Bottom-edge chip-dividing milling cutter

Abstract

The utility model discloses a bottom edge chip-dividing milling cutter which comprises a cutter handle and a cutting part connected with the bottom end of the cutter handle, long edges and short edges are distributed at the bottom end of the cutting part in the circumferential direction, spiral chip grooves are formed between the long edges and the short edges and spirally extend in the direction close to the cutter handle, and the bottom ends of the long edges are lower than the bottom ends of the short edges. The short edge is located at the position, close to the outer circle, of the bottom end of the cutting part, the machining area of the short edge is a first machining area, the machining area of the long edge is a second machining area, the first machining area and the second machining area are sequentially distributed in the radial inward direction of the bottom end of the cutting part, and the long edge and the short edge are matched for chip separation. According to the bottom edge chip-dividing milling cutter, under the condition that an auxiliary chip breaking structure is not added, the working principle of the bottom edge of the cutter is ingeniously utilized, the effects of chip breaking and chip dividing of the bottom edge are achieved in the drilling and plunge milling process through the high-low edge structure of the bottom edge, and the production time and the production cost of the cutter are not increased.

Description

Technical Field

[0001] The utility model relates to the technical field of cutting tools, in particular to a bottom-edge chip-dividing milling cutter. Background Art

[0002] A milling cutter is a rotating tool with one or more teeth used for milling. When working, each tooth cuts off the excess of the workpiece intermittently in sequence.

[0003] When the milling cutter is fed axially, it can drill and plunge mill the workpiece.

[0004] When the milling cutter drills and inserts the workpiece, if the chip removal of the milling cutter is not smooth, the milling cutter is prone to chip entanglement, affecting the accuracy of the workpiece processing surface. In related technologies, most of them use methods such as adding auxiliary chip breaking structures such as bottom edge chip breaker grooves and side edge wavy rough skin knife structures to solve this problem.

[0005] However, by adding chip breaking auxiliary structure, the tool production time and production cost will be increased invisibly. Utility Model Content

[0006] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a bottom blade chip splitting milling cutter, which can cleverly utilize the working principle of the bottom blade of the tool without adding an auxiliary chip breaking structure, and achieve the effect of bottom blade chip breaking and chip splitting in the process of drilling and plunging through the structure of the high and low blades of the bottom blade, without increasing the production time and production cost of the tool.

[0007] According to the first aspect of the utility model, a bottom-edge chip milling cutter comprises a shank and a cutting portion connected to the bottom end of the shank, the bottom end of the cutting portion is circumferentially distributed with a long edge and a short edge, a spiral chip groove is formed between the long edge and the short edge, the spiral chip groove extends spirally in a direction close to the shank, the bottom end height of the long edge is lower than the bottom end height of the short edge, the short edge is located at a position close to the outer circle of the bottom end of the cutting portion, the processing area of ​​the short edge is a first processing area, and the processing area of ​​the long edge is a second processing area, the first processing area and the second processing area are distributed sequentially along the radial inward direction of the bottom end of the cutting portion, and the long edge and the short edge cooperate to split chips.

[0008] A bottom-edge chip-splitting milling cutter according to an embodiment of the utility model has at least the following beneficial effects:

[0009] 1. The utility model has long edges and short edges circumferentially distributed at the bottom end of the cutting portion, and a spiral chip groove is formed between the long edges and the short edges. The spiral chip groove extends spirally in the direction close to the tool handle. It can be understood that during the drilling and plunge milling process, metal chips cut out by the long edges or the short edges can be discharged upward through the spiral chip groove, thereby avoiding the accumulation of metal chips at the processing position and affecting the cutting process of the milling cutter.

[0010] 2. The utility model makes the bottom end height of the long blade lower than the bottom end height of the short blade, and the short blade is located at the bottom end of the cutting portion close to the outer circle. The processing area of ​​the short blade is the first processing area, and the processing area of ​​the long blade is the second processing area. The first processing area and the second processing area are distributed in sequence along the radial inward direction of the bottom end of the cutting portion, and the long blade and the short blade cooperate to divide chips. It should be explained that the bottom end height of the long blade and the bottom end height of the short blade refer to the axial height of the long blade and the short blade away from the tool handle. It can be understood that since the bottom end height of the long blade is lower than the bottom end height of the short blade, when the milling cutter is fed axially downward, the short blade first contacts and cuts the workpiece, and the long blade does not play a processing role in the processing area of ​​the short blade, so that the processing area of ​​the short blade forms the first processing area, and in the area outside the short blade The domain, that is, the inner circle area, is not covered by the short blade, and this area is processed by the long blade, so that the processing area of ​​the long blade forms a second processing area. Since the first processing area and the second processing area are processed by the short blade and the long blade respectively, the first processing area and the second processing area can cut out metal chips respectively, and the shapes and lengths of the metal chips cut out by the first processing area and the second processing area are controlled by the short blade and the long blade respectively. Therefore, the milling cutter can play the effect of chip splitting and chip breaking when performing axial movement such as milling or drilling. Furthermore, the milling cutter cleverly utilizes the working principle of the bottom blade of the tool without adding an auxiliary chip breaking structure, and realizes the effect of chip breaking and chip splitting of the bottom blade during drilling and milling through the structure of the high and low blades of the bottom blade, without increasing the production time and production cost of the tool.

[0011] According to some embodiments of the present invention, a height difference between a bottom end of the long blade and a bottom end of the short blade is a first height, and the first height is 0.01-0.02 mm.

[0012] According to some embodiments of the utility model, at least one of the long blade and the short blade has a first front angle located on the front side and a first rear edge segment and a second rear edge segment located on the rear side, the first front angle is 4°, the length of the first rear edge segment is 0.8±0.05mm, the angle between the first rear edge segment and the tangent line of the outer circle of the tool is a first angle, the first angle is 8.5-10°, the angle between the second rear edge segment and the tangent line of the outer circle of the tool is a second angle, and the second angle is 18-20°.

[0013] According to some embodiments of the present invention, two of the long edges and two of the short edges are respectively provided, and the long edges and the short edges are spaced apart and distributed along the circumference of the cutting portion.

[0014] According to some embodiments of the present invention, the spiral chip groove includes a first chip groove and a second chip groove, the first chip groove is located between the front side of the long edge and the short edge, and the first chip groove is used for chip removal of the long edge, and the second chip groove is located between the front side of the short edge and the long edge, and the second chip groove is used for chip removal of the short edge.

[0015] According to some embodiments of the present invention, the bottom ends of the first chip groove and the second chip groove adjacent to the short edge are cut through.

[0016] According to some embodiments of the utility model, the two side walls of the first chip groove respectively form a first side edge and a second side edge, the first side edge is connected to the short edge, the second side edge is connected to the long edge, the helix angle of the first side edge is a first helix angle, and the first helix angle is 46°, the helix angle of the second side edge is a second helix angle, and the second helix angle is 43°.

[0017] According to some embodiments of the present invention, at least one of the first side edge and the second side edge has a second front angle located at the front side and a first back angle located at the back side, the second front angle is 4±1°, and the first back angle is 10°.

[0018] According to some embodiments of the present invention, the angle between the front side of the second side edge and the adjacent first side edge is a third angle, and the third angle is 85°. The angle between the rear side of the second side edge and the adjacent first side edge is a fourth angle, and the fourth angle is 95°.

[0019] According to some embodiments of the present invention, the groove bottom of the spiral chip groove is arc-shaped, and the core diameter of the groove bottom of the spiral chip groove is 0.6D.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0022] Figure 1 It is a structural schematic diagram of a bottom blade chip-dividing milling cutter according to an embodiment of the utility model;

[0023] Figure 2 for Figure 1 The working principle diagram of the first perspective is shown;

[0024] Figure 3 for Figure 1 The working principle diagram of the second viewing angle is shown;

[0025] Figure 4 for Figure 1 A partial enlarged view of the bottom end viewed from above is shown;

[0026] Figure 5 for Figure 1 A schematic diagram of the structure of the cutting portion shown;

[0027] Figure 6 for Figure 5 AA cross-sectional view shown;

[0028] Figure 7 for Figure 6 A partial enlarged view is shown.

[0029] Figure markings: 100-shank, 110-cutting part, 120-long edge, 130-short edge, 140-spiral chip groove, 150-first processing area, 160-second processing area, 170-first height, 180-first front angle, 190-first rear edge section, 200-second rear edge section, 210-first angle, 220-second angle, 230-first chip groove, 240-second chip groove, 250-first side edge, 260-second side edge, 270-first helix angle, 280-second helix angle, 290-second front angle, 300-first rear angle, 310-third angle, 320-fourth angle, 330-core diameter. DETAILED DESCRIPTION

[0030] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0031] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 invention.

[0032] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] A bottom-edge chip-splitting milling cutter according to an embodiment of the utility model will be described below in conjunction with the accompanying drawings.

[0035] Reference Figure 1 , Figure 2 , Figure 3 and Figure 5 A bottom-edge chip milling cutter according to an embodiment of the utility model comprises a tool handle 100 and a cutting portion 110 connected to the bottom end of the tool handle 100 .

[0036] As for the tool handle 100 , the tool handle 100 is used for clamping and fixing.

[0037] Regarding the cutting portion 110 , a long edge 120 and a short edge 130 are circumferentially distributed at the bottom end of the cutting portion 110 , and a spiral chip groove 140 is formed between the long edge 120 and the short edge 130 . The spiral chip groove 140 extends spirally in a direction close to the tool handle 100 .

[0038] It is understandable that during the drilling and plunging process, the metal chips cut out by the long edge 120 or the short edge 130 can be discharged upward through the spiral chip groove 140 to prevent the metal chips from accumulating at the processing position and affecting the cutting process of the milling cutter.

[0039] Furthermore, the bottom end height of the long edge 120 is lower than the bottom end height of the short edge 130. The short edge 130 is located at the bottom end of the cutting portion 110 close to the outer circle. The processing area of ​​the short edge 130 is the first processing area 150, and the processing area of ​​the long edge 120 is the second processing area 160. The first processing area 150 and the second processing area 160 are distributed sequentially along the radial inward direction of the bottom end of the cutting portion 110, and the long edge 120 and the short edge 130 cooperate to split chips.

[0040] It should be explained that the bottom end height of the long edge 120 and the bottom end height of the short edge 130 refer to the axial height of the long edge 120 and the short edge 130 away from the handle 100 .

[0041] It can be understood that, since the bottom end height of the long edge 120 is lower than the bottom end height of the short edge 130, when the milling cutter is axially fed downward, the short edge 130 first contacts and cuts the workpiece, and the long edge 120 does not play a processing role in the processing area of ​​the short edge 130, so that the processing area of ​​the short edge 130 forms a first processing area 150, and the area outside the short edge 130, that is, the inner circle area, is not covered by the short edge 130, and this area is processed by the long edge 120, so that the processing area of ​​the long edge 120 forms a second processing area 160. Since the first processing area 150 and the second processing area 160 are respectively formed by the short edge 130 and the long edge 120, 0 processing, so that the first processing area 150 and the second processing area 160 can respectively cut out metal chips, and the shapes and lengths of the metal chips cut out by the first processing area 150 and the second processing area 160 are respectively controlled by the short edge 130 and the long edge 120, so that the milling cutter can play the effect of chip splitting and chip breaking when performing axial movements such as plunging or drilling. Furthermore, the milling cutter can cleverly utilize the working principle of the bottom edge of the tool without adding an auxiliary chip breaking structure, and through the structure of the high and low edges of the bottom edge, the effect of chip breaking and chip splitting of the bottom edge is achieved during the drilling and plunging processes without increasing the production time and production cost of the tool.

[0042] In some specific embodiments, the height difference between the bottom end of the long edge 120 and the bottom end of the short edge 130 is a first height 170, and the first height 170 is 0.01-0.02 mm, thereby making the height difference between the long edge 120 and the short edge 130 smaller, thereby reducing the structural changes of the milling cutter and avoiding increasing the time and cost of tool manufacturing.

[0043] In some specific embodiments, the radial length of the short blade is designed to be 0.25-0.28D. It should be explained that 0.25-0.28D refers to 0.25-0.28 times the blade diameter of the tool.

[0044] Reference Figure 4 In some specific embodiments, at least one of the long edge 120 and the short edge 130 has a first front angle 180 located on the front side and a first rear edge segment 190 and a second rear edge segment 200 located on the rear side, the first front angle 180 is 4°, the length of the first rear edge segment 190 is 0.8±0.05mm, the angle between the first rear edge segment 190 and the tangent line of the outer circle of the tool is a first angle 210, the first angle 210 is 8.5-10°, the angle between the second rear edge segment 200 and the tangent line of the outer circle of the tool is a second angle 220, and the second angle 220 is 18-20°.

[0045] It should be explained that the first front angle 180 refers to the angle between the front side of the blade and the line connecting the tip of the blade to the axis of the milling cutter.

[0046] It can be understood that by reasonably setting the angles of the first rake angle 180, the first angle 210 and the second angle 220, the long edge 120 and the short edge 130 have good edge strength and rigidity as well as good cutting sharpness, thereby effectively improving the processing efficiency of the tool while ensuring the service life of the tool.

[0047] In some specific embodiments, two long edges 120 and two short edges 130 are respectively provided, and the long edges 120 and the short edges 130 are distributed at intervals along the circumference of the cutting portion 110, so that the long edges 120 and the short edges 130 can have two cutting edges to cooperate in cutting during cutting processing, thereby enabling the tool to maintain a good chip removal space while ensuring good cutting efficiency.

[0048] In some specific embodiments, the spiral chip groove 140 includes a first chip groove 230 and a second chip groove 240. The first chip groove 230 is located between the front side of the long edge 120 and the short edge 130, and the first chip groove 230 is used for chip removal of the long edge 120. The second chip groove 240 is located between the front side of the short edge 130 and the long edge 120, and the second chip groove 240 is used for chip removal of the short edge 130. In this way, the metal chips cut by the long edge 120 and the short edge 130 can be discharged along different chip grooves, thereby preventing the metal chips cut by the long edge 120 and the short edge 130 from being entangled and stuck with each other.

[0049] Furthermore, the bottom ends of the first chip groove 230 and the second chip groove 240 adjacent to the short edge 130 are cut through, thereby ensuring that there is a good chip removal space during the use of the tool and effectively avoiding chip blockage.

[0050] In some specific embodiments, the two side walls of the first chip groove 230 respectively form a first side edge 250 and a second side edge 260, the first side edge 250 is connected to the short edge 130, and the second side edge 260 is connected to the long edge 120, the helix angle of the first side edge 250 is a first helix angle 270, and the first helix angle 270 is 46°, and the helix angle of the second side edge 260 is a second helix angle 280, and the second helix angle 280 is 43°. Therefore, the first side edge 250 and the second side edge 260 are structures with unequal lead, which are reasonably matched with the unequal blade distances of the long edge 120 and the short edge 130 to form a better second-order seismic resistance effect, which greatly ensures the processing quality of the product and extends the service life of the tool.

[0051] Reference Figure 6 and Figure 7In some specific embodiments, at least one of the first side edge 250 and the second side edge 260 has a second rake angle 290 located on the front side and a first clearance angle 300 located on the rear side, the second rake angle 290 is 4±1°, and the first clearance angle 300 is 10°. Thus, a reasonable combination of the side edge rake angle and clearance angle enables the tool to have good edge strength and rigidity as well as good cutting sharpness. In addition, a single side edge clearance angle structure makes the design simple and efficient, which effectively improves the tool processing efficiency and reduces the production cost of the enterprise while meeting the good performance of the tool.

[0052] It should be explained that the second front angle 290 refers to the angle between the front side edge of the side edge on the radial section of the tool and the line connecting the tip of the side edge to the tool axis, and the first back angle 300 refers to the angle between the back side edge of the side edge on the radial section of the tool and the tangent of the tool periphery.

[0053] In some specific embodiments, the angle between the front side of the second side edge 260 and the adjacent first side edge 250 is a third angle 310, and the third angle 310 is 85°. The angle between the rear side of the second side edge 260 and the adjacent first side edge 250 is a fourth angle 320, and the fourth angle 320 is 95°.

[0054] It can be understood that by adopting the design of unequal blade spacing, it is possible to maintain good rigidity and strength while ensuring smooth chip evacuation, and to ensure the size and surface accuracy of the hole diameter even during drilling and milling.

[0055] In some specific embodiments, the bottom of the spiral chip groove 140 is arc-shaped, and the core diameter 330 of the bottom of the spiral chip groove 140 is 0.6D. Thus, while the spiral chip groove 140 can smoothly remove chips, it can also maintain good rigidity and strength of the tool.

[0056] It should be explained that 0.6D refers to 0.6 times the cutting edge diameter of the tool.

[0057] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0058] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A bottom-edge chip milling cutter, comprising a tool handle (100) and a cutting portion (110) connected to the bottom end of the tool handle (100), characterized in that: The bottom end of the cutting portion (110) is circumferentially distributed with a long edge (120) and a short edge (130), a spiral chip groove (140) is formed between the long edge (120) and the short edge (130), and the spiral chip groove (140) extends spirally in a direction close to the tool handle (100). The bottom end height of the long edge (120) is lower than the bottom end height of the short edge (130), and the short edge (130) is located at a position close to the outer circle of the bottom end of the cutting portion (110). The processing area of ​​the short edge (130) is a first processing area (150), and the processing area of ​​the long edge (120) is a second processing area (160). The first processing area (150) and the second processing area (160) are sequentially distributed in a radially inward direction from the bottom end of the cutting portion (110), and the long edge (120) and the short edge (130) cooperate to separate chips.

2. A bottom-edge chip-dividing milling cutter according to claim 1, characterized in that: The height difference between the bottom end of the long blade (120) and the bottom end of the short blade (130) is a first height (170), and the first height (170) is 0.01-0.02 mm.

3. A bottom-edge chip-dividing milling cutter according to claim 1, characterized in that: At least one of the long blade (120) and the short blade (130) has a first front angle (180) located at the front side and a first rear edge segment (190) and a second rear edge segment (200) located at the rear side, the first front angle (180) is 4°, the length of the first rear edge segment (190) is 0.8±0.05 mm, the angle between the first rear edge segment (190) and the tangent line of the outer circle of the tool is a first angle (210), the first angle (210) is 8.5-10°, the angle between the second rear edge segment (200) and the tangent line of the outer circle of the tool is a second angle (220), the second angle (220) is 18-20°.

4. A bottom-edge chip-dividing milling cutter according to claim 1, characterized in that: Two of the long edges (120) and two of the short edges (130) are provided respectively, and the long edges (120) and the short edges (130) are spaced apart and distributed along the circumference of the cutting portion (110).

5. A bottom-edge chip-dividing milling cutter according to claim 4, characterized in that: The spiral chip groove (140) includes a first chip groove (230) and a second chip groove (240), wherein the first chip groove (230) is located between the front side of the long edge (120) and the short edge (130), and the first chip groove (230) is used for chip removal of the long edge (120), and the second chip groove (240) is located between the front side of the short edge (130) and the long edge (120), and the second chip groove (240) is used for chip removal of the short edge (130).

6. A bottom-edge chip-dividing milling cutter according to claim 5, characterized in that: The bottom ends of the first chip removal groove (230) and the second chip removal groove (240) adjacent to the short edge (130) are cut through.

7. A bottom-edge chip-dividing milling cutter according to claim 5, characterized in that: The two side walls of the first chip groove (230) respectively form a first side edge (250) and a second side edge (260), the first side edge (250) is connected to the short edge (130), the second side edge (260) is connected to the long edge (120), the helix angle of the first side edge (250) is a first helix angle (270), the first helix angle (270) is 46°, the helix angle of the second side edge (260) is a second helix angle (280), the second helix angle (280) is 43°.

8. A bottom-edge chip-dividing milling cutter according to claim 7, characterized in that: At least one of the first side edge (250) and the second side edge (260) has a second front angle (290) located at the front side and a first back angle (300) located at the back side, the second front angle (290) is 4±1°, and the first back angle (300) is 10°.

9. A bottom-edge chip-dividing milling cutter according to claim 8, characterized in that: The angle between the front side of the second side blade (260) and the adjacent first side blade (250) is a third angle (310), and the third angle (310) is 85°. The angle between the rear side of the second side blade (260) and the adjacent first side blade (250) is a fourth angle (320), and the fourth angle (320) is 95°.

10. The bottom-edge chip-dividing milling cutter according to claim 1, characterized in that: The groove bottom of the spiral chip removal groove (140) is arc-shaped, and the core diameter (330) of the groove bottom of the spiral chip removal groove (140) is 0.6D.

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