A plating hanger for vacuum nano-plating of PCB drill bits

Abstract

The utility model relates to PCB drill production device technical field discloses a kind of coating hangers for PCB drill vacuum nanometer coating, including base, the upper surface of the base is fixedly connected with fixed column, the inside of the fixed column is hollow, the outer surface of the fixed column is equipped with slot, the bottom surface of the slot is equipped with T type limiting slot, T type limiting block is inserted in the inside of the T type limiting slot, the outside of the T type limiting block is equipped with limiting assembly, the inside bottom surface of the fixed column is fixedly connected with hydraulic cylinder, the top of the hydraulic cylinder is fixedly connected with lifting column. In the utility model, the cooperation of the hydraulic cylinder, lifting column, through slot, moving plate and supporting protrusion set, the position of limiting assembly relative to drill needle continues to change, reduces fixed blocking area, improves coating uniformity, at the same time, hydraulic lifting can adjust drill needle insertion depth, shorten stroke when installing, expand limiting range when coating.

Description

Technical Field

[0001] This utility model relates to the technical field of PCB drill bit production equipment, and in particular to a coating fixture for vacuum nano-coating of PCB drill bits. Background Technology

[0002] PCB drill bits are miniature carbide (tungsten carbide) drill bits specifically designed for drilling holes in printed circuit boards (PCBs). To improve the strength of the top drill bit and prevent passivation or wear after repeated drilling, which would affect the quality of multilayer PCB circuit boards, PCB drill bits need to undergo surface vacuum nano-coating. When performing vacuum nano-coating on PCB drill bits, the use of the fixture is crucial to ensuring coating quality, improving production efficiency, and guaranteeing process stability, directly affecting coating uniformity, efficiency, yield, and cost.

[0003] A search revealed Chinese Patent Publication No. CN220132331U, which discloses a rotary fixture for vacuum nano-coating of PCB drill bits. The fixture comprises a rotating component and a fixture assembly installed inside a processing box, which work together to rotate the fixture, thereby rotating the PCB drill bits on the fixture. This allows workers to observe the coating process on the PCB drill bits from all angles, effectively preventing incomplete coating on the back of the PCB drill bits that workers cannot observe, thus ensuring the efficiency of the PCB drill bit coating process.

[0004] In actual use, the aforementioned drill bit holder has a problem: to improve the suspension stability of the drill bit, the inner wall of the mounting hole used to limit the drill bit will fit against the outer wall of the drill bit. At this time, the mounting hole will block a local area of ​​the drill bit, resulting in uneven coating and affecting the coating effect. To solve this problem, a coating holder for vacuum nano-coating of PCB drill bits is proposed. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a coating fixture for vacuum nano-coating of PCB drill bits, which aims to solve the problem that the coating thickness is uneven due to obstruction caused by traditional fixed fixtures in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a coating fixture for vacuum nano-coating of PCB drill bits, comprising a base, a fixing column fixedly connected to the upper surface of the base, the fixing column being hollow inside, a slot being formed on the outer surface of the fixing column, a T-shaped limiting groove being formed on the bottom surface of the slot, a T-shaped limiting block being inserted into the T-shaped limiting groove, a limiting component being provided on the outer side of the T-shaped limiting block, a hydraulic cylinder being fixedly connected to the inner bottom surface of the fixing column, a lifting column being fixedly connected to the top of the hydraulic cylinder, a through groove being formed on the outer surface of the fixing column, a movable plate being provided inside the through groove, and a supporting protrusion being fixedly connected to the upper surface of the movable plate;

[0007] The limiting component includes an upper limit ring, and the number of upper limit rings is several. The several upper limit rings are arranged in a horizontal linear array at intervals, and adjacent upper limit rings are fixedly connected by connecting rods.

[0008] As a further description of the above technical solution:

[0009] The movable plate is located directly below the limiting component, and the number and position of the supporting protrusions are adapted to the upper limiting ring.

[0010] As a further description of the above technical solution:

[0011] The end of the movable plate closest to the fixed column is fixedly connected to the lifting column.

[0012] As a further description of the above technical solution:

[0013] The thickness of the slot is greater than that of the T-shaped limiting block.

[0014] As a further description of the above technical solution:

[0015] A protective cylinder is inserted inside the fixed column, and the movable plate is fixedly connected to the protective cylinder.

[0016] As a further description of the above technical solution:

[0017] The end of the T-shaped limiting block away from the fixed post passes through the T-shaped limiting groove, and the limiting component is fixedly connected to the end of the T-shaped limiting block away from the fixed post.

[0018] As a further description of the above technical solution:

[0019] The bottom of the upper limit ring is fixedly connected to the lower limit ring by an arc-shaped rod.

[0020] As a further description of the above technical solution:

[0021] The arc-shaped rod is arranged to expand outwards towards the side away from the upper limit ring, and the diameter of the lower limit ring is the same as the diameter of the upper limit ring.

[0022] This utility model has the following beneficial effects:

[0023] 1. In this utility model, the position of the limiting component relative to the drill bit is continuously changed through the cooperation of the hydraulic cylinder, lifting column, through groove, moving plate and supporting protrusion, reducing the fixed obstruction area and improving the uniformity of coating. At the same time, the hydraulic lifting can adjust the insertion depth of the drill bit, shorten the stroke during installation and expand the limiting range during coating. Through the cooperation of the slot, T-shaped limiting groove and T-shaped limiting block, the limiting component can be quickly disassembled and installed to adapt to the coating requirements of drill bits of different specifications.

[0024] 2. In this utility model, the protective sleeve can reduce the amount of coating material entering the fixed column, thereby reducing the impact on the hydraulic cylinder and extending the life of key components. The arc-shaped rod and the lower limit ring can be connected to form a double-point support. Combined with the hemispherical support protrusion point contact design, it can ensure the positioning stability of the drill bit and minimize the contact area. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall coating fixture for vacuum nano-coating of PCB drill bits proposed in this utility model;

[0026] Figure 2 This is a schematic diagram of the fixing post of a coating hanger for vacuum nano-coating of PCB drill bits proposed in this utility model;

[0027] Figure 3 This is a schematic cross-sectional view of the front part of the fixing column of a coating hanger for vacuum nano-coating of PCB drill bits according to the present invention.

[0028] Figure 4 This utility model proposes a coating fixture for vacuum nano-coating of PCB drill bits. Figure 2 A partial diagram of point A;

[0029] Figure 5 This is a schematic diagram of the T-shaped limiting block and limiting components of a coating fixture for vacuum nano-coating of PCB drill bits proposed in this utility model.

[0030] Figure 6 This is a schematic diagram of the protective cylinder of a coating hanger for vacuum nano-coating of PCB drill bits proposed in this utility model.

[0031] Legend:

[0032] 1. Base; 2. Fixing column; 3. Slot; 4. T-shaped limiting groove; 5. T-shaped limiting block; 6. Limiting component; 61. Upper limiting ring; 62. Connecting rod; 7. Hydraulic cylinder; 8. Lifting column; 9. Through groove; 10. Moving plate; 11. Support protrusion; 12. Protective cylinder; 13. Arc rod; 14. Lower limiting ring. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] Reference Figures 1-3 This utility model provides an embodiment of a coating fixture for vacuum nano-coating of PCB drill bits, comprising a base 1, a fixing post 2 fixedly connected to the upper surface of the base 1, the fixing post 2 being hollow inside, a slot 3 formed on the outer surface of the fixing post 2, a T-shaped limiting groove 4 formed on the bottom surface of the slot 3, a T-shaped limiting block 5 inserted into the T-shaped limiting groove 4, the thickness of the slot 3 being greater than that of the T-shaped limiting block 5, the width of the slot 3 being D1, and the neck width of the T-shaped limiting block 5 being D2, satisfying a clearance fit of D1-D2=0.05-0.1mm; the depth H1 of the T-shaped limiting groove 4 and the flange thickness H2 of the T-shaped limiting block 5 satisfying H1-H2=0.3-0.5mm, the T-shaped limiting block 5 directly After being inserted into slot 3, it can be moved down to be inserted into T-shaped limiting block 5 for limiting. N35 grade neodymium iron boron magnet is embedded on the bottom surface of T-shaped limiting block 5. The size is 10×5×3mm and the surface magnetic flux density is ≥1200Gs. The bottom surface of T-shaped limiting groove 4 is made of DT4C electrical pure iron with a thickness of 2mm and is phosphated. When T-shaped limiting block 5 is inserted into T-shaped limiting groove 4, magnetic attraction limiting can be formed between T-shaped limiting block 5 and the bottom surface of T-shaped limiting groove 4. At the same time, the inner wall of T-shaped limiting groove 4 will limit T-shaped limiting block 5, so that T-shaped limiting block 5 cannot shake or shift. The end of T-shaped limiting block 5 away from fixed post 2 passes through T-shaped limiting groove 4. Limiting component 6 is provided on the outer side of T-shaped limiting block 5.

[0035] When it is necessary to replace the limiting component 6 with one that matches the drill bit specifications, simply pull up the T-shaped limiting block 5 so that it leaves the T-shaped limiting groove 4. Then, pull the T-shaped limiting block 5 out of the T-shaped limiting groove 4 to complete the disassembly. The structure is simple and the operation is convenient.

[0036] Reference Figures 4-6The limiting component 6 includes an upper limit ring 61, and there are several upper limit rings 61. The diameter of the upper limit ring 61 is compatible with the diameter of the drill bit to be processed. Several upper limit rings 61 are arranged in a horizontal linear array at intervals. Adjacent upper limit rings 61 are fixedly connected by connecting rods 62. In this embodiment, there are two connecting rods 62 fixedly connected between adjacent upper limit rings 61 to ensure connection stability. In actual use, the number and material of connecting rods 62 and upper limit rings 61 can be selected according to specific stability requirements. The limiting component 6 is fixedly connected to the end of the T-shaped limiting block 5 away from the fixed post 2. When the T-shaped limiting block 5 moves, it can drive the limiting component 6 to move synchronously.

[0037] A hydraulic cylinder 7 is fixedly connected to the inner bottom surface of the fixed column 2, and a lifting column 8 is fixedly connected to the top of the hydraulic cylinder 7. The hydraulic cylinder 7 is equipped with a 0.1mm resolution grating ruler and achieves a lifting speed of 10-30mm / s through PLC control. The stroke range can be preset to 20-100mm. At the same time, a low-heat servo hydraulic cylinder is selected, with an operating temperature range of -20℃ to 80℃. It has a built-in PT100 temperature sensor, which triggers frequency reduction protection when the cylinder temperature is >60℃. Under normal circumstances, the hydraulic cylinder 7 drives the lifting column 8 to move up and down during a single coating process. After about 3-4 rotations, the heat generated by the hydraulic cylinder 7 is relatively low and can be passively cooled. In practical applications, heat dissipation components can be added according to the specific heat dissipation requirements (such as leaving a 5-8mm annular gap between the inner wall of the fixed column 2 and the cylinder body of the hydraulic cylinder 7, filling the gap with a graphite thermal pad with a high thermal conductivity, and ensuring the graphite pad is tightly fitted to the cylinder body and the inner wall of the fixed column 2 to conduct heat to the outside for indirect heat dissipation). When the hydraulic cylinder 7 is running, it can drive the lifting column 8 to move linearly up and down. The outer surface of the fixed column 2 is provided with a through groove 9, and the inner surface of the through groove 9... The unit is equipped with a movable plate 10, which can move up and down inside the through groove 9, thereby preventing the fixed column 2 from obstructing the movement of the movable plate 10. The end of the movable plate 10 near the fixed column 2 is fixedly connected to the lifting column 8. When the lifting column 8 moves up and down, it will drive the movable plate 10 to move synchronously. A support protrusion 11 is fixedly connected to the upper surface of the movable plate 10. The support protrusion 11 is made of silicon nitride ceramic, which has good wear resistance and anti-adhesion properties in a vacuum and high temperature environment. The movable plate 10 is located directly below the limiting component 6. The number and position of the 1 are adapted to the upper limit ring 61. The support protrusion 11 can support and limit the bottom of the drill bit inserted into the upper limit ring 61. At the same time, the support protrusion 11 is hemispherical and its top is only in point contact with the bottom of the drill bit, which can reduce the obstruction to the surface of the drill bit during coating. Meanwhile, the lifting column 8 drives the moving plate 10 to move up and down, which can adjust the support position of the bottom of the drill bit. At the same time, when the lifting column 8 drives the moving plate 10 to move up and down, the drill bit inserted into the upper limit ring 61 can move up and down.

[0038] When inserting the drill bit into the upper limit ring 61, the operator can activate the hydraulic cylinder 7 to move the lifting column 8 upward, so that the moving plate 10 and the support protrusion 11 are close to the upper limit ring 61, reducing the required insertion depth of the drill bit and thus improving installation efficiency. After completing the installation of the drill bit for the single row of limiting components 6, the operator can activate the hydraulic cylinder 7 to move the moving plate 10 downward, thereby moving the drill bit downward, so that the upper limit ring 61 moves upward relative to the drill bit, improving the limiting stability of the drill bit. During the coating process, the operator can activate the hydraulic cylinder 7 to move the moving plate 10 in a slow up-and-down reciprocating motion, so that the position of the upper limit ring 61 relative to the drill bit changes continuously, thereby avoiding the upper limit ring 61 being fixed in position and causing obstruction of the outer wall of the drill bit, which would affect the coating effect.

[0039] Reference Figures 5-6 A protective cylinder 12 is inserted inside the fixed column 2. The movable plate 10 is fixedly connected to the protective cylinder 12. The movable plate 10 can shield and protect the through groove 9, preventing a large amount of coating material from entering the fixed column 2 during the coating process and affecting the use of the hydraulic cylinder 7. The bottom of the upper limit ring 61 is fixedly connected to the lower limit ring 14 through the arc-shaped rod 13. Both the upper limit ring 61 and the lower limit ring 14 are made of 316L stainless steel with low outgassing characteristics to meet the cleanliness requirements of vacuum coating. At the same time, the connection node P between the arc-shaped rod 13 and the lower limit ring 14 is laser spot welded with a weld diameter of Φ0.5. mm, with a spacing of 2mm, the arc-shaped rod 13 is set to expand outwards towards the side away from the upper limit ring 61, the diameter of the lower limit ring 14 is the same as the diameter of the upper limit ring 61, the lower limit ring 14 can cooperate with the upper limit ring 61 to provide multi-point support for the outside of the drill bit, and improve the limiting stability of the drill bit. The cross-section of the lower limit ring 14 and the upper limit ring 61 is set in a circular shape, which can reduce the contact area with the outer wall of the drill bit, and thus reduce the obstruction of the outer wall of the drill bit during coating. At the same time, the outward expansion arc design of the arc-shaped rod 13 can make the arc-shaped rod 13 as far away from the drill bit as possible, thereby reducing the obstruction of the outer wall of the drill bit.

[0040] Working principle: According to the diameter of the drill bit to be coated, select the appropriate limiting component 6, insert the T-shaped limiting block 5 into the slot 3 of the fixing column 2, and press it down to embed it into the T-shaped limiting groove 4. Fix it by magnetic attraction. The limiting component 6 is installed in place with the T-shaped limiting block 5, and the initial configuration of the hanger is completed. Start the hydraulic cylinder 7 to drive the lifting column 8 to rise, which will drive the moving plate 10 and the support protrusion 11 to move upward, reduce the insertion depth of the drill bit, and facilitate quick clamping.

[0041] PCB drill bits are inserted sequentially into the upper limit ring 61, whose bottom is supported by a hemispherical support protrusion 11, forming point contact support. After the single row of drill bits is installed, the hydraulic cylinder 7 drives the moving plate 10 to descend, causing the drill bits to move downward. The upper limit ring 61 and the lower limit ring 14 together clamp the drill bits, enhancing stability. The fixture, along with the drill bits, is sent into the vacuum coating chamber to begin nano-coating. The hydraulic cylinder 7 drives the lifting column 8 to slowly reciprocate, causing the drill bits to move up and down during the coating process. The contact position between the upper limit ring 61 and the drill bits changes dynamically, avoiding uneven coating caused by fixed obstruction. The outward expansion design of the arc rod 13 reduces obstruction to the side wall of the drill bits, ensuring uniform coverage of the coating layer. After the coating is completed, the hydraulic cylinder 7 drives the moving plate 10 to move upward, causing the top of the drill bits to detach from the upper limit ring 61 for easy removal. When replacing the next batch of drill bits, the T-shaped limit block 5 can be pulled upward directly, and the matching limit component 6 can be replaced, repeating the above process.

[0042] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A coating fixture for vacuum nano-coating of PCB drill bits, comprising a base (1), characterized in that: A fixed column (2) is fixedly connected to the upper surface of the base (1). The interior of the fixed column (2) is hollow. A slot (3) is provided on the outer surface of the fixed column (2). A T-shaped limiting groove (4) is provided on the bottom surface of the slot (3). A T-shaped limiting block (5) is inserted into the interior of the T-shaped limiting groove (4). A limiting component (6) is provided on the outer side of the T-shaped limiting block (5). A hydraulic cylinder (7) is fixedly connected to the bottom surface of the fixed column (2). A lifting column (8) is fixedly connected to the top of the hydraulic cylinder (7). A through groove (9) is provided on the outer surface of the fixed column (2). A moving plate (10) is provided inside the through groove (9). A supporting protrusion (11) is fixedly connected to the upper surface of the moving plate (10). The limiting component (6) includes an upper limit ring (61), and the number of upper limit rings (61) is several. The several upper limit rings (61) are arranged in a horizontal linear array at intervals, and adjacent upper limit rings (61) are fixedly connected by connecting rods (62).

2. The coating fixture for vacuum nano-coating of PCB drill bits according to claim 1, characterized in that: The movable plate (10) is located directly below the limiting component (6), and the number and position of the supporting protrusions (11) are adapted to the upper limiting ring (61).

3. The coating fixture for vacuum nano-coating of PCB drill bits according to claim 1, characterized in that: The movable plate (10) is fixedly connected to the lifting column (8) at one end near the fixed column (2).

4. The coating fixture for vacuum nano-coating of PCB drill bits according to claim 1, characterized in that: The thickness of the slot (3) is greater than that of the T-shaped limiting block (5).

5. A coating fixture for vacuum nano-coating of PCB drill bits according to claim 1, characterized in that: A protective cylinder (12) is inserted inside the fixed column (2), and the movable plate (10) is fixedly connected to the protective cylinder (12).

6. The coating fixture for vacuum nano-coating of PCB drill bits according to claim 1, characterized in that: The end of the T-shaped limiting block (5) away from the fixed post (2) passes through the T-shaped limiting groove (4), and the limiting component (6) is fixedly connected to the end of the T-shaped limiting block (5) away from the fixed post (2).

7. A coating fixture for vacuum nano-coating of PCB drill bits according to claim 1, characterized in that: The bottom of the upper limit ring (61) is fixedly connected to the lower limit ring (14) by an arc rod (13).

8. A coating fixture for vacuum nano-coating of PCB drill bits according to claim 7, characterized in that: The arc-shaped rod (13) is arranged to extend outward toward the side away from the upper limit ring (61), and the diameter of the lower limit ring (14) is the same as the diameter of the upper limit ring (61).

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