Flexible grinding disc and forming method thereof

Abstract

The invention discloses a flexible grinding disc and a forming method thereof, and relates to the technical field of grinding products, the flexible grinding disc comprises a composite grinding material layer and a base material layer, the base material layer is a glass fiber base plate, grinding pellets are formed on the base material layer in a casting mode around the circumference, the composite grinding material layer is formed by the grinding pellets, and the composite grinding material layer is formed by the grinding pellets. The grinding pellet is composed of a composite grinding material, a binding agent and a diluent, the composite grinding material comprises a diamond main grinding material and a SiC auxiliary grinding material, and the forming method comprises the steps that S1, slurry is prepared; s2, assembling the mold; s3, molding by casting; s4, unloading the mold; s5, curing is conducted; according to the scheme, the flexible grinding disc with the pellets with the thickness being 1-2 mm and the diameter being 2-10 mm is formed in the self-made steel mold through a pouring method, surface grinding treatment can be conducted on the fragile glass products, different grinding requirements of different users can be met, the problems of surface scratches and scratches can be well solved, meanwhile, environmental pollution can be effectively reduced, and the service life of the fragile glass products is prolonged. Meanwhile, the machining and forming efficiency is high.

Description

Technical Field

[0001] The invention relates to the technical field of grinding tools, and in particular to a flexible grinding disc and a molding method thereof. Background Art

[0002] In the field of abrasive product technology, especially for the surface treatment of brittle materials such as glass products, traditional grinding discs often have many shortcomings.

[0003] Traditionally, the thinning of brittle and hard materials generally adopts the free abrasive grinding method. Although this process has high grinding efficiency, it produces a lot of free abrasive waste, which causes great pollution to the environment. Secondly, the free abrasive will also scratch the workpiece. At present, the industry is in urgent need of a new process that can replace free grinding. With the promotion of the double-end grinding process of resin, ceramic, metal and other binders consolidating superhard material grinding discs in recent years, this high-efficiency and high-quality processing method is beginning to become popular in the field of hard and brittle material processing, but it has not been able to effectively solve the problem of scratches and scratches on the surface of brittle glass during use. In addition, during the processing of traditional rigid grinding discs, due to their high hardness and lack of sufficient flexibility, they are prone to produce large contact pressure during the grinding process, resulting in scratches and scratches on the surface of brittle materials, which seriously affects product quality. In addition, rigid grinding discs also produce a lot of dust and debris during the processing process, which causes certain pollution to the environment. In order to overcome these shortcomings, flexible grinding discs have gradually received attention in recent years. Flexible grinding disc is an efficient grinding tool used for precision grinding of workpieces. It is used for surface grinding of brittle glass products to meet the different grinding needs of different users. It can effectively solve the problem of surface scratches and marks, and can effectively reduce environmental pollution. The traditional grinding disc forming method is generally press forming. The grinding disc formed by this method has a small diameter. The grinding disc has a steel base, which makes it heavy and inconvenient to operate, and the grinding efficiency is relatively low. However, the existing flexible grinding disc still has some shortcomings in preparation process and performance, such as low forming efficiency and unstable grinding effect. Therefore, a new forming solution with high efficiency, high quality and mass production is urgently needed. Summary of the invention

[0004] In order to solve the above problems, the present invention proposes a novel flexible grinding disc and a forming method thereof. The flexible grinding disc adopts a glass fiber substrate as a substrate layer, and forms a grinding pill on the substrate layer around the circumference by casting. The grinding pill is composed of a composite abrasive, a binder and a diluent, wherein the composite abrasive includes a diamond main abrasive and a SiC auxiliary abrasive. This combination can significantly improve the grinding efficiency and grinding quality. The forming method of the present invention includes the steps of slurry preparation, mold assembly, casting molding, mold removal and curing. By accurately controlling the slurry ratio and casting process, grinding pills with a specific thickness and diameter can be quickly formed in a homemade steel mold. This forming method not only improves the processing efficiency, but also ensures the uniformity and consistency of the grinding pills, thereby improving the overall performance of the flexible grinding disc. In summary, the flexible grinding disc and the forming method thereof of the present invention are intended to solve the problems of scratches, scratches and environmental pollution existing in traditional rigid grinding discs when processing brittle materials, while improving the processing efficiency and grinding quality. By optimizing the preparation process and performance of the grinding disc, the present invention provides a more efficient, environmentally friendly and reliable solution for the field of grinding product technology.

[0005] The present invention is achieved through the following technical solutions:

[0006] A flexible grinding disc comprises a substrate layer, wherein the substrate layer is a glass fiber substrate, and grinding pellets are cast around the circumference of the substrate layer. The grinding pellets are composed of composite abrasives, a binder, and a diluent. The composite abrasives include a diamond main abrasive and a SiC auxiliary abrasive.

[0007] In order to further optimize the present invention, the following technical solutions may be preferably used:

[0008] Preferably, the grinding pellets have a thickness of 1-2 mm and a diameter of 2-10 mm.

[0009] Preferably, the binder is a uniform binder system, consisting of phenolic resin liquid, epoxy resin liquid and amine curing agent, and the diluent is analytical pure anhydrous ethanol.

[0010] Preferably, the main diamond abrasive has a diameter of 15 microns.

[0011] Preferably, by mass, diamond accounts for 35%, binder accounts for 45%, and other auxiliary materials account for 20%.

[0012] A method for forming a flexible grinding disc comprises the following steps:

[0013] S1: Preparation of slurry:

[0014] According to the grinding requirements, the mass ratio of each raw material is set as follows: 35% diamond, 45% binder, 20% auxiliary material, and the diameter of the diamond abrasive is 15 microns;

[0015] Weigh corresponding amounts of diamond and auxiliary materials according to the ratio, put them into a mixing tank, and use a three-dimensional mixer to mix the mixture for 3 hours to make the mixture uniform, so as to obtain a solid mixture A;

[0016] According to the formula ratio, phenolic resin liquid, epoxy resin liquid and curing agent are weighed and put into a material basin respectively, and the heating and stirring device is set to a heating temperature of 30-40°C and a stirring speed of 80-100r / min. The stirrer switch is turned on and heating and stirring are started for 10 minutes to obtain a uniform binder system, and then 30% of analytical pure anhydrous ethanol as a diluent is added, and stirring is continued until the color is uniform to obtain a liquid binder B for standby use;

[0017] Pour the mixed solid mixture A into the mixed liquid binder B, and continue stirring for 20 minutes until the mixture is evenly mixed to obtain a mixed slurry;

[0018] S2: Mold assembly:

[0019] Take a Φ510 steel base plate and place it on the rotating operating table; then select a glass fiber substrate with a size of Φ500×4×Φ110mm, clean and blow dry, and then place it on the Φ510 steel base plate; clean the tapered hole mold with a size of Φ500×4×Φ110mm, clean it with anhydrous ethanol, blow dry it with an air gun and spray it with a release agent, and then place it on the glass fiber substrate, put the three-petal mold on the tapered hole mold, and finally put the mold frame on the three-petal mold and tighten it to complete the mold assembly, and place multiple sets of molds and substrates assembled with base plates on a conveyor belt for standby use, so as to achieve continuous feeding, and multiple flexible grinding discs can be formed at one time;

[0020] S3: Casting:

[0021] Fix the quantitative feeding device with the feeding port just above the assembled mold and the substrate, inject the mixed slurry into the quantitative feeding device, adjust the position of the feeding port of the quantitative feeding device to ensure that each feeding port is just above the silo, turn on the switch of the quantitative feeding device, start feeding the silo, set the quantitative feeding device to stay above each group of silos for 10 seconds (enough to ensure that each silo is filled with slurry), after the silo is full, rotate the small operating table once to start feeding the next batch of silos, and so on, until all silos in the cone hole mold are fully filled with slurry and then stop feeding, scrape off the excess slurry with a scraper after the slurry is self-leveling, and ensure the flatness of the surface of the pills, the molding and pouring are completed, and then transported to the waiting area for curing, and left to stand in the waiting area for 72 hours;

[0022] S4: Mold removal:

[0023] After pouring is completed and left to stand for 72 hours, put the demoulding tool on the press, then put the mold and the base on the tool, so that the lower part of the mold frame is in full contact with the tool, and then put another demoulding tool on the three-petal mold, set the pressure of the press, start the press, first press down the three-petal mold, pull out the mold sleeve, take out the three-petal mold, and finally remove the steel mold to complete the demoulding;

[0024] S5: Curing:

[0025] After removing the steel mold, place it at room temperature for 12-24 hours, put it into an oven and cure it at 150°C for 12 hours to obtain a flexible grinding disc.

[0026] Preferably, the mold used in step S2 is a steel mold, including a tapered hole mold, a three-petal mold, and a mold frame; the three-petal mold and the mold frame are both taper, and the hole on the tapered hole mold has a taper of 60°, a height of the tapered hole of 1-2mm, and a diameter of 2-10mm.

[0027] The beneficial effects of the present invention are mainly reflected in the following aspects:

[0028] (1): Improve processing accuracy and surface quality: By adopting a composite abrasive system of diamond main abrasive and SiC auxiliary abrasive, the flexible grinding disc of the present invention can significantly reduce the generation of surface scratches and marks when processing brittle materials such as glass products. The high hardness and wear resistance of the diamond main abrasive ensure efficient grinding ability, while the SiC auxiliary abrasive helps to refine the grinding process and improve the surface finish.

[0029] (2): Enhanced flexibility and adaptability: The base material layer uses a glass fiber substrate, which gives the grinding disc good flexibility and adaptability. This allows the grinding disc to better fit the workpiece surface during processing, especially when processing complex shapes or curved surfaces, to maintain a stable contact pressure and avoid damage caused by local overpressure.

[0030] (3) Optimize the size of grinding pellets: The thickness of the grinding pellets is controlled within the range of 1-2 mm and the diameter is within the range of 2-10 mm. This design not only ensures sufficient grinding force, but also avoids the problem of uneven processing caused by oversize. At the same time, reasonable size design also helps to improve the durability and service life of the grinding disc.

[0031] (4) Improve the performance of the binder: The use of a uniform binder system consisting of phenolic resin liquid, epoxy resin liquid and amine curing agent not only improves the strength and stability of the grinding pellets, but also ensures a firm bond between the abrasive and the substrate layer. In addition, the use of analytical pure anhydrous ethanol as a diluent helps to improve the fluidity and uniformity of the slurry, further improving the molding quality.

[0032] (5) Optimize the abrasive ratio: By mass, the ratio of diamond to binder is 35%, and other auxiliary materials is 45%. After careful design and experimental verification, it can give full play to the grinding efficiency of the main diamond abrasive and the refinement effect of the SiC auxiliary abrasive, while ensuring the overall performance and stability of the slurry. This ratio helps to achieve an efficient and low-loss grinding process.

[0033] (6) Environmental protection and high efficiency: The flexible grinding disc of the present invention generates less dust and debris during processing, which helps to reduce environmental pollution. At the same time, its high processing efficiency and good surface quality also reduce the workload of subsequent processing and improve the overall production efficiency. In summary, the flexible grinding disc of the present invention achieves efficient and high-precision processing of brittle materials by optimizing the size of the grinding pellets, the performance of the binder, the ratio of the abrasive, etc., and at the same time has good environmental protection and durability, and has significant beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the overall structure of the flexible grinding disc;.

[0035] Among them: 1-substrate layer; 2-grinding pills. DETAILED DESCRIPTION

[0036] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] The following will be combined with the drawings in the embodiments of the invention to clearly and completely describe the technical solutions in the embodiments of the invention. Obviously, the described embodiments are only part of the embodiments of the invention, not all of the embodiments. Based on the embodiments of the invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the invention.

[0038] like Figure 1 A flexible grinding disc comprises a substrate layer, wherein the substrate layer 1 is a glass fiber substrate, and a grinding pellet 2 is cast around the circumference of the substrate layer. The grinding pellet is composed of a composite abrasive, a binder, and a diluent. The composite abrasive comprises a diamond main abrasive and a SiC auxiliary abrasive.

[0039] The thickness of the grinding pellets is 1-2 mm and the diameter is 2-10 mm.

[0040] The binder is a uniform binder system consisting of phenolic resin liquid, epoxy resin liquid and amine curing agent, and the diluent is analytical pure anhydrous ethanol.

[0041] The main diamond abrasive has a diameter of 15 microns.

[0042] Calculated by mass, diamond accounts for 35%, binder accounts for 45%, and other auxiliary materials account for 20%.

[0043] Embodiment 1:

[0044] The forming process of a circular flexible grinding disc with dimensions of Φ200×4×Φ32mm.

[0045] (1) Preparation:

[0046] Clean the work surface, clean the quantitative feeding device and blow it dry, prepare the material basin, brush, glass rod, material spoon, scraper, blade, heating stirrer, etc.

[0047] (2) Preparation of slurry:

[0048] According to the grinding requirements, the mass ratio of each raw material is set as: diamond 35%, binder 45%, auxiliary material 20%, and the diameter of the diamond abrasive is 15 microns.

[0049] Weigh the corresponding amount of diamond and auxiliary materials according to the ratio, put them into the mixing tank, and use a three-dimensional mixer to mix for 3 hours to make the mixture evenly mixed.

[0050] According to the formula ratio, weigh the phenolic resin liquid, epoxy resin liquid and curing agent respectively and put them into the material basin, set the heating temperature of the heating and stirring device to 30-40℃ and the stirring speed to 80-100r / min, turn on the stirrer switch and start heating and stirring for 10 minutes to obtain a uniform binder system, then add 30% of analytical pure anhydrous ethanol as a diluent, continue stirring until the color is uniform and set aside.

[0051] Pour the mixed mixture into the mixed liquid binder and continue stirring for 20 minutes until the mixture is evenly mixed to obtain a mixed slurry.

[0052] (3) Mold assembly:

[0053] Take a Φ210 steel base plate and place it on the rotating operating table; then select a glass fiber substrate with the size of Φ200×4×Φ32mm, clean and blow dry, and then place it on the Φ210 steel base plate; clean the cone hole mold with the size of Φ200×4×Φ32mm, clean it with anhydrous ethanol, blow dry it with an air gun and spray it with a release agent, then place it on the glass fiber substrate, put the three-petal mold on the cone hole mold, and finally put the mold frame on the three-petal mold and tighten it to complete the mold assembly. Put multiple sets of molds and substrates assembled with base plates on the conveyor belt for standby, so as to realize continuous feeding and form multiple flexible grinding discs at one time.

[0054] (4) Casting:

[0055] Fix the quantitative feeding device with the feeding port just above the assembled mold and substrate, inject the mixed slurry into the quantitative feeding device, adjust the position of the feeding port of the feeding device to ensure that each feeding port is just above the silo, set the quantitative feeding device to stay above each group of silos for 10 seconds (enough to ensure that each silo is filled with slurry), turn on the quantitative feeding device switch, start feeding the silo, and after the silo is full, rotate the small operating table once to start feeding the next batch of silos, and so on, until all the silos in the tapered hole mold are filled with slurry and then stop feeding. After the slurry is self-leveling, use a scraper to scrape off excess slurry, while ensuring the flatness of the surface of the pill. The molding and pouring are completed, and then transported to the waiting area for curing. Let it stand in the waiting area for 72 hours to obtain a grinding disc with pills with a thickness of 1-2mm and a diameter of 2-10mm.

[0056] (5) Mold unloading:

[0057] After the pouring is completed and left to stand for 72 hours, put the demolding tool on the press, then put the mold and the base on the tool so that the lower part of the mold frame is in full contact with the tool, and then put another demolding tool on the three-petal mold, set the pressure of the press, start the press, first press down the three-petal mold, pull out the mold sleeve, take out the three-petal mold, and finally remove the steel mold to complete the demolding.

[0058] (6) Curing:

[0059] After removing the steel mold, place it at room temperature for 12-24 hours, and then put it into an oven for curing at 150°C for 12 hours to obtain a flexible grinding disc.

[0060] Embodiment 2:

[0061] The forming process of a circular flexible grinding disc with dimensions of Φ500×4×Φ110 mm.

[0062] (1) Preparation:

[0063] Clean the work surface, clean the quantitative feeding device and blow it dry, prepare the material basin, brush, glass rod, material spoon, scraper, blade, heating stirrer, etc.

[0064] (2) Preparation of slurry:

[0065] According to the grinding requirements, the mass ratio of each raw material is set as: diamond 35%, binder 45%, auxiliary material 20%, and the diameter of the diamond abrasive is 15 microns.

[0066] Weigh the corresponding amount of diamond and auxiliary materials according to the ratio, put them into the mixing tank, and use a three-dimensional mixer to mix for 3 hours to make the mixture evenly mixed.

[0067] According to the formula ratio, weigh the phenolic resin liquid, epoxy resin liquid and curing agent respectively and put them into the material basin, set the heating temperature of the heating and stirring device to 30-40℃ and the stirring speed to 80-100r / min, turn on the stirrer switch and start heating and stirring for 10 minutes to obtain a uniform binder system, then add 30% of analytical pure anhydrous ethanol as a diluent, continue stirring until the color is uniform and set aside.

[0068] Pour the mixed mixture into the mixed liquid binder and continue stirring for 20 minutes until the mixture is evenly mixed to obtain a mixed slurry.

[0069] (3) Mold assembly:

[0070] Take a Φ510 steel base plate and place it on the rotating operating table; then select a glass fiber substrate with the size of Φ500×4×Φ110mm, clean and blow dry, and then place it on the Φ510 steel base plate; clean the cone hole mold with the size of Φ500×4×Φ110mm, clean it with anhydrous ethanol, blow dry it with an air gun and spray it with a release agent, then place it on the glass fiber substrate, put the three-petal mold on the cone hole mold, and finally put the mold frame on the three-petal mold and tighten it to complete the mold assembly. Put multiple sets of molds and substrates assembled with base plates on the conveyor belt for standby use to achieve continuous feeding, and multiple flexible grinding discs can be formed at one time.

[0071] (4) Casting:

[0072] Fix the quantitative feeding device with the feeding port just above the assembled mold and substrate, inject the mixed slurry into the quantitative feeding device, adjust the position of the feeding port of the feeding device to ensure that each feeding port is just above the silo, turn on the quantitative feeding device switch, start feeding the silo, set the quantitative feeding device to stay above each group of silos for 10 seconds (enough to ensure that each silo is filled with slurry), and after the silo is full, rotate the small operating table once to start feeding the next batch of silos, and so on, until all the silos in the tapered hole mold are filled with slurry and then stop feeding. After the slurry is self-leveling, use a scraper to scrape off excess slurry, while ensuring the flatness of the surface of the pills. The molding and pouring are completed, and then transported to the area to be cured and left to stand in the area to be cured for 72 hours.

[0073] (5) Mold unloading:

[0074] After the pouring is completed and left to stand for 72 hours, put the demolding tool on the press, then put the mold and the base on the tool so that the lower part of the mold frame is in full contact with the tool, and then put another demolding tool on the three-petal mold, set the pressure of the press, start the press, first press down the three-petal mold, pull out the mold sleeve, take out the three-petal mold, and finally remove the steel mold to complete the demolding.

[0075] (6) Curing:

[0076] After removing the steel mold, place it at room temperature for 12-24 hours, put it into an oven and cure it at 150°C for 12 hours to obtain a flexible grinding disc.

[0077] In order to demonstrate the effects of the flexible grinding disc and the forming method thereof, the present invention designs a series of experiments to verify the performance, efficiency and environmental friendliness thereof.

[0078] 1. Grinding effect experiment

[0079] Purpose: To verify the effect of flexible grinding disc on the surface grinding of brittle glass products, including the ability to remove surface scratches and marks. The experimental steps are as follows:

[0080] ① Prepare some brittle glass substrates that need to be thinned and ground, with dimensions of 150×75×1mm.

[0081] ② On a double-end surface grinding machine (the present invention selects a DM580 grinder manufactured by Hunan Yuhuan CNC Machine Tool Co., Ltd.), the glass sample is ground using the flexible grinding disc of the present invention, and the surface conditions before and after grinding are recorded.

[0082] ③ Use a roughness meter to measure parameters such as surface roughness and scratch depth before and after grinding.

[0083] ④ Compare the samples before and after grinding to evaluate the grinding effect. The experiment shows that the roughness of the glass substrate workpiece after grinding is Ra0.672 microns.

[0084] 2. Processing efficiency experiment

[0085] Purpose: To verify the processing efficiency of flexible grinding discs.

[0086] Experimental steps:

[0087] ① Set uniform processing conditions (such as single cutting depth, rotation speed, grinding time, etc.). In this experiment, the single cutting depth of the glass substrate is 0.3mm, the grinding wheel speed is 700rpm, and the grinding time of a single workpiece is 9 seconds.

[0088] ② Use the flexible grinding disc of the present invention to grind a plurality of brittle glass samples, and record the time required to complete each sample. After the rotation speed of the workpiece turntable of the grinding machine is determined, the grinding time of each workpiece is 9 seconds.

[0089] ③Compare with the traditional grinding method to evaluate the improvement of processing efficiency. According to calculations, the grinding efficiency of the grinding disc for grinding glass substrates is 375mm3 / sec, which is 12.5 times higher than the conventional free silicon carbide abrasive grinding efficiency of 30mm3 / sec.

[0090] 3. Environmental protection experiment

[0091] Purpose: To verify the impact of flexible grinding discs on the environment during processing.

[0092] Experimental steps:

[0093] ① Grinding is carried out in a closed double-end surface grinding machine tool experimental environment. The glass residues and grinding fluid and other debris generated during the processing are collected in a constant temperature cooling water tank. The coolant is recycled after filtering with filter paper, and the glass residues can be recycled without causing pollution to the environment.

[0094] ② The collected pollutants were analyzed for their composition, and only very small amounts of diamond particles and glass shavings were found, which were assessed to have no adverse impact on the environment.

[0095] ③ In summary, compared with the traditional silicon carbide free abrasive grinding method that produces a large amount of silicon carbide and glass residue waste that cannot be recycled, the environmental friendliness of the present invention is outstanding.

[0096] 4. Durability test

[0097] Purpose: To verify the durability and service life of flexible grinding discs.

[0098] Experimental steps:

[0099] ① The flexible grinding disc is subjected to continuous grinding and its wear during use is recorded.

[0100] ②Regularly check the surface condition, grinding effect and other parameters of the grinding disc to evaluate its durability.

[0101] ③ According to the experimental results, the service life of the grinding disc of the present invention is to grind no less than 50,000 glass substrates, and the grinding cost is less than 0.1 yuan per glass substrate, which is better than the silicon carbide free abrasive grinding method, and the single piece grinding cost is reduced by about 30%.

[0102] 5. Bond strength test

[0103] Purpose: To verify the bonding strength between the abrasive pellets and the substrate layer.

[0104] Experimental steps:

[0105] ①Use a tensile testing machine and other equipment to perform a tensile test on the grinding disc, and measure the bonding strength between the grinding pellets and the substrate layer to be greater than 15MPa. Ensure that the bonding strength meets the design requirements to ensure that the grinding pellets will not fall off during the grinding process.

[0106] 6. Repeat the processing experiment

[0107] Purpose: To verify the stability and consistency of flexible grinding discs after repeated processing.

[0108] Experimental steps:

[0109] ① Repeated grinding of the same brittle glass sample was performed multiple times, and the surface state after each treatment was recorded. After measurement, the thickness tolerance of the batch glass substrate was less than 0.015mm, the parallelism was less than 0.01mm, the surface roughness value range of the workpiece was between Ra0.5-0.7 microns, and there were no visible scratches on the workpiece surface. After evaluation, the performance of the grinding disc did not change significantly after multiple processing, including the grinding effect, processing efficiency and other data are relatively stable.

[0110] The above grinding experiments prove that the flexible grinding disc prepared by the process of the present invention has good performance, and the workpiece grinding quality is stable and consistent, which provides data support for further improvement and optimization of grinding disc products.

[0111] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A flexible grinding disc, characterized in that: The invention comprises a substrate layer, which is a glass fiber substrate. A grinding pellet is cast around the circumference of the substrate layer. The grinding pellet consists of a composite abrasive, a binder and a diluent. The composite abrasive comprises a diamond main abrasive and a SiC auxiliary abrasive.

2. A flexible grinding disc according to claim 1, characterized in that: The grinding pills have a thickness of 1-2 mm and a diameter of 2-10 mm.

3. A flexible grinding disc according to claim 1, characterized in that: The binder is a uniform binder system, which is composed of phenolic resin liquid, epoxy resin liquid and amine curing agent, and the diluent is analytical pure anhydrous ethanol.

4. A flexible grinding disc according to claim 1, characterized in that: The diameter of the main diamond abrasive is 15 microns.

5. A flexible grinding disc according to claim 1, characterized in that: In terms of mass, diamond accounts for 35%, binder accounts for 45%, and other auxiliary materials account for 20%.

6. A method for forming a flexible grinding disc as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: S1: Preparation of slurry: According to the grinding requirements, the mass ratio of each raw material is set as follows: 35% diamond, 45% binder, 20% auxiliary material, and the diameter of the diamond abrasive is 15 microns; Weigh corresponding amounts of diamond and auxiliary materials according to the ratio, put them into a mixing tank, and use a three-dimensional mixer to mix the mixture for 3 hours to make the mixture uniform, so as to obtain a solid mixture A; According to the formula ratio, phenolic resin liquid, epoxy resin liquid and curing agent are weighed and put into a material basin respectively, and the heating and stirring device is set to a heating temperature of 30-40°C and a stirring speed of 80-100r / min. The stirrer switch is turned on and heating and stirring are started for 10 minutes to obtain a uniform binder system, and then 30% of analytical pure anhydrous ethanol as a diluent is added, and stirring is continued until the color is uniform to obtain a liquid binder B for standby use; Pour the mixed solid mixture A into the mixed liquid binder B, and continue stirring for 20 minutes until the mixture is evenly mixed to obtain a mixed slurry; S2: Mold assembly: Take a Φ510 steel base plate and place it on the rotating operating table; then select a glass fiber substrate with a size of Φ500×4×Φ110mm, clean and blow dry, and then place it on the Φ510 steel base plate; clean the tapered hole mold with a size of Φ500×4×Φ110mm, clean it with anhydrous ethanol, blow dry it with an air gun and spray it with a release agent, and then place it on the glass fiber substrate, put the three-petal mold on the tapered hole mold, and finally put the mold frame on the three-petal mold and tighten it to complete the mold assembly, and place multiple sets of molds and substrates assembled with base plates on a conveyor belt for standby use, so as to achieve continuous feeding, and multiple flexible grinding discs can be formed at one time; S3: Casting: Fix the quantitative feeding device with the feeding port just above the assembled mold and the substrate, inject the mixed slurry into the quantitative feeding device, adjust the position of the feeding port of the quantitative feeding device to ensure that each feeding port is just above the silo, turn on the switch of the quantitative feeding device, start feeding the silo, set the quantitative feeding device to stay above each group of silos for 10 seconds (enough to ensure that each silo is filled with slurry), after the silo is full, rotate the small operating table once to start feeding the next batch of silos, and so on, until all silos in the cone hole mold are fully filled with slurry and then stop feeding, scrape off the excess slurry with a scraper after the slurry is self-leveling, and ensure the flatness of the surface of the pills, the molding and pouring are completed, and then transported to the waiting area for curing, and left to stand in the waiting area for 72 hours; S4: Mold removal: After pouring is completed and left to stand for 72 hours, put the demoulding tool on the press, then put the mold and the base on the tool, so that the lower part of the mold frame is in full contact with the tool, and then put another demoulding tool on the three-petal mold, set the pressure of the press, start the press, first press down the three-petal mold, pull out the mold sleeve, take out the three-petal mold, and finally remove the steel mold to complete the demoulding; S5: Curing: After removing the steel mold, place it at room temperature for 12-24 hours, put it into an oven and cure it at 150°C for 12 hours to obtain a flexible grinding disc.

7. A method for forming a flexible grinding disc according to claim 6, characterized in that: The following steps are involved: The mold used in step S2 is a steel mold, including a tapered hole mold, a three-petal mold, and a mold frame; the three-petal mold and the mold frame are both taper, the hole on the tapered hole mold has a taper of 60°, the height of the tapered hole is 1-2mm, and the diameter is 2-10mm.

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