PCB (printed circuit board) drill point with wear-resistant coating

Abstract

The utility model discloses a pcb drill point with a wear-resistant coating, and relates to the technical field of pcb drill points, the pcb drill point with the wear-resistant coating comprises a drill handle, a drill bit and a wear-resistant assembly, the drill bit is arranged on the drill handle, a plurality of chip grooves are formed in the drill bit, the chip grooves are used for discharging waste chips, and the wear-resistant assembly is arranged on the drill handle. The wear-resistant assembly is arranged on the chip groove and comprises a wear-resistant layer, a high-temperature-resistant layer and a corrosion-resistant layer, the wear-resistant layer is used for enhancing the hardness of the chip groove, the high-temperature-resistant layer is used for increasing the melting point of the chip groove, and the corrosion-resistant layer is used for enhancing the chemical stability of the chip groove; and the wear-resistant layer, the high-temperature-resistant layer and the corrosion-resistant layer are sequentially stacked. Abrasion of the drill bit in the high-speed rotating process is reduced through the abrasion-resistant assembly, erosion damage of cutting fluid and the high-temperature environment to the drill bit is prevented, and therefore the drill bit is prevented from being broken, and the service life of the drill bit is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of PCB drill needles, in particular to a PCB drill needle with a wear-resistant coating. Background Art

[0002] At present, PCB drill bits are mainly used in PCB manufacturing: PCB Chinese name is printed circuit board, also known as printed circuit board, printed circuit board, is an important electronic component, the support body of electronic components, and the provider of electrical connections for electronic components. Because it is made using electronic printing technology, it is called a "printed" circuit board.

[0003] The PCB drill bit consists of two parts: the drill shank and the drill bit. The drill shank is used to be installed on the corresponding equipment, so that the equipment drives the drill bit to rotate. The drill bit opens holes in the printed circuit board during the rotation process. In order to complete the hole opening work efficiently, the PCB drill bit needs to rotate continuously at a high speed. However, the PCB drill bit does not have a corresponding protective coating, which causes the PCB drill bit to wear out and break quickly. Utility Model Content

[0004] The main purpose of the utility model is to provide a PCB drill needle with a wear-resistant coating, aiming to enhance the wear resistance of the PCB drill needle to prevent the PCB drill needle from breaking.

[0005] To achieve the above-mentioned purpose, the present invention provides a PCB drill needle with a wear-resistant coating, comprising:

[0006] Drill shank;

[0007] A drill bit is provided on the drill shank, and the drill bit is provided with a plurality of chip removal grooves for removing waste chips; and

[0008] A wear-resistant component is arranged on the chip groove, and the wear-resistant component includes a wear-resistant layer, a high-temperature resistant layer and a corrosion-resistant layer. The wear-resistant layer is used to enhance the hardness of the chip groove, the high-temperature resistant layer is used to increase the melting point of the chip groove, and the corrosion-resistant layer is used to enhance the chemical stability of the chip groove, and the wear-resistant layer, the high-temperature resistant layer and the corrosion-resistant layer are stacked in sequence.

[0009] Preferably, the wear-resistant layer is an aluminum oxide layer, the high-temperature resistant layer is a silicon nitride layer, and the corrosion-resistant layer is a chromium silicon carbon layer.

[0010] Preferably, the thickness of the wear-resistant layer is greater than 0.5 micrometers and less than 5 micrometers.

[0011] Preferably, the thickness of the high temperature resistant layer is greater than one micron and less than ten microns.

[0012] Preferably, the thickness of the corrosion-resistant layer is greater than 0.1 micrometer and less than 1 micrometer.

[0013] Preferably, the plurality of chip removal grooves are symmetrical about the central axis of the drill bit, and the chip removal grooves extend in a spiral shape along the axial direction of the drill bit.

[0014] Preferably, a reinforcing component is provided on the wear-resistant component, and the reinforcing component includes a reinforcing layer, a strengthening layer and a reinforcement layer.

[0015] Preferably, the strengthening layer is a cubic boron nitride layer, the strengthening layer is a polycrystalline diamond layer, and the enhancement layer is a metal-ceramic composite layer.

[0016] Preferably, the thickness of the reinforcing component is greater than ten microns and less than thirty microns.

[0017] Preferably, the thickness of the reinforcing layer is greater than one micron and less than ten microns, the thickness of the strengthening layer is greater than two microns and less than seven microns, and the thickness of the enhancing layer is greater than one micron and less than twelve microns.

[0018] In the technical solution provided by the present invention, a plurality of chip grooves are provided on the drill bit, and the chip grooves are used to discharge waste chips. The wear-resistant component is arranged on the chip groove, and the wear-resistant component includes a wear-resistant layer, a high-temperature resistant layer and a corrosion-resistant layer. The wear-resistant layer is used to enhance the hardness of the chip groove, the high-temperature resistant layer is used to increase the melting point of the chip groove, and the corrosion-resistant layer is used to enhance the chemical stability of the chip groove. The wear-resistant layer, the high-temperature resistant layer and the corrosion-resistant layer are stacked in sequence. The wear-resistant component reduces the wear of the drill bit during high-speed rotation, prevents the cutting fluid and the high-temperature environment from corroding and damaging the drill bit, thereby preventing the drill bit from breaking and improving the service life of the drill bit. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0020] Figure 1 A three-dimensional schematic diagram of an embodiment of a PCB drill needle with a wear-resistant coating provided by the utility model;

[0021] Figure 2 for Figure 1 Schematic diagram of the structure of the medium wear-resistant component;

[0022] Figure 3 for Figure 1 Schematic diagram of the structure of the reinforcement component.

[0023] Description of Figure Numbers:

[0024] 1. Drill shank; 2. Drill bit; 21. Chip groove; 3. Wear-resistant component; 31. Wear-resistant layer; 32. High-temperature resistant layer; 33. Corrosion-resistant layer; 4. Reinforcement component; 41. Reinforcement layer; 42. Strengthening layer; 43. Enhanced layer.

[0025] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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.

[0027] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0028] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features specified as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0029] The utility model provides a PCB drill needle with a wear-resistant coating. Figures 1 to 3 The utility model provides an embodiment of a PCB drill needle with a wear-resistant coating.

[0030] Please also refer to Figures 1 to 2The PCB drill needle with a wear-resistant coating includes a drill shank 1, a drill bit 2 and a wear-resistant component 34, wherein the drill bit 2 is arranged on the drill shank 1, and a plurality of chip grooves 21 are opened on the drill bit 2, the chip grooves 21 are used to discharge waste chips, and the wear-resistant component 34 is arranged on the chip groove 21. The wear-resistant component 34 includes a wear-resistant layer 31, a high-temperature resistant layer 32 and a corrosion-resistant layer 33. The wear-resistant layer 31 is used to enhance the hardness of the chip groove 21, the high-temperature resistant layer 32 is used to increase the melting point of the chip groove 21, and the corrosion-resistant layer 33 is used to enhance the chemical stability of the chip groove 21, and the wear-resistant layer 31, the high-temperature resistant layer 32 and the corrosion-resistant layer 33 are stacked in sequence.

[0031] The drill bit 2 has a cutting edge for cutting and a chip groove 21 for discharging waste chips. The number of the chip grooves 21 is the same as the number of the cutting edges, and the cutting edge is located between two adjacent chip grooves 21. The wear-resistant component 34 covers the chip groove 21 and also covers the cutting edge, so that the cutting edge is also protected by the wear-resistant component 34, thereby reducing the wear efficiency of the cutting edge, extending the service life of the cutting edge, and thus extending the service life of the drill bit 2.

[0032] The wear-resistant layer 31, the high-temperature resistant layer 32 and the corrosion-resistant layer 33 on the wear-resistant component 34 are stacked in sequence according to their functions and blocking targets. The corrosion-resistant layer 33 is mainly used to block the cutting fluid sprayed on the drill bit 2 when the drill bit 2 opens a hole, so as to prevent the cutting fluid from corroding the blade of the drill bit 2 and the chip groove 21. The blade will become blunt after being corroded, making it difficult to open a hole during high-speed rotation. The chip groove 21 will become rough after being corroded, making it difficult for waste chips to pass through the chip groove 21 and be discharged out of the hole opened by the drill bit 2. Therefore, the corrosion-resistant layer 33 is arranged on the outermost side. The high-temperature resistant layer 32 is used to increase the melting point of the drill bit 2, so that the blade and the chip groove 21 of the drill bit 2 will not be affected by the high temperature in a high-temperature environment, thereby avoiding the softening and accelerated wear of the drill bit 2 at high temperature. Therefore, the high-temperature resistant layer 32 is arranged inside the corrosion-resistant layer 33, and the wear-resistant layer 31 is used to increase the hardness of the drill bit 2, so that the wear efficiency of the drill bit 2 during high-speed cutting is reduced, thereby extending the time that the drill bit 2 can be used to open holes, thereby increasing the service life of the drill bit 2, so the wear-resistant layer 31 is arranged inside the high-temperature resistant layer 32 and in direct contact with the base of the drill bit 2.

[0033] Therefore, in the technical solution provided by the present invention, a plurality of chip grooves 21 are provided on the drill bit 2, and the chip grooves 21 are used to discharge waste chips. The wear-resistant component 34 is arranged on the chip groove 21, and the wear-resistant component 34 includes a wear-resistant layer 31, a high-temperature resistant layer 32 and a corrosion-resistant layer 33. The wear-resistant layer 31 is used to enhance the hardness of the chip groove 21, the high-temperature resistant layer 32 is used to increase the melting point of the chip groove 21, and the corrosion-resistant layer 33 is used to enhance the chemical stability of the chip groove 21, and the wear-resistant layer 31, the high-temperature resistant layer 32 and the corrosion-resistant layer 33 are stacked in sequence. The wear-resistant component 34 reduces the wear of the drill bit 2 during high-speed rotation, prevents the cutting fluid and the high-temperature environment from corroding and damaging the drill bit 2, thereby preventing the drill bit 2 from breaking and improving the service life of the drill bit 2.

[0034] The wear-resistant layer 31, high-temperature resistant layer 32 and corrosion-resistant layer 33 in the wear-resistant component 34 have different functions, so the materials required are also different. The wear-resistant layer 31 is an aluminum oxide layer, the high-temperature resistant layer 32 is a silicon nitride layer, and the corrosion-resistant layer 33 is a chromium silicon carbon layer.

[0035] The wear-resistant layer 31 is composed of aluminum oxide, which is a ceramic material with high hardness and good wear resistance. It can reduce the wear of the drill bit during the processing process and extend the service life of the tool. At the same time, it has a high melting point and remains stable in high temperature environments, which can reduce deformation or damage of the tool caused by high temperature. It is also resistant to most chemicals and does not easily react chemically with the processing material. It can protect the surface of the drill bit from corrosion and resist oxidation at high temperatures to maintain the performance of the drill bit. It has a low friction coefficient and can reduce the friction between the drill bit and the workpiece, reducing wear and cutting resistance. It can also adhere well to the drill bit surface and remain stable even under high-speed cutting and heavy load conditions. Alumina can increase the durability of the drill bit 2, increase the drilling speed, improve the smoothness of the hole wall, reduce maintenance costs, and ensure processing quality. Alumina has good wear resistance and certain high temperature resistance and corrosion resistance. Therefore, the wear-resistant layer 31 is composed of aluminum oxide and is provided on the substrate of the drill bit 2 as the bottom layer of the coating, so that the drill bit 2 can be used in certain high-temperature, highly acidic and highly alkaline environments.

[0036] The high-temperature resistant component is composed of silicon nitride, which is a high-temperature ceramic that can remain stable at extremely high temperatures and can effectively prevent oxidation and protect the base material. At the same time, it has a low thermal expansion coefficient and can adapt to environments with large temperature changes. It also has high hardness and wear resistance, which can effectively reduce wear and extend the service life of the collective material. It can improve the corrosion resistance of the collective material and enhance the compressive strength, bending strength and toughness of the collective material. Silicon nitride as a high-temperature resistant layer 32 can extend the service life of the drill bit 2, improve processing efficiency, improve the quality of the hole wall, reduce maintenance costs and improve processing quality.

[0037] The corrosion-resistant layer 33 is composed of chromium silicon carbon, which increases the wear resistance of the drill bit 2, reduces wear during the drilling process, and extends the service life of the drill bit 2, so that the drill bit 2 can resist the acidic environment and prevent the drill bit 2 from being corroded during the PCB manufacturing process. It also improves the hardness and toughness of the drill bit 2, making the drill bit 2 more durable and less prone to breakage during high-speed drilling. It also makes the surface of the drill bit 2 smoother, reduces friction and adhesion, improves drilling efficiency and hole wall quality, and reduces fatigue damage to the drill bit 2 under repeated stress, thereby increasing its overall service life. At the same time, it has excellent high-temperature resistance, can maintain stability during high-speed drilling, reduce performance degradation caused by high temperature, and help to quickly conduct heat, reducing performance degradation of the drill bit 2 caused by heat accumulation during the drilling process. Chrome silicon carbon as the corrosion-resistant layer 33 can extend the service life of the drill bit 2, improve drilling efficiency, improve hole wall quality, reduce maintenance costs, and improve processing quality.

[0038] The aluminum oxide and silicon nitride in the wear-resistant component 34 both have high hardness, which can enhance the wear resistance of the drill bit 2, while the chromium silicon carbon as the top layer can further resist wear. The chemical stability of each layer of material can work together to improve the durability of the drill bit 2 in a corrosive environment. The different thermal conductivities of each layer of material help to better disperse and conduct heat, reduce heat accumulation, and extend the service life of the drill bit 2. The stacked structure can provide higher mechanical stability and processing accuracy, reduce vibration during processing, and through multi-layer protection, the overall durability of the drill bit 2 will be significantly improved.

[0039] Furthermore, the thickness of the wear-resistant layer 31 is greater than 0.5 microns and less than 5 microns, the thickness of the high-temperature resistant layer 32 is greater than 1 micron and less than 10 microns, and the thickness of the corrosion-resistant layer 33 is greater than 0.1 micron and less than 1 micron.

[0040] The size range of the hole opened by the drill bit 2 is calculated when the drill bit 2 is formed. Adding a wear-resistant component 34 to the drill bit 2 will increase the size of the hole opened by the drill bit 2. In order to prevent the size of the hole opened by the drill bit 2 from being excessively affected, the thickness of the wear-resistant component 34 needs to be limited, and different materials need to be laid to a certain thickness to achieve the corresponding effect. Therefore, the thickness range of aluminum oxide as the wear-resistant layer 31 is 0.5 microns to 5 microns, the thickness range of silicon nitride as the high-temperature resistant layer 32 is 1 micron to 10 microns, the thickness range of the corrosion-resistant layer 33 is 0.1 microns to 1 micron, and the thickness range of the entire wear-resistant layer 31 component is 1 micron to 15 microns.

[0041] In order for the chip groove 21 to smoothly discharge waste chips, certain restrictions need to be placed on its shape and arrangement. Specifically, in an embodiment of the present invention, the multiple chip grooves 21 are symmetrical with the central axis of the drill bit 2 as the symmetry line, and the chip grooves 21 extend spirally along the axial direction of the drill bit 2.

[0042] The chip groove 21 extends in a spiral shape and can continuously guide the waste chips to move along the spiral path, so that the waste chips are continuously discharged, the possibility of head blockage is reduced, and the continuity and stability of the drilling process are improved. At the same time, there is a full bath of cutting fluid flowing along the spiral path, which can not only cool the drill bit 2 and the workpiece, but also flush the waste chips in the chip groove 21, further reducing the blockage of the drill bit 2 and improving the drilling quality. It can also reduce the contact between the drill bit 2 and the hole wall, reduce friction, and improve the service life and drilling quality of the drill bit 2.

[0043] The chip removal groove 21 is symmetrical with respect to the center line of the drill bit 2, so as to ensure uniform chip removal, avoid accumulation of drill chips around the drill bit 2, and reduce cutting resistance.

[0044] See also Figure 3, a reinforcing component 4 is provided on the wear-resistant component 3, and the reinforcing component 4 includes a reinforcing layer 41, a strengthening layer 42 and a reinforcement layer 43, wherein the reinforcing layer 41 is a cubic boron nitride layer, which is synthesized by hexagonal boron nitride and a catalyst under high temperature and high pressure. It is another new product that has appeared after the advent of artificial diamond. It has high hardness, thermal stability and chemical inertness, as well as excellent properties such as good infrared transmittance and wide bandgap width. Its hardness is second only to diamond, but its thermal stability is much higher than diamond, and it has greater chemical stability to iron-based metal elements. The grinding performance of cubic boron nitride abrasive tools is very excellent. It is not only capable of processing difficult-to-grind materials and improving productivity, but also effectively improving the grinding quality of workpieces. The reinforcing layer 42 is a polycrystalline diamond layer. Polycrystalline diamond is a superhard material composed of a large number of tiny diamond crystals bonded together through chemical vapor deposition or other high-temperature and high-pressure processes. Polycrystalline diamond has extremely high hardness, good wear resistance, and excellent thermal stability. The hardness of polycrystalline diamond is very high, second only to natural diamond, which makes it very suitable for processing hard materials. Secondly, it has excellent wear resistance, which can maintain the sharpness of cutting tools for a long time. Polycrystalline diamond has very good thermal stability and can maintain its performance even in high-speed cutting and high-temperature environments. Polycrystalline diamond material has good impact resistance and can remain stable under harsh processing conditions. Polycrystalline diamond has a low friction coefficient, which helps reduce heat generation during the cutting process, thereby improving the life of the cutting tool and processing quality. The reinforcement layer 43 is a metal-ceramic composite layer. Metal-ceramic composite materials are materials that combine metal and ceramic materials. They combine the advantages of both and have high hardness, high wear resistance, and good thermal stability. This material is usually prepared through processes such as powder metallurgy, hot pressing or hot isostatic pressing, which gives it good mechanical properties and wear resistance, and is widely used in industrial fields. Gold-ceramic composites have high hardness and wear resistance, which gives them a long service life in high temperature, high pressure and high wear application environments. Metal-ceramic composites can maintain their performance in high temperature environments, are not prone to thermal softening or thermal expansion, and are suitable for high-temperature processing processes. Metal-ceramic composites have high strength and toughness, can withstand large loads and impact forces, and are not prone to fracture. Good thermal conductivity and electrical conductivity: Gold-ceramic composites usually have good thermal conductivity and electrical conductivity, which gives them advantages in heat management and current transmission. Gold-ceramic composites have good corrosion resistance and can maintain their performance in harsh environments.

[0045] The size range of the hole opened by the drill bit 2 is calculated when the drill bit 2 is formed. Adding a wear-resistant component 34 to the drill bit 2 will increase the size of the hole opened by the drill bit 2. In order to prevent the size of the hole opened by the drill bit 2 from being excessively affected, the thickness of the reinforcing component 4 needs to be limited. The thickness of the reinforcing component 4 is greater than ten microns and less than thirty microns, wherein the thickness of the reinforcing layer 41 is greater than one micron and less than ten microns, the thickness of the strengthening layer 422 is greater than two microns and less than seven microns, and the thickness of the reinforcing layer 43 is greater than one micron and less than twelve microns.

[0046] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made based on the contents of the present invention specification and drawings, or direct / indirect application in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A PCB drill bit with a wear-resistant coating, characterized in that: include: Drill shank; A drill bit is provided on the drill shank and is provided with a plurality of chip removal grooves for removing waste chips; as well as, A wear-resistant component is arranged on the chip groove, and the wear-resistant component includes a wear-resistant layer, a high-temperature resistant layer and a corrosion-resistant layer. The wear-resistant layer is used to enhance the hardness of the chip groove, the high-temperature resistant layer is used to increase the melting point of the chip groove, and the corrosion-resistant layer is used to enhance the chemical stability of the chip groove, and the wear-resistant layer, the high-temperature resistant layer and the corrosion-resistant layer are stacked in sequence.

2. The PCB drill needle with wear-resistant coating according to claim 1, characterized in that: The wear-resistant layer is an aluminum oxide layer, the high-temperature resistant layer is a silicon nitride layer, and the corrosion-resistant layer is a chromium silicon carbon layer.

3. The PCB drill needle with wear-resistant coating according to claim 1, characterized in that: The thickness of the wear-resistant layer is greater than 0.5 microns and less than 5 microns.

4. The PCB drill needle with wear-resistant coating according to claim 1, characterized in that: The thickness of the high temperature resistant layer is greater than one micron and less than ten microns.

5. The PCB drill needle with wear-resistant coating according to claim 1, characterized in that: The thickness of the corrosion-resistant layer is greater than 0.1 micrometer and less than 1 micrometer.

6. The PCB drill needle with wear-resistant coating according to claim 1, characterized in that: The plurality of chip removal grooves are symmetrical about the central axis of the drill bit, and the chip removal grooves extend in a spiral shape along the axial direction of the drill bit.

7. The PCB drill needle with wear-resistant coating according to claim 1, characterized in that: A reinforcing component is provided on the wear-resistant component, and the reinforcing component includes a reinforcing layer, a strengthening layer and a reinforcement layer.

8. The PCB drill needle with wear-resistant coating according to claim 7, characterized in that: The strengthening layer is a cubic boron nitride layer, the strengthening layer is a polycrystalline diamond layer, and the enhancement layer is a metal-ceramic composite layer.

9. The PCB drill needle with wear-resistant coating according to claim 7, characterized in that: The thickness of the reinforcing component is greater than ten microns and less than thirty microns.

10. The PCB drill needle with wear-resistant coating according to claim 7, characterized in that: The thickness of the reinforcing layer is greater than one micron and less than ten microns, the thickness of the strengthening layer is greater than two microns and less than seven microns, and the thickness of the enhancing layer is greater than one micron and less than twelve microns.

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