Cutter, using method and machining device

Abstract

The invention discloses a cutter, a using method and a machining device. The cutter comprises a cutting part, a tip part, a guide groove and a cutting groove, and the cutting part comprises a cutting edge and an edge petal; the tip part is formed on the outer end surface of the cutting part and is arranged in an inward concave obtuse angle; the guide groove is formed in the circumferential edge of the outer end face of the cutting part, is adjacent to the blade and is used for guiding the cutting part to cut into the through hole; the multiple cutting grooves are formed in the cutting edges respectively, and the cutting grooves are formed in the axial direction at intervals and have downward cutting angles. The cutter can be designed and adjusted according to the broken shape and size of the NPTH in the special-shaped groove, the cutter can be better cut into the through hole through the guide groove, the cutting edge of the cutter has certain cutting capacity through the design of the tip part and the cutting groove, and the cutter only performs vertical punching action along the axis of the cutter during use, so that the cutting efficiency is greatly improved. Therefore, a good hole shape effect is achieved, the problem of hole deviation is solved as much as possible, and the machining efficiency can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of cutting tools, and in particular to a cutting tool, a use method and a processing device. Background Art

[0002] As the requirements for signal transmission become higher and higher, the anti-interference and shielding capabilities of signals in PCB (printed circuit board) design are also required to be higher and higher. The PCB design used for high-speed transmission, which adds auxiliary copper to the upper and lower layers of the signal line to resist the upper and lower layer signal crosstalk, can no longer meet the signal requirements. Now the terminal customers have put forward the processing requirements of special-shaped slots for communication thick boards. By reprocessing the PTH holes (metallized holes), NPTH (non-metallized holes) with disconnected centers are formed, so as to achieve the effect of signal shielding.

[0003] The special-shaped groove processing method in the related art is usually carried out by drilling the groove with a drill bit, and the special-shaped groove for shielding signals is often used in communication thick plates with a thickness of 2 to 9 mm. The width of the NPTH disconnection is generally less than 0.3 mm. Therefore, when using a conventional groove cutter to drill the groove, the required groove drill diameter is small and the aspect ratio is relatively large, and the requirements for the groove cutter are high. When drilling the groove, the groove produced will have a serious skew hole problem due to the insufficient rigidity of the groove cutter and uneven force, and the NPTH disconnection effect cannot be achieved. Summary of the invention

[0004] The purpose of the present application is to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a tool that can well solve the problem of offset holes and improve processing efficiency.

[0005] The present application also provides a method for using the above-mentioned cutting tool.

[0006] The present application also proposes a processing device comprising the above-mentioned tool.

[0007] The cutting tool according to the first embodiment of the present application includes:

[0008] A cutting portion, including a cutting edge and a cutting edge;

[0009] A tip portion is formed on the outer end surface of the cutting portion and is arranged at an obtuse angle concave inwards;

[0010] A guide groove is formed on the circumferential edge of the outer end surface of the cutting portion and is arranged adjacent to the blade, the guide groove is used to guide the cutting portion to cut into the through hole;

[0011] A plurality of cutting grooves are respectively formed on each of the cutting edges. Each of the cutting grooves on each of the cutting edges is arranged at intervals along the axial direction of the cutting portion and has a preset downward cutting angle.

[0012] The tool according to the first aspect embodiment of the present application has at least the following beneficial effects: the tool can be designed and adjusted according to the shape and size of the NPTH disconnection in the special-shaped groove, and the guide groove is grinded according to the shape of the special-shaped groove so that the tool can better cut into the through hole, and the design of the tip and the cutting groove is used to make the tool blade have a certain cutting ability. When in use, the tool only performs up and down punching actions along the axis of the tool, that is, it can cut the material well, thereby having a good hole shape effect, so as to solve the problem of biased holes as much as possible and improve processing efficiency.

[0013] According to the tool described in the embodiment of the first aspect of the present application, the angle γ1 between the cutting surface of the tip and the tool cross section is the tool tip cutting front angle, and the γ1 is 0 to 40°.

[0014] According to the tool described in the first aspect embodiment of the present application, the cutting groove is formed with a concave arc surface as a front cutting surface, and the angle γ2 between the arc surface and the tool cross section is the outer edge punching front angle, and the γ2 is 0 to 20°.

[0015] According to the tool described in the embodiment of the first aspect of the present application, at least two first spiral grooves are opened in the guide groove, and the blade is formed on the outer edge conical surface of the guide groove.

[0016] According to the tool described in the embodiment of the first aspect of the present application, the guide groove has a helix angle β1, and β1 is 0°.

[0017] According to the tool described in the embodiment of the first aspect of the present application, the guide groove is configured as a structure with a bulge in the middle; or the guide groove is configured as a flat structure.

[0018] According to the tool described in the embodiment of the first aspect of the present application, 1 to 4 second spiral grooves are opened in the cutting groove, and the cutting groove has a helix angle β2, and β2 is (50°, 90°)∪(-50°, -90°).

[0019] According to the tool described in the embodiment of the first aspect of the present application, the taper α of the cutting edge is the cutting back angle, and α is 0 to 10°.

[0020] The method for using a cutting tool according to the second embodiment of the present application comprises the following steps:

[0021] The spindle of the equipment clamps the tool holder, sets the speed to zero, finds the PTH through hole position and punches downwards;

[0022] According to the thickness of the sheet material being processed, the punching is carried out in steps, and the feed depth of each step of the punching can be evenly divided according to the thickness of the sheet material.

[0023] The processing device according to the embodiment of the third aspect of the present application includes: the cutting tool as described in the embodiment of the first aspect of the present application.

[0024] It is not difficult to understand that the method of using the tool in the second aspect embodiment of the present application and the processing device in the third aspect embodiment of the present application both have the technical effects of the tool in the first aspect embodiment described above, and therefore will not be elaborated upon.

[0025] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present application is further described below with reference to the accompanying drawings and embodiments;

[0027] Figure 1 This is a schematic diagram of the structure of the first direction in the embodiment of the present application;

[0028] Figure 2 for Figure 1 sectional view of;

[0029] Figure 3 This is a schematic diagram of the structure of the second direction in the embodiment of the present application;

[0030] Figure 4 This is a geometric diagram of the cutting part and the supporting part in the embodiment of the present application;

[0031] Figure 5 for Figure 4 sectional view of;

[0032] Figure 6 Schematic diagrams of guide grooves in embodiments of the present application, wherein (a) is a schematic diagram of a structure in which the guide groove is configured as a bulge in the middle, and (b) is a schematic diagram of a structure in which the guide groove is configured as a flat shape;

[0033] Figure 7 This is a schematic diagram used in the embodiments of the present application;

[0034] Figure 8 Schematic diagram of a PTH hole to be processed in an embodiment of the present application.

[0035] Reference numerals:

[0036] 100, cutting portion; 110, cutting edge; 120, blade; 130, tip; 140, guide groove; 150, cutting groove;

[0037] 200, support part;

[0038] 300, PTH hole; 310, NPTH disconnected. DETAILED DESCRIPTION

[0039] The embodiments of the present application 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 application, and cannot be understood as limiting the present application.

[0040] In the description of the present application, 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 application 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 should not be understood as a limitation on the present application.

[0041] In the description of this application, "several" means one or more, "more" means at least 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 technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0042] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application after combining the specific content of the technical solution.

[0043] Reference Figures 1 to 8 The tool of the first embodiment of the present application is used to reprocess the PTH hole 300 to form a NPTH special-shaped hole with a center disconnection so as to achieve the function of signal shielding. The tool includes a cutting portion 100, a tip portion 130, a guide groove 140 and a cutting groove 150.

[0044] The cutting portion 100 includes a cutting edge 110 and a blade flap 120; a tip 130 is formed on the outer end surface of the cutting portion 100 and is arranged at an obtuse angle concave inward; a guide groove 140 is formed on the circumferential edge of the outer end surface of the cutting portion 100 and is arranged adjacent to the blade flap 120, and the guide groove 140 is used to guide the cutting portion 100 to cut into the through hole; a plurality of cutting grooves 150 are respectively formed on each cutting edge 110, and each cutting groove 150 on each cutting edge 110 is arranged at intervals along the axial direction of the cutting portion 100 and has a preset downward cutting angle.

[0045] It is understandable that the tool can be designed and adjusted according to the shape and size of the NPTH disconnection 310 in the special-shaped groove. The guide groove 140 is grinded according to the shape of the special-shaped groove so that the tool can better cut into the through hole, and the design of the tip 130 and the cutting groove 150 is used to make the tool blade have a certain cutting ability. When in use, the tool only performs up and down punching actions along the axis of the tool, that is, the material can be well cut off, thereby having a good hole shape effect, so as to solve the problem of biased holes as much as possible and improve processing efficiency.

[0046] In some embodiments, the tool mainly includes two parts: a cutting part 100 and a supporting part 200. The cutting part 100 has a sharp cutting edge 110, which can play a role in cutting off the material during punching, while the supporting part 200 is an ungrooved cylinder, which plays a role in supporting the cutting part 100. The cutting part 100 mainly includes three parts: a guide groove 140, a cutting groove 150 and a tip 130. The guide groove 140 is machined according to the shape of the special-shaped groove so that the tool can better cut into the through hole; the cutting groove 150 is machined on the blade 120 of the guide groove 140 to form a downward cutting angle; the tip 130 is ground by a grinding wheel to form two surfaces with an angle σ, so as to form a chip removal structure at the end and facilitate the punching action.

[0047] In some embodiments, the support portion 200 has a diameter of Not larger than the diameter of the PTH through hole The sum of its length L2 and the length L1 of the cutting part 100 must be greater than the thickness of the sheet material being processed to ensure that the through hole is completely disconnected during punching. Usually, in order to ensure the overall rigidity of the tool, the length L2 of the support part 200 is generally greater than 1 mm, and the length L1 of the cutting part 100 is generally 1 to 2 mm.

[0048] In some embodiments of the present application, the included angle γ1 between the cutting surface of the tip 130 and the tool cross section is the tool tip punching front angle, and γ1 is 0-40°. It can be understood that the included angle γ1 between the cutting surface of the tip 130 and the tool cross section is the tool tip punching front angle, and generally 0-40° can meet the effect of punching NPTH disconnection 310.

[0049] In some embodiments of the present application, the cutting groove 150 is formed with an inwardly concave cambered surface as the front cutting surface, and the angle γ2 between the cambered surface and the tool cross section is the outer edge punching front angle, and γ2 is 0 to 20°. It can be understood that when the cutting groove 150 is ground, a concave cambered surface is formed on the left side of the cutting groove 150, which is the front cutting surface of the punching, and the angle γ2 between the cambered surface and the cross section is the outer edge punching front angle. Usually, when the γ2 front angle is 0 to 20°, the effect of punching NPTH disconnection 310 can be satisfied.

[0050] In some embodiments of the present application, at least two first spiral grooves are formed in the guide groove 140, and the blade 120 is formed on the outer conical surface of the guide groove 140. It can be understood that in this embodiment, the guide groove 140 has two spiral grooves, and a conical surface of a certain width is left on the outer edge, that is, the blade 120, and its width B R The width B of the NPTH break 310 is kept consistent to ensure the size of the NPTH break 310 during punching.

[0051] In some embodiments of the present application, the guide groove 140 has a helical angle β1, and β1 is 0°. It can be understood that the helical angle β1 of 0° can ensure that the position of the NPTH disconnection 310 is consistent during punching.

[0052] In some embodiments of the present application, the guide groove 140 is configured as a structure with a bulge in the middle; or the guide groove 140 is configured as a flat structure. It is understandable that the guide groove 140 has two shapes that can be adaptively selected for use: when the guide groove 140 is bulging in the middle, the overall rigidity of the tool can be effectively improved and the tool breakage can be reduced; when the guide groove 140 is flat, the chip removal and cutting performance can be improved.

[0053] In some embodiments of the present application, the cutting groove 150 has 1 to 4 second spiral grooves, and the cutting groove 150 has a spiral angle β2, and β2 is (50°, 90°)∪(-50°, -90°). It can be understood that the cutting groove 150 generally has 1 to 4 spiral grooves, and the spiral angle value of each spiral groove satisfies the range of (50°, 90°)∪(-50°, -90°), so that the waste chips can be discharged in time during the punching process, and the tip 130 at the end makes the tool cutting performance of the tool itself better.

[0054] In some embodiments, the cutting groove 150 may be in the shape of a U-shaped groove or a V-shaped groove.

[0055] In some embodiments of the present application, the taper α of the blade 120 is the cutting back angle, and α is 0-10°. It can be understood that the diameter of the blade 120 of the cutting portion 100 is It has a taper. Generally, the taper α(arctg(Δd / L1) is 0-10°. This angle is also the cutting back angle α when the tool punches downward.

[0056] In some embodiments, in order to reduce cutting resistance, the diameter d of the blade back is R Need to be smaller than the PTH through hole diameter The height H of the blade 120 R Generally less than 0.1mm.

[0057] In some embodiments, the tool has two cutting edges 110 to achieve the processing of the NPTH disconnection 310 in the PTH hole 300. In other embodiments, it can be extended to 3-4 cutting edges 110 and applied to signal shielding of multi-line intersections.

[0058] Reference Figures 1 to 8 The method for using a tool in the second embodiment of the present application may be the method for using a tool in the first embodiment of the present application, and the method for using a tool comprises the following steps:

[0059] The spindle of the equipment clamps the tool holder, sets the speed to zero, finds the PTH through hole position and punches downwards;

[0060] According to the thickness of the sheet material being processed, the punching is carried out in steps, and the feed depth of each step of the punching can be evenly divided according to the thickness of the sheet material.

[0061] It can be understood that the tool and corresponding processing method proposed in this application are a new way to process special-shaped slots in the industry. Compared with the conventional slotting tool drilling method, it can effectively reduce the risk of slot deformation or offset holes and greatly improve the processing efficiency.

[0062] In some embodiments, when in use, the spindle of the device clamps the tool handle, and the speed is set to zero, that is, the spindle does not rotate, and the PTH through hole position is found and punched downward. According to the thickness of the processed sheet, the punching can be performed in steps. Usually, when the sheet thickness is 2 to 3 mm, it is divided into 2 steps, when the sheet thickness is 3 to 4 mm, it is divided into 3 steps, when the sheet thickness is 4 to 5 mm, it is divided into 4 steps, and so on. The depth of each step of punching feed can be evenly divided according to the thickness of the sheet.

[0063] Reference Figure 8With the rapid development of the electronic information age, the requirements for signal transmission are getting higher and higher, and the anti-interference and shielding capabilities of signals in PCB design are also required to be higher and higher. The PCB design used for high-speed transmission adds auxiliary copper to the upper and lower layers of the signal line to resist the upper and lower layer signal crosstalk, which can no longer meet the signal requirements. The terminal customers now require the processing of 0.30-0.50mm special-shaped grooves in communication thick boards (generally referring to a single piece with a thickness of 2mm-9mm). By reprocessing the PTH hole 300, a NPTH special-shaped hole with a disconnected center is formed, thereby achieving the effect of signal shielding. For this reason, a new tool and processing method are now needed to solve the problem of biased holes and improve processing efficiency. The current method of processing special-shaped grooves is usually to use a drill to drill the grooves, and the special-shaped grooves for shielding signals are often used in communication thick plates with a thickness of 2 to 9 mm. The width of the NPTH disconnection 310 is generally less than 0.3 mm. Therefore, when using a conventional slot cutter to drill the grooves, the required slot drill diameter is small and the length-diameter ratio is relatively large, and the requirements for the slot cutter are high. When drilling the grooves, the slots will have serious skew holes due to insufficient rigidity of the slot cutter and uneven force, and the effect of the NPTH disconnection 310 cannot be achieved. In this regard, the present application has developed a tool that can be used for punching by innovating the tool structure. The tool can be designed and adjusted according to the shape and size of the NPTH disconnection 310 in the special-shaped groove. When in use, the tool only performs up and down punching actions along the axis of the tool. Since the tool blade has a certain cutting ability, it can well cut the material, thereby achieving a good hole shape effect.

[0064] In some embodiments, a blade 120 with a diameter of 0.40 mm is used to punch a 0.35 mm through hole of a 3.5 mm thick communication board, and the disconnection width is 0.020 mm, thereby meeting the conditions for solving the problem of offset holes and improving processing efficiency.

[0065] Reference Figures 1 to 8 The processing device of the third aspect embodiment of the present application may be a punching processing device. The processing device includes a tool of the first aspect embodiment of the present application, which can be applied to the processing of the NPTH disconnection 310 in the PTH hole 300, and can effectively reduce the risk of slot deformation or offset hole, and greatly improve the processing efficiency.

[0066] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0067] The embodiments of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present application.

Claims

1. A cutting tool, characterized in that: include: A cutting portion, including a cutting edge and a cutting edge; A tip portion is formed on the outer end surface of the cutting portion and is arranged at an obtuse angle concave inwards; A guide groove is formed on the circumferential edge of the outer end surface of the cutting portion and is arranged adjacent to the blade, the guide groove is used to guide the cutting portion to cut into the through hole; A plurality of cutting grooves are respectively formed on each of the cutting edges. Each of the cutting grooves on each of the cutting edges is arranged at intervals along the axial direction of the cutting portion and has a preset downward cutting angle.

2. The tool according to claim 1, characterized in that: The included angle γ1 between the cutting surface of the tip and the cross section of the tool is the tool tip punching front angle, and the γ1 is 0-40°.

3. The tool according to claim 1, characterized in that: The cutting groove is formed with an inwardly concave arc surface as a rake face, and an angle γ2 between the arc surface and the tool cross section is an outer edge punching front angle, and the γ2 is 0-20°.

4. The cutting tool according to claim 1, characterized in that: At least two first spiral grooves are formed in the guide groove, and the blade is formed on the outer conical surface of the guide groove.

5. The tool according to claim 4, characterized in that: The guide groove has a helix angle β1, and β1 is 0°.

6. The tool according to claim 4, characterized in that: The guide groove is configured as a structure with a bulge in the middle; or the guide groove is configured as a flat structure.

7. The cutting tool according to claim 1, characterized in that: One to four second spiral grooves are formed in the cutting groove, and the cutting groove has a spiral angle β2, wherein β2 is (50°, 90°)∪(-50°, -90°).

8. The cutting tool according to claim 1, characterized in that: The taper α of the cutting edge is the cutting back angle, and α is 0 to 10°.

9. A method for using a cutting tool according to any one of claims 1 to 8, characterized in that: The following steps are involved: The spindle of the equipment clamps the tool holder, sets the speed to zero, finds the PTH through hole position and punches downwards; According to the thickness of the sheet material being processed, the punching is carried out in steps, and the feed depth of each step of the punching can be evenly divided according to the thickness of the sheet material.

10. A processing device, characterized in that: include: A tool as claimed in any one of claims 1 to 8.

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