Bowl-shaped groove grinding wheel device based on centrifugal liquid supply

Abstract

The application provides a bowl-shaped groove grinding wheel device based on centrifugal liquid supply, which adopts a split design and comprises a centrifugal liquid collecting ring, a grinding wheel base, a grinding unit and a tool holder connecting assembly. The centrifugal liquid collecting ring is fixed above the bowl-shaped grinding wheel base by fasteners, and the inner conical surface can effectively prevent the rebound of cutting fluid, thereby efficiently collecting and guiding the cutting fluid. A series of uniformly distributed inclined flow guide holes are formed in the grinding wheel base, and a conical flow guide surface is arranged inside. During work, the cutting fluid is captured by the centrifugal liquid collecting ring, and is sequentially sent to the grinding area through the inclined flow guide holes and the conical flow guide surface under the action of centrifugal force and gravity. The split structure of the application enables the centrifugal liquid collecting ring to be made of light materials to reduce the load of the main shaft, and the grinding wheel base as a consumable can be replaced alone, and the centrifugal liquid collecting ring can be repeatedly used to reduce the long-term use cost. Meanwhile, the structure is simple and reliable, and greatly improves the utilization efficiency of cutting fluid and the grinding processing quality.

Description

Technical Field

[0001] This invention relates to the field of grinding technology, specifically to a bowl-groove grinding wheel device based on centrifugal fluid supply. More particularly, it is a bowl-groove grinding wheel device capable of effectively delivering cutting fluid to the grinding area. Background Technology

[0002] In grinding, especially face grinding, cutting fluid is crucial for reducing grinding temperature, minimizing workpiece thermal damage, flushing away chips, and extending grinding wheel life. Traditional pouring cooling methods, due to the airflow barrier created by the high-speed rotation of the grinding wheel, prevent most of the cutting fluid from reaching the grinding arc zone, resulting in low cooling efficiency and potentially causing workpiece burns and reduced machining accuracy.

[0003] In existing technologies, some internally cooled grinding wheels attempt to direct cutting fluid to the working area by incorporating channels within the wheel. However, these solutions are often structurally complex, costly to manufacture, or suffer from inaccurate fluid flow guidance. For cup-shaped grinding wheels, designing a simple, reliable, centrifugal fluid supply structure that requires no external high-pressure system remains a technical challenge. There is an urgent need for a new type of grinding wheel device capable of actively and efficiently delivering cutting fluid to the grinding area.

[0004] Patent document CN109551363A discloses a novel internally cooled grinding wheel. This invention introduces coolant from the top of the grinding wheel body through an independent coolant guide pipe, guiding the coolant to the lower outer edge of the grinding wheel body. Simultaneously with grinding, the coolant cools, lubricates, and flushes the grinding area. However, patent document CN109551363A fails to address the problems of insufficient coolant collection and guidance accuracy in existing internally cooled grinding wheels, leading to uneven cooling and lubrication in the grinding area, and the problem of poor waste fluid and grinding debris discharge during grinding, which can easily cause secondary damage or reduced processing efficiency. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a bowl-shaped grooved grinding wheel device based on centrifugal liquid supply.

[0006] A bowl-shaped grooved grinding wheel device based on centrifugal liquid supply according to the present invention includes a bowl-shaped grinding wheel base, a centrifugal liquid collection ring, and a grinding unit; The cup-shaped grinding wheel base has a working end and a liquid collecting end in the axial direction. A centrifugal liquid collecting ring is provided at the liquid collecting end, and a first guide cone surface is formed on the inner side of the centrifugal liquid collecting ring. The radial dimension of the first guide cone surface increases in the direction toward the liquid collecting end. The working end of the bowl-shaped grinding wheel base is provided with an annular protrusion, and a second guide cone surface is formed on the inner side of the annular protrusion. The radial dimension of the second guide cone surface increases in the direction away from the liquid collection end. The grinding unit is disposed on the annular protrusion. The bowl-shaped grinding wheel base includes guide holes distributed circumferentially. The guide holes include a guide hole inlet and a guide hole outlet. The guide hole inlet corresponds to the first guide cone surface, and the guide hole outlet corresponds to the second guide cone surface. When the bowl-shaped grooved grinding wheel device performs grinding, the rotation of the bowl-shaped grinding wheel base causes the cutting fluid to generate centrifugal force. The first guide cone surface collects and guides the cutting fluid into the inlet of the guide hole until it flows through the outlet of the guide hole to the second guide cone surface, and finally delivers it to the contact area between the grinding unit and the workpiece.

[0007] Preferably, the angle between the first guide cone surface, the second guide cone surface, the guide hole and the axial direction of the bowl-shaped grinding wheel base is equal to α, and the value of the angle α is in the range of 30° to 60°.

[0008] Preferably, the edge of the first guide cone surface near the liquid collecting end covers the inlet of the guide hole; With the center of the bowl-shaped grinding wheel base as a reference, the edge of the first guide cone surface near the liquid collection end is aligned with the radial midpoint of the guide hole inlet on the side away from the center of the bowl-shaped grinding wheel base; The edge of the second guide cone near the liquid collection end surrounds the radial outer side of the guide hole outlet, which is used to retain the transition area between the guide hole and the second guide cone, and promote the flow of cutting fluid from the guide hole into the second guide cone.

[0009] Preferably, the centrifugal liquid collecting ring extends radially outward from the point of maximum radial dimension of the first guide cone surface to form an axial positioning end face, and then extends axially towards the working end to form a positioning cylindrical surface on the radially inner side. The positioning cylindrical surface of the centrifugal liquid collecting ring mates with the outer cylindrical surface of the bowl-shaped grinding wheel base to achieve radial positioning, and the axial positioning end face of the centrifugal liquid collecting ring mates with the liquid collecting end face of the bowl-shaped grinding wheel base to achieve axial positioning.

[0010] Preferably, the centrifugal liquid collection ring is fixed to the cup-shaped grinding wheel base by circumferentially distributed fasteners, and the cup-shaped grinding wheel base is provided with a corresponding connection structure adapted to the fasteners.

[0011] Preferably, the centrifugal collection ring is made of a lightweight material, which includes at least one of aluminum alloy and engineering plastics.

[0012] Preferably, it further includes: a tool holder connecting assembly; The tool holder connecting assembly is connected to the cup-shaped grinding wheel base and is used to install the cup-shaped grooved grinding wheel device onto the grinding machine spindle; The tool holder connection assembly includes a tool holder, a lock nut, and a second anti-loosening washer; The cup-shaped grinding wheel base is fitted onto the extended shaft of the tool holder, and the second anti-loosening washer and the locking nut are sequentially assembled on the tool holder, thereby axially pressing and fixing the cup-shaped grinding wheel base.

[0013] Preferably, the plurality of guide holes are evenly distributed along the circumference of the bowl-shaped grinding wheel base.

[0014] Preferably, the grinding unit is located at the end of the annular protrusion away from the liquid collection end; The grinding unit can be a split structure or an integrated structure. The split structure grinding unit includes multiple independent grinding blocks, while the integrated structure grinding unit is a grooved grinding wheel ring.

[0015] Preferably, for a split-type grinding unit, multiple independent grinding blocks are arranged at intervals along the circumference, and chip removal grooves are formed between adjacent grinding blocks; For a grinding unit with an integrated structure, the grooves on the grinding wheel ring serve as chip removal grooves; The chip removal groove connects the radial inner and outer sides of the grinding unit and is used to discharge grinding chips and used cutting fluid.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention uses a two-stage flow guiding structure, combining inclined guide holes with conical guide surfaces, to precisely control the flow direction and landing point of the cutting fluid, ensuring that the cutting fluid reaches the contact point between the grinding unit and the workpiece directly, and avoiding the formation of a cooling and lubrication blind zone due to fluid flow deviation.

[0017] 2. This invention effectively reduces the spindle load when the grinding wheel rotates at high speed by adopting a split structure and using lightweight materials, thereby reducing wear and extending service life.

[0018] 3. This invention achieves liquid supply and flow guidance functions by relying on the structure of the grinding wheel body, resulting in low manufacturing cost, convenient maintenance, and reduced failure rate. Attached Figure Description

[0019] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is an axial half-sectional view that mainly illustrates the structure of the device in this invention; Figure 2 This is a top view that mainly illustrates the relative positional relationship between the guide hole and the centrifugal liquid collection ring of the present invention.

[0020] As shown in the figure: Detailed Implementation

[0021] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0022] The following is combined Figure 1 and Figure 2 A preferred embodiment of the present invention will be described in detail below. The bowl-shaped grooved grinding wheel device of this embodiment is a split design, and its core components include a centrifugal liquid collecting ring 1, a bowl-shaped grinding wheel base 4, a grinding unit 5, and a tool holder connecting assembly. The centrifugal liquid collecting ring 1 is conical in shape, and the two ends of the bowl-shaped grinding wheel base 4 in opposite axial directions are respectively configured as a working end 43 and a liquid collecting end 44. The center of the bowl-shaped grinding wheel base 4 has a shaft hole that mates with the tool holder 8. The tool holder connecting assembly includes the tool holder 8, a locking nut 7, and a second anti-loosening washer 6.

[0023] During assembly, the centrifugal collecting ring 1 is first placed over the collecting end 44 of the bowl-shaped grinding wheel base 4. A first guide cone surface 11 is formed on the inner side of the centrifugal collecting ring 1, and the radial dimension of the first guide cone surface 11 increases in the direction toward the collecting end 44. The centrifugal collecting ring 1 extends radially outward from the point where the radial dimension of the first guide cone surface 11 is maximum, forming a horizontal mounting part. The bottom surface of the mounting part forms an axial positioning end face. Subsequently, the centrifugal collecting ring 1 extends axially toward the working end 43, forming a protrusion, and a positioning cylindrical surface is formed on its radially inner side. The positioning cylindrical surface of the centrifugal collecting ring 1 mates with the outer cylindrical surface of the bowl-shaped grinding wheel base 4 to achieve radial positioning, and the axial positioning end face of the centrifugal collecting ring 1 mates with the end face of the collecting end 44 of the bowl-shaped grinding wheel base 4 to achieve axial positioning.

[0024] The centrifugal collecting ring 1 is fixedly installed on the cup-shaped grinding wheel base 4 by four or more circumferentially distributed fastening screws 3 and the first anti-loosening washer 2 (fastener). The cup-shaped grinding wheel base 4 has threaded holes machined at corresponding positions. The threaded holes are connection structures adapted to the fasteners and are used for the fastening connection of the fastening screws.

[0025] The centrifugal collecting ring 1 can be made of lightweight materials such as aluminum alloy or engineering plastics to reduce the load on the spindle. Furthermore, the cup-shaped grinding wheel base 4 is a consumable and can be replaced separately, while the centrifugal collecting ring 1 can be reused, significantly reducing long-term operating costs. This split design eliminates the need for complex sealing and external high-pressure systems, primarily utilizing the grinding wheel body structure to achieve its function. It boasts low manufacturing costs, ease of maintenance, and high reliability.

[0026] The cup-shaped grinding wheel base 4 is fitted onto the extended shaft of the tool holder 8 through its central shaft hole. Radial positioning is achieved using the cylindrical surface of the shaft hole of the cup-shaped grinding wheel base 4 and the outer cylindrical surface of the tool holder 8, while axial positioning is achieved using the end face of the cup-shaped grinding wheel base 4 and the stepped annular surface of the tool holder 8. The second anti-loosening washer 6 and the locking nut 7 are then sequentially fitted onto the tool holder 8. A special wrench is inserted into the wrench hole 71 to tighten the nut, thereby axially pressing and fixing the cup-shaped grinding wheel base 4 onto the tool holder 8.

[0027] The working end 43 of the bowl-shaped grinding wheel base 4 is provided with an annular protrusion 45. A second guide cone surface 42 is formed on the inner side of the annular protrusion 45. The radial dimension of the second guide cone surface 42 is expanded in the direction away from the liquid collection end 44. The grinding unit 5 is fixedly disposed at the end of the annular protrusion 45 away from the liquid collection end 44. The working end 43 of the bowl-shaped grinding wheel base 4 is provided with a chip removal groove 51. In this embodiment, the grinding unit 5 is a split structure, composed of multiple independent superhard abrasive (such as diamond or CBN) grinding blocks. The multiple independent grinding blocks are arranged circumferentially at intervals, and chip removal grooves 51 are formed between adjacent grinding blocks. Of course, the grinding unit 5 can also adopt an integrated structure, that is, a grinding wheel ring with grooves. The grooves on the grinding wheel ring directly serve as chip removal grooves 51. The chip removal grooves 51 connect the radial inner side and the outer side of the grinding unit 5 and are used to discharge the grinding chips generated during grinding and the used cutting fluid.

[0028] Working principle This device is mounted on the grinding machine spindle via the tool holder 8 and rotates at high speed. The cutting fluid pumping system sprays cutting fluid onto the device from above. The fluid flow first enters the rotating centrifugal collecting ring 1. The first guide cone 11 effectively prevents droplet rebound, causing the cutting fluid to flow and accumulate along the first guide cone 11 to its outer edge under the combined action of centrifugal force and gravity, eventually forming a liquid ring at the bottom of the outermost edge of the centrifugal collecting ring 1.

[0029] The upper wall of the bowl-shaped grinding wheel base 4 has a plurality of guide holes 41 evenly distributed circumferentially. The end of each guide hole 41 near the liquid collection end 44 is the guide hole inlet 411, and the end near the working end 43 is the guide hole outlet 412. The guide hole inlet 411 corresponds to the first guide cone surface 11, and the guide hole outlet 412 corresponds to the second guide cone surface 42.

[0030] like Figure 2 As shown, AD is the central axis parallel to the radial direction of the guide hole inlet 411 (closed arc ABCDEF) and the bowl-shaped grinding wheel base 4; BF is the central axis perpendicular to the radial direction of the guide hole inlet 411 and the bowl-shaped grinding wheel base 4; O is the intersection of AD and BF, which is also the geometric center of the guide hole inlet 411. The edge (arc CGE) of the first guide cone surface 11 near the liquid collecting end 44 covers the guide hole inlet 411. Figure 2From a top-down perspective, the arc CGE intersects with the arc BDF instead of being tangent, and region CDE is the projection of the area where the inlet of the guide hole 411 is blocked by the centrifugal collection ring 1.

[0031] More specifically, the G-spot can be used as an auxiliary point. Figure 2 The midpoint of the OD segment, i.e., the center of the bowl-shaped grinding wheel base (4), is aligned with the radial midpoint of the first guide cone surface (11) near the liquid collection end (44) and the side of the guide hole inlet (411) away from the center of the bowl-shaped grinding wheel base (4). This design is mainly based on the following considerations: the cutting fluid has the characteristic of adhering to the wall surface under the action of centrifugal force. When the amount of cutting fluid is small, only a thin layer of cutting fluid near the wall of the first guide cone surface 11 enters the guide hole 41, and the guiding efficiency is reduced from the attached layer. Figure 2 The length of the arc CGE is determined by the fact that, to maximize this length, point G on the arc CGE needs to be as close as possible to the adjacent point. Figure 2 Point O in the diagram; when the amount of cutting fluid is large, the thickness of the cutting fluid near the wall of the first guide cone 11 is large and completely covers the guide hole 41, and the guiding efficiency is reduced by the attached... Figure 2 The area of ​​the central region ABCGEF is determined by the fact that, to maximize this area, point G needs to be as close as possible to the surrounding area. Figure 2 Point D in the diagram; the above design is obtained by combining the two working conditions.

[0032] Due to the pressure of the conical surface, the cutting fluid flows through the corresponding guide hole 41 on the cup-shaped grinding wheel base 4. The guide hole 41 further accelerates the fluid flow using centrifugal force and gravity, guiding it to the second guide cone 42. The transition between the guide hole outlet 412 and the second guide cone 42 is an unobstructed structure, and the edge of the second guide cone 42 near the fluid collection end 44 is located radially outside the guide hole outlet 412. At this time, the cutting fluid is about to enter the second guide cone 42 (large space) from the guide hole 41 (small space). The unobstructed design can maximize the area of ​​the transition region between the small space and the large space, promoting the smooth flow of cutting fluid from the guide hole 41 into the second guide cone 42, ensuring the smooth flow of subsequent cutting fluid.

[0033] The first guide cone 11, the second guide cone 42, the guide hole 41, and the axial angle between the guide cone 11, the second guide cone 42, and the cup-shaped grinding wheel base 4 are all equal, α. Maintaining a consistent inclination among these three surfaces reduces the impact on the cutting fluid during flow, ensuring smoother flow and maximizing the amount of cutting fluid delivered to the grinding area, thus improving cooling efficiency. The angle α ranges from 30° to 60°, optimized based on the following considerations: Too small an angle α will result in a component of the centrifugal force F diagonally downwards along the wall. sinαIf the angle is too small, the cutting fluid will easily be thrown out from above and cannot be guided to the grinding area through the guide hole 41. If the included angle α is too large, it will increase the machining length of the guide hole 41, increase the machining difficulty and cost, and at the same time, with the height of the first guide cone surface 11 remaining unchanged, its volume for holding cutting fluid will decrease, which is not conducive to the collection of cutting fluid.

[0034] After the fluid flow impacts the second guide cone surface 42, it is fully dispersed and its flow direction is changed. It is then evenly sprayed along the second guide cone surface 42 onto the contact area between the working grinding unit 5 and the workpiece, effectively cooling and lubricating the grinding points of the workpiece. This greatly improves the utilization efficiency of the cutting fluid and the grinding quality. The used waste fluid, along with the grinding chips, is thrown out from the chip removal groove 51, completing the entire working cycle.

[0035] This invention utilizes the centrifugal force of the grinding wheel's own rotation as a power source to deliver cutting fluid to the grinding area, significantly improving the efficiency of cutting fluid capture and delivery. Through a two-stage flow guiding structure consisting of a first guide cone 11, a guide hole 41, and a second guide cone 42, combined with the shielding setting of the guide hole inlet 411, the unobstructed design at the transition of the guide hole outlet 412, and the limitation of the included angle of the above three, precise control of the fluid flow direction and landing point is achieved, ensuring that the cutting fluid reaches the grinding point directly.

[0036] It should be noted that the above embodiments are merely preferred embodiments of the present invention, used to illustrate the technical features and advantages of the present invention in detail, and not to limit the scope of protection. Under the core design concept of the present invention, for example, the specific shape, size, and fixing method of the centrifugal liquid collecting ring 1 and the cup-shaped grinding wheel base 4, as well as the specific form of the grinding unit 5, can be adaptively adjusted and modified by those skilled in the art according to actual processing requirements. These equivalent variations and substitutions all fall within the scope of protection defined by the claims of the present invention.

[0037] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0038] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A bowl-shaped grooved grinding wheel device based on centrifugal liquid supply, characterized in that, It includes a bowl-shaped grinding wheel base (4), a centrifugal liquid collection ring (1), and a grinding unit (5); The cup-shaped grinding wheel base (4) has a working end (43) and a liquid collecting end (44) in the axial direction. A centrifugal liquid collecting ring (1) is placed over the liquid collecting end (44), and a first guide cone surface (11) is formed on the inner side of the centrifugal liquid collecting ring (1). The radial dimension of the first guide cone surface (11) increases in the direction toward the liquid collecting end (44). The working end (43) of the bowl-shaped grinding wheel base (4) is provided with an annular protrusion (45), and a second guide cone surface (42) is formed on the inner side of the annular protrusion (45). The radial dimension of the second guide cone surface (42) is expanded in the direction away from the liquid collection end (44). The grinding unit (5) is provided on the annular protrusion (45). The bowl-shaped grinding wheel base (4) includes guide holes (41) distributed along the circumference. The guide holes (41) include a guide hole inlet (411) and a guide hole outlet (412). The guide hole inlet (411) corresponds to the first guide cone surface (11), and the guide hole outlet (412) corresponds to the second guide cone surface (42). When the bowl-shaped grooved grinding wheel device performs grinding, the bowl-shaped grinding wheel base (4) rotates to generate centrifugal force for the cutting fluid. The first guide cone (11) collects and guides the cutting fluid into the guide hole inlet (411) until it flows through the guide hole outlet (412) to the second guide cone (42), and finally delivers it to the contact area between the grinding unit (5) and the workpiece. The angles between the first guide cone (11), the second guide cone (42), the guide hole (41) and the axial direction of the bowl-shaped grinding wheel base (4) are all equal to α, and the range of the angle α is 30° to 60°. The edge of the first guide cone (11) near the liquid collection end (44) covers the top of the guide hole inlet (411); With the center of the bowl-shaped grinding wheel base (4) as the reference, the edge of the first guide cone surface (11) near the liquid collection end (44) is aligned with the radial midpoint of the guide hole inlet (411) away from the center of the bowl-shaped grinding wheel base (4); The edge of the second guide cone (42) near the liquid collection end (44) surrounds the radial outer side of the guide hole outlet (412) to retain the transition area between the guide hole (41) and the second guide cone (42) and promote the flow of cutting fluid from the guide hole (41) into the second guide cone (42). The centrifugal liquid collection ring (1) extends radially outward from the point of maximum radial dimension of the first guide cone (11) to form an axial positioning end face, and then extends axially toward the working end (43) to form a positioning cylindrical surface on the radial inner side. The positioning cylindrical surface of the centrifugal liquid collecting ring (1) is matched with the outer cylindrical surface of the bowl-shaped grinding wheel base (4) to achieve radial positioning, and the axial positioning end face of the centrifugal liquid collecting ring (1) is matched with the liquid collecting end (44) end face of the bowl-shaped grinding wheel base (4) to achieve axial positioning.

2. The bowl-shaped grooved grinding wheel device based on centrifugal liquid supply according to claim 1, characterized in that, The centrifugal collection ring (1) is fixed to the cup-shaped grinding wheel base (4) by circumferentially distributed fasteners. The cup-shaped grinding wheel base (4) is provided with a corresponding connection structure adapted to the fasteners. The fasteners include a first anti-loosening washer (2).

3. The bowl-shaped grooved grinding wheel device based on centrifugal liquid supply according to claim 1, characterized in that, The centrifugal collection ring is made of a lightweight material, which includes at least one of aluminum alloy and engineering plastics.

4. The bowl-shaped grooved grinding wheel device based on centrifugal liquid supply according to claim 2, characterized in that, Also includes: Tool holder connection assembly; The tool holder connecting assembly is connected to the cup-shaped grinding wheel base (4) for mounting the cup-shaped grooved grinding wheel device to the grinding machine spindle; The tool holder connection assembly includes a tool holder (8), a locking nut (7), and a second anti-loosening washer (6); The cup-shaped grinding wheel base (4) is sleeved on the extended shaft of the tool holder (8), and the second anti-loosening washer (6) and the locking nut (7) are sequentially assembled on the tool holder (8), thereby axially pressing and fixing the cup-shaped grinding wheel base (4).

5. The bowl-shaped grooved grinding wheel device based on centrifugal liquid supply according to claim 1, characterized in that, The multiple guide holes (41) are evenly distributed along the circumference of the bowl-shaped grinding wheel base (4).

6. The bowl-shaped grooved grinding wheel device based on centrifugal liquid supply according to claim 1, characterized in that, The grinding unit (5) is located at the end of the annular protrusion (45) away from the liquid collection end (44); The grinding unit (5) is either a split structure or an integrated structure. The split structure grinding unit (5) includes multiple independent grinding blocks, while the integrated structure grinding unit (5) is a grinding wheel ring with grooves.

7. The bowl-shaped grooved grinding wheel device based on centrifugal liquid supply according to claim 6, characterized in that, For a split-structure grinding unit (5), multiple independent grinding blocks are arranged at intervals along the circumference, and chip removal grooves (51) are formed between adjacent grinding blocks. For the grinding unit (5) with an integrated structure, the grooves on the grinding wheel ring serve as chip removal grooves (51). The chip removal groove (51) connects the radial inner side and the outer side of the grinding unit (5) and is used to discharge the grinding chips generated during grinding and the used cutting fluid.

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