Method for controlling axial play of four-point contact ball bearing

Abstract

The present application belongs to the technical field of bearing detection, and particularly relates to a four-point contact ball bearing axial clearance control method, which comprises an inner ring raceway size determination method and an outer ring raceway size determination method. The inner ring raceway size determination method and the outer ring raceway size determination method are used to grind the bearing ring raceway, so as to control the axial clearance. The present application fully understands the relationship between the four-point contact ball bearing raceway contact point position and the axial clearance, and uses the proportional relationship between the radial clearance and the axial clearance to convert the amount of grinding required by the inner ring raceway to ensure the appropriate axial clearance. The appropriate axial clearance of the bearing can be determined without sample ring inspection, the workpiece quality is ensured, and the production rhythm is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of bearing detection, and particularly relates to a four-point contact ball bearing axial clearance control method. BACKGROUND

[0002] In actual production, the raceway sample ring of the four-point contact ball bearing is self-selected, that is, a sample is selected from the processed products and sent to a measurement identification station for detection. When the processing rhythm is fast, new products are numerous, and the production task is tight, many new product raceway sample rings cannot be detected in time. Therefore, a four-point contact ball bearing axial clearance control method without a raceway sample ring is needed to meet the production task. SUMMARY

[0003] In view of the defects in the prior art, the purpose of the present application is to provide a four-point contact ball bearing axial clearance control method to solve the problem of four-point contact ball bearing axial clearance control without detecting the raceway sample ring due to urgent production needs.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present application is as follows: a four-point contact ball bearing axial clearance control method, including an inner ring raceway size determination method, specifically comprising the following steps:

[0005] Step one, assemble the outer ring, one of the split inner rings and the steel balls, after assembly, place the inner ring downward on the water platform surface, rotate the outer ring, and observe the actual contact point position of the inner ring raceway and the steel balls by disassembling the sleeve;

[0006] Step two, the intersection of the angle line of the contact angle θ and the inner ring raceway is the theoretical contact point of the inner ring raceway, and the effective contact area is a certain area around the theoretical contact point, and the relative position relationship between the effective contact area and the actual contact point position is observed;

[0007] Step three, if the actual contact point position is below the effective contact area, the raceway is overground; if the actual contact point position is above the effective contact area, the raceway is underground, and at this time, the raceway is ground to the actual contact point position into the effective contact area;

[0008] Step four, detect the axial clearance of the bearing as Ga 实测 ;

[0009] Step five, if the axial clearance detection value Ga 实测 is less than the standard axial clearance Ga 标准 , the grinding amount required in the radial direction of the inner ring raceway is converted according to the proportional relationship between the radial clearance and the axial clearance; if the axial clearance detection value Ga 实测 is greater than the standard axial clearance Ga 标准 , the end faces of the two inner rings are ground.

[0010] Further, for step five, when the axial clearance detection value is less than the standard axial clearance, the grinding amount required in the radial direction of the inner ring raceway is (Ga 标准 -Ga 实测 ) * tan θ.

[0011] Further, for step five, when the axial clearance detection value is greater than the standard axial clearance, the total grinding amount of a group of inner ring end faces is Ga 实测 -Ga 标准 , and the grinding amount of a single inner ring combined end face is (Ga 实测 -Ga 标准 ) / 2.

[0012] Further, for step one, before assembling the inner ring, evenly apply red printing oil to the inner raceway surface, disassemble the sleeve and observe the inner raceway. The actual contact point position of the inner raceway and the steel ball is where the red printing oil is lighter.

[0013] Further, for step two, the effective contact area is within 2mm above and below the theoretical contact point.

[0014] Further, for step three, after grinding the raceway to the actual contact point position and entering the effective contact area, assemble one inner ring and outer ring, steel balls, and move one of the steel balls towards the direction of the raceway. Observe whether the steel ball can pass through the corresponding raceway diameter of the remaining steel balls. If the steel ball can pass through, it means that there is radial clearance, that is, there is axial clearance.

[0015] The four-point contact ball bearing axial clearance control method further includes an outer ring raceway size determination method, and the specific steps are as follows:

[0016] Step one, calculate the distance between the outer surface of the outer ring and the corresponding steel ball top in the diameter direction under the theoretical condition, denoted as H;

[0017] Step two, place the outer ring vertically, and place a sleeve with steel balls in the outer ring raceway. Measure the size of the outer surface of the outer ring to the top of the steel ball, denoted as H';

[0018] Step three, compare the size of H and H';

[0019] If H' > H, it means that the outer ring raceway allowance is less than 0, and the outer ring raceway is undergrinded.

[0020] If H' < H, it means that the outer ring raceway allowance is greater than 0, and the outer ring raceway is overgrinded.

[0021] Further, the amount of undergrinding or overgrinding of the outer ring raceway is equal to the absolute value of the difference between H' and H multiplied by 2.

[0022] Further, in step one, H=(D'-ball top size) / 2, D' is the outer diameter size of the outer ring, and the ball top size is the shortest distance between the surfaces of two steel balls in the diameter direction.

[0023] Further, the ball top size H' from the outer surface to the steel ball is measured by an outer diameter micrometer.

[0024] The beneficial effects of the present application are that the present application fully understands the relationship between the four-point contact ball bearing raceway contact point position and the axial clearance, and utilizes the proportional relationship between the radial clearance and the axial clearance to convert the amount of grinding required for the inner ring raceway to ensure the appropriate axial clearance. The appropriate axial clearance of the bearing can be determined without a sample ring, ensuring the quality of the workpiece and improving the production rhythm. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of the QJ type four-point contact ball bearing.

[0026] Figure 2 It is a bearing placement diagram for determining the size of the outer ring raceway.

[0027] Figure 3 It is a bearing placement diagram for determining the size of the inner ring raceway.

[0028] Figure 4 It is a schematic diagram of the effective contact area of the inner ring raceway.

[0029] Figure 5 It is a comparison diagram of the actual contact point and the effective contact area.

[0030] Figure 6 It is a schematic diagram of the inner ring raceway.

[0031] Figure 7 It is a schematic diagram of the inner ring raceway. Figure 6 It is an enlarged schematic diagram of the grinding of the inner ring raceway.

[0032] Figure 8 It is an enlarged diagram of the raceway part. Figure 7

[0033] In the figure: 1, outer ring, 2, steel ball, 3, first inner ring, 4, second inner ring, 5, effective contact area, 6, raceway size under-grinding contact area, 7, raceway size over-grinding contact area, 8, current position of raceway, 9, position of raceway after grinding.

[0034] F, steel ball size, E, ball top size, D', outer diameter of the outer ring. DETAILED DESCRIPTION

[0035] In order to make the structure and function of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. ​

[0036] Referring to the accompanying drawings Figures 1-8 , a four-point contact ball bearing axial clearance control method, including an outer ring raceway size determination method and an inner ring raceway size determination method, takes a QJ type four-point contact ball bearing as an example, see Figure 1 .

[0037] I. Outer ring raceway size determination method

[0038] Theoretically calculate the distance H between the outer surface of the outer ring and the top of the steel ball under the nominal size, at which time the outer surface size deviation and the raceway size deviation are both 0, i.e. the outer surface size and the raceway size are both theoretical standard values. The product drawing is shown in Figure 2 .

[0039] H = (D' - ball top size) / 2, D' is the outer diameter size of the outer ring, and the ball top size is the closest distance between the surfaces of two steel balls in the diameter direction, both D' and the ball top size are product theoretical design values and can be directly calculated.

[0040] Place the outer ring vertically, place a steel ball in the raceway with a sleeve, and measure the size H' from the outer surface to the top of the steel ball with an outer diameter micrometer.

[0041] If H' > H, it means that the raceway allowance is less than 0, the reading is -, indicating that the raceway is under-milled

[0042] If H' < H, it means that the raceway allowance is greater than 0, the reading is +, indicating that the raceway is over-milled

[0043] The amount of under-milling or over-milling is equal to the absolute value of the difference between H' and H multiplied by 2.

[0044] II. Inner ring raceway size determination method

[0045] After the outer ring raceway is processed, the outer ring, one of the inner rings, and the steel balls are assembled. Before the inner ring is assembled, the inner raceway surface is evenly coated with red printing ink. After assembly, the inner ring is placed on the water platform surface with the inner ring facing down, as shown in Figure 3 . Rotate the outer ring for more than 2 turns, disassemble the sleeve, and observe the position of the inner raceway and the steel ball contact point. The raceway is coated with red printing ink, and after assembly and rotation, the color of the red printing ink at the contact point between the steel ball and the raceway will become lighter, making it easier to determine the contact position of the steel ball and the raceway.

[0046] The theoretical raceway contact point position is shown in Figure 4 . Within the range of about 2 mm above and below the angle line of the contact angle θ, the effective contact area of the steel ball and the raceway is basically within the range. From a visual perspective, the raceway contact point position may be roughly close to the middle of the effective contact area slightly above.

[0047] In the case of under-milling and over-milling of the inner ring raceway size, the actual contact point position is above and below the theoretical contact point position, respectively, as shown in Figure 5 .

[0048] When the inner ring raceway contact point position is in the contact area above the contact point, it indicates that there is no radial clearance of the raceway, less than 0; continue to process the inner ring raceway, and the processing is repeated, when the inner ring raceway contact point position enters the effective contact area, preferably approaches the theoretical contact point position, assemble the inner ring and the outer ring and the steel ball, the steel ball is close to each other in one direction in the raceway, then move one of the steel balls to observe whether the steel ball can pass through the maximum diameter direction of the corresponding raceway of the remaining steel balls, that is, the steel ball can pass in the diameter direction, assemble the steel balls to close in one direction, move one of the steel balls after closing, and the remaining steel balls are stationary, to ensure that the moved steel ball can pass through the position 180 degrees away from the remaining steel balls. If there is no radial clearance, the steel ball cannot pass through, if the steel ball can pass through, it proves that there is a radial clearance, that is, there is an axial clearance. At this time, the axial clearance detection method is used for detection, that is, the bearing is placed horizontally, the outer ring of the bearing is supported, and the inner ring of the bearing is moved up and down. The measuring table is placed on the end face of the inner ring of the bearing, and the movement of the inner ring of the bearing is detected by the measuring table, that is, the axial clearance of the bearing.

[0049] If the axial clearance detection value Ga 实测 is less than the standard axial clearance Ga 标准 , the proportional relationship between the radial clearance and the axial clearance is converted, and the amount of grinding required in the radial direction of the inner ring raceway is converted.

[0050] The principle diagram of the proportional relationship conversion is shown in Figures 6-8 .

[0051] After the inner ring raceway is ground, the B point moves to the D point on the contact angle line, the B point moves to the C point in the radial direction, and the B point moves to the A point in the axial direction.

[0052] BC=Gr / 2 (half of the radial clearance)

[0053] BA=Ga / 2 (half of the axial clearance)

[0054] In triangle ABC, ∠BAC=θ=contact angle

[0055] tanθ=BC / AB=Gr / Ga

[0056] Gr=Ga*tanθ

[0057] The standard axial clearance is referred to as Ga 标准

[0058] The actual measured axial clearance is referred to as Ga 实测

[0059] The grinding amount of the inner ring raceway converted by the proportional relationship is (Ga 标准 -Ga 实测) tan θ

[0060] If the axial clearance detection value Ga 实测 is greater than the standard axial clearance Ga 标准 , a set of inner ring joint surfaces need to be ground, and the total amount of grinding of a set of end surfaces = Ga 实测 -Ga 标准 , the grinding amount of a single inner ring joint surface = (Ga 实测 -Ga 标准 ) / 2.

[0061] The key point of the present application is to fully understand the relationship between the four-point contact ball bearing raceway contact point position and the axial clearance, to control the inner ring raceway size close to the required size by using the dyeing method, and then to convert the grinding amount of the inner ring raceway required to ensure the appropriate axial clearance by using the proportional relationship between the radial clearance and the axial clearance. At the same time, the method of repairing the inner ring joint surface if the axial clearance is out of tolerance is also proposed.

[0062] The above only lists the best embodiments of the present application. Obviously, the present application is not limited to the above embodiments, and there can be many variations. All variations that can be directly derived or inferred by those skilled in the art from the disclosure of the present application should be considered as falling within the scope of protection of the present application.

Claims

1. A method of controlling the axial play of a four-point contact ball bearing, characterized in that, The application relates to a method for determining the size of an inner ring raceway, which comprises the following steps: Step one: one of the split inner rings and the outer ring are assembled with the steel balls, and then the inner ring is placed on a water platform in an integral manner, the outer ring is rotated, and the actual contact point position of the inner ring raceway and the steel balls is observed; Step two: the intersection of the angle line of the contact angle theta and the inner ring raceway is the theoretical contact point of the inner ring raceway, the effective contact area is a certain area around the theoretical contact point, and the relative position relationship between the effective contact area and the actual contact point position is observed; Step three: if the actual contact point position is below the effective contact area, the raceway is overground; if the actual contact point position is above the effective contact area, the raceway is underground, and the raceway is ground to the actual contact point position into the effective contact area; Step four, the axial play of the bearing is detected and noted as Ga 实测 ; Step five, axial clearance detection value Ga 实测 Less than the standard axial clearance Ga 标准 , according to the proportional relationship between the radial clearance and the axial clearance, the amount of grinding required in the radial direction of the inner ring raceway is converted; axial clearance detection value Ga 实测 Greater than the standard axial clearance Ga 标准 Grinding the end faces of the two inner rings combined.

2. The four-point contact ball bearing axial play control method of claim 1, wherein, For the step five, when the axial play detection value is less than the standard axial play, the grinding amount required in the radial direction of the inner ring raceway is (Ga 标准 -Ga 实测 )*tanθ.

3. The four-point contact ball bearing axial play control method of claim 1, wherein, For step five, when the axial clearance detection value is greater than the standard axial clearance, the total grinding amount of the end face of the inner ring is Ga 实测 -Ga 标准 , and the grinding amount of the combined end face of a single inner ring is (Ga 实测 -Ga 标准 ) / 2.

4. The four-point contact ball bearing axial play control method of claim 1, wherein, For step one, the inner ring raceway surface is evenly coated with red printing oil before the inner ring is assembled, the inner ring raceway is observed, and the actual contact point position of the inner ring raceway and the steel balls is the lighter part of the constant color printing oil on the inner ring raceway surface.

5. The four-point contact ball bearing axial play control method of claim 1, wherein, For step two, the effective contact area is within the range of 2 mm above and below the theoretical contact point.

6. The four-point contact ball bearing axial play control method of claim 1, wherein, For step three, after the raceway is ground to the actual contact point position into the effective contact area, one inner ring and the outer ring and the steel balls are assembled, the steel balls are gathered in one direction in the raceway, then one of the steel balls is moved, and whether the steel ball can pass through the corresponding raceway diameter of the remaining steel balls is observed; if the steel ball can pass through, it is proved that the radial clearance exists, that is, the axial clearance exists.

7. The four-point contact ball bearing axial play control method of claim 1, wherein, The application also relates to a method for determining the size of an outer ring raceway, and the specific steps are as follows: Step one: the distance between the outer surface of the outer ring and the top of the corresponding steel ball in the diameter direction under the theoretical condition is calculated and recorded as H; Step two: the outer ring is vertically placed, one assembled steel ball is placed in the outer ring raceway, and the size of the outer surface of the outer ring to the top of the steel ball is measured and recorded as H'; Step three: the size of H and H' is compared; If H'>H, it is proved that the outer ring raceway allowance is less than 0, and the outer ring raceway is underground. If H 8. The four-point contact ball bearing axial play control method of claim 7, wherein, The amount of the underground or overground outer ring raceway is equal to the absolute value of the difference between H' and H multiplied by 2.

9. The four-point contact ball bearing axial play control method of claim 7, wherein, For step one, H=(D'-ball top size) / 2, D' is the outer diameter size of the outer ring, and the ball top size is the shortest distance between the surfaces of two steel balls in the diameter direction.

10. The four-point contact ball bearing axial play control method of claim 7, wherein, The size H' of the outer surface to the top of the steel ball is measured by an outer diameter micrometer.

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