CN115243466A - Depth control drill and PCB back drilling depth control method - Google Patents
Depth control drill and PCB back drilling depth control method Download PDFInfo
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- CN115243466A CN115243466A CN202210949971.5A CN202210949971A CN115243466A CN 115243466 A CN115243466 A CN 115243466A CN 202210949971 A CN202210949971 A CN 202210949971A CN 115243466 A CN115243466 A CN 115243466A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/22—Secondary treatment of printed circuits
- H05K3/225—Correcting or repairing of printed circuits
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/0011—Working of insulating substrates or insulating layers
- H05K3/0044—Mechanical working of the substrate, e.g. drilling or punching
- H05K3/0047—Drilling of holes
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- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
Abstract
The invention relates to the technical field of PCBs (printed circuit boards), and discloses a depth control drill and a PCB back drilling depth control method. The depth control drill comprises a drill handle, a drill neck and a cutter body, wherein the cutter body comprises a guide part and a drill tip; the depth-control drilling tool also comprises a baffle part; the blocking part is arranged at a preset height position on the drill neck or the cutter body, so that the length of the cutter body between the bottom surface of the blocking part and the end surface of the drill tip is the target drilling depth, and the projection of the blocking part on the back drilling surface of the PCB is not overlapped with the corresponding back drilling hole in the back drilling working state. According to the embodiment of the invention, when the partition part moves downwards along with the cutter body to the height position of the back drilling surface of the PCB, the partition part can be abutted against the back drilling surface, so that the cutter body is prevented from moving downwards continuously, and the actual drilling depth of the cutter body in the PCB is the vertical distance between the bottom surface of the partition part and the end surface of the drill point, namely the preset target drilling depth. Therefore, the invention can simply and accurately control the back drilling depth to reach the target drilling depth.
Description
Technical Field
The invention relates to the technical field of Printed Circuit Boards (PCBs), in particular to a depth control drill and a PCB back drilling depth control method.
Background
With the technical development of 5G wireless networks, communication products have higher and higher requirements on high frequency and high speed of PCBs. In the PCB manufacturing process, the back drilling is already a key process in the circuit board manufacturing process because the purpose of the back drilling is to "remove the redundant via copper of the signal layer of the metalized through hole, reduce the signal loss, and avoid the signal distortion", and how to improve the control precision of the back drilling depth in the key process is particularly critical, however, the control of the back drilling depth with high precision cannot be realized at present.
Disclosure of Invention
The invention aims to provide a depth control drill and a PCB back drilling depth control method, so as to overcome the defect of low back drilling depth control precision in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a depth control drill cutter comprises a drill handle, a drill neck and a cutter body which are sequentially arranged along the length direction, wherein the cutter body comprises a guide part and a drill tip, the guide part is connected between the drill neck and the drill tip, and the depth control drill cutter also comprises a blocking part;
the blocking part is arranged at a preset height position on the drill neck or the cutter body, so that the length of the cutter body between the bottom surface of the blocking part and the end surface of the drill tip is the target drilling depth, and the projection of the blocking part on the back drilling surface of the PCB is not overlapped with the corresponding back drilling hole in the back drilling working state.
Optionally, the barrier portion includes a body and a contact portion disposed at the bottom of the body;
and the contact part is used for being in contact and electrical connection with the conducting layer of the back drilling surface of the PCB or being in contact with the pressure sensor of the back drilling surface of the PCB.
Optionally, the body is sleeved on the drill neck or the periphery of the guide portion.
Optionally, the contact portion is convexly arranged on the bottom surface of the body, and a preset gap is formed between the contact portion and the guide portion.
Optionally, the contact portion is an integrally formed hollow structure with a planar contact surface, and the hollow structure is uniformly arranged around the periphery of the guide portion.
Optionally, at least two mounting positions are arranged on the outer side of the guide part along the length direction of the guide part, and each mounting position corresponds to different target drilling depths;
the baffle part is detachably arranged at an installation position corresponding to the current target drilling depth.
A PCB back drilling depth control method comprises the following steps:
providing a PCB with a metalized through hole;
applying the depth control drill bit as described in any one of the above, and back drilling from the back drilling surface of the PCB at the corresponding position of the metalized through hole;
and when the stop part is recognized to descend to be in contact with the back drilling surface of the PCB, controlling the depth control drilling cutter to stop back drilling.
Optionally, a conductive layer is arranged on the back drilling surface of the PCB; the barrier part comprises a body and a contact part arranged at the bottom of the body, and the contact part is used for being in contact electrical connection with a conductive layer of the back drilling surface of the PCB;
the method for identifying whether the separation part descends to be in contact with the back drilling surface of the PCB comprises the following steps: and in the drilling process, detecting the electric conduction state between the contact part and the conductive layer in real time, and judging that the baffle part descends to be in contact with the back drilling surface of the PCB when the electric conduction state is switched to short circuit from open circuit.
Optionally, a pressure sensor is arranged at a projection position of the back drilling surface of the PCB on the barrier part; the barrier part comprises a body and a contact part arranged at the bottom of the body; the contact part is used for contacting with a pressure sensor drilled on the back of the PCB;
the method for identifying whether the separation part descends to be in contact with the back drilling surface of the PCB comprises the following steps: and detecting the pressure value of the pressure sensor in real time, and judging that the baffle part descends to contact with the back drilling surface of the PCB when the pressure value is increased sharply.
Optionally, the back drilling surface of the PCB is further provided with a protective layer.
Compared with the prior art, the invention has the following beneficial effects:
according to the embodiment of the invention, the specific installation height position of the blocking part on the drill bit can be set according to the target drilling depth, so that the length of the part, positioned between the bottom surface of the blocking part and the end surface of the drill tip, of the cutter body is ensured to be the target drilling depth. Because the projection of the blocking part falls into the board surface area (non-back drilling area) of the back drilling surface of the PCB, when the blocking part moves downwards along with the cutter body to the height position of the back drilling surface of the PCB, the blocking part can be abutted against the back drilling surface of the PCB, so that the cutter body is prevented from moving downwards continuously, and the current actual drilling depth of the cutter body in the PCB is the vertical distance between the bottom surface of the blocking part and the end surface of the drill tip, namely the preset target drilling depth. Therefore, based on the depth control drill tool, the back drilling depth can be simply and accurately controlled to reach the target drilling depth only by designing the installation position of the baffle part according to the target drilling depth.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a depth-control drill according to an embodiment of the present invention.
Fig. 2 is a schematic view of an application method of the depth-control drill according to an embodiment of the present invention.
Fig. 3 is a flowchart of a PCB back drilling depth control method according to an embodiment of the present invention.
Description of reference numerals: the depth control drill bit 1, the drill shank 11, the guide part 12, the drill tip 13, the barrier part 14, the body 141, the contact part 142 and the PCB 2.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to improve the depth control precision of back drilling, the embodiment of the invention provides a depth control drill bit 1, and the depth control drill bit 1 can accurately realize the depth control of back drilling when being applied to back drilling. Referring to fig. 1 and 2, a depth control drill 1 according to an embodiment of the present invention includes: the drill comprises a drill handle 11, a drill neck and a cutter body which are sequentially arranged along the length direction, wherein the cutter body comprises a guide part 12 and a drill tip 13, and the guide part 12 is connected between the drill neck and the drill tip 13.
Wherein, the drill handle 11 is a part for clamping on the depth-controlling drill bit 1 and is used for transmitting power (torque and axial force) required by drilling; the drill neck is a transition part between the drill handle 11 and the cutter body; the drill body, which is the working part of the depth-control drill 1, is composed of a drill tip 13 (i.e., a cutting part) and a guide part 12.
Different from the traditional drill structure, the depth-control drill 1 of the embodiment of the invention further comprises a blocking part 14, wherein the blocking part 14 is arranged at a preset height position on the drill neck or the cutter body, so that the length of the part of the cutter body, which is positioned between the bottom surface of the blocking part 14 and the end surface of the drill tip 13, is the target drilling depth, and the projection of the blocking part 14 on the back drilling surface of the PCB2 does not coincide with the corresponding back drilling hole in the back drilling working state.
In the embodiment of the present invention, the specific installation height position of the stopper portion 14 on the drill bit may be set according to the target drilling depth, so as to ensure that the length of the portion of the cutter body between the bottom surface of the stopper portion 14 and the end surface of the drill tip 13 is the target drilling depth. Because the projection of the blocking part 14 falls into the board area (non-back drilling area) of the back drilling surface of the PCB2, when the blocking part 14 moves down to the height position of the back drilling surface of the PCB2 along with the cutter body, the blocking part 14 will be in contact with the back drilling surface of the PCB2, so as to prevent the cutter body from moving down, and the actual drilling depth of the cutter body in the PCB2 at present is the vertical distance between the bottom surface of the blocking part 14 and the end surface of the drill tip 13, that is, the preset target drilling depth. Therefore, based on the depth-control drill 1, the back drilling depth can be simply and accurately controlled to reach the target drilling depth by only designing the installation position of the stopper portion 14 according to the target drilling depth.
In an alternative embodiment, the barrier portion 14 includes a body 141 and a contact portion 142 provided at the bottom of the body 141; the contact portion 142 is used for electrical connection with a conductive layer of the back-drilled surface of the PCB2 or contact with a pressure sensor of the back-drilled surface of the PCB 2.
As the contact portion 142 descends to contact with the conductive layer on the back-drilled surface, the electrical conduction state between the contact portion 142 and the conductive layer is switched from open circuit to short circuit; or the pressure sensor pressure measurement may surge (i.e., increase rapidly) as the contact portion 142 descends into contact with the pressure sensor at the back-drilled surface. Therefore, in this embodiment, under the cooperation of the contact portion 142 and the conductive layer/pressure sensor, it can be automatically, quickly and accurately identified whether the blocking portion 14 moves downward with the cutter body to contact with the back drilling surface of the PCB2, and then the back drilling is automatically controlled to stop, so as to prevent the depth-controlling drill 1 from being further rotated to damage the surface of the PCB2 after the downward movement is limited.
The body 141 may be fitted around the drill neck or the guide portion 12, so that a simple and quick assembly is achieved. The contact portion 142 is protruded from the bottom surface of the body 141, and a predetermined gap is formed between the contact portion 142 and the guide portion 12. This avoids interference between the contact portion 142 and the guide portion 12 due to the tightness, while ensuring drilling quality and control accuracy. Of course, in other embodiments, the body 141 may be mounted in various other conventional manners.
Illustratively, the contact portion 142 is an integrally formed hollow structure with a planar contact surface, and is uniformly arranged around the periphery of the guide portion 12, so as to effectively improve the detection accuracy of detecting whether the barrier portion 14 is in contact with the back-drilling surface.
In order to improve the universality of the depth-control drill cutter 1, at least two mounting positions are arranged on the outer side of the guide part 12 along the length direction of the guide part, and each mounting position corresponds to different target drilling depths; the stopper portion 14 is detachably mounted at a mounting position corresponding to the current target drilling depth. Based on this, before the application, can be according to the target drilling depth of present setting, come the installation position of the spacer portion 14 of selection matching, satisfied different drilling depth demands.
Referring to fig. 3, an embodiment of the present invention further provides a PCB2 back drilling depth control method, including:
And 102, applying the depth control drill 1 to perform back drilling from the back drilling of the PCB2 to the drilling surface at the corresponding position of the metalized through hole.
The depth control drill 1 in this step includes: the drill comprises a drill handle 11, a drill neck and a cutter body which are sequentially arranged along the length direction, wherein the cutter body comprises a guide part 12 and a drill tip 13, and the guide part 12 is connected between the drill neck and the drill tip 13; the drilling tool further comprises a blocking part 14, wherein the blocking part 14 is installed at a preset height position on the drill neck or the tool body, so that the length of the part, located between the bottom surface of the blocking part 14 and the end surface of the drill tip 13, of the tool body is the target drilling depth, and the projection of the blocking part 14 on the back drilling surface of the PCB2 does not coincide with the corresponding back drilling hole in the back drilling working state.
And 103, identifying whether the baffle part 14 descends to contact with the back drilling surface of the PCB2 in real time in the back drilling process, and controlling the depth control drill 1 to stop back drilling if the baffle part is in contact with the back drilling surface of the PCB 2.
Compared with the traditional drill bit structure, the depth control drill bit 1 provided by the embodiment of the invention further comprises a baffle part 14 arranged at a preset height position on the drill neck/the bit body, the baffle part 14 can be contacted with the PCB2 board surface when descending to the height position of the PCB2 board surface, so that the bit body is prevented from continuously descending, and at the moment, the length of the bit body which has drilled into the PCB2 is the vertical distance from the bottom surface of the baffle part 14 to the end surface of the drill tip 13, namely the preset target drilling depth. Therefore, the embodiment of the present invention only needs to design the installation position of the stopper portion 14 according to the target drilling depth, and the back drilling depth can be simply and accurately controlled to reach the target drilling depth.
In order to avoid damage to the surface of the PCB2 due to continuous rotation of the depth-controlling drill 1 after the downward movement is limited, the embodiment of the invention provides two effective solutions to automatically identify whether the downward movement is limited, so that the back drilling stop is rapidly controlled, and the adverse acting force applied by the depth-controlling drill 1 to the surface of the PCB2 is effectively reduced.
The first solution is:
a conductive layer is arranged on the back drilling surface of the PCB 2; the barrier part 14 comprises a body 141 and a contact part 142 arranged at the bottom of the body 141, wherein the contact part 142 is used for contacting and electrically connecting with a conductive layer of the back drilling surface of the PCB 2; the conductive layer can be an aluminum sheet or conductive adhesive.
Based on this, the method of identifying whether the spacer portion 14 is lowered into contact with the back-drilled surface of the PCB2 includes: during the drilling process, the electric conduction state between the contact part 142 and the conductive layer is detected in real time, and when the electric conduction state is switched from open circuit to short circuit, the baffle part 14 is judged to have descended to be in contact with the back drilling surface of the PCB 2.
The second solution is:
a pressure sensor is arranged at the projection position of the back drilling surface of the PCB2 on the barrier part 14; the barrier portion 14 includes a body 141 and a contact portion 142 disposed at the bottom of the body 141; a contact portion 142 for contacting a pressure sensor of the back-drilled drilling surface of the PCB 2.
Based on this, the method of identifying whether the standoff portion 14 descends into contact with the back-drilled surface of the PCB2 includes: and detecting the pressure value of the pressure sensor in real time, and judging that the barrier part 14 descends to contact with the back drilling surface of the PCB2 when the pressure value is increased sharply.
In this way, the back-drilling surface of the PCB2 may be additionally provided with a protective layer for protecting the back-drilling surface.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A depth-control drilling tool comprises a drill handle (11), a drill neck and a tool body which are sequentially arranged along the length direction, wherein the tool body comprises a guide part (12) and a drill tip (13), the guide part (12) is connected between the drill neck and the drill tip (13), and the depth-control drilling tool is characterized in that,
the depth control drill (1) further comprises a baffle part (14);
the blocking part (14) is arranged at a preset height position on the drill neck or the cutter body, so that the length of the cutter body between the bottom surface of the blocking part (14) and the end surface of the drill tip (13) is the target drilling depth, and the projection of the blocking part (14) on the back drilling surface of the PCB (2) is not overlapped with the corresponding back drilling hole in the back drilling working state.
2. The depth-control drill bit according to claim 1, wherein the stopper (14) comprises a body (141) and a contact portion (142) provided at the bottom of the body (141);
the contact part (142) is used for being in contact electrical connection with a conductive layer of the back drilling surface of the PCB (2) or in contact with a pressure sensor of the back drilling surface of the PCB (2).
3. The depth-controlling drill bit as claimed in claim 2, wherein the body (141) is sleeved on the periphery of the drill neck or the guide portion (12).
4. The depth-control drill insert as claimed in claim 3, wherein the contact portion (142) is protruded from a bottom surface of the body (141), and a predetermined gap is formed between the contact portion (142) and the guide portion (12).
5. The depth-control drill bit as claimed in claim 4, wherein the contact portion (142) is a hollow structure with a plane contact surface, and is uniformly arranged around the periphery of the guide portion (12).
6. The depth-control drill bit according to claim 1, characterized in that the outer side of the guide part (12) is provided with at least two mounting positions along the length direction thereof, and each mounting position corresponds to different target drilling depths;
the blocking part (14) is detachably arranged at an installation position corresponding to the current target drilling depth.
7. A PCB back drilling depth control method is characterized by comprising the following steps:
providing a PCB (2) with a metalized through hole;
applying the depth-controlling drilling tool (1) according to any one of claims 1 to 6, back-drilling from the back-drilled drilling surface of the PCB (2) at the corresponding position of the metallized through hole;
and controlling the depth control drilling cutter (1) to stop back drilling when the stop part (14) is recognized to descend to be in contact with the back drilling surface of the PCB (2).
8. The PCB back-drilling depth control method according to claim 7, wherein the back-drilling surface of the PCB (2) is provided with a conductive layer; the baffle part (14) comprises a body (141) and a contact part (142) arranged at the bottom of the body (141), and the contact part (142) is used for being in contact and electric connection with a conductive layer of a back drilling surface of the PCB (2);
the method of identifying whether the standoff portion (14) is lowered into contact with the back-drilled surface of the PCB (2) comprises: and detecting the electric conduction state between the contact part (142) and the conductive layer in real time during the drilling process, and judging that the baffle part (14) descends to be in contact with the back drilling surface of the PCB (2) when the electric conduction state is switched from open circuit to short circuit.
9. The PCB back-drilling depth control method according to claim 7, wherein a pressure sensor is arranged at the projection position of the back-drilling surface of the PCB (2) on the barrier part (14); the baffle part (14) comprises a body (141) and a contact part (142) arranged at the bottom of the body (141); the contact part (142) is used for contacting with a pressure sensor of a back drilling surface of the PCB (2);
the method of identifying whether the kicker (14) is down into contact with the backdrilling surface of the PCB (2) comprises: and detecting the pressure value of the pressure sensor in real time, and judging that the barrier part (14) descends to contact with the back drilling surface of the PCB (2) when the pressure value is increased sharply.
10. The PCB back-drilling depth control method according to claim 9, wherein the back-drilling surface of the PCB (2) is further provided with a protective layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210949971.5A CN115243466A (en) | 2022-08-09 | 2022-08-09 | Depth control drill and PCB back drilling depth control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210949971.5A CN115243466A (en) | 2022-08-09 | 2022-08-09 | Depth control drill and PCB back drilling depth control method |
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| Publication Number | Publication Date |
|---|---|
| CN115243466A true CN115243466A (en) | 2022-10-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210949971.5A Pending CN115243466A (en) | 2022-08-09 | 2022-08-09 | Depth control drill and PCB back drilling depth control method |
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| CN (1) | CN115243466A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117943682A (en) * | 2024-03-27 | 2024-04-30 | 广州广合科技股份有限公司 | Laser guiding and mechanical drilling processing method |
-
2022
- 2022-08-09 CN CN202210949971.5A patent/CN115243466A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117943682A (en) * | 2024-03-27 | 2024-04-30 | 广州广合科技股份有限公司 | Laser guiding and mechanical drilling processing method |
| CN117943682B (en) * | 2024-03-27 | 2024-06-04 | 广州广合科技股份有限公司 | Laser guiding and mechanical drilling processing method |
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