CN2486252Y - Crescent cutter - Google Patents

Abstract

The utility model relates to a crescent cutter with the cutting edge of the convex die in a crescent form. The crescent cutter of the utility model replaces the uniform stress on the flat edge of the original convex die with the stress on the initial two points and later four points and the unit pressure intensity at the pointed crescent edge is raised by more than 15 times over the die with flat edge so that the shearing pressure intensity is increased by more than 10 times under the same pressure. The utility model is suitable for processing work-pieces in larger sizes under the same pressure, thus making possible the manufacture of portable manual hole-pressing, hole-punching tools and manually-operated punch press.

Description

The crescent cutting knife

The utility model relates to a kind of crescent cutting knife.

Existing traditional cutting knife is flat mouthful convex type mould, this flat mouthful convex type mould is that the convex surface uniform plane is stressed to the shearing force that workpiece applied with matrix film tool relativity the time, therefore it is less to the shear pressure that shearing point produced that is sheared workpiece, just must apply very big active force to the shearing of large aperture workpiece.Therefore it is bigger to shear difficulty.

It is a kind of simple in structure, easy to use that the purpose of this utility model is to provide, and shear effect is good, and safety labor-saving can produce the crescent cutting knife of shear pressure greatly.

The technical solution of the utility model is as follows: the edge of a knife of its convex type mould of crescent cutting knife of the present utility model is crescent.

Stressed to become stressed finally 4 of originally 2 stressed with the uniform plane of flat mouthful of original convex type mould for the crescent edge of a knife of the present utility model, the flat mouthful mould of the unit pressure of crescent moon sharp-crested has increased more than 15 times, make and improved more than 10 times at equal pressure condition down cut pressure, be applicable to the workpiece of the bigger specification of processing under equal pressure condition, make that making portable manual pressure, punching tool and hand punch press becomes possibility.

Fig. 1 is a structural representation of the present utility model.

In order to make the utility model structure clear more complete, the utility model is described in further detail below in conjunction with accompanying drawing.

As shown in the figure: the edge of a knife 1 of convex type mould of the present utility model is crescent, and the radius R of the crescent edge of a knife 1 equals the diameter D of convex type mould 2.

Claims (2)

1 one kinds of crescent cutting knifes is characterized in that: the edge of a knife of its convex type mould is crescent.

2 crescent cutting knifes according to claim 1 is characterized in that: the radius R of the crescent cutting knife edge of a knife 1 equals the diameter D of convex type mould.

Images