Hole-rolling knife

Abstract

The invention discloses a hole-rolling knife which comprises a knife bar and a knife sheath. A regulating gear is screwed on the knife bar; the knife bar is provided with a locking gear which can only slide axially and is arranged above the regulating gear; the knife sheath is sleeved on the knife bar movably and arranged below the regulating gear; the upper end of the knife sheath is provided with a convex shoulder; a plurality of conical rollers which are embedded on the knife sheath and can slide along the radial direction of the knife sheath are annularly distributed at the lower end of the knife sheath; an included angle between the axial lead of each conical roller and the axial lead of the knife bar is the same with the self conicity of each conical roller; the knife bar is provided with a conical surface in contact with the conical rollers; a regulating sleeve is arranged outside the regulating gear and the locking gear; the inner surface of the regulating sleeve is provided with a locking tooth which can be engaged with the locking gear and a regulating tooth which can be engaged with the regulating gear; and a spring with two ends respectively pressing the convex shoulder and the regulating sleeve is externally sleeved on the knife sheath. The hole-rolling knife with the structure has the advantages of simple structure, convenient use, high surface smoothness of inner holes, high compactability of surface textures and capability of improving surface pressure bearing capacity of the inner holes.

Description

technical field [0001] The invention relates to a tool for rolling the wall of a circular hole. Background technique [0002] Bearing holes on iron castings are generally obtained by machining on lathes and boring machines. Due to the high requirements for precision and surface roughness, the existing processing methods are not only difficult to guarantee the roughness requirements, but also after cutting with tools, the bearing holes The tissue compactness of the surface is also destroyed. For example: the roughness drawings of the two bearing holes of the automobile wheel hub are very strict, and the roughness of the bearing mounting holes processed by the lathe cannot meet the requirements of the drawings. When the car is loaded, the outer ring of the bearing also rolls the bearing hole. Due to the low density of the surface of the bearing hole and the poor pressure bearing capacity, the size of the hub bearing hole will gradually increase under the long-term rolling eff...

AI Technical Summary

Problems solved by technology

[0002] Bearing holes on iron castings are generally obtained by machining on lathes and boring machines. Due to the high requirements for precision and surface roughness, the existing processing methods are not only difficult to guarantee the roughness requirements, but also after cutting with tools, the bearing holes The tissue compactness of the surface is also destroyed

For example: the drawing requirements for the roughness of the two bearing holes of the automobile wheel hub are very strict, and the roughness of the bearing mounting holes processed by the lathe cannot meet the drawing requirements

When the car is loaded, the outer ring of the bearing also rolls the bearing hole. Due to the low density of the surface of the bearing hole and the poor pressure bearing capacity, the size of the hub bearing hole will gradually increase under the long-term rolling effect. The outer ring of the bearing is easy to rotate in the bearing hole, causing abnormal noise during driving

Images