CN2191725Y

CN2191725Y - Cutting tool

Info

Publication number: CN2191725Y
Application number: CN 94205840
Authority: CN
Inventors: 师汉民; 陈永洁; 方宁
Original assignee: Huazhong University of Science and Technology
Current assignee: Huazhong University of Science and Technology
Priority date: 1994-03-30
Filing date: 1994-03-30
Publication date: 1995-03-15
Anticipated expiration: 2004-03-30

Abstract

The utility model provides a new type of cutting tool, the structure of which is that the rake face of the cutting part of the cutting tool is a right-handed Archimedes spiral surface, with a straight edge as its axis, the front angle in the main section changes along the cutting edge, and the cutting edge The rake angle is the largest, and then the rake angle gradually decreases. The tool can not only reliably break chips in the finishing range, but also break the chips into ideal short spiral coils in a large range. It is harmless to the operator and does not damage the processed surface. The utility model can be in various shapes and has extremely wide uses.

Description

Cutting tool

The utility model relates to a kind of cutter.

The hard alloy rotatable throw away chip is because to have a tool-changing speed fast, the crackle that produces in the time of can avoiding sharpening and be convenient to advantage such as cutter automatic management, and, particularly obtain increasingly extensive application in automation and in producing in enormous quantities in actual production.In order to realize chip breaking, the chip breaking that the rake face of indexable throw away chip is made generally in different shape is pickled with grains or in wine.Existing chip-breaker or chip breaking effect are undesirable, and chip breaking range can not satisfy accurately machined requirement, or chip breaking is shaped as the cataclasm bits of " C " type, easily splash, not easy to clean.

Task of the present utility model is to overcome the deficiencies in the prior art part, and a kind of cutter is provided, and can guarantee reliable chip breaking in the fine finishining scope, and make chip breaking become desirable short spiral shell roll-shape.

For finishing above-mentioned task, the solution that the utility model adopts is: the rake face of blade cut part adopts the dextrorotation Archimedes' helicoid, with the linear major cutting edge is its axis, point of a knife place main cross section anterior angle is a positive rake angle, the each point anterior angle changes along blade, point of a knife place anterior angle maximum, anterior angle is gradually little thereafter.

Advantage of the present utility model is:

1, this cutter can not only chip breaking reliably in the fine finishining scope, and can make chip breaking become desirable short spiral shell web-like in a big way, and its length is very neat.

2, this cutter can guarantee that smear metal leaves to the work surface of workpiece, and is harmless in the operator, and do not injure machined surface.

Accompanying drawing is the schematic diagram of a kind of embodiment of the utility model.

Below in conjunction with accompanying drawing the utility model is further described.

A kind of lathe tool as shown in the figure, its structure is that the rake face 1 of lathe tool is the dextrorotation Archimedes' helicoid, linear major cutting edge 2 is the axis of spirality rake face, the anterior angle maximum at point of a knife 3 places, thereafter major cutting edge upper edge point of a knife with a distant place to, anterior angle is gradually little.The variation of anterior angle causes chip removal speed along blade, and promptly the chip width direction changes, thereby causes strong side volume, and chip curling becomes compact spiral shell volume.This spiral shell volume is with the high speed rotation, when its length is increased to critical length, and unstability suddenly then, smear metal is because strong self-excited vibration is got rid of disconnectedly, and this cutter guarantees that chip breaking becomes weak point spiral shell web-like, and length is very neat, is a kind of ideal smear metal form.

Below an example effect of the present utility model can be described.Cutter tool cutting edge angle K _r=90 °, point of a knife radius of circle r _*=0.4mm, the point of a knife 3 anterior angle γ of place ₀=8 °, cutting edge inclination λ _*=4 °, the helical pitch of right hand helix shape rake face is 36mm, i.e. anterior angle γ on the major cutting edge ₀Every millimeter changes 10 °, and the cutter chip breaking range with above-mentioned parameter is: a _P=0.5～2mm, f=0.1～0.3mm.In this chip breaking range, the short spiral shell volume of the broken one-tenth of major part smear metal bits.

Claims

1. A cutting tool, characterized in that: the rake face (1) of the cutting part of the cutting tool is a right-handed Archimedes helical surface, with the linear main cutting edge (2) as its axis, and the main section at the cutting edge (3) The rake angle is a positive rake angle.