A Detection Method for the Center Distance of Machined Raceways of a Double-Row Variable-Diameter Ball-Type Slewing Bearing

Abstract

The present invention relates to a method for measuring the center distance of a bearing, specifically a detection method for the center distance of the raceway in the turning process of a double-row variable-diameter spherical turntable bearing, and the specific steps are as follows: Taking the inner ring of the bearing as the measurement object, during the turning process of the raceway, by increasing the area of the arc raceway to make it higher than the center of the raceway, extending upward along the tangential direction of the minimum diameter dimension in the radial direction of the raceway, and finally the lathe worker forms a cross-sectional raceway curve segment and a cross-sectional raceway straight segment; Using a carbon fiber ruler to align and measure the radial diameter dimension of the raceway; Through the calculation formula, it can be known that the center distance of the raceway = the radial diameter dimension of the raceway measured in step 2 + 2 times the raceway curvature; After the turning process is completed and the measured center distance is qualified, the cross-sectional raceway straight segment is removed according to the process requirements of the drawing, so as to obtain the actual center distance of the raceway. Compared with the existing wire cutting template method, the present invention overcomes the measurement error of making the template, optimizes the turning process of the raceway, and realizes the accurate measurement of the center distance of the raceway.

Description

Technical Field

[0001] The present invention relates to a method for measuring the center distance of a bearing, specifically to a method for detecting the center distance of the raceways in the turning process of a double-row non-uniform-diameter ball type slewing bearing, and belongs to the field of bearing processing. Background Art

[0002] The raceway arc surface of a double-row non-uniform-diameter ball type slewing bearing is about one-fourth of the whole groove. When detecting the center distance of the raceway, since the curvature section of the raceway is lower than the center point of the raceway, it is impossible to control the machining accuracy of the center distance of the raceway. The conventional detection method uses a wire-cut template to detect the center distance of the raceway. Due to certain errors in the process of making the template, accurate measurement of the raceway cannot be achieved, and problems such as out-of-tolerance center distance often occur in the next process of machining the raceway.

[0003] The specific detection methods of the existing conventional detection methods are respectively as Figure 5 and Figure 6 shown:

[0004] Figure 5 , making the wire-cut template into a whole, and using the wire-cut template to detect the center distance of the raceway and the curvature of the raceway.

[0005] Figure 6 , making the wire-cut template into half, positioning the wire-cut template by the inner diameter, and using the wire-cut template to measure the center distance and curvature of half of the raceway.

[0006] The disadvantages of the above two methods are as follows: First, the template is a wire-cut template, and there is an error of about 0.2 mm in the manufacturing process. Second, the inner diameter size has a large scatter after turning, and the measurement of the center distance of the raceway is affected after positioning by the inner diameter. Therefore, it is imperative to solve the problem of detecting the turning process of the raceway of a double-row non-uniform-diameter ball type slewing bearing. Summary of the Invention

[0007] In view of the technical problems existing in the above conventional detection methods, the purpose of the present invention is to provide a method for detecting the center distance of the raceways in the turning process of a double-row non-uniform-diameter ball type slewing bearing, which solves the problem of detecting the center distance of the raceways during the turning process of a double-row non-uniform-diameter ball type slewing bearing.

[0008] In order to achieve the above purpose, the technical solution adopted by the present invention is: A method for detecting the center distance of the raceways in the turning process of a double-row non-uniform-diameter ball type slewing bearing, including the following specific steps:

[0009] 1. Taking the inner ring of the bearing as the measurement object, during the turning of the raceway, by increasing the area of the arc raceway to make it higher than the center of the raceway, extending upward along the tangential direction of the minimum diameter dimension in the radial direction of the raceway, and finally the lathe worker forms a cross-section raceway curve segment and a cross-section raceway straight segment;

[0010] 2. Using a carbon fiber ruler to align and measure the radial diameter dimension of the raceway;

[0011] 3. Through the calculation formula, the radial diameter dimension of the raceway = the center distance of the raceway - 2 times the curvature of the raceway. It can be known that the center distance of the raceway = the radial diameter dimension of the raceway measured in Step 2 + 2 times the curvature of the raceway;

[0012] 4. After the center distance is measured and qualified after turning, the straight section of the cross-section raceway is removed according to the process requirements of the drawing, so as to obtain the actual center distance of the raceway.

[0013] Further, the straight line segment extending upward along the tangent direction of the radial diameter dimension of the raceway in Step 1 exceeds the center of the raceway by 3 - 5 mm; the straight section of the raceway cross-section is the radial diameter measurement area a of the raceway;

[0014] The cross-section raceway curve segment and the cross-section raceway straight segment are formed by one process of the turning tool and are integrally transitioned; in this way, the error of the cross-section raceway straight segment is the same as that of the cross-section raceway curve segment, and then the error of the cross-section raceway curve segment is ensured by controlling the error of the cross-section raceway straight segment;

[0015] Further, the raceway curvature described in Step 3 is the curvature of the cross-section raceway curve segment;

[0016] The raceway curvature described in Step 3 of the present invention is a specific value, which is the nominal standard value specified in the design drawing.

[0017] The principle of the present invention lies in the full utilization of the relationship between the center distance of the raceway, the radial diameter of the raceway and the curvature. Substantially, a machining section is reserved along the tangent direction of the minimum radial diameter of the raceway on the basis of the raceway set by turning. This design method is completely different from the existing method for measuring the center distance of the raceway.

[0018] The beneficial effects of the present invention are:

[0019] Compared with the existing wire cutting template method, it overcomes the measurement error of making the template, utilizes the relationship between the center distance of the raceway, the radial diameter of the raceway and the curvature, optimizes the turning processing technology of the raceway, and realizes the accurate measurement of the center distance of the raceway. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural diagram of a double-row different-diameter ball type turntable bearing to be detected by the present invention.

[0021] Figure 2 For Figure 1 a schematic diagram of the center distance (groove center distance) to be detected of the bearing inner ring.

[0022] Figure 3 A schematic diagram of the detection method of the present invention.

[0023] Figure 4 It is a schematic diagram showing the radial diameter measurement area of the raceway in the detection method of the present invention.

[0024] Figure 5 It is a structural diagram of an existing method for measuring the raceway center distance by using an integral wire cutting template.

[0025] Figure 6 It is a structural diagram of an existing method for measuring the raceway center distance by using a half-section wire cutting template.

[0026] In the figure, a is the measuring area of the raceway radial diameter, b is the raceway center, and d0 is the groove center distance. Specific embodiments

[0027] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following will describe the specific embodiments of the present invention in detail with reference to the accompanying drawings. Many specific details are set forth in the following description to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0028] As Figures 1-4 shown, a method for detecting the raceway center distance in the turning process of a double-row non-uniform-diameter ball type slewing bearing includes the following specific steps:

[0029] 1. Taking the bearing inner ring (shaft ring) as the measurement object, during the turning process of the raceway, by increasing the raceway arc area to make it higher than the raceway center, extending upward along the tangential direction of the minimum diameter dimension in the raceway radial direction, and finally the lathe worker forms a cross-section raceway curve segment and a cross-section raceway straight segment;

[0030] 2. Using a carbon fiber ruler to align and measure the raceway radial diameter dimension;

[0031] 3. Through the calculation formula, the raceway radial diameter dimension = raceway center distance - 2 times the raceway curvature. It can be known that the raceway center distance d0 = the raceway radial diameter dimension measured in step 2 + 2 times the raceway curvature;

[0032] 4. After the turning process is completed and the center distance is measured to be qualified, the cross-section raceway straight segment is removed according to the process requirements of the drawing, so as to obtain the actual raceway center distance.

[0033] The shape of the obtained actual raceway is consistent with the shape required by the drawing;

[0034] The bearing in this embodiment is a double-row non-uniform-diameter ball type slewing bearing, and its structure is composed of a seat ring 01, a first shaft ring 02, a second shaft ring 22, a first row of raceway steel balls 04, and a second row of raceway steel balls 24;

[0035] In this embodiment, the straight line segment extending upward along the tangent direction of the minimum diameter dimension in the radial direction of the raceway in step 1 is such that it exceeds the center of the raceway by b3 - 5 mm; the straight line segment of the raceway cross-section is the measurement area a of the radial diameter of the raceway;

[0036] The cross-sectional raceway curve segment and the cross-sectional raceway straight line segment are formed by one machining process of the turning tool.

[0037] The raceway curvature described in step 3 is the curvature of the cross-sectional raceway curve segment;

[0038] The raceway curvature described in step 3 of the present invention is the nominal standard value specified in the design drawing.

[0039] The key point of the present invention is to fully understand and make full use of the relationship between the raceway center distance, the raceway radial diameter and the curvature, optimize the turning process of the raceway, and achieve accurate measurement of the raceway center distance.

Claims

1. A detection method for the center distance of the raceway in the turning process of a double-row variable-diameter spherical slewing bearing, characterized in that, The specific steps are as follows: (1) Taking the inner ring of the bearing as the measurement object, when turning the raceway, by increasing the area of the raceway arc and extending upward along the tangent direction of the minimum diameter dimension in the radial direction of the raceway, finally, the lathe worker forms a cross-sectional raceway curve segment and a cross-sectional raceway straight segment; (2) Using a carbon fiber ruler to align and measure the radial diameter dimension of the raceway; (3) Through the calculation formula, the radial diameter dimension of the raceway = the center distance of the raceway - 2 times the curvature radius of the raceway. It can be known that the center distance of the raceway = the radial diameter dimension of the raceway measured in step (2) + 2 times the curvature radius of the raceway; (4) After the center distance is measured and qualified at the end of the turning process, the cross-sectional raceway straight segment is removed according to the process requirements of the drawing, so as to obtain the actual center distance of the raceway.

2. A method for detecting the center distance of the raceway in the turning process of a double-row variable-diameter spherical turntable bearing according to claim 1, characterized in that: The straight segment extending upward along the tangent direction of the minimum diameter dimension in the radial direction of the raceway in step (1) is such that it exceeds the raceway center by 3 - 5 mm; the cross-sectional raceway straight segment is the raceway radial diameter measurement area a.

3. A method for detecting the center distance of the raceway in the turning process of a double-row variable-diameter spherical turntable bearing according to claim 1, characterized in that: The cross-sectional raceway curve segment and the cross-sectional raceway straight segment are formed by one operation of the turning tool and are integrally transitioned.

4. A method for detecting the center distance of the raceway in the turning process of a double-row variable-diameter spherical turntable bearing according to claim 1, characterized in that: The curvature radius of the raceway mentioned in step (3) is the curvature radius of the cross-sectional raceway curve segment.

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