Method for matching angular contact ball bearings

Abstract

The present application relates to the technical field of bearing detection, and specifically to a matching detection method for angular contact ball bearings, which comprises the following specific steps: measuring the height difference between the inner and outer rings of all bearings to be matched; grouping all bearings to be matched according to the height difference between the inner and outer rings, with bearings having the same height difference between the inner and outer rings forming a group; selecting two groups of bearings and taking one bearing from each group for matching; repeating the matching operation if the pre-tightening amount does not meet the required value; until the pre-tightening amount equals the required value, the two groups of bearings are determined as standard bearings, and the sum of the height difference between the inner and outer rings of the standard bearings is recorded as a standard value; the group of bearings with the sum of the height difference between the inner and outer rings equal to the standard value in the remaining groups of bearings can be directly matched, the present application reduces the cumulative error during matching, avoids repeated calibration work, reduces the labor intensity of operators, and further improves the efficiency of matching detection.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bearing detection, in particular to a method for detecting a pair of angular contact ball bearings. BACKGROUND

[0002] In the industry of machine tools and pumps, angular contact ball bearings are needed to be assembled. Since the two sets of bearings need to be axially pre-tightened after installation to ensure the rigidity and rotation accuracy of the shaft and reduce noise and vibration, etc., the bearings need to be assembled before leaving the factory.

[0003] In order to eliminate the pre-tightening amount and achieve the pre-tightening effect when the bearings are installed on the shaft, the two bearings are tightly placed together during the assembly of angular contact ball bearings, and a certain load is applied to the left and right sides before leaving the factory. The gap δ (pre-tightening amount) between the two inner rings is ensured by grinding the inner ring end face. The specific method is as follows: first, place the two bearings horizontally according to the DB structure, pad the inner ring at the lower end, use an outer spacer to separate the middle, apply a measuring load block on the inner ring at the upper end, use a dial gauge to zero the measuring load block, then remove the dial gauge and the measuring load block, remove the upper angular contact ball bearing, remove the outer spacer, replace it with an inner spacer of the same width to separate the inner rings of the two bearings, and read the dial gauge pointer change value. This method requires the removal of the measuring load block when replacing the inner spacer, which makes it difficult to ensure that the dial gauge is placed in the same position in the middle, and the measuring load block cannot be placed in the middle to achieve uniform loading. In addition, the flatness error of the inner and outer spacers will affect the final result.

[0004] Due to the large error, the measurement result is deviated each time, which requires at least 6 times of repeated measurement for a pair of products. The measurement error of multiple bearings in the same batch will continuously accumulate. Two operators can only assemble 100 pairs in 8 hours a day, which is not only low in efficiency, but also causes the operators to have too much labor intensity due to repeated movement of the measuring load block. SUMMARY

[0005] In view of the defects of the prior art, the present application provides a method for detecting a pair of angular contact ball bearings, which can reduce the accumulation of measurement errors, reduce the labor intensity of the operator, and thus improve the efficiency of the pair detection.

[0006] In order to achieve the above-mentioned purpose, the technical scheme provided by the present application is a method for detecting a pair of angular contact ball bearings, which comprises the following specific steps:

[0007] S100, measuring the height difference between the inner and outer rings of all the bearings to be paired;

[0008] S200, grouping all the bearings to be paired according to the height difference between the inner and outer rings measured in step S100, and the bearings with the same height difference between the inner and outer rings are grouped together;

[0009] S300, select two groups of bearings, and take one bearing in each of the two groups of bearings for pairing; if the pre-tightening amount does not meet the required value, repeat step S300; until the pre-tightening amount is equal to the required value, proceed to step

[0010] S400, determine the two groups of bearings as standard bearings, and record the sum of the inner and outer ring height difference of the standard bearings as a standard value;

[0011] S500, the sum of the inner and outer ring height difference of the bearing group equal to the standard value in the remaining bearing group can be directly assembled.

[0012] Further, the step of measuring the inner and outer ring height difference of all the bearings to be paired in step S100 comprises:

[0013] S110, place the bearing horizontally, pad the inner ring, and apply a load on the outer ring of the bearing;

[0014] S120, rotate the outer ring while using the dial gauge to zero the outer ring end face;

[0015] S130, adjust the relative position of the bearing and the dial gauge so that the dial gauge detects the inner ring height, and the difference between the two is the inner and outer ring height difference.

[0016] Further, step S100 further comprises numbering the bearing groups after grouping.

[0017] Further, the step of pairing in step S300 comprises:

[0018] S310, place the two bearings horizontally, pad the inner ring at the lower end, and separate the two outer rings of the bearings with an outer spacer;

[0019] S320, apply a measuring load block on the upper bearing inner ring, and use the dial gauge to zero the measuring load block;

[0020] S330, remove the dial gauge and the measuring load block, remove the upper angular contact ball bearing, and remove the outer spacer;

[0021] S340, replace the inner spacer with the same width as the outer spacer to separate the inner rings of the two bearings, and read the dial gauge pointer change value as the pre-tightening amount.

[0022] The beneficial effects of the present application: reduce the cumulative error during pairing, can avoid repeated calibration work, reduce the labor intensity of the operator, and further improve the efficiency of pairing detection. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The flowchart of the angular contact ball bearing pairing detection method in an embodiment of the present application;

[0024] Figure 2 A schematic diagram of the state when measuring the height difference between the inner and outer rings in step S110 of an embodiment of the present application;

[0025] Figure 3 A schematic diagram of the state when measuring the height difference between the inner and outer rings in step S130 of an embodiment of the present application;

[0026] Figure 4 A schematic diagram of the state when pairing in step S310 of an embodiment of the present application;

[0027] Figure 5 A schematic diagram of the state when pairing in step S340 of an embodiment of the present application;

[0028] A, B, angular contact ball bearing,

[0029] 100, outer spacer ring,

[0030] 200, measuring load block,

[0031] 300, micrometer,

[0032] 400, inner spacer ring,

[0033] 500, annular load block. DETAILED DESCRIPTION

[0034] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of ways other than those described herein without departing from the spirit and scope of the present application, and it is understood that similar modifications can be made by those skilled in the art without departing from the spirit and scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0035] Referring to Figure 1 A method for detecting pairing of angular contact ball bearings, the specific steps of which include:

[0036] Step S100, measuring the height difference between the inner and outer rings of all bearings to be paired; in an embodiment, the step of measuring the height difference between the inner and outer rings of all bearings to be paired in step S100 includes:

[0037] Step S110, referring to Figure 2 The bearing is placed horizontally, the inner ring is raised, and a load is applied on the outer ring of the bearing; it should be noted that the load is small. In specific operation, an annular load block 500 can be placed on the outer ring. The specific mass of the annular load block 500 can be determined according to the standard, and the load used for bearings of different sizes is different. As an example, the annular load block 500 selected in the present embodiment weighs about 1 / 5 of the weight of the load block used for pairing in a group.

[0038] Step S120, rotate the outer ring while zeroing the dial gauge 300 on the end face of the outer ring;

[0039] Step S130, see Figure 3 Adjust the relative position of the bearing and the dial gauge 300 so that the dial gauge 300 detects the height of the inner ring, and the difference between the two is the height difference between the inner and outer rings. In actual operation, the dial gauge 300 and the instrument are usually integrated and fixed, and can only be detected by moving the bearing and / or the load block. The final change value of the dial gauge is the height difference of the bearing.

[0040] Step S200, group all the bearings to be matched according to the height difference between the inner and outer rings measured in step S100. Bearings with the same height difference between the inner and outer rings are in the same group. Preferably, step S100 further comprises numbering the bearing groups after grouping, which facilitates subsequent matching. For example, in actual operation, angular contact ball bearings with the outer ring 1 μ higher than the inner ring are grouped into a group, marked as the first group, and the height difference between the inner and outer rings is marked as +1. Angular contact ball bearings with the outer ring 1 μ lower than the inner ring are grouped into a group, marked as the second group, and the height difference between the inner and outer rings is marked as -1. Angular contact ball bearings with the outer ring 2 μ higher than the inner ring are grouped into a group, marked as the third group, and the height difference between the inner and outer rings is marked as +2. Angular contact ball bearings with the outer ring 2 μ lower than the inner ring are grouped into a group, marked as the fourth group, and the height difference between the inner and outer rings is marked as -2. The same applies to the rest.

[0041] Step S300, select two groups of bearings and take one bearing from each group for matching. For example, in actual operation, one angular contact ball bearing from the first group is matched with one angular contact ball bearing from the third group. The matching steps include:

[0042] Step S310, see Figure 4 Place the two angular contact ball bearings A and B horizontally according to the DB structure, and place the inner ring of the lower angular contact ball bearing A on a support. The outer rings of the two bearings are separated by an outer spacer 100.

[0043] Step S320, place a measuring load block 200 on the inner ring of the upper angular contact ball bearing B, and zero the dial gauge 300 on the measuring load block 200. When selecting the measuring load block 200, you can query according to the standard, i.e. select different measuring load blocks according to different bearing models and types. The weight of the measuring load block varies from a few kilograms to a few hundred kilograms, and is usually selected within the range of 20-30 kilograms.

[0044] Step S330, remove the dial gauge 300 and the measuring load block 200, and remove the upper angular contact ball bearing B.

[0045] Step S340, see Figure 5The inner ring of the two angular contact ball bearings A and B separated by the inner spacer ring 400 with the same width as the outer spacer ring 100 is replaced, and the change value of the indicator of the dial gauge 300 is read as the pre-tightening amount.

[0046] If the pre-tightening amount does not meet the required value, the step S300 is repeated, the two groups of bearings are reselected, and the pairing is reperformed. Until the pre-tightening amount is equal to the required value, the step S400 is performed. For example, in the specific operation, one angular contact ball bearing in the first group is paired with one angular contact ball bearing in the second group, and if the pre-tightening amount is equal to the required value, the step S400 is performed.

[0047] In the step S400, the two groups of bearings are determined as standard bearings, and the sum of the inner and outer ring height differences of the standard bearings is recorded as a standard value. As an example, the two bearings in the first group and the second group are the standard bearings, and any bearing in the first group and any bearing in the second group can not be re-paired and directly packaged. In addition, the sum of the inner and outer ring height differences of the first group +1 and the inner and outer ring height differences of the second group -1 is recorded as the standard value.

[0048] In the step S500, the bearings in the remaining bearing groups with the sum of the inner and outer ring height differences equal to the standard value can be directly packaged. As an example, the sum of the inner and outer ring height differences of the third group +2 and the inner and outer ring height differences of the fourth group -2 is equal to the standard value, and any bearing in the third group and any bearing in the fourth group can not be re-paired and directly packaged.

[0049] The pairing detection method of the angular contact ball bearings described above measures the inner and outer ring height differences of the bearings and groups all the bearings, and then only needs to determine the standard bearings and the standard value, and directly packages the other bearings according to the standard value, without the need to re-pair and measure the other bearings. The single load weight is only 1 / 5 of the packaging load weight, which can reduce the labor intensity, reduce the weight of the carrying load, and save physical strength. In addition, the number of pairing measurements is greatly reduced, the error range after packaging is effectively reduced, the error is reduced from ±5μ of the traditional method to ±2μ. Furthermore, the pairing speed of the bearings is improved, and two operators can package more than 300 pairs per day for 8 hours, and the efficiency is improved by more than twice.

[0050] In the description of the application, it should be understood that the orientation or positional relationship indicated by terms such as "central", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of facilitating the description of the application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application.

[0051] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include at least one of the features. In the description of the application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0052] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0053] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature. It should be noted that when an element is referred to as "fixed to" or "provided on" another element, it can be directly on another element or there can be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

Claims

1. A method for testing the pairing of angular contact ball bearings, characterized by: steps include: S100. Measure the height difference between the inner and outer rings of all bearings to be paired. S200. Based on the height difference between the inner and outer rings measured in step S100, all bearings to be paired are grouped together, with those having equal height differences between the inner and outer rings forming one group. S300: Select two sets of bearings, and take one bearing from each set for pairing; if the preload does not meet the required value, repeat step S300; until the preload equals the required value, proceed to step... S400. Determine two sets of bearings as standard bearings, and record the sum of the height differences between the inner and outer rings of the standard bearings as the standard value. S500. Bearing assemblies in the remaining bearing assemblies whose sum of the height differences between the inner and outer rings is equal to the standard value can be directly assembled. The step S100, which involves measuring the height difference between the inner and outer rings of all the bearings to be paired, includes: S110. Place the bearing horizontally, raise the inner ring, and apply a load to the outer ring of the bearing. S120, rotate the outer ring while zeroing the outer ring end face using a dial indicator; S130. Adjust the relative position of the bearing and the dial indicator so that the dial indicator measures the height of the inner ring. The difference between the two is the height difference between the inner and outer rings. The pairing step described in step S300 includes: S310. Place the two bearings horizontally, with the inner rings raised at the bottom, and separate the outer rings of the two bearings with an outer spacer. S320. Apply a measuring load block to the inner ring of the upper bearing and zero the measuring load block using a dial indicator. S330, Remove the dial indicator and measuring load block, remove the upper angular contact ball bearing, and remove the outer spacer; S340. Replace the inner rings of the two bearings with an inner ring of the same width as the outer ring, and read the change value of the dial indicator pointer as the preload.

2. The method for testing the pairing of angular contact ball bearings according to claim 1, characterized in that: Step S100 also includes numbering the bearing groups after grouping.

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