A multi-layer coating deposition PCB micro drill bit and coating growth method

Abstract

The present invention discloses a multi-layer coating deposition PCB micro drill bit and a coating growth method, relating to the field of micro drill bits. The micro drill bit comprises a drill shank and a drill rod. A threaded sleeve is slidably connected to the drill shank, a limit block is fixed at equal angles on the outside of the threaded sleeve, the limit block is slidably connected to the drill shank, a first spring is installed between the threaded sleeve and the drill shank, the threaded sleeve is threadedly connected to a threaded joint, and a limit rod is fixed at the upper end of the threaded joint. The multi-layer coating deposition PCB micro drill bit and the coating growth method adopt a combined elastic connection mechanism. During the use of the drill bit, the initial contact between the drill rod and the workpiece is flexible, avoiding excessive force on the drill rod and the workpiece when the drill rod moves downward too quickly, thus effectively extending the service life of the drill rod. The drill rod can also be replaced when damaged, making the drill shank reusable and effectively reducing the cost of the drill bit.

Description

Technical Field

[0001] The present invention relates to the technical field of micro drill bits, in particular to a multi-layer coating deposition PCB micro drill bit and a coating growth method. Background Art

[0002] Drill bits with a diameter of less than 3.175mm are usually called micro drill bits, or micro drills for short. In actual use, due to their small diameter, in order to ensure the strength of the drill bit, a coating needs to be attached to the surface of the drill bit to change the physical properties of the drill bit and ensure the strength of the drill bit during use;

[0003] Existing micro drills are generally of an integrated structure. In actual use, the initial contact between the drill and the workpiece is rigid contact. During the processing, when the drill moves down too fast, it is very easy to cause the drill to break, thereby affecting the normal processing. Summary of the Invention

[0004] The object of the present invention is to provide a multi-layer coating deposition PCB micro drill bit and a coating growth method to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a multi-layer coating deposited PCB micro drill bit, comprising a drill shank and a drill rod, a threaded sleeve being slidably connected inside the drill shank, a limit block being fixed at equal angles on the outside of the threaded sleeve, a sliding connection being formed between the limit block and the drill shank, a first spring being installed between the threaded sleeve and the drill shank, a threaded connection being formed between the threaded sleeve and the threaded joint, a limit rod being fixed at the upper end of the threaded joint, a nested connection being formed between the limit rod, the threaded sleeve and the drill shank, and the central axis of the limit rod, the central axis of the threaded sleeve and the drill shank being coincident, a drill rod being fixed at the lower end of the threaded joint, and a coating being provided on the surface of the drill rod.

[0006] A coating growth method for a multi-layer coating deposition PCB micro drill bit comprises the following steps:

[0007] S1: Drill bit surface treatment stage: the drill bit is placed in an ultrasonic cleaning device to effectively treat debris and oil stains on the drill bit surface;

[0008] S2: Coating growth preparation stage: Install the drill bit in the magnetron sputtering chamber, install the target material, and use the vacuum pump to evacuate the magnetron sputtering chamber until the vacuum degree is ≤5×10 -4 Pa, and introduce 0.1-10Pa of argon into the magnetron sputtering chamber;

[0009] S3: Coating growth stage: The magnetron sputtering machine works to make the atoms on the target surface gain energy and sputter and adhere to the surface of the drill bit, thus forming a coating;

[0010] S4: Cooling stage: After the coating of the drill bit is completed, it needs to be cooled by a water cooling device to eliminate the coating stress and ensure the coating adhesion effect;

[0011] S5: Repeat the above steps S2, S3 and S4, and replace the target material in the S2 stage, so that a multi-layer coating structure can be formed on the surface of the drill bit.

[0012] Preferably, the water cooling device includes a water cooling box, a first water pump is installed at the front end of the right side of the water cooling box, and the first water pump is connected to the first water inlet pipe, and the first water inlet pipe is connected to the cooling water tank through a conduit, a first water outlet pipe is installed at the front end of the left side of the first water inlet pipe, and a control valve is installed on the first water outlet pipe, and the first water outlet pipe is connected to the cooling water tank through a conduit, a temperature sensor is installed on the inner wall of the water cooling box, and an annular frame is fixed to the lower end of the inner side of the water cooling box. Through the above structure, the circulation of cooling water can be realized, thereby providing basic guarantee for the cooling of the drill bit.

[0013] Preferably, a water temperature regulating mechanism is installed in the water cooling box, and the water temperature regulating mechanism includes a second water pump and a second water outlet pipe, and the second water pump is fixed on the water cooling box, and the second water pump is connected to the second water inlet pipe fixed on the water cooling box, and the second water pump is connected to the cooling water tank through a conduit, and the second water outlet pipe is fixed on the water cooling box, and the second water outlet pipe is connected to the cooling water tank through a conduit, and a cross bar is provided in the second water outlet pipe, and the cross bar and the second water inlet pipe are slidably connected, one end of the cross bar is fixed with a first sealing plug slidably connected to the second water inlet pipe, and one end of the cross bar is fixed with a second sealing plug slidably connected to the second water outlet pipe, and a second spring is fixed between the second sealing plug and the second water outlet pipe. Through the above structure, when the water temperature in the water cooling box is too high, the flow of water in the water cooling box can be accelerated, thereby quickly reducing the water temperature, thereby ensuring the cooling effect of the drill bit.

[0014] Preferably, a motor is fixed to the lower end surface of the water cooling box, and a mounting sleeve is fixed to the output end of the motor, and the mounting sleeve is connected to the rotating frame, and the rotating frame is connected to the fixed frame. Through the above structure, a basic force can be provided for the rotation of the rotating frame, thereby facilitating the rotation of the drill bit, ensuring sufficient contact between the drill bit and the cooling water, and further ensuring the cooling effect of the drill bit.

[0015] Preferably, the fixing frame includes a fixing ring, which is arranged in the water cooling box, and two adjacent fixing rings are fixed to each other by vertical rods, and a positioning rod is fixed to the lower end face of the lowermost fixing ring, and the positioning rod is nested with the opening on the annular frame to achieve positioning. The nested positioning effect between the positioning rod and the annular frame can ensure the stability of the installation of the fixing frame.

[0016] Preferably, a convex tooth block is fixed on the inner side of the fixing ring, and a handle is fixed on the uppermost fixing ring, which can facilitate the disassembly and assembly of the fixing frame.

[0017] Preferably, the rotating frame includes a fixing rod, on which a mounting plate is fixed, and the mounting plate and the fixing ring are distributed in a one-to-one correspondence, and a ball shaft is fixed at equal angles on the outside of the mounting plate, and the ball shaft is nested in a groove on the fixing ring for sliding. When the mounting plate rotates, the sliding action between the ball shaft and the fixing ring can ensure the stability of the rotation of the mounting plate.

[0018] Preferably, the bearing on the mounting plate is connected to a gear, and the gear is engaged with the convex tooth block to realize transmission, and a clamping block is fixed on the lower end face of the lowermost mounting plate, and the clamping block is nested with the mounting sleeve to realize positioning. Through the meshing transmission effect between the gear and the convex tooth block, a basic force can be provided for the self-rotation of the gear.

[0019] Preferably, a circular ring is fixed on the gear, and the center of the circular ring is not on the same vertical line as the center of the gear, and a positioning ring is provided on the inner side of the circular ring. At the same time, a third spring is fixed between the positioning ring and the circular ring. When the gear rotates, the circular ring can be driven to rotate eccentrically. With the action of the third spring, the positioning ring can produce eccentric vibration, thereby realizing the vibration of the drill bit and further eliminating the stress of the surface coating of the drill bit.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. This multi-layer coated PCB micro drill bit uses a modular elastic connection mechanism. This ensures flexible initial contact between the drill rod and the workpiece during use, preventing the drill rod from moving down too quickly and causing excessive force and breakage when in contact with the workpiece. This effectively extends the service life of the drill rod. It also allows for replacement of the drill rod if damaged, making the drill shank reusable and effectively reducing the cost of the drill bit.

[0022] 2. In the coating growth method for a multi-layer coating deposition PCB micro drill bit, after the coating production is completed, when the drill bit is water-cooled, the rotating water-cooling structure can make the drill bit fully contact with the cooling water, thereby achieving a one-time elimination of the coating stress. Combined with the eccentric vibration mechanism, the drill bit can generate eccentric vibration during the drill bit water cooling process, and the eccentric vibration of the drill bit can further achieve the elimination of the coating stress. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the exploded three-dimensional structure of the drill bit of the present invention;

[0024] Figure 2 This is a schematic diagram of a partial cross-sectional three-dimensional structure of the drill bit of the present invention;

[0025] Figure 3 This is a schematic diagram of the front three-dimensional structure of the water cooling box of the present invention;

[0026] Figure 4 This is a schematic side view of the three-dimensional structure of the water cooling box of the present invention;

[0027] Figure 5 This is a schematic diagram of the front cross-sectional three-dimensional structure of the water cooling box of the present invention;

[0028] Figure 6 This is a schematic diagram of the front cross-sectional three-dimensional structure of the water temperature regulating mechanism of the present invention;

[0029] Figure 7 This is a schematic structural diagram of the positioning ring and the fixing frame of the present invention in a disassembled state;

[0030] Figure 8 This is a schematic diagram of the front three-dimensional structure of the fixing frame of the present invention;

[0031] Figure 9 This is a schematic diagram of the front three-dimensional structure of the rotating frame of the present invention;

[0032] Figure 10 This is a schematic diagram of a partial cross-section of the three-dimensional structure of the rotating frame and the fixed frame of the present invention;

[0033] Figure 11 It is a schematic diagram of the three-dimensional structure of the circular ring cross section of the present invention.

[0034] In the figure: 1, drill handle; 2, threaded sleeve; 3, stopper; 4, first spring; 5, threaded joint; 6, stopper rod; 7, drill pipe; 8, water cooling box; 801, first water pump; 802, first water inlet pipe; 803, first water outlet pipe; 804, control valve; 805, temperature sensor; 806, ring frame; 9, water temperature regulating mechanism; 901, second water pump; 902, second water inlet pipe; 903, second water outlet pipe; 904, cross bar; 905, first sealing Plug; 906, second sealing plug; 907, second spring; 10, motor; 11, mounting sleeve; 12, fixing frame; 1201, fixing ring; 1202, vertical rod; 1203, positioning rod; 1204, protruding tooth block; 1205, handle; 13, rotating frame; 1301, fixing rod; 1302, mounting plate; 1303, ball shaft; 1304, gear; 1305, ring; 1306, positioning ring; 1307, third spring; 1308, blocking block. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] See also Figures 1-11 The present invention provides a technical solution: a PCB micro drill bit with multi-layer coating deposition, comprising a drill shank 1 and a drill rod 7, a threaded sleeve 2 being slidably connected inside the drill shank 1, a limit block 3 being fixed at equal angles on the outside of the threaded sleeve 2, the limit block 3 and the drill shank 1 being slidably connected, a first spring 4 being installed between the threaded sleeve 2 and the drill shank 1, the threaded sleeve 2 and the threaded joint 5 being threadedly connected, a limit rod 6 being fixed at the upper end of the threaded joint 5, the limit rod 6 being nested with the threaded sleeve 2 and the drill shank 1, and the central axis of the limit rod 6, the central axis of the threaded sleeve 2 and the central axis of the drill shank 1 being coincident, a drill rod 7 being fixed at the lower end of the threaded joint 5, and the surface of the drill rod 7 being provided with a coating.

[0037] When using the multi-layer coating deposition PCB micro drill bit, such as Figure 1-Figure 2 When the drill rod 7 is in the working state, the threaded joint 5 and the threaded sleeve 2 are moved upwards by the force of the drill rod 7. The sliding action between the limit block 3 and the slot on the drill rod 1 can ensure the stability of the movement of the threaded joint 5 and the threaded sleeve 2. At this time, the drill rod 7 and the workpiece are in flexible contact until the limit block 3 contacts the upper end of the slot on the drill rod 1 to achieve positioning. At this time, the drill rod 7 and the workpiece are in rigid contact, so as to achieve normal drilling. According to the above principle, the initial contact between the drill rod 7 and the workpiece can be made into flexible contact, which effectively avoids the problem of breakage caused by the drill rod 7 moving down too fast and contacting the workpiece, thereby effectively extending the service life of the drill rod 7. When the drill rod 7 is damaged, the drill rod 7 can be replaced by separating the threaded joint 5 from the threaded sleeve 2, so that the drill rod 1 and the threaded sleeve 2 can be reused, thereby reducing the cost of using the drill bit.

[0038] A coating growth method for a multi-layer coating deposition PCB micro drill bit comprises the following steps:

[0039] S1: Drill bit surface treatment stage: the drill bit is placed in an ultrasonic cleaning device to effectively treat debris and oil stains on the drill bit surface;

[0040] S2: Coating growth preparation stage: Install the drill bit in the magnetron sputtering chamber, install the target material, and use the vacuum pump to evacuate the magnetron sputtering chamber until the vacuum degree is ≤5×10 -4 Pa, and introduce 0.1-10Pa of argon into the magnetron sputtering chamber;

[0041] S3: Coating growth stage: The magnetron sputtering machine works to make the atoms on the target surface gain energy and sputter and adhere to the surface of the drill bit, thus forming a coating;

[0042] S4: Cooling stage: After the coating of the drill bit is completed, it needs to be cooled by a water cooling device to eliminate the coating stress and ensure the coating adhesion effect;

[0043] S5: Repeat the above steps S2, S3 and S4, and replace the target material in the S2 stage, so that a multi-layer coating structure can be formed on the surface of the drill bit.

[0044] The water cooling device includes a water cooling box 8, a first water pump 801 is installed at the front end of the right side of the water cooling box 8, and the first water pump 801 is connected to the first water inlet pipe 802, and the first water inlet pipe 802 is connected to the cooling water tank through a conduit, a first water outlet pipe 803 is installed at the front end of the left side of the first water inlet pipe 802, and a control valve 804 is installed on the first water outlet pipe 803, and the first water outlet pipe 803 is connected to the cooling water tank through a conduit, a temperature sensor 805 is installed on the inner wall of the water cooling box 8, and a temperature sensor 805 is fixed on the lower end of the inner side of the water cooling box 8. The annular frame 806; the motor 10 is fixed to the lower end surface of the water-cooling box 8, and the output end of the motor 10 is fixed with a mounting sleeve 11, and the mounting sleeve 11 is connected to the rotating frame 13, and the rotating frame 13 is connected to the fixed frame 12; the fixed frame 12 includes a fixing ring 1201, the fixing ring 1201 is arranged in the water-cooling box 8, and the two adjacent fixing rings 1201 are fixed to each other by a vertical rod 1202, and the lower end surface of the lowermost fixing ring 1201 is fixed with a positioning rod 1203, and the positioning rod 1203 is connected to the annular frame 80 6 is nested to achieve positioning; a convex tooth block 1204 is fixed on the inner side of the fixing ring 1201, and a handle 1205 is fixed on the uppermost fixing ring 1201; the rotating frame 13 includes a fixing rod 1301, a mounting plate 1302 is fixed on the fixing rod 1301, and the mounting plate 1302 and the fixing ring 1201 are distributed one-to-one, and a ball shaft 1303 is fixed at an equal angle on the outer side of the mounting plate 1302, and the ball shaft 1303 is nested in the groove on the fixing ring 1201 for sliding; the bearing connection on the mounting plate 1302 A gear 1304 is connected, and the gear 1304 meshes with the convex tooth block 1204 to achieve transmission, and a clamping block 1308 is fixed to the lower end surface of the lowermost mounting plate 1302, and the clamping block 1308 is nested with the mounting sleeve 11 to achieve positioning. A ring 1305 is fixed to the gear 1304, and the center of the ring 1305 is not on the same vertical line as the center of the gear 1304. A positioning ring 1306 is provided inside the ring 1305, and a third spring 1307 is fixed between the positioning ring 1306 and the ring 1305.

[0045] After the drill bit coating is completed, the drill bit is water-cooled to eliminate stress. Figure 3-Figure 11As shown, first, the drill bit is nested with the positioning ring 1306 to realize the installation of the drill bit. After the drill bit is installed, by starting the first water pump 801, the cooling water in the cooling water tank enters the water cooling box 8 through the first water inlet pipe 802. At this time, the control valve 804 is in a closed state, realizing the water storage function in the water cooling box 8. The temperature sensor 805 can be used to monitor the temperature of the cooling water in the water cooling box 8. After the water storage is completed, the control valve 804 is opened so that the cooling water in the water cooling box 8 can flow back into the cooling water tank. At this time, the cooling water inlet and outlet are in a balanced state, ensuring the liquid level of the cooling water in the water cooling box 8. The drill bit is then installed into the water cooling box 8 through the carrying handle 1205. The positioning of the rotating frame 13 can be achieved by nesting the clamping block 1308 with the installation sleeve 11. The installation and positioning of the fixed frame 12 can be achieved by nesting the positioning rod 1203 with the opening on the annular frame 806, thereby completing the installation. The motor 10 is then started to drive the installation sleeve 11 to rotate. The fixing rod 1301, the mounting plate 1302, the gear 1304, the ring 1305, the positioning ring 1306 and the drill bit are driven to revolve. The rotation can make the drill bit fully contact with the cooling water, which can not only quickly cool the drill bit, but also achieve a primary stress elimination effect on the drill bit coating. When the gear 1304, the ring 1305, the positioning ring 1306 and the drill bit revolve, the meshing transmission effect between the gear 1304 and the convex tooth block 1204 causes the ring 1305, the positioning ring 1306 and the drill bit to rotate synchronously. Since the center of the ring 1305 is not in the same vertical line as the center of the gear 1304, the ring 1305, the positioning ring 1306 and the drill bit rotate eccentrically, and the elastic effect of the third spring 1307 can make the positioning ring 1306 and the drill bit generate eccentric vibration. Through the vibration of the drill bit, the stress of the drill bit coating can be secondary eliminated, thereby ensuring the production quality of the drill bit coating.

[0046] A water temperature regulating mechanism 9 is installed in the water cooling box 8, and the water temperature regulating mechanism 9 includes a second water pump 901 and a second water outlet pipe 903, and the second water pump 901 is fixed on the water cooling box 8, and the second water pump 901 is connected to the second water inlet pipe 902 fixed on the water cooling box 8, and the second water pump 901 is connected to the cooling water tank through a conduit, the second water outlet pipe 903 is fixed on the water cooling box 8, and the second water outlet pipe 903 is connected to the cooling water tank through a conduit, and a cross bar 904 is provided in the second water outlet pipe 903, and the cross bar 904 and the second water inlet pipe 902 are slidably connected, one end of the cross bar 904 is fixed with a first sealing plug 905 slidably connected to the second water inlet pipe 902, and one end of the cross bar 904 is fixed with a second sealing plug 906 slidably connected to the second water outlet pipe 903, and a second spring 907 is fixed between the second sealing plug 906 and the second water outlet pipe 903;

[0047] During the water cooling process of the drill bit, Figure 3-Figure 11As shown, when the temperature sensor 805 detects that the water temperature in the water cooling box 8 is too high, the second water pump 901 is started to send the cooling water in the cooling water tank into the second water inlet pipe 902. Under the action of water pressure, the first sealing plug 905 moves in the second water inlet pipe 902. At this time, the cross bar 904 and the second sealing plug 906 are forced to move synchronously. When the first sealing plug 905 releases the seal on the second water inlet pipe 902, the second sealing plug 906 just releases the seal on the second water outlet pipe 903, thereby forming a second cooling water circulation channel. At this time, the cooling water inlet amount and the cooling water outlet amount in the water cooling box 8 increase synchronously, thereby effectively accelerating the replacement of the heated cooling water in the water cooling box 8, so that the cooling water temperature in the water cooling box 8 can be quickly reduced, thereby effectively ensuring the cooling effect of the drill bit.

[0048] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements that are inherent to such process, method, article or apparatus.

[0049] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method of the present invention and its core ideas. The above is only a preferred implementation method of the present invention. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principles of the present invention, they can make several improvements, modifications or changes, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the scope of protection of the present invention.

Claims

1. A coating growth method for a multi-layer coating deposition PCB micro drill bit, characterized in that: The following steps are involved: S1: Drill bit surface treatment stage: the drill bit is placed in an ultrasonic cleaning device to effectively treat debris and oil stains on the drill bit surface; S2: Coating growth preparation stage: Install the drill bit in the magnetron sputtering chamber, install the target material, and use the vacuum pump to evacuate the magnetron sputtering chamber until the vacuum degree is ≤5×10 -4 Pa, and introduce 0.1-10Pa of argon into the magnetron sputtering chamber; S3: Coating growth stage: The magnetron sputtering machine works to make the atoms on the target surface gain energy and sputter and adhere to the surface of the drill bit, thus forming a coating; S4: Cooling stage: After the coating of the drill bit is completed, it needs to be cooled by a water cooling device to eliminate the coating stress and ensure the coating adhesion effect; S5: Repeat the above steps S2, S3 and S4, and replace the target material in the S2 stage, so that a multi-layer coating structure can be formed on the surface of the drill bit; The water cooling device comprises a water cooling box (8), a first water pump (801) is installed at the front end of the right side of the water cooling box (8), and the first water pump (801) is connected to the first water inlet pipe (802), and the first water inlet pipe (802) is connected to the cooling water tank through a conduit, a first water outlet pipe (803) is installed at the front end of the left side of the first water inlet pipe (802), and a control valve (804) is installed on the first water outlet pipe (803), and the first water outlet pipe (803) is connected to the cooling water tank through a conduit, a temperature sensor (805) is installed on the inner wall of the water cooling box (8), and a ring frame (806) is fixed to the lower end of the inner side of the water cooling box (8); A water temperature regulating mechanism (9) is installed in the water cooling box (8), and the water temperature regulating mechanism (9) includes a second water pump (901) and a second water outlet pipe (903), and the second water pump (901) is fixed on the water cooling box (8), and the second water pump (901) is connected to the second water inlet pipe (902) fixed on the water cooling box (8), and the second water pump (901) is connected to the cooling water tank through a conduit, and the second water outlet pipe (903) is fixed on the water cooling box (8), and the second water outlet pipe (903) is connected to the cooling water tank through a conduit. The water tanks are connected to each other, and a cross bar (904) is provided in the second water outlet pipe (903), and the cross bar (904) and the second water inlet pipe (902) are slidably connected. One end of the cross bar (904) is fixed with a first sealing plug (905) slidably connected in the second water inlet pipe (902), and one end of the cross bar (904) is fixed with a second sealing plug (906) slidably connected in the second water outlet pipe (903), and a second spring (907) is fixed between the second sealing plug (906) and the second water outlet pipe (903).

2. The coating growth method for a multi-layer coating deposition PCB micro drill bit according to claim 1, characterized in that: A motor (10) is fixed to the lower end surface of the water cooling box (8), and a mounting sleeve (11) is fixed to the output end of the motor (10), and the mounting sleeve (11) is connected to the rotating frame (13), and the rotating frame (13) is connected to the fixed frame (12).

3. The coating growth method for a multi-layer coating deposition PCB micro drill bit according to claim 2, characterized in that: The fixing frame (12) includes a fixing ring (1201), which is arranged in the water cooling box (8), and two adjacent fixing rings (1201) are fixed to each other through a vertical rod (1202), and a positioning rod (1203) is fixed to the lower end surface of the lowermost fixing ring (1201), and the positioning rod (1203) is nested with the opening on the annular frame (806) to achieve positioning.

4. The coating growth method for a multi-layer coating deposition PCB micro drill according to claim 3, characterized in that: A protruding tooth block (1204) is fixed on the inner side of the fixing ring (1201), and a handle (1205) is fixed on the uppermost fixing ring (1201).

5. The coating growth method for a multi-layer coating deposition PCB micro drill bit according to claim 4, characterized in that: The rotating frame (13) includes a fixing rod (1301), a mounting plate (1302) is fixed on the fixing rod (1301), and the mounting plate (1302) and the fixing ring (1201) are distributed in a one-to-one correspondence, and a ball shaft (1303) is fixed at an equal angle on the outside of the mounting plate (1302), and the ball shaft (1303) is nested in a groove on the fixing ring (1201) for sliding.

6. The coating growth method for a multi-layer coating deposition PCB micro drill bit according to claim 5, characterized in that: The bearing on the mounting plate (1302) is connected to a gear (1304), and the gear (1304) is engaged with the convex tooth block (1204) to realize transmission, and a clamping block (1308) is fixed on the lower end surface of the lowermost mounting plate (1302), and the clamping block (1308) and the mounting sleeve (11) are nested to realize positioning.

7. The coating growth method for a multi-layer coating deposition PCB micro drill according to claim 6, characterized in that: A circular ring (1305) is fixed on the gear (1304), and the center of the circular ring (1305) is not on the same vertical line as the center of the gear (1304), and a positioning ring (1306) is provided inside the circular ring (1305), and a third spring (1307) is fixed between the positioning ring (1306) and the circular ring (1305).

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