CN111054961A

CN111054961A - Indexable insert and cutter for large-feed milling

Info

Publication number: CN111054961A
Application number: CN201911060436.9A
Authority: CN
Inventors: 谢清亮; 李树强; 袁美和; 谭文清
Original assignee: Oke Precision Cutting Tools Co ltd
Current assignee: Zhuzhou Oukeyi Cutting Tools Co.,Ltd.
Priority date: 2019-11-01
Filing date: 2019-11-01
Publication date: 2020-04-24
Anticipated expiration: 2039-11-01
Also published as: CN111054961B

Abstract

The invention provides an indexable insert for large-feed milling, which comprises an upper surface, a lower surface and five side surfaces, wherein the upper surface is provided with a first groove; the upper surface and the side surface intersect to form a cutting edge; the side surface comprises a main side surface and an auxiliary side surface; the part of the cutting edge, where the upper surface intersects with the main side surface, is a main cutting edge, and the part, where the upper surface intersects with the auxiliary side surface, is an auxiliary cutting edge; the cutting edge is provided with a chamfered surface; the chamfered surface extends towards the center of the blade at a certain angle to form a ligament surface; the ligament surface extends towards the center of the blade at a certain angle to form a rake surface; the center of the indexable insert is provided with a positioning center hole; compared with the traditional 45-degree main deflection angle milling cutter and round blade milling cutter, the invention has the advantages of high processing efficiency and good economy, the cutter can obtain smaller radial component force, and the milling cutter is suitable for long overhang processing and has simple structure. The blade of the invention also optimizes the cutting edge and the chip removal groove, ensures that the blade has low cutting resistance and good chip removal effect in large-feed machining, and can prevent edge breakage.

Description

Indexable insert and cutter for large-feed milling

Technical Field

The invention relates to the field of metal cutting machining, in particular to an indexable blade and a cutter for large-feed milling.

Background

In the field of milling, the traditional 45-degree main deflection angle cutter and the cutter provided with the circular blade are widely applied, and have good cutting effects in face milling and cavity milling. However, the machining field turns to high-efficiency high-speed machining, and the traditional 45-degree main deflection angle cutter and the circular blade cutter are limited in the rough machining field with high metal removal rate, so that the requirements of users cannot be met. Mainly because of the increase of the feeding amount, the cutting resistance is obviously increased when the traditional 45-degree main deflection angle cutter and the milling cutter provided with the circular blade are milled, the machine tool is seriously shaken, and the cutter can be rapidly damaged, even the precision of the machine tool is reduced.

Chinese patent CN201080031714.9 discloses a negative-type milling insert having a substantially pentagonal shape with five long sides, the principal run-off angle of which is set between 45 ° and 50 °. The blade is optimized on the basis of a traditional main deflection angle of 45 degrees, and is provided with a secondary cutting edge which is preferably below 20 degrees, the design can reduce the cutting resistance in high feed under the cutting condition with small cutting depth, but the main cutting edge still bears large cutting force when the high feed cutting is carried out with large cutting depth, the cutter also has large radial component force in cutting, and the cutter is easy to shake when the cutter is hung for a long depth, and the factors can cause the blade to be quickly worn and even break.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a large-feed indexable insert and a cutter which have the characteristics of small radial force during machining, high machining efficiency, better economy and the like.

The invention adopts the following technical scheme:

an indexable insert for large feed milling comprising an upper surface, a lower surface, five side surfaces; the upper surface and the side surface intersect to form a cutting edge; the side surface comprises a main side surface and an auxiliary side surface; the part of the cutting edge, where the upper surface intersects with the main side surface, is a main cutting edge, and the part, where the upper surface intersects with the auxiliary side surface, is an auxiliary cutting edge; the cutting edge is provided with a chamfered surface; the chamfered surface extends towards the center of the blade at a certain angle to form a ligament surface; the ligament surface extends towards the center of the blade at a certain angle to form a rake surface; the upper surface comprises a boss; the front cutter face is connected with the boss through an arc surface to form the bottom of the upper surface which gradually extends to the lower surface along the direction of the main cutting edge; the center of the indexable insert is provided with a positioning center hole.

The indexable insert of claim 1, wherein the width W of the chamfered surface ranges from 0.1mm to 0.3mm, the angle α between the chamfered surface and the base surface ranges from 10 ° to 20 °, the width b of the ligament surface ranges from 0.1mm to 0.3mm, the angle θ between the ligament surface and the base surface ranges from 0 ° to 3 °, and the rake angle β of the indexable insert ranges from θ ° to 15 °

Further, the angle and the width of the chamfer surface on the main cutting edge are not less than those on the auxiliary cutting edge.

Further, the height of the boss is not higher than the secondary cutting edge by 0.2mm at most and not lower than the secondary cutting edge by 0.5mm at least.

Further, the side surface forms an angle γ with the thickness direction of the indexable insert, and γ ranges from 10 ° to 20 °.

Further, the auxiliary side surface is a single arc surface or a combined surface of the arc surface and the plane.

Further, when the auxiliary side surface is a combined surface of an arc surface and a plane, the auxiliary cutting edge comprises a flat edge formed by intersecting the middle plane and the upper surface of the auxiliary side surface.

Further, the smoothing edge is connected with the main cutting edge through a transition arc edge; the transition arc blade is provided with a chamfer surface, and the width of the chamfer surface is greater than that of the chamfer surface on the main cutting edge.

Based on the technical scheme, the invention provides a cutter for large-feed milling, which comprises a milling cutter main body, wherein a plurality of blade grooves and chip grooves are formed in the periphery of the milling cutter main body; the indexable insert of the technical scheme is detachably mounted in each insert groove, and the main deflection angle kappa of the indexable insert ranges from 18 degrees to 20 degrees. (ii) a The insert pocket includes a pocket bottom support surface, a threaded bore; said threaded bore extending perpendicularly rearwardly from said slot bottom support surface; the milling cutter body further comprising a pocket side wall in contact with a major side of the indexable insert; clearance grooves are arranged between the side walls of the grooves and the supporting surface of the bottom of the groove; the groove side wall and the groove side wall form an inner obtuse angle.

The invention provides a large-feed milling indexable insert which has the advantages of high processing efficiency and good economy compared with the traditional 45-degree milling cutter and round insert milling cutter, and the cutter has balanced axial and radial cutting forces and simple structure. The blade of the invention also optimizes the cutting edge and the chip removal groove, ensures that the blade has low cutting resistance and good chip removal effect in large-feed machining, and prevents edge breakage.

Drawings

A front view of an indexable milling insert in the embodiment of fig. 1;

fig. 2 is a top view of an indexable milling insert in an embodiment;

fig. 3 is a left side view along an indexable milling insert;

fig. 4 is a perspective view of an indexable milling insert in an embodiment;

FIG. 5 is a sectional view taken along line G-G of FIG. 2;

FIG. 6 is an enlarged view of a portion of FIG. 7;

fig. 7 shows a schematic view of the milling operation of the indexable milling cutter in the embodiment;

fig. 8 shows a schematic view of a seat structure of an indexable milling tool in an embodiment.

Detailed Description

The invention is further described with reference to the following figures and examples. In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and the like are used in the indicated orientations and positional relationships based on the orientation shown in the drawings for convenience in describing the invention and simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be considered as limiting.

Example 1

As shown in fig. 1 to 6, the present embodiment provides an indexable insert that is pentagonal-like, including an upper surface 2, a lower surface 4, and five side surfaces 3; wherein the upper surface 2 and the side surface 3 intersect to form a cutting edge 5; the side surface 3 comprises a major side surface 31 and a minor side surface 32; the part of the cutting edge where the upper surface 3 intersects with the major side surface 31 is a major cutting edge 51, and the part where the upper surface 2 intersects with the minor side surface 32 is a minor cutting edge 52; the included angle between the side surface 3 and the thickness direction of the indexable insert is gamma, the range of gamma is 10-20 degrees, the minor side surface 52 in the embodiment is a combination surface of an arc surface and a plane, the minor cutting edge 52 comprises a smoothing edge formed by the intersection of the plane in the minor side surface 32 and the upper surface 2, when the minor side surface 52 is a whole large arc surface close to the plane, the minor cutting edge 52 can also form a smoothing edge, the smoothing edge can play a role in improving the quality of a machined surface, and plays a role in good transition between the major cutting edges, so that the impact resistance of the tool nose is improved.

The wiper edge is connected with the main cutting edge 51 by a transition circular arc edge 54; the transition circular arc edge 54 is provided with a chamfer surface, the width of the chamfer surface is larger than that of the main cutting edge 51, the strength of the transition part is enhanced, and the blade is ensured not to be broken easily.

The cutting edge 5 is provided with a chamfer surface 7, wherein the chamfer surface angle and the width on the main cutting edge 51 are not smaller than those on the secondary cutting edge 52, the strength of the main cutting edge responsible for the main cutting work is higher, the chamfer surface 7 extends towards the center of the insert at a certain angle to form a ligament surface 8, and the ligament surface 8 continues to extend towards the center of the insert at a certain angle to form a rake face 9, wherein the width W of the chamfer surface 7 ranges from 0.1mm to 0.3mm, the included angle α between the chamfer surface 7 and the base surface ranges from 10 degrees to 20 degrees, the width b of the ligament surface 8 ranges from 0.1mm to 0.3mm, the included angle theta between the ligament surface 8 and the base surface ranges from 0 degrees to 3 degrees, the rake angle β of the insert ranges from theta to 15 degrees, the arrangement of the chamfer surface 7 and the ligament surface 8 effectively improves the stability of the cutting edge, and α, theta, β balances the strength and sharpness of the insert, particularly, when milling is carried out, the material is very much more efficient, the cutting action of the cutting edge cutting temperature and the cutting resistance of the cutting edge of the insert are increased, or the cutting action of the cutting edge of the cutting is increased, the cutting resistance of the cutting edge of the cutting is increased, the cutting edge of the cutting edge is increased, the cutting action of the cutting edge is increased, the cutting action of the cutting edge cutting temperature of the milling action of the milling insert is increased, the cutting edge is increased, the cutting action of the milling insert is increased, the cutting action of the cutting edge is increased, the cutting action of the milling action of the cutting edge is increased, the milling action of the.

The upper surface of the blade comprises a boss 41, the front tool face is connected with the boss 41 through an arc surface 42 to form the bottom of the upper surface which extends towards the lower surface gradually, the height of the boss 41 is not higher than the secondary cutting edge by 0.2mm at most and not lower than the secondary cutting edge by 0.5mm at least, when the boss is too high, the chip containing space of the blade is reduced, excessive cutting deformation is obtained by the cutting blade, the cutting resistance is increased, and tool vibration is easily caused; when the boss was crossed lowly, the smear metal can't obtain sufficient deformation when flowing through the blade groove, and the smear metal can not normally curl, unable normal discharge, especially when the soft material of smear metal, the chip removal effect of blade has been promoted in the above setting in this embodiment.

Example 2

In the embodiment, a tool 10 for large feed milling is provided, which includes a milling tool body 11, wherein a plurality of insert grooves 12 and chip grooves 13 are arranged on the periphery of the milling tool body 11; the indexable insert 1 described in embodiment 1 is detachably mounted in each insert pocket 12, and the principal rake angle κ of the indexable insert 1 ranges from 18 ° to 20 °. (ii) a The insert pocket 12 includes a pocket bottom support surface 14, a threaded bore 15; a threaded hole 15 extends perpendicularly rearward from the groove bottom support surface 14; the milling cutter body 11 further comprises

groove side walls

16, 17 in contact with the main sides of the indexable insert 1; clearance grooves 18 are arranged between the

groove side walls

16 and 17 and the groove bottom supporting surface 14; the groove side wall 16 forms an obtuse internal groove angle with the groove side wall 17.

Based on the structure of the indexable insert 1, when the large feed milling tool 10 proposed in the present embodiment is used, the major rake angle of the indexable insert can be limited to 18 ° to 20 °, and the working length of the major cutting edge is increased, the load per unit length of the major cutting edge is reduced, the tool wear is small, the durability is improved, and the chip thickness is reduced without excessively increasing the radial cutting force.

It should be understood that the above examples are only for clearly illustrating the technical solutions of the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An indexable insert for large feed milling, characterized in that it comprises an upper surface (2), a lower surface (4), five side surfaces (3); the upper surface (2) and the side surface (3) intersect to form a cutting edge (5); the side surface (3) comprises a main side surface (31) and a secondary side surface (32); the part of the cutting edge where the upper surface (3) intersects the major side surface (31) is a major cutting edge (51), the part where the upper surface (2) intersects the minor side surface (32) is a minor cutting edge (52), and the major cutting edge extends between two adjacent minor cutting edges in a manner gradually approaching the lower surface 4; the cutting edge (5) is provided with a chamfered surface (7); the chamfered surface (7) extends towards the center of the blade at a certain angle to form a ligament surface (8); the ligament surface (8) extends towards the center of the blade at a certain angle to form a rake surface (9); the upper surface (3) comprises a boss (41); the rake face (9) is connected with the boss (41) through an arc surface (42) to form the bottom of the upper surface (2) which gradually extends towards the lower surface (4) along the direction of the main cutting edge; the center of the indexable insert is provided with a positioning center hole (6).

2. The indexable insert according to claim 1, wherein the width W of the chamfered surface (7) ranges from 0.1mm to 0.3mm, the angle α between the chamfered surface (7) and the base surface ranges from 10 ° to 20 °, the width b of the ligament surface (8) ranges from 0.1mm to 0.3mm, the angle θ between the ligament surface (8) and the base surface ranges from 0 ° to 3 °, and the rake angle β of the indexable insert ranges from θ ° to 15 °.

3. Indexable insert according to claim 1, characterized in that the chamfer angle and width on the main cutting edge (51) are not smaller than the chamfer angle and width on the minor cutting edge (52).

4. Indexable insert according to claim 1, characterized in that the height of the boss (41) is not higher than the minor cutting edge by 0.2mm at the maximum and not lower than 0.5mm at the minimum.

5. Indexable insert according to claim 1, characterized in that the side surface (3) forms an angle γ with the thickness direction of the indexable insert, γ being in the range of 10 ° to 20 °.

6. Indexable insert according to claim 1, characterized in that the minor side surface (32) is a single circular arc surface or a combination of circular arc and plane surfaces.

7. The indexable insert according to claim 7, wherein the minor side surface (32) is a combination of a circular arc surface and a plane surface, and the minor cutting edge (52) comprises a wiper edge formed by the intersection of the plane surface of the minor side surface (32) and the upper surface (2).

8. The indexable insert of claim 8, wherein the wiper edge and the main cutting edge are connected by a transition circular edge (54); the transition arc edge (54) is provided with a chamfer surface, and the width of the chamfer surface is greater than that of the chamfer surface on the main cutting edge.

9. A tool for large feed milling, characterized by comprising a milling tool body (11), the periphery of the milling tool body (11) being provided with a plurality of insert pockets (12) and chip flutes (13); an indexable insert (1) according to any one of claims 1-9 is detachably mounted in each insert pocket (12), the indexable insert having a principal rake angle k in the range of 18 ° to 20 °; the insert pocket (12) comprises a pocket bottom support surface (14), a threaded bore (15); the threaded bore (15) extending perpendicularly rearwardly from the slot bottom support surface (14); the milling cutter body (11) further comprising pocket side walls (16, 17) in contact with indexable insert major side surfaces (31); clearance grooves (18) are arranged between the groove side walls (16, 17) and the groove bottom supporting surface (14); the groove side wall (16) and the groove side wall (17) form an obtuse internal groove angle.