Processing method of L-shaped slotted hole

Abstract

The invention discloses a processing method of an L-shaped slotted hole, which is used for a PCB (Printed Circuit Board) and comprises the following steps of: drilling two oppositely arranged guide holes in the PCB; reaming the guide hole, and drilling a first slotted hole in the first direction in a drill jumping form; a second slotted hole is drilled in the second direction in a drill jumping mode, the end of the first slotted hole is connected with the end of the second slotted hole, and the first direction is perpendicular to the second direction; and drilling is conducted on the intersection of the ends of the first slotted hole and the second slotted hole so as to remove burrs. Compared with the prior art, burrs generated at corners can be cleaned, and the cost quality is improved.

Description

Technical Field

[0001] The invention relates to a method for processing an L-shaped slot hole, and belongs to the field of PCB circuit board manufacturing. Background Art

[0002] PCB, also known as printed circuit board, is an important electronic component, a support for electronic components, and a carrier for the electrical connection of electronic components. During the plate making process, a large number of holes need to be drilled to match the packaged components or the internal circuit connections of the PCB, including L-shaped slots.

[0003] The L-shaped slot provides the necessary space and path for the installation of electronic components and circuit connection, so the processing quality of the L-shaped slot directly affects the performance and reliability of the PCB. In addition to the dimensional accuracy and positional accuracy of the L-shaped slot, if there are burrs in the slot or at the corners, it may affect the insertion and welding of electronic components, resulting in poor circuit connection, thereby reducing the performance and stability of the product.

[0004] In view of this, it is indeed necessary to improve the existing L-shaped slot processing method to solve the above problems. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a method for processing an L-shaped slot hole, which can remove burrs at the corners of the L-shaped slot hole.

[0006] The technical solution of the present invention is:

[0007] A method for processing an L-shaped slot for a PCB board comprises the following steps:

[0008] Drilling two guide holes arranged opposite to each other on the PCB board;

[0009] Expanding the guide hole and drilling a first slot hole along a first direction in a jump drilling manner;

[0010] Drilling a second slot hole along a second direction in a jump drill manner, wherein ends of the first slot hole and the second slot hole are connected, and the first direction and the second direction are perpendicular;

[0011] The intersection of the ends of the first slot and the second slot is drilled to remove burrs. The jump drilling method can better control the heat and stress during the drilling process, which helps to improve the dimensional accuracy of the slot and reduce the influence of thermal deformation and mechanical deformation on the accuracy of the slot during the drilling process.

[0012] As a further improvement of the present invention, the distance between the two guide holes is the same as the length of the first slot.

[0013] As a further improvement of the present invention, the hole drilled at the intersection of the ends of the first slot hole and the second slot hole is defined as a burr repair hole, and the projection of the burr repair hole on the PCB board at least partially overlaps with the projection of the first slot hole and the second slot hole on the PCB board.

[0014] As a further improvement of the present invention, the axis of the PCB board is defined as the center point, and a plane rectangular coordinate system is established with the center point as the origin to form four quadrants. There are at least four L-shaped slots and they are respectively located in the four quadrants.

[0015] As a further improvement of the present invention, the order of the first slot hole and the second slot hole drilled in the first quadrant is the same as the order of the first slot hole and the second slot hole drilled in the third quadrant, and the order of the first slot hole and the second slot hole drilled in the second quadrant is the same as the order of the first slot hole and the second slot hole drilled in the fourth quadrant.

[0016] As a further improvement of the present invention, the step of processing the L-shaped slot in the first quadrant and the second quadrant at the same time includes:

[0017] Drilling two guide holes opposite to each other in the first quadrant and the second quadrant respectively;

[0018] Expanding the guide hole in the first quadrant and drilling a first slot hole along a first direction in a jump drill manner;

[0019] Taking one of the guide holes in the second quadrant as a starting point, drilling a third slot hole along the second direction in a jump drill manner;

[0020] Expanding the guide hole in the second quadrant, and drilling a fourth slot hole along the first direction in the form of a jump drill, wherein the ends of the third slot hole and the fourth slot hole are connected;

[0021] In the first quadrant, drilling a second slot hole along a second direction in a jump drill manner, wherein the first slot hole and the second slot hole are connected at their ends;

[0022] The intersection point of the ends of the first slot and the second slot and the intersection point of the ends of the third slot and the fourth slot are drilled to remove burrs.

[0023] As a further improvement of the present invention, the first slot hole and the fourth slot hole extend in the same direction, and the second slot hole and the third slot hole extend in opposite directions.

[0024] As a further improvement of the present invention, the aperture of the first slot is the same as the aperture of the second slot.

[0025] As a further improvement of the present invention, the length of the first slot hole is between 0.8 mm and 1.1 mm.

[0026] As a further improvement of the present invention, the length of the second slot is between 1.3 mm and 1.5 mm.

[0027] The beneficial technical effect of the present invention is as follows: the present invention first drills two guide holes, then expands the two guide holes, and then drills the first slot hole in the form of a jump drill, and at the same time, drills the second slot hole along the second direction, so that the ends of the first slot hole and the second slot hole are connected, and the first direction and the second direction are perpendicular to each other, and then drills at the intersection of the ends of the first slot hole and the second slot hole to completely remove burrs at the corners of the L-shaped slot hole, thereby improving the quality of the finished product. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The present invention is a flowchart of a method for processing an L-shaped slot hole.

[0029] Figure 2 yes Figure 1 The processing structure diagram of the L-shaped slot hole in the first quadrant.

[0030] Figure 3 yes Figure 1 The processing structure diagram of the L-shaped slot hole in the second quadrant.

[0031] Figure 4 It is a schematic diagram of the structure of the PCB board after the L-shaped slot is drilled.

[0032] Figure 5 Yes Figure 4 The schematic diagram of the structure of the PCB board after electroplating is shown.

[0033] Figure 6 Yes Figure 4 The schematic diagram of the PCB board shown is after mass production verification.

[0034] Figure 7 Yes Figure 4 The schematic diagram of the PCB board shown is after mass production verification.

[0035] Figure 8 Yes Figure 4 The schematic diagram of the PCB board shown is after mass production verification. DETAILED DESCRIPTION

[0036] In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the specific implementation methods of the present invention are further described in detail below in conjunction with the drawings and examples. The following examples are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0037] See also Figures 1 to 4 As shown, the present invention provides a method for processing an L-shaped slot hole, which is used for a PCB board 1 and includes the following steps:

[0038] Drilling two guide holes 2 opposite to each other on the PCB board 1;

[0039] Expanding the guide hole 2, and drilling a first slot 31 along a first direction in a jump drilling manner;

[0040] Drilling a second slot hole 32 along a second direction in a jump drilling manner, wherein the ends of the first slot hole 31 and the second slot hole 32 are connected, and the first direction and the second direction are perpendicular;

[0041] The intersection of the ends of the first slot 31 and the second slot 32 is drilled to remove burrs.

[0042] Preferably, the second slotted hole 32 takes one of the guide holes 2 as a starting point and extends in a direction away from the guide hole 2. That is, the first slotted hole 31 and the second slotted hole 32 are drilled with the same guide hole 2 as a starting point. Preferably, the hole length of the first slotted hole 31 is between 0.8 mm and 1.1 mm, and can be 0.9 mm, 1 mm, etc. The hole length of the second slotted hole 32 is between 1.3 mm and 1.5 mm, and can be 1.35 mm, 1.4 mm, 1.45 mm, etc.

[0043] In this embodiment, the first slot hole 31 is a short slot hole of the L-shaped slot hole, and the second slot hole 32 is a long slot hole of the L-shaped slot hole. That is to say, the short slot hole and the long slot hole are both drilled in the form of a jump drill, which can better control the heat and stress during the drilling process, help to improve the dimensional accuracy of the slot hole, and reduce the impact of thermal deformation and mechanical deformation during the drilling process on the accuracy of the slot hole. In the process of drilling the short slot hole, two drill bits of different specifications are required to realize the guide hole 2 and the expansion hole. The drill bit used for expansion and the drill bit used for jump drilling are preferably of the same specifications. The drill bit used to drill the long slot hole can have the same specifications as the drill bit used for the jump slot, or it can be different. This can be adjusted according to actual conditions and there is no limitation on this.

[0044] When the drill for drilling the long slotted hole has the same specification as the drill for drilling the slot, the diameter of the first slotted hole 31 is the same as the diameter of the second slotted hole 32. The rotation direction of the drill is preferably clockwise.

[0045] In this embodiment, the PCB board 1 is in a rectangular shape, the first direction is the short side direction of the PCB board 1 , and the second direction is the long side direction of the PCB board 1 .

[0046] The distance between the two guide holes 2 is the same as the length of the first slotted hole 31. That is, the length and position of the first slotted hole 31 are completely positioned by setting the two guide holes 2. In other embodiments, one guide hole 2 may be used as the starting point and the other guide hole 2 may be used as the middle point to continue drilling, and it is only necessary to ensure that the extension direction of the first slotted hole 31 is determined by the two guide holes 2.

[0047] The hole drilled at the intersection of the ends of the first slot hole 31 and the second slot hole 32 is defined as a deburring hole 35 , and the projection of the deburring hole 35 on the PCB board 1 at least partially overlaps with the projection of the first slot hole 31 and the second slot hole 32 on the PCB board.

[0048] In this embodiment, the burr-removing hole 35 is arranged near the corner of the first slot 31 and the second slot 32. That is, the burr-removing hole 35 is not drilled directly above the intersection of the ends of the first slot 31 and the second slot 32, but is offset toward the corner of the first slot 31 and the second slot 32. In this way, the burr-removing hole 35 can be partially integrated into the first slot 31 and the second slot 32 to completely eliminate the burrs at the corners of the first slot 31 and the second slot 32.

[0049] The axis of the PCB board 1 is defined as the center point, and a plane rectangular coordinate system is established with the center point as the origin to form four quadrants. There are at least four L-shaped slots and they are respectively located in the four quadrants.

[0050] Preferably, the order of the first slot hole 31 and the second slot hole 32 drilled in the first quadrant is the same as the order of the first slot hole 31 and the second slot hole 32 drilled in the third quadrant, and the order of the first slot hole 31 and the second slot hole 32 drilled in the second quadrant is the same as the order of the first slot hole 31 and the second slot hole 32 drilled in the fourth quadrant.

[0051] In this embodiment, the first quadrant and the third quadrant are preferentially drilled with the first slot 31, and then the second slot 32. The second quadrant and the fourth quadrant are preferentially drilled with the second slot 32, and then the first slot 31. This is because L-shaped slots can be drilled in the first quadrant and the second quadrant.

[0052] The steps of machining the L-shaped slot in the first quadrant and the second quadrant simultaneously include:

[0053] Drilling two guide holes 2 opposite to each other in the first quadrant and the second quadrant respectively;

[0054] Expanding the guide hole 2 located in the first quadrant, and drilling a first slot 31 along a first direction in a jump drilling manner;

[0055] Taking one of the guide holes 2 in the second quadrant as a starting point, a third slot hole 33 is drilled along the second direction in a jump drilling manner;

[0056] The guide hole 2 in the second quadrant is enlarged, and a fourth slot hole 34 is drilled along the first direction in the form of a jump drill, and the ends of the third slot hole 33 and the fourth slot hole 34 are connected;

[0057] In the first quadrant, a second slot hole 32 is drilled along a second direction in a jump drill manner, and ends of the first slot hole 31 and the second slot hole 32 are connected;

[0058] The intersection of the ends of the first slot hole 31 and the second slot hole 32 and the intersection of the ends of the third slot hole 33 and the fourth slot hole 34 are drilled to remove burrs.

[0059] That is, when drilling holes in the first quadrant and the second quadrant at the same time, different drill bits can be used alternately so that the L-shaped slot holes in the two quadrants are completed synchronously. In this way, there is no need to prepare multiple tools of the same specification.

[0060] Of course, it is also possible to drill holes simultaneously in the second and third quadrants, the third and fourth quadrants, and the first and fourth quadrants. Therefore, this operation step can also act on any two adjacent quadrants. In other embodiments, the tool change operation can also be performed in a sequential order, which is not limited to this.

[0061] Preferably, the first slot hole 31 and the fourth slot hole 34 extend in the same direction, and the second slot hole 32 and the third slot hole 33 extend in opposite directions.

[0062] See also Figure 5 As shown, in this embodiment, after the L-shaped slot is processed on the PCB board 1, it is electroplated and observed by the CCD module, and there is no burr on the L-shaped slot. Figure 6-Figure 8 As shown in the figure, through large-scale verification, it was determined that there were no burrs on the L-shaped slot hole, which can fully guarantee the quality of the finished product.

[0063] In summary, the present invention provides an L-shaped slot processing method by first drilling two relatively arranged guide holes 2 on a PCB board 1, then expanding the two guide holes 2, and then drilling a first slot 31 in the form of a jump drill, and at the same time, drilling a second slot 32 along a second direction, so that the ends of the first slot 31 and the second slot 32 are connected, and the first direction and the second direction are perpendicular to each other, and then drilling is performed at the intersection of the ends of the first slot 31 and the second slot 32 to completely remove the burrs at the corners of the L-shaped slot, thereby improving the quality of the finished product.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the technical principles of the present invention, and these improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A method for processing an L-shaped slot for a PCB board, characterized in that: The following steps are involved: Drilling two guide holes arranged opposite to each other on the PCB board; Expanding the guide hole and drilling a first slot hole along a first direction in a jump drilling manner; Drilling a second slot hole along a second direction in a jump drill manner, wherein ends of the first slot hole and the second slot hole are connected, and the first direction and the second direction are perpendicular; The intersection of the ends of the first slot and the second slot is drilled to remove burrs.

2. The method for processing an L-shaped slot according to claim 1, characterized in that: The distance between the two guide holes is the same as the length of the first slot.

3. The method for processing an L-shaped slot according to claim 1, characterized in that: The hole drilled at the intersection of the ends of the first slot hole and the second slot hole is defined as a burr repair hole, and the projection of the burr repair hole on the PCB board at least partially overlaps with the projection of the first slot hole and the second slot hole on the PCB board.

4. The method for processing an L-shaped slot according to claim 1, characterized in that: The axis of the PCB board is defined as the center point, and a plane rectangular coordinate system is established with the center point as the origin to form four quadrants. At least four L-shaped slots are provided and are respectively located in the four quadrants.

5. The method for processing an L-shaped slot according to claim 4, characterized in that: The order of the first slot and the second slot drilled in the first quadrant is the same as the order of the first slot and the second slot drilled in the third quadrant, and the order of the first slot and the second slot drilled in the second quadrant is the same as the order of the first slot and the second slot drilled in the fourth quadrant.

6. The method for processing an L-shaped slot according to claim 4, characterized in that: The steps of machining the L-shaped slot in the first quadrant and the second quadrant simultaneously include: Drilling two guide holes opposite to each other in the first quadrant and the second quadrant respectively; Expanding the guide hole in the first quadrant and drilling a first slot hole along a first direction in a jump drill manner; Taking one of the guide holes in the second quadrant as a starting point, drilling a third slot hole along the second direction in a jump drill manner; Expanding the guide hole in the second quadrant, and drilling a fourth slot hole along the first direction in the form of a jump drill, wherein the ends of the third slot hole and the fourth slot hole are connected; In the first quadrant, drilling a second slot hole along a second direction in a jump drill manner, wherein the first slot hole and the second slot hole are connected at their ends; The intersection point of the ends of the first slot and the second slot and the intersection point of the ends of the third slot and the fourth slot are drilled to remove burrs.

7. The method for processing an L-shaped slot according to claim 6, characterized in that: The first slot hole and the fourth slot hole extend in the same direction, and the second slot hole and the third slot hole extend in opposite directions.

8. The method for processing an L-shaped slot according to claim 1, characterized in that: The aperture of the first slot is the same as the aperture of the second slot.

9. The method for processing an L-shaped slot according to claim 1, characterized in that: The hole length of the first slot is between 0.8 mm and 1.1 mm.

10. The method for processing an L-shaped slot according to claim 1, characterized in that: The hole length of the second slot is between 1.3 mm and 1.5 mm.

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