A method for manufacturing irregularly shaped holes in a circuit board

Abstract

This invention discloses a method for manufacturing irregularly shaped holes on circuit boards. Different drill bit data is set according to the positional relationship of the circular holes, ensuring that the dimensions and shapes of the drilled holes meet user requirements, which is beneficial for subsequent component installation. Standardized drill bit data reduces the problem of drill bit breakage during drilling, saving manufacturing costs. No modification to the drilling data is required during the drilling process, thus reducing the need for repeated machine stops to modify the drilling data, increasing production capacity and saving water, electricity, and gas resources. It also reduces potential quality defects caused by non-standard engineering data, such as poor copper plating backlighting, poor hole wall adhesion, no copper in the hole, copper separation from the hole wall, blow holes, burst holes, poor inner layer connections, open circuits, roughness inside the hole, burrs, and plating nodules, thereby improving product quality.

Description

Technical Field

[0001] This invention relates to the field of printed circuit board manufacturing technology, specifically to a method for manufacturing irregularly shaped holes in a circuit board, and particularly to a method for manufacturing irregularly shaped holes between round holes. Background Technology

[0002] Holes on printed circuit boards (PCBs) are just as important as circuitry. Holes, formed by plating a certain thickness of copper on their walls, extend through the entire PCB, enabling electrical connections between conductive patterns on the inner and outer layers, or between the inner and outer layers. Non-metallic vias, on the other hand, do not participate in electrical connections on the PCB; they primarily serve functions such as fixing, mounting holes, screw adjustment access holes, and wire transmission holes.

[0003] Holes on circuit boards include regular round holes and irregularly shaped holes, primarily square slot holes and elliptical holes. Round holes are the most common hole shape, easy to process, and can meet most needs. Square slot holes are mainly used for connecting clips or components, while elliptical holes are mainly used to solve situations where component pins are too densely packed. For a long time, the circuit board industry has lacked unified standards for processing engineering data for irregularly shaped holes. Instead, drilling data is received on the production line, and during the drilling process, discrepancies between dimensions and shapes and customer requirements are discovered, leading to temporary modifications to the data. Typically, the data for a single irregularly shaped hole is revised multiple times to meet the requirements.

[0004] The existing irregular hole manufacturing process has the following problems: 1. Irregular holes are prone to deformation after drilling, making subsequent installation of electrical components difficult or impossible; 2. Frequent drill bit breakage during drilling increases manufacturing costs; 3. Repeated shutdowns to modify drilling data affect production capacity and waste water, electricity, and gas resources; 4. It easily leads to quality defects such as poor copper plating backlighting, poor hole wall adhesion, no copper inside the hole, copper separation from the hole wall, blow holes, burst holes, poor inner layer connection, short circuits, roughness inside the hole, burrs, and plating nodules. Figure 1 As shown.

[0005] Therefore, it is necessary to provide a new method for manufacturing irregular holes on circuit boards to solve the above-mentioned technical problems. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a method for manufacturing irregular holes in circuit boards, which is used to standardize the manufacturing of irregular holes between round holes. After drilling, the shape and size meet the requirements, which is beneficial to the subsequent installation of components. Furthermore, the drilling quality is improved due to the standardization of engineering data, and the manufacturing cost can be reduced at the same time.

[0007] The technical solution of the present invention is as follows:

[0008] A method for manufacturing irregularly shaped holes on a circuit board, applied to the fabrication of irregularly shaped holes between round holes, is as follows:

[0009] When an irregularly shaped hole is formed by connecting a tangential or externally separated first drill hole D1 and a second drill hole D2, its manufacturing method includes the following steps:

[0010] Step S1: Drill the first hole D1 and the second hole D2 in sequence;

[0011] Step S2: Using the center point of the minimum distance between the walls of the first borehole D1 and the second borehole D2 as the center, drill a repair hole d. The maximum diameter of the repair hole d is 0.5mm-0.7*ΦD2.

[0012] Step S3: First, drill a second deburring hole d2 corresponding to the second drill hole D2, and then drill a first deburring hole d1 corresponding to the first drill hole D1. The second deburring hole d2 is tangent to the straight line passing through the intersection of the second drill hole D2 and the repair hole d, and the first deburring hole d1 is tangent to the straight line passing through the intersection of the first drill hole D1 and the repair hole d.

[0013] When an irregular hole is formed by the intersection of a first drill hole D1 and a second drill hole D2, if the straight-line distance from the intersection point to the edge of the hole is ≤4mil, the drill tape is designed as a short slot hole. If the straight-line distance from the intersection point to the edge of the hole is >4mil, the manufacturing method of the irregular hole drill tape includes the following steps:

[0014] Step S1a: Drill the first hole D1 and the second hole D2 in sequence;

[0015] Step S2a: Using the center point of the line connecting the intersection of the first drill hole D1 and the second drill hole D2 as the center, drill a repair hole d. The diameter of the repair hole d satisfies that the sharp angle at the intersection of the single-sided cutting holes is 0.15mm, that is, Φd=c+0.3mm, where c represents the distance between the intersection points of the first drill hole D1 and the second drill hole D2.

[0016] Step S3a: First, drill a second deburring hole d2 corresponding to the second drill hole D2, and then drill a first deburring hole d1 corresponding to the first drill hole D1. The second deburring hole d2 is tangent to the straight line passing through the intersection of the second drill hole D2 and the repair hole d, and the first deburring hole d1 is tangent to the straight line passing through the intersection of the first drill hole D1 and the repair hole d.

[0017] Furthermore, when an irregular hole is formed by connecting a first drilled hole D1 that is tangent or externally separated with a second drilled hole D2, the minimum distance S between the connecting holes of the first drilled hole D1 and the second drilled hole D2 satisfies: 0≤S≤0.15mm.

[0018] Furthermore, the diameter of the first deburring hole d1 is Φd1 = ΦD1 - 0.1 mm, and the diameter of the second deburring hole d2 is Φd2 = ΦD2 - 0.1 mm.

[0019] Furthermore, ΦD1≤ΦD2.

[0020] Furthermore, the second drill hole D2, the repair hole d, the first deburring hole d1, and the second deburring hole d2 are all drilled using a grooving tool.

[0021] Furthermore, when an irregular hole is formed by connecting multiple round holes, the process of making the irregular hole is to first drill the first hole D1 and the second hole D2 located at both ends of the irregular hole, and then drill the third hole D3 located between the first hole D1 and the second hole D2.

[0022] Furthermore, when an irregularly shaped hole is formed by connecting multiple circular holes, its manufacturing method includes the following steps:

[0023] Step S1b: Drill the first hole D1 and the second hole D2 located at both ends of the irregular hole in sequence, and then drill the third hole D3 located between the first hole D1 and the second hole D2.

[0024] Step S2b: Based on the positional relationship between the third borehole D3 and the first borehole D1 and the second borehole D2, drill the corresponding repair holes d respectively;

[0025] Step S3b, Drill deburring holes: Based on the positional relationship between the third drill hole D3 and the first drill hole D1 and the second drill hole D2, first drill the first deburring hole d1 and the second deburring hole d2 between the third drill hole D3 and the second drill hole D2, and then drill the third deburring hole d3 and the fourth deburring hole d4 between the third drill hole D3 and the first drill hole D1.

[0026] Compared with the prior art, the method for manufacturing irregular holes in circuit boards provided by the present invention has the following advantages:

[0027] The method for manufacturing irregular holes in circuit boards provided by this invention standardizes the drilling engineering data for irregular holes between round holes. The dimensions and shapes of the drilled holes meet user requirements, which is beneficial for subsequent component installation. Standardized drilling data helps reduce the problem of drill bit breakage during drilling, saving manufacturing costs. No modification to the drilling data is required during the drilling process, thus reducing the problem of repeated machine stops to modify the drilling data, increasing production capacity and saving water, electricity and gas resources. It also reduces the potential quality defects caused by non-standard engineering data, such as poor copper plating backlight, poor hole wall bonding, no copper in the hole, copper separation in the hole wall, blow holes, burst holes, poor inner layer connection, open circuits, roughness inside the hole, burrs, and plating nodules, thereby improving product quality. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a rendering of the fabrication of irregular holes using existing technology;

[0030] Figure 2 This is a schematic diagram of the irregular hole drill strip design of Embodiment 1 of the present invention;

[0031] Figure 3 This is a schematic diagram of the drill tape design in one embodiment of the irregular hole of the present invention, as shown in Embodiment 2 of the present invention;

[0032] Figure 4 This is a schematic diagram of the drill strip design for another embodiment of the irregular hole in Embodiment 2 of the present invention;

[0033] Figure 5 This is a rendering of the irregular hole fabrication process in Embodiment 2 of the present invention;

[0034] Figure 6 This is a schematic diagram of the irregular hole drill strip design in Embodiment 3 of the present invention. Detailed Implementation

[0035] To enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention, and to make the above-mentioned objectives, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be further described below.

[0036] It should be noted that the descriptions of these embodiments are for the purpose of aiding understanding the present invention, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0037] Example 1

[0038] Please see Figure 2 This is a schematic diagram of the irregular hole drill strip design in Embodiment 1 of the present invention. The irregular hole in this embodiment is formed by connecting a tangent or externally separated first drill hole D1 and a second drill hole D2. Its manufacturing method includes the following steps:

[0039] Step S1: Drill the first hole D1 and the second hole D2 in sequence, where ΦD1≤ΦD2, and the minimum distance S between the connecting holes of the first hole D1 and the second hole D2 satisfies: 0≤S≤0.15mm.

[0040] Step S2: Using the center point of the minimum distance between the walls of the first drill hole D1 and the second drill hole D2 as the center, drill a repair hole d. The maximum diameter of the repair hole d is 0.5mm-0.7*ΦD2. Select the nearest metric tool for the repair hole d.

[0041] Step S3: First, drill a second deburring hole d2 corresponding to the second drill hole D2, and then drill a first deburring hole d1 corresponding to the first drill hole D1. The second deburring hole d2 is tangent to the straight line passing through the intersection of the second drill hole D2 and the repair hole d, and the first deburring hole d1 is tangent to the straight line passing through the intersection of the first drill hole D1 and the repair hole d.

[0042] The diameter of the first deburring hole d1 is Φd1 = ΦD1 - 0.1mm, and the diameter of the second deburring hole d2 is Φd2 = ΦD2 - 0.1mm. The first drilling hole D1 is drilled with a metric tool, and the second drilling hole D2, the repair hole d, the first deburring hole d1 and the second deburring hole d2 are all drilled with a grooving tool to prevent tool breakage during the process.

[0043] Example 2

[0044] In this embodiment, the irregular hole is formed by connecting the intersecting first drill hole D1 and second drill hole D2.

[0045] When the straight-line distance from the intersection point to the edge of the hole is ≤4mil, the drill tape should be designed as a short slot hole, such as... Figure 3 As shown, the method for manufacturing short slots can refer to existing technologies.

[0046] Please see Figure 4 This is a schematic diagram of the drill strip design for another embodiment of the irregular hole in Embodiment 2 of the present invention. When the straight-line distance from the intersection point to the edge of the hole is > 4 mil, the method for manufacturing the irregular hole includes the following steps:

[0047] Step S1a: Drill the first borehole D1 and the second borehole D2 in sequence, where ΦD1≤ΦD2;

[0048] Step S2a: Using the center point of the line connecting the intersection of the first drill hole D1 and the second drill hole D2 as the center, drill a repair hole d. The diameter of the repair hole d satisfies that the sharp angle at the intersection of the single-sided cutting holes is 0.15mm, that is, Φd=c+0.3mm, where c represents the distance between the intersection points of the first drill hole D1 and the second drill hole D2.

[0049] Step S3a: First, drill a second deburring hole d2 corresponding to the second drill hole D2, and then drill a first deburring hole d1 corresponding to the first drill hole D1. The second deburring hole d2 is tangent to the straight line passing through the intersection of the second drill hole D2 and the repair hole d, and the first deburring hole d1 is tangent to the straight line passing through the intersection of the first drill hole D1 and the repair hole d. The effect diagram of the irregular hole is shown below. Figure 5 As shown.

[0050] In this embodiment, the diameter of the first deburring hole d1 is Φd1 = ΦD1 - 0.1mm, and the diameter of the second deburring hole d2 is Φd2 = ΦD2 - 0.1mm; the first drill hole D1 is drilled with a metric tool, and the second drill hole D2, the repair hole d, the first deburring hole d1 and the second deburring hole d2 are all drilled with a grooving tool.

[0051] Example 3

[0052] Please see Figure 6 This is a schematic diagram of the irregular hole drill strip design in Embodiment 3 of the present invention. The irregular hole in this embodiment is formed by connecting multiple circular holes, and its manufacturing method includes the following steps:

[0053] Step S1b: Drill the first hole D1 and the second hole D2 located at both ends of the irregular hole in sequence, and then drill the third hole D3 located between the first hole D1 and the second hole D2.

[0054] Step S2b: Based on the positional relationship between the third borehole D3 and the first borehole D1 and the second borehole D2, drill the corresponding repair holes d respectively using the methods of Example 1 / Example 2;

[0055] Step S3b, Drilling deburring holes: Based on the positional relationship between the third drill hole D3 and the first drill hole D1 and the second drill hole D2, corresponding deburring holes are drilled respectively using the method of Example 1 / Example 2. The drilling sequence of the deburring holes is as follows: first drill the first deburring hole d1 and the second deburring hole d2 between the third drill hole D3 and the second drill hole D2, and then drill the third deburring hole d3 and the fourth deburring hole d4 between the third drill hole D3 and the first drill hole D1.

[0056] Among them, the first drill hole D1 and the second drill hole D2 are drilled with metric tools, while the third drill hole D3, the repair hole d, the first deburring hole d1, the second deburring hole d2, the third deburring hole d3 and the fourth deburring hole d4 are all drilled with grooving tools.

[0057] Similarly, depending on the size of the irregular hole, multiple holes can be drilled between the first hole D1 and the second hole D2. The method for making the drill tape is described in Example 3.

[0058] Compared with the prior art, the method for manufacturing irregular holes in circuit boards provided by the present invention has the following advantages:

[0059] The method for manufacturing irregular holes in circuit boards provided by this invention standardizes the drilling engineering data for irregular holes between round holes. The dimensions and shapes of the drilled holes meet user requirements, which is beneficial for subsequent component installation. Standardized drilling data helps reduce the problem of drill bit breakage during drilling, saving manufacturing costs. No modification to the drilling data is required during the drilling process, thus reducing the problem of repeated machine stops to modify the drilling data, increasing production capacity and saving water, electricity and gas resources. It also reduces the potential quality defects caused by non-standard engineering data, such as poor copper plating backlight, poor hole wall bonding, no copper in the hole, copper separation in the hole wall, blow holes, burst holes, poor inner layer connection, open circuits, roughness inside the hole, burrs, and plating nodules, thereby improving product quality.

[0060] The embodiments of the present invention have been described in detail above, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations made to these embodiments without departing from the principles and spirit of the present invention still fall within the protection scope of the present invention.

Claims

1. A method for manufacturing irregularly shaped holes on a circuit board, characterized in that, This method is applied to the fabrication of irregularly shaped holes between round holes. The fabrication method for irregularly shaped holes is as follows: When an irregularly shaped hole is formed by connecting a tangential or externally separated first drill hole D1 and a second drill hole D2, its manufacturing method includes the following steps: Step S1: Drill the first hole D1 and the second hole D2 in sequence; Step S2: Using the center point of the minimum distance between the walls of the first borehole D1 and the second borehole D2 as the center, drill a repair hole d. The maximum diameter of the repair hole d is 0.5mm-0.7*ΦD2. Step S3: First, drill a second deburring hole d2 corresponding to the second drill hole D2, and then drill a first deburring hole d1 corresponding to the first drill hole D1. The second deburring hole d2 is tangent to the straight line passing through the intersection of the second drill hole D2 and the repair hole d, and the first deburring hole d1 is tangent to the straight line passing through the intersection of the first drill hole D1 and the repair hole d. When an irregular hole is formed by connecting an intersecting first drill hole D1 and a second drill hole D2, if the straight-line distance from the intersection point to the edge of the hole is ≤4mil, the drill tape is designed as a short slot hole; if the straight-line distance from the intersection point to the edge of the hole is >4mil, the method for manufacturing the irregular hole includes the following steps: Step S1a: Drill the first hole D1 and the second hole D2 in sequence; Step S2a: Using the center point of the line connecting the intersection of the first drill hole D1 and the second drill hole D2 as the center, drill a repair hole d. The diameter of the repair hole d satisfies the requirement that the sharp angle at the intersection of the single-sided cut-through holes is 0.15mm. Step S3a: First, drill a second deburring hole d2 corresponding to the second drill hole D2, and then drill a first deburring hole d1 corresponding to the first drill hole D1. The second deburring hole d2 is tangent to the straight line passing through the intersection of the second drill hole D2 and the repair hole d, and the first deburring hole d1 is tangent to the straight line passing through the intersection of the first drill hole D1 and the repair hole d.

2. The method for manufacturing irregular holes in a circuit board according to claim 1, characterized in that, When an irregular hole is formed by connecting a first drilled hole D1 that is tangent or externally separated with a second drilled hole D2, the minimum distance S between the connecting holes of the first drilled hole D1 and the second drilled hole D2 satisfies: 0≤S≤0.15mm.

3. The method for manufacturing irregularly shaped holes in a circuit board according to claim 1, characterized in that, The diameter of the first deburring hole d1 is Φd1 = ΦD1 - 0.1mm, and the diameter of the second deburring hole d2 is Φd2 = ΦD2 - 0.1mm.

4. The method for manufacturing irregular holes in a circuit board according to claim 3, characterized in that, ΦD1≤ΦD2.

5. The method for manufacturing irregularly shaped holes in a circuit board according to claim 1, characterized in that, The second drilled hole D2, the repair hole d, the first deburring hole d1, and the second deburring hole d2 are all drilled using a grooving tool.

6. The method for manufacturing irregularly shaped holes in a circuit board according to any one of claims 1-5, characterized in that, When an irregular hole is formed by connecting multiple round holes, the process of making the irregular hole is to first drill the first hole D1 and the second hole D2 located at both ends of the irregular hole, and then drill the third hole D3 located between the first hole D1 and the second hole D2.

7. The method for manufacturing irregularly shaped holes in a circuit board according to claim 6, characterized in that, The method for fabricating irregularly shaped holes includes the following steps: Step S1b: Drill the first hole D1 and the second hole D2 at both ends of the irregular hole in sequence, and then drill the third hole D3 between the first hole D1 and the second hole D2. Step S2b: Based on the positional relationship between the third borehole D3 and the first borehole D1 and the second borehole D2, drill the corresponding repair holes d respectively; Step S3b, Drill deburring holes: Based on the positional relationship between the third drill hole D3 and the first drill hole D1 and the second drill hole D2, first drill the first deburring hole d1 and the second deburring hole d2 between the third drill hole D3 and the second drill hole D2, and then drill the third deburring hole d3 and the fourth deburring hole d4 between the third drill hole D3 and the first drill hole D1.

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