CN111085715A

CN111085715A - PCD milling cutter

Info

Publication number: CN111085715A
Application number: CN202010007493.7A
Authority: CN
Inventors: 杨志泉
Original assignee: Dongguan Mile Metal Products Co ltd
Current assignee: Dongguan Mile Metal Products Co ltd
Priority date: 2020-01-04
Filing date: 2020-01-04
Publication date: 2020-05-01

Abstract

The invention relates to the technical field of milling cutter superhard cutters, in particular to a PCD milling cutter, which comprises a cutter bar and a PCD cutter head; the PCD cutter head is provided with a cutting section and a connecting section which are sequentially connected, and the cutting section is provided with a plurality of helical blades which are sequentially arranged at intervals along the circumferential direction; the end face of one end of the connecting section, which is far away from the cutting section, is a welding face; the welding surface of the connecting section is welded on the end face of one end of the cutter bar, and the center line of the cutter bar is overlapped with the center line of the PCD cutter head. Compared with the prior art, the processing quantity of the spiral cutting edges on the PCD milling cutter can be greatly increased, so that the sharpness of the PCD milling cutter can be improved; in addition, the cutter bar and the cutter head can be smoothly transited at the joint after being welded, so that the appearance is more attractive.

Description

PCD milling cutter

Technical Field

The invention relates to the technical field of milling cutter superhard cutters, in particular to a PCD milling cutter.

Background

Polycrystalline diamond (PCD) cutters have the advantages of high hardness, wear resistance, low friction coefficient, high thermal conductivity and the like of diamond, and therefore, the PCD cutters are widely applied to the field of processing nonferrous metals and non-metallic materials difficult to process.

The conventional PCD milling cutter generally comprises a cutter body and a milling blade, wherein the cutter body is made of hard alloy or steel, a milling cutter groove is formed in the side surface of the front end of the cutter body, the milling blade is welded in the milling cutter groove, and each milling blade is provided with a cutting edge. The number of the milling cutter blades can be one or more, and generally, the larger the number of the milling cutter blades is, the larger the number of the edges of the PCD milling cutter is, and the better the machining performance of the PCD milling cutter on a product is.

However, due to the structural limitation of the existing PCD milling cutter, too many milling cutter grooves cannot be machined on the side surface of the front end of the cutter body of the PCD milling cutter, otherwise the strength of the cutter body is greatly influenced. The number of milling blades on the existing PCD milling cutter is generally less than 8, namely the number of edges of the PCD milling cutter is less than 8. Therefore, how to increase the blade count of the PCD cutter to improve the sharpness of the PCD cutter has become a problem recognized by those skilled in the art.

Disclosure of Invention

In view of this, the present invention provides a PCD milling cutter, which mainly aims to solve the technical problem that the PCD milling cutter is not sharp enough due to the small number of cutting edges of the PCD milling cutter limited by the structure of the existing PCD milling cutter.

In order to achieve the purpose, the invention mainly provides the following technical scheme:

the embodiment of the invention provides a PCD milling cutter, which comprises a cutter bar and a PCD cutter head; the PCD cutter head is provided with a cutting section and a connecting section which are sequentially connected, and the cutting section is provided with a plurality of helical blades which are sequentially arranged at intervals along the circumferential direction; the end face of one end of the connecting section, which is far away from the cutting section, is a welding face; the welding surface of the connecting section is welded on the end face of one end of the cutter bar, and the center line of the cutter bar is overlapped with the center line of the PCD cutter head.

By adopting the technical scheme, the milling cutter blade does not need to be welded, the whole PCD cutter head is welded on the cutter bar in an end-to-end mode, and then the spiral cutting edge is machined on the PCD cutter head along the circumferential direction.

The invention is further configured to: the end face of the one end of the cutter bar is consistent with the outline shape of the welding face.

By adopting the technical scheme, the cutter bar and the cutter head can be smoothly transited at the joint after being welded, and the appearance is more attractive.

The invention is further configured to: an annular groove is formed in the cutting section; the annular groove is provided with a first side surface, a bottom surface and a second side surface which are sequentially connected; the second side face is close to the connecting section relative to the first side face; each helical cutting edge extends from an end of the cutting segment facing away from the connecting segment along the first side surface to the second side surface through the bottom surface.

Through adopting above-mentioned technical scheme, the annular groove has the characteristics of strengthening the groove, can improve the structural strength of cutting section.

The invention is further configured to: the first side surface and the second side surface are inclined surfaces which are relatively opened.

Through adopting above-mentioned technical scheme, have the advantage of conveniently processing first side and second side.

The invention is further configured to: the number of the spiral blades is more than or equal to 24 blades.

By adopting the technical scheme, the number of the spiral cutting edges is far higher than that of the PCD milling cutter in the prior art, so that the sharpness of the PCD milling cutter 100 is greatly improved.

The invention is further configured to: the surface roughness Ra of the cutting section is less than or equal to 150 nanometers.

By adopting the technical scheme, the surface roughness of the cutting section 21 is limited below 150 nanometers, so that the surface roughness of the PCD cutter head 2 is not too large to influence the sharpness.

By means of the technical scheme, the PCD milling cutter at least has the following beneficial effects:

1. compared with the prior art, the processing quantity of the spiral cutting edges on the PCD milling cutter can be greatly increased, so that the sharpness of the PCD milling cutter can be improved;

2. after the cutter bar and the cutter head are welded, the smooth transition can be realized at the joint, and the appearance is more attractive.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.

Drawings

FIG. 1 is a schematic structural view of a PCD milling cutter provided in accordance with an embodiment of the present invention;

FIG. 2 is an exploded view of the PCD milling cutter of FIG. 1;

FIG. 3 is a schematic structural view of a PCD bit of the PCD milling cutter of FIG. 1;

fig. 4 is a schematic structural diagram of another PCD milling cutter according to an embodiment of the present invention.

Reference numerals: 1. a cutter bar; 2. a PCD cutter head; 20. welding a surface; 21. a cutting section; 22. a connecting section; 23. an annular groove; 24. a helical cutting edge; 231. a first side surface; 232. a bottom surface; 233. a second side surface; 100. PCD milling cutter.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship, motion situation, etc. between the segments in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly. In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.

As shown in fig. 1 to 3, a PCD milling cutter 100 according to an embodiment of the present invention includes a cutter holder 1 and a PCD tip 2. The blade holder 1 may be made of a steel bar. The PCD tip 2 is made entirely of PCD material. The PCD tip 2 has a cutting section 21 and a connecting section 22 connected in series. The cutting segment 21 has a plurality of helical cutting edges 24 arranged in a circumferentially spaced-apart sequence. The end face of the connecting section 22 facing away from the end of the cutting section 21 is a welding face 20. The welding surface 20 of the connecting section 22 is welded to the end surface of one end of the tool holder 1, and the center line of the tool holder 1 coincides with the center line of the PCD tip 2. Preferably, both the tool holder 1 and the PCD tip 2 may be cylindrical-like in shape.

Compared with the prior art that the milling cutter blade is welded in a mode of slotting the front end side face of the cutter bar 1, the technical scheme of the invention does not need to weld the milling cutter blade, but the whole section of PCD cutter head 2 is welded on the cutter bar 1 in an end-to-end mode, and then the spiral cutting edge 24 is machined on the PCD cutter head 2 along the circumferential direction, so that the machining number of the spiral cutting edge 24 can be greatly increased due to no limitation of slotting, and the sharpness of the PCD milling cutter 100 is improved.

As shown in fig. 4, an embodiment of the present invention also provides another PCD milling cutter, which has a different tool shank shape compared to the PCD milling cutter of fig. 1.

Further, as shown in fig. 1 to 3, the end surface of one end of the tool bar 1 and the welding surface 20 have the same contour shape, for example, both may be square or circular, so that the tool bar 1 and the tool bit may smoothly transition at the joint after welding, and the appearance is more beautiful.

Preferably, the end face of one end of the tool bar 1 and the welding face 20 are both circular in outline shape, so that the force applied to the two parts after butt joint is more uniform.

Further, as shown in fig. 3, the cutting segment 21 may be provided with a circumferentially extending annular groove 23. The annular groove 23 has a first side 231, a bottom 232 and a second side 233 connected in series. The second side 233 is adjacent to the connecting section 22 opposite the first side 231. Each helical cutting edge 24 extends from an end of the cutting segment 21 facing away from the connecting segment 22 along the first side 231 through the bottom 232 to the second side 233.

Further, as shown in fig. 3, the first side 231 and the second side 233 are inclined surfaces that are relatively opened.

In a specific application example, the number of the spiral cutting edges 24 is more than or equal to 24 edges, which is far higher than the number of the cutting edges of the PCD milling cutter in the prior art, so that the sharpness of the PCD milling cutter 100 of the invention is greatly improved.

Further, the surface roughness Ra of the aforementioned cutting segment 21 is 150 nm or less. In this example, by limiting the surface roughness of the cutting segment 21 to 150 nm or less, the surface roughness of the PCD tip 2 is not so great as to affect its sharpness.

The working principle and preferred embodiments of the present invention are described below.

The invention designs a PCD milling cutter 100 with a brand-new structural form, and abandons the structural form of welding milling blades of the traditional PCD milling cutter. Specifically, the PCD milling cutter 100 of the present invention is manufactured by welding a whole segment of the PCD tip 2 to the cutter holder 1 in an end-to-end manner, and then machining the helical cutting edge 24 on the PCD tip 2 in a circumferential direction. The surface roughness Ra of the PCD cutter head 2 is less than or equal to 150 nanometers, and the appearance effect after processing is free of grinding wheel lines and knife marks, so that the PCD milling cutter 100 can process more than or equal to four thousand pieces of workpieces, and the service life is long. The PCD cutter head 2 of the PCD milling cutter 100 of the invention is made of PCD material, the spiral blades 24 on the PCD cutter head 2 are polished, and the number of the spiral blades 24 is more than or equal to 24 blades. Wherein. The edge cutting mode, the spiral angle, the spiral direction, the cutting edge angle, the cutting edge depth, the cutting edge number and the like of the cutting edge can be adjusted according to actual needs.

Here, it should be noted that: in the case of no conflict, a person skilled in the art may combine the related technical features in the above examples according to actual situations to achieve corresponding technical effects, and details of various combining situations are not described herein.

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.

Claims

1. A PCD milling cutter, which is characterized by comprising a cutter bar (1) and a PCD cutter head (2);

the PCD cutter head (2) is provided with a cutting section (21) and a connecting section (22) which are sequentially connected, and the cutting section (21) is provided with a plurality of helical blades (24) which are sequentially arranged at intervals along the circumferential direction;

the end face of one end of the connecting section (22) departing from the cutting section (21) is a welding face (20);

the welding surface (20) of the connecting section (22) is welded on the end surface of one end of the cutter bar (1), and the center line of the cutter bar (1) is superposed with the center line of the PCD cutter head (2).

2. The PCD milling cutter according to claim 1,

the end face of the one end of the cutter bar (1) is consistent with the outline shape of the welding face (20).

3. The PCD milling cutter according to claim 1 or 2,

an annular groove (23) extending along the circumferential direction is formed in the cutting section (21); the annular groove (23) is provided with a first side surface (231), a bottom surface (232) and a second side surface (233) which are connected in sequence; the second side (233) being adjacent to the connecting section (22) relative to the first side (231);

each helical cutting edge (24) extends from an end of the cutting section (21) facing away from the connecting section (22) along a first side surface (231) to the second side surface (233) via the base surface (232).

4. The PCD milling cutter according to claim 3,

the first side surface (231) and the second side surface (233) are both relatively flared inclined surfaces.

5. A PCD milling cutter according to claim 1, 2 or 4,

the number of the spiral blades (24) is more than or equal to 24 blades.

6. A PCD milling cutter according to claim 1, 2 or 4,

the surface roughness Ra of the cutting section (21) is less than or equal to 150 nm.