Precise matching method for radial clearance of double-half-inner-ring angular contact ball bearing

Abstract

The invention discloses an accurate matching method for radial clearance of a double-half-inner-ring angular contact ball bearing, and relates to the technical field of bearing manufacturing. In order to solve the problems that an existing method has very strict requirements on the consistency of the eccentricity and the groove curvature radius of a bearing inner ring, fluctuation exceeding 0.005 mm cannot exist, otherwise, a great difference exists between a theoretical matching radial clearance and an actual matching radial clearance, so that the actual matching radial clearance value is out of tolerance, unqualified products are generated, and the production efficiency is low. After two indexes di and L which cannot be accurately detected in an original formula are eliminated, an optimized formula Gr = De-D is calculated through the radial matching clearance, the diameter size of an outer compound circle is obtained only by measuring D after the D passes through a bearing inner ring and a steel ball assembly, and accurate control over the matching radial clearance of the double-half-inner-ring angular contact ball bearing is achieved, so that the accuracy of the matching radial clearance of the double-half-inner-ring angular contact ball bearing is improved, and the accuracy of the matching radial clearance of the double-half-inner-ring angular contact ball bearing is improved. After the matching radial clearance value is detected by a special instrument, the coincidence rate of the matching radial clearance value and the matching radial clearance value can be controlled within 0.001 mm, so that the matching rate of the bearing is greatly improved, and the production efficiency is improved. The method is suitable for bearing manufacturing.

Description

Technical Field

[0001] This invention relates to the field of bearing manufacturing technology, specifically to a method for precisely matching the radial clearance of a double-half inner ring angular contact ball bearing. Background Technology

[0002] Due to their unique structure, double-half inner ring angular contact ball bearings are typically manufactured according to the formula... The radial clearance value of the bearing is controlled by a specific formula, where De is the bottom diameter of the outer ring groove, di is the groove diameter at the position of the double-half inner ring pressure line, r is the radius of the steel ball, and L is the theoretical pressure line width of the bearing inner ring. This method has very strict requirements for the consistency of the bearing inner ring eccentricity and groove curvature radius, and fluctuations exceeding 0.005 mm are not allowed. Otherwise, a large difference will exist between the theoretical and actual radial clearance, resulting in out-of-tolerance values ​​for the actual radial clearance, producing defective products, and further affecting the bearing's performance. Summary of the Invention

[0003] This invention addresses the problem that existing methods have extremely strict requirements for the consistency of bearing inner ring eccentricity and groove curvature radius, with fluctuations not exceeding 0.005 mm. Otherwise, there will be a huge difference between the theoretical and actual radial clearance, leading to out-of-tolerance values ​​of the actual radial clearance and the production of defective products, resulting in low production efficiency. Therefore, this invention proposes a precise matching method for the radial clearance of double-half inner ring angular contact ball bearings.

[0004] The present invention provides a method for precisely matching the radial clearance of a double-half-inner-ring angular contact ball bearing, the specific method of which is as follows:

[0005] Step 1: Taking a certain type of bearing as an example, the theoretical pressure line width of the inner ring is 3.5mm. When the inner ring pressure line width of the bearing is 3.58mm, the inner ring groove diameter increases by 0.009mm compared to the theoretical value.

[0006] Step 2: Apply the formula In this formula, the two indices di and L, which cannot be accurately detected, are eliminated, thereby enabling precise control of the radial clearance.

[0007] Step 3: Optimize the radial clearance calculation formula in Step 2: Gr=De-D, where De is the outer ring groove diameter of the bearing and D is the outer compound circle diameter of the bearing inner ring and steel ball assembly.

[0008] Furthermore, in step two, di is the groove diameter at the position of the double-half inner ring pressure line width;

[0009] Furthermore, in step two, L represents the theoretical pressure line width of the bearing inner ring;

[0010] Furthermore, in step two, De is the bottom diameter of the outer groove and r is the radius of the steel ball;

[0011] Furthermore, in step three, D is the outer diameter of the composite circle obtained by measuring the inner ring of the bearing and the steel ball assembly.

[0012] Compared with the prior art, the present invention has the following advantages:

[0013] This invention overcomes the shortcomings of existing technologies by eliminating the two inaccurately detectable indicators, di and L, from the original formula. The optimized formula Gr=De-D, calculated using radial clearance, only requires D to be measured as the outer diameter of the inner ring and steel ball assembly. This achieves precise control of the radial clearance of double-half-inner-ring angular contact ball bearings. The matching radial clearance value, after testing with specialized instruments, shows a conformity rate within 0.001mm. This method, which replaces inspection with measurement, is low-cost, simple in structure, and easy to operate. It is suitable for mass production of bearings with similar structures, greatly improving bearing assembly rates and thus increasing production efficiency, possessing significant market value. Attached Figure Description

[0014] Figure 1 This is a schematic diagram showing the contact positions of steel balls with different pressure line widths;

[0015] Figure 2 This is a schematic diagram of the pressure line width and groove diameter measurement.

[0016] Figure 3 This is a schematic diagram of the method for detecting the outer circumference of a steel ball. Detailed Implementation

[0017] Specific implementation method one: Combining Figures 1 to 3 This embodiment describes a method for precisely matching the radial clearance of a double-half inner ring angular contact ball bearing. The specific method is as follows:

[0018] Step 1: Taking a certain type of bearing as an example, the theoretical pressure line width of the inner ring is 3.5mm. When the inner ring pressure line width of the bearing is 3.58mm, the inner ring groove diameter increases by 0.009mm compared to the theoretical value.

[0019] Step 2: Apply the formula In this formula, the two indices di and L, which cannot be accurately detected, are eliminated, thereby enabling precise control of the radial clearance.

[0020] Step 3: Optimize the radial clearance calculation formula in Step 2: Gr=De-D, where De is the outer ring groove diameter of the bearing and D is the outer compound circle diameter of the bearing inner ring and steel ball assembly.

[0021] In this specific implementation, taking a certain type of bearing as an example, the theoretical pressure linewidth of the inner ring is 3.5mm. When the inner ring pressure linewidth is 3.58mm, the inner ring groove diameter increases by 0.009mm compared to the theoretical value. However, in actual production, due to the dispersion of the inner ring groove curvature radius R and the inner ring eccentricity, the measured results of the actual inner ring pressure linewidth and inner ring groove diameter are further distorted. Clearance control can only be achieved by excessively restricting the inner ring form and position tolerances, increasing manufacturing costs and limiting bearing production capacity.

[0022] Based on the above analysis results, the formula Gr=De-di-2r- The two inaccurately detectable indicators, di and L, are eliminated, enabling precise control of the radial clearance. Specifically, a precise matching method for the radial clearance of double-half-inner-ring angular contact ball bearings is developed. The radial clearance calculation formula is optimized to Gr=De-D, where De is the outer ring groove diameter and D is the outer compound circle diameter of the bearing inner ring and ball assembly. This method is unaffected by manufacturing variations in the bearing inner ring and changes in the ball diameter. Regardless of changes in the inner ring pressure linewidth and ball diameter, the outer compound circle (see...)... Figure 3 All of these can achieve accurate measurement, thereby optimizing the matching radial clearance calculation formula into a simple subtraction operation.

[0023] Specific Implementation Method Two: Combining Figures 1 to 3 This embodiment further defines the matching method described in Specific Embodiment 1. In this embodiment, a precise matching method for radial clearance of a double-half inner ring angular contact ball bearing is described, where di in step two is the groove diameter dimension at the pressure line width position of the double-half inner ring.

[0024] Specific implementation method three: Combining Figures 1 to 3 This embodiment further defines the matching method described in Specific Embodiment Two. In this embodiment, a precise matching method for radial clearance of a double-half inner ring angular contact ball bearing is described, where L in step two is the theoretical pressure line width of the bearing inner ring.

[0025] Specific implementation method four: Combination Figures 1 to 3 This embodiment further defines the matching method described in Specific Embodiment Three. In this embodiment, a precise matching method for radial clearance of a double-half inner ring angular contact ball bearing is described, where De in step two is the bottom diameter of the outer ring groove and r is the radius of the steel ball.

[0026] Specific Implementation Method Five: Combining Figures 1 to 3This embodiment further defines the matching method described in Specific Embodiment 1. In this embodiment, a precise matching method for radial clearance of a double-half inner ring angular contact ball bearing is described, wherein step D in step three is the outer compound circle diameter obtained by measuring the assembly of the bearing inner ring and the steel ball.

Claims

1. A method for precisely matching the radial clearance of a double-half inner ring angular contact ball bearing, characterized in that: The specific method is as follows: Step 1: Taking a certain type of bearing as an example, the theoretical pressure line width of the inner ring is 3.5mm. When the inner ring pressure line width of the bearing is 3.58mm, the inner ring groove diameter increases by 0.009mm compared to the theoretical value. Step 2: Apply the formula In this formula, the two indices di and L, which cannot be accurately detected, are eliminated, thereby enabling precise control of the radial clearance. Step 3: Optimize the radial clearance calculation formula in Step 2: Gr=De-D, where De is the outer ring groove diameter of the bearing and D is the outer compound circle diameter of the bearing inner ring and steel ball assembly.

2. The method for precisely matching the radial clearance of a double-half inner ring angular contact ball bearing according to claim 1, characterized in that: In step two, di refers to the groove diameter at the position of the double-half inner ring pressure line width.

3. The method for precisely matching the radial clearance of a double-half inner ring angular contact ball bearing according to claim 2, characterized in that: In step two, L represents the theoretical pressure line width of the bearing inner ring.

4. The method for precisely matching the radial clearance of a double-half inner ring angular contact ball bearing according to claim 3, characterized in that: In step two, De is the bottom diameter of the outer groove and r is the radius of the steel ball.

5. The method for precisely matching the radial clearance of a double-half inner ring angular contact ball bearing according to claim 1, characterized in that: In step three, D is the outer diameter of the composite circle obtained by measuring the inner ring and steel ball assembly of the bearing.

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