindrical countersunk head).
2, taper shaving drill for shaving taper holes.
Taper Angle according to the requirements of the workpiece taper countersunk hole, there are 60°, 75°, 82°, 90°, 100°, 120° and so on. Among them, 90° is the most used.
3, face shaving drill is specially used for facing flat orifice.
Countersink can ensure the verticality of the hole face and the center line of the hole. When the processed aperture is small, in order to maintain a certain strength of the cutter bar, the diameter of the head of the cutter bar can be matched with the processed hole as a gap to ensure a good guiding effect.
Countersink is a standard tool, produced by a professional factory, can be selected according to the types of countersink, or twist drill can be changed into grinding countersink.
Countersink the role
Countersink drilling is the surface of the hole for flat, cylindrical, conical and other surface processing. Shaving drill is used when processing cylindrical countersunk head holes, conical countersunk head holes and face boss on the machined holes.
Flat sink Counterbore (English name Counterbore), its circumference and end face each have 3~4 cutter teeth, in the processed hole into the guide column, its role is to control the coaxial error of the sink and the original hole. Guide columns are generally made detachable in order to facilitate the manufacturing and grinding of the countersink face teeth.