Main features of reverse shave counterdrills:

1. Convenient and quick changing tool head. Adjust the bolt hole drilling, drilling spindle position, makes the tool rod through the bolt hole, and tool rod end face and the part of end face flush, then the tool face cutting edge up, put in the lower part of the bolt hole, turn the cutting tool, cutting tool in the middle of the pole hole and the edge of the alignment, tool rod moves down, through the cutting tool, counterclockwise rotation tool again, in this way, The cutter hangs on the shank; Start drilling machine, lift up the spindle, you can carry out anti-scraping hole processing. Once the sink hole is machined, stop the drilling machine, turn the tool in the opposite direction, lift the spindle of the drilling machine, and remove the tool.

Repeat the above procedure and scrape another countersunk hole.

2. Simple structure. The counterscraping countersink is made up of two parts: the cutter rod and the cutter head, and the structure is simple.

3, in the processing of multiple edges to participate in the cutting, which makes the cutting smooth, tool wear is small, therefore, the cutting parameters can be increased, high production efficiency.

4, good rigidity of knife rod. Because the tool rod is provided with a positioning outer circle matching the inner hole of the parts, when the tool force is large, the tool rod has a strong support,

In order to avoid bending deformation of the tool bar, affect the quality of the counterbore end face.

5, the tool clamping is simple and fast, safe and reliable.

The utility model relates to a reverse shaving drill, which belongs to a hole processing tool and comprises a cutter rod and a cutter. Both sides of the front end of the cutter bar are cut into two planes with equal spacing and two small bevels.

The plane and the inclined plane interact at an Angle α = 45°. The tool is composed of a knife body and a blade. The inner hole on the knife body is a cylindrical hole at the same end as the blade, and the other end is a long waist hole.

The turning direction of the cutting edge is consistent with the inclination direction of the small bevel on the tool bar. The utility model is used for reverse scraping of countersunk holes on the workpiece of complex structure.

Convenient and fast clamping, safe and reliable, good tool strength, long life, can improve production efficiency.