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/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131"; Home>Bearing knowledge>Compared with two methods for measuring bearing bush preload Comparison of two methods for measuring the preload of the bearing bush
It is necessary to pay attention to the measured diameter of the lead wire used for the measurement of 1.5 to 2 times. If only the lead wire with a relatively large diameter is required; when the preload of the bearing bush is measured by the method of pressing lead, attention should be paid to the deformation and extension limit; The lead wire is not pressed to the limit of its deformation; otherwise it will lead to faulty results. /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
1. To avoid the relative displacement of the main shaft during the operation of the main engine and the occasional oscillation, which affects the oil passage; the bearing bush of the compressor has a certain pre-tightening force (the back interference). The main effect is In order to ensure that the tile back and the tile seat have a satisfactory contact force, then the bearing is damaged, the machine is unstable, the oscillation is increased, and even the serious damage of the rotor is formed. Some of the machine's bearing bush is made into a detachable bearing bush (only when repairing and replacing) Need to change the core; can reduce the cost) For this type of bearing, there is still one interference, the second interference; the effect is the same, but whether it is a one-time surplus or a second interference, the demand is in the appropriate range. Inside; if the interference is too small, it will loosen; if it is too large, it will deform the bearing.
2. The original drawing equipment value of the open factory is the H500 6. 2 1. 0 type air compressor original drawing equipment value is shown in Table 1.
Table 1 H500 air compressor original drawing equipment value item shaft diameter tile back interference top clearance single side gap one, two secondary bearing φ 115 0.03~0.05 0.186~0.248 0.093~0. 124 Three, four-stage bearing φ 105 0.03~0.05 0.168~0.218 0.084~0.109
The test condition was outstanding. Then the package was sent to the user. The value (measured by the pressure lead method) was installed.
3. Method and value for measuring the back of the tile on both sides 3. The method of measuring the back of the tile is as follows: if the top A of the bearing is tightly attached to the tile cover in the free state; as shown in Figure 1, the upper and lower counterparts of the tile cover There is O in the contact area BC. 05mm gap, then; when the BC is pressed, the tile cover and the bearing bush are tightly gripped; the tile cover and the bearing bush have a 0. 05mm interference. The measurement of the tile back interference can usually be performed by the lead-press method; the values ​​of the three places are measured abc You can get the back of the tile:
δ = b+c /2-a
3. 2 The measurement method of metallurgy and the value of the bearing pad at the top of the tile and the tile cover at point A placed φ 0. 5mm lead wire; metallurgy in the process of the process using the pressure lead method to measure the secondary tile back interference when the upper and lower tile cover The thickness of each contact surface BC is b=c=0.10mm copper. After pressing the tile cover, the thickness of the wire at A is measured as a=0. 1lmm gives the back interference: δ = b+ c /2-a= 0. 10+0. 10 2-0. 11=- 0. Olmm, that is, the secondary tile has no over-profit; instead, there is 0. Olmm gap. This is obviously inconsistent with the installation value of the compressor before leaving the factory. 0. 03~0. 05mm has a large error; and the repeated repeated measurement results are basically the same; therefore, I need to contact the manufacturer to deal with it.
3.3 Measurement methods for open-air plants and numerical values ​​ABC are placed with φ 0. 5mm lead wire; skill workers in open factory. After people arrive at the scene, after tightening the tile cover, tighten the bolts evenly and tightly. Disassembly: measured the thickness of the three lead wires abc and then obtained the back interference δ. After three measurements; the results of the interference value is not counted; see Table 2
Table 2 Open plant personnel measured value item a mm b mm c mm δ (mm first measurement 0. 285 0. 335 0. 330 0. 048 second measurement 0. 220 0. 265 0. 275 0. 050 The third measurement is 0. 295 0. 345 0. 340 0. 048
4. What are the differences between the two measurement methods and the analysis? Two seemingly similar approaches.
The original value of the secondary wattage is indeed 0. 05mm It is reasonable to say that the thickness of the lead wire at point A of the smelting test should be δ = b+c /2-a=0.05mm and the result of the smelting practice is 0. 11mm. And measuring the knot: the fruit is repetitive; conversely imagine the reason. The crux of the problem is the diameter of the lead wire used for measurement and its deformation extension limit. Anatomy [1]; the need to measure the gap of the bearing roof by the pressure lead method The diameter of the lead wire is usually 1.5 to 2 times the value of the void; however, the reason is not clarified; nor does it clarify the requirement for the diameter of the lead wire when measuring the bearing bushing interference. The author thinks; the measurement bushing interference is the same as the measuring bushing top clearance; the same requirement The lead wire diameter is 1. 5 2 times the measured value; this is because the lead wire of a certain standard has its limit of deformation and extension.
The limit value λ of the deformation is about 0. 11mm. Therefore, the thickness of the lead wire of the A point is 0. 11mm instead of 0. 05mm is because it is not deformed when it is pressed to the limit of about 0. 11mm; φ 0. 5m lead wire. Therefore, the measured interference is -0.11mm illusion. Therefore, if the required interference δ is 0. 05mm, the lead wire diameter can be changed to 1.5~2 times the measured value; for example, φ 0. 10mm Can be accurately measured.
Then, after the height is raised, the gap between the top of the bearing pad and the tile cover is 0.11 mm or more. When the lead is pressed, the thickness of the wire is above the limit deformation value; 2 if it is at the two points of BC (λ + δ ) = 0.16 mm or Above) copper sheet. You can also get accurate results.
The pressing force only needs to ensure that the lead wires of the three places are moderately crushed by the upper force; 3 When the ABC is used with the lead wire at three points, if the pressing force is too large; the wire of the two places of BC is pressed to it (λ + δ ) =0.16mm or less; a situation similar to the thickness of the pad with a thickness of 0. 16mm or less is generated; and the result of the fault is obtained.
The author repeated the following tests; aligning the above analysis. Prove the above twist:
Test 1: The result is that the deformation limit value λ is about 0. 105~0. 110mm with two faces pressed φ 0. 5mm lead wire.
Test 2: A is placed at φ 0. 5mm. The wire is retested and overfilled; at BC, 0. 25mm copper is placed on both sides. Obtaining accurate results,
Test 3: After tightening the tightening bolts with a large pressing force; ABC three points each put φ 0. 5mm lead wire. The result is a fault.
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Comparison of two methods for measuring the preload of the bearing bush
Source: China Bearing Network Time: 2018-06-03