CN104014860A - Fine finishing milling blade and milling cutter - Google Patents

Abstract

The invention discloses a finishing milling blade and a milling tool thereof. The finishing milling blade comprises a polygonal plate-shaped blade body. The blade body comprises an upper surface, a lower surface and a plurality of side surfaces connecting the upper surface and the lower surface. The surfaces intersect to form a plurality of cutting edges, at least one arched cutting edge is provided in the plurality of cutting edges, the high convex point on the arched cutting edge is located between the two ends of the arched cutting edge, at least one of the arched cutting edges The distance H between the end point and the high convex point along the circumferential direction of the arched cutting edge is not less than 0.05mm, the radius of curvature at the high convex point is R, and 200mm≤R≤1500mm, the finishing milling insert of the present invention has high machining accuracy And the advantages of small cutting vibration. The milling tool includes a cutter body, which is provided with a first sipe, and also includes the above-mentioned finishing milling blade, and the blade body of the finishing milling blade is fixedly arranged in the first sipe, and the milling cutter of the present invention has a corresponding processing accuracy. High and low cutting vibration advantages.

Description

A finishing milling insert and its milling tool

technical field

The invention relates to a cutting tool, in particular to a finishing milling insert and a milling tool thereof.

Background technique

Milling tools usually adopt a structure with only one finishing blade or two types of finishing blades and main cutting blades to realize the finishing of milling tools. With the rapid development of the manufacturing industry, the finishing milling tools require more and more The higher the processing quality, the surface roughness of the processed workpiece is even required to be below Ra0.4. With such a high surface quality requirement, even if there is a small oblique angle with the horizontal direction when the linear cutting edge is fed, it will still cause The quality of the machined surface is not ideal. In theory, when the straight cutting edge is completely horizontal, it can meet the requirements of finishing. However, due to the existence of manufacturing and assembly errors, it is difficult to make the straight cutting edges of multiple finishing milling inserts on the milling tool completely horizontal. Therefore, it is difficult to realize the finishing of milling tools with straight cutting edges, and it is difficult to be widely used.

In order to facilitate use and reduce manufacturing difficulty in the industry, a finishing milling insert with an arc-shaped cutting edge can be set on the milling tool. When using an arc-shaped cutting edge for finishing, the precision requirements for manufacturing and assembly can be reduced. In order to improve the versatility, but in the actual use process, in order to improve the quality of the processed surface, the radius of the arc-shaped cutting edge often needs to reach 500mm or more. The internal force is relatively large, and it is easy to generate vibration during cutting. At the same time, when the cutting width of the workpiece is larger than the diameter of the milling cutter head during face milling, multiple cuttings are required to complete the surface processing. When , steps are easily formed on the adjacent two milling surfaces.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a finishing milling insert and milling cutter with high machining precision, high machining surface quality and low cutting vibration.

In order to solve the problems of the technologies described above, the present invention adopts the following technical solutions:

A finishing milling insert includes a polygonal plate-shaped insert body, the insert body includes an upper surface, a lower surface and a plurality of sides connecting the upper surface and the lower surface, the sides intersect with the upper surface to form multiple a plurality of cutting edges, at least one arched cutting edge is provided in the plurality of said cutting edges, the high convex point on said arched cutting edge is located between the two end points of said arched cutting edge, said arched cutting edge The distance H between at least one end point of the blade and the high convex point along the circumferential direction of the arched cutting edge is not less than 0.05mm, and the radius of curvature at the high convex point is R, and 200mm≤R≤1500mm.

As a further improvement of the above technical solution:

The radius of curvature at at least one of the endpoints is r, and 30mm≤r≤150mm.

The arched cutting edge is a smooth curve with a continuously changing radius of curvature, and the radius of curvature of the central portion of the arched cutting edge is greater than the radius of curvature of both ends.

The arched cutting edge is an elliptical arc.

The arched cutting edge is a smooth curve composed of more than two circular arcs with different radii and different lengths.

A mounting hole is opened on the blade body.

A milling cutter includes a cutter body, on which a first sipe is opened, and the milling cutter also includes the above-mentioned finishing milling blade, and the blade body is fixedly arranged in the first sipe.

As a further improvement of the above technical solution:

The milling tool also includes a first fastener securing the insert body within the first flute.

The cutter body is also provided with a second sipe, and the milling tool further includes a main milling insert fixedly arranged in the second sipe.

The cutting depth of the arched cutting edge is H1, the cutting depth corresponding to the main milling insert and the arched cutting edge is H2, and 0.02mm≤H1-H2≤0.15mm.

A blade adjustment mechanism is provided in the first sipe, and the cutting depth H1 of the blade body can be adjusted through the blade adjustment mechanism.

Compared with the prior art, the present invention has the advantages of:

(1) The finishing milling insert of the present invention includes a polygonal plate-shaped insert body, the insert body includes an upper surface, a lower surface, and a plurality of sides connecting the upper surface and the lower surface, and the side surfaces intersect with the upper surface to form a plurality of cutting edges, At least one arched cutting edge is provided among the plurality of cutting edges, the high convex point on the arched cutting edge is located between two end points of the arched cutting edge, and the edge between at least one end point of the arched cutting edge and the high convex point is The distance H in the circumferential direction of the arched cutting edge is not less than 0.05mm, the radius of curvature at the high bump is R, and 200mm≤R≤1500mm, the finishing milling insert in the present invention can ensure the processing Surface quality can effectively eliminate residual steps between adjacent milling widths, and can also reduce the contact length between the arched cutting edge and the workpiece, thereby reducing cutting force and cutting vibration, and improving the service life of the finishing milling insert.

(2) The milling cutter of the present invention includes a cutter body, which is provided with a first sipe groove, and also includes a finishing milling insert of the present invention, which is fixedly arranged in the first sipe groove. The finishing milling tool has a simple structure, and can not only ensure the quality of the finishing surface, effectively eliminate the residual steps between adjacent milling widths, but also reduce the contact length between the cutting edge and the workpiece, reduce cutting vibration, and improve the precision of the milling tool. Scope of application and service life.

Description of drawings

Fig. 1 is a perspective view of the first embodiment of the finishing milling insert of the present invention.

Fig. 2 is a top view of the first embodiment of the finishing milling insert of the present invention.

Fig. 3 is a schematic perspective view of the second embodiment of the finishing milling insert of the present invention.

Fig. 4 is a front view of a second embodiment of the finishing milling insert of the present invention.

Fig. 5 is a top view of a second embodiment of the finishing milling insert of the present invention.

Fig. 6 is a schematic perspective view of the three-dimensional structure of the milling tool of the present invention.

Fig. 7 is a front view of the milling tool of the present invention.

Each label in the figure means:

1. Blade body; 2. Upper surface; 3. Lower surface; 4. Side; 5. Cutting edge; 51. Arched cutting edge; 511. High convex point; 512. End point; 6. Mounting hole; 7. Tool body ; 71, the first sipe; 72, the second sipe; 8, the first fastener; 9, the blade adjustment mechanism; 11, the main milling blade.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Figure 1 and Figure 2 show the first embodiment of the finishing milling insert of the present invention, the finishing milling insert comprises a polygonal plate-shaped blade body 1, the blade body 1 includes an upper surface 2, a lower surface 3 and a connecting upper surface A plurality of side surfaces 4 of the surface 2 and the lower surface 3, the side surfaces 4 intersect with the upper surface 2 to form a plurality of cutting edges 5, at least one arched cutting edge 51 is provided in the plurality of cutting edges 5, and the height on the arched cutting edge 51 The convex point 511 is located between the two end points 512 of the arched cutting edge 51, and the distance H between at least one end point 512 of the arched cutting edge 51 and the high convex point 511 along the circumferential direction of the arched cutting edge 51 is not less than 0.05mm, In this embodiment, the distance H between the high convex point 511 and the right end point 512 of the arched cutting edge 51 along the circumferential direction of the arched cutting edge 51 is equal to 0.07 mm, and the radius of curvature at the high convex point 511 is R, and should Satisfy: 200mm≤R≤1500mm, the radius of curvature R at the high bump 511 must be set within the above reasonable range, in order to achieve the purpose of eliminating the residual steps between adjacent milling widths, in this embodiment, R is equal to 800mm, The finishing milling insert in this embodiment can not only ensure the quality of the processed surface, effectively eliminate the residual steps between adjacent milling widths, but also reduce the contact length between the arched cutting edge 51 and the workpiece when performing surface finishing. Thereby reducing cutting forces and cutting vibrations and increasing the service life of finishing milling inserts.

The radius of curvature at at least one end point 512 is r, and 30mm≤r≤150mm, r needs to be set within a reasonable range to ensure the cutting effect. In this embodiment, the radius of curvature at the right end point 512 of the arched cutting edge 51 Set to 80mm.

In this embodiment, the arched cutting edge 51 is a smooth curve with a continuously changing radius of curvature, and the radius of curvature in the middle of the arched cutting edge 51 is greater than the radius of curvature at both ends, that is, the middle position of the arched cutting edge 51 has the largest Radius of curvature to ensure the best finishing effect.

In this embodiment, the arched cutting edge 51 is an elliptical arc.

In this embodiment, a mounting hole 6 is provided on the blade body 1 to facilitate the installation of the finishing milling blade on the milling tool. The blade body 1 is designed as a structure without mounting holes.

Figures 3 to 5 show a second embodiment of the finishing milling insert of the present invention, the difference between this embodiment and the first embodiment is only that the arched cutting edge 51 has two different lengths and the radii are R respectively A smooth curve composed of arcs of r and r, except for this embodiment, the arched cutting edge 51 can also be a smooth curve composed of more than three arcs with different radii and different lengths.

Fig. 6 and Fig. 7 have shown a kind of embodiment of milling cutter of the present invention, and this milling cutter comprises cutter body 7, offers first sipe 71 on cutter body 7, also comprises above-mentioned finishing milling insert, and finish machining The blade body 1 of the milling insert is fixedly arranged in the first slit 71. The milling cutter in this embodiment is provided with the finishing milling insert in the above embodiment, and can ensure the quality of the finishing surface and effectively eliminate the gap between adjacent milling widths. The remaining steps between the cutting edges can also reduce the contact length between the cutting edge 5 and the workpiece, reduce cutting vibration, and improve the applicable range and service life of the milling tool.

In this embodiment, two first sipes 71 are provided on the cutter body 7, and two finishing milling inserts with different parameters are respectively fixed in the two first sipes 71, so as to meet higher surface finishing requirements. In addition to this embodiment, according to actual application requirements, a plurality of first sipes 71 and finishing milling inserts with different parameters can also be provided on the cutter body 7 .

In this embodiment, the milling tool further includes a first fastener 8 , and the first fastener 8 fixes the insert body 1 in the first groove 71 .

In this embodiment, a second sipe 72 is also provided on the cutter body 7, and the milling tool also includes a main milling blade 11, which is fixedly arranged in the second sipe 72. The blade 11 and the finishing milling blade can complete the rough machining and finishing machining of the workpiece by one cutting, which improves the milling efficiency of the milling tool.

The cutting depth of the arched cutting edge 51 is H1, and the corresponding cutting depth of the main milling insert 11 and the arched cutting edge 51 is H2. In order for the arched cutting edge 51 to cut effectively and achieve its finishing effect, it should meet: 0.02mm≤ H1-H2≤0.15mm, in this embodiment, H1-H2 is equal to 0.05mm.

In this embodiment, a blade adjustment mechanism 9 is provided in the first sipe 71 , and the cutting depth H1 of the blade body 1 can be adjusted through the blade adjustment mechanism 9 .

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person familiar with the art, without departing from the scope of the technical solution of the present invention, can use the technical content disclosed above to make many possible changes and modifications to the technical solution of the present invention, or modify it into an equivalent implementation of equivalent changes example. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention. the

Claims (11)

1. a fine finishining milling cutting insert, comprise the tabular blade body of polygon (1), described blade body (1) comprises upper surface (2), lower surface (3) and connect described upper surface (2) and multiple sides (4) of lower surface (3), described side (4) the multiple cutting edges of formation crossing with described upper surface (2) (5), it is characterized in that: in described cutting edge (5), be at least provided with an arch cutting edge (51), high salient point (511) on described arch cutting edge (51) is positioned between two end points (512) of described arch cutting edge (51), in described arch cutting edge (51), between at least one end points (512) and described high salient point (511), be not less than 0.05mm along the circumferential distance H of described arch cutting edge (51), the radius of curvature that described high salient point (511) is located is R, and 200mm≤R≤1500mm.

2. fine finishining milling cutting insert according to claim 1, is characterized in that: the radius of curvature that end points described at least one (512) is located is r, and 30mm≤r≤150mm.

3. fine finishining milling cutting insert according to claim 2, is characterized in that: described arch cutting edge (51) is radius of curvature continually varying smoothed curve, and the radius of curvature at the middle part of described arch cutting edge (51) is greater than the radius of curvature at both ends.

4. fine finishining milling cutting insert according to claim 3, is characterized in that: described arch cutting edge (51) is oval camber line.

5. fine finishining milling cutting insert according to claim 3, is characterized in that: described arch cutting edge (51) is the smoothed curve of the circular arc composition that more than two radius difference, length are different.

6. according to fine finishining milling cutting insert described described in any one in claim 1 to 5, it is characterized in that: in described blade body (1), offer installing hole (6).

7. a milling cutter, comprise cutter hub (7), on described cutter hub (7), offer the first cutter groove (71), it is characterized in that: also comprise the fine finishining milling cutting insert described in any one in claim 1 to 6, described blade body (1) is fixedly installed in described the first cutter groove (71).

8. milling cutter according to claim 7, is characterized in that: described milling cutter also comprises the first securing member (8), and described the first securing member (8) is fixed on described blade body (1) in described the first cutter groove (71).

9. according to the milling cutter described in claim 7 or 8, it is characterized in that: on described cutter hub (7), also offer the second cutter groove (72), described milling cutter also comprises main milling cutting insert (11), and described main milling cutting insert (11) is fixedly installed in described the second cutter groove (72).

10. milling cutter according to claim 9, it is characterized in that: the cutting depth of described arch cutting edge (51) is H1, the cutting depth that described main milling cutting insert (11) is corresponding with described arch cutting edge (51) is H2, and 0.02mm≤H1-H2≤0.15mm.

11. milling cutters according to claim 10, is characterized in that: in described the first cutter groove (71), be provided with blade guiding mechanism (9), can adjust by described blade guiding mechanism (9) the cutting depth H1 of described blade body (1).