Flat-bottomed knife

Abstract

The utility model discloses a flat-bottomed knife which comprises a knife neck part and a knife edge part, one end of the knife edge part is connected with the knife neck part, the other end of the knife edge part is provided with a chisel edge and two end edges, the two end edges are circumferentially arranged around the axis of the knife edge part, the chisel edge is formed between the two end edges, and the extension direction of the chisel edge is parallel to the extension direction of the end edges. According to the flat-bottomed cutter, the chisel edge is formed between the two end edges, and the extending direction of the chisel edge is parallel to the extending direction of the end edges, so that the end of the flat-bottomed cutter has the butterfly-shaped angle of 0 degree, and in the process that the flat-bottomed cutter is used for machining the circumferential surface of the rotary body, the end edges can be tightly attached to the surface of the rotary body; therefore, machining traces such as cutter lines and raised grains on the rotary body are reduced, and the appearance quality of the machined rotary body is improved.

Description

Technical Field

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

[0002] When milling a rotary body, there is a situation of machining along the circumferential surface of the rotary body. When machining along the circumferential surface of the rotary body, it is necessary to rotate the rotary body so that the cutter can smoothly move relative to the circumferential surface of the rotary body.

[0003] However, when the existing cutter is used to machine the circumferential surface of the rotary body, since the circumferential surface of the rotary body is an arc surface, during the rotation of the rotary body, the bottom edge of the cutter is difficult to always closely adhere to the circumferential surface of the rotary body, so that the cutter is likely to leave machining marks such as tool marks and wavy lines on the rotary body, resulting in poor appearance of the machined rotary body. Summary of the Utility Model

[0004] An object of the utility model is to solve at least one of the technical problems existing in the prior art. The utility model provides a flat-bottom cutter, and the rotary body processed by using the flat-bottom cutter of the utility model has a better appearance.

[0005] The flat-bottom cutter provided according to an embodiment of the utility model includes a tool neck and a cutting edge part. One end of the cutting edge part is connected to the tool neck, a transverse edge and two end edges are provided at the other end of the cutting edge part, the two end edges are arranged circumferentially around the axis of the cutting edge part, the transverse edge is formed between the two end edges, and the extending direction of the transverse edge is parallel to the extending direction of the end edge.

[0006] The flat-bottom cutter of the utility model has at least the following beneficial effects: in the flat-bottom cutter of the present application, a transverse edge is formed between the two end edges, and the extending direction of the transverse edge is parallel to the extending direction of the end edge, so that the end of the flat-bottom cutter of the present application has a 0° butterfly angle. During the process of machining the circumferential surface of the rotary body with the flat-bottom cutter of the present application, the end edge can closely adhere to the surface of the rotary body to reduce the generation of machining marks such as tool marks and wavy lines on the rotary body, thereby improving the appearance quality of the machined rotary body.

[0007] According to the flat-bottom cutter described in the embodiment of the utility model, along the axial direction of the cutting edge part, the transverse edge is located on the side of the end edge away from the tool neck, and the distance between the transverse edge and the end edge is l 1 , l 1 satisfies: 0mm ≤ l 1 ≤ 0.01mm.

[0008] According to the flat-bottom cutter described in the embodiment of the utility model, the length l 2 of the transverse edge satisfies: 0.14mm ≤ l 2 ≤ 0.20mm.

[0009] According to the end mill of the embodiment of the present utility model, the end cutting edge is provided with an end cutting edge rake angle, a first end cutting edge clearance angle and a second end cutting edge clearance angle, and the angle α of the end cutting edge rake angle 1 satisfies: 0° ≤ α 1 ≤ 6°, the angle α of the first end cutting edge clearance angle 2 satisfies: 6° ≤ α 2 ≤ 10°, the angle α of the second end cutting edge clearance angle 3 satisfies: 18° ≤ α 3 ≤ 22°.

[0010] According to the end mill of the embodiment of the present utility model, two peripheral cutting edges are provided on the circumferential side of the cutting edge part. The peripheral cutting edges are arranged corresponding to the end cutting edge. A chip discharge groove is formed between the two peripheral cutting edges, and a chip accommodation groove is formed between the two end cutting edges. The chip accommodation groove and the chip discharge groove correspond to each other and are communicated. The distance l between the center point of the transverse cutting edge and the chip accommodation groove 3 satisfies: 0.04 mm ≤ l 3 ≤ 0.1 mm.

[0011] According to the end mill of the embodiment of the present utility model, a peripheral cutting edge rake angle and a peripheral cutting edge circular clearance angle are provided on the peripheral cutting edge, and the angle β of the peripheral cutting edge rake angle 1 satisfies: 2° ≤ β 1 ≤ 8°, the angle β of the peripheral cutting edge circular clearance angle 2 satisfies: 8° ≤ β 2 ≤ 12°.

[0012] According to the end mill of the embodiment of the present utility model, the spiral angle of the chip discharge groove is 35°.

[0013] According to the end mill of the embodiment of the present utility model, the diameter of the cutting edge part is D, and the core diameter of the peripheral cutting edge is 0.6D.

[0014] The additional aspects and advantages of the present utility model will be partly given in the following description, partly become obvious from the following description, or be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present utility model will be further described below in conjunction with the drawings and embodiments;

[0016] Figure 1 is a schematic structural diagram of an end mill according to an embodiment of the present utility model;

[0017] Figure 2 is Figure 1 the axial schematic diagram of the shown end mill;

[0018] Figure 3 is Figure 2 the schematic structural diagram of the shown end mill from the A-direction view;

[0019] Figure 4For Figure 3 Partial enlarged view of the structure at position C of the flat-bottom cutter shown

[0020] Figure 5 Schematic structural diagram of the end edge of an embodiment of the present utility model

[0021] Figure 6 Schematic structural diagram of the peripheral edge of an embodiment of the present utility model

[0022] Figure 7 For Figure 2 Sectional view taken along line B-B of the flat-bottom cutter shown

[0023] Reference numerals

[0024] Tool neck 100

[0025] Cutting edge part 200; Transverse edge 210; End edge 220; End-edge front angle 221; First end-edge relief angle 222; Second end-edge relief angle 223; Peripheral edge 230; Peripheral-edge front angle 231; Peripheral-edge arc relief angle 232; Chip flute 240; Chip pocket 250 Detailed implementation manners

[0026] 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 in the text part of the specification, enabling people to visually and vividly understand each technical feature and the overall technical solution of the present utility model, but it cannot be understood as a limitation on the protection scope of the present utility model

[0027] In the description of the present utility model, it should be understood that the orientation descriptions such as up, down, front, back, left, right, etc. indicate the orientation or positional relationship 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 cannot be understood as a limitation on the present utility model

[0028] In the description of the present utility model, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, exceeding, etc. are understood as not including the present number, above, below, within, etc. are understood as including the present 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 indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features

[0029] In the description of the present utility model, unless otherwise clearly defined, words such as setting, installation, connection, etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above words in the present utility model in combination with the specific content of the technical solution

[0030] The following will refer to Figures 1 to 7 the flat-bottom cutter of the present application for a detailed description.

[0031] Refer to Figures 1 to 3 , the flat-bottom cutter according to an embodiment of the present utility model includes a tool neck portion 100 and a cutting edge portion 200. One end of the cutting edge portion 200 is connected to the tool neck portion 100. A transverse edge 210 and two end edges 220 are provided at the other end of the cutting edge portion 200. The two end edges 220 are arranged circumferentially around the axis of the cutting edge portion 200. The transverse edge 210 is formed between the two end edges 220, and the extending direction of the transverse edge 210 is parallel to the extending direction of the end edge 220.

[0032] Refer to Figures 1 to 3 , in this embodiment, the flat-bottom cutter extends in the front-rear direction. The rear end of the cutting edge portion 200 is connected to the front end of the tool neck portion 100. A transverse edge 210 and two end edges 220 are provided at the front end of the cutting edge portion 200. The two end edges 220 are arranged circumferentially around the axis extending in the front-rear direction of the cutting edge portion 200. The transverse edge 210 is formed between the two end edges 220, and the opposite ends of the transverse edge 210 respectively extend to the two end edges 220, and in the front-rear direction, the transverse edge 210 and the end edge 220 are arranged in parallel.

[0033] It can be understood that since a transverse edge 210 is formed between the two end edges 220 and the transverse edge 210 is arranged in parallel with the end edge 220, a 0° butterfly angle is formed at the front end of the cutting edge portion 200. Furthermore, during the process of machining the circumferential surface of the rotating body by the flat-bottom cutter in this embodiment, the end edge 220 can closely adhere to the circumferential surface of the rotating body to prevent the end edge 220 from being difficult to continuously mill the rotating body due to the generation of gaps or jumps between the end edge 220 and the product during the rotation of the rotating body; at the same time, the setting of the transverse edge 210 enables the end edge 220 to tightly adhere to the product even when there is a relative yaw or relative rotation between the flat-bottom cutter in this embodiment and the rotating body, thereby reducing the appearance of defective surface machining traces such as tool marks and wavy lines on the surface of the rotating body after machining; moreover, the transverse edge 210 also has certain cutting performance to improve the cutting effect of the flat-bottom cutter in this embodiment on the rotating body.

[0034] Refer to Figure 4 , in a further embodiment of the present utility model, the transverse edge 210 is located on the front side of the end edge 220, and the distance between the transverse edge 210 and the end edge 220 is l 1 , l 1 satisfies: 0 mm ≤ l 1 ≤ 0.01 mm.

[0035] It can be understood that through the above design, the cutting resistance of the chisel edge 210 can be reduced, and the edge rigidity at the chisel edge 210 can be improved, so that the chisel edge 210 has a longer service life.

[0036] In a further embodiment of the present utility model, in order to enable the chisel edge 210 to have a certain effective edge length, referring to Figure 4 , the length l of the chisel edge 210 2 satisfies: 0.14 mm ≤ l 2 ≤ 0.20 mm.

[0037] In some embodiments of the present utility model, referring to Figure 5 , a chisel edge front angle 221, a first chisel edge rear angle 222 and a second chisel edge rear angle 223 are provided on the end edge 220. The angle a of the chisel edge front angle 221 1 satisfies: 0°

[0038] ≤ a 1 ≤ 6°, the angle a of the first chisel edge rear angle 222 2 satisfies: 6° ≤ a 2 ≤ 10°, the angle a of the second chisel edge rear angle 223 3 satisfies: 18° ≤ a 3 ≤ 22°.

[0039] It can be understood that in this embodiment, the end edge 220 of the flat-bottom cutter adopts a double-plane rear angle structure with both the first chisel edge rear angle 222 and the second chisel edge rear angle 223. The setting of the double-plane rear angle structure can make the end edge 220 of the flat-bottom cutter in this embodiment have better sharpness, and the end edge 220 of the flat-bottom cutter in this embodiment can be more brisk when cutting the workpiece; at the same time, the setting of the double-plane rear angle structure can reduce the generation of cutting heat when the end edge 220 cuts the workpiece, so that the end edge 220 can be in a state of lower temperature, thereby enabling the end edge 220 to have a longer service life.

[0040] In some embodiments of the present utility model, referring to Figure 2 and Figure 3 , two peripheral edges 230 are provided on the circumferential side of the cutting edge portion 200. The peripheral edges 230 are arranged corresponding to the end edge 220. A chip discharge groove 240 is formed between the two peripheral edges 230, a chip accommodation groove 250 is formed between the two end edges 220, the chip accommodation groove 250 and the chip discharge groove 240 correspond to each other and are communicated, and the distance l between the center point of the chisel edge 210 and the chip accommodation groove 250 3 satisfies: 0.04 mm ≤ l 3 ≤ 0.1 mm.

[0041] It can be understood that the provision of the peripheral blade 230 enables the flat bottom cutter of this embodiment to perform not only end milling but also side milling of the workpiece, so that the flat bottom cutter of this embodiment can be used for multiple purposes.

[0042] In a further embodiment of the present invention, reference Figure 6 The peripheral blade 230 is provided with a peripheral blade rake angle 231 and a peripheral blade arc back angle 232. The angle b of the peripheral blade rake angle 231 is 1 Satisfy: 2°≤b 1 ≤8°, angle b of the circumferential edge arc back angle 232 2 Satisfy: 8°≤b 2 ≤12°.

[0043] It can be understood that, due to the angle b of the peripheral rake angle 231 1 Satisfy: 2°≤b 1 ≤8°, so that the circumferential blade 230 has good sharpness while also having good thermal wear resistance and fracture resistance; when the circumferential blade 230 cuts the workpiece, the circumferential blade 230 can cut the workpiece more easily and the circumferential blade 230 can have a longer service life.

[0044] It can be understood that in the flat-bottomed knife of the present embodiment, the back cutting surface of the peripheral blade 230 is set to be arc-shaped. Compared with the flat back cutting surface, the arc-shaped back cutting surface can make the edge of the peripheral blade 230 more resistant to chipping and wear, so as to increase the service life of the peripheral blade 230, thereby extending the overall service life of the flat-bottomed knife of the present embodiment.

[0045] In some embodiments of the present invention, in order to make the flat bottom cutter of the present application more efficient, the helix angle of the chip groove 240 is set to 35°.

[0046] It can be understood that by setting the helix angle of the chip groove 240 to a smaller 35°, the lead of the chip groove 240 can be reduced while maintaining the sharpness and rigidity of the peripheral edge 230, so that the chips generated by the flat-bottomed knife of this embodiment during the processing of the workpiece can be discharged along the chip groove 240 more quickly; at the same time, since the chips can be discharged along the chip groove 240 more quickly, the heat diffused by the chips to the wall of the chip groove 240 can be reduced, so that the flat-bottomed knife of the present application has a longer service life.

[0047] In some embodiments of the present invention, reference Figure 7 The diameter of the blade portion 200 is D, and the core diameter of the peripheral blade 230 is 0.6D.

[0048] It can be understood that the setting of the relatively small core diameter of the peripheral edge 230 enables the flat-bottom cutter of this embodiment to have a larger chip evacuation space when machining a workpiece, so that the cutting chips can be discharged more smoothly along the chip evacuation groove 240.

[0049] 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 flat bottom knife, characterized in that: include: knife neck; A blade portion, one end of which is connected to the blade neck portion, and the other end of which is provided with a transverse edge and two end edges, the two end edges being arranged circumferentially around the axis of the blade portion, the transverse edge being formed between the two end edges, and the extension direction of the transverse edge being parallel to the extension direction of the end edges.

2. A flat bottom knife according to claim 1, characterized in that: Along the axial direction of the blade portion, the chisel edge is located on a side of the end edge away from the blade neck portion, and a distance between the chisel edge and the end edge is l1, and l1 satisfies: 0mm≤l1≤0.01mm.

3. A flat bottom knife according to claim 1, characterized in that: The length l2 of the chisel edge satisfies: 0.14mm≤l2≤0.20mm.

4. A flat bottom knife according to claim 1, characterized in that: The end blade is provided with an end blade rake angle, a first end blade clearance angle and a second end blade clearance angle. The angle a1 of the end blade rake angle satisfies: 0°≤a1≤6°, the angle a2 of the first end blade clearance angle satisfies: 6°≤a2≤10°, and the angle a3 of the second end blade clearance angle satisfies: 18°≤a3≤22°.

5. A flat bottom knife according to claim 1, characterized in that: Two circumferential edges are provided on the circumferential side of the blade portion, and the circumferential edges are arranged corresponding to the end edges. A chip groove is formed between the two circumferential edges, and a chip containing groove is formed between the two end edges. The chip containing grooves correspond to the chip grooves one by one and are connected. The distance l3 between the center point of the transverse edge and the chip containing groove satisfies: 0.04mm≤13≤0.1mm.

6. A flat bottom knife according to claim 5, characterized in that: The circumferential blade is provided with a circumferential blade rake angle and a circumferential blade arc clearance angle. The angle b1 of the circumferential blade rake angle satisfies: 2°≤b1≤8°, and the angle b2 of the circumferential blade arc clearance angle satisfies: 8°≤b2≤12°.

7. A flat bottom knife according to claim 5, characterized in that: The helix angle of the chip removal groove is 35°.

8. A flat bottom knife according to claim 5, characterized in that: The diameter of the blade portion is D, and the core diameter of the peripheral blade is 0.6D.

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