Method for detecting diameter of inner ring raceway of thrust angular contact ball bearing

Abstract

The invention belongs to the technical field of bearing raceway diameter dimension detection, and particularly relates to a thrust angular contact ball bearing inner ring raceway diameter detection method. The method comprises the following steps: respectively placing balls with the same size on two sides of the diameter of an inner ring raceway of the thrust angular contact ball bearing, and selecting two gauge blocks with the same set height according to the diameters of the balls and contact points of the inner ring raceway of the thrust angular contact ball bearing required by a process; respectively placing the gauge blocks below the small end surface of the inner ring of the thrust angular contact ball bearing, so that the two balls are respectively tangent to the raceway of the inner ring of the thrust angular contact ball bearing at the contact points; the contact point comprises a contact position height and a contact angle; the maximum length between the two balls is measured after the two balls are tangent, the diameter of the inner ring raceway at the contact point is calculated in combination with the diameter of the balls and the contact angle, the method effectively avoids errors caused by section roundness measurement in a three-coordinate measurement method, and the accuracy of thrust angular contact ball bearing inner ring raceway diameter detection is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of bearing raceway diameter size detection, and in particular relates to a method for detecting the inner ring raceway diameter of a thrust angular contact ball bearing. Background Art

[0002] The raceway diameter size of the bearing has a significant impact on the contact angle and assembly height of the finished bearing, and is one of the important inspection items before the bearing is assembled. In the process of measuring the bearing raceway diameter, special bearing instruments, raceway diameter standard parts and instruments are usually used to compare and measure the bearing raceway diameter size. Therefore, the accuracy of the calibration value of the bearing raceway diameter standard parts directly affects the transmission of the value and accuracy during the bearing raceway diameter measurement process, and thus affects the quality of the bearing product. In the field of bearings, it is usually measured directly on the length measuring instrument according to the accuracy requirements of the special diameter standard parts, or the corresponding grade of gauge blocks are selected for comparative measurement. By adjusting the position of the workbench to the maximum diameter of the cross-section of the standard part being measured, the data of the length measuring instrument at this time is recorded, and then the data is processed and the test results are given. However, since the balls in the thrust angular contact ball bearing collide with the inner ring raceway at a fixed position with a contact angle less than 90° when the thrust angular contact ball bearing is working, it is necessary to measure the raceway diameter of a fixed contact point in the bearing process requirements. The raceway diameter at a fixed position of the inner ring of the thrust angular contact ball bearing is as follows: Figure 1 Obviously, the length measuring instrument cannot directly measure the raceway diameter at a fixed position. In the prior art, a three-coordinate measuring machine is used to measure the coordinate values ​​of any three points of the inner ring raceway diameter of the thrust angular contact ball bearing, and then a group of simultaneous equations is used to calculate the diameter size of the inner ring raceway of the thrust angular contact ball bearing. However, due to the limitations of the three-coordinate measurement function, the raceway diameter of a certain fixed contact point measured is greatly affected by the roundness of the raceway section, and a greater uncertainty is introduced, affecting the accuracy of the calibration value. Summary of the invention

[0003] The object of the present invention is to provide a method for detecting the inner ring raceway diameter of a thrust angular contact ball bearing, so as to solve the problem of low detection accuracy of the existing method for detecting the inner ring raceway diameter of a thrust angular contact ball bearing.

[0004] In order to solve the above technical problems, the present invention provides a method for detecting the inner ring raceway diameter of a thrust angular contact ball bearing, comprising: Place balls of the same size on both sides of the inner ring raceway diameter of the thrust angular contact ball bearing, and select two gauge blocks with the same set height according to the ball diameter and the contact point of the inner ring raceway of the thrust angular contact ball bearing required by the process; The gauge blocks are respectively placed below the small end surface of the inner ring of the thrust angular contact ball bearing, so that the two spheres are tangent to the raceway of the inner ring of the thrust angular contact ball bearing at the contact point; the contact point includes the contact position height and the contact angle; After the two balls are tangent to the inner ring raceway of the thrust angular contact ball bearing at the contact point, the maximum length between the two balls is measured, and the inner ring raceway diameter at the contact point is calculated based on the ball diameter and contact angle.

[0005] Furthermore, the formula used to calculate the inner ring raceway diameter at the contact point is: di = Kd(1+cosα) Among them, di is the inner ring raceway diameter of the thrust angular contact ball bearing at the contact point, K is the maximum length between the two spheres, d is the sphere diameter, and α is the contact angle.

[0006] Furthermore, the calculation formula for the set height is: h=r(1+sinα)-H Among them, h is the setting height of the gauge block, r is the radius of the sphere, and H is the height of the contact position.

[0007] Furthermore, the maximum length between the two spheres is directly measured by a length measuring instrument.

[0008] Furthermore, the sphere is a steel ball.

[0009] The beneficial effects of the above technical solution are as follows: the present invention is an improved invention creation, which uses the principle of two-circle inscribed indirect detection of the inner ring raceway diameter of the thrust angular contact ball bearing. First, two spheres of the same size are selected according to the product process requirements, and then two gauge blocks with the same set height are selected according to the sphere diameter and the contact point to support the small end face of the inner ring of the thrust angular contact ball bearing, so as to ensure that the sphere and the inner ring raceway of the thrust angular contact ball bearing are tangent to the contact point required by the product process, and then the inner ring raceway diameter at the contact point can be indirectly calculated based on the maximum length between the two spheres directly measured after tangency, as well as the sphere diameter and the contact angle size, and the geometric relationship between the workpiece raceway, the sphere, and the gauge block, effectively avoiding the error caused by measuring the cross-sectional roundness in the three-coordinate measurement method, improving the detection accuracy of the inner ring raceway diameter standard parts of the thrust angular contact ball bearing, thereby improving the accuracy of the calibration of the inner ring raceway diameter standard parts of the thrust angular contact ball bearing, and improving the detection accuracy of the inner ring raceway diameter measurement of the thrust angular contact ball bearing between the processes in the factory. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the raceway diameter at a fixed position of the inner ring of the thrust angular contact ball bearing; Figure 2 is a flow chart of detecting the inner ring raceway diameter of a thrust angular contact ball bearing according to an embodiment of the method of the present invention; Figure 3 : is a schematic diagram of the measurement principle of the inner ring raceway diameter of a thrust angular contact ball bearing according to an embodiment of the method of the present invention; Figure 4is a geometric relationship diagram between the inner ring raceway diameter of the thrust angular contact ball bearing and the auxiliary tool in the embodiment of the method of the present invention; Figure 5 It is an enlarged view of the local geometric relationship between the inner ring raceway diameter of the thrust angular contact ball bearing and the auxiliary tool in the embodiment of the method of the present invention. DETAILED DESCRIPTION

[0011] In order to make the purpose, technical solutions and advantages of the present invention more clear, the specific implementation methods of the present invention are further described below in conjunction with the accompanying drawings.

[0012] The present invention uses the principle of two-circle inscribed indirect detection of the inner ring raceway diameter of the thrust angular contact ball bearing. First, two spheres of the same size are selected according to the product process requirements, and then two gauge blocks with set heights are selected according to the sphere diameter and the contact point to support the small end face of the inner ring of the thrust angular contact ball bearing, ensuring that the sphere and the inner ring raceway of the thrust angular contact ball bearing are tangent to the contact point required by the product process, and then the inner ring raceway diameter at the contact point can be indirectly calculated based on the maximum length between the two spheres directly measured after tangency, as well as the sphere diameter and the contact angle size, and the geometric relationship between the workpiece raceway, the sphere, and the gauge block, effectively avoiding the error caused by measuring the cross-sectional roundness in the three-coordinate measurement method, improving the detection accuracy of the inner ring raceway diameter standard parts of the thrust angular contact ball bearing, thereby improving the accuracy of the calibration of the inner ring raceway diameter standard parts of the thrust angular contact ball bearing, and improving the detection accuracy of the inner ring raceway diameter measurement of the thrust angular contact ball bearing between the processes in the factory.

[0013] Method Embodiment The present invention provides a method for detecting the inner ring raceway diameter of a thrust angular contact ball bearing. The implementation principle of the method is as follows: Figure 2 As shown, the detailed description is given below.

[0014] 1. Select two spheres of the same size. The material of the sphere is not limited. In this embodiment, the sphere is a steel ball. In order to allow the sphere to be inscribed in the inner raceway of the bearing, the radius r of the steel ball is smaller than the curvature radius R of the inner raceway of the thrust angular contact ball bearing.

[0015] 2. Select two gauge blocks with set heights according to the ball diameter and the contact point required by the thrust angular contact ball bearing process. The two gauge blocks have the same height, and the contact point includes the contact position height and contact angle. The calculation formula for the set height is: h=r(1+sinα)-H Among them, h is the setting height of the gauge block, r is the radius of the sphere, and H is the height of the contact position.

[0016] 3. If Figure 3As shown, the gauge blocks are placed below the small end surface of the inner ring of the thrust angular contact ball bearing, so that the two balls are tangent to the inner ring raceway of the thrust angular contact ball bearing at the contact point, and the maximum length between the two balls is measured after the two balls are tangent to the inner ring raceway of the thrust angular contact ball bearing at the contact point.

[0017] As an implementation method, the inner ring of the thrust angular contact ball bearing is placed on the measuring platform of the horizontal length gauge, two gauge blocks of the same height are supported between the small end face of the inner ring of the thrust angular contact ball bearing and the platform of the length gauge, and two steel balls are placed between the two sides of the raceway diameter of the inner ring of the thrust angular contact ball bearing and the probe of the length gauge, so that the two steel balls are tangent to the raceway of the inner ring of the thrust angular contact ball bearing at the required contact point. After tangency, the maximum length K between the two spheres distributed on both sides of the raceway diameter of the inner ring of the thrust angular contact ball bearing is directly measured using the horizontal length gauge.

[0018] As another embodiment, the inner ring of the thrust angular contact ball bearing can also be placed on the measuring platform, and the gauge blocks are respectively placed under the small end surface of the inner ring of the thrust angular contact ball bearing, supported between the small end surface of the inner ring of the thrust angular contact ball bearing and the measuring platform, so that the two balls are tangent to the inner ring raceway of the thrust angular contact ball bearing at the contact point. After tangency, the maximum length K between the two balls distributed on both sides of the inner ring raceway diameter of the thrust angular contact ball bearing is directly measured using a length gauge or other measuring tools (such as an outside diameter micrometer).

[0019] 4. If Figure 4 and Figure 5 As shown, based on the principle of two inscribed circles and the geometric relationship between the workpiece raceway, the sphere, and the gauge block, the inner raceway diameter at the contact point is calculated based on the maximum length between the two spheres, the sphere diameter, and the contact angle. The formula used to calculate the inner raceway diameter at the contact point is: di = Kd(1+cosα) Among them, di is the inner ring raceway diameter of the thrust angular contact ball bearing at the contact point, K is the maximum length between the two spheres, and d is the sphere diameter.

[0020] 5. After calculating the inner ring raceway diameter of the thrust angular contact ball bearing at the specified contact point required by the process, the diameter data is recorded and stored.

[0021] The present invention selects two steel balls of the same size and appropriate diameter according to the product process requirements of the thrust angular contact ball bearing, and selects two gauge blocks of appropriate height and the same height to support the small end face of the inner ring of the thrust angular contact ball bearing, so as to ensure that the steel ball and the inner ring raceway of the thrust angular contact ball bearing are tangent to the position point required by the product process. After tangent, it is only necessary to measure the maximum distance between the two steel balls, and then the diameter of the inner ring raceway of the thrust angular contact ball bearing at the specified contact point can be indirectly calculated by using the principle of two-circle inscription and the geometric relationship between the workpiece raceway and the sphere and the gauge block, which effectively avoids the large error caused by measuring the cross-section roundness in the prior art and solves the limitation problem that the standard parts of the inner ring raceway diameter of the thrust angular contact ball bearing cannot be effectively calibrated. And the use of the length measuring instrument improves the accuracy of the measurement result, which is suitable for measuring the inner ring raceway diameter of the thrust angular contact ball bearing between the processes in the factory.

Claims

1. A method for detecting the inner ring raceway diameter of a thrust angular contact ball bearing, characterized in that: include: Place balls of the same size on both sides of the inner ring raceway diameter of the thrust angular contact ball bearing, and select two gauge blocks with the same set height according to the ball diameter and the contact point of the inner ring raceway of the thrust angular contact ball bearing required by the process; The gauge blocks are respectively placed under the small end faces of the inner rings of the thrust angular contact ball bearings, so that the two spheres are tangent to the raceways of the inner rings of the thrust angular contact ball bearings at the contact points; the contact points include the contact position height and the contact angle; After the two balls are tangent to the inner ring raceway of the thrust angular contact ball bearing at the contact point, the maximum length between the two balls is measured, and the inner ring raceway diameter at the contact point is calculated based on the ball diameter and contact angle.

2. The method for detecting the inner ring raceway diameter of a thrust angular contact ball bearing according to claim 1, characterized in that: The formula used to calculate the inner ring raceway diameter at the contact point is: di=Kd(1+cosα) Among them, di is the inner ring raceway diameter of the thrust angular contact ball bearing at the contact point, K is the maximum length between the two spheres, d is the sphere diameter, and α is the contact angle.

3. The method for detecting the inner ring raceway diameter of a thrust angular contact ball bearing according to claim 1 or 2, characterized in that: The calculation formula for the set height is: h=r(1+sinα)-H Among them, h is the setting height of the gauge block, r is the radius of the sphere, and H is the height of the contact position.

4. The method for detecting the inner ring raceway diameter of a thrust angular contact ball bearing according to claim 1, characterized in that: The maximum length between the two spheres is directly measured by a length measuring instrument.

5. The method for detecting the inner ring raceway diameter of a thrust angular contact ball bearing according to claim 1, characterized in that: The sphere is a steel ball.

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