Bearing information marking method and application thereof

Abstract

The invention relates to a method for marking information on a large rolling bearing. The outer diameter of the bearing is more than 200mm, and the bearing comprises an inner ring, an outer ring and at least one row of rolling bodies arranged between the inner ring and the outer ring. The method comprises the following steps of: 1) forming a non-load bearing surface which does not bear the running load of the bearing on an inner ring and / or an outer ring before the finished product stage of the inner ring and / or the outer ring, wherein the non-load bearing surface comprises a marking area which can accommodate characters with the height of over 2mm and can be used for marking information; and (2) marking the information in the marking area. On the basis of the method, the invention further provides the large rolling bearing, and the information marked according to the method is marked on the large rolling bearing.

Description

Technical Field

[0001] The invention relates to a method for marking information on a large rolling bearing and a large rolling bearing marked with information using the method. Background Art

[0002] Bearing information, including LOGO, model, code, date, etc., can be marked on different parts of the bearing, such as the inner ring, outer ring, cage, seal, dust cover, etc., through laser irradiation, pneumatic grinding, etc. Among them, the cage is located inside the bearing and has poor surface visibility, while the seal and dust cover are consumable parts and are easily discarded with replacement. Therefore, marking information on these parts is not the best choice. In addition, the surfaces of the inner and outer rings, including the inner and outer radial surfaces (referred to as "inner and outer diameter surfaces") and the axial end faces (referred to as "end faces"), are load-bearing surfaces in most cases. The information marked on these surfaces is easily worn out, which will make identification and tracking difficult. Therefore, marking information on the load-bearing surface of the bearing is not allowed.

[0003] The above limitations lead to the dilemma that bearing information is often nowhere to be found. Figure 1 A schematic diagram of an existing method for marking information by opening an information groove on the outer ring of a bearing at the finished product stage. This method requires that the information groove be formed on the end face of the outer ring at the finished product stage. This means that the finished outer ring needs to be transported from the finished product workshop to the milling workshop, where the information groove is processed, and then transported to the marking equipment (e.g., a laser marking machine) to engrave the mark. Considering that these bearing rings are finished rings of large bearings (with an outer diameter between 200 and 2200 mm), it is inconvenient to transport and process them, and they are prone to collision damage. For this reason, the applicant has also considered forming the information groove in the soft cutting stage before the heat treatment process to avoid the inconvenience and risk of processing the information groove at the finished product stage. However, for the purpose of protecting the load-bearing surface (outer ring end face), the depth of the information groove is usually limited, generally only 0.2 to 0.5 mm. In the case where the heat treatment process causes the overall deformation of the bearing ring, such a shallow groove is difficult to retain in the subsequent hard cutting process.

[0004] The above method of marking information by processing information grooves in the finished product stage has many disadvantages, and reality calls for a convenient and effective bearing information marking method. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a method for marking information on a large rolling bearing, wherein the bearing has an outer diameter of more than 200 mm, comprises an inner ring, an outer ring, and at least one row of rolling elements arranged between the inner ring and the outer ring. The method comprises the following sequential steps: 1) forming a non-load bearing surface that does not bear the operating load of the bearing on the inner ring and / or the outer ring before the finished product stage, wherein the non-load bearing surface comprises a marking area for marking information that can accommodate characters with a height of more than 2 mm; and 2) marking the information in the marking area.

[0006] Based on the above method, the present invention also provides a large rolling bearing marked with bearing information marked by the above method.

[0007] Since the information marking area is located on the non-load-bearing surface of the bearing, there is little risk of being worn out by the bearing operation load, so it can be preserved for a long time while meeting the practical need of being identifiable by the naked eye.

[0008] Various embodiments and beneficial technical effects of the present invention are described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 A schematic diagram showing a conventional method of marking bearing information by opening an information groove on the end face of an outer ring at the finished product stage;

[0010] Figure 2 A schematic diagram showing a method of forming a marking area at the bottom of an outer ring lubrication groove;

[0011] Figure 3 show Figure 2 A magnified view of the partial cross section of the middle and outer rings;

[0012] Figure 4 A schematic diagram showing a method of forming a marking area in a groove on an inner ring end surface;

[0013] Figure 5 A schematic diagram showing a method of forming a marking area on the chamfer of an inner ring end surface; and

[0014] Figure 6 show Figure 5 Enlarged partial cross-section of the middle inner ring. DETAILED DESCRIPTION

[0015] In the following description, the same or similar reference numerals are always used to indicate the same or similar components. In addition, the terms indicating directions, such as "axial", "radial" and "circumferential direction", refer to the axial, radial and circumferential directions of the components being described unless otherwise limited or specified.

[0016] In order to avoid the inconvenience caused by processing information grooves on finished bearing rings, the present invention chooses to find a roughly flat marking area on the non-load-bearing surface of the finished bearing ring for marking information, and marks the information related to the bearing in these marking areas. Here, the "finished bearing ring" refers to the bearing ring on which the structural processing has been fully implemented, which corresponds to the "finished product stage of the bearing ring" in time. The marking area needs to meet the following three conditions: first, the structural processing must have been completed before the finished product stage of the bearing ring (time condition); second, it must be located on the non-load-bearing surface of the finished bearing ring (position condition); third, it must be able to accommodate characters with a height of more than 2 mm (preferably 4 mm) and be flat enough to be suitable for marking information (size condition). Among them, the time condition means that there is no need to perform any mechanical processing on the structure of the bearing ring at the finished product stage, so the various inconveniences described in the "background technology" can be avoided; the position condition means that the marking area does not bear the operating load of the bearing, so the information marked therein is not easy to be worn; the size condition means that the marking area can accommodate characters of sufficient size and is easy to be found and identified.

[0017] As a specific implementation method, Figure 2 and 3 A schematic diagram showing a method of forming a marked area in a lubrication groove on a bearing outer ring. The figure takes a roller bearing used in a rolling (steel) mill as an example, showing that a concave annular lubrication groove is formed on the outer diameter surface of the double-row bearing outer ring. The lubrication groove has a plurality of lubrication holes spaced apart in the circumferential direction at its bottom, which are used to inject lubricant into the bearing when it is running and / or to keep the lubricant flowing inside and outside the bearing. Figure 2 It is most clearly shown that a roughly flat strip area is formed between two adjacent lubrication holes, which can be used to mark bearing information. Since the roller bearing is a large bearing, usually with an outer diameter of more than 200 mm, the width of its strip area is generally large enough to accommodate character information with a height of more than 2 mm (preferably 4 mm). As a specific form of the marking area, the strip area already exists in the lubrication groove of the finished outer ring, so no structural machining is required. In addition, the strip area is located at the bottom of the lubrication groove and belongs to the non-load-bearing surface of the bearing, so it is not easily worn when the bearing is running.

[0018] As a second implementation method, Figure 4A schematic diagram showing a method of forming a marking area in a groove (referred to as "end face groove") on the end face of the inner ring. The figure takes a double-row roller bearing as an example, showing that its inner ring has an axially recessed end face groove formed on at least one end face. The end face groove shown is a semicircular or shallow arc-shaped groove that can match with the same type of groove of the adjacent inner ring to form a circular or olive-shaped through hole. There are two common uses for the end face groove. One is to provide a channel for the injection of lubricant as a lubrication hole, and the other is to provide a position for the puller to grab during the disassembly of the bearing. Since the roller bearing is a large bearing, usually with an outer diameter of more than 200 mm, the size of its end face groove is generally large enough to accommodate character information marking with a height of more than 2 mm (preferably 4 mm). The marking area already exists in the end face groove of the finished inner ring, so no structural level machining is required. In addition, the marking area is located on the recessed inner surface of the end face groove and belongs to the non-load-bearing surface of the bearing, so it is not easy to be worn when the bearing is running.

[0019] As a third implementation method, Figure 5 and 6 A schematic diagram showing a method of forming a marking area on the chamfer of the inner ring end face. The figure takes a single-row roller bearing as an example, showing that its inner ring has radially inner and / or outer chamfers formed on at least one side of the end face. Among them, the inner chamfer is used to guide the assembly of the inner ring and the shaft, and the outer chamfer is used to guide the assembly of the rolling element group and the inner ring. Since the roller bearing is a large bearing, usually with an outer diameter of more than 200 mm, the size of its chamfer is generally large enough to accommodate character information marks with a height of more than 2 mm (preferably 4 mm). The marking area already exists on the end face chamfer of the finished inner ring, so no structural machining is required. In addition, the marking area is located on the chamfer and belongs to the non-load-bearing surface of the bearing, so it is not easy to be worn when the bearing is running. For the purpose of assembly convenience, etc., similar chamfers can also be formed on the outer ring of the bearing to provide a marking area for recording information, which will not be repeated here.

[0020] Since rolling bearings are mostly annular in structure, the marking area can be distributed over the entire circumference of the bearing ring. As a preferred embodiment, the bearing information can be marked repeatedly at intervals on the bearing ring, and the number of repeated markings is positively correlated with the diameter of the bearing ring, that is, the larger the size of the bearing ring, the more information is repeated. For large bearings with an outer diameter of more than 200 mm, this feature is particularly conducive to the discovery and identification of information.

[0021] Taking the roller bearing as an example, different implementation methods of forming a marking area on the non-load bearing surface of the bearing ring are listed above. Since the roller bearing is a large bearing, the present invention also has the general significance of being used in other types of large rolling bearings with similar sizes. These large rolling bearings include but are not limited to tapered roller bearings, cylindrical roller bearings and spherical roller bearings, which can be arranged in single row, double row and / or four rows. In the case of an outer diameter of more than 200 mm, these large bearings usually have a non-load bearing surface that is large enough to be used for marking information.

[0022] It is necessary to point out that the lubrication grooves, end face grooves and / or chamfers listed above are not specially provided for the purpose of marking information, but their existence just provides space and convenience for information marking. However, the present invention does not exclude the possibility of setting a special marking area on the bearing ring for the purpose of marking information, but the formation of such a marking area must meet the three conditions mentioned above (time condition, position condition and size condition). In other words, the core purpose of the present invention is to avoid forming a marking area through structural processing at the finished product stage of the bearing ring, because this process will cause many troubles described in the background technology. If the structural processing of the specially set marking area can be completed before the finished product stage, it will not hinder the application of such a specially set marking area in the present invention.

[0023] In addition, the present invention has no restrictions on the technology and equipment used to mark information, and can use either a common laser marking machine or a relatively rare pneumatic grinder. In theory, any existing method that can permanently retain information on the bearing surface can be used to implement the present invention.

[0024] It should be understood by those skilled in the art that the above method of marking information on a rolling bearing and the rolling bearing marked with information using the method are not limited by the specific implementation method, and the more general technical solution shall be subject to the definition in the attached claims. Any changes and improvements to the present invention, as long as they comply with the definition in the attached claims, shall fall within the protection scope of the present invention.

Claims

1. A method for marking information on a large rolling bearing, wherein the bearing has an outer diameter of more than 200 mm, comprises an inner ring, an outer ring, and at least one row of rolling elements arranged between the inner ring and the outer ring, the method comprising the following steps in sequence: 1) forming a non-load bearing surface that does not bear the operating load of the bearing on the inner ring and / or the outer ring before the finished product stage, wherein the non-load bearing surface includes a marking area for marking information that can accommodate characters with a height of more than 2 mm; and 2) Marking the information in the marking area.

2. The information marking method according to claim 1, characterized in that: The non-load bearing surface includes a lubrication groove formed on the outer diameter surface of the outer ring, a groove and / or chamfer formed on the end surface of the inner ring, and / or a chamfer formed on the end surface of the outer ring, and the marking area is formed in the above-mentioned groove and / or chamfer.

3. The information marking method according to claim 2, characterized in that: The information is marked on the inner ring and / or the outer ring at regular intervals in the circumferential direction.

4. A large rolling bearing having an outer diameter of more than 200 mm, comprising an inner ring, an outer ring and at least one row of rolling elements arranged between the inner ring and the outer ring, wherein: The inner ring and / or outer ring has a non-load-bearing surface that does not bear the bearing running load and has been formed before its finished product stage. The non-load-bearing surface contains a marking area that can accommodate characters with a height of more than 2 mm for marking information, and the bearing information is marked in the marking area.

5. The rolling bearing according to claim 4, characterized in that: The non-load bearing surface includes a lubrication groove formed on the outer diameter surface of the outer ring, a groove and / or chamfer formed on the end surface of the inner ring, and / or a chamfer formed on the end surface of the outer ring, and the marking area is formed on the groove and / or chamfer.

6. The rolling bearing according to claim 5, characterized in that: The information is marked on the inner ring and / or the outer ring at regular intervals in the circumferential direction.

7. The rolling bearing according to claim 6, characterized in that: The number of times the information is repeated on the inner circle and / or the outer circle is positively correlated with the diameter of the circle.

8. The rolling bearing according to claim 4, characterized in that: The information is formed in the marking area by laser irradiation or pneumatic grinding.

9. The rolling bearing according to any one of claims 4 to 8, characterized in that: The bearings are cylindrical roller bearings, tapered roller bearings and / or spherical roller bearings, and are arranged in single row, double row and / or four rows.

10. The rolling bearing according to claim 9, characterized in that: The bearing is a roll bearing used in a rolling mill.

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