A bearing contact angle detection method

Abstract

The application belongs to the technical field of detection of rolling bearings, and specifically 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 auxiliary cylinders: pasting the auxiliary cylinder P on the upper end face of the outer ring of the bearing and pasting the auxiliary cylinder Q on the upper end face of the retainer of the bearing; step (2), collecting measurement points before rotation of the bearing; step (3), counterclockwise rotating the outer ring of the bearing; step (4), collecting measurement points after rotation of the bearing; and step (5), calculating the bearing contact angle alpha through a formula. The detection method collects the coordinates of the auxiliary cylinders on the outer ring and the retainer of the bearing before and after rotation of the bearing by using a three-coordinate measuring machine, and outputs relevant parameters, and the bearing contact angle is obtained through calculation, so that the problem that the contact angle of some 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. It directly affects the bearing's load-carrying capacity, friction characteristics, and service life. Simply put, the size of the contact angle has a significant impact on the bearing's performance.

[0003] The contact angle is the angle between the normal at the contact point between the rolling element and the inner and outer raceways of the bearing and the radial plane of the bearing. The size of this angle determines the load distribution of the bearing when bearing radial and axial loads. In addition, the contact angle is also closely related to the frictional characteristics of the bearing. A larger contact angle usually leads to a higher coefficient of friction, which may 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, the main methods for measuring bearing contact angle are contact angle measuring instruments and manual protractors. When using a contact angle measuring instrument, the range of bearing sizes that can be measured is relatively small due to the size limitations of the instrument itself. The contact angles of most thin-walled bearings, large and extra-large bearings cannot be measured using a contact angle measuring instrument. When using a manual protractor, the measurement accuracy cannot be guaranteed due to the significant influence of 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, this invention proposes 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:

[0008] Step (1): Attach auxiliary cylinder: Attach auxiliary cylinder P 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;

[0009] Step (2): Collect measurement points before the bearing rotates; Step (2) includes the following steps:

[0010] 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.

[0011] 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;

[0012] 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;

[0013] Step (24): Draw measurement auxiliary lines: In the coordinate measuring machine, connect the two straight lines OA and OB respectively as measurement auxiliary lines;

[0014] Step (3): Rotate the outer ring of the bearing counterclockwise;

[0015] Step (4): Collect measurement points after the bearing rotates; Step (4) includes the following steps:

[0016] 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'.

[0017] 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'.

[0018] Step (43): Draw measurement auxiliary lines: In the coordinate measuring machine, connect the two straight lines OA' and OB' respectively as measurement auxiliary lines;

[0019] Step (5): Calculate the bearing contact angle α using the formula; Step (5) includes the following steps:

[0020] 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;

[0021] Step (52): Calculate the rotation n of the center A using the following formula. e Total rotational radians from the center A' of the circle:

[0022] ;

[0023] Step (53): Calculate the rotation n of the center B using the following formula. c Total rotational radians from the center B' of the circle:

[0024] ;

[0025] Step (54): Calculate the bearing contact angle α using the following formula:

[0026] ;

[0027] In the formula, D pw D is the diameter of the pitch circle of the ball assembly; w The nominal diameter of the sphere.

[0028] In step (3), during the rotation of the outer ring of the bearing, the auxiliary cylinder P attached to the outer ring rotates counterclockwise with the outer ring, and the center of the auxiliary cylinder P rotates n from point A. e After rotating to position A', the cage rotates counterclockwise along with the outer ring of the bearing, and the center of the auxiliary cylinder Q on the cage rotates n times from point B. c Rotate to position B' after circling.

[0029] The beneficial effects of the present invention: The present invention proposes a method for detecting bearing contact angle. This detection 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

[0030] Figure 1 This is the front view of the present invention.

[0031] In the diagram: 1. Bearing, 2. Auxiliary cylinder P, 3. Auxiliary cylinder Q. Detailed Implementation

[0032] 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.

[0033] The following is in conjunction with the appendix Figure 1 The specific embodiments of the present invention are further described in detail below: 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:

[0034] 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;

[0035] Step (2): Collect measurement points before bearing 1 rotates:

[0036] 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.

[0037] 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.

[0038] 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.

[0039] Step (24): Draw measurement auxiliary lines: In the coordinate measuring machine, connect the two straight lines OA and OB respectively as measurement auxiliary lines;

[0040] 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 along with the outer ring of bearing 1, and the center of the auxiliary cylinder P2 rotates n from point A. e After rotating to position A', the cage rotates counterclockwise along with the outer ring of bearing 1, and the center of the auxiliary cylinder Q3 on the cage rotates n times from point B. c Rotate to position B' after circling;

[0041] Step (4): Collect measurement points after the bearing rotates:

[0042] 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'.

[0043] 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'.

[0044] Step (43): Draw measurement auxiliary lines: In the coordinate measuring machine, connect the two straight lines OA' and OB' respectively as measurement auxiliary lines;

[0045] Step (5): Calculate the bearing contact angle α using the formula:

[0046] 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.

[0047] Step (52): Calculate the rotation n of the center A using the following formula. eTotal rotational radians from the center A' of the circle:

[0048] ;

[0049] Step (53): Calculate the rotation n of the center B using the following formula. c Total rotational radians from the center B' of the circle:

[0050] ;

[0051] Step (54): Calculate the bearing contact angle α using the following formula:

[0052] ;

[0053] In the formula, D pw D 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; w The nominal diameter of the sphere is the distance between two parallel planes that are tangent to the actual surface of the sphere.

[0054] 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.

[0055] The parts of this invention not described in detail are prior art.

Claims

1. A method for detecting 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 includes the following steps: Step (1): Attach auxiliary cylinder: Attach auxiliary cylinder P (2) to the upper end face of the outer ring of bearing (1), and attach auxiliary cylinder Q (3) to the upper end face of the cage of bearing (1). Step (2): Collect measurement points of bearing (1) before rotation; Step (2) includes the following steps: Step (21): Collect the center of the inner ring of the bearing (1): Use a 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 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 coordinate measuring machine to collect the center of the auxiliary cylinder Q (3), 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 bearing (1) counterclockwise; Step (4): Collect measurement points after the bearing rotates; Step (4) includes the following steps: Step (41): Collect the center position of the auxiliary cylinder P (2) after rotation: Use a coordinate measuring machine to collect the center of the auxiliary cylinder P (2) after rotation. The position of the center is A'. Step (42): Collect the center position of the auxiliary cylinder Q (3) after rotation: Use a coordinate measuring machine to collect the center of the auxiliary cylinder Q (3) 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 (5) includes the following steps: 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 rotation n of the center A using the following formula. e Total rotational radians from the center A' of the circle: ； Step (53): Calculate the rotation n of the center B using the following formula. c Total rotational radians from the center B' of the circle: ； Step (54): Calculate the bearing contact angle α using the following formula: ； In the formula, D pw D is the diameter of the pitch circle of the ball assembly; w The nominal diameter of the sphere.

2. The bearing contact angle detection method according to claim 1, characterized in that: In step (3), during the rotation of the outer ring of the bearing (1), the auxiliary cylinder P (2) attached to 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 n from point A. e After rotating to position A', the cage rotates counterclockwise along with the outer ring of the bearing (1), and the center of the auxiliary cylinder Q (3) on the cage rotates n from point B. c Rotate to position B' after circling.

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