Method for manufacturing a coated abrasive belt

Abstract

The application provides a preparation method of a composite abrasive belt, comprising the following steps: mixing abrasive particles and an adhesive to obtain a mixed adhesive abrasive; providing a mold, the mold being provided with abrasive particle grooves in a preset arrangement in a film forming area of the mold, the mold being provided with a cavity corresponding to the film forming area, the cavity being filled with heat-conducting liquid, and the mixed adhesive abrasive being coated on the film forming area to form an abrasive layer; controlling the hydraulic pressure of the heat-conducting liquid to be less than or equal to a preset threshold value, so that the surface of the mold corresponding to the film forming area remains flat; coating a primer on the surface of a belt base material; pressing the mold on the belt base material, and simultaneously pressurizing the heat-conducting liquid to a hydraulic pressure greater than the preset threshold value, so that the surface of the mold corresponding to the film forming area elastically deforms, the abrasive layer is demolded from the mold, and the abrasive layer is tightly bonded on the belt base material to obtain the composite abrasive belt. The application solves the problem of difficult demolding of the abrasive particles by using elastic deformation of the mold, so that continuous production of the composite abrasive belt is realized.

Description

Technical Field

[0001] This invention relates to the field of abrasive belt technology, and in particular to a method for preparing a composite abrasive belt. Background Technology

[0002] Currently, with the rapid development of cutting-edge technologies such as aerospace instruments and precision equipment, and semiconductor chips, efficient and precise grinding technology for materials has become a key bottleneck restricting the development of high-end manufacturing. Among these technologies, abrasives are the most influential factor on processing quality in the field of grinding. Traditional single-grain grinding has low efficiency and poor workpiece surface quality, making it difficult to meet the development needs of high-precision, high-speed, and high-efficiency grinding technologies.

[0003] Composite abrasives are a type of composite abrasive material, consisting of multiple tiny abrasive particles bonded together by an adhesive to form an independent abrasive composite of a specific shape and size. They offer significant advantages in high-efficiency and high-quality grinding. However, the innovation and development of composite abrasive belts are currently not ideal, especially regarding the insufficient research and development of specialized abrasive belts for wood processing. The following problems exist: the belt preparation process is cumbersome and complex; the abrasive particle clusters after breakage have poor uniformity in shape, affecting the stability and uniformity of the belt during grinding, thus impacting grinding quality and processing accuracy. To address this, a fixed-configuration abrasive belt has been proposed. While this fixed-configuration belt can arrange composite abrasive particles regularly on the belt surface to improve grinding performance, it employs a pre-forming and post-granulation process. This process limits the degree of automation in production, making large-scale automated production difficult and unable to meet the large market demand for composite abrasive belts for wood processing. Furthermore, if a pre-granulation and post-forming process is adopted, the technical challenge of abrasive particle demolding remains.

[0004] Therefore, it is necessary to provide a new technical solution to solve the above-mentioned technical problems. Summary of the Invention

[0005] This invention provides a method for preparing composite abrasive belts, which solves the problems of difficult abrasive grain demolding and inability to achieve continuous production in existing composite abrasive belt manufacturing processes.

[0006] This invention provides a method for preparing composite abrasive belts, comprising the following steps: Abrasive grains are mixed with adhesive and allowed to stand to obtain a mixed abrasive. A mold is provided, with a film-forming area on one side surface. The film-forming area has a plurality of abrasive grooves arranged in a preset pattern. The mold has a cavity corresponding to the position of the film-forming area, and the cavity is filled with a heat-conducting liquid. The mixed abrasive is coated onto the film-forming area to form an abrasive layer. The hydraulic pressure of the heat-conducting fluid is controlled to be less than or equal to a preset threshold so that the surface of the mold corresponding to the film-forming area remains flat; Apply a primer to the surface of the abrasive belt substrate; The mold is pressed onto the abrasive belt substrate with the abrasive layer facing the substrate, and the heat-conducting liquid is pressurized to a pressure greater than the preset threshold, causing the surface of the mold corresponding to the film-forming area to undergo elastic deformation, so that the abrasive layer is demolded from the mold and tightly adhered to the abrasive belt substrate, thereby producing a composite abrasive belt.

[0007] Optionally, the preset threshold is a critical pressure value that causes elastic deformation of the surface of the mold corresponding to the film-forming area.

[0008] Optionally, the step of coating the mixed abrasive onto the film-forming area includes: The mixed abrasive is applied to the film-forming area by scraping, so that the abrasive groove is filled with the mixed abrasive, and then scraped flat to form an abrasive layer of a preset thickness.

[0009] Optionally, before coating the mixed abrasive onto the film-forming region, the method further includes the following steps: A release agent is sprayed onto the film-forming area.

[0010] Optionally, after the mixed abrasive is coated onto the film-forming area and before the primer is applied to the surface of the abrasive belt substrate, the following steps are further included: The heat-conducting fluid is heated and maintained at 60 °C, and the abrasive layer is heated for 1 minute to initially shape the abrasive layer.

[0011] Optionally, after obtaining the composite abrasive belt, the following steps are also included: The composite abrasive belt was dried at 70°C for 20 minutes and then dehumidified. The composite abrasive belt is dried again at 90°C for 40 minutes to complete the shaping process.

[0012] Optionally, the mixed abrasive is prepared by mixing the abrasive grains and the adhesive in a 1:3 ratio, and the adhesive is prepared by mixing polyurethane emulsion and phenolic resin adhesive in a 1:20 ratio.

[0013] The present invention also provides a composite abrasive belt, which is made by the above-mentioned method for preparing composite abrasive belt. The composite abrasive belt includes a belt substrate and an abrasive layer disposed on the surface of the belt substrate. The surface of the abrasive layer is provided with grinding units protruding along the surface of the belt substrate, and a gap is provided between adjacent grinding units.

[0014] The present invention also provides a mold for preparing composite abrasive belts, comprising a mold body and a heat-conducting liquid. A film-forming area is provided on one side surface of the mold body, and a plurality of abrasive grooves arranged in a preset arrangement rule are provided in the film-forming area. A cavity is provided inside the mold corresponding to the position of the film-forming area, and the heat-conducting liquid is filled in the cavity.

[0015] Optionally, the cavity includes multiple guide channels, which are evenly distributed within the film-forming area. Each guide channel is filled with the heat-conducting liquid, and the abrasive groove is provided corresponding to the guide channel.

[0016] The above-described technical solution of the present invention has the following beneficial effects: The method for preparing composite abrasive belts provided by this invention involves setting a cavity inside a mold at a position corresponding to the film-forming area, and filling the cavity with a heat-conducting liquid. During the coating process of the abrasive layer, the hydraulic pressure of the heat-conducting liquid is controlled to keep the surface of the mold corresponding to the film-forming area flat. When the abrasive layer is demolded from the mold, the hydraulic pressure of the heat-conducting liquid is controlled to cause elastic deformation of the surface of the mold corresponding to the film-forming area. The abrasive layer can be quickly demolded from the mold under the strain of the mold, so that the abrasive layer is tightly bonded to the abrasive belt substrate, thereby solving the problem of difficult demolding of abrasive grains and realizing the continuous production of composite abrasive belts. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a mold provided in one embodiment of the present invention; Figure 2 A schematic diagram of the structure of a mold provided in another embodiment of the present invention; Figure 3 This is a schematic diagram of the flow channel of the mold provided in an embodiment of the present invention; Figure 4 A flowchart illustrating the preparation method of the composite abrasive belt provided in an embodiment of the present invention; Figures 5 to 7 A schematic diagram illustrating the preparation process of the composite abrasive belt provided in an embodiment of the present invention; Figure 8 A cross-sectional schematic diagram of the composite abrasive belt provided in an embodiment of the present invention; Figure 9 This is a planar schematic diagram of the composite abrasive belt provided in an embodiment of the present invention.

[0019] Figure label: 1. Mold; 2. Abrasive layer; 3. Abrasive belt substrate; 4. Grinding unit; 5. Abrasive grains; 6. Adhesive; 100. Film-forming zone; 101. Mold body; 102. Abrasive groove; 103. Cavity; 104. Guide groove. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0021] With the increasing demands for grinding quality in precision machining, composite abrasive belts have attracted attention due to their high-efficiency grinding characteristics. Traditional abrasive belt manufacturing processes suffer from difficulties in abrasive grain demolding and cumbersome procedures. In particular, when using a pre-granulation followed by molding method, abrasive grains tend to stick to the mold, resulting in incomplete demolding and affecting the consistency of abrasive grain arrangement on the belt surface. Although existing fixed-configuration abrasive belts can achieve regular arrangement, they rely on a pre-molding followed by granulation process, which limits the feasibility of automated production.

[0022] Based on this, the present invention proposes a method for preparing composite abrasive belts to solve the problem of difficult demolding of abrasive particles, thereby realizing the continuous production of composite abrasive belts.

[0023] Please see Figure 1 and Figure 2 The present invention provides a mold for preparing composite abrasive belts with controllable abrasive grain morphology and arrangement rules, including a mold body 101 and a heat-conducting liquid (not shown). A film-forming area 100 is provided on one side surface of the mold body 101, and a plurality of abrasive grain grooves 102 arranged in a preset arrangement rule are provided in the film-forming area 100. A cavity 103 is provided inside the mold 1 at the position corresponding to the film-forming area 100, and the heat-conducting liquid is filled in the cavity 103.

[0024] The film-forming area 100 refers to the area on the surface of the mold 1 used to form the abrasive layer. It can be achieved by machining a groove structure of a preset depth on the surface, or by using other methods to constrain the film-forming range of the abrasive layer without surface machining. The abrasive groove 102 refers to the groove structure within the film-forming area 100 used to accommodate a single composite abrasive grain (i.e., a single grinding unit). Specifically, it can be formed by laser engraving or chemical etching. The structural form of the abrasive groove 102 is consistent with the structural form of the grinding unit on the pre-made composite abrasive belt, and the arrangement rule of the abrasive groove 102 is consistent with the preset arrangement rule of the grinding unit on the pre-made composite abrasive belt. By restricting the displacement of the abrasive grains within the abrasive groove 102, the consistency of the abrasive grain arrangement on the belt surface is ensured.

[0025] The cavity 103 refers to the sealed space inside the mold 1 corresponding to the film-forming area 100. Specifically, it can be achieved by opening a through channel structure inside the mold body 101. The cavity 103 is filled with heat-conducting liquid. By controlling the hydraulic pressure of the heat-conducting liquid, the surface of the film-forming area 100 corresponding to the mold 1 can be driven to undergo elastic deformation.

[0026] It should be noted that, in order to facilitate the illustration of the structure of the cavity 103 in the accompanying drawings of the present invention, the cavity 103 is shown from the perspective of a partial cross-section of the mold. In actual use, in order to ensure the sealing of the cavity 103, the cavity 103 is a sealed cavity provided corresponding to the film forming area 100, and each cavity 103 is sealed by a sealing cap or other sealing structure.

[0027] In one embodiment, the cavity 103 can be a U-shaped groove, such as... Figure 1 As shown; in another embodiment, the cavity 103 can be a rectangular groove, such as... Figure 2 As shown; but not limited to this.

[0028] Among them, the heat transfer fluid is a liquid with thermal conductivity, such as heat transfer oil, aqueous solution or liquid metal.

[0029] Specifically, during the preparation process, the mixed abrasive is filled into the film-forming region 100. By controlling the hydraulic pressure of the heat-conducting fluid, the surface of the mold 1 corresponding to the film-forming region 100 can be driven to undergo elastic deformation. When the hydraulic pressure is lower than a preset threshold, the pressure inside the cavity 103 is low, and the surface of the mold 1 maintains a rigid structure, that is, the surface of the mold 1 corresponding to the film-forming region 100 remains flat, ensuring accurate embedding of abrasive grains and stable formation of the abrasive layer. When the hydraulic pressure rises to exceed the preset threshold, the pressure inside the cavity 103 will push the surface of the mold 1 corresponding to the film-forming region 100 to undergo elastic deformation, reducing the contact area between the surface of the mold 1 and the abrasive layer, and causing the abrasive layer to separate from the mold 1.

[0030] The preset threshold is the critical pressure value (i.e., the buckling critical stress) that enables the surface of the film-forming region 100 of the mold 1 to undergo elastic deformation.

[0031] It is understood that the cavity 103 is positioned close to the side surface with the abrasive groove 102, resulting in a thin-walled structure on the side surface of the mold 1 with the abrasive groove 102. The side surface of the mold 1 with the abrasive groove 102 is designated as the upper surface, and the side surface of the mold 1 facing away from the abrasive groove 102 is designated as the lower surface. The cavity 103 is positioned close to the upper surface of the mold 1. In the thickness direction of the mold 1, the distance between the cavity 103 and the lower surface of the mold 1 is greater than the distance between the cavity 103 and the upper surface of the mold 1, thus forming a thin-walled structure capable of elastic deformation in the portion of the mold 1 above the cavity 103.

[0032] Mold 1 is made of a material with thermal conductivity, such as iron, copper, silver or alloy metals, but is not limited to this.

[0033] This invention achieves adaptive deformation of the mold surface by controlling the hydraulic pressure of the heat-conducting fluid, so that no external mechanical force is required during the demolding process, reducing the risk of damage to the abrasive structure and solving the problem of difficult demolding of abrasive particles, thereby realizing the continuous production of composite abrasive belts.

[0034] Furthermore, such as Figure 3 As shown, the cavity 103 includes multiple guide channels 104, or the cavity 103 is formed by multiple guide channels 104. These guide channels 104 are evenly distributed within the film-forming area 100, and each guide channel 104 is filled with a heat-conducting liquid. The abrasive grooves 102 are positioned corresponding to the guide channels 104, allowing the deformation force on the surface of the mold 1 to directly act on the area where the abrasive groove 102 is located, effectively reducing demolding resistance. The multiple guide channels 104 ensure a more uniform distribution of the heat-conducting liquid, preventing localized deformation that could lead to demolding failure. Simultaneously, they allow the heat from the heat-conducting liquid to be quickly transferred to each abrasive groove 102 area through the multiple guide channels 104, eliminating the impact of uneven temperature distribution on the shaping effect of the abrasive layer.

[0035] The mold provided by this invention for preparing composite abrasive belts solves the problem of difficult demolding caused by abrasive grain adhesion during the preparation process, achieving non-destructive separation of the abrasive layer from the mold. Simultaneously, the mold structure ensures the controllability of the abrasive grain morphology and arrangement, avoiding the impact of inconsistent grinding unit shapes on grinding stability, thereby improving the processing quality and service life of the abrasive belt product.

[0036] Please see Figures 4-7 The present invention also provides a method for preparing composite abrasive belts, which uses the above-mentioned mold and includes the following steps: Step 1: Mix the abrasive grains with the adhesive and let it stand to obtain the mixed abrasive.

[0037] Specifically, the mixed abrasive is made by mixing abrasive grains and adhesive in a weight ratio of 1:3. This ratio ensures that the adhesive can fully coat the abrasive grains to form a stable composite structure, while avoiding excessive adhesive that could cause the abrasive grains to stick to the mold surface during demolding.

[0038] The adhesive is made by mixing polyurethane emulsion and phenolic resin in a weight ratio of 1:20. This ratio utilizes the high bonding strength of phenolic resin to ensure the structural stability of the grinding unit and maintain the shape consistency of the grinding unit, while the flexibility of a small amount of polyurethane emulsion improves the release performance of the adhesive system.

[0039] Step 2, as follows Figure 1 and Figure 5 As shown, a mold 1 is provided. A film-forming area 100 is provided on one side surface of the mold 1. A plurality of abrasive grooves 102 arranged in a preset arrangement rule are provided in the film-forming area 100. A cavity 103 is provided inside the mold 1 at the position corresponding to the film-forming area 100. The cavity 103 is filled with a heat-conducting liquid. The mixed abrasive is coated onto the film-forming area 100 to form an abrasive layer 2.

[0040] Specifically, the step of coating the mixed abrasive onto the film-forming area 100 includes: The mixed abrasive is coated onto the film-forming area 100 by scraping, so that the abrasive groove 102 is filled with the mixed abrasive, and then scraped flat to form an abrasive layer 2 of a preset thickness.

[0041] Among them, the scraping method refers to the coating process in which the mixed abrasive is evenly spread on the film-forming area 100 by scraping or scraping blade. Specifically, it can be achieved by using a scraper device with an adjustable gap. The thickness of the abrasive layer 2 can be adjusted by controlling the gap between the scraper and the mold surface.

[0042] In one embodiment, before applying the mixed abrasive to the film-forming region 100, the method further includes the step of spraying a release agent onto the film-forming region 100.

[0043] The release agent can be silicone oil emulsion or polyvinyl alcohol solution, etc., and there are no restrictions here.

[0044] Specifically, the release agent is evenly applied to the inner wall of the abrasive tank 102 and the surface of the film-forming zone 100 using an atomizing spraying device, forming a continuous protective film. When the mixed abrasive is applied to the film-forming zone 100, the release agent isolates the adhesive from direct contact with the mold surface, effectively reducing the adhesion strength between the cured abrasive layer 2 and the mold 1. When the surface of the mold 1 undergoes elastic deformation, the lubricating effect of the release agent reduces the sliding resistance at the contact surface between the abrasive layer 2 and the mold 1, allowing the abrasive layer 2 to detach completely from the mold 1 without structural tearing.

[0045] Furthermore, after the mixed abrasive is coated onto the film-forming area 100, the following steps are also included: Heat the heat-conducting fluid and maintain it at 60 ℃, then heat the abrasive layer 2 for 1 minute to initially shape the abrasive layer 2.

[0046] Specifically, after the mixed abrasive is coated onto the film-forming area 100, the heat-conducting liquid inside the mold 1 is heated to 60°C and maintained for 1 minute. The heat is conducted through the mold body to the surface of the film-forming area 100, causing partial cross-linking of the polymer chains in the adhesive, thus achieving pre-curing. This ensures that the abrasive layer 2 maintains its preset geometry when transferred to the abrasive belt substrate 3, while also preventing a decrease in interfacial bonding due to over-curing.

[0047] Step 3: Control the hydraulic pressure of the heat transfer fluid to be less than or equal to a preset threshold so that the surface of the mold 1 corresponding to the film-forming area 100 remains flat.

[0048] The preset threshold is the critical pressure value that causes elastic deformation of the surface of the film-forming area 100 corresponding to the mold 1.

[0049] When the hydraulic pressure is less than or equal to a preset threshold, the pressure inside the cavity 103 is low, and the surface of the mold 1 maintains a rigid structure, that is, the surface of the mold 1 corresponding to the film-forming area 100 remains flat to ensure the stable formation of the abrasive layer 2.

[0050] Step 4: Apply primer to the surface of the abrasive belt substrate 3.

[0051] The base adhesive is preferably a phenolic resin adhesive, which provides adhesion for the bonding of the abrasive layer 2 and the abrasive belt substrate 3.

[0052] Specifically, the surface of the abrasive belt substrate 3 is first cleaned, and then a layer of phenolic resin adhesive is evenly coated on it.

[0053] Step 5, as follows Figure 6 and Figure 7 As shown, the mold 1 is pressed onto the abrasive belt substrate 3 with the abrasive layer 2 facing the abrasive belt substrate 3. At the same time, the heat-conducting liquid is pressurized to a pressure greater than a preset threshold, causing the surface of the mold 1 corresponding to the film-forming area 100 to undergo elastic deformation, so that the abrasive layer 2 is demolded from the mold 1 and the abrasive layer 2 is tightly bonded to the abrasive belt substrate 3, thus producing a composite abrasive belt.

[0054] When the hydraulic pressure rises to a level exceeding a preset threshold, the pressure inside the cavity 103 will cause the surface of the mold 1 corresponding to the film-forming area 100 to undergo elastic deformation, reducing the contact area between the surface of the mold 1 and the abrasive layer 2, and causing the abrasive layer 2 to separate from the mold 1.

[0055] The process of preparing the composite abrasive belt further includes the following steps: The composite abrasive belt was dried at 70°C for 20 minutes and then dehumidified. The composite abrasive belt was dried again at 90℃ for 40 minutes to complete the shaping process.

[0056] Specifically, during initial drying at 70℃, free moisture in the adhesive is rapidly expelled through dehumidification, preventing moisture retention and the formation of internal pores. At this stage, the adhesive molecular chains begin to cross-link but are not fully hardened, forming a preliminary bonding interface between the abrasive grains and the substrate. When the temperature rises to 90℃, the active groups in the adhesive react more rapidly at high temperatures, promoting the formation of a three-dimensional network structure in the polymer chains, thus stabilizing the interfacial bonding strength between the abrasive grains and the substrate. Through the synergistic effect of staged temperature and humidity control, the curing rate of the abrasive layer from the surface to the interior tends to be uniform, avoiding the problems of excessively rapid surface hardening and internal stress concentration caused by single-stage high-temperature drying.

[0057] The above method effectively solves the problem of loose structure caused by improper temperature and humidity control during the drying process of abrasive layer. By controlling the temperature in stages, the cross-linking reaction of the adhesive is ensured to proceed fully. At the same time, the dehumidification treatment eliminates the negative impact of residual moisture on the interfacial bonding strength, and finally a composite abrasive belt with uniform and dense structure and stable bonding strength is obtained.

[0058] Please see Figure 8 and Figure 9 The present invention also provides a composite abrasive belt, which is manufactured by the above-described method for preparing composite abrasive belts. The composite abrasive belt includes a belt substrate 3 and an abrasive layer 2 disposed on the surface of the belt substrate 3. The abrasive layer 2 includes abrasive grains 5 and an adhesive 6. Grinding units 4 protruding along the surface of the belt substrate 3 are provided on the surface of the abrasive layer 2, and gaps are provided between adjacent grinding units 4.

[0059] Among them, grinding unit 4 refers to a regularly arranged structure formed by a mold. Specifically, the shape can be controlled by the abrasive grooves preset on the surface of the mold, so that the external dimensions and distribution position of each grinding unit 4 are consistent. The gap design between adjacent grinding units 4 allows chips to be discharged through the gaps during the grinding process, reducing the risk of clogging.

[0060] Each grinding unit 4 contains numerous abrasive grains 5, achieving typical multi-layer grinding. During the grinding process, the cutting edges of multiple abrasive grains 5 work together to provide a stable grinding force. When the uppermost abrasive grain 5 becomes dull and fails due to grinding, the dulled abrasive grain 5 falls off due to increased grinding resistance and loss of adhesive 6. At this time, new abrasive grains 5 in the middle and lower layers are exposed and participate in grinding, thereby significantly improving grinding efficiency and effectively improving the surface quality of the workpiece. It has the significant characteristics of high-efficiency and high-quality grinding.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing a composite abrasive belt, characterized in that, Includes the following steps: Abrasive grains are mixed with adhesive and allowed to stand to obtain a mixed abrasive. A mold is provided, with a film-forming area on one side surface. The film-forming area has a plurality of abrasive grooves arranged in a preset pattern. The mold has a cavity corresponding to the position of the film-forming area, and the cavity is filled with a heat-conducting liquid. The mixed abrasive is coated onto the film-forming area to form an abrasive layer. The hydraulic pressure of the heat-conducting fluid is controlled to be less than or equal to a preset threshold so that the surface of the mold corresponding to the film-forming area remains flat; Apply a primer to the surface of the abrasive belt substrate; The mold is pressed onto the abrasive belt substrate with the abrasive layer facing the substrate, and the heat-conducting liquid is pressurized to a pressure greater than the preset threshold, causing the surface of the mold corresponding to the film-forming area to undergo elastic deformation, so that the abrasive layer is demolded from the mold and tightly adhered to the abrasive belt substrate, thereby producing a composite abrasive belt.

2. The method for preparing composite abrasive belts according to claim 1, characterized in that, The preset threshold is a critical pressure value that causes elastic deformation of the surface of the mold corresponding to the film-forming area.

3. The method for preparing composite abrasive belts according to claim 1, characterized in that, The step of coating the mixed abrasive onto the film-forming region includes: The mixed abrasive is applied to the film-forming area by scraping, so that the abrasive groove is filled with the mixed abrasive, and then scraped flat to form an abrasive layer of a preset thickness.

4. The method for preparing composite abrasive belts according to claim 1, characterized in that, Before coating the mixed abrasive onto the film-forming area, the method further includes the following steps: A release agent is sprayed onto the film-forming area.

5. The method for preparing composite abrasive belts according to claim 1, characterized in that, After the mixed abrasive is coated onto the film-forming area and before the primer is applied to the surface of the abrasive belt substrate, the following steps are also included: The heat-conducting fluid is heated and maintained at 60 °C, and the abrasive layer is heated for 1 minute to initially shape the abrasive layer.

6. The method for preparing composite abrasive belts according to claim 1, characterized in that, After obtaining the composite abrasive belt, the following steps are also included: The composite abrasive belt was dried at 70°C for 20 minutes and then dehumidified. The composite abrasive belt is dried again at 90°C for 40 minutes to complete the shaping process.

7. The method for preparing composite abrasive belts according to claim 1, characterized in that, The mixed abrasive is made by mixing the abrasive grains and the adhesive in a 1:3 ratio, and the adhesive is made by mixing polyurethane emulsion and phenolic resin in a 1:20 ratio.

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