A milling cutter

Abstract

The present invention discloses a milling cutter, which relates to the technical field of printed circuit board processing. The milling cutter includes a handle, a cutter body and a cutter head. The cutter body is provided with a plurality of spiral grooves, and a spiral ridge is formed between two adjacent grooves. The top of each ridge is set as a cutting edge. When the milling cutter is used to process the printed circuit board, the surface of the plate can be processed by the cutting edge at the cutter body to achieve the cutting process of the plate. In addition, a chip-splitting spiral groove is provided on the cutter body, and the chip-splitting spiral groove forms a plurality of chip-splitting grooves on the cutting edge. Along the length direction of the cutter body, at least one end of the chip-splitting spiral groove is spaced from the end of the cutting edge close to it, so as to avoid the cutting edge at the front end and / or rear end of the cutter body from being cut off during the chip-splitting groove processing process, thereby ensuring the integrity of the front end and / or rear end cutting edge, thereby suppressing the occurrence of problems such as burrs on the plate edge during the drilling process, and ensuring the processing quality of the plate after the milling cutter is cut.

Description

Technical Field

[0001] The invention relates to the technical field of printed circuit board processing, in particular to a milling cutter. Background Art

[0002] With the rapid development of the printed circuit board (PCB) industry, the processing quality of printed circuit boards has received more and more attention. At present, conventional diamond-toothed and chip-breaking milling cutters are usually used to process the appearance of printed circuit boards, such as Figure 1-2 As shown, the milling cutter is mainly composed of a handle 1', a cutter body 2' and a cutter head 3'. The workpiece is cut by a cutting edge 22' arranged on the cutter body 2', and the chips are discharged by a chip groove 4' arranged on the cutting edge 22'. However, in actual manufacturing, in order to ensure good chip removal performance, the entire cutter body 2' is usually provided with a chip groove 4', but the manufacturing of the chip groove 4' is easy to damage the cutting edge 22' on the cutter body 2', resulting in problems such as burrs at the bottom of the cutter and burrs on the edge of the board on the surface of the printed circuit board processed by the milling cutter.

[0003] Therefore, how to improve the existing milling cutter to overcome the above problems is an urgent problem to be solved by those skilled in the art. Summary of the invention

[0004] The purpose of the present invention is to provide a milling cutter, which can ensure the integrity of the cutter head and its cutting performance, and can also avoid problems such as burrs on the edge of the plate when performing shape processing, thereby improving the processing quality.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A milling cutter comprises a handle, a cutter body and a cutter head connected in sequence, wherein the cutter body is provided with a plurality of spiral grooves, a spiral ridge is formed between two adjacent grooves, and the top of each ridge is provided with a cutting edge;

[0007] The cutter body is provided with a chip-breaking spiral groove, and the chip-breaking spiral groove forms a plurality of chip-breaking grooves on the cutting edge. Along the length direction of the cutter body, at least one end of the chip-breaking spiral groove is spaced apart from the end of the cutting edge adjacent thereto.

[0008] Optionally, along the length direction of the cutter body, the chip-splitting spiral groove is spaced a first distance from an end of the cutting edge close to the cutter head.

[0009] Optionally, along the length direction of the tool body, the chip-splitting spiral groove is spaced a second distance from an end of the cutting edge close to the tool handle.

[0010] Optionally, the ratio of the length of the chip-splitting spiral groove to the total length of the cutter body is 30%-90%;

[0011] The ratio of the first distance to the total length of the blade body is 10%-50%;

[0012] The ratio of the second distance to the total length of the blade body is 0%-60%.

[0013] Optionally, at least one of the cutting edges extends to the tip of the tool head to form a sharpened point, and the inner side of the sharpened point is not lower than the bottom of the groove.

[0014] Optionally, the sharpening angle α of the sharpening is 0°-10°.

[0015] Optionally, the helix angle β of the groove is 10°-45°;

[0016] The helical angle γ of the chip-dividing spiral groove is 20°-89°.

[0017] Optionally, the hand direction of the chip-splitting spiral groove is opposite to that of the groove, and the bottom of the chip-splitting spiral groove is not lower than the bottom of the groove.

[0018] Optionally, the grooves and the chip-dividing spiral grooves are evenly distributed with the axis of the tool body as the center.

[0019] Optionally, a flat section is provided at the bottom of the groove, and the distances from each point on the flat section to the milling cutter center are equal.

[0020] The beneficial effects of the present invention are:

[0021] The present invention provides a milling cutter, which includes a handle, a cutter body and a cutter head. The cutter body is provided with a plurality of spiral grooves, and a spiral ridge is formed between two adjacent grooves. The top of each ridge is set as a cutting edge. When the milling cutter is used to process a printed circuit board, the surface of a plate can be processed by the cutting edge at the cutter body to achieve cutting processing of the plate. In addition, a chip-splitting spiral groove is provided on the cutting edge, and the chip-splitting spiral groove forms a plurality of chip-splitting grooves on the cutting edge. Along the length direction of the cutter body, at least one end of the chip-splitting spiral groove is spaced apart from the end of the cutting edge close to it. The cutter body is provided with a chip-splitting spiral groove so that the chips in the cutting process are discharged through the chip-splitting groove. Since at least one end of the chip-splitting spiral groove is spaced apart from the end of the cutting edge close to it, the cutting edge at the front end and / or the rear end of the cutter body is prevented from being cut off during the chip-splitting groove processing process, thereby ensuring the integrity of the cutting edge at the front end and / or the rear end, thereby suppressing the occurrence of problems such as burrs on the plate edge during the drilling process, and ensuring the processing quality of the plate after the milling cutter is cut. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1It is a structural schematic diagram of a milling cutter in the prior art;

[0023] Figure 2 It is a schematic diagram of a part of the structure of a milling cutter at another angle in the prior art;

[0024] Figure 3 is a schematic structural diagram of a milling cutter in an embodiment of the present invention;

[0025] Figure 4 is a schematic structural diagram of a milling cutter from another angle in an embodiment of the present invention;

[0026] Figure 5 yes Figure 3 Cross-sectional view along AA direction;

[0027] Figure 6 It is a front view of the cutter head in the embodiment of the present invention.

[0028] In the figure:

[0029] 1', tool handle; 2', tool body; 3', tool head; 4', chip groove; 22', cutting edge;

[0030] 1. Knife handle; 2. Knife body; 3. Knife head;

[0031] 21. Groove; 22. Cutting edge; 23. Chip-dividing spiral groove; 31. Sharpening. DETAILED DESCRIPTION

[0032] In order to make the technical problem solved by the present invention, the technical solution adopted and the technical effect achieved more clearly, the technical solution of the present invention is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0033] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. 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] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0035] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0036] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0037] This embodiment provides a milling cutter such as Figure 3-6 As shown, the milling cutter includes a handle 1, a cutter body 2 and a cutter head 3. The cutter body 2 is provided with a plurality of spiral grooves 21, and a spiral ridge is formed between two adjacent grooves 21. The top of each ridge is provided with a cutting edge 22, and the cutting edge 22 can realize the cutting of the printed circuit board. The cutter body 2 is provided with a chip-splitting spiral groove 23, and the chip-splitting spiral groove 23 forms a plurality of chip-splitting grooves on each cutting edge 22. The chip-splitting grooves can realize the cutting and discharge of the chips, and avoid the chips being too long and being rolled into the cutter head 3 or the cutting edge 22 to affect the cutting performance of the milling cutter, and avoid the situation that the milling cutter is blocked due to the cutting rolling, thereby improving the cutting effect of the milling cutter.

[0038] In the prior art, the entire cutter body 2' is usually provided with a chip dividing groove 4'. Figure 1-2 However, the manufacturing of the chip dividing groove 4' is prone to damage the cutting edges 22' at the front and rear ends of the cutter body 2', resulting in problems such as burrs at the lower cutting point and burrs at the edge of the printed circuit board after the cutting process by the cutting edge 22'.

[0039] To solve the above problems, Figure 3-4As shown, the milling cutter proposed in this embodiment is provided with a chip-splitting spiral groove 23 at least at one end thereof spaced from the end of the cutting edge 22 close thereto along the length direction of the cutter body 2. That is, the cutting edge 22 at at least one end is not provided with a chip-splitting spiral groove 23, so as to avoid the cutting edge 22 at the front end and / or the rear end of the cutter body 2 being cut off during the processing of the chip-splitting spiral groove 23, thereby ensuring the integrity of the front end and / or the rear end cutting edge 22, so that when the milling cutter is used for cutting of printed circuit boards, problems such as burrs on the upper and / or lower surfaces after processing can be suppressed, thereby ensuring the processing quality of the board after the milling cutter is cut.

[0040] Specifically, along the length direction of the cutter body 2, the chip-splitting spiral groove 23 is spaced a first distance from one end of the cutting edge 22 close to the cutter head 3. By controlling the distance between the chip-splitting spiral groove 23 and the front end of the cutting edge 22, the front cutting edge 22 and the cutter head 3 are prevented from being partially cut off during the processing of the chip-splitting spiral groove 23, thereby ensuring the integrity of the front main cutting edge 22 of the cutter body 2 and its cutting performance, and also ensuring the integrity of the cutter head 3, thereby suppressing the problems of milling cutter drilling burrs during the drilling process, improving the quality of the board edge of the board cut by the front of the cutter body 2 during the shape processing of the printed circuit board, and ensuring the cutting performance of the cutter head 3, thereby improving the processing effect of the milling cutter.

[0041] Furthermore, along the length direction of the cutter body 2, the chip-splitting spiral groove 23 is spaced a second distance from the end of the cutting edge 22 close to the handle 1. Similar to the case where the chip-splitting spiral groove 23 is not provided at the front of the cutter body 2, since the chip-splitting spiral groove 23 does not extend to the cutting edge 22 at the rear of the cutter body 2, the rear cutting edge 22 is prevented from being partially cut off during the processing of the chip-splitting spiral groove 23, thereby ensuring the integrity of the main cutting edge 22 at the rear of the cutter body 2 and its cutting performance, thereby suppressing the problems of milling cutter drilling burrs and the like during the drilling process, and improving the board edge quality of the board cut by the rear of the cutter body 2 during the processing of the shape of the printed circuit board.

[0042] Optionally, the ratio of the length of the chip-splitting spiral groove 23 to the total length of the cutter body 2 is 30%-90%, the ratio of the first distance to the total length of the cutter body 2 is 10%-50%, and the ratio of the second distance to the total length of the cutter body 2 is 0%-60%. That is, in the design and manufacturing process of the milling cutter, the length of the cutter body 2 and the length ratio of the chip-splitting spiral groove 23 set on the cutter body 2 can be set according to the length of the required milling plate, that is, the upper and lower ends of the chip-splitting spiral groove 23 do not exceed the upper and lower ends of the cutter plate, so as to ensure the processing quality of the uppermost and lowermost edges of the plate and improve the appearance flatness of the plate surface. In addition, the processing position of the chip-splitting spiral groove 23 can be reasonably selected according to the shape of the required milling plate and its actual processing conditions, and the chip-splitting spiral groove 23 can also be set in sections on the cutting edge 22 to facilitate more efficient cutting of the plate. Its specific setting form can be selected according to actual conditions and is not specifically limited here.

[0043] Preferably, in this embodiment, the first distance accounts for 15% of the length of the cutter body 2 , the length of the chip-splitting spiral groove 23 accounts for 50% of the length of the cutter body 2 , and the second distance accounts for 35% of the length of the cutter body 2 . The specific working principle of the milling cutter is as follows: the milling cutter rotates at high speed during operation, and the cutting edge 22 arranged on the cutter body 2 continuously cuts off the plate material of the printed circuit board. Since the milling cutter and the plate cutting part are provided with a chip-dividing spiral groove 23 during operation, the chips will be stored in the chip-dividing groove during the cutting process and will be thrown out of the chip-dividing groove due to inertia and gravity. Since the chip-dividing spiral groove 23 accounts for 50% of the cutter body 2, it is sufficient to ensure smooth chip removal during the processing process and avoid the phenomenon of poor excretion caused by heat during the processing process. At the same time, since the upper and lower ends of the chip-dividing spiral groove 23 have 35% and 15% respectively, it can be ensured that they do not exceed the upper and lower ends of the cut plate material. The integrity of the cutting edges 22 at the upper and lower ends can be used to improve the processing quality of the uppermost and lowermost board edges, avoid processing burrs on the processing surface, and improve the processing quality of the printed circuit board.

[0044] Since the chip-dividing spiral groove 23 is only partially provided on the cutter body 2 of the milling cutter, in order to ensure the chip removal performance under the premise of reducing the chip-dividing groove, a flat section can be provided at the bottom of the groove 21, and the distance from each point on the flat section to the axis of the milling cutter is equal. By setting the flat section to increase the spacing distance between the teeth, the chip removal space of the milling cutter is increased, and the chip discharge is smoother. In addition, the setting of the flat section also increases the spacing between the teeth, so that the front angle of the cutting edge 22 can be set larger to increase the sharpness of the chip cutting edge 22. At the same time, since the bottom of the groove 21 is smoothed by the flat section, the distance from each point on the flat section to the axis of the milling cutter is equal. Therefore, under the condition of the same number of cutting edges 22, the processing depth of the groove 21 can be reduced, the core diameter of the milling cutter is increased, and the tool breakage rate is reduced. The length of the flat section can be designed according to the actual use scenario of the milling cutter. It is worth noting that the flat section should not be set too large to make the cutting edge 22 too few. Preferably, the arc of each flattening section at both ends from the axis of the milling cutter is set to 15°-30°. Within this range, the chip removal space of the chip dividing spiral groove 23 can be increased by 25%-40%, thereby achieving better chip removal performance.

[0045] To ensure the cutting performance at the cutter head 3, Figure 3-5 As shown, at least one chip cutting edge 22 extends to the tip of the cutter head 3 to form a sharpened tip 31, and the inner side of the sharpened tip 31 is not lower than the bottom of the groove 21. By forming the sharpened tip 31 at the tip of the milling cutter head 3, it is ensured that when the milling cutter is used for drilling and cutting, at least one complete cutting edge 22 is retained at the front end of the milling cutter tip for easy cutting. At the same time, compared with the milling cutter in the prior art, such as Figure 2As shown, since the chip groove 4' in the prior art extends to the cutter head 3', the cutter head 3' is easily damaged due to the processing of the chip groove 4', thereby reducing the cutting performance and self-strength of the cutter head 3'. In this embodiment, on the one hand, the chip spiral groove 23 is not provided at the cutter head 3, which ensures the integrity of the cutting edge 22 at the cutter head 3 and suppresses the quality problems such as burrs when the cutter head 3 is drilled. On the other hand, since the tip of the cutter head 3 is provided with a sharpening 31, it is easier to drill and cut through the sharpening 31, thereby ensuring the cutting performance of the milling cutter. In this embodiment, the sharpening 31 is provided in two and is symmetrically arranged along the central axis of the milling cutter, which ensures the balance of the milling cutter during drilling and improves the milling effect.

[0046] To further ensure the cutting effect of the cutter head 3, Figure 6 As shown, the sharpening angle α of the sharpening tip 31 is 0°-10°. The sharpening angle α is the acute angle between the first side and the second side, wherein the projection of the outline formed by the first side and the sharpening tip 31 in the front view coincides, the second side is the line connecting the tip of the sharpening tip 31 and the intersection of the first side and the vertical line passing through the center of the cutter head 3, and the first side and the second side are on the same side of the central symmetrical sharpening. On the one hand, the sharpening angle α is greater than 0°, which ensures that the tip of the sharpening tip 31 is located on the right side of the first side, so as to facilitate the control of the cutting performance of the milling cutter. On the other hand, by limiting the sharpening angle α, the sharpness of the sharpening tip 31 can be ensured, and the cutting force of the cutter head 3 can be improved. Moreover, since a flat section is provided at the bottom of the groove 21, the problem of insufficient strength of the sharpening tip 31 caused by the sharpening tip 31 being set too small can be solved by increasing the thickness of the cutting edge 22. Optionally, the angle α can be 1°, 2°, 3°, 4°, 5°, 6°, 7°, 8°, 9°, 10°. Since the milling cutter proposed in this embodiment is mainly used for milling printed circuit boards, its hardness value is relatively small, so it can be set to a relatively small angle α to ensure the sharpness of the milling cutter tip 31 to better realize the processing of the circuit board. Preferably, the angle α between the outer side of the tip 31 and the edge line of the end of the cutter head 3 is 0°. This angle makes the cross-section of the tip 31 have an arc-shaped knife shape with a low middle and high ends. Its shape ensures the sharpness of the tip 31 and improves the cutting effect.

[0047] In this embodiment, the direction of rotation of the chip-dividing spiral groove 23 of the milling cutter is opposite to that of the groove 21, and the bottom of the chip-dividing spiral groove 23 is not lower than the bottom of the groove 21. When the right-edge left-spiral and left-edge right-spiral milling cutters are used for through-hole machining or finishing, the chips are discharged toward the end face of the milling cutter, which is not easy to damage the surface of the plate, and avoids scratches or machining burrs on the surface of the plate.

[0048] Preferably, the groove 21 and the chip-dividing spiral groove 23 are evenly distributed around the axis of the cutter body 2, which can further improve the cutting stability of the milling cutter and ensure the chip cutting effect.

[0049] In this embodiment, Figure 3 As shown, the helix angle β of the groove 21 is 10°-45°, which is the angle between the helix tangent of a point on the groove 21 and the straight generatrix of the milling cutter passing through the point. Since the degree of tool wear is proportional to the size of the helix angle β, but the rigidity of the cutting edge 22 deteriorates when the helix angle β is too small, it is not conducive to the cutting of the plate. Therefore, the helix angle β in the angle range of 10°-45° has appropriate cutting performance and processing accuracy, and is suitable for cutting printed circuit boards. Optionally, the helix angle β of the groove 21 is 30°±2°, and the milling cutter at this angle has better chip removal performance, and the cutting surface is smooth, with better processing quality.

[0050] Furthermore, the helical angle γ of the chip-splitting spiral groove 23 is 20°-89°. The selection of the helical angle γ ensures that there is at least one complete cutting edge 22 on any cross section of the milling cutter body 2, and the helical angle γ in this range also ensures sufficient chip removal capacity. Optionally, the helical angle γ of the chip-splitting spiral groove 23 is 40°±2°, and the milling cutter formed by the helical angle γ and the helical angle β of the groove 21 has good cutting ability and can meet the processing needs of printed circuit boards.

[0051] It is worth noting that the above specific numerical values ​​can be selected within an appropriate range according to actual conditions and are not specifically limited here.

[0052] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The content of this specification should not be understood as limiting the present invention.

Claims

1. A milling cutter, comprising a cutter handle (1), a cutter body (2) and a cutter head (3) connected in sequence, characterized in that: The blade body (2) is provided with a plurality of spiral grooves (21), a spiral ridge is formed between two adjacent grooves (21), and the top of each ridge is provided as a cutting edge (22); The cutter body (2) is provided with a chip-splitting spiral groove (23), and the chip-splitting spiral groove (23) forms a plurality of chip-splitting grooves on the cutting edge (22). Along the length direction of the cutter body (2), at least one end of the chip-splitting spiral groove (23) is spaced apart from the end of the cutting edge (22) adjacent thereto, and at least one end of the cutting edge (22) is not provided with the chip-splitting spiral groove (23); at least one cutting edge (22) extends to the tip of the cutter head (3) to form a sharpened tip (31), and the inner side of the sharpened tip (31) is not lower than the bottom of the groove (21); A flat section is provided at the bottom of the groove (21), and the distances from each point on the flat section to the center of the milling cutter are equal; Along the length direction of the cutter body (2), the chip-dividing spiral groove (23) is spaced a first distance from an end of the cutting edge (22) close to the cutter head (3).

2. The milling cutter according to claim 1, characterized in that Along the length direction of the tool body (2), the chip-dividing spiral groove (23) is spaced a second distance from an end of the cutting edge (22) close to the tool handle (1).

3. The milling cutter according to claim 2, characterized in that: The ratio of the length of the chip-splitting spiral groove (23) to the total length of the cutter body (2) is 30%-90%; The ratio of the first distance to the total length of the blade body (2) is 10%-50%; The ratio of the second distance to the total length of the blade body (2) is 0%-60%.

4. The milling cutter according to claim 1, characterized in that The sharpening angle α of the sharpening (31) is 0°-10°.

5. The milling cutter according to any one of claims 1 to 3, characterized in that: The helix angle β of the groove (21) is 10°-45°; The helical angle γ of the chip-dividing spiral groove (23) is 20°-89°.

6. The milling cutter according to any one of claims 1 to 3, characterized in that: The rotation direction of the chip-splitting spiral groove (23) is opposite to that of the groove (21), and the bottom of the chip-splitting spiral groove (23) is not lower than the bottom of the groove (21).

7. The milling cutter according to claim 6, characterized in that The groove (21) and the chip-dividing spiral groove (23) are evenly distributed with the axis of the cutter body (2) as the center.

Images