Milling cutter structure

Abstract

The utility model belongs to the technical field of PCB manufacturing, and relates to a milling cutter structure. The milling cutter structure comprises a cutting edge main body and a main cutting edge spirally arranged on the cutting edge main body, wherein the main cutting edge is provided with a groove spirally formed in the cutting edge main body and a groove back formed between the groove and the cutting edge main body; the groove back forms an arc-shaped notch between the groove and the blade body, and the radial distance between the lowest point of the arc-shaped notch and the central axis of the blade body is smaller than the peripheral radius of the blade body. The milling cutter structure is better in sharpness, the effect of cutting a PCB (Printed Circuit Board) is better, and the board edge quality is favorably improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the PCB manufacturing technical field, especially, relate to a milling cutter structure. BACKGROUND

[0002] The existing PCB (Printed Circuit Board, printed circuit board) industry mainly adopts diamond type, broken chip groove thread or double right screw etc. The tooth pitch or cutting tooth height difference etc. in the milling cutter production process of above-mentioned cutter type, make the plate edge that drills appears burr and pit uneven condition, seriously reduce the plate edge quality. UTILITY MODEL CONTENTS

[0003] The utility model relates to a milling cutter structure that solves the technical problem that the existing milling cutter processing easily reduces the plate edge quality.

[0004] To solve the above technical problem, the utility model embodiment provides a milling cutter structure, including blade main part and single main cutting edge that spiral setting is in on the blade main part, the main cutting edge has the groove that spiral setting is in on the blade main part and the groove back that forms between the groove and the blade main part;

[0005] The groove back forms the arc notch between the groove and the blade main part, and the radial distance between the lowest point of the arc notch and the central axis of the blade main body is less than the outer radius of the blade main body.

[0006] According to the milling cutter structure of the utility model embodiment, the single main cutting edge is spiral set on the blade main body, and the radial distance between the lowest point of the arc notch and the central axis of the blade main body is less than the outer radius of the blade main body, so that the sharpness of the milling cutter structure is better, and the cutting effect of the PCB board is better, which is beneficial to improving the plate edge quality.

[0007] Optionally, the groove back is an arc surface, the outer radius r of the blade main body and the radial distance d1 between the central axis of the blade main body and the groove back satisfy: 1>r / d1>0.85.

[0008] Optionally, the maximum value d1max of the radial distance d1 between the outer radius r of the blade main body and the central axis of the blade main body and the groove back satisfies: 0.25mm>d1max-r>0.05mm.

[0009] Optionally, the outer radius of the blade main body is 0.4mm-2.0mm.

[0010] Optionally, the groove bottom forms a chip groove, and the chip groove is used for discharging the waste chip generated during the processing of the milling cutter structure.

[0011] Optionally, the chip flute is helical, and a helical direction of the chip flute is consistent with a helical direction of the main cutting edge.

[0012] Optionally, a helical angle of the main cutting edge is 15°-30°.

[0013] Optionally, the first end of the cutting edge body is provided with a first inclined surface and a second inclined surface connected with the first inclined surface, the first inclined surface is arranged in a first direction intersecting with an axial direction of the cutting edge body, the second inclined surface is arranged in a second direction intersecting with the axial direction of the cutting edge body, and the first direction intersects with the second direction.

[0014] When the milling cutter structure rotates, a fish tail groove in a conical shape is formed between the first inclined surface and the second inclined surface.

[0015] Optionally, the milling cutter structure further comprises a shank connected to the second end of the cutting edge body.

[0016] Optionally, the shank is integrally formed with the cutting edge body. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a schematic view of the milling cutter structure provided by an embodiment of the present application;

[0018] Figure 2 is a schematic view of the first end of the milling cutter structure provided by an embodiment of the present application;

[0019] Figure 3 is a schematic view of a cross section of the milling cutter structure provided by an embodiment of the present application.

[0020] Reference signs in the description are as follows:

[0021] 1, cutting edge body; 11, first inclined surface; 12, second inclined surface;

[0022] 2, main cutting edge; 21, groove; 22, groove back; 23, chip flute;

[0023] 3, shank. DETAILED DESCRIPTION

[0024] In order to make the technical problems, technical solutions and beneficial effects solved by the present application more clearly understood, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0025] For example, Figures 1 to 3The utility model discloses a milling cutter structure, including the cutting edge main part 1 and the single main cutting edge 2 of spiral setting on the cutting edge main part 1, and the main cutting edge 2 has the groove 21 of spiral setting in the cutting edge main part 1 and the groove back 22 formed between the groove 21 with the cutting edge main part 1.

[0026] The groove back 22 forms an arc-shaped notch between the groove 21 and the cutting edge main body 1, and the radial distance d2 between the lowest point of the arc-shaped notch and the central axis of the cutting edge main body 1 is less than the outer peripheral radius r of the cutting edge main body.

[0027] The utility model discloses a milling cutter structure, in the cutting edge main part 1 spiral setting single main cutting edge 2, and make the radial distance d2 between the lowest point of arc-shaped notch and the central axis of the cutting edge main body 1 less than the outer peripheral radius r of the cutting edge main body, to make the sharpness of milling cutter structure better, and then can make the effect of cutting PCB board better, be favorable to the quality of board edge promotion.

[0028] In an embodiment, as shown in Figure 3 The groove back 22 is an arc surface protruding from the cutting edge main body 1.

[0029] The outer peripheral radius r of the cutting edge main body 1 and the radial distance d1 between the central axis of the cutting edge main body 1 and the groove back 22 satisfy: 1 > r / d1 > 0.85.

[0030] By setting the ratio (i.e., core diameter ratio) between the outer peripheral radius r of the cutting edge main body 1 and the radial distance d1 between the central axis of the cutting edge main body 1 and the groove back 22 to be greater than or equal to 0.85, the outer peripheral radius of the cutting edge main body can occupy a larger proportion, thereby making the rigidity of the milling cutter structure better, which is conducive to improving the precision and reducing the occurrence of tool breakage.

[0031] In an embodiment, as shown in Figure 3 The maximum value d1max of the radial distance d1 between the outer peripheral radius r of the cutting edge main body 1 and the central axis of the cutting edge main body 1 and the groove back 22 satisfies: 0.25mm > d1max-r > 0.05mm. Preferably, the difference between the maximum value d1max of the radial distance d1 between the outer peripheral radius r of the cutting edge main body 1 and the central axis of the cutting edge main body 1 and the groove back 22 is 0.0765mm.

[0032] By setting the difference between the outer peripheral radius r of the cutting edge main body 1 and the maximum value d1max of the radial distance d1 between the central axis of the cutting edge main body 1 and the groove back 22 to be 0.0765mm, the rigidity of the milling cutter structure can be further improved, which is conducive to improving the precision and reducing the occurrence of tool breakage. Figure 3The blade difference d3 shown in the middle is set to 0.05mm-0.25mm, which can form an escape gap (the area where the blade difference d3 is located) between the blade body 1 and the main cutting edge 2, ensure that the blade body 1 does not touch the PCB during rotary cutting, reduce the friction between the blade body 1 and the PCB, effectively reduce the heat generated by friction, and at the same time avoid the secondary extrusion of the blade body 1 to the board, which can improve the surface quality of the board.

[0033] In an embodiment, as shown in Figure 3 , the outer radius of the blade body 1 is 0.4mm-2.0mm. Preferably, the outer radius of the blade body 1 is 0.4617mm.

[0034] By setting the outer radius of the blade body 1 to 0.4mm-2.0mm, the strength of the milling cutter structure is enhanced, and the dimensional stability and service life are improved.

[0035] In an embodiment, as shown in Figures 1 to 3 , the groove bottom of the groove 21 is formed with a chip removal groove 23 for removing the waste chips generated during processing.

[0036] In an embodiment, as shown in Figure 1 , the chip removal groove 23 is spiral, and the spiral direction of the chip removal groove 23 is consistent with the spiral direction of the main cutting edge 2.

[0037] By making the spiral direction of the chip removal groove 23 consistent with the spiral direction of the main cutting edge 2, it is more conducive to continuous chip removal.

[0038] In an embodiment, as shown in Figure 1 , the spiral angle of the main cutting edge 2 is 15°-30°. Preferably, the spiral angle of the main cutting edge 2 is 20°.

[0039] By setting the spiral angle of the blade body 1 to 15°-30°, the speed of chip removal is improved, and the control of the sharpness of the blade is facilitated.

[0040] The direction of the spiral angle can be left-handed or right-handed to meet different processing needs.

[0041] In an embodiment, as shown in Figure 1 and Figure 2 , the first end of the blade body 1 is provided with a first inclined surface 11 and a second inclined surface 12 connected with the first inclined surface 11, the first inclined surface 11 is inclinedly arranged along a first direction intersecting the axial direction of the blade body 1, the second inclined surface 12 is inclinedly arranged along a second direction intersecting the axial direction of the blade body 1, and the first direction intersects the second direction.

[0042] When the milling cutter structure rotates, a conical fishtail groove is formed between the first inclined surface 11 and the second inclined surface 12.

[0043] By designing the first end of the blade body 1, when the milling tool structure rotates, a fish tail groove in a conical shape is formed between the first inclined surface 11 and the second inclined surface 12, so that the cutting resistance can be reduced, the cutting process is more stable, and the cutting efficiency is improved.

[0044] In an embodiment, as shown in Figure 1 The milling tool structure further comprises a shank 3 connected to the second end of the blade body 1 to constitute the milling tool structure.

[0045] In an embodiment, as shown in Figure 1 The shank 3 is integrally formed with the blade body 1, so as to improve the overall rigidity of the milling tool structure.

[0046] The above is only a preferred embodiment of the present application, and is not intended to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A cutter construction comprising, The cutting edge body and the main cutting edge are helically arranged on the cutting edge body, the main cutting edge has a groove helically arranged on the cutting edge body and a groove back formed between the groove and the cutting edge body; The groove back forms an arc-shaped notch between the groove and the cutting edge body, and the lowest point of the arc-shaped notch has a radial distance from the central axis of the cutting edge body smaller than the outer radius of the cutting edge body.

2. The mill structure of claim 1, wherein The groove back is an arc surface, and the outer radius r of the cutting edge body and the radial distance d1 between the central axis of the cutting edge body and the groove back satisfy: 1>r / d1>0.

85.

3. The mill structure of claim 2, wherein, The maximum value d1max of the radial distance d1 between the central axis of the cutting edge body and the groove back satisfies: 0.25mm>d1max-r>0.05mm.

4. The mill structure of claim 1 wherein, The outer radius of the cutting edge body is 0.4mm-2.0mm.

5. The mill structure of claim 1 wherein, The groove bottom of the groove is formed with a chip removal groove for discharging the waste chips generated during the machining of the milling cutter structure.

6. The mill structure of claim 5 wherein, The chip removal groove is helical, and the helical direction of the chip removal groove is consistent with the helical direction of the main cutting edge.

7. The mill structure of claim 1 wherein, The helical angle of the main cutting edge is 15°-30°.

8. The mill structure of claim 1 wherein, The first end of the cutting edge body is provided with a first inclined surface and a second inclined surface connected with the first inclined surface, the first inclined surface is arranged in a first direction intersecting the axial direction of the cutting edge body, the second inclined surface is arranged in a second direction intersecting the axial direction of the cutting edge body, and the first direction intersects the second direction. When the milling cutter structure rotates, the first inclined surface and the second inclined surface form a tapered fish tail groove.

9. The mill structure of claim 1 wherein, The milling cutter structure further comprises a shank connected to the second end of the cutting edge body.

10. The mill structure of claim 9, wherein The shank and the cutting edge body are integrally formed.

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