CN209935879U

CN209935879U - High-speed cutting-off tool

Info

Publication number: CN209935879U
Application number: CN201920369723.7U
Authority: CN
Inventors: 李永铎; 陈保春; 徐志成
Original assignee: Jiangxi Normal College
Current assignee: Jiangxi Normal College; Jiangxi Normal University
Priority date: 2019-03-22
Filing date: 2019-03-22
Publication date: 2020-01-14
Anticipated expiration: 2029-03-22

Abstract

The utility model provides a high-speed cutting knife, including tool bit, cutter arbor, tool bit and cutter arbor integrated into one piece, the tool bit scarf joint is in the tool bit, the anterior angle of tool bit is 15 °, and the main relief angle is 3 ~ 5, and this tool bit is opened has the convex chip groove of R3mm and a cutting edge that the width is 2mm, and this cutting edge both sides are provided with R0.3mm's excessive sword, and the sword closed angle between two excessive swords is 120 ~ 150, the preceding inclination of tool bit is 4; the utility model provides a pair of high-speed cutting-off tool passes through and is provided with chip groove, cutting edge and excessive sword on the tool bit, and the front face slope has reduced the unit pressure on the cutting edge, has improved the cutting edge precision, makes the smear metal narrow, the chip removal is smooth, avoids forging a knife, and cutting edge wearing and tearing are even simultaneously, and increase of service life has improved the machined surface finish, reduces the cutter vibration, has increased cutter strength, improves the cutting speed and the feed rate of cutting-off tool to 120 + 150m/min and 0.3 ~ 0.4 mm/r.

Description

High-speed cutting-off tool

Technical Field

The utility model relates to a lathe cutter especially indicates a high-speed cutting off cutter.

Background

In a work machining process, it is often necessary to cut the work with a cutting blade and remove the machined work from a base such as a bar. Because the cutting-off tool is long and narrow, the chip removal space in the machining process is small, so that the cutting is easy to block; in addition, the cutter driving is needed most of the time during machining, and the cutting edge works under the semi-closed condition, so that the phenomena of vibration, cutter binding and the like are easily generated, the damage to the cutter and a workpiece is caused, the cutting speed of a common cutting-off cutter is generally 80-120m/min, and the cutting cannot be carried out more quickly.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

An object of the utility model is to provide a high-speed cutting off cutter has quick chip removal, intensity height, can cut off functions such as fast. In order to achieve the above purpose, the utility model adopts the following technical scheme:

(II) technical scheme

The utility model provides a high-speed cutting-off tool, includes tool bit and cutter arbor, the tool bit scarf joint is in the cutter arbor, the anterior angle of tool bit is 15 °, and main relief angle is 3 ~ 5, the convex chip groove of rolling up of a R3mm is opened at the tool bit top, be equipped with a width cutting edge that is 2mm on the tool bit, and this cutting edge both sides are provided with R0.3mm's excessive sword, and the tool point angle between two excessive sword is 120 ~ 150, the preceding inclination of tool bit is 4.

Further, the lower half part of the cutter bar below the cutter head is in a convex belly shape, and the convex radius is 25-30 mm.

Further, the cutter arbor is 45 steel, and the tool bit is T5 or T15 carbide.

Further, the main back angle is 4 degrees, and the tool tip angle is 150 degrees.

Further, the main back angle is 3 degrees, and the tool tip angle is 120 degrees.

Further, the main back angle is 5 degrees, and the tool tip angle is 130 degrees.

(III) advantageous effects

Compared with the prior art, the utility model has obvious advantages and beneficial effects, particularly, the utility model has the design key points that the tool bit is provided with the chip groove, the cutting edge and the excessive edge, the sharp angle of the tool is 120-150 degrees, the front surface is inclined by 4 degrees, the unit pressure on the cutting edge is reduced, the guiding precision of the cutting edge in the workpiece is improved, the cutting chip is narrowed, the chip removal is smooth, the tool is avoided being beaten, the abrasion of the cutting edge is uniform, the service life is prolonged, the finish degree of the processing surface is improved, the vibration of the tool is reduced, and the strength of the tool is increased; the utility model discloses can improve the cutting speed of cutting off cutter 120 and give other care 150m/min, the feed volume can reach 0.3 ~ 0.4 mm/r.

Drawings

The invention will be further described with reference to the following examples with reference to the accompanying drawings.

FIG. 1 is a front view of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at I;

fig. 3 is a top view of the present invention;

fig. 4 is a partially enlarged schematic view of the point ii in fig. 3.

The reference numbers illustrate:

1. knife bar 2, knife head

21. Chip pocket 22, cutting edge

23. Transition edge gamma₀Front angle

α₀Major relief anglea. Wide cutting edge

Alpha, knife sharp corner

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

The present invention will be further described with reference to the accompanying drawings and the detailed description.

Referring to fig. 1 to 4, a high-speed cutting knife includes a cutting head 2 and a knife bar 1, the cutting head 2 is embedded in the knife bar 1, so as to greatly improve the welding strength, reduce the phenomenon of the separation of the cutting head 2,and allows for increased feed; the rake angle gamma of the tool bit 2₀15-20 DEG, main relief angle alpha₀3-5 degrees, the cutting head 2 is provided with an R3mm arc chip coiling groove 21, the front inclination angle of the cutting head 2 is 4 degrees, and chips are smoothly discharged; a cutting edge 22 with the width of 2mm is arranged on the cutter head 2, and transition edges 23 with the thickness of R0.3mm are arranged on two sides of the cutting edge 22, so that the cutting edge is uniformly worn, the service life is prolonged, and the finish of the processing surface is improved; the edge angle alpha between the two transition edges 23 is 120-150 degrees, unit pressure on the cutting edge 22 is reduced, guiding precision of the cutting edge 22 in a workpiece is improved, chips are narrowed, and tool hitting is avoided.

In order to increase the supporting rigidity and strength of the cutter and reduce the vibration during cutting, the lower half part of the cutter bar 1 below the cutter head 2 is designed to be in a convex-bellied shape, and the convex radius R of the cutter bar is 25-30 mm.

In order to ensure the strength of the cutter head 2 and the toughness of the cutter bar 1, the cutter bar 1 is No. 45 steel, and the cutter head 2 is made of T5 or T15 hard alloy.

The first embodiment is as follows:

the angles of the cutter are selected according to the following numerical values: primary relief angle alpha₀4 degrees and the knife sharp angle alpha is 150 degrees; the tool can keep normal operation under the conditions that the cutting speed v is 120m/min and the feeding amount f is 0.3mm/r, and cooling lubricating fluid is not needed.

Example two:

the angles of the cutter are selected according to the following numerical values: primary relief angle alpha₀3 degrees and the knife sharp angle alpha is 120 degrees; the tool can keep normal operation under the conditions that the cutting speed v is 135m/min and the feeding amount f is 0.35mm/r, and cooling lubricating fluid is not needed.

Example three:

the angles of the cutter are selected according to the following numerical values: primary relief angle alpha₀5 degrees and 130 degrees; the tool can keep normal operation under the conditions that the cutting speed v is 150m/min and the feeding amount f is 0.4mm/r, and cooling lubricating fluid is not needed.

The utility model has the design key points that the tool bit is provided with the chip groove, the cutting edge and the transition edge, the sharp angle of the tool is 120-150 degrees, the front surface is inclined by 4 degrees, the unit pressure on the cutting edge is reduced, the guide precision of the cutting edge in a workpiece is improved, the cutting chip is narrowed, the chip removal is smooth, the tool is avoided being beaten, the cutting edge is uniformly worn, the service life is prolonged, the finish degree of the processing surface is improved, the vibration of the tool is reduced, and the strength of the tool is increased; the utility model discloses can improve the cutting speed of cutting off cutter 120 and give other care 150m/min, the feed volume can reach 0.3 ~ 0.4 mm/r.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any slight modifications, equivalent changes and modifications made by the technical spirit of the present invention to the above embodiments are all within the scope of the technical solution of the present invention.

Claims

1. A high-speed cutting-off tool is characterized in that: the cutting tool comprises a tool bit and a tool bar, wherein the tool bit is embedded and welded in the tool bar, the front angle of the tool bit is 15 degrees, the main rear angle of the tool bit is 3 degrees to 5 degrees, a R3mm arc chip coiling groove is formed in the top of the tool bit, a cutting edge with the width of 2mm is arranged on the tool bit, the two sides of the cutting edge are provided with R0.3mm transition edges, the sharp angle between the two transition edges is 120 degrees to 150 degrees, and the front inclination angle of the tool bit is 4 degrees.

2. The high speed cutoff knife of claim 1, wherein: the lower half part of the cutter bar below the cutter head is in a convex belly shape, and the convex radius is 25-30 mm.

3. The high speed cutoff knife of claim 1, wherein: the cutter arbor is 45 steel, the tool bit is T5 or T15 carbide.

4. The high speed cutoff knife of claim 1, wherein: the main back angle is 4 degrees, and the knife point angle is 150 degrees.

5. The high speed cutoff knife of claim 1, wherein: the main back angle is 3 degrees, and the knife point angle is 120 degrees.

6. The high speed cutoff knife of claim 1, wherein: the main back angle is 5 degrees, and the knife point angle is 130 degrees.