Nut for bolt fastening grinding wheel

Abstract

This utility model relates to the field of grinding tool technology, specifically a nut for bolting a grinding wheel. It includes a grinding wheel and a fastening nut, each comprising a hollow cylinder with internal threads and a nut. The fastening nut is embedded in the bottom of the grinding wheel, with its end face parallel to the bottom surface of the grinding wheel. The grinding wheel is fixed to a flange by auxiliary bolts. The flange has several positioning holes, through which the auxiliary bolts pass and through the grinding wheel, their ends locked in place by the fastening nut. The hollow cylinder and nut portions of this bolt-fastening nut can be formed using injection molding, compression molding, or 3D printing, offering flexible manufacturing processes. This enables high-precision, high-volume production, meeting the demands of a large-scale market.

Description

Technical Field

[0001] This utility model relates to the field of grinding tool technology, and more specifically, to a nut for bolting a grinding wheel. Background Technology

[0002] Bolted grinding wheels, as an important grinding tool, are widely used in the end-face grinding of workpieces in fields such as bearings, automotive parts, electronic molds, and castings. Their grinding performance directly affects the grinding accuracy and surface quality of the workpiece. In the structural design of bolted grinding wheels, the nut is the core fastener that connects and fixes the grinding wheel to the flange and machine tool. It is usually embedded in the bottom of the wheel during the wheel forming process and plays a key role in transmitting the fastening force and ensuring the stable operation of the grinding wheel.

[0003] Currently, the nuts used in commercially available bolt-fastening grinding wheels are mostly made of metal materials such as carbon steel and stainless steel. Although these metal nuts possess a certain degree of mechanical strength, they have significant limitations in practical applications: the interfacial bonding ability between the metal and the resin binder is poor. Even by optimizing the shape and structure of the cylindrical nut to improve its bonding stability with the grinding wheel, it is still difficult to completely eliminate the risk of the nut detaching from the resin grinding wheel. Furthermore, the complex structural design increases the difficulty of nut processing and raises production costs, which is not conducive to large-scale production and application.

[0004] With the continuous development of materials technology, resin materials are increasingly widely used in the industrial field due to their advantages such as rich variety, low cost, and flexible molding methods. Among them, various engineering plastics and their modified resins, such as phenolic resin, polyimide resin, and silicone resin, can withstand high temperatures of 180℃ and above, meeting the molding and usage environment requirements of resin-bonded grinding wheels. Furthermore, key properties such as strength and acid and alkali resistance can be further improved through physical or chemical modification, providing a feasible path for manufacturing grinding wheel nuts using plastic instead of steel. However, there are still gaps in the existing technology regarding the structural design, molding process, and compatibility of resin nuts with grinding wheels. A mature technical solution that can balance bonding strength, installation convenience, and production cost has not yet been formed, making it difficult to meet the application requirements of simple, stable, and low-cost bolt-fastened grinding wheels. Therefore, developing a nut structure that is compatible with resin-bonded grinding wheels, has excellent bonding performance, and is cost-effective has become an urgent technical problem to be solved in this field. Utility Model Content

[0005] The purpose of this utility model is to provide a nut for bolting grinding wheels, so as to solve the problem mentioned in the background art that it is difficult to meet the application requirements of bolting grinding wheels in a simple, stable and low-cost manner.

[0006] To achieve the above objectives, this utility model provides a nut for bolting a grinding wheel, comprising a grinding wheel and a fastening nut. The fastening nut comprises a hollow cylinder with internal threads and a nut. The fastening nut is embedded in the bottom of the grinding wheel, and the end face of the fastening nut is parallel to the bottom surface of the grinding wheel. The grinding wheel is fixed to a flange by a secondary bolt. The flange has several positioning holes. The secondary bolt passes through the positioning holes and the grinding wheel, and its end is locked and fixed by the fastening nut, thus fixing the grinding wheel to the flange. The upper opening of the hollow cylinder is provided with a chamfer to facilitate the insertion of the secondary bolt. The fastening nut at the bottom of the grinding wheel (2) corresponds one-to-one with the positioning hole (4) of the flange (5). The secondary bolt (6) is fastened to the fastening nut at the bottom of the grinding wheel (2) through the positioning hole (4) of the flange (5), thereby installing the grinding wheel (2) to the corresponding position on the machine tool.

[0007] From a structural perspective, this design, as defined in this claim, clarifies the core component of the nut used to bolt the grinding wheel. It includes the grinding wheel and a fastening nut consisting of a hollow cylinder with internal threads and a nut. By embedding the fastening nut into the bottom of the grinding wheel and ensuring its end face is parallel to the bottom surface of the grinding wheel, the initial assembly stability of the nut and grinding wheel is guaranteed. In terms of connection, a secondary bolt passes through a positioning hole on the flange and locks with the end of the fastening nut, establishing a fixed relationship between the grinding wheel and the flange. Simultaneously, a chamfer is provided at the upper opening of the hollow cylinder, utilizing its guiding properties to reduce the alignment difficulty when inserting the secondary bolt. The tightening fit between the secondary bolt and the fastening nut, based on the self-locking principle of threaded connections, achieves a stable connection through the friction between the threads, preventing loosening during the high-speed rotation of the grinding wheel.

[0008] Preferably, the hollow column and the nut are an integral structure, formed by injection molding, compression molding or 3D printing.

[0009] This design specifies that the hollow cylinder and nut adopt a one-piece structure, and are formed using injection molding, compression molding, or 3D printing methods. The one-piece structure design eliminates assembly gaps in split structures, improving the overall strength of the nut from the structural source; using different molding methods enables standardized, high-volume, and low-cost production of the nuts, ensuring product consistency.

[0010] Preferably, the hollow column and the nut are separate structures, formed by injection molding, compression molding or 3D printing.

[0011] This design features a separate structure for the hollow cylinder and nut, which can also be formed using injection molding, compression molding, or 3D printing. The core principle of this separate structure is to separate the two key components of the nut. For the different functional requirements of the hollow cylinder and nut, more suitable materials or structural parameters can be selected for each. For example, to ensure the strength of the internal threads of the hollow cylinder, a higher-strength resin can be used. The nut, which focuses on bonding with the grinding wheel, can have its shape adjusted to increase the bonding area and a resin with high bonding strength to the grinding wheel's adhesive can be selected. Furthermore, in the production process, if a component of the separate structure is defective, only that component needs to be replaced, reducing material waste.

[0012] Preferably, the hollow cylinder and the nut are made of any one of phenolic resin, polyimide resin, silicone resin, epoxy resin, polyphenylene ether resin or a modified high-temperature resistant resin thereof.

[0013] This setting focuses on the material selection for the hollow cylinder and nut, specifying any one of phenolic resin, polyimide resin, silicone resin, epoxy resin, and polyphenylene ether resin, or their modified high-temperature resistant resins. From a material properties perspective, these resins and modified resins possess excellent high-temperature resistance, capable of withstanding the operating temperatures during the manufacturing and use of resin-bonded grinding wheels. Furthermore, the resin material is similar to the binder material of the resin grinding wheel; according to the principle of "like dissolves like," the two have better compatibility at the molecular level, enhancing interfacial bonding. Simultaneously, through physical or chemical modification, the strength, acid and alkali resistance, and other properties of the resin material can be further improved to meet the requirements of different grinding conditions.

[0014] Preferably, the hollow cylinder is hexagonal in shape.

[0015] This setting limits the shape of the hollow cylinder to a regular hexagon; the regular hexagonal hollow cylinder utilizes the planar structure of the hexagon to reduce the rotation tendency of the cylinder within the grinding wheel during the process of combining with the grinding wheel material through the engagement of the planar surface, thereby improving the anti-torsional performance, and is especially suitable for working conditions with large torque during grinding.

[0016] Preferably, the nut is disc-shaped, bowl-shaped, or T-shaped.

[0017] This setting specifies that the nut shape should be dish-shaped, bowl-shaped, or T-shaped. A dish-shaped nut, with its outwardly extending edge, increases the contact area with the bottom of the grinding wheel. According to the pressure formula, under the same pressure, a larger contact area reduces the pressure exerted by the nut on the grinding wheel, preventing damage due to excessive local pressure. A bowl-shaped nut, with its concave arc structure, increases the area of ​​the nut covering the grinding wheel material, enhancing the mechanical engagement between the nut and the grinding wheel and improving the bonding strength. A T-shaped nut, with its laterally protruding structure, forms a "clip"-like effect, effectively limiting the axial displacement of the nut within the grinding wheel and preventing the nut from coming off the bottom of the grinding wheel.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] In this bolt-fastening grinding wheel nut, the hollow cylinder of the nut and the nut portion exhibit excellent process flexibility, regardless of whether they are formed by injection molding, compression molding, or 3D printing. This flexible and versatile forming method not only facilitates one-piece molding and simplifies the production process, but also significantly improves production efficiency, reduces production costs, and strongly promotes the industrialization of bolt-fastening grinding wheels.

[0020] Significantly enhanced bonding strength: The nuts are made from a variety of high-temperature resistant resins and their modified forms, such as phenolic resin, polyimide resin, and silicone resin. These materials are highly similar to the bonding agents used in resin grinding wheels, fundamentally solving the problem of poor bonding between metal nuts and resin grinding wheels. The similar materials exhibit better compatibility at the molecular level, allowing the nuts and grinding wheels to bond tightly during the molding process, forming strong chemical bonds. This significantly improves the bonding strength between the nuts and grinding wheels, effectively reducing the risk of the nuts detaching from the grinding wheel and ensuring the stability and reliability of the grinding wheel during high-speed operation.

[0021] Optimized overall performance of the grinding wheel: Compared with traditional metal nuts, the plastic nut of this invention is lighter. The reduced overall weight of the grinding wheel can reduce the load on the machine tool, reduce energy consumption, and improve the stability of machine tool operation. At the same time, the lightweight design helps to improve the starting and stopping speed of the grinding wheel, enhance the dynamic response performance of the grinding wheel, and thus improve the accuracy and efficiency of grinding, providing strong support for high-precision grinding operations.

[0022] The chamfered opening at the top of the hollow column cleverly guides the secondary bolts through smoothly, greatly simplifying the installation process and reducing installation time and labor costs. Furthermore, the assembly method of the nut and grinding wheel is scientifically sound. The fastening nut at the bottom of the grinding wheel precisely aligns with the positioning hole on the flange, and the secondary bolts fit tightly with the nut through the positioning hole, ensuring the accuracy and efficiency of the installation process. This reduces problems such as grinding wheel eccentricity and vibration caused by improper installation, further improving the installation quality and operational stability of the grinding wheel. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the fastening nut in this utility model;

[0024] Figure 2 This is a schematic diagram of the assembly structure of this utility model;

[0025] Figure 3 This is a schematic diagram of the structure of the grinding wheel in this utility model;

[0026] The meanings of the labels in the diagram are as follows:

[0027] 1. Hollow cylinder; 11. Internal thread; 12. Chamfer; 2. Grinding wheel; 3. Nut; 4. Locating hole; 5. Flange; 6. Secondary bolt. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] This utility model provides a nut for bolting a grinding wheel, such as... Figures 1-3 As shown, the device includes a grinding wheel 2 and a fastening nut. The fastening nut consists of two parts: a hollow cylinder 1 with internal threads 11 and a nut 3. The fastening nut is embedded in the bottom of the grinding wheel 2, and the end face of the fastening nut is parallel to the bottom surface of the grinding wheel 2. The grinding wheel 2 is fixed to the flange 5 by a secondary bolt 6. The flange 5 has several positioning holes 4. The secondary bolt 6 passes through the positioning holes 4 and the grinding wheel 2, and its end is locked and fixed by the fastening nut, thus fixing the grinding wheel 2 to the flange 5. The upper opening of the hollow cylinder 1 is provided with a chamfer 12 to facilitate the insertion of the secondary bolt 6.

[0030] The core components of the nut for bolting the grinding wheel are defined, including the grinding wheel 2 and the fastening nut consisting of a hollow column 1 with internal threads 11 and a nut 3. By embedding the fastening nut into the bottom of the grinding wheel 2 and ensuring that the end face is parallel to the bottom surface of the grinding wheel, the initial assembly stability of the nut and the grinding wheel is ensured. At the same time, a chamfer 12 is provided at the opening at the top of the hollow column 1. The guiding characteristics of the chamfer are used to reduce the alignment difficulty when the secondary bolt 6 is inserted.

[0031] The rational structural design ensures that the fastening nut and the grinding wheel form a stable integral structure, preventing the nut from shifting during the use of the grinding wheel. The chamfer 12 significantly improves the ease of installation of the secondary bolt 6, reduces installation time, and lowers the difficulty of manual operation, laying the foundation for the efficient installation of the grinding wheel onto the machine tool.

[0032] In this embodiment, the hollow column 1 and the nut 3 are an integral structure, formed by injection molding, compression molding or 3D printing.

[0033] The hollow cylinder 1 and nut 3 are designed as a single unit, formed using injection molding, compression molding, or 3D printing. This integrated design eliminates assembly gaps inherent in split structures, resulting in a more compact overall structure and significantly improved connection strength and stability of the nut. It effectively prevents loosening and deformation caused by uneven stress or long-term vibration, thus enhancing the overall strength of the nut from its structural origin. Different molding methods can be selected to achieve high-precision, high-volume production, meeting the demands of a large-scale market.

[0034] Specifically, the hollow column 1 and the nut 3 are separate structures, formed by injection molding, compression molding or 3D printing.

[0035] The hollow cylinder 1 and nut 3 are designed as separate structures, also formed by injection molding, compression molding, or 3D printing. The core principle of the separate structure is to separate the two key components of the nut. For the different functional requirements of the hollow cylinder 1 and nut 3, more suitable materials or structural parameters can be selected for each. For example, the hollow cylinder 1 needs to ensure the strength of the internal thread, so a higher strength resin formula can be selected. The nut 3 focuses on the bonding with the grinding wheel, so its shape can be adjusted to increase the bonding area and a resin with high bonding strength with the bonding agent can be selected. Moreover, in the production process, if a component is defective, only that component needs to be replaced, reducing material waste.

[0036] The flexibility of the split structure allows each component of the nut to be optimized as needed, further improving the overall performance of the nut. For example, the increased strength of the hollow column 1 can improve the thread bearing capacity, and the optimization of the nut 3 can improve the bonding strength with the grinding wheel. At the same time, it reduces material loss during the production process and reduces production costs.

[0037] Furthermore, the materials used for the hollow column 1 and the nut 3 are any one of phenolic resin, polyimide resin, silicone resin, epoxy resin, polyphenylene ether resin or their modified high-temperature resistant resin.

[0038] The hollow cylinder 1 and the nut 3 are specified as being made of any one of phenolic resin, polyimide resin, silicone resin, epoxy resin, or polyphenylene ether resin, or a modified high-temperature resistant resin thereof. From a material properties perspective, these resins and modified resins possess excellent high-temperature resistance, capable of withstanding working temperatures of no less than 180°C during the manufacturing and use of resin-bonded grinding wheels. Furthermore, the resin material is similar to the binder material of the resin grinding wheel; according to the principle of "like dissolves like," the two have better compatibility at the molecular level, enhancing interfacial bonding. Simultaneously, through physical or chemical modification, the strength, acid and alkali resistance, and other properties of the resin material can be further improved to meet the requirements of different grinding conditions.

[0039] The excellent compatibility between the resin material and the grinding wheel bonding agent significantly improves the bonding strength between the nut and the grinding wheel, effectively solving the problems of poor bonding force and easy detachment between traditional metal nuts and resin grinding wheels. The modified resin material can adapt to more complex grinding environments, such as in the presence of corrosive coolant, and can still maintain good performance without affecting the normal use of the grinding wheel.

[0040] Furthermore, the hollow cylinder 1 has a regular hexagonal shape.

[0041] The hollow cylinder 1 is defined as having a regular hexagonal shape. The regular hexagonal hollow cylinder utilizes the planar structure of the hexagon to reduce the rotational tendency of the cylinder within the grinding wheel during the grinding process by interlocking the planar surface with the grinding wheel material, thereby improving its torsional resistance. It is especially suitable for working conditions with high torque during grinding.

[0042] Furthermore, the nut 3 is shaped like a saucer, a bowl, or a T.

[0043] Nut 3 can be dish-shaped, bowl-shaped, or T-shaped. A dish-shaped nut, with its outwardly extending edge, increases the contact area with the bottom of the grinding wheel. According to the pressure formula, under the same pressure, an increased contact area reduces the pressure exerted by the nut on the grinding wheel, preventing damage due to excessive local pressure. A bowl-shaped nut, with its concave arc structure, increases the area of ​​the nut covering the grinding wheel material, enhancing the mechanical engagement between the nut and the grinding wheel and improving the bonding strength. A T-shaped nut, with its laterally protruding structure, creates a "clip"-like effect, effectively limiting the axial displacement of the nut within the grinding wheel and preventing the nut from coming off the bottom of the grinding wheel.

[0044] Different nut shapes enhance the bonding performance between the nut and the grinding wheel from various perspectives. Disc-shaped nuts protect the bottom structure of the grinding wheel, reducing the risk of damage; cup-shaped nuts strengthen mechanical engagement, further improving bonding strength; T-shaped nuts restrict axial displacement, preventing nut dislodgement. Multiple shape options accommodate grinding wheels with different structures and application requirements, improving product versatility and adaptability.

[0045] Furthermore, the fastening nut at the bottom of the grinding wheel 2 corresponds one-to-one with the positioning hole 4 of the flange 5, and the auxiliary bolt 6 is fastened to the fastening nut at the bottom of the grinding wheel 2 through the positioning hole 4 of the flange 5, thereby installing the grinding wheel 2 into the corresponding position on the machine tool.

[0046] When using the bolt-fastening nut for grinding wheels of this utility model, firstly, select either an integrated or split-type fastening nut according to the usage requirements. The integrated type is formed in one step through injection molding, compression molding, or 3D printing. The split type involves separately machining the hollow cylinder 1 and the nut 3 before assembly. Select a suitable resin material; for example, polyimide-modified resin is chosen for high-load conditions, while phenolic resin is chosen for normal conditions. During the grinding wheel 2 molding process, the fastening nut is embedded in the bottom of the grinding wheel, ensuring that the end face of the nut is parallel to the bottom surface of the grinding wheel. After the grinding wheel cures, the nut and the grinding wheel form a stable integrated structure.

[0047] Place the grinding wheel 2 above the flange 5 and adjust its position so that the fastening nut at the bottom of the grinding wheel corresponds one-to-one with the positioning holes 4 of the flange 5. Ensure that each positioning hole 4 is aligned with the upper chamfer 12 of the hollow column 1, with the chamfer 12 facing the positioning hole. Take the auxiliary bolt 6, align one end with the positioning hole 4 of the flange 5, and with the guidance of the upper chamfer 12 of the hollow column 1, easily insert it into the positioning hole 4 and through the grinding wheel 2 until the end of the auxiliary bolt 6 contacts the internal thread 11 of the hollow column 1.

[0048] Using a wrench or similar tool, rotate the secondary bolt 6 to ensure it fully engages with the internal thread 11 of the hollow cylinder 1. Utilize the self-locking property of the thread to gradually tighten it until the flange 5 and grinding wheel 2 are tightly fitted together without any noticeable gap. During this process, because the positioning holes 4 correspond one-to-one with the fastening nuts and their thread specifications match, the tightening torque of each secondary bolt 6 is uniform, ensuring balanced force on the connection surface between the flange 5 and the grinding wheel 2 and preventing wheel eccentricity.

[0049] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A nut for bolting a grinding wheel, characterized in that: The assembly includes a grinding wheel (2) and a fastening nut. The fastening nut comprises a hollow cylinder (1) with internal threads (11) and a nut (3). The fastening nut is embedded in the bottom of the grinding wheel (2), and the end face of the fastening nut is parallel to the bottom surface of the grinding wheel (2). The grinding wheel (2) is fixed to a flange (5) by a secondary bolt (6). The flange (5) has several positioning holes (4). The secondary bolt (6) passes through the positioning holes (4) and the grinding wheel (2). The end is locked and fixed by a fastening nut, and the grinding wheel (2) is fixed on the flange (5). The upper opening of the hollow column (1) is provided with a chamfer (12) to facilitate the insertion of the auxiliary bolt (6). The fastening nut at the bottom of the grinding wheel (2) corresponds one-to-one with the positioning hole (4) of the flange (5). The auxiliary bolt (6) is fastened to the fastening nut at the bottom of the grinding wheel (2) through the positioning hole (4) of the flange (5), thereby installing the grinding wheel (2) into the corresponding position of the machine tool.

2. The nut for bolting a grinding wheel according to claim 1, characterized in that: The hollow column (1) and the nut (3) are an integral structure, formed by injection molding, compression molding or 3D printing.

3. The nut for bolting a grinding wheel according to claim 1, characterized in that: The hollow column (1) and the nut (3) are separate structures, formed by injection molding, compression molding or 3D printing.

4. The nut for bolting a grinding wheel according to claim 1, characterized in that: The hollow column (1) and the nut (3) are made of any one of phenolic resin, polyimide resin, silicone resin, epoxy resin, polyphenylene ether resin or its modified high-temperature resistant resin.

5. The nut for bolting a grinding wheel according to claim 1, characterized in that: The hollow column (1) is hexagonal in shape.

6. The nut for bolting a grinding wheel according to claim 1, characterized in that: The nut (3) is shaped like a dish, a bowl, or a T-shaped outward expansion.

7. The nut for bolting a grinding wheel according to claim 1, characterized in that: The number of positioning holes (4) is matched with the number of fastening nuts at the bottom of the grinding wheel (2), and the specifications of the internal thread (11) of the hollow column (1) are matched with the thread specifications of the auxiliary bolt (6) used in conjunction to achieve a stable fastening fit.

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