Round nose knife

Abstract

The utility model discloses a round nose cutter which is provided with a cutting end, the cutting end is provided with a plurality of end edges, the plurality of end edges are circumferentially arranged around the axis of the round nose cutter, a chip pocket is formed between any two adjacent end edges, and the front cutter faces of the end edges form part of the groove wall of the chip pocket; a plurality of chip grooves are formed in the circumferential face of the round nose cutter, the chip grooves correspond to the chip containing grooves in a one-to-one mode and communicate with the chip containing grooves, and chip breaking grooves are formed in the junctions of the front cutter faces of the end edges and the chip grooves. According to the round nose knife, a plurality of chip grooves are formed in the circumferential face of the round nose knife, a chip containing groove is formed between any two adjacent end edges, the chip grooves and the chip containing grooves are in one-to-one correspondence and are communicated, and chip breaking grooves are formed in the junctions of the front knife faces of the end edges and the chip grooves; according to the round nose cutter, the chip breaker grooves are formed, so that cutting chips generated when the parts, close to the chip breaker grooves, of the end edges cut workpieces can directly enter the chip discharging grooves from the chip breaker grooves, damage of the cutting chips to the groove walls of the chip containing grooves is reduced, and the service life of the round nose cutter is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of metal milling, and particularly relates to a round nose cutter. Background Art

[0002] A round nose cutter is a cutting tool.

[0003] In the related art, chip flutes are formed between the respective end edges of the round nose cutter, and chip evacuation grooves communicating with the chip flutes are provided on the circumferential side of the round nose cutter. During the cutting of a workpiece by the round nose cutter, the generated cutting chips can be discharged successively through the chip flutes and the chip evacuation grooves.

[0004] However, after the cutting chips enter the chip evacuation grooves, they will cause great extrusion on the groove walls of the chip evacuation grooves, thereby damaging the groove walls of the chip evacuation grooves, and further reducing the service life of the round nose cutter. Summary of the Utility Model

[0005] The purpose of the utility model is to solve at least one of the technical problems existing in the prior art. The utility model provides a round nose cutter with a longer service life.

[0006] According to the round nose cutter provided by the embodiment of the utility model, the round nose cutter is provided with a cutting end, and a plurality of end edges are arranged on the cutting end. The plurality of end edges are arranged circumferentially around the axis of the round nose cutter. Chip flutes are formed between any two adjacent end edges, and a part of the groove wall of the chip flutes is formed by the rake face of the end edge; a plurality of chip evacuation grooves are formed on the circumferential surface of the round nose cutter. The chip evacuation grooves correspond to and communicate with the chip flutes one by one, and a chip breaking groove is provided at the junction of the rake face of the end edge and the chip evacuation groove.

[0007] The round nose cutter described in the utility model has at least the following beneficial effects: In the round nose cutter of the present application, a plurality of chip evacuation grooves are formed on the circumferential surface of the round nose cutter. Chip flutes are formed between any two adjacent end edges. The chip evacuation grooves correspond to and communicate with the chip flutes one by one, and a chip breaking groove is provided at the junction of the rake face of the end edge and the chip evacuation groove; the provision of the chip breaking groove enables the cutting chips generated by the end edge near the chip breaking groove to cut the workpiece to directly enter the chip evacuation groove from the chip breaking groove, reducing the damage to the groove wall of the chip flutes by the cutting chips, and further improving the service life of the round nose cutter of the present application.

[0008] According to the round nose cutter described in the embodiment of the utility model, the round nose cutter includes a tool shank portion, a tool neck portion and a cutting edge portion. The opposite ends of the tool neck portion are smoothly connected to the tool shank portion and the cutting edge portion respectively. One end of the cutting edge portion away from the tool neck portion forms a cutting end. Along the direction close to the cutting edge portion, the cross-sectional dimension of the tool neck portion gradually decreases, and the chip evacuation grooves extend through the cutting edge portion and the tool neck portion in sequence to the tool shank portion.

[0009] According to the round nose cutter described in the embodiments of the present utility model, a peripheral edge is formed between any two adjacent chip flutes. The peripheral edge has a peripheral edge rake angle, a first peripheral edge clearance angle, and a second peripheral edge clearance angle. The angle a1 of the peripheral edge rake angle satisfies: 2° ≤ a1 ≤ 10°. The angle a2 of the first peripheral edge clearance angle satisfies: 4° ≤ a2 ≤ 8°. The angle a3 of the second peripheral edge clearance angle satisfies: 15° ≤ a3 ≤ 20°.

[0010] According to the round nose cutter described in the embodiments of the present utility model, the peripheral edge has a peripheral edge flank. The peripheral edge flank includes a first section and a second section that are smoothly connected. The first section is a plane, and a first peripheral edge clearance angle is formed between the first section and the cutting plane of the peripheral edge. The second section is an arc surface, and a second peripheral edge clearance angle is formed between the second section and the cutting plane of the peripheral edge.

[0011] According to the round nose cutter described in the embodiments of the present utility model, the width l1 of the first section satisfies: 0.08 mm ≤ l1 ≤ 0.15 mm.

[0012] According to the round nose cutter described in the embodiments of the present utility model, the diameter of the cutting edge part is D, and the core diameter of the peripheral edge is 0.6D.

[0013] According to the round nose cutter described in the embodiments of the present utility model, the helix angle α of the chip flute satisfies: 37° ≤ b ≤ 39°.

[0014] According to the round nose cutter described in the embodiments of the present utility model, the end edge has an end edge rake angle, a first end edge clearance angle, and a second end edge clearance angle. The angle b1 of the end edge rake angle satisfies: 0° ≤ b1 ≤ 6°. The angle b2 of the first end edge clearance angle satisfies: 6° ≤ b2 ≤ 12°. The angle b3 of the second end edge clearance angle satisfies: 18° ≤ b3 ≤ 26°.

[0015] According to the round nose cutter described in the embodiments of the present utility model, the diameter of the cutting end is D. The end edge has an end edge flank. The end edge flank includes a third section and a fourth section that are smoothly connected. The width l2 of the third section satisfies:

[0016] l2 = 0.1D. A first end edge clearance angle is formed between the third section and the cutting plane of the end edge. A second end edge clearance angle is formed between the fourth section and the cutting plane of the end edge.

[0017] According to the round nose cutter described in the embodiments of the present utility model, there are three end edges provided on the cutting end.

[0018] Additional aspects and advantages of the present utility model will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present utility model. Description of the Drawings

[0019] The present utility model will be further described below in conjunction with the drawings and embodiments;

[0020] Figure 1 Structural schematic diagram of a round nose cutter according to an embodiment of the present utility model;

[0021] Figure 2 For Figure 1 Partial enlarged view of the structure at position A of the round nose cutter shown;

[0022] Figure 3 For Figure 1 Structural schematic diagram of the peripheral edge of the round nose cutter shown;

[0023] Figure 4 For Figure 1 Cross-sectional view of the round nose cutter shown in the B-B direction;

[0024] Figure 5 For Figure 1 Structural schematic diagram of the end edge of the round nose cutter shown.

[0025] Reference numerals:

[0026] Tool shank part 100;

[0027] Tool neck part 200;

[0028] Cutting edge part 300; end edge 310; end edge front angle 311; first end edge back angle 312; second end edge back angle 313; end edge rake face 314; chip pocket 320; chip groove 330; chip breaker groove 340; peripheral edge 350; peripheral edge front angle 351; first peripheral edge back angle 352; second peripheral edge back angle 353. Detailed implementation manners

[0029] This part will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the drawings. The role of the drawings is to supplement the description of the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but it should not be construed as a limitation on the protection scope of the present utility model.

[0030] In the description of the present utility model, it should be understood that for the orientation description, such as the upper, lower, front, rear, left, right, etc., the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present utility model.

[0031] In the description of the present utility model, the meaning of "several" is one or more, the meaning of "multiple" is more than two, and understandings such as "greater than", "less than", and "exceeding" do not include the corresponding number, while understandings such as "above", "below", and "within" include the corresponding number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features or implicitly specifying the sequence relationship of the indicated technical features.

[0032] In the description of the present utility model, unless otherwise clearly defined, terms such as "arrangement", "installation", and "connection" should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present utility model in combination with the specific content of the technical solution.

[0033] The following refers to Figures 1 to 5 to describe the round nose cutter of the present application in detail.

[0034] Referring to Figure 1 and Figure 2 , for the round nose cutter according to an embodiment of the present utility model, a cutting end is provided on the round nose cutter, and a plurality of end edges 310 are provided on the cutting end. The plurality of end edges 310 are arranged circumferentially around the axis of the round nose cutter, and a chip pocket 320 is formed between any two adjacent end edges 310. A part of the groove wall of the chip pocket 320 is formed by the front cutting face 314 of the end edge 310; a plurality of chip discharge grooves 330 are formed on the peripheral surface of the round nose cutter, and the chip discharge grooves 330 correspond to and communicate with the chip pockets 320 one by one, and a chip breaking groove 340 is provided at the junction of the front cutting face 314 of the end edge and the chip discharge groove 330.

[0035] It should be noted that when the round nose cutter cuts a workpiece, the cutting chips generated by the end edge 310 cutting the workpiece enter the chip pocket 320 along the front cutting face 314 of the end edge 310, and then the cutting chips enter the chip discharge groove 330 from the chip pocket 320 and are discharged along the chip discharge groove 330.

[0036] It can be understood that in the round nose cutter of this embodiment, since a chip breaking groove 340 is provided at the junction of the front cutting face 314 of the end edge and the chip discharge groove 330, during the milling process of the round nose cutter of this embodiment on the workpiece, part of the cutting chips enter the chip pocket 320 along the front cutting face 314 of the end edge, and the remaining part of the cutting chips enter the chip breaking groove 340 along the front cutting face 314 of the end edge and directly enter the chip discharge groove 330 through the chip breaking groove 340, achieving the chip splitting effect of the cutting chips, thereby reducing the quantity of the cutting chips entering the chip pocket 320, and thus being able to reduce the wear caused by the cutting chips to the groove wall of the chip pocket 320 and improve the service life of the round nose cutter of this embodiment.

[0037] It can be understood that due to the setting of the chip breaker groove 340, when the whole piece of cutting chip moves along the front face 314 of the end edge, under the action of the junction of the chip pocket 320 and the chip breaker groove 340, the whole piece of cutting chip can be fractured, thus realizing the chip breaking effect of the cutting chip.

[0038] In a specific embodiment of the present utility model, the cutting end of the round nose cutter is provided with three end edges 310. Correspondingly, three chip pockets 320 are formed at the cutting end, and three chip evacuation grooves 330 are correspondingly provided on the circumferential side of the round nose cutter.

[0039] It can be understood that setting the end edge 310 of the round nose cutter to three, which is a common number, can make the round nose cutter of the present application have better general performance.

[0040] It can be understood that by setting the end edge 310 of the round nose cutter to three, three chip evacuation grooves 330 are formed on the circumferential side of the round nose cutter. The setting of the three chip evacuation grooves 330 enables the round nose cutter of the present application to ensure its chip evacuation performance while enabling the core diameter of the round nose cutter of the present application to be set larger, thereby improving the rigidity of the core diameter of the round nose cutter of the present application.

[0041] In a further embodiment of the present utility model, referring to Figure 4 , the diameter of the cutting edge part 300 is D, and the core diameter of the peripheral edge 350 is 0.6D.

[0042] In some other embodiments of the present utility model, without considering the general performance of the round nose cutter, the end edge 310 of the round nose cutter can also be set to other numbers such as two, four, five, etc.

[0043] In some embodiments of the present utility model, the round nose cutter includes a tool shank part 100, a tool neck part 200, and a cutting edge part 300. The two opposite ends of the tool neck part 200 are smoothly connected to the tool shank part 100 and the cutting edge part 300 respectively. One end of the cutting edge part 300 away from the tool neck part 200 forms a cutting end. Along the direction close to the cutting edge part 300, the cross-sectional dimension of the tool neck part 200 gradually decreases, and the chip evacuation groove 330 extends through the cutting edge part 300 and the tool neck part 200 to the tool shank part 100 in sequence.

[0044] For example, as Figure 1As shown, the round nose knife extends in the front-to-back direction. In the front-to-back direction, the round nose knife includes a handle portion 100, a neck portion 200 and a blade portion 300. The front and rear ends of the neck portion 200 are smoothly connected to the blade portion 300 and the handle portion 100 respectively. The front end of the blade portion 300 forms a cutting end. The diameter of the blade portion 300 is smaller than the diameter of the handle portion 100. The cross-sectional size of the neck portion 200 gradually decreases from back to front. The front end of the chip groove 330 extends to the front end of the blade portion 300 and is connected to the chip groove 320. The rear end of the chip groove 330 extends to the handle portion 100 through the blade portion 300 and the neck portion 200 in sequence.

[0045] It can be understood that by extending the chip groove 330 to the shank portion 100, the overall rigidity of the round nose knife of this embodiment can be improved, and the overall impact resistance of the round nose knife of this embodiment can be improved; at the same time, the chip groove 330 extends to the shank portion 100, so that the coolant can flow from the shank portion 100 along the chip groove 330 to the cutting end, so as to improve the cooling effect of the round nose knife of this embodiment during operation.

[0046] In some embodiments of the present invention, reference Figure 1 and Figure 3 A circumferential edge 350 is formed between any two adjacent chip grooves 330. The circumferential edge 350 has a circumferential edge rake angle 351, a first circumferential edge clearance angle 352 and a second circumferential edge clearance angle 353. The angle a1 of the circumferential edge rake angle 351 satisfies: 2°≤a1≤10°, the angle a2 of the first circumferential edge clearance angle 352 satisfies: 4°≤a2≤8°, and the angle a3 of the second circumferential edge clearance angle 353 satisfies: 15°≤a3≤20°.

[0047] It can be understood that by setting the angle a1 of the circumferential blade rake angle 351 to 2°≤a1≤10°, the circumferential blade 350 can meet the cutting sharpness requirements of most composite materials, and the cutting edge of the circumferential blade 350 can be lighter during cutting to reduce the generation of cutting heat. When the round nose knife of the present application is cutting titanium-aluminum composite materials, the probability of chip sticking at the circumferential blade 350 can be reduced, and the probability of material peeling, cutting edge chipping, etc. at the cutting edge of the circumferential blade 350 can be reduced.

[0048] It can be understood that by setting the angle a2 of the first back angle 352 of the peripheral blade to 4°≤a2≤8°, and setting the angle a3 of the second back angle 353 of the peripheral blade to 15°≤a3≤20°, the cutting edge of the peripheral blade 350 can have sufficient strength, and the wear resistance and collapse resistance of the round nose knife of the present application during the rough processing of the material can be improved, so that the round nose knife of the present application can be more suitable for the processing of materials with a tendency to stick to chips, such as titanium aluminum composite materials.

[0049] In a further embodiment of the present utility model, the peripheral edge 350 has a peripheral-edge flank face, which includes a first section and a second section that are smoothly connected. The first section is a flat surface, and a first peripheral-edge clearance angle 352 is formed between the first section and the cutting plane of the peripheral edge 350. The second section is an arc surface, and a second peripheral-edge clearance angle 353 is formed between the second section and the cutting plane of the peripheral edge 350.

[0050] It can be understood that by setting the second section as an arc and setting the angle a3 of the second peripheral-edge clearance angle 353 to 15° ≤ a3 ≤ 20°, while the flank face of the peripheral edge 350 satisfies good clearance performance, it can also make the cutting edge of the peripheral edge 350 have better strength and rigidity.

[0051] In some embodiments of the present utility model, referring to Figure 3 , the width l1 of the first section satisfies: 0.08 mm ≤ l1 ≤ 0.15 mm.

[0052] It can be understood that by setting the width l1 of the first section to 0.08 mm ≤ l1 ≤ 0.15 mm, the peripheral edge 350 can have a better finishing effect.

[0053] In some embodiments of the present utility model, the helix angle α of the chip flute 330 satisfies: 37° ≤ b ≤ 39°.

[0054] It can be understood that by setting the helix angle α of the chip flute 330 to 37° ≤ b ≤ 39°, while making the peripheral edge 350 have good sharpness, it can improve the wear resistance and chipping resistance of the peripheral edge 350, and further improve the service life of the round-nose cutter in this embodiment.

[0055] In some embodiments of the present utility model, referring to Figure 5 , the end edge 310 has an end-edge rake angle 311, a first end-edge clearance angle 312, and a second end-edge clearance angle 313. The angle b1 of the end-edge rake angle 311 satisfies: 0° ≤ b1 ≤ 6°, the angle b2 of the first end-edge clearance angle 312 satisfies: 6° ≤ b2 ≤ 12°, and the angle b3 of the second end-edge clearance angle 313 satisfies: 18° ≤ b3 ≤ 26°.

[0056] In some embodiments of the present utility model, referring to Figure 5 , the diameter of the cutting end is D. The end edge 310 has an end-edge flank face, which includes a third section and a fourth section that are smoothly connected. Both the third section and the fourth section are flat surfaces. The width l2 of the third section satisfies: l2 = 0.1D. A first end-edge clearance angle 312 is formed between the third section and the cutting plane of the end edge 310, and a second end-edge clearance angle 313 is formed between the fourth section and the cutting plane of the end edge 310.

[0057] It can be understood that the end edge 310 adopts a double-plane flank angle structure with both a first end-edge flank angle 312 and a second end-edge flank angle 313. The setting of the double-plane flank angle structure enables the end edge 310 of the round nose cutter in this embodiment to have better sharpness, and the end edge 310 of the round nose cutter in this embodiment can be more brisk when cutting a workpiece. At the same time, the setting of the double-plane flank angle structure can reduce the generation of cutting heat when the end edge 310 cuts the workpiece, so that the end edge 310 can be in a state of lower temperature, thereby enabling the end edge 310 to have a longer service life.

[0058] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A round nose cutter, characterized in that, The round nose cutter is provided with a cutting end, and multiple end edges are arranged on the cutting end. The multiple end edges are circumferentially arranged around the axis of the round nose cutter, and a chip groove is formed between any two adjacent end edges. The front tool face of the end edge forms part of the groove wall of the chip groove; multiple chip evacuation grooves are formed on the peripheral surface of the round nose cutter, and the chip evacuation grooves correspond to and communicate with the chip grooves one by one. A chip breaking groove is arranged at the junction of the front tool face of the end edge and the chip evacuation groove.

2. The round nose cutter according to claim 1, wherein, The round nose cutter includes a tool shank portion, a tool neck portion, and a cutting edge portion. The opposite ends of the tool neck portion are smoothly connected to the tool shank portion and the cutting edge portion respectively. One end of the cutting edge portion away from the tool neck portion forms the cutting end. Along the direction close to the cutting edge portion, the cross-sectional dimension of the tool neck portion gradually decreases. The chip evacuation grooves sequentially pass through the cutting edge portion and the tool neck portion and extend to the tool shank portion.

3. The round nose cutter according to claim 2, characterized in that, A peripheral edge is formed between any two adjacent chip evacuation grooves. The peripheral edge has a peripheral edge rake angle, a first peripheral edge clearance angle, and a second peripheral edge clearance angle. The angle a1 of the peripheral edge rake angle satisfies: 2° ≤ a1 ≤ 10°. The angle a2 of the first peripheral edge clearance angle satisfies: 4° ≤ a2 ≤ 8°. The angle a3 of the second peripheral edge clearance angle satisfies: 15° ≤ a3 ≤ 20°.

4. A round nose cutter according to claim 3, characterized in that, The peripheral edge has a peripheral edge flank. The peripheral edge flank includes a first section and a second section that are smoothly connected. The first section is a plane, and the first peripheral edge clearance angle is formed between the first section and the cutting plane of the peripheral edge. The second section is an arc surface, and the second peripheral edge clearance angle is formed between the second section and the cutting plane of the peripheral edge.

5. The round nose cutter according to claim 4, wherein The width l1 of the first section satisfies: 0.08 mm ≤ l1 ≤ 0.15 mm.

6. The round nose cutter according to claim 3, characterized in that, The diameter of the cutting edge portion is D, and the core diameter of the peripheral edge is 0.6D.

7. A round nose cutter according to any one of claims 1 to 6, characterized in that The angle α of the helix angle of the chip evacuation groove satisfies: 37° ≤ β ≤ 39°.

8. A round nose cutter according to claim 1, characterized in that, The end edge has an end edge rake angle, a first end edge clearance angle, and a second end edge clearance angle. The angle b1 of the end edge rake angle satisfies: 0° ≤ b1 ≤ 6°. The angle b2 of the first end edge clearance angle satisfies: 6° ≤ b2 ≤ 12°. The angle b3 of the second end edge clearance angle satisfies: 18° ≤ b3 ≤ 26°.

9. The round nose cutter according to claim 8, characterized in that, The diameter of the cutting end is D. The end edge has an end edge flank. The end edge flank includes a third section and a fourth section that are smoothly connected. The width l2 of the third section satisfies: l2 = 0.1D. The first end edge clearance angle is formed between the third section and the cutting plane of the end edge. The second end edge clearance angle is formed between the fourth section and the cutting plane of the end edge.

10. A round nose cutter according to claim 1, characterized in that, Three end edges are arranged on the cutting end.

Images