Bearing contact angle detection method

Abstract

The invention belongs to the technical field of rolling bearing detection, and particularly discloses a bearing contact angle detection method, which comprises a bearing, an auxiliary cylinder P and an auxiliary cylinder Q. The bearing contact angle detection method comprises the following steps: step (1): pasting the auxiliary cylinder: pasting the auxiliary cylinder P on the upper end face of the outer ring of the bearing, an auxiliary cylinder Q is pasted on the upper end face of the retainer of the bearing; (2) measuring points before rotation of the bearing are collected; (3) an outer ring of the bearing is rotated anticlockwise; (4) measuring points after the bearing rotates are collected; (5) the contact angle alpha of the bearing is calculated through a formula; according to the detection method, a three-coordinate measuring machine is used for collecting coordinates of an auxiliary cylinder on a bearing outer ring and a retainer before and after rotation of the bearing, relevant parameters are output, the contact angle of the measured bearing is obtained through calculation, and therefore the problem that the contact angle of part of the bearings cannot be accurately measured is solved.

Description

Technical Field

[0001] This invention belongs to the field of rolling bearing testing technology, specifically relating to a method for testing bearing contact angle. Background Technology

[0002] The contact angle of a rolling bearing is a key parameter in rolling bearing design, directly affecting the bearing's load-carrying capacity, friction characteristics, and service life. Simply put, the size of the contact angle has a significant impact on bearing performance.

[0003] The contact angle is the angle between the normal to the contact point between the rolling element and the inner or outer raceway of a bearing and the radial plane of the bearing. The size of this angle determines the load distribution of the bearing when subjected to radial and axial loads. Furthermore, the contact angle is closely related to the bearing's frictional characteristics. A larger contact angle typically results in a higher coefficient of friction. This can affect the bearing's operating efficiency and energy consumption. Therefore, when designing bearings, a balance needs to be found between load capacity, frictional characteristics, and service life to select the most suitable contact angle.

[0004] Currently, bearing contact angles are mainly measured using contact angle measuring instruments and manual protractors. When using a contact angle measuring instrument, the range of bearing sizes that can be measured is limited due to the instrument's size constraints; the contact angles of most thin-walled bearings, as well as large and extra-large bearings, cannot be measured using this method. When using a manual protractor, the measurement accuracy cannot be guaranteed due to significant influence from the external environment and human factors.

[0005] Therefore, it is necessary to design a testing method that can measure the bearing contact angle over a wide range of dimensions while ensuring measurement accuracy, so as to effectively evaluate the processing quality of the product and meet the requirements of product design and users for bearing performance. Summary of the Invention

[0006] To address the problems existing in the background art, the present invention provides a method for detecting bearing contact angle.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a bearing contact angle detection method, comprising a bearing, an auxiliary cylinder P, and an auxiliary cylinder Q, wherein the bearing contact angle detection method comprises the following steps: Step (1): Attach auxiliary cylinder: Attach auxiliary cylinder P2 to the upper end face of the outer ring of the bearing, and attach auxiliary cylinder Q to the upper end face of the cage of the bearing; Step (2): Collect measurement points before the bearing rotates: Step (21): Collect the center of the inner ring of the bearing: Use a coordinate measuring machine to collect the center of the inner ring of the bearing. The position of the center is O. Step (22): Collect the center position of the auxiliary cylinder P: Use a coordinate measuring machine to collect the center of the auxiliary cylinder P, and the position of the center is A; Step (23): Collect the center position of the auxiliary cylinder Q: Use a coordinate measuring machine to collect the center of the auxiliary cylinder Q, and the position of the center is B; Step (24): Draw measurement auxiliary lines: In the coordinate measuring machine, connect the two straight lines OA and OB respectively as measurement auxiliary lines; Step (3): Rotate the outer ring of the bearing counterclockwise; during the rotation, the auxiliary cylinder P attached to the outer ring of the bearing rotates counterclockwise with the outer ring of the bearing, and the center of the auxiliary cylinder P rotates ne times from point A to position A'; the cage also rotates counterclockwise with the rotation of the outer ring of the bearing, and the center of the auxiliary cylinder Q on the cage rotates nc times from point B to position B'; Step (4): Collect measurement points after the bearing rotates: Step (41): Collect the center position of the auxiliary cylinder P after rotation: Use a coordinate measuring machine to collect the center of the auxiliary cylinder P after rotation. The position of the center is A'. Step (42): Collect the center position of the auxiliary cylinder Q after rotation: Use a coordinate measuring machine to collect the center of the auxiliary cylinder Q after rotation. The position of the center is B'. Step (43): Draw measurement auxiliary lines: In the coordinate measuring machine, connect the two straight lines OA' and OB' respectively as measurement auxiliary lines; Step (5): Calculate the bearing contact angle α using the formula: Step (51): Measure the included angle: In the coordinate measuring machine, let the included angle between OA and OA' be γ, and measure γ; let the included angle between OB and OB' be β, and measure β; Step (52): Calculate the total radian of rotation from center A to center A' using the following formula:

[0008] Step (53): Calculate the total radian of rotation from center B to center B' using the following formula:

[0009] Step (54): Calculate the bearing contact angle α using the following formula:

[0010] In the formula, Dpw is the pitch circle diameter of the sphere assembly; Dw is the nominal diameter of the sphere.

[0011] The beneficial effects of the present invention are as follows: The present invention provides a method for detecting bearing contact angle. This method uses a coordinate measuring machine to collect the coordinates of the bearing outer ring and the auxiliary cylinder on the cage before and after the bearing rotates, and outputs relevant parameters. The contact angle of the bearing under test is obtained by calculation, thereby solving the problem that the contact angle of some bearings cannot be accurately measured. Attached Figure Description

[0012] Figure 1 This is the front view of the present invention.

[0013] In the diagram: 1. Bearing, 2. Auxiliary cylinder P, 3. Auxiliary cylinder Q. Detailed Implementation

[0014] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0015] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings: A bearing contact angle detection method includes a bearing 1, an auxiliary cylinder P2 and an auxiliary cylinder Q3, and the bearing contact angle detection method includes the following steps: Step (1): Attach auxiliary cylinder: Attach auxiliary cylinder P2 to the upper end face of the outer ring of bearing 1, and attach auxiliary cylinder Q3 to the upper end face of the cage of bearing 1; Step (2): Collect measurement points before bearing 1 rotates: Step (21): Collect the center of the inner ring of bearing 1: Use a coordinate measuring machine to collect the center of the inner ring of bearing 1. The position of the center is O. Step (22): Collect the center position of the auxiliary cylinder P2: Use a coordinate measuring machine to collect the center of the auxiliary cylinder P2. The position of the center is A. Step (23): Collect the center position of the auxiliary cylinder Q3: Use a coordinate measuring machine to collect the center of the auxiliary cylinder Q3. The position of the center is B. Step (24): Draw measurement auxiliary lines: In the coordinate measuring machine, connect the two straight lines OA and OB respectively as measurement auxiliary lines; Step (3): Rotate the outer ring of bearing 1 counterclockwise; during the rotation, the auxiliary cylinder P2 attached to the outer ring of bearing 1 rotates counterclockwise with the outer ring of bearing 1, and the center of the auxiliary cylinder P2 rotates from point A for ne turns to position A'; the cage also rotates counterclockwise with the rotation of the outer ring of bearing 1, and the center of the auxiliary cylinder Q3 on the cage rotates from point B for nc turns to position B'; Step (4): Collect measurement points after the bearing rotates: Step (41): Collect the center position of the auxiliary cylinder P2 after rotation: Use a coordinate measuring machine to collect the center of the auxiliary cylinder P2 after rotation. The position of the center is A'. Step (42): Collect the center position of the auxiliary cylinder Q3 after rotation: Use a coordinate measuring machine to collect the center of the auxiliary cylinder Q3 after rotation. The position of the center is B'. Step (43): Draw measurement auxiliary lines: In the coordinate measuring machine, connect the two straight lines OA' and OB' respectively as measurement auxiliary lines; Step (5): Calculate the bearing contact angle α using the formula: Step (51): Measure the included angle: In the coordinate measuring machine, let the included angle between OA and OA' be γ, and measure γ; let the included angle between OB and OB' be β, and measure β; in actual use, such as Figure 1 As shown, γ is the angle between OA and OA' after OA is rotated counterclockwise, and β is the angle between OB and OB' after OB is rotated clockwise. Step (52): Calculate the total radian of rotation from center A to center A' using the following formula:

[0016] Step (53): Calculate the total radian of rotation from center B to center B' using the following formula:

[0017] Step (54): Calculate the bearing contact angle α using the following formula:

[0018] In the formula, Dpw is the pitch circle diameter of the ball assembly, which is the diameter of the theoretical circle formed by the centers of a row of balls inside the bearing; Dw is the nominal diameter of the ball, which is the distance between two parallel planes that are tangent to the actual surface of the ball.

[0019] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0020] The parts of this invention not described in detail are prior art.

Claims

1. A method for detecting a bearing contact angle, comprising a bearing (1), an auxiliary cylinder P (2) and an auxiliary cylinder Q (3), characterized in that: The bearing contact angle detection method comprises the following steps: Step (1): Paste auxiliary cylinder: paste auxiliary cylinder P (2) on the upper end face of the outer ring of the bearing (1), and paste auxiliary cylinder Q (3) on the upper end face of the retainer of the bearing (1); Step (2): Collect the measurement points before the rotation of the bearing (1): Step (3): Rotate the outer ring of the bearing (1) counterclockwise; Step (4): Collect the measurement points after the rotation of the bearing: Step (5): Calculate the bearing contact angle α by formula.

2. The method of claim 1, wherein: The step (2) comprises the following steps: Step (21): Collect the center of the inner ring of the bearing (1): use a three-coordinate measuring machine to collect the center of the inner ring of the bearing (1), and the position of the center is O; Step (22): Collect the center position of the auxiliary cylinder P (2): use a three-coordinate measuring machine to collect the center of the auxiliary cylinder P (2), and the position of the center is A; Step (23): Collect the center position of the auxiliary cylinder Q (3): use a three-coordinate measuring machine to collect the center of the auxiliary cylinder Q (3), and the position of the center is B; Step (24): Draw the measurement auxiliary line: connect OA and OB in the three-coordinate measuring machine as the measurement auxiliary line.

3. The method of claim 2, wherein: The step (4) comprises the following steps: Step (41): Collect the center position of the auxiliary cylinder P (2) after rotation: use a three-coordinate measuring machine to collect the center of the auxiliary cylinder P (2) after rotation, and the position of the center is A'; Step (42): Collect the center position of the auxiliary cylinder Q (3) after rotation: use a three-coordinate measuring machine to collect the center of the auxiliary cylinder Q (3) after rotation, and the position of the center is B'; Step (43): Draw the measurement auxiliary line: connect OA' and OB' in the three-coordinate measuring machine as the measurement auxiliary line.

4. The method of claim 3, wherein: In the step (3), in the process of rotating the outer ring of the bearing (1), the auxiliary cylinder P (2) pasted on the outer ring of the bearing (1) rotates counterclockwise with the outer ring of the bearing (1), and the center of the auxiliary cylinder P (2) rotates from the point A to the position A' after rotating ne circles; the retainer also rotates counterclockwise with the rotation of the outer ring of the bearing (1), and the center of the auxiliary cylinder Q (3) on the retainer rotates from the point B to the position B' after rotating nc circles.

5. The method of claim 4, wherein: The step (5) comprises the following steps: Step (51): Measure the included angle: in the three-coordinate measuring machine, the included angle between OA and OA' is γ, and γ is measured; the included angle between OB and OB' is β, and β is measured; Step (52): Calculate the total rotation radian of the center A to the center A' after the center A rotates ne circles by the following formula: ; Step (53): Calculate the total rotation radian of the center B to the center B' after the center B rotates nc times by the following formula: ; Step (54): Calculate the bearing contact angle a by the following equation: ; In the formula, Dpw is the pitch diameter of the ball set; Dw is the nominal diameter of the ball.

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