A composite structure for reducing stress concentration tooth breakage of an elastic tooth grinding wheel

Abstract

This invention relates to a composite structure for reducing stress concentration and tooth breakage in elastic tooth grinding wheels, belonging to the field of grinding wheels. It includes: a frame, grinding elements, and a grinding wheel base. The frame is fixedly mounted on the grinding wheel base. Multiple grinding elements are circumferentially spaced within the frame. The grinding elements are inclined rearward along the grinding wheel's rotation direction. The portion of the frame in front of the grinding elements along the grinding wheel's rotation direction serves as a front stop to prevent the grinding elements from moving forward circumferentially under the centrifugal force of the rotating grinding wheel. A counterweight structure is provided on the front stop. This invention helps reduce the risk of stress concentration fracture.

Description

Technical Field

[0001] This invention relates to the field of grinding wheels, and more particularly to a composite structure for reducing stress concentration and tooth breakage in elastic tooth grinding wheels. Background Technology

[0002] An elastic toothed grinding wheel is formed by multiple grinding parts being fixed around the end face of the grinding wheel base near the outer diameter, creating a cup-shaped grinding wheel (also known as an end-face grinding wheel), or multiple grinding parts being fixed around the outer circumference of the grinding wheel base, creating a shaped grinding wheel (also known as a peripheral grinding wheel). The area between the working part of the grinding part and the mounting position is an elastic transition section made of elastic material (such as spring steel: 65Mn steel sheet, 301 stainless steel sheet). When the grinding part is set to be tilted backward circumferentially along the rotation direction, under the action of centrifugal force, the working part of the grinding part will be displaced circumferentially forward in the rotation direction. Thus, when the working section of the grinding part is in contact with the workpiece, it moves backward circumferentially, and when it is detached from the workpiece, it moves forward circumferentially. Therefore, when the elastic transition section and the working section of the grinding part are working, they exhibit a "swaying" situation circumferentially forward and backward. The grinding part is subjected to alternating bending stress, which easily leads to stress concentration fracture. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a composite structure that reduces stress concentration and tooth breakage in elastic tooth grinding wheels, so as to solve the above-mentioned problem.

[0004] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: A composite structure for reducing stress concentration and tooth breakage in elastic tooth grinding wheels includes: a skeleton, grinding parts, and a grinding wheel base. The skeleton is fixedly installed on the grinding wheel base. A plurality of grinding parts are circumferentially spaced in the skeleton. The grinding parts are inclined backward along the rotation direction of the grinding wheel. The skeleton portion in front of the grinding parts along the rotation direction of the grinding wheel is a front stop for preventing the grinding parts from moving forward circumferentially under the centrifugal force of the rotating grinding wheel. A counterweight structure is provided on the front stop.

[0005] The beneficial effects of this invention are: during grinding, the depth of cut for each grinding workpiece is very small, the grinding workpiece moves backward in a small circumferential direction due to force, and under the action of the front stop, the displacement of the grinding workpiece is converted from alternating stress amplitude to a small unidirectional pulsating stress amplitude, thereby greatly reducing the risk of stress concentration fracture.

[0006] Based on the above technical solution, the present invention can be further improved as follows.

[0007] Furthermore, the center of mass of the front bumper is located circumferentially forward of the centroid of the front bumper, which is used to form the counterweight structure.

[0008] The beneficial effects of adopting the above-mentioned further scheme are: it helps the front stop to have internal stress that moves backward along the circumference under the action of centrifugal force when the grinding wheel is unloaded, and it helps the front stop to resist the internal stress that moves forward along the circumference of the grinding workpiece when unloaded, so as to cooperate with the rigidity of the front stop to support the grinding workpiece and avoid the grinding workpiece moving forward along the circumference.

[0009] Furthermore, a counterweight hole is provided on the circumferential front portion of the front bumper, and the counterweight hole is filled with a material with a density greater than that of the front bumper.

[0010] The beneficial effect of adopting the above-mentioned further scheme is that it helps to place the center of mass of the front guard in a forward position circumferentially offset from the centroid along the rotation direction, thereby increasing the internal stress effect of the auxiliary front guard resisting the forward movement of the grinding workpiece along the circumference when unloaded.

[0011] Furthermore, the wear rate of the front bumper is higher than the wear rate of the grinding part.

[0012] The advantages of adopting the above-mentioned further solutions are: it facilitates the normal operation of the grinding workpiece and does not hinder the cooling of the cutting edge of the grinding workpiece by the cooling water.

[0013] Furthermore, a high-strength thermoplastic material is installed on the adjacent front guard sidewall in front of the grinding part along the rotation direction of the grinding wheel.

[0014] The beneficial effect of adopting the above-mentioned further solutions is that it helps to improve the local strength or elasticity of the front gear frame.

[0015] Furthermore, the front bumper is provided with a cooling groove, which is a radial through groove, and multiple cooling grooves are axially spaced apart, or the cooling groove is an axial through groove, and multiple cooling grooves are radially spaced apart.

[0016] The beneficial effect of adopting the above-mentioned further solution is that the cooling tank helps to provide a cooling water flow channel for cooling the cutting edge of the grinding workpiece on the grinding end face.

[0017] Furthermore, a gap is provided between the grinding part and the adjacent front stop behind it along the rotation direction of the grinding wheel, and the grinding part abuts against the adjacent front stop in front of it along the rotation direction of the grinding wheel.

[0018] The beneficial effects of adopting the above-mentioned further scheme are: it helps to rigidly support the grinding workpiece and its adjacent front support in front of it along the direction of rotation of the grinding wheel, ensuring that the grinding workpiece does not move forward along the circumference under the action of centrifugal force when unloaded; the gap between the grinding workpiece and its adjacent front support behind it along the direction of rotation of the grinding wheel is provided, which helps to ensure that the grinding workpiece is not restricted when it is subjected to elastic displacement during grinding, thus achieving the grinding performance of elastic grinding.

[0019] Furthermore, the skeleton is manufactured from thermoplastic material using an additive manufacturing process.

[0020] The beneficial effect of adopting the above-mentioned further solution is that it solves the problem of manufacturing complex structures where insert molding processes are difficult to implement.

[0021] Furthermore, the grinding part includes a grinding part substrate and a grinding layer, wherein the grinding layer is fixed on the side wall of the grinding part substrate in front of the grinding wheel rotation direction.

[0022] The beneficial effect of adopting the above-mentioned further scheme is that it helps the grinding workpiece substrate to provide support and elasticity required for the grinding process of the grinding layer.

[0023] Furthermore, the grinding workpiece substrate includes a working section, an elastic transition section, and a mounting section. The working section and the mounting section are respectively fixedly installed at both ends of the elastic transition section. The grinding layer includes diamond particles and a bonding agent. A plurality of diamond particles are circumferentially fixed in a single layer to the side wall of the working section in front of the grinding wheel rotation direction by the bonding agent.

[0024] The beneficial effects of adopting the above-mentioned further solution are: it helps to shorten the discharge path of diamond particles after they detach, and avoids the diamond particles after detachment from scratching or grooving the workpiece surface. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of the present invention; Figure 2 for Figure 1 Enlarged view of region A in the middle; Figure 3 The positional relationship between the centroid and the center of mass on the front bumper provided in the embodiments of the present invention Figure 1 ; Figure 4 This is a schematic diagram of the counterweight structure on the front gear frame provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of a cooling groove provided on a front bumper according to an embodiment of the present invention; Figure 6 The positional relationship between the centroid and the center of mass on the front bumper provided in the embodiments of the present invention Figure 2 ; Figure 7 A schematic diagram of a structure in which a high-strength thermoplastic material is disposed on a front gear frame according to an embodiment of the present invention; Figure 8 A side view of a front fender provided in an embodiment of the present invention, showing a high-strength thermoplastic material disposed thereon; Figure 9 This is a schematic diagram of the structure of the grinding part provided in an embodiment of the present invention.

[0026] in, Figure 1The arrow in the image indicates the direction of rotation of the grinding wheel. Figure 3 , Figure 6 and Figure 8 The arrow at the top center indicates the direction of rotation of the grinding wheel.

[0027] The attached diagram lists the components represented by each number as follows: 1. Skeleton; 2. Grinding part; 3. Grinding wheel base; 4. Front guard; 5. Clearance; 6. High-strength thermoplastic material; 21. Grinding part base; 22. Grinding layer; 41. Counterweight hole; 42. Cooling tank; 211. Working section; 212. Elastic transition section; 213. Mounting section; 221. Diamond particles; 222. Bonding agent. Detailed Implementation

[0028] The principles and features of the present invention are described below. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0029] like Figures 1 to 9 As shown, this embodiment provides a composite structure for reducing stress concentration and tooth breakage in elastic tooth grinding wheels, including: a frame 1, grinding parts 2, and a grinding wheel base 3. The frame 1 is fixedly installed on the grinding wheel base 3. A plurality of grinding parts 2 are circumferentially spaced in the frame 1. The grinding parts 2 are inclined backward along the rotation direction of the grinding wheel. The portion of the frame 1 in front of the grinding parts 2 along the rotation direction of the grinding wheel is a front stop 4 for preventing the grinding parts 2 from moving forward circumferentially under the centrifugal force of the rotating grinding wheel. The front stop 4 is provided with a counterweight structure.

[0030] It should be noted that in this embodiment, if the grinding wheel is a cup-shaped grinding wheel, the frame 1 is fixedly installed on the end face of the grinding wheel base 3; if the grinding wheel is an irregularly shaped grinding wheel, the frame 1 is fixedly installed on the outer circumferential surface of the grinding wheel base 3. "Avoiding the grinding part 2 from moving forward along the circumference" does not mean that the displacement of the grinding part 2 moving forward along the circumference is zero, but rather that it is a very small amount that is close to zero. The skeleton 1 can be selected as a whole ring or a segmented ring; The simple front bumper 4 can also be manufactured using injection molding.

[0031] The beneficial effects of this embodiment are: during grinding, the depth of cut for each grinding workpiece is very small, the force causes the grinding workpiece to move backward in a small circumferential direction, and under the action of the front stop, the displacement of the grinding workpiece is converted from an alternating stress amplitude to a small unidirectional pulsating stress amplitude, thereby greatly reducing the risk of stress concentration fracture.

[0032] Preferred, such as Figure 3 As shown, the center of mass of the front bumper 4 is located circumferentially forward of the centroid of the front bumper 4, and is used to form the counterweight structure.

[0033] It should be noted that, in this embodiment, the explanation of internal stress is as follows: Internal stress is the interaction force between adjacent parts inside an object. According to Newton's third law, a pair of forces act in opposite directions. When an object rotates around its central axis, if its center of mass is in front of the direction of rotation (i.e., ahead tangentially), the tangential (circumferential) internal stress inside the object generally points backward (opposite to the direction of rotation). The reason is that the mass at the center of mass is relatively large, and the centrifugal force is also relatively large. It will "try" to move forward tangentially, but it is pulled back by the internal force of the rear of the object. This dragging effect causes the material in front of the center of mass to be subjected to backward tangential stress, while the material behind it is subjected to forward stress. Therefore, in the region in front of the center of mass, the direction of internal stress is backward. Simply put, the center of mass "runs" in front and is pulled behind, so the internal stress in front of it is backward.

[0034] The advantages of adopting the above-mentioned preferred scheme are: it helps the front guard to have internal stress that moves backward along the circumference when the grinding wheel is unloaded under the action of centrifugal force, and it helps the front guard to resist the internal stress that moves forward along the circumference of the grinding workpiece when unloaded, so as to cooperate with the rigidity of the front guard to support the grinding workpiece and avoid the grinding workpiece from moving forward along the circumference.

[0035] Preferred, such as Figure 4 As shown, the front bumper 4 has a counterweight hole 41 on its circumferential front portion, and the counterweight hole 41 is filled with a material with a density greater than that of the front bumper 4.

[0036] It should be noted that in this embodiment, the front bumper 4 is made of thermoplastic material, and the filler in the counterweight hole 41 is a mixture of glue and iron powder.

[0037] The advantages of adopting the above-mentioned preferred scheme are: it helps to place the center of mass of the front guard in a forward position circumferentially offset from the centroid along the rotation direction, thereby increasing the internal stress effect of the auxiliary front guard resisting the forward movement of the grinding workpiece along the circumference when unloaded.

[0038] Preferred, such as Figure 2 As shown, the wear rate of the front bumper 4 is higher than that of the grinding part 2.

[0039] The advantages of adopting the above preferred solution are: it facilitates the normal operation of the grinding workpiece and does not hinder the cooling of the cutting edge of the grinding workpiece by the cooling water.

[0040] Preferred, such as Figure 7 and Figure 8 As shown, a high-strength thermoplastic material 6 is installed on the side wall of the adjacent front guard 4 in front of the grinding part 2 along the rotation direction of the grinding wheel.

[0041] It should be noted that, in this embodiment, the "high-strength thermoplastic material" has the following characteristics: thermoplastic (softens upon heating, solidifies upon cooling, and can be repeatedly processed), high strength (tensile strength is typically ≥80MPa, and can reach 200–600MPa after reinforcement), and high heat resistance (long-term service temperature ≥150℃). The beneficial effect of adopting the above preferred solution is that it helps to improve the local strength or elasticity of the front bumper.

[0042] Preferred, such as Figure 5 and Figure 6 As shown, the front bumper 4 is provided with a cooling groove 42. The cooling groove 42 is a radial through groove, and multiple cooling grooves 42 are axially spaced apart, or the cooling groove 42 is an axial through groove, and multiple cooling grooves 42 are radially spaced apart.

[0043] It should be noted that in this embodiment, if the grinding wheel is a cup-shaped grinding wheel, the cooling groove 42 is a radial through groove, and multiple cooling grooves 42 are axially spaced apart; if the grinding wheel is a non-circular grinding wheel, the cooling groove 42 is an axial through groove, and multiple cooling grooves 42 are radially spaced apart.

[0044] The advantages of adopting the above preferred solution are: the cooling tank helps to provide a cooling water flow channel for cooling the cutting edge of the grinding workpiece on the grinding end face.

[0045] Preferred, such as Figure 2 As shown, a gap 5 is provided between the grinding part 2 and the adjacent front stop 4 behind it along the rotation direction of the grinding wheel, and the grinding part 2 abuts against the adjacent front stop 4 in front of it along the rotation direction of the grinding wheel.

[0046] The advantages of adopting the above-mentioned preferred scheme are: it helps to rigidly support the grinding workpiece and its adjacent front support in front of it along the rotation direction of the grinding wheel, ensuring that the grinding workpiece does not move forward along the circumference under the action of centrifugal force when unloaded; the gap between the grinding workpiece and its adjacent front support behind it along the rotation direction of the grinding wheel helps to ensure that the grinding workpiece is not restricted when it is subjected to elastic displacement during grinding, thus achieving the grinding performance of elastic grinding.

[0047] Preferably, the skeleton 1 is manufactured from thermoplastic material using an additive manufacturing process.

[0048] The beneficial effect of adopting the above-mentioned preferred solution is that it solves the problem of manufacturing complex structures where insert molding processes are difficult to implement.

[0049] Preferred, such as Figure 9 As shown, the grinding part 2 includes a grinding part base 21 and a grinding layer 22, wherein the grinding layer 22 is fixed on the side wall of the grinding part base 21 in front of the grinding wheel rotation direction.

[0050] The advantages of adopting the above preferred scheme are: it helps the grinding workpiece substrate to provide support and elasticity required for the grinding force of the grinding layer during the grinding process.

[0051] Preferred, such as Figure 9 As shown, the grinding substrate 21 includes a working section 211, an elastic transition section 212, and a mounting section 213. The working section 211 and the mounting section 213 are respectively fixedly mounted at both ends of the elastic transition section 212. The grinding layer 22 includes diamond particles 221 and a binder 222. A plurality of diamond particles 221 are circumferentially fixed in a single layer by the binder 222 on the side wall of the working section 211 in front of the grinding wheel rotation direction.

[0052] It should be noted that in this embodiment, the elastic transition section 212 is made of an elastic material, such as spring steel 65Mn sheet or 301 stainless steel.

[0053] The advantages of adopting the above preferred solution are: it helps to shorten the discharge path of diamond particles after they detach, and avoids the diamond particles after detachment from scratching or grooving the workpiece surface.

[0054] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to 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 invention.

[0055] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0056] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0057] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0058] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0059] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A composite structure for reducing stress concentration and tooth breakage in elastic tooth grinding wheels, characterized in that, include: The frame (1), grinding parts (2) and grinding wheel base (3) are provided. The frame (1) is fixedly installed on the grinding wheel base (3). Multiple grinding parts (2) are circumferentially spaced in the frame (1). The grinding parts (2) are inclined backward along the rotation direction of the grinding wheel. The part of the frame (1) in front of the grinding parts (2) along the rotation direction of the grinding wheel is a front guard (4) to prevent the grinding parts (2) from moving forward along the circumference under the centrifugal force of the grinding wheel rotation. The front guard (4) is provided with a counterweight structure.

2. The composite structure for reducing stress concentration and tooth breakage in elastic tooth grinding wheels according to claim 1, characterized in that, The center of mass of the front bumper (4) is located circumferentially forward of the centroid of the front bumper (4), and is used to form the counterweight structure.

3. The composite structure for reducing stress concentration and tooth breakage in elastic tooth grinding wheels according to claim 2, characterized in that, The front bumper (4) has a counterweight hole (41) on its circumferential front portion, and the counterweight hole (41) is filled with a material with a density greater than that of the front bumper (4).

4. The composite structure for reducing stress concentration and tooth breakage in elastic tooth grinding wheels according to claim 1, characterized in that, The wear rate of the front bumper (4) is higher than that of the grinding part (2).

5. The composite structure for reducing stress concentration and tooth breakage in elastic tooth grinding wheels according to claim 1, characterized in that, A high-strength thermoplastic material (6) is installed on the side wall of the adjacent front guard (4) in front of the grinding part (2) along the rotation direction of the grinding wheel.

6. The composite structure for reducing stress concentration and tooth breakage in elastic tooth grinding wheels according to claim 1, characterized in that, The front frame (4) is provided with a cooling groove (42), which is a radial through groove. Multiple cooling grooves (42) are arranged axially spaced, or the cooling groove (42) is an axial through groove and multiple cooling grooves (42) are arranged radially spaced.

7. The composite structure for reducing stress concentration and tooth breakage in elastic tooth grinding wheels according to claim 1, characterized in that, A gap (5) is provided between the grinding part (2) and the adjacent front stop (4) behind it along the rotation direction of the grinding wheel, and the grinding part (2) abuts against the adjacent front stop (4) in front of it along the rotation direction of the grinding wheel.

8. The composite structure for reducing stress concentration and tooth breakage in elastic tooth grinding wheels according to claim 1, characterized in that, The skeleton (1) is made of thermoplastic material through additive manufacturing process.

9. The composite structure for reducing stress concentration and tooth breakage in elastic tooth grinding wheels according to claim 1, characterized in that, The grinding part (2) includes a grinding part base (21) and a grinding layer (22), wherein the grinding layer (22) is fixed on the side wall in front of the grinding part base (21) along the rotation direction of the grinding wheel.

10. The composite structure for reducing stress concentration and tooth breakage in elastic tooth grinding wheels according to claim 9, characterized in that, The grinding substrate (21) includes a working section (211), an elastic transition section (212), and a mounting section (213). The working section (211) and the mounting section (213) are respectively fixedly mounted at both ends of the elastic transition section (212). The grinding layer (22) includes diamond particles (221) and a binder (222). A plurality of diamond particles (221) are circumferentially fixed in a single layer by the binder (222) on the side wall in front of the working section (211) along the direction of the grinding wheel rotation.

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