A lubricating backing plate for M9 core plate drilling and a preparation method thereof

Abstract

The application provides a lubricating base plate for M9 core plate drilling and a preparation method thereof, and the preparation method comprises the following steps: obtaining a medium density plate, and pretreating the surface of the medium density plate; configuring a lubricating coating solution, wherein the lubricating coating solution comprises an aqueous acrylic copolymer resin and solid lubricating particles; coating the lubricating coating solution on the surface of the medium density plate; and curing the lubricating coating solution at 60-80 DEG C to form a lubricating coating layer on the surface of the medium density plate; and in the drilling process, the lubricating coating layer is in abutment with the M9 core plate. The application utilizes the phenomenon that the aqueous acrylic copolymer resin is softened again at high temperature after low-temperature curing, so that the internal solid lubricating particles are separated to the position of the drill under the action of high shear force of the drill, solid particle lubrication to the drill is formed, the lubrication to the drill is realized, and then the tearing and pulling at the drilling outlet in the M9 core plate are effectively reduced, burrs at the drilling outlet are reduced, the wear of the drill is effectively reduced, and the service life of the drill is prolonged.

Description

Technical Field

[0001] This invention relates to the technical field of drilling M9 core boards, and more particularly to a lubricating pad for drilling M9 core boards and its preparation method. Background Technology

[0002] The M9 core board is suitable for high-frequency, high-speed signal transmission. Compared to traditional core boards, it has higher rigidity and higher requirements for hole wall and depth accuracy. To improve drilling accuracy, a cover plate is usually placed on top of the M9 core board and a backing plate is placed below it. During drilling, the drill bit passes through the cover plate and the M9 core board in sequence, and reaches the backing plate to complete the entire drilling process. The backing plate can be penetrated, or it can be partially penetrated within the backing plate.

[0003] Because the M9 core board has higher hardness, the wear on the drill bit is more severe compared to ordinary core boards. Furthermore, the heat generated during drilling by friction between the drill bit and the M9 core board is greater. When the drill bit penetrates the M9 core board and comes into contact with the backing plate, the high temperature generated will burn the ordinary backing plate, affecting its service life. In addition, the existing ordinary backing plate cannot dissipate heat and lubricate the drill bit that penetrates the M9 core board in time, which also affects the service life of the drill bit. Summary of the Invention

[0004] This invention aims to at least partially solve one of the problems in related technologies. Therefore, one objective of this invention is to provide a method for preparing a lubricating pad for drilling M9 core boards. This method utilizes the phenomenon of water-based acrylic copolymer resin undergoing low-temperature curing followed by high-temperature re-softening, causing internal solid lubricating particles to precipitate at the drill bit location under the high shear force of the drill bit. This forms solid particle lubrication of the drill bit, effectively reducing tearing and pulling at the drill exit point in the M9 core board, reducing burrs at the drill exit point, effectively reducing drill bit wear, and improving drill bit life. A method for preparing a lubricating pad for drilling holes in an M9 core board, comprising: Obtain medium-density fiberboard (MDF) and pretreat its surface. A lubricating coating solution is prepared, wherein the lubricating coating solution comprises an aqueous acrylic copolymer resin and solid lubricating particles; A lubricating coating solution is applied to the surface of a medium-density fiberboard (MDF); the lubricating coating solution is cured at 60-80°C to form a lubricating coating on the surface of the MDF; during drilling, the lubricating coating comes into contact with the M9 core board.

[0005] Further, the lubricating coating solution comprises the following components in parts by weight: 10-50 parts deionized water, 40-50 parts waterborne acrylic copolymer resin, 10-15 parts solid lubricating particles, 5-10 parts ethanol, 2-5 parts glycerin, 1-3 parts silane coupling agent, and 0.5-1 part defoamer.

[0006] Furthermore, the solid lubricating particles comprise flake graphite and flake hexagonal boron nitride.

[0007] Furthermore, the lubricating coating solution is prepared, specifically including: Aqueous acrylic copolymer resin, ethanol, glycerin and defoamer are mixed evenly to obtain solution A; Solid lubricating particles were soaked in a silane coupling agent dilution solution and then dried. Solid lubricating particles are added to solution A in several batches; the mixture is stirred thoroughly after each addition to obtain a lubricating coating solution. The viscosity of the lubricating coating solution is adjusted to a preset range using deionized water.

[0008] Furthermore, the thickness of the lubricating coating on the surface of the medium-density fiberboard is 15-20 micrometers.

[0009] Furthermore, the lubricating coating solution undergoes incomplete cross-linking and curing at 60-80°C. During the drilling process of the M9 core board, the high temperature generated during drilling causes the water-based acrylic copolymer resin to soften and undergo micro-melting. Consequently, the solid lubricating particles inside are precipitated at the drill bit position under the high shear force of the drill bit, forming solid particle lubrication for the drill bit.

[0010] Furthermore, the high temperature generated by the drilling is greater than the incomplete cross-linking curing temperature of the lubricating coating.

[0011] Furthermore, the method for preparing the medium-density fiberboard includes: After the wood chips are softened by steaming, they are sheared and kneaded by the grinding discs in a hot mill, and then transformed into fine fibers of 0.5-3mm. The fine fibers are dried to a moisture content of 6%-12% using an airflow dryer; during the drying process, epoxy resin adhesive is added to the fine fibers by atomized spraying. The dried fine fibers are hot-pressed to form the medium-density fiberboard.

[0012] Furthermore, the surface of the medium-density fiberboard (MDF) undergoes pretreatment, specifically including: Use sandpaper to remove dust and oil stains from the surface of the medium-density fiberboard (MDF). Wipe the surface of the medium density board with acetone or ethanol, and then dry it by blowing with dry compressed air.

[0013] The second objective of this application is to provide a lubricating pad for drilling holes in an M9 core board, which is prepared based on the preparation method described above.

[0014] The technical solutions provided in this application have the following advantages compared with the prior art: This application involves coating a lubricating solution onto the surface of a medium-density fiberboard (MDF) and curing the solution at 60-80°C. Since the lubricating solution uses a water-based acrylic copolymer resin, it undergoes incomplete cross-linking curing at a low temperature of 60-80°C. During subsequent drilling, because the lubricating coating directly contacts the M9 core board, when the drill bit penetrates the M9 core board and enters the lubricating coating, the high temperature generated by the friction between the drill bit and the M9 core board is rapidly dispersed within the lubricating coating by solid lubricating particles. This causes the surrounding water-based acrylic copolymer resin to soften and undergo micro-melting, resulting in the internal solid lubricating particles precipitating at the drill bit location under the high shear force of the drill bit. This forms solid particle lubrication of the drill bit, achieving lubrication and timely heat dissipation, preventing the drill bit from carrying a high-temperature burning pad. Simultaneously, the drill bit immediately contacts the lubricating coating upon penetrating the M9 core board, effectively reducing tearing and pulling at the drill exit point, reducing burrs at the drill exit point, effectively reducing wear on the drill bit, and improving drill bit life.

[0015] This application also provides a lubrication pad for drilling M9 core boards, which can reduce drill bit wear and extend drill bit life; achieve effective lubrication of the drill bit after drilling, improve the heat dissipation performance and service life of the pad, and improve drilling accuracy. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] In the attached image: Figure 1 This is a schematic diagram showing the positions of the drill bit, M9 core board, and lubrication pad in this application.

[0019] Reference numerals: 1. Drill bit; 2. Medium density board; 3. Lubricating coating; 4. M9 core board. Detailed Implementation

[0020] To provide a clearer understanding of the technical features, objectives, and effects of this invention, specific embodiments are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "upper," "lower," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the referred mechanism or element must have a specific orientation; therefore, they should not be construed as limitations on this invention.

[0021] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "linking," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. When an component is referred to as being "on" or "below" another component, the component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," "third," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0022] In the following description, specific details such as particular system structures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, mechanisms, circuits, and methods are omitted so as not to obscure the description of the invention with unnecessary detail.

[0023] A method for preparing a lubricating pad for drilling holes in an M9 core board, comprising: S1: Obtain medium-density fiberboard 2 and pre-treat the surface of medium-density fiberboard 2.

[0024] The method for preparing the density board 2 in this application includes: S11: After the wood chips are steamed and softened, they are sheared and kneaded by a hot mill and transformed into fine fibers of 0.5-3mm. S12: The fine fibers are dried to a moisture content of 6%-12% using an airflow dryer; during the drying process, epoxy resin adhesive is added to the fine fibers via atomized spraying. Spraying epoxy resin during the drying process allows the epoxy resin to be evenly dispersed on the surface of the fine fibers. At the same time, the epoxy resin can form strong chemical covalent bonds and physical bonds with the carbon fibers, which is helpful for the subsequent coating of nanofibers onto the surface of medium density board 2.

[0025] S13: The dried fine fibers are hot-pressed to form the medium-density fiberboard 2. Specifically, this includes: firstly, using a vacuum airflow to achieve preliminary fiber forming, then using a pre-pressing machine to achieve densification of the medium-density fiberboard 2, and finally using a hot press to cure the epoxy resin adhesive to form a medium-density fiberboard 2 of a preset thickness. At this time, epoxy resin adhesive remains on the surface of the medium-density fiberboard 2.

[0026] The pretreatment for medium-density fiberboard 2 includes: Use sandpaper to remove dust and oil stains from the surface of medium-density fiberboard 2; Wipe the surface of medium-density fiberboard 2 with acetone or ethanol, and then dry it by blowing with dry compressed air. Medium-density fiberboard 2 is made of pressed fibers and has a porous internal structure. Drying with dry compressed air ensures that there are no residual impurities in the pores, thereby improving the permeability of the subsequent lubricating coating solution on the surface of medium-density fiberboard 2.

[0027] S2: Prepare a lubricating coating solution, wherein the lubricating coating solution comprises the following components in parts by weight: 10-50 parts deionized water, 40-50 parts waterborne acrylic copolymer resin, 10-15 parts solid lubricating particles, 5-10 parts ethanol, 2-5 parts glycerol, 1-3 parts silane coupling agent, and 0.5-1 part defoamer. The solid lubricating particles are flake graphite and flake hexagonal boron nitride; specifically, 8-10 parts flake graphite and 5-8 parts flake hexagonal boron nitride. Deionized water is used to adjust the viscosity of the lubricating coating solution, and ethanol is used to enhance the solubility of the lubricating coating solution and accelerate the subsequent curing effect of the lubricating coating solution; flake graphite refers to flake graphite micropowder, and both the flake graphite micropowder and flake hexagonal boron nitride have a flake structure and are uniformly dispersed in the waterborne acrylic copolymer resin. Waterborne acrylic copolymer resin can undergo incomplete cross-linking at low temperatures and softens and slightly melts at high temperatures. Under the high-speed rotational shear force of drill bit 1, solid lubricating particles inside it are precipitated to the position of drill bit 1, thereby achieving lubrication of drill bit 1 by solid particles.

[0028] Specifically, it includes: S21: Mix water-based acrylic copolymer resin, ethanol, glycerin and defoamer evenly to obtain solution A; S22: Soak solid lubricating particles in a silane coupling agent dilution solution and then dry them; S23: Add the solid lubricating particles to solution A in multiple batches; stir thoroughly after each addition to obtain a lubricating coating solution; S24: Adjust the viscosity of the lubricating coating solution to a preset range using deionized water.

[0029] S3: Apply a lubricating coating solution to the surface of medium-density fiberboard 2; cure the lubricating coating solution at 60-80°C to form a lubricating coating 3 on the surface of the medium-density fiberboard 2; during the drilling process, the lubricating coating 3 abuts against the M9 core board 4.

[0030] like Figure 1 As shown, during the subsequent drilling process, since the lubricating coating 3 directly contacts the M9 core plate 4, when the drill bit 1 penetrates the M9 core plate 4 and enters the lubricating coating 3, the high temperature generated by the friction between the drill bit 1 and the M9 core plate 4 is quickly dispersed within the lubricating coating 3 by solid lubricating particles. This causes the surrounding water-based acrylic copolymer resin to soften and undergo micro-melting. Consequently, the solid lubricating particles inside are precipitated to the drill bit 1 position under the high shear force of the drill bit 1, forming solid particle lubrication for the drill bit 1. This lubrication and timely heat dissipation prevent the drill bit 1 from carrying a high-temperature burning pad. At the same time, the drill bit 1 immediately contacts the lubricating coating 3 upon penetrating the M9 core plate 4, which can effectively reduce tearing and pulling at the drill exit point in the M9 core plate 4, reduce burrs at the drill exit point, effectively reduce wear on the drill bit 1, and improve the life of the drill bit 1.

[0031] In this application, glycerol is added to the lubricating coating 3, which can ensure that the temperature at which the surface of the lubricating coating 3 softens during the drilling process is reduced, and that the temperature generated during the drilling process between the drill bit 1 and the M9 core board is sufficient to cause the lubricating coating 3 to soften and undergo micro-melting, thereby accelerating the precipitation of solid lubricating particles in the lubricating coating 3.

[0032] In this application, both the flake graphite powder and the flake hexagonal boron nitride have good thermal conductivity. When the drill bit 1 comes into contact with the lubricating coating 3, the heat carried by the drill bit 1 is quickly dispersed in the area around the drilling position through the flake graphite powder and the flake hexagonal boron nitride. This causes the waterborne acrylic copolymer resin in this area to soften and deform. In addition, the high shear force of the drill bit 1 in the lubricating coating 3 causes the flake graphite powder and the flake hexagonal boron nitride to form a moving channel in the softened and deformed waterborne acrylic copolymer resin, which completes the rearrangement and movement, and moves and precipitates in the direction of the drill bit 1, forming solid particle lubrication for the drill bit 1, effectively reducing the wear of the drill bit 1.

[0033] In this application, the solvent for the lubricating coating 3 is formed by dissolving the water-based acrylic copolymer resin and deionized water. After the medium-density fiberboard 2 is pressed and dried, it has a porous internal structure. The water-soluble resin can penetrate into the interior of the medium-density fiberboard 2, forming a tight bond between the lubricating coating 3 and the medium-density fiberboard 2, thus preventing the lubricating coating 3 from falling off and affecting the drilling effect.

[0034] This application also provides a lubrication pad for drilling M9 core boards, which is prepared based on the preparation method described above. It can reduce the wear of the drill bit 1 and extend the life of the drill bit 1; it can achieve effective lubrication of the drill bit 1 after drilling, improve the heat dissipation performance and service life of the pad, and improve the drilling accuracy.

[0035] Example 1

[0036] This embodiment provides a method for preparing a lubricating pad for drilling holes in an M9 core board, comprising: S1: Obtain medium-density fiberboard and pre-treat the surface of the medium-density fiberboard.

[0037] The method for preparing the density board in this application includes: S11: After the wood chips are steamed and softened, they are sheared and kneaded by a hot mill and transformed into fine fibers of 0.5-3mm. S12: The fine fibers are dried to a moisture content of 6%-12% using an airflow dryer. During the drying process, epoxy resin adhesive is added to the fine fibers via atomized spraying. Spraying epoxy resin during the drying process allows the epoxy resin to be evenly dispersed on the surface of the fine fibers. At the same time, the epoxy resin can form strong chemical covalent bonds and physical bonds with the carbon fibers, which is helpful for the subsequent coating of carbon nanofibers onto the surface of medium-density fiberboard.

[0038] S13: The dried fine fibers are hot-pressed to form the medium-density fiberboard (MDF). Specifically, this includes: first, using a vacuum airflow to achieve preliminary fiber shaping; then, using a pre-press to achieve MDF compaction; and finally, using a hot press to cure the epoxy resin adhesive, forming an MDF of a predetermined thickness. At this point, epoxy resin adhesive remains on the surface of the MDF.

[0039] The pretreatment of medium-density fiberboard in this step includes: Use sandpaper to remove dust and oil stains from the surface of the medium-density fiberboard (MDF). Wipe the surface of the medium-density fiberboard (MDF) with acetone or ethanol, then dry it by blowing with dry compressed air. MDF is made of pressed fibers and has a porous internal structure. Drying with dry compressed air ensures that no impurities remain in the pores, improving the permeability of the subsequent lubricating coating solution on the MDF surface.

[0040] S2: Prepare a lubricating coating solution, wherein the lubricating coating solution comprises the following components in parts by weight: 40 parts water-based acrylic copolymer resin, 10 parts flake graphite, 5 parts flake hexagonal boron nitride, 10 parts ethanol, 2 parts glycerol, 3 parts silane coupling agent, 0.5 parts defoamer, and a certain amount of deionized water, used to adjust the viscosity of the lubricating coating solution to 2000-2200 cP. Specifically, it includes: S21: Mix water-based acrylic copolymer resin, ethanol, glycerin and defoamer evenly to obtain solution A; S22: Soak solid lubricating particles in a silane coupling agent dilution solution and then dry them; S23: Add the solid lubricating particles to solution A in multiple batches; stir thoroughly after each addition to obtain a lubricating coating solution; S24: Adjust the viscosity of the lubricating coating solution to a preset range using deionized water.

[0041] S3: Apply the lubricating coating solution to the surface of the medium-density fiberboard using a scraper; cure the lubricating coating solution with incomplete cross-linking at 60-80°C to form a lubricating coating on the surface of the medium-density fiberboard; When the lubricating pad is placed at the drilling station, the lubricating coating comes into contact with the M9 core board.

[0042] Example 2

[0043] This embodiment provides a method for preparing a lubricating pad for drilling holes in an M9 core board, comprising: S1: Obtain medium-density fiberboard and pre-treat the surface of the medium-density fiberboard.

[0044] The method for preparing the density board in this application includes: S11: After the wood chips are steamed and softened, they are sheared and kneaded by a hot mill and transformed into fine fibers of 0.5-3mm. S12: The fine fibers are dried to a moisture content of 6%-12% using an airflow dryer. During the drying process, epoxy resin adhesive is added to the fine fibers via atomized spraying. Spraying epoxy resin during the drying process allows the epoxy resin to be evenly dispersed on the surface of the fine fibers. At the same time, the epoxy resin can form strong chemical covalent bonds and physical bonds with the carbon fibers, which is helpful for the subsequent coating of carbon nanofibers onto the surface of medium-density fiberboard.

[0045] S13: The dried fine fibers are hot-pressed to form the medium-density fiberboard (MDF). Specifically, this includes: first, using a vacuum airflow to achieve preliminary fiber shaping; then, using a pre-press to achieve MDF compaction; and finally, using a hot press to cure the epoxy resin adhesive, forming an MDF of a predetermined thickness. At this point, epoxy resin adhesive remains on the surface of the MDF.

[0046] The pretreatment of medium-density fiberboard in this step includes: Use sandpaper to remove dust and oil stains from the surface of the medium-density fiberboard (MDF). Wipe the surface of the medium-density fiberboard (MDF) with acetone or ethanol, then dry it by blowing with dry compressed air. MDF is made of pressed fibers and has a porous internal structure. Drying with dry compressed air ensures that no impurities remain in the pores, improving the permeability of the subsequent lubricating coating solution on the MDF surface.

[0047] S2: Prepare a lubricating coating solution, wherein the lubricating coating solution comprises the following components in parts by weight: 50 parts water-based acrylic copolymer resin, 8 parts flake graphite, 8 parts flake hexagonal boron nitride, 5 parts ethanol, 5 parts glycerin, 1 part silane coupling agent, 1 part defoamer, and a certain amount of deionized water, used to adjust the viscosity of the lubricating coating solution to 2000-2200 cP. Specifically, it includes: S21: Mix water-based acrylic copolymer resin, ethanol, glycerin and defoamer evenly to obtain solution A; S22: Soak solid lubricating particles in a silane coupling agent dilution solution and then dry them; S23: Add the solid lubricating particles to solution A in multiple batches; stir thoroughly after each addition to obtain a lubricating coating solution; S24: Adjust the viscosity of the lubricating coating solution to a preset range using deionized water.

[0048] S3: Apply the lubricating coating solution to the surface of the medium-density fiberboard using a scraper; cure the lubricating coating solution with incomplete cross-linking at 60-80°C to form a lubricating coating on the surface of the medium-density fiberboard; When the lubricating pad is placed at the drilling station, the lubricating coating comes into contact with the M9 core board.

[0049] Example 3

[0050] This embodiment provides a method for preparing a lubricating pad for drilling holes in an M9 core board, comprising: S1: Obtain medium-density fiberboard and pre-treat the surface of the medium-density fiberboard.

[0051] The method for preparing the density board in this application includes: S11: After the wood chips are steamed and softened, they are sheared and kneaded by a hot mill and transformed into fine fibers of 0.5-3mm. S12: The fine fibers are dried to a moisture content of 6%-12% using an airflow dryer. During the drying process, epoxy resin adhesive is added to the fine fibers via atomized spraying. Spraying epoxy resin during the drying process allows the epoxy resin to be evenly dispersed on the surface of the fine fibers. At the same time, the epoxy resin can form strong chemical covalent bonds and physical bonds with the carbon fibers, which is helpful for the subsequent coating of carbon nanofibers onto the surface of medium-density fiberboard.

[0052] S13: The dried fine fibers are hot-pressed to form the medium-density fiberboard (MDF). Specifically, this includes: first, using a vacuum airflow to achieve preliminary fiber shaping; then, using a pre-press to achieve MDF compaction; and finally, using a hot press to cure the epoxy resin adhesive, forming an MDF of a predetermined thickness. At this point, epoxy resin adhesive remains on the surface of the MDF.

[0053] The pretreatment of medium-density fiberboard in this step includes: Use sandpaper to remove dust and oil stains from the surface of the medium-density fiberboard (MDF). Wipe the surface of the medium-density fiberboard (MDF) with acetone or ethanol, then dry it by blowing with dry compressed air. MDF is made of pressed fibers and has a porous internal structure. Drying with dry compressed air ensures that no impurities remain in the pores, improving the permeability of the subsequent lubricating coating solution on the MDF surface.

[0054] S2: Prepare a lubricating coating solution, wherein the lubricating coating solution comprises the following components in parts by weight: 45 parts water-based acrylic copolymer resin, 9 parts flake graphite, 7 parts flake hexagonal boron nitride, 8 parts ethanol, 3 parts glycerol, 2 parts silane coupling agent, 0.8 parts defoamer, and a certain amount of deionized water, used to adjust the viscosity of the lubricating coating solution to 2000-2200 cP. Specifically, it includes: S21: Mix water-based acrylic copolymer resin, ethanol, glycerin and defoamer evenly to obtain solution A; S22: Soak solid lubricating particles in a silane coupling agent dilution solution and then dry them; S23: Add solid lubricating particles to solution A in multiple batches; stir thoroughly after each addition to form a lubricating coating solution; S24: Adjust the viscosity of the lubricating coating solution to a preset range using deionized water.

[0055] S3: Apply the lubricating coating solution to the surface of the medium-density fiberboard using a scraper; cure the lubricating coating solution with incomplete cross-linking at 60-80°C to form a lubricating coating on the surface of the medium-density fiberboard; When the lubricating pad is placed at the drilling station, the lubricating coating comes into contact with the M9 core board.

[0056] Comparative Example 1 Comparative Example 1 provides a method for preparing a lubricating pad for drilling holes in an M9 core board, comprising: S1: Obtain medium-density fiberboard and pre-treat the surface of the medium-density fiberboard.

[0057] The method for preparing the density board in this application includes: S11: After the wood chips are steamed and softened, they are sheared and kneaded by a hot mill and transformed into fine fibers of 0.5-3mm. S12: The fine fibers are dried to a moisture content of 6%-12% using an airflow dryer. During the drying process, epoxy resin adhesive is added to the fine fibers via atomized spraying. Spraying epoxy resin during the drying process allows the epoxy resin to be evenly dispersed on the surface of the fine fibers. At the same time, the epoxy resin can form strong chemical covalent bonds and physical bonds with the carbon fibers, which is helpful for the subsequent coating of carbon nanofibers onto the surface of medium-density fiberboard.

[0058] S13: The dried fine fibers are hot-pressed to form the medium-density fiberboard (MDF). Specifically, this includes: first, using a vacuum airflow to achieve preliminary fiber shaping; then, using a pre-press to achieve MDF compaction; and finally, using a hot press to cure the epoxy resin adhesive, forming an MDF of a predetermined thickness. At this point, epoxy resin adhesive remains on the surface of the MDF.

[0059] The pretreatment of medium-density fiberboard in this step includes: Use sandpaper to remove dust and oil stains from the surface of the medium-density fiberboard (MDF). Wipe the surface of the medium-density fiberboard (MDF) with acetone or ethanol, then dry it by blowing with dry compressed air. MDF is made of pressed fibers and has a porous internal structure. Drying with dry compressed air ensures that no impurities remain in the pores, improving the permeability of the subsequent lubricating coating solution on the MDF surface.

[0060] S2: Prepare a lubricating coating solution, wherein the lubricating coating solution comprises the following components in parts by weight: 45 parts water-based acrylic copolymer resin, 8 parts ethanol, 3 parts glycerol, 2 parts silane coupling agent, 0.8 parts defoamer, and a certain amount of deionized water, used to adjust the viscosity of the lubricating coating solution to 2000-2200 cP. Specifically, it includes: S21: Mix water-based acrylic copolymer resin, ethanol, glycerin and defoamer evenly to obtain solution A; S22: Adjust the viscosity of the lubricating coating solution to a preset range using deionized water.

[0061] S3: Apply the lubricating coating solution to the surface of the medium-density fiberboard using a scraper; cure the lubricating coating solution with incomplete cross-linking at 60-80°C to form a lubricating coating on the surface of the medium-density fiberboard; When the lubricating pad is placed at the drilling station, the lubricating coating comes into contact with the M9 core board.

[0062] Comparative Example 2 The comparative example used the same medium-density fiberboard as in Example 3 as the drilling pad.

[0063] Experimental Example The M9 core board was used as the drilling object, and a PCD polycrystalline diamond drill bit was used. The drilling diameter was 0.4 mm. The backing plates in Example 1, Example 2, Example 3, Comparative Document 1 and Comparative Example 2 were used as the backing plates for drilling, and each was drilled 1000 times.

[0064] Calculate the radial wear of the drill bit edge after drilling, where radial wear = (D2 - D1) / 2, D2 refers to the outer diameter of the drill bit after drilling, and D1 refers to the outer diameter of the drill bit before drilling. The obtained data are shown in Table 1: Table 1 Performance test results of M9 core board through drilling with different cover plates.

[0065] It can be seen that the backing plate in this application can effectively alleviate drill bit wear during the drilling process of the M9 core board. Drill bit wear is greater with a backing plate that does not contain solid lubricating particles or a lubricating coating. In this application, when the drill bit comes into contact with the lubricating coating, the heat carried by the drill bit is quickly dispersed in the area around the drilling location through the flake graphite powder and flake hexagonal boron nitride. This causes the waterborne acrylic copolymer resin in this area to soften and deform. In addition, the high shear force of the drill bit in the lubricating coating causes the flake graphite powder and flake hexagonal boron nitride to form moving channels in the softened and deformed waterborne acrylic copolymer resin, completing the rearrangement and movement, and precipitating towards the drill bit, forming solid particle lubrication for the drill bit, effectively reducing drill bit wear.

[0066] It is understood that the above embodiments only illustrate preferred embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can freely combine the above technical features without departing from the concept of the present invention, and can also make several modifications and improvements, all of which fall within the protection scope of the present invention. Therefore, all equivalent transformations and modifications made with respect to the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A method for preparing a lubricating pad for drilling holes in an M9 core board, characterized in that, include: Obtain medium-density fiberboard (MDF) and pretreat its surface. A lubricating coating solution is prepared, wherein the lubricating coating solution comprises an aqueous acrylic copolymer resin and solid lubricating particles; A lubricating coating solution is applied to the surface of a medium-density fiberboard (MDF); the lubricating coating solution is cured at 60-80°C to form a lubricating coating on the surface of the MDF; during drilling, the lubricating coating comes into contact with the M9 core board.

2. The method for preparing a lubricating pad for drilling M9 core boards according to claim 1, characterized in that, The lubricating coating solution comprises the following components in parts by weight: 10-50 parts deionized water, 40-50 parts waterborne acrylic copolymer resin, 10-15 parts solid lubricating particles, 5-10 parts ethanol, 2-5 parts glycerin, 1-3 parts silane coupling agent, and 0.5-1 part defoamer.

3. The method for preparing a lubricating pad for drilling M9 core boards according to claim 2, characterized in that, The solid lubricating particles include flake graphite and flake hexagonal boron nitride.

4. The method for preparing a lubricating pad for drilling M9 core boards according to claim 2, characterized in that, The preparation of the lubricating coating solution specifically includes: Aqueous acrylic copolymer resin, ethanol, glycerin and defoamer are mixed evenly to obtain solution A; Solid lubricating particles were soaked in a silane coupling agent dilution solution and then dried. Solid lubricating particles are added to solution A in several batches; the mixture is stirred thoroughly after each addition to obtain a lubricating coating solution. The viscosity of the lubricating coating solution is adjusted to a preset range using deionized water.

5. The method for preparing a lubricating pad for drilling M9 core boards according to claim 1, characterized in that, The thickness of the lubricating coating on the surface of the medium-density fiberboard is 15-20 micrometers.

6. The method for preparing a lubricating pad for drilling M9 core boards according to claim 1, characterized in that, The lubricating coating solution undergoes incomplete cross-linking and curing at 60-80℃. During the drilling process of the M9 core board, the high temperature generated during drilling causes the water-based acrylic copolymer resin to soften and undergo micro-melting. Consequently, the solid lubricating particles inside are precipitated at the drill bit position under the high shear force of the drill bit, forming solid particle lubrication for the drill bit.

7. A method for preparing a lubricating pad for drilling M9 core boards according to claim 6, characterized in that, The high temperature generated by the drilling is greater than the incomplete cross-linking curing temperature of the lubricating coating.

8. The method for preparing a lubricating pad for drilling M9 core boards according to claim 1, characterized in that, The method for preparing the medium-density fiberboard includes: After the wood chips are softened by steaming, they are sheared and kneaded by the grinding discs in a hot mill, and then transformed into fine fibers of 0.5-3mm. The fine fibers are dried to a moisture content of 6%-12% using an airflow dryer; during the drying process, epoxy resin adhesive is added to the fine fibers by atomized spraying. The dried fine fibers are hot-pressed to form the medium-density fiberboard.

9. A method for preparing a lubricating pad for drilling M9 core boards according to claim 8, characterized in that, Pretreatment of the medium-density fiberboard surface includes: Use sandpaper to remove dust and oil stains from the surface of the medium-density fiberboard (MDF). Wipe the surface of the medium density board with acetone or ethanol, and then dry it by blowing with dry compressed air.

10. A lubricating pad for drilling holes in an M9 core board, characterized in that, Prepared according to the preparation method described in any one of claims 1-9.

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