Double-sided multi-edge chamfering tool

Abstract

The utility model discloses a double -sided multi -blade positive and negative chamfering tool, including the cutter head and with the blade main body of cutter head cooperation installation, the blade main body includes cutting edge, side locating surface, bottom locating surface and clearance surface, bottom locating surface and side locating surface each other vertical form locating reference, the clearance surface is along the side of blade main body and sets up, the screw hole of blade main body center is equipped with the penetration of blade main body, the cutter head is equipped with with the bottom locating surface of blade main body, side locating surface adaptation's installation slot, with the installation hole of screw hole corresponds, is used for through screw with cutter head and cutter fixed connection of blade main body. The bottom locating surface of above -mentioned indicates the plane of screw hole penetration, and side locating surface indicates the plane of being located at the side of blade main body periphery. The utility model reduces the replacement frequency of blade to reduce the use cost, and the economy is high.

Description

Technical Field

[0001] This utility model belongs to the field of cutting tool design technology, and in particular, relates to a double-sided multi-bladed positive and negative chamfering tool. Background Technology

[0002] In the field of precision machining, chamfering tools are frequently used to chamfer products. Currently, chamfering tools are relatively limited in type, typically only one side is used for chamfering, limiting their application to the front. If chamfering the reverse side is required, additional steps or flipping the tool are necessary, resulting in cumbersome processes that reduce machining efficiency and even affect quality. Currently, most indexable chamfering inserts on the market are single- or double-sided, with two, three, or four cutting edges. This results in fewer cutting edges, relatively slower cutting speeds, longer machining times, and reduced cutting efficiency. Furthermore, single- or two-edge chamfering inserts wear out quickly, requiring frequent replacements and resulting in a relatively short insert lifespan.

[0003] Patent application CN109414770A discloses a rotary milling cutter (20) for front and rear chamfering, comprising a cutter body (22) having a cutting edge groove (30) and a star-shaped indexable cutting insert (32) detachably held in the groove (30). The cutting insert (32) has a star-shaped upper surface and lower surface (42, 44), which are connected by an outer peripheral surface (46) intersecting the upper surface and lower surface (42, 44) respectively. The cutting insert (32) includes a plurality of inner corner portions and outer corner portions (50, 52) alternating in the circumferential direction. The cutting portion (54) is defined by each outer corner portion (50) together with its first inner corner portion (52a) adjacent upward before rotation and its second inner corner portion (52b) adjacent upward after rotation. Each cutting section (54) includes a front chamfered cutting edge (58a) extending from the outer corner (50) to the first inner corner (52a) and a rear chamfered cutting edge (58b) extending from the outer corner (50) to the second inner corner (52b). This patented rotary milling cutter has only one effective cutting section (located radially outside the outer circumferential surface of the shank), with the rest being ineffective cutting sections. During machining, only one cutting section participates in the operation, resulting in a limited cutting volume per unit time. Especially in batch machining scenarios, its efficiency is far lower than that of tools with multiple effective cutting sections. Utility Model Content

[0004] This invention addresses the common problem in existing indexable chamfering inserts, which are mostly single-sided or double-sided with two, three, or four cutting edges. This results in fewer cutting edges, relatively slower cutting speeds, longer machining times, and reduced cutting efficiency. Furthermore, single- or double-edge chamfering inserts wear out quickly, requiring frequent replacements and having a relatively short lifespan. Therefore, this invention proposes a double-sided, multi-edge, positive and negative chamfering tool.

[0005] A double-sided, multi-edged, positive and negative chamfering tool includes a cutter head and a blade body that mates with the cutter head. The blade body includes a cutting edge, a side positioning surface, a bottom positioning surface, and a clearance surface. The bottom positioning surface and the side positioning surface are perpendicular to each other, forming a positioning reference. The clearance surface and the side positioning surface are arranged along the side edge of the blade body. A screw hole penetrating the blade body is provided at the center of the blade body. The cutter head has mounting grooves adapted to the bottom positioning surface and the side positioning surface of the blade body, as well as mounting holes corresponding to the screw hole, for fixing the blade body to the cutter head with screws. The bottom positioning surface refers to the plane through which the screw hole passes, and the side positioning surface refers to the plane located on the four sides of the blade body.

[0006] Furthermore, the blade body has a rhomboid structure.

[0007] Furthermore, the cutting edges are evenly distributed along the circumference of the blade body, the included angle between adjacent cutting edges is an acute angle, and adjacent cutting edges are connected by a circular arc.

[0008] Furthermore, the blade body is provided with sixteen cutting edges, and the included angle between adjacent cutting edges can be set to 60°, 45°, 30° or 10°.

[0009] Furthermore, the blade body is made of cemented carbide, and the surface of the blade body is provided with a wear-resistant coating.

[0010] Furthermore, the screw hole has a stepped surface in the radial direction, and the width of the stepped surface is 0.5 to 1.5 mm.

[0011] Furthermore, the mounting groove of the cutter head is provided with a support surface, a limiting surface, and a clearance groove. The support surface is in contact with the bottom positioning surface of the blade, the limiting surface is in contact with the side positioning surface of the blade, and the clearance groove is used to accommodate two adjacent clearance surfaces on the blade body.

[0012] Furthermore, the contour of the mounting groove matches the outer contour of the blade body, and the fitting clearance between the blade body and the mounting groove is ≤0.1mm.

[0013] Furthermore, the number of mounting slots is adapted to the blade body, and at least four chamfered blades can be installed on the blade disc.

[0014] Furthermore, the surface roughness of both the bottom positioning surface and the side positioning surface is no greater than Ra0.8μm.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] 1. This utility model includes a cutter head and a blade body that is installed in conjunction with the cutter head. The blade body includes a cutting edge, a side positioning surface, a bottom positioning surface, and a clearance surface. The bottom positioning surface and the side positioning surface are perpendicular to each other to form a positioning reference. The clearance surface and the side positioning surface are arranged along the side of the blade body. A screw hole penetrating the blade body is provided at the center of the blade body. The cutter head has mounting grooves adapted to the bottom positioning surface and the side positioning surface of the blade body, as well as mounting holes corresponding to the screw holes, for fixing the blade body to the cutter head with screws. The blade of this utility model has a double-sided 16-edge structure, which has more cutting edges and can remain usable even after multiple changes in cutting position, greatly extending the overall service life of the blade, reducing the frequency of blade replacement, thereby reducing the user's operating costs and having better economic efficiency.

[0017] 2. The blade of this utility model is provided with a bottom positioning surface, a side positioning surface, and a clearance surface. The cutter head has a groove adapted to the blade. The bottom support surface and side support surface in the groove mate with the bottom positioning surface and side positioning surface of the blade, respectively. The blade is then fixedly connected to the cutter head by screws passing through screw holes. This ensures the stability and positioning accuracy of the blade on the cutter head, guaranteeing a smooth cutting process. Simultaneously, the clearance surface prevents interference between the blade and unnecessary parts of the workpiece or cutter head during cutting, improving the safety and reliability of the cutting process. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a top view of the present invention;

[0020] Figure 3 This is a schematic diagram showing the installation of the chamfering blade and the cutter head of this utility model;

[0021] Figure 4 This is a schematic diagram of the cutter head structure of this utility model;

[0022] Figure 5 This is a bottom view of the chamfering blade and cutter head of this utility model.

[0023] In the above figure, 1. Blade body; 2. Cutter head; 3. Cutting edge; 4. Bottom positioning surface; 5. Side positioning surface; 6. Clearance surface; 7. Screw hole; 8. Mounting groove; 9. Mounting hole; 10. Support surface; 11. Limiting surface; 12. Clearance groove. Detailed Implementation

[0024] To clearly illustrate the technical features of this utility model, the following detailed description is provided through specific embodiments and in conjunction with the accompanying drawings.

[0025] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0026] Furthermore, in the description of this utility model, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0027] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. In this utility model, unless otherwise explicitly specified and limited, "on" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact through an intermediate medium.

[0028] Example 1

[0029] like Figure 1 As shown, a double-sided multi-edged chamfering tool includes a cutter head 2 and a blade body 1 that is fitted to the cutter head 2. The blade body 1 includes a cutting edge 3, a side positioning surface 5, a bottom positioning surface 4, and a clearance surface 6. The bottom positioning surface 4 and the side positioning surface 5 are perpendicular to each other to form a positioning reference. The clearance surface 6 and the side positioning surface 5 are arranged along the side of the blade body 1. A screw hole 7 penetrating the blade body 1 is provided at the center of the blade body 1. The cutter head 2 is provided with a mounting groove 8 that matches the bottom positioning surface 4 and the side positioning surface 5 of the blade body 1, and a mounting hole 9 corresponding to the screw hole 7, for fixing the blade body 1 to the cutter head 2 with screws.

[0030] In this embodiment, a double-sided multi-blade positive and negative chamfering tool suitable for 45° chamfering of metal sheets is disclosed.

[0031] Specifically, such as Figures 1 to 5 As shown, the chamfering tool includes a circular cutter head 2 and four rhomboid insert bodies 1 that mate with the cutter head 2. The insert bodies 1 are made of WC-Co cemented carbide and coated with a TiAlN wear-resistant coating to improve the cutting wear resistance of the inserts. The insert bodies 1 have a total of 16 cutting edges on both sides, evenly distributed along the circumferential edge. The included angle between adjacent cutting edges 3 is 45°, and adjacent cutting edges 3 are smoothly transitioned by an arc with a radius of R0.5mm to avoid stress concentration during cutting.

[0032] The bottom locating surface 4 and the side locating surface 5 of the insert body 1 are perpendicular to each other, and both have a surface roughness of Ra0.6μm to ensure the positioning accuracy of the insert. The side locating surface 5 and the clearance surface 6 are alternately arranged along the side. The clearance surface 6 is recessed 1.2mm inward towards the insert to avoid interference with the workpiece edge during cutting. The screw hole 7 in the center of the insert passes through the center of the two bottom locating surfaces 4. The interior has a stepped surface with a width of 1.0mm in the radial direction to accommodate M5 hex socket screws. The insert body 1 and the cutter head 2 are fixedly installed by the screws.

[0033] like Figures 3 to 5 As shown, the cutter head 2 has four mounting slots 8. The outline of the mounting slots 8 perfectly matches the outer outline of the blade body 1, and the clearance between the blade body 1 and the mounting slots 8 is controlled within 0.08mm to ensure that the blade is installed securely. The support surface 10 inside the mounting slot 8 fits against the bottom positioning surface 4 of the blade, the limiting surface 11 is in close contact with the side positioning surface 5, and the outer side of the mounting slot 8 is provided with a clearance groove 12 to accommodate two adjacent clearance surfaces 6 of the blade. The blade is rigidly fixed to the cutter head 2 by screwing through the blade screw hole 7 and screwing it into the mounting hole 9 of the cutter head 2.

[0034] In this embodiment, the double-sided 16-flute design of the cutting tool in the chamfering of stainless steel sheet significantly improves the service life of the cutting tool.

[0035] Example 2

[0036] like Figure 1As shown, a double-sided multi-edged chamfering tool includes a cutter head 2 and a blade body 1 that is fitted to the cutter head 2. The blade body 1 includes a cutting edge 3, a side positioning surface 5, a bottom positioning surface 4, and a clearance surface 6. The bottom positioning surface 4 and the side positioning surface 5 are perpendicular to each other to form a positioning reference. The clearance surface 6 and the side positioning surface 5 are arranged along the side of the blade body 1. A screw hole 7 penetrating the blade body 1 is provided at the center of the blade body 1. The cutter head 2 is provided with a mounting groove 8 that matches the bottom positioning surface 4 and the side positioning surface 5 of the blade body 1, and a mounting hole 9 corresponding to the screw hole 7, for fixing the blade body 1 to the cutter head 2 with screws.

[0037] This embodiment discloses a double-sided multi-bladed positive and negative chamfering tool suitable for 30° chamfering of precision parts.

[0038] The cutting tool includes a cutter head 2 and a rhomboid insert body 1. The insert body 1 is made of ultra-fine grain cemented carbide (grain size 0.8μm) and coated with an AlCrN+TiN composite coating, suitable for high-speed cutting. The insert body 1 has 16 cutting edges 3 evenly distributed along its circumferential edge, with adjacent cutting edges 3 forming a 30° angle, connected by a 0.3mm radius arc to accommodate small-diameter chamfering requirements. The perpendicularity error between the bottom locating surface 4 and the side locating surface 5 of the insert is ≤0.01mm / m, and the surface roughness is Ra0.4μm. The step width inside the screw hole 7 is 0.8mm, suitable for M4 countersunk screws, preventing the screw head from protruding and affecting cutting. The mounting groove 8 on the cutter head 2 has a 0.05mm clearance with the insert body 1, and the support surface 10 within the mounting groove 8 is hardened to improve wear resistance.

[0039] Example 3

[0040] like Figure 1 As shown, a double-sided multi-edged chamfering tool includes a cutter head 2 and a blade body 1 that is fitted to the cutter head 2. The blade body 1 includes a cutting edge 3, a side positioning surface 5, a bottom positioning surface 4, and a clearance surface 6. The bottom positioning surface 4 and the side positioning surface 5 are perpendicular to each other to form a positioning reference. The clearance surface 6 and the side positioning surface 5 are arranged along the side of the blade body 1. A screw hole 7 penetrating the blade body 1 is provided at the center of the blade body 1. The cutter head 2 is provided with a mounting groove 8 that matches the bottom positioning surface 4 and the side positioning surface 5 of the blade body 1, and a mounting hole 9 corresponding to the screw hole 7, for fixing the blade body 1 to the cutter head 2 with screws.

[0041] In this embodiment, the cutting tool includes a disc-shaped cutter head 2 and a rhomboid insert body 1. The insert body 1 is made of WC-TiC-Co cemented carbide, and its surface is coated with a multi-layer nano-composite coating with a thickness of 5μm, suitable for difficult-to-machine materials such as high-strength cast iron. The included angle between adjacent cutting edges 3 on the insert body 1 is 60°, and the cutting edges 3 are evenly distributed along the circumference of the insert, with adjacent cutting edges 3 connected by a circular arc transition.

[0042] The bottom locating surface 4 and side locating surface 5 of the cutting tool have a surface roughness of Ra0.8μm, and the inner step surface of the screw hole 7 has a width of 1.5mm, suitable for M6 high-strength screws. The mounting groove 8 on the cutter head 2 has a clearance of 0.1mm with the cutting tool, and the limiting surface of the mounting groove 8 adopts a wedge design, which further eliminates the clearance through screw preload. The mounting grooves 8 on the cutter head 2 are evenly distributed circumferentially, which can realize continuous chamfering of large castings.

[0043] Obviously, the above-described embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A double-sided, multi-edged, positive and negative chamfering tool, characterized in that, The device includes a cutter head and a blade body that is installed in conjunction with the cutter head. The blade body includes a cutting edge, a side positioning surface, a bottom positioning surface, and a clearance surface. The bottom positioning surface and the side positioning surface are perpendicular to each other to form a positioning reference. The clearance surface and the side positioning surface are arranged along the side of the blade body. A screw hole penetrating the blade body is provided at the center of the blade body. The cutter head is provided with mounting grooves that are adapted to the bottom positioning surface and the side positioning surface of the blade body, and mounting holes corresponding to the screw holes, for fixing the blade body to the cutter head with screws.

2. The double-sided multi-bladed positive and negative chamfering tool according to claim 1, characterized in that, The blade body has a rhomboid structure.

3. A double-sided multi-bladed positive and negative chamfering tool according to claim 1, characterized in that, The cutting edges are evenly distributed along the circumference of the blade body, the included angle between adjacent cutting edges is an acute angle, and adjacent cutting edges are connected by a circular arc.

4. A double-sided multi-bladed positive and negative chamfering tool according to claim 3, characterized in that, The blade body has sixteen cutting edges, and the included angle between adjacent cutting edges can be set to 60°, 45°, 30° or 10°.

5. A double-sided multi-bladed positive and negative chamfering tool according to claim 1, characterized in that, The blade body is made of cemented carbide, and the surface of the blade body is coated with a wear-resistant coating.

6. A double-sided multi-bladed positive and negative chamfering tool according to claim 1, characterized in that, The screw hole has a stepped surface in the radial direction, and the width of the stepped surface is 0.5 to 1.5 mm.

7. A double-sided multi-bladed positive and negative chamfering tool according to claim 1, characterized in that, The mounting groove of the cutter head is provided with a support surface, a limiting surface and a clearance groove. The support surface is in contact with the bottom positioning surface of the blade, the limiting surface is in contact with the side positioning surface of the blade, and the clearance groove is used to accommodate two adjacent clearance surfaces on the blade body.

8. A double-sided multi-bladed positive and negative chamfering tool according to claim 1, characterized in that, The contour of the mounting groove matches the outer contour of the blade body, and the fitting clearance between the blade body and the mounting groove is ≤0.1mm.

9. A double-sided multi-edged positive and negative chamfering tool according to claim 8, characterized in that, The number of mounting slots is adapted to the blade body, and at least four chamfered blades can be installed on the blade disc.

10. A double-sided multi-edged positive and negative chamfering tool according to claim 1, characterized in that, The surface roughness of both the bottom positioning surface and the side positioning surface is no greater than Ra0.8μm.

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