Counterbore manufacturing method and circuit board with counterbore processing structure

Abstract

The invention provides a manufacturing method of a counterbore and a circuit board with a counterbore processing structure, and belongs to the technical field of printed circuit board processing, and the method comprises the following steps: arranging an insulation area with the range larger than that of the cross section of a to-be-drilled counterbore on the circuit board, arranging copper foil on the circuit board outside the insulation area, presetting a hole site of the to-be-drilled counterbore in the insulation area, a conduction area smaller than the cross section of the to-be-drilled counterbore is arranged in the hole position of the to-be-drilled counterbore, a wire is arranged in the conduction area, and the wire extends outwards from the conduction area and penetrates through the insulation area to be connected with the copper foil located outside the insulation area; the circuit board is provided with the counterbore prepared by the method. According to the method, the to-be-drilled counterbore position is preset in the insulation area, then the conduction area is arranged in the preset to-be-drilled counterbore position, and the conduction area and the copper foil on the periphery of the insulation area are communicated through the wire, so that when a drill bit of the numerical control drilling machine makes contact with the conduction area, a closed detection loop can be formed; therefore, the numerical control drilling machine can confirm the drilling depth.

Description

Technical Field

[0001] The invention relates to the technical field of printed circuit board processing, in particular to a method for manufacturing a countersunk hole and a circuit board with a countersunk hole processing structure. Background Art

[0002] A countersunk hole is a common hole type in machining. Its characteristic is that the diameter of the hole mouth is larger than the diameter of the hole bottom, forming a tapered structure with a larger top and a smaller bottom. Among them, countersunk holes for installing screws are usually provided in circuit boards, so that the screw head can smoothly transition with the circuit board surface, reducing interference with the surrounding environment, and also helping to improve the aesthetics of the product.

[0003] In order to achieve flush installation of the screw head and the circuit board, strict requirements are placed on the depth and accuracy of the countersunk hole. Currently, when making countersunk holes, a layer of aluminum sheet is usually first covered on the surface of the circuit board, and then a CNC drilling machine is used to drill the hole. The depth control principle of this method is: when the drill bit of the CNC drilling machine's spindle contacts the aluminum sheet covering the surface of the circuit board, the spindle and drill bit of the CNC drilling machine form a circuit that can trigger the contact plate detector to sense the change in capacitance. The servo of the CNC drilling machine will record the currently read drill bit depth as the zero point of the countersunk hole depth, and then control the drill bit to drill down to the preset depth to complete the countersunk hole processing.

[0004] Although the above method is effective, it requires covering each circuit board with a layer of aluminum sheet, which incurs additional material costs. If the aluminum sheet covering the circuit board surface is removed, the contact plate detector may not be able to sense the capacitance signal, making it impossible to confirm the depth of the drill hole. When the drilling depth cannot be confirmed, the countersunk hole produced is difficult to meet the design specifications, and therefore the processing accuracy of the countersunk hole cannot be guaranteed. Summary of the Invention

[0005] In order to overcome the problems existing in the related art, one of the purposes of the present invention is to provide a method for making a countersunk hole. This method presets the position of the countersunk hole to be drilled in the insulating area, then sets a conductive area in the preset position of the countersunk hole to be drilled, and uses a wire to connect the conductive area with the copper foil outside the insulating area, so that when the drill bit of the CNC drilling machine contacts the conductive area, a closed detection loop can be formed, thereby enabling the CNC drilling machine to confirm the depth of the drilling.

[0006] A method for manufacturing a countersunk hole and a circuit board having a countersunk hole processing structure, comprising the following steps:

[0007] An insulating area having a range larger than the cross section of the countersunk hole to be drilled is provided on the circuit board, and the copper foil on the circuit board is outside the insulating area;

[0008] Presetting a position for a countersink hole to be drilled in the insulating area, and setting a conductive area smaller than a cross section of the countersink hole to be drilled in the position for the countersink hole to be drilled;

[0009] A conductive wire is provided in the conductive area, and the conductive wire extends outward from the conductive area and passes through the insulating area to connect with the copper foil outside the insulating area;

[0010] Align the drill bit of the CNC drilling machine with the countersunk hole to be drilled. When the drill bit contacts the conductive area, the CNC drilling machine controls the drill bit to start drilling according to the signal generated by the contact plate detector until the drilling depth reaches the preset depth value.

[0011] Since the countersunk hole is a non-metallic hole, an insulating area with a range larger than the cross-section of the countersunk hole to be drilled is set on the circuit board, and the outside of the insulating area is covered with the copper foil of the circuit board, and then the position of the countersunk hole to be drilled is preset in the insulating area; by setting a conductive area in the preset position of the countersunk hole to be drilled, and using a wire to connect the conductive area with the copper foil outside the insulating area, when the drill bit of the CNC drilling machine contacts the conductive area, a closed detection loop can be formed, so that the contact plate detector sends a signal, and the CNC drilling machine starts drilling after reading the current drill depth value; therefore, this method can achieve precise drilling depth control without using the traditional method of covering the circuit board surface with aluminum sheets, thereby reducing material costs and processing complexity, while improving production efficiency and drilling accuracy, simplifying the production process, and helping to improve the reliability of the final product.

[0012] In a preferred technical solution of the present invention, the area of the countersunk hole to be drilled is greater than or equal to the cross-section of the countersunk hole to be drilled.

[0013] The position of the countersink hole to be drilled is larger than or equal to the cross section of the countersink hole to be drilled, while the area of the conductive area is smaller than the cross section of the countersink hole to be drilled, ensuring that the conductive area can be drilled out during the drilling process.

[0014] In a preferred technical solution of the present invention, the CNC drilling machine is provided with an air-floating spindle and a servo, and the drill bit is mounted on the lower end of the air-floating spindle; the drill bit of the CNC drilling machine is aligned with the position of the countersunk hole to be drilled, and when the drill bit contacts the conductive area, the CNC drilling machine controls the drill bit to start drilling according to the signal generated by the contact plate detector until the drilling depth reaches a preset depth value, including:

[0015] The drill bit at the lower end of the air-floating spindle in the CNC drilling machine is aligned with the position of the countersink hole to be drilled and then moved downward. When the drill bit contacts the conductive area, the CNC drilling machine, the contact plate detector, and the copper foil form a closed detection loop. The contact plate detector senses the change in capacitance and sends a signal. After receiving the signal, the servo of the CNC drilling machine records the currently read drill depth value as the zero point value of the countersink hole to be drilled, and controls the drill bit to start drilling downward according to the preset depth value.

[0016] When the drilling depth reaches the preset depth value, the CNC drilling machine controls the drill head to stop drilling.

[0017] Since the conductive area is connected to the copper foil, when the drill bit in the air-floating spindle of the CNC drilling machine contacts the conductive area, a closed detection loop is immediately formed, achieving the purpose of normally confirming the drilling depth without the aluminum sheet.

[0018] In a preferred technical solution of the present invention, when the drill bit of the CNC drilling machine is aligned with the countersunk hole to be drilled, when the drill bit contacts the conductive area, the CNC drilling machine controls the drill bit to start drilling according to the signal generated by the contact plate detector, until the drilling depth reaches the preset depth value, and the conductive area is drilled out during the drill processing process.

[0019] Ensure that the conductive area is drilled out during the drilling process to avoid the risk of conductor residue in the conductive area causing short circuits on the circuit board.

[0020] In a preferred technical solution of the present invention, the diameter of the wire is greater than or equal to 0.08 mm.

[0021] The best thickness of the conductor can be set to 0.1mm, ensuring that it can be conductive with the copper foil and not easily etched or worn during the circuit board production process.

[0022] A second object of the present invention is to provide a circuit board with a countersunk hole processing structure, comprising a circuit board body, an insulating area being provided on the body, and the outside of the insulating area being covered by the copper foil of the body;

[0023] A countersink hole to be drilled is provided in the insulating area, and a conducting area smaller than the cross section of the countersink hole to be drilled is provided in the countersink hole to be drilled;

[0024] A conductive wire is provided in the conductive area. The conductive wire extends outward from the conductive area and passes through the insulating area to be connected to the copper foil outside the insulating area.

[0025] This circuit board with a countersunk hole processing structure achieves the purpose of precise drilling depth control without using a single-sided aluminum cover by arranging a conductive area and a conductor within the insulating area during the design phase, thereby reducing material costs and simplifying the countersunk hole production process. At the same time, since the conductor extends outward from the conductive area and passes through the insulating area to connect with the external copper foil, the reliability of the electrical connection is ensured, and the processing accuracy of the countersunk hole is guaranteed.

[0026] In a preferred technical solution of the present invention, the conductive area is set to be circular.

[0027] The circular conductive area is an adaptive design based on the shape of the countersunk hole, which facilitates the conductive function while ensuring that it can be easily drilled out.

[0028] In a preferred technical solution of the present invention, the insulating area is preferably set to be circular.

[0029] The circular insulating area is an adaptive design based on the shape of the countersunk hole, ensuring the non-metallic properties of the countersunk hole.

[0030] In a preferred technical solution of the present invention, the number of the conductive wires is preferably four, and the four conductive wires extend outward from the circumference of the conducting area at equal intervals in the circumferential direction.

[0031] The setting of the wires must ensure that the conductive area can be connected to the copper foil. Therefore, multiple wires are set at equal intervals to prevent the wires from being etched or worn during the circuit board production process, resulting in loss of conductive function.

[0032] In a preferred technical solution of the present invention, the radius of the countersunk hole to be drilled is greater than 1 / 2 of the radius of the insulating area.

[0033] Avoid making the insulation area too large, which may affect other electrical functions of the circuit board.

[0034] The beneficial effects of the present invention are:

[0035] The present invention provides a method for making a countersunk hole, which presets a countersunk hole position to be drilled in an insulating area, then sets a conductive area in the preset countersunk hole position to be drilled, and uses a wire to connect the conductive area with the copper foil around the insulating area, so that when the drill bit of a CNC drilling machine contacts the conductive area, a closed detection loop can be formed, causing a contact plate detector to send a signal, and the CNC drilling machine starts drilling after reading the current drill depth value. Therefore, accurate drilling depth control can be achieved without using the traditional method of covering the circuit board surface with aluminum sheets, thereby reducing material costs and processing complexity, while improving production efficiency and drilling accuracy, simplifying the production process, and helping to improve the reliability of the final product.

[0036] The present invention provides a circuit board with a countersunk hole processing structure. By arranging a conductive area and a conductor within an insulating area during the design phase, precise drilling depth control is achieved without using a single-sided covering aluminum sheet, thereby reducing material costs and simplifying the countersunk hole production process. At the same time, since the conductor extends outward from the conductive area and passes through the insulating area to connect with the external copper foil, the reliability of the electrical connection is ensured, the processing accuracy of the countersunk hole is guaranteed, and the reliability of the circuit board is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 1 is a schematic diagram of the steps of a method for making a countersunk hole in an embodiment of the present invention;

[0038] Figure 2 1 is a schematic diagram of a detection circuit for a method for manufacturing a countersunk hole according to an embodiment of the present invention;

[0039] Figure 3 2. It is a schematic diagram of the countersunk hole processing structure in an embodiment of the present invention;

[0040] Figure 4 This is a schematic diagram of the countersunk hole processing structure in the prior art;

[0041] Figure 5 It is a physical schematic diagram of the countersunk hole processing structure in an embodiment of the present invention. DETAILED DESCRIPTION

[0042] The preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to make the present invention more thorough and complete and to fully convey the scope of the present invention to those skilled in the art.

[0043] A countersunk hole is a common hole type in machining. Its characteristic is that the diameter of the hole mouth is larger than the diameter of the hole bottom, forming a tapered structure with a larger top and a smaller bottom. Among them, countersunk holes for installing screws are usually provided in circuit boards, so that the screw head can smoothly transition with the circuit board surface, reducing interference with the surrounding environment, and also helping to improve the aesthetics of the product.

[0044] In order to achieve flush installation of the screw head and the circuit board, strict requirements are placed on the depth and accuracy of the countersunk hole. Currently, when making countersunk holes, a layer of aluminum sheet is usually first covered on the surface of the circuit board, and then a CNC drilling machine is used to drill the hole. The depth control principle of this method is: when the drill bit of the CNC drilling machine's spindle contacts the aluminum sheet covering the surface of the circuit board, the spindle and drill bit of the CNC drilling machine form a circuit that can trigger the contact plate detector to sense the change in capacitance. The servo of the CNC drilling machine will record the currently read drill bit depth as the zero point of the countersunk hole depth, and then control the drill bit to drill down to the preset depth to complete the countersunk hole processing.

[0045] Although the above method is effective, it requires covering each circuit board with a layer of aluminum sheet, which incurs additional material costs. If the aluminum sheet covering the circuit board surface is removed, the contact plate detector may not be able to sense the capacitance signal, making it impossible to confirm the depth of the drill hole. When the drilling depth cannot be confirmed, the countersunk hole produced is difficult to meet the design specifications, and therefore the processing accuracy of the countersunk hole cannot be guaranteed.

[0046] Based on this, the present application provides a method for manufacturing a countersunk hole and a circuit board with a countersunk hole processing structure.

[0047] Example 1

[0048] See also Figure 1-Figure 3 , this embodiment provides a method for making a countersunk hole, comprising the following steps:

[0049] An insulating area with a range larger than the cross section of the countersunk hole to be drilled is set on the circuit board, and the copper foil on the circuit board is outside the insulating area;

[0050] Presetting a position for a countersink hole to be drilled in the insulating area, and providing a conductive area smaller than a cross section of the countersink hole to be drilled in the position for the countersink hole to be drilled; wherein the area of the position for the countersink hole to be drilled is greater than or equal to the cross section of the countersink hole to be drilled;

[0051] A conducting wire is provided in the conducting area, and the conducting wire extends outward from the conducting area and passes through the insulating area to be connected with the copper foil outside the insulating area;

[0052] like Figure 2 As shown, a circuit board is placed on a workbench of a CNC drilling machine, wherein the CNC drilling machine is provided with an air-floating spindle and a servo. A drill bit is installed at the lower end of the air-floating spindle. The drill bit at the lower end of the air-floating spindle in the CNC drilling machine is aligned with the position of the countersink hole to be drilled and then moved downward. When the drill bit contacts the conductive area, the CNC drilling machine, the contact plate detector and the copper foil form a closed detection loop. The contact plate detector senses the capacitance change and sends a signal. After receiving the signal, the servo of the CNC drilling machine records the currently read drill bit depth value as the zero point value of the countersink hole to be drilled, and controls the drill bit to start drilling downward according to the preset depth value.

[0053] Among them, ensure that the conductive area is drilled out during the drilling process to avoid the risk of conductor residue in the conductive area causing short circuit on the circuit board;

[0054] When the drilling depth reaches the preset depth value, the CNC drilling machine controls the drill head to stop drilling.

[0055] Specifically, the principle of this method for detecting the circuit is: when the drill bit of the CNC drilling machine is not in contact with the conductive area, the circuit where the capacitor is located is open, and the capacitor does not output an electric potential at this time. When the drill bit is in contact with the conductive area, the circuit where the capacitor is located is connected. At this time, there is a potential difference between the two connected ends of the circuit. The capacitor changes its own capacitance value due to the potential difference, so the CNC drilling machine can receive the signal.

[0056] The method presets a countersunk hole position to be drilled in an insulating area, then sets a conductive area in the preset countersunk hole position to be drilled, and uses a wire to connect the conductive area with the copper foil outside the insulating area. When the drill bit of a CNC drilling machine contacts the conductive area, a closed detection loop can be formed, causing a contact plate detector to send a signal, and the CNC drilling machine starts drilling after reading the current drill depth value. Therefore, accurate drilling depth control can be achieved without using the traditional method of covering the circuit board surface with aluminum sheets, thereby reducing material costs and processing complexity, while improving production efficiency and drilling accuracy, simplifying the production process, and helping to improve the reliability of the final product.

[0057] Example 2

[0058] See also Figure 1-Figure 3 , this embodiment provides a method for making a countersunk hole, comprising the following steps:

[0059] A circular insulating area with a diameter of 2.25 mm is set on the circuit board, and the copper foil on the circuit board is outside the insulating area;

[0060] A circular countersink hole with a diameter of 1.5 mm is preset in the insulating area, and a circular conductive area with a diameter of 1.4 mm is set in the countersink hole to be drilled;

[0061] Four conductors are arranged in the conducting area, and the four conductors extend outward from the circumference of the conducting area at equal intervals and pass through the insulating area to connect with the copper foil outside the insulating area;

[0062] A circuit board is placed on a workbench of a CNC drilling machine, wherein the CNC drilling machine is provided with an air-floating spindle and a servo. A drill bit is installed at the lower end of the air-floating spindle. The drill bit at the lower end of the air-floating spindle in the CNC drilling machine is aligned with the position of the countersink hole to be drilled and then moved downward. When the drill bit contacts the conductive area, the CNC drilling machine, the contact plate detector and the copper foil form a closed detection loop. The contact plate detector senses the change in capacitance and sends a signal. After receiving the signal, the servo of the CNC drilling machine records the currently read drill bit depth value as the zero point value of the countersink hole to be drilled, and controls the drill bit to start drilling downward according to the preset depth value.

[0063] Among them, ensure that the conductive area is drilled out during the drilling process to avoid the risk of conductor residue in the conductive area causing short circuit on the circuit board;

[0064] When the drilling depth reaches the preset depth value, the CNC drilling machine controls the drill head to stop drilling.

[0065] Specifically, the principle of this method for detecting the circuit is: when the drill bit of the CNC drilling machine is not in contact with the conductive area, the circuit where the capacitor is located is open, and the capacitor does not output an electric potential at this time. When the drill bit is in contact with the conductive area, the circuit where the capacitor is located is connected. At this time, there is a potential difference between the two connected ends of the circuit. The capacitor changes its own capacitance value due to the potential difference, so the CNC drilling machine can receive the signal.

[0066] The method presets a countersunk hole position to be drilled in an insulating area, then sets a conductive area in the preset countersunk hole position to be drilled, and uses a wire to connect the conductive area with the copper foil outside the insulating area. When the drill bit of a CNC drilling machine contacts the conductive area, a closed detection loop can be formed, causing a contact plate detector to send a signal, and the CNC drilling machine starts drilling after reading the current drill depth value. Therefore, accurate drilling depth control can be achieved without using the traditional method of covering the circuit board surface with aluminum sheets, thereby reducing material costs and processing complexity, while improving production efficiency and drilling accuracy, simplifying the production process, and helping to improve the reliability of the final product.

[0067] Example 3

[0068] See also Figure 1-Figure 5 This embodiment provides a circuit board with a countersunk hole processing structure, including a circuit board body, on which an insulating area is provided. Since the countersunk hole is usually non-metallic, the insulating area is required to prevent the countersunk hole from conducting electricity and affecting the electrical performance of the circuit board. The insulating area is covered by the copper foil of the body;

[0069] A countersink hole position to be drilled is set in the insulating area, the countersink hole position to be drilled is the drilling position of the countersink hole, and a conductive area smaller than the cross section of the countersink hole to be drilled is provided in the countersink hole position to be drilled, and the conductive area can conduct electricity;

[0070] A conducting wire is provided in the conducting area. The conducting wire extends outward from the conducting area and passes through the insulating area to be connected with the copper foil outside the insulating area. The conducting wire is used to connect the loop between the conducting area and the copper foil.

[0071] In this embodiment, if Figure 3 As shown, the conductive area is set to be circular. The circular conductive area is an adaptive design adopted according to the shape of the countersunk hole, which facilitates the realization of the conductive function while ensuring that it is easy to be drilled out; the insulating area is also adaptively set to be circular.

[0072] Specifically, the optimal number of conductors is four, and the four conductors extend outward from the circumference of the conductive area at equal intervals to ensure that the conductive area can be connected to the copper foil. Therefore, multiple conductors are set at equal intervals to prevent the conductors from being etched or worn during the circuit board production process, resulting in loss of conductive function.

[0073] The radius of the countersunk hole to be drilled should be greater than 1 / 2 of the radius of the insulation area to avoid the insulation area being too large and affecting other electrical functions of the circuit board.

[0074] Figure 4 The figure shows the actual structure of the countersunk hole processing in the prior art. Since there is no conductive area and wire, it is necessary to cover the surface of the circuit board with aluminum sheets to form a detection circuit. Figure 5 This is a physical picture of the countersunk hole processing structure used in this embodiment. Due to the provision of the conductive area and the wire, a closed detection loop can be formed for depth-controlled drilling without the need for additional aluminum sheet covering.

[0075] When processing the countersunk hole on this circuit board, the working process is as follows:

[0076] Place the circuit board on the workbench of a CNC drilling machine, wherein the CNC drilling machine is provided with an air-floating spindle and a servo, and a drill bit is installed at the lower end of the air-floating spindle. Align the drill bit at the lower end of the air-floating spindle in the CNC drilling machine with the position of the countersink hole to be drilled and then move downward. When the drill bit contacts the conductive area, the CNC drilling machine, the contact plate detector and the copper foil form a closed detection loop. The contact plate detector sends a signal after sensing the change in capacitance. After receiving the signal, the servo of the CNC drilling machine records the currently read drill bit depth value as the zero point value of the countersink hole to be drilled, and controls the drill bit to start drilling downward according to the preset depth value. When the drilling depth reaches the preset depth value, the CNC drilling machine controls the drill bit to complete the drilling.

[0077] The circuit board of the present invention achieves precise control of drilling depth without using a single-sided aluminum cover by arranging a conductive area and a conductive wire within the insulating area during the design phase, thereby reducing material costs and simplifying the countersunk hole production process. At the same time, since the conductive wire extends outward from the conductive area and passes through the insulating area to connect with the external copper foil, the reliability of the electrical connection is ensured, the processing accuracy of the countersunk hole is guaranteed, and the reliability of the circuit board is improved.

[0078] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0079] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0080] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A method for making a countersunk hole, characterized in that: The following steps are involved: An insulating area having a range larger than the cross section of the countersunk hole to be drilled is provided on the circuit board, and the outside of the insulating area is the copper foil on the circuit board; Presetting a position for a countersink hole to be drilled in the insulating area, and setting a conductive area smaller than a cross section of the countersink hole to be drilled in the position for the countersink hole to be drilled; A conductive wire is provided in the conductive area, and the conductive wire extends outward from the conductive area and passes through the insulating area to connect with the copper foil outside the insulating area; Align the drill bit of the CNC drilling machine with the countersunk hole to be drilled. When the drill bit contacts the conductive area, the CNC drilling machine controls the drill bit to start drilling according to the signal generated by the contact plate detector until the drilling depth reaches the preset depth value.

2. The method for making a countersunk hole according to claim 1, wherein: The area of the hole position to be drilled is greater than or equal to the cross section of the countersunk hole to be drilled.

3. The method for making a countersunk hole according to claim 1, wherein: The CNC drilling machine is provided with an air-floating spindle and a servo, and the drill bit is mounted on the lower end of the air-floating spindle; the drill bit of the CNC drilling machine is aligned with the position of the countersunk hole to be drilled, and when the drill bit contacts the conductive area, the CNC drilling machine controls the drill bit to start drilling according to the signal generated by the contact plate detector until the drilling depth reaches a preset depth value, including: The drill bit at the lower end of the air-floating spindle in the CNC drilling machine is aligned with the position of the countersink hole to be drilled and then moved downward. When the drill bit contacts the conductive area, the CNC drilling machine, the contact plate detector, and the copper foil form a closed detection loop. The contact plate detector senses the change in capacitance and sends a signal. After receiving the signal, the servo of the CNC drilling machine records the currently read drill depth value as the zero point value of the countersink hole to be drilled, and controls the drill bit to start drilling downward according to the preset depth value. When the drilling depth reaches the preset depth value, the CNC drilling machine controls the drill head to stop drilling.

4. The method for manufacturing a countersunk hole according to claim 1, wherein: When the drill bit of the CNC drilling machine is aligned with the countersunk hole to be drilled, when the drill bit contacts the conductive area, the CNC drilling machine controls the drill bit to start drilling according to the signal generated by the contact plate detector. When the drilling depth reaches the preset depth value, the conductive area is drilled out during the drilling process.

5. The method for making a countersunk hole according to claim 1, wherein: The diameter of the wire is greater than or equal to 0.08 mm.

6. A circuit board with a countersunk hole processing structure, characterized in that: It includes a circuit board body, wherein an insulating area is provided on the body, and the outside of the insulating area is covered by the copper foil of the body; A countersink hole to be drilled is provided in the insulating area, and a conducting area smaller than the cross section of the countersink hole to be drilled is provided in the countersink hole to be drilled; A conductive wire is provided in the conductive area. The conductive wire extends outward from the conductive area and passes through the insulating area to be connected to the copper foil outside the insulating area.

7. The circuit board with a countersunk hole processing structure according to claim 6, characterized in that: The conductive area is configured as a circle.

8. The circuit board with a countersunk hole processing structure according to claim 7, characterized in that: The insulating area is preferably circular.

9. The circuit board with a countersunk hole processing structure according to claim 8, characterized in that: The number of the conductive wires is preferably four, and the four conductive wires extend outward from the circumference of the conductive area at equal intervals in the circumferential direction.

10. The circuit board with a countersunk hole processing structure according to claim 8, characterized in that: The radius of the countersunk hole to be drilled is greater than 1 / 2 of the radius of the insulating area.

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