A hole opener

Abstract

The utility model provides a kind of trepanning machine, belong to mechanical technical field.It solves the problem of insufficient applicability.The present trepanning machine includes the body being columnar and being equipped with inner hole, inner hole is through the lower end surface of body, the lower end of body is equipped with a plurality of first processing teeth along circumference, body includes at least two straight processing sections along axial direction, the outer diameter of each processing section increases successively from bottom to top, first processing tooth is located on the lowermost processing section, and the lower end of remaining processing section is equipped with a plurality of grooves along circumference, and body forms second processing tooth between two adjacent grooves.It has the advantages such as wide applicability.

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