Split type grinding tool for brake disc turning and grinding machine

Abstract

The utility model relates to a grinding tool, in particular to a split type grinding tool for a brake disc turning and grinding machine, which comprises a grinding wheel and is different from the prior art in that the split type grinding tool further comprises an aluminum alloy circular ring and a steel cylinder, the grinding wheel is fixedly connected to one end face of the aluminum alloy circular ring, and the other end face of the aluminum alloy circular ring extends outwards from the inner circle of the aluminum alloy circular ring to form a convex ring. A plurality of through holes passing through the convex ring are formed in the aluminum alloy circular ring in a circumferential array manner; a plurality of screw holes corresponding to the through holes are formed in one end face of the steel cylinder, a plurality of screws penetrate through the through holes to be in threaded connection with the screw holes, and one end face of the steel cylinder extends towards the center to form a center hole suitable for clamping. Compared with the prior art, the combined structure of the steel cylinder and the aluminum alloy circular ring is adopted, so that the overall strength is improved, chatter marks in the machining process are reduced, and the appearance quality of a product is improved.

Description

Technical Field

[0001] The utility model relates to a grinding tool, in particular to a split grinding tool used for a brake disc grinding machine. Background Art

[0002] Brake discs are key components in automotive braking systems. Their primary function is to slow the vehicle or bring it to a stop through friction with the brake pads. Brake disc performance directly impacts the vehicle's braking effectiveness, placing stringent demands on their machining accuracy and surface quality. Currently, brake discs are primarily machined using turning and grinding machines. This method enables high-precision and efficient production of brake discs.

[0003] Grinding the brake disc's braking surface with a mold is a crucial step in the manufacturing process. However, existing molds have several drawbacks: their base is typically made of aluminum alloy, which, while lightweight, lacks strength. This can lead to chatter marks on the braking surface during machining, affecting the product's appearance. Furthermore, grinding wheels wear quickly, necessitating frequent replacement. This process requires re-clamping and re-alignment, increasing workload and impacting machining efficiency. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the utility model proposes a split grinding tool for a brake disc turning and grinding machine, aiming to improve the strength and durability of the grinding tool and improve the overall processing efficiency and product quality.

[0005] For this reason, the technical solution adopted in this utility model is:

[0006] A split grinding tool for a brake disc grinding machine includes a grinding wheel. Unlike the prior art, it also includes an aluminum alloy ring and a steel cylinder. The grinding wheel is fixed to one end face of the aluminum alloy ring, and the other end face of the aluminum alloy ring extends outward from its inner circle to form a convex ring. The aluminum alloy ring has a plurality of through holes arranged in a circumferential array passing through the convex ring; a plurality of screw holes corresponding to the through holes are provided on one end face of the steel cylinder, and a plurality of screws pass through the through holes and are screwed to the screw holes. One end face of the steel cylinder extends toward the center to form a center hole suitable for clamping.

[0007] Furthermore, the through hole is expanded to form a countersunk head at the end fixed to the grinding wheel, and the head of the screw is embedded in the countersunk head.

[0008] Furthermore, the abutting surface of the steel cylinder extends toward the inner circle of the aluminum alloy ring to form a limiting ring, the cross section of which is a right-angled trapezoid with a straight inside and an oblique outside, and the maximum outer diameter of the limiting ring is equal to the inner diameter of the aluminum alloy ring.

[0009] Furthermore, the included angle between the outer oblique side and the bottom side of the cross section of the limiting ring is 70° to 80°.

[0010] Furthermore, the root of the limiting ring is cleared to form an overrun groove.

[0011] Furthermore, the thickness of the aluminum alloy ring is at least 8 mm.

[0012] Furthermore, the wall thickness of the steel cylinder is at least 6 mm.

[0013] Furthermore, the width of the convex ring is 1.2 to 1.5 times the thickness of the aluminum alloy ring.

[0014] Furthermore, the ratio of the diameter of the screw to the diameter of the through hole is 0.8:1 to 0.95:1.

[0015] Furthermore, the number of the through holes is an even number greater than 8.

[0016] Compared with the prior art, the present invention improves the overall strength and reduces the generation of chatter marks during the processing by adopting a combined structure of a steel cylinder and an aluminum alloy ring, thereby improving the appearance quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of the aluminum alloy ring of the utility model.

[0018] Figure 2 This is a structural diagram of the aluminum alloy ring of the utility model from another perspective.

[0019] Figure 3 This is a structural diagram of the steel cylinder of the utility model.

[0020] Figure 4 This is a side structural diagram of the steel cylinder of the utility model.

[0021] Figure 5 for Figure 4 A partial enlarged view of point A in the middle.

[0022] Figure 6 It is a structural diagram of the present utility model.

[0023] Figure 7 for Figure 6 sectional view of .

[0024] Figure 8 for Figure 7 A partial enlarged view of point B in the middle. DETAILED DESCRIPTION

[0025] In the description of the utility model, it needs to explain, the term "center", "upper", "lower", "left", "right", "vertical", "horizontal", "internal", "external" and so on indicate the orientation or position relation is based on the orientation or position relation shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and not indicate or imply that the device or element must have a particular orientation, construct and operate in a particular orientation, therefore, it cannot be understood as a limitation on the utility model.

[0026] In the description of the utility model, it needs to explain, unless otherwise expressly provided and limited, the term "installation", "connection", "communication" should be broad understanding, for example, it can be fixed connection, also can be detachable connection, or integrally connected;It can be mechanical connection, also can be electrical connection;It can be directly connected, also can be indirectly connected through the intermediate medium, it can be the communication inside two elements.For ordinary skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.

[0027] The following specific embodiments illustrate the embodiments of the utility model, the person skilled in the art can easily understand other advantages and effects of the utility model from the content disclosed in the specification, obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary skilled in the art without creative labor belong to the scope of protection of the utility model.

[0028] As Figure 1-8 A split type grinding tool for brake disc grinding machine, including grinding wheel 1, aluminum alloy ring 2 and steel cylinder 3, the grinding wheel 1 is fixedly connected to the one end surface of the aluminum alloy ring 2, the other end surface of the aluminum alloy ring 2 extends from its inner circle to form a convex ring 21, the aluminum alloy ring 2 is circumferentially arranged with multiple through holes 22 passing through the convex ring 21;Multiple screw holes 31 corresponding to the through hole 22 are formed on the one end surface of the steel cylinder 3, multiple screws 4 are screwed through the through hole 22 and the screw hole 31, and the one end surface of the steel cylinder 3 extends to the center to form a center hole 34 suitable for clamping. The combination structure of steel cylinder and aluminum alloy ring in the embodiment improves the overall strength, reduces the generation of dither in the processing process, and improves the appearance quality of the product.

[0029] The aluminum alloy ring 2 is still used because the thermal expansion coefficient of aluminum alloy is approximately 23.2×10^-6^ / ℃, which means that the length change rate of aluminum alloy is relatively high when the temperature changes. This higher thermal expansion coefficient allows the aluminum alloy substrate and the grinding wheel to better match when the temperature changes, reducing the internal stress caused by uneven thermal expansion, thereby reducing the risk of deformation and damage to the mold during use. Aluminum alloy has good thermal expansion properties and can maintain good dimensional stability during temperature changes. This is very important for molds because a large amount of heat is generated during the grinding process, and good thermal expansion properties can help reduce thermal stress caused by temperature changes. Thermal stress is one of the main causes of damage and failure of molds. The high thermal expansion coefficient of the aluminum alloy substrate helps reduce this stress and improve the durability and reliability of the mold.

[0030] Steel is used for the cylinder 3 because it possesses excellent tensile strength, elongation, and yield strength. This allows the cylinder 3 to withstand significant loads, ensuring the stability and safety of the mold during use. The cylindrical structure's geometric properties provide a high load-bearing capacity, particularly under axial compression and annular tension. The cylindrical structure offers excellent stability and is less susceptible to instability. Cylindrical structures typically use less material and are relatively simple to manufacture, which helps reduce costs.

[0031] In another preferred embodiment, the through hole 22 is expanded at the end fixed to the grinding wheel 1 to form a countersunk head 23, and the head of the screw 4 is embedded in the countersunk head 23. By embedding the head of the screw 4 in the countersunk head 23, the grinding capacity of the grinding wheel can be fully utilized until the grinding wheel is worn to the end surface of the aluminum alloy ring 2, thereby maximizing the use of grinding wheel material and reducing material waste.

[0032] In another preferred embodiment, the abutting surface of the steel cylinder 3 extends toward the inner circle of the aluminum alloy ring 2 to form a limiting ring 32, and the cross-section of the limiting ring 32 is formed into a right-angled trapezoid with a straight inner side and a slanted outer side, and the maximum outer diameter of the limiting ring 32 is equal to the inner diameter of the aluminum alloy ring 2. The design of the limiting ring 32 makes the fit between the steel cylinder 3 and the aluminum alloy ring 2 more precise, and the right-angled trapezoid structure with a straight inner side and a slanted outer side provides a clear guide to ensure the alignment between the two. Since the maximum outer diameter of the limiting ring 32 is equal to the inner diameter of the aluminum alloy ring 2, this design can ensure that during the assembly process, the steel cylinder 3 is automatically centered to the center position of the aluminum alloy ring 2, reducing the need for manual adjustment and improving the efficiency and accuracy of assembly. The structure of the limiting ring 32 helps to reduce errors during the assembly process because it limits the position of the steel cylinder 3 so that it can only move along a specific path until it reaches the correct centering position. The automatic centering design simplifies the assembly process. Operators no longer need to perform complex centering operations. They simply place the steel cylinder 3 onto the aluminum alloy ring 2, and the retaining ring 32 automatically guides it into the correct position. Automatic centering reduces assembly time and improves production efficiency, a particularly significant advantage in production lines requiring frequent mold changes.

[0033] In another preferred embodiment, the angle between the outer bevel and the bottom edge of the cross-section of the limiting ring 32 is 70° to 80°. The angle of 70° to 80° provides a moderate bevel for assembly, so that the steel cylinder 3 can more easily slide into the correct position along the bevel, thereby achieving quick assembly. This angle range helps to ensure that the steel cylinder 3 can automatically and accurately dock with the center of the aluminum alloy ring 2 during the assembly process, thereby improving the centering accuracy of the overall mold. This angle range can provide appropriate fitting force during assembly, which is neither too tight to make assembly difficult, nor too loose to make the fit unstable.

[0034] In another preferred embodiment, the root of the limit ring 32 is cleared to form an overrun groove 33. The overrun groove 33 provides additional space for assembly, ensuring that no interference between components occurs during the assembly process, especially when there is axial or radial displacement. The design of the overrun groove 33 makes the assembly process smoother because it provides sufficient space for components to avoid contact and obstruction with each other, thereby reducing the difficulty of assembly. By reducing assembly interference, the overrun groove 33 helps to reduce stress concentration and potential structural weaknesses caused by improper assembly, thereby improving the reliability and durability of the mold. The overrun groove 33 provides a certain degree of flexibility, allowing tolerance variations within a certain range, which is particularly important for mass production and assembly of components from different batches.

[0035] In another preferred embodiment, the thickness of the aluminum alloy ring 2 is at least 8 mm. The wall thickness of the steel cylinder 3 is at least 6 mm. The width of the convex ring 21 is 1.2 to 1.5 times the thickness of the aluminum alloy ring 2. The ratio of the diameter of the screw 4 to the diameter of the through hole 22 is 0.8:1 to 0.95:1. The number of the through holes 22 is an even number greater than 8. These design parameters are selected to improve the structural strength and stability of the mold, ensure that the mold can operate reliably under high load and high pressure working conditions, and reduce the risk of failure and damage.

[0036] Although the present invention has been described in detail above using general descriptions and specific embodiments, it will be apparent to those skilled in the art that modifications or improvements may be made to the present invention. Therefore, such modifications or improvements, without departing from the spirit of the present invention, are within the scope of protection claimed herein.

[0037] Any matters not described in detail in the present invention are prior art or common knowledge in the field.

Claims

1. A split grinding tool for a brake disc turning machine, comprising a grinding wheel (1), characterized in that: It also includes an aluminum alloy ring (2) and a steel cylinder (3), wherein the grinding wheel (1) is fixed to one end face of the aluminum alloy ring (2), and the other end face of the aluminum alloy ring (2) extends outward from its inner circle to form a convex ring (21), and the aluminum alloy ring (2) is provided with a plurality of through holes (22) in a circumferential array passing through the convex ring (21); a plurality of screw holes (31) corresponding to the through holes (22) are provided on one end face of the steel cylinder (3), and a plurality of screws (4) pass through the through holes (22) and are screwed to the screw holes (31), and one end face of the steel cylinder (3) extends toward the center to form a center hole (34) suitable for clamping.

2. A split grinding tool for a brake disc grinding machine according to claim 1, characterized in that: The through hole (22) is expanded at the end fixed to the grinding wheel (1) to form a countersunk head (23), and the nail head of the screw (4) is embedded in the countersunk head (23).

3. The split grinding tool for a brake disc grinding machine according to claim 1, characterized in that: The abutting surface of the steel cylinder (3) extends toward the inner circle of the aluminum alloy ring (2) to form a limiting ring (32). The cross section of the limiting ring (32) is formed into a right-angled trapezoid with a straight interior and an oblique exterior. The maximum outer diameter of the limiting ring (32) is equal to the inner diameter of the aluminum alloy ring (2).

4. The split grinding tool for a brake disc grinding machine according to claim 1, characterized in that: The included angle between the outer oblique side and the bottom side of the cross section of the limiting ring (32) is 70° to 80°.

5. The split grinding tool for a brake disc grinding machine according to claim 3, characterized in that: The root of the limiting ring (32) is cleared to form an overrun groove (33).

6. The split grinding tool for a brake disc grinding machine according to claim 1, characterized in that: The thickness of the aluminum alloy ring (2) is at least 8 mm.

7. The split grinding tool for a brake disc grinding machine according to claim 1, characterized in that: The wall thickness of the steel cylinder (3) is at least 6 mm.

8. The split grinding tool for a brake disc grinding machine according to claim 1, characterized in that: The width of the convex ring (21) is 1.2 to 1.5 times the thickness of the aluminum alloy circular ring (2).

9. The split grinding tool for a brake disc turning and grinding machine according to claim 1, characterized in that: The ratio of the diameter of the screw (4) to the diameter of the through hole (22) is 0.8:1 to 0.95:

1.

10. The split grinding tool for a brake disc turning and grinding machine according to claim 1, characterized in that: The number of the through holes (22) is an even number greater than 8.

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