A drill bit for drilling holes in PCB boards

Abstract

This application discloses a drill bit for drilling PCB boards, relating to the field of drill bit technology. It includes a body, one end of which is a drill tip. The body has a double-groove section and a single-groove section sequentially arranged from the drill tip end to the other end. The outer side of the body has a first spiral groove and a second spiral groove that spirally surround and intersect. The first spiral groove is located close to the drill tip, and the end of the first spiral groove away from the drill tip connects to the starting end of the second spiral groove near the drill tip. Using the technical solution provided in this application can avoid the problem of uneven chip removal during drilling, thereby making the drilling process smoother and increasing the number of holes drilled.

Description

Technical Field

[0001] This application relates to the field of drill bit technology, and more particularly to a drill bit for drilling holes in PCB boards. Background Technology

[0002] As electronic device motherboards become increasingly smaller and chips become more highly integrated and densely packed, higher demands are placed on the positional accuracy of the holes on printed circuit boards (PCBs) that connect to chip pins. In the field of micro-drilling, various factors affect the accuracy and quality of drill holes, such as drill bit rigidity, cross-sectional shape, and helical groove angle.

[0003] During the drilling process, the timely and effective removal of drilling debris has a significant impact on the drilling quality. If the debris removal is not smooth during drilling, the accumulated debris will firstly affect the smoothness of drilling, which may cause the drill bit to become cheap and result in poor drilling quality; secondly, the accumulated debris can easily cause excessive local heat in the drill bit during drilling, affecting the drilling quality and the service life of the drill bit.

[0004] In addition, during the drilling of long holes, if the length of the long hole is less than the sum of the diameters of the two holes, in actual drilling, two drilling operations are usually used to form the long hole. When forming the second hole, the limiting effect is lost due to its proximity to the first hole. If the cutting force of the drill bit is insufficient, the hole position is very likely to shift, which will ultimately affect the drilling quality. Summary of the Invention

[0005] The purpose of this application is to provide a drill bit for drilling holes in PCB boards to solve at least one of the above-mentioned technical problems.

[0006] To solve the above-mentioned technical problems, this application provides a drill bit for drilling PCB boards, including a body, one end of which is a drill tip; the body is provided with a double-groove section and a single-groove section from the drill tip end to the other end.

[0007] The outer side of the body is provided with a first spiral groove and a second spiral groove that spiral around and intersect. The first spiral groove is located close to the drill tip, and the end of the first spiral groove away from the drill tip is connected to the starting end of the second spiral groove near the drill tip.

[0008] In the above implementation process, this solution sets up spiral grooves at both ends. When the drill bit is drilling, the generated chips will first pass through the first spiral groove and then enter the second spiral groove. This solution cleverly designs the connection position between the first and second spiral grooves so that the end position of the first spiral groove is located on the side of the second spiral groove closer to the drill tip. In this way, the chip can be more smoothly transmitted during the process of being guided from the first spiral groove to the second spiral groove, thereby avoiding the problem of chip removal problems during the drilling process. At the same time, it can also effectively avoid the problem of excessive cutting temperature caused by chip blockage, thus making the drilling process smoother and laying a good foundation for improving drilling quality.

[0009] Preferably, the dual-slot segment includes two first single slots arranged side by side, and the single-slot segment includes a second single slot.

[0010] The width of the second single groove is greater than the width of the first single groove;

[0011] In the above implementation process, the initial solution adopts a double-groove design, which is then converted to a single-groove design. This effectively improves the rigidity of the drill bit, makes the drilling process more stable, and extends the service life of the drill bit.

[0012] Preferably, two symmetrical cutting surfaces are formed on the drill tip;

[0013] The cutting surface has an arc-shaped groove, as projected along the axial direction of the drill bit.

[0014] In the above implementation process, the cutting surface of a traditional drill bit with axial projection is generally straight. This solution further adjusts this part of the structure to form an arc-shaped groove structure at this position. Compared with a straight cutting surface, the arc-shaped cutting surface can distribute the force more evenly when subjected to force, thus improving the cutting force and further enhancing the cutting force of the drill bit.

[0015] Preferably, when slotting along the first spiral groove, a cutting edge is formed on both sides thereon, and a grinding surface is formed on the cutting edge;

[0016] In the above implementation process, traditional drill bits generally only have one cutting edge that has a cutting effect, while the other cutting edge is only formed incidentally during the grooving process of the spiral groove. This solution can effectively enhance the cutting edge with weak cutting force by forming a grinding surface on the cutting edge, thereby enhancing the overall cutting force of the drill bit.

[0017] Preferably, the polishing surface occupies 1 / 4 to 1 / 2 of the first spiral groove along the axial direction of the body;

[0018] In the above implementation process, it is understandable that the machining process of forming a grinding surface on the cutting edge is relatively complex. This solution adopts a partial grinding method to ensure that it has sufficient cutting force while reducing the machining difficulty to a certain extent, thereby reducing the production cost of the drill bit.

[0019] Preferably, the main body is provided with a first large head section, a middle section, and a second large head section in sequence from one end of the drill tip to the other.

[0020] With the projection of the body axis, the diameter of the first large end section is greater than that of the middle section, and the diameter of the second large end section is greater than that of the middle section.

[0021] In the above implementation process, this solution adopts a double-large-head design, with a large head near the drill tip and a large head near the shank, while the diameter in the middle is slightly smaller. This can enhance the rigidity of the drill bit and enable it to achieve better drilling.

[0022] Preferably, the helix angle of the first helical groove increases either non-amplitude or amplitude.

[0023] In the above implementation process, it is understood that the first helical groove maintains a certain helix angle within a certain length range, and as its length increases to another range, the helix angle increases, but the amount of increase in the helix angle is not proportional to the amount of increase in the distance range, which is a non-amplitude increase; while in this scheme, the helix angle of the first helical groove can be increased in an amplitude manner, that is, as the distance of the helical groove from the drill tip gradually increases, the helix angle of the first helical groove also gradually increases, and the amount of increase in the helix angle is proportional to the distance of the helical groove from the drill tip.

[0024] Preferably, the helix angle at the starting point of the second helical groove is 46°±6°.

[0025] Preferably, the drill tip angle is 150°±3°.

[0026] Preferably, the core thickness of the body is 0.12-0.14 mm.

[0027] Compared with the prior art, the beneficial effects of this application are as follows: This solution sets up spiral grooves at both ends. When the drill bit is drilling, the generated chips will first pass through the first spiral groove and then enter the second spiral groove. This solution cleverly designs the connection position between the first and second spiral grooves so that the end position of the first spiral groove is located on the side of the second spiral groove closer to the drill tip. In this way, the chip can be more smoothly transmitted during the process of being guided from the first spiral groove to the second spiral groove, thereby avoiding the problem of chip removal problems during the drilling process. At the same time, it can also effectively avoid the problem of excessive cutting temperature caused by chip blockage, thus making the drilling process smoother and laying a good foundation for improving drilling quality. Attached Figure Description

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

[0029] Figure 1 This is a schematic diagram of the overall structure of one embodiment of this application;

[0030] Figure 2 This is a partial structural schematic diagram of one embodiment of this application;

[0031] Figure 3 This is a partial structural schematic diagram of one embodiment of this application;

[0032] Figure 4 This is a schematic diagram of the drill tip from one embodiment of this application;

[0033] Wherein: 10, body; 11, first spiral groove; 111, first single groove; 12, second spiral groove; 121, second single groove; 21, first large end section; 22, second large end section; 23, intermediate section; 31, cutting surface; 40, cutting edge; 41, grinding surface; A1, double groove section; A2, single groove section. Detailed Implementation

[0034] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0035] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0036] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between the components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0037] In the description of this application, it should be understood that the terms "upper", "lower", "side", "front", "rear", etc., indicate the orientation or positional relationship based on the installation orientation or positional relationship, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0038] In the description of this application, it should be noted that the term "and / or" is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0039] It should also be noted that in the embodiments of this application, the same reference numerals are used to represent the same component or part. For the same part in the embodiments of this application, the reference numerals may only be used to mark one part or component as an example in the figure. It should be understood that the reference numerals are also applicable to other identical parts or components.

[0040] To further understand the invention's content, features, and effects, the following embodiments are provided, along with detailed descriptions in conjunction with the accompanying drawings:

[0041] Example

[0042] During drilling, the timely and effective removal of drilling debris has a significant impact on drilling quality. If debris removal is not smooth during drilling, the accumulated debris will firstly affect the smoothness of drilling, potentially causing the drill bit to become cheap and resulting in poor drilling quality; secondly, the accumulated debris can easily cause excessive localized heat in the drill bit during drilling, affecting drilling quality and the lifespan of the drill bit. To solve this technical problem, this embodiment provides the following technical solution:

[0043] Please see Figure 1-4 This embodiment provides a drill bit for drilling holes in PCB boards, which includes a body and a drill tip at one end of the body;

[0044] For details, please see Figure 1 The main body is provided with a double-groove section and a single-groove section from one end of the drill tip to the other.

[0045] For further details, please see Figure 2 The outer side of the body is provided with a first spiral groove and a second spiral groove that spiral around and intersect. The first spiral groove is located close to the drill tip, and the end of the first spiral groove away from the drill tip is connected to the starting end of the second spiral groove near the drill tip.

[0046] Understandably, the traditional double-groove design, when converted to a single-groove design, did not properly handle the connection between the two grooves. This caused the chips to easily become clogged during transmission, and the poor chip removal caused excessively high local cutting temperatures, ultimately affecting the drilling quality.

[0047] In this design, when the drill bit is drilling, the resulting chips first pass through the first helical groove and then enter the second helical groove. This design cleverly positions the first and second helical grooves so that the end of the first helical groove is located precisely on the side of the second helical groove closest to the drill tip. This allows for smoother chip transfer from the first to the second helical groove, preventing chip removal problems during drilling and effectively avoiding excessive cutting temperature caused by chip blockage. This results in a smoother drilling process and lays a solid foundation for improved drilling quality.

[0048] For details, please see Figure 2 The double-slot section includes two first single slots arranged side by side, and the single-slot section includes a second single slot.

[0049] The width of the second single groove is greater than the width of the first single groove.

[0050] In the above scheme, the initial design adopts a double-groove design, which is then converted into a single-groove design. This can effectively improve the rigidity of the drill bit, make the drilling process more stable, and extend the service life of the drill bit.

[0051] For details, please see Figure 4 Two symmetrical cutting surfaces are formed on the drill tip;

[0052] Among them, the cutting surface has an arc groove formed by the axial projection of the drill bit;

[0053] In the above implementation process, the cutting surface of a traditional drill bit with axial projection is generally straight. This solution further adjusts this part of the structure to form an arc-shaped groove structure at this position. Compared with a straight cutting surface, the arc-shaped cutting surface can distribute the force more evenly when subjected to force, thus improving the cutting force and further enhancing the cutting force of the drill bit.

[0054] Understandably, in traditional drill bits, the formation of grooves is accompanied by the formation of a cutting edge. However, in practical applications, the cutting function is mainly concentrated on the cutting edge of the drill tip, resulting in poor overall lateral cutting force. In some applications, such as machining a long hole by using two drilling positions, when drilling the second hole, since the first hole has already been formed, one side of the drill bit is empty, and only the other side has material. If drilling is performed solely by the cutting edge of the drill tip, the insufficient lateral cutting force can easily lead to incomplete hole positioning, ultimately resulting in poor quality long holes that fail to meet standards and have a low yield. To solve this technical problem, this embodiment provides the following technical solution:

[0055] For details, please see Figure 2 When the groove is cut along the first spiral groove, a cutting edge is formed on both sides, and a grinding surface is formed on the cutting edge;

[0056] In the above solution, traditional drill bits typically have only one cutting edge that has a cutting effect, while the other cutting edge is formed incidentally during the spiral groove grooving process. This solution, by forming a grinding surface on this cutting edge, can effectively enhance the originally weak cutting edge, thereby increasing the overall cutting force of the drill bit. It can be understood that the side cutting force of the drill hole is strengthened, thus effectively improving drilling accuracy and improving the yield rate when encountering the above-mentioned continuous drilling situation.

[0057] Furthermore, the polished surface occupies 1 / 4 to 1 / 2 of the first spiral groove along the axial direction of the body;

[0058] In the above scheme, it is understandable that the machining process of forming a grinding surface on the cutting edge is relatively complex. This scheme adopts a partial grinding method, which can reduce the machining difficulty to a certain extent while ensuring that it has sufficient cutting force, thereby reducing the production cost of the drill bit.

[0059] For details, please see Figure 3The main body is provided with a first large section, a middle section, and a second large section in sequence from one end of the drill tip to the other.

[0060] Furthermore, when projected along the body axis, the diameter of the first large end section is greater than that of the middle section, and the diameter of the second large end section is greater than that of the middle section.

[0061] In the above scheme, this scheme adopts a double-large-head design, in which the part near the drill tip is large and the part near the shank is large, while the diameter in the middle is slightly smaller. This can enhance the rigidity of the drill bit and enable it to achieve better drilling.

[0062] In some embodiments, the helix angle of the first helical groove increases either non-amplitude or amplitude.

[0063] In the above scheme, it is understood that the first helical groove maintains a certain helix angle within a certain length range, and as its length increases to another range, the helix angle increases, but the amount of increase in the helix angle is not proportional to the amount of increase in the distance range, which is a non-amplitude increase; while in this scheme, the helix angle of the first helical groove can be increased in an amplitude manner, that is, as the distance of the helical groove from the drill tip gradually increases, the helix angle of the first helical groove also gradually increases, and the amount of increase in the helix angle is proportional to the distance of the helical groove from the drill tip.

[0064] The helix angle described in this embodiment can be referenced. Figure 2 R2 as shown;

[0065] Furthermore, in some embodiments, the helix angle is 40°±3° when the first helical groove is 1.00-1.30mm, and 46°±3° when it is 1.30-1.45mm.

[0066] Specifically, in some embodiments, the helical angle at the starting point of the second helical groove is 46°±6°.

[0067] Specifically, in some embodiments, the drill tip angle is 150°±3°; where the drill tip angle can be referenced. Figure 2 R1 in the middle.

[0068] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0069] The above description is merely a preferred embodiment of this application and is not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application shall fall within the scope of the technical solution of this application.

Claims

1. A drill bit for drilling holes in PCB boards, characterized in that: The body includes a drill bit at one end; the body is provided with a double-groove section and a single-groove section from the drill bit end to the other end. The outer side of the body is provided with a first spiral groove and a second spiral groove that spiral around and intersect. The first spiral groove is located close to the drill tip, and the end of the first spiral groove away from the drill tip is connected to the starting end of the second spiral groove near the drill tip. The dual-slot segment includes two first single slots arranged side by side, and the single-slot segment includes a second single slot. The width of the second single groove is greater than the width of the first single groove; Two symmetrical cutting surfaces are formed on the drill tip; The cutting surface is formed with an arc-shaped groove when the drill bit is projected axially. When slotting along the first spiral groove, a cutting edge is formed on both sides of it, and a grinding surface is formed on the cutting edge; The polishing surface occupies 1 / 4 to 1 / 2 of the first spiral groove along the axial direction of the body.

2. The drill bit for drilling holes in a PCB board according to claim 1, characterized in that: The main body is provided with a first large section, a middle section, and a second large section in sequence from one end of the drill tip to the other. Projected along the axial direction of the body, the diameter of the first large end segment is greater than that of the middle segment, and the diameter of the second large end segment is greater than that of the middle segment.

3. The drill bit for drilling holes in a PCB board according to claim 2, characterized in that: The helix angle of the first helical groove is either non-amplitude or increases in amplitude.

4. The drill bit for drilling holes in a PCB board according to claim 3, characterized in that: The helical angle at the starting point of the second helical groove is 46°±6°.

5. The drill bit for drilling holes in a PCB board according to claim 4, characterized in that: The drill tip angle is 150°±3°.

6. The drill bit for drilling holes in a PCB board according to claim 5, characterized in that: The core thickness of the body is 0.12-0.14m.

Images