A novel CBN oilstone and its processing and application methods

Abstract

This application discloses a novel CBN honing stone and its processing and application methods, relating to the technical field of honing stones. A novel CBN honing stone includes an abrasive tool and a connecting rod. One end of the abrasive tool is an arc-shaped machining end for honing raceways, and the other end is a first connecting end. One end of the connecting rod is a second connecting end, and the first connecting end and the second connecting end are connected. The abrasive tool includes a central first honing portion and a second honing portion surrounding the first honing portion, which are connected. The thickness of the first honing portion along the length of the connecting rod is less than the thickness of the second honing portion along the length of the connecting rod. This application also discloses a processing method for the novel CBN honing stone and a method for using the novel CBN honing stone. This application can change the location of defects on the raceway surface, thereby facilitating timely observation of defects and enabling timely replacement of the honing stone.

Description

Technical Field

[0001] This application relates to the technical field of oilstones, and in particular to a novel CBN oilstone and its processing and application methods. Background Technology

[0002] Oilstones are a type of oil-rich rock, typically classified into six types based on their material composition: green silicon carbide, white corundum, brown corundum, boron carbide, ruby, and natural jade. Oilstones are naturally black or brownish-black and do not appear oily on the surface. However, during hot gas distillation, the organic matter within them decomposes into kerosene, hence the name. They are fine-grained and tough, and are commonly used as abrasives. Currently, bonded abrasives made with binders and abrasives are also often referred to as oilstones. CBN (cubic boron nitride) oilstones are one type of oilstone mentioned above. CBN oilstones are widely used in bearing honing, and a connecting rod is installed at the end of the bonded abrasive to facilitate grinding at designated locations on the bearing.

[0003] A CBN oilstone is currently disclosed, which includes a bonded abrasive and a cuboid connecting rod. The connecting rod includes a first bonding end at one end, and the bonded abrasive includes a second bonding end at the other end. The end face of the second bonding end is flat, and the first bonding end is bonded and fixed to the second bonding end with adhesive. The bonded abrasive also includes an arc end away from the connecting rod, which is used to grind the raceway of the bearing.

[0004] In the aforementioned related technologies, as the honing process of the arc end proceeds, the bonded abrasive structure is continuously worn away, resulting in the overall structure of the bonded abrasive becoming shorter and shorter. The edge structure of the first bonded end will be exposed first, which may cause the edge structure of the first bonded end to come into contact with the honing surface of the bearing raceway. The edge structure of the first bonded end may participate in the honing. However, even if the first bonded end participates in the honing, the grinding of the bearing raceway surface can still continue. However, the edge structure of the first bonded end will occasionally scrape against the side wall of the raceway as the honing progresses, thus forming surface defects. The non-continuous scraping causes the abnormal defects on the surface to be small and difficult to observe in the early stages. Only when the area of ​​abnormal defects on the raceway surface increases due to the further use of the bonded abrasive can they be easily observed. The large area of ​​abnormal defects caused by the scraping will lead to a decrease in the processing effect of the machined surface, such as a decrease in roughness, which will intensify the vibration during operation after the bearing is assembled, affecting the bearing's life performance and service performance. Summary of the Invention

[0005] In order to change the location of defects on the raceway surface so as to facilitate timely observation of defects and timely replacement of the oilstone, this application provides a novel CBN oilstone and its processing and usage methods.

[0006] Firstly, the aforementioned objective of this invention is achieved through the following technical solution:

[0007] A novel CBN honing stone includes an abrasive tool and a connecting rod. One end of the abrasive tool is an arc-shaped machining end for honing raceways, and the other end is a first connecting end. One end of the connecting rod is a second connecting end, and the first connecting end and the second connecting end are connected. The abrasive tool includes a first honing portion in the middle and a second honing portion surrounding the first honing portion. The first honing portion and the second honing portion are connected. The thickness of the first honing portion in the length direction of the connecting rod is less than the thickness of the second honing portion in the length direction of the connecting rod.

[0008] By adopting the above technical solution, the connecting rod makes it easier for the grinding wheel to hone the raceway surface. After the grinding wheel has been honeed for a long time and the overall structure of the grinding wheel becomes shorter and shorter, the middle part of the first honing section is less than the thickness of the second honing section on the outside in the same direction. Therefore, the middle part of the connecting rod will be exposed first and participate in the honing. At this time, the location of the defects on the raceway surface is changed to the bottom wall of the raceway. Since the exposed connecting rod structure is always involved in the honing, the defects on the raceway will form quickly. As the honing stone swings, the defects will quickly spread to the entire bottom wall of the raceway. The defects are easy to observe and the honing stone can be replaced in time.

[0009] Preferably, the end faces of the first connecting end and the second connecting end are in contact with each other, and both the end faces of the first connecting end and the second connecting end are curved surfaces.

[0010] Preferably, the projection of the first connecting end in the thickness direction of the connecting rod has a first arc, and the projection of the arc-processed end in the thickness direction of the connecting rod has a second arc, wherein the radius of curvature of the second arc is greater than the radius of curvature of the first arc.

[0011] By adopting the above technical solution, the middle position of the second connecting end is exposed first and participates in the honing of the raceway.

[0012] Preferably, the first connecting end is adhered to the second connecting end.

[0013] By adopting the above technical solution, the stability of the connection between the first connection end and the second connection end can be guaranteed.

[0014] Preferably, the connecting rod is an extended square rod.

[0015] Preferably, the first honing part is located at the center of the connecting rod.

[0016] Secondly, the above-mentioned objective of this invention is achieved through the following technical solution:

[0017] A processing method for the novel CBN oilstone includes the following steps:

[0018] S1. Artificially manufacture an oilstone blank, divide the oilstone blank into multiple grinding molds, and prepare the same number of connecting rods as the grinding molds;

[0019] S2. Use a wavy cutting tool to process multiple grinding wheels and multiple connecting rods simultaneously. A circular arc machining end and a second connecting end are machined on each grinding wheel, and a second connecting end is machined on each connecting rod.

[0020] S3. Use glue to attach the second connecting end to the first connecting end.

[0021] By adopting the above technical solution, after preparing the same number of grinding wheels and connecting rods, the wavy cutting tool can efficiently process the arc-shaped machining end and the second connecting end on the grinding wheel and connecting rod. Furthermore, the wavy cutting tool can process multiple grinding wheels and multiple connecting rods at the same time.

[0022] Preferably, in step S2, natural stone can also be used as the initial rough stone.

[0023] Thirdly, the above-mentioned objective three of this invention is achieved through the following technical solutions:

[0024] A method of using the novel CBN oilstone includes the following steps:

[0025] S1. When the grinding wheel is honing the raceway, a distance sensor is used to monitor the amount of grinding wheel used in real time.

[0026] S2. Based on the data obtained by the distance sensor, determine whether the grinding wheel is about to be finished. When the grinding wheel is about to be finished, pay close attention to whether there are any processing defects on the raceway surface.

[0027] S3. When machining defects appear on the raceway surface, stop the honing of the raceway by the grinding wheel.

[0028] By adopting the above technical solution, the distance sensor can detect the amount of grinding material removed in real time, thereby determining how much length of grinding material remains to be ground. When it is determined that the grinding material is about to be ground to completion, the honing of the raceway can be stopped by constantly observing whether machining defects have formed on the raceway surface. The above method can minimize the waste of grinding material and thus reduce costs.

[0029] In summary, the present invention has at least one of the following beneficial technical effects:

[0030] 1. The connecting rod facilitates the honing of the raceway surface by the grinding wheel. As the grinding wheel becomes shorter due to prolonged honing, the thickness of the first honing part in the middle along the length of the connecting rod is less than that of the second honing part on the outer side. Therefore, the middle part of the connecting rod will be exposed first and participate in the honing. At this time, the location of defects on the raceway surface is changed to the bottom wall of the raceway. Since the exposed connecting rod structure is always involved in honing, defects on the raceway will form quickly. As the honing stone swings, the defects will quickly spread to the entire bottom wall of the raceway. The defects are easy to observe, and the honing stone can be replaced in time.

[0031] 2. After preparing the same number of grinding wheels and connecting rods, the use of a wavy cutter can efficiently machine the arc-shaped machining end and the second connecting end on the grinding wheel and connecting rod. Furthermore, the wavy cutter can process multiple grinding wheels and multiple connecting rods at the same time.

[0032] 3. Based on the distance sensor, the amount of grinding material removed by the grinding wheel can be detected in real time, thereby determining how much length of the grinding wheel remains to be ground. When it is determined that the grinding wheel is about to be finished, the grinding wheel can be stopped by constantly observing whether machining defects have formed on the surface of the raceway. The above method can minimize the waste of the grinding wheel and thus reduce costs. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall structure of a novel CBN oilstone in an embodiment of this application;

[0034] Figure 2 This is an exploded view of a novel CBN oilstone in an embodiment of this application;

[0035] Figure 3 This is a top view of a new type of CBN oilstone;

[0036] Figure 4 This is a structural diagram used to illustrate the structure of the wave-shaped cutting tool.

[0037] In the attached diagram, the following markings are used: 1. Grinding tool; 11. Arc machining end; 12. First connecting end; 13. First honing part; 14. Second honing part; 2. Connecting rod; 21. Second connecting end; 3. Tool body; 31. First wavy cutting edge; 311. First arc groove; 32. Second wavy cutting edge; 321. Second arc groove;

[0038] a) First arc; b) Second arc. Detailed Implementation

[0039] The present invention will be further described in detail below with reference to the accompanying drawings.

[0040] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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 limiting this invention.

[0041] This application discloses a novel CBN oilstone. It is used to alter the location of defects on the raceway surface, thereby facilitating timely observation of defects and enabling prompt replacement of the oilstone.

[0042] Reference Figure 1 and Figure 2 A novel CBN honing stone includes a grinding wheel 1 and a connecting rod 2. The grinding wheel 1 is a quadrangular prism, and the connecting rod 2 is a connecting square rod. The upper end of the grinding wheel 1 is an arc-shaped machining end 11 for honing the raceway, and the lower end is a first connecting end 12. The upper end of the connecting rod 2 is a second connecting end 21. The first connecting end 12 and the second connecting end 21 are connected. The connecting rod 2 makes it easy to insert the grinding wheel 1 into the raceway to hone the raceway surface.

[0043] In this embodiment, honing is mainly used for finishing. After the raceway on the bearing is initially shaped, the raceway is finished by using external equipment, such as a honing machine, to clamp the CBN oilstone and hone the raceway, thereby reducing the surface roughness of the raceway and ensuring that the various dimensions of the raceway meet the processing requirements.

[0044] Reference Figure 1 and Figure 2 Specifically, in this embodiment, the first connecting end 12 is glued to the second connecting end 21, and the end faces of the first connecting end 12 and the second connecting end 21 are in contact with each other. Both the end faces of the first connecting end 12 and the second connecting end 21 are curved surfaces. In other embodiments, the projections of the end faces of the first connecting end 12 and the end faces of the second connecting end 21 onto the horizontal plane can also be trapezoids, triangles, or other shapes.

[0045] Reference Figure 2 and Figure 3 The abrasive tool 1 includes a first honing portion 13 in the middle and a second honing portion 14 surrounding the first honing portion 13. The first honing portion 13 is located at the center of the connecting rod 2. The first honing portion 13 and the second honing portion 14 are connected and are integral parts. The vertical thickness of the first honing portion 13 is less than the vertical thickness of the second honing portion 14. Specifically, the projection of the first connecting end 12 on the horizontal plane has a first arc a, and the projection of the arc-processed end 11 on the horizontal plane has a second arc b. The radius of curvature of the second arc b is greater than the radius of curvature of the first arc a.

[0046] After the grinding wheel 1 is honed for a long time, causing the overall structure of the grinding wheel 1 to become shorter and shorter in the vertical direction, the structure in the middle position of the second connecting end 21 will be exposed first and participate in the honing because the thickness of the first honing part 13 in the middle is less than the thickness of the second honing part 14 in the outer direction. Compared with the case where the edge of the connecting rod 2 is exposed first in the prior art, the location of the defect on the raceway surface is changed from the side wall of the raceway to the bottom wall of the raceway. The exposed structure of the connecting rod 2 always participates in the honing, so the defect on the raceway will form quickly. As the honing stone swings, the defect will spread rapidly to the entire bottom wall of the raceway. The defect is easy for workers to observe or for machines to detect, and the honing stone can be replaced in time to avoid further spread of the defect.

[0047] The reason for making the radius of curvature of the second arc b greater than that of the first arc a is to avoid the upper end of the connecting rod 2 being fully exposed to participate in honing, as this would result in a larger defect area on the raceway surface.

[0048] The implementation principle of a novel CBN honing stone in this application embodiment is as follows: the grinding tool 1 is inserted into the raceway to continuously hone the raceway surface, thereby making the thickness of the grinding tool 1 continuously decrease in the vertical direction. The continuous honing action continues until the middle part of the upper end of the connecting rod 2 is exposed to participate in the honing. At this time, an easily observable defect is generated on the bottom wall of the raceway surface. After the defect is observed to have formed, the honing stone is replaced.

[0049] This application also discloses a novel method for processing CBN oilstone, comprising the following steps:

[0050] S1. Prepare the initial oilstone blank, use a cutting machine to divide the initial oilstone blank into multiple molds 1 of the same size, and prepare the same number of connecting rods 2 as the molds 1.

[0051] The oilstone blank can be artificially manufactured using a binder and abrasive, or it can be made from natural boron nitride stone. In this embodiment, the abrasive 1 obtained by cutting is a quadrangular prism, and the connecting rod 2 is also a quadrangular prism, with the cross-sectional size of the connecting rod 2 being the same as that of the abrasive 1.

[0052] S2. Using external equipment such as a stamping machine to clamp a wave-shaped cutting tool, multiple molds 1 and multiple connecting rods 2 are processed simultaneously. A circular arc processing end 11 and a second connecting end 21 are processed on each mold 1, and a second connecting end 21 is processed on each connecting rod 2.

[0053] Reference Figure 4The wavy cutting tool includes a blade body 3, one end of which is a first wavy cutting edge 31, and the other end is a second wavy cutting edge 32. The first wavy cutting edge 31 has multiple first arc-shaped grooves 311, combined with... Figure 2 The projection size of the first arc-shaped groove 311 on the horizontal line is the same as the projection size of the arc-shaped processing end 11 on the horizontal line; the second wave-shaped cutting edge 32 forms a plurality of second arc-shaped grooves 321, and the projection size of the second arc-shaped grooves 321 on the horizontal line is the same as the projection size of the second connecting end 21 on the horizontal line.

[0054] In addition, for most bearing models, the arc surface requirement of the grinding wheel is the same, so the same wavy tool can be reused, which can reduce costs.

[0055] S3. Use glue to attach the second connecting end 21 to the first connecting end 12, and make sure that the second connecting end 21 and the first connecting end 12 are in close contact to obtain the finished product.

[0056] This application also discloses a novel method for using CBN oilstone, including the following steps:

[0057] S1. When the grinding wheel 1 is honing the raceway, a distance sensor is used to monitor the amount of grinding wheel 1 used in real time.

[0058] S2. Based on the data obtained by the distance sensor, determine whether the grinding mold 1 is about to be finished. When the grinding mold 1 is about to be finished, pay close attention to whether there are any processing defects on the raceway surface.

[0059] S3. When machining defects appear on the raceway surface, stop honing the raceway with grinding wheel 1, and then replace it with a CBN oilstone.

[0060] Currently, the grinding wheel 1 has different lengths depending on the specific requirements. The wear rate of the grinding wheel 1 also varies depending on the model, material, initial surface roughness, and equipment parameters used in the machining process. In this application, a distance sensor can be mounted on the connecting rod 2. During the honing of the raceway by the grinding wheel 1, the distance sensor can detect the distance between itself and the raceway in real time. Based on this, the amount of grinding wheel 1 worn away and the remaining amount can be calculated. When it is determined that the grinding wheel 1 is about to be completely ground, the honing of the raceway can be stopped by constantly observing whether machining defects have formed on the raceway surface. This method minimizes the waste of the grinding wheel 1, resulting in a smaller amount of grinding wheel 1 remaining on the extension rod, thereby reducing costs.

[0061] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A novel CBN oilstone, characterized in that: The assembly includes a grinding wheel (1) and a connecting rod (2). One end of the grinding wheel (1) is an outwardly protruding arc-shaped machining end (11) for honing the raceway, and the other end is a first connecting end (12). One end of the connecting rod (2) is a second connecting end (21), and the first connecting end (12) and the second connecting end (21) are connected. The grinding wheel (1) includes a first honing part (13) in the middle and a second honing part (14) surrounding the first honing part (13). The first honing part (13) and the second honing part (14) are connected. The thickness of the first honing part (13) in the length direction of the connecting rod (2) is less than the thickness of the second honing part (14) in the length direction of the connecting rod (2). The end face of the first connecting end (12) and the end face of the second connecting end (21) are in contact with each other, and both the end faces of the first connecting end (12) and the second connecting end (21) are curved surfaces.

2. The novel CBN oilstone according to claim 1, characterized in that: The projection of the first connecting end (12) in the thickness direction of the connecting rod (2) has a first arc (a), and the projection of the arc-processed end (11) in the thickness direction of the connecting rod (2) has a second arc (b), the radius of curvature of the second arc (b) being greater than the radius of curvature of the first arc (a).

3. The novel CBN oilstone according to claim 1, characterized in that: The first connecting end (12) is attached to the second connecting end (21).

4. The novel CBN oilstone according to claim 1, characterized in that: The connecting rod (2) is an extended square rod.

5. A novel CBN oilstone according to claim 1, characterized in that: The first honing part (13) is located at the center of the connecting rod (2).

6. A processing method for the novel CBN oilstone according to any one of claims 1-5, characterized in that: Includes the following steps: S1. Artificially manufacture an oilstone blank, divide the oilstone blank into multiple grinding tools (1), and prepare the same number of connecting rods (2) as the grinding tools (1); S2. Use a wave-shaped tool to process multiple grinding wheels (1) and multiple connecting rods (2) simultaneously. A circular arc processing end (11) and a first connecting end (12) are processed on each grinding wheel (1), and a second connecting end (21) is processed on each connecting rod (2). S3. Use glue to attach the second connecting end (21) to the first connecting end (12).

7. The processing method of the novel CBN oilstone according to claim 6, characterized in that: In step S1, natural stone can also be used as the initial rough stone.

8. A method for honing raceways, characterized in that: The method of using the novel CBN oilstone as described in any one of claims 1-5 includes the following steps: S1. When the grinding wheel (1) is honing the raceway, a distance sensor is used to monitor the amount of grinding wheel (1) used in real time. S2. Based on the data obtained by the distance sensor, determine whether the grinding wheel (1) is about to be finished. When the grinding wheel (1) is about to be finished, pay attention to whether there are any processing defects on the raceway surface. S3. When machining defects appear on the raceway surface, stop the honing of the raceway by the abrasive tool (1).

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