Germany FAG bearing temperature causes

FAG bearing temperature , generally bearing chamber outside temperature can be inferred that if the hole can be measured directly using the FAG Bearing outer ring temperature is more suitable position . Typically , FAG bearings with the bearing operating temperature began to rise slowly , 1-2 hours to reach steady state. The normal temperature because of the machine bearing the heat capacity , heat capacity, speed and load are different. If lubrication, install the appropriate department , the abrupt bearing temperature will rise , there will be an abnormally high temperature , time to stop running , take the necessary precautions. Thermal sensors can be readily monitored using FAG Bearing operating temperature , and to achieve the temperature exceeds the specified value to prevent automatic alarm or stop the burning shaft accidents. FAG bearings with high temperature often expressed in unusual circumstances . Temperature is harmful to the bearing lubricant . Sometimes bearing overheating can be attributed to the bearing lubricant . 

If FAG Bearing temperature over 125 ℃ even move to reduce long bearing life . FAG bearings caused by high temperature causes include : lack of lubrication or excessive lubrication, lubricant. Containing impurities, the load is too large, the bearing ring damage , lack of space , and produce high-friction seals and so on. Therefore, continuous monitoring of FAG bearing temperature is necessary , FAG bearings bearing measurements either by itself or other important parts . If the operating conditions remain unchanged in the case of temperature change can be said of any fault has occurred . FAG bearing temperature measurement by means of a regular thermometer, such as digital thermometers , bearing temperature can be accurately measured and determined in accordance ℃ or Fahrenheit units. Importance of FAG bearings , meaning when it is damaged , can cause equipment downtime , so this type of bearing temperature probe should preferably be installed . Under normal circumstances , FAG bearings lubricated or re-lubrication just after the temperature increase will be natural and continuous one to two days . Typically , the operating temperature of 150 ° or more bearings used in high-temperature bearings known as chromium bearing steel in use when the temperature exceeds 150 ° , a sharp decline in its hardness , dimensional instability, so that FAG bearings does not work. So for the working temperature of 150 ° to 350 ° work under conditions of FAG bearings , if the rings and rolling elements still use an ordinary high-carbon chromium bearing steel manufacturing, FAG bearing parts must be carried out on a special tempering treatment should generally be higher than the Operating Temperature 50 ° under tempering . After tempering according to the above requirements of the bearing steel , can be used in the normal operating temperature . But decreased hardness after tempering , 

FAG bearing life decreased. ( 1 ) Clean the heat treatment produced formation water, waste gas , waste salt , dust, noise and electromagnetic radiation etc. pollute the environment . Solution heat treatment of environmental pollution problems , the implementation of clean heat treatment ( also known as green heat treatment ) was developed heat treatment technology development directions. To reduce SO2, CO, CO2, emissions of dust and cinder has basically put an end to the use of coal as fuel , heavy fuel oil usage is less and less in favor of the majority of light oil , natural gas is still the ideal fuel . Furnace waste heat utilization has reached a high degree of structural optimization and the burner air - fuel ratio of the strict control of combustion to ensure reasonable premise , the NOX and CO is reduced to a minimum ; using a gas carburizing, carbonitriding and vacuum heat treatment technology to replace the salt treatment to reduce the waste salt and CN- containing toxic pollution of water sources ; using water-soluble synthetic oil instead of part of the quenching oil quenching , using biodegradable vegetable oil instead of mineral oil to reduce the portion of oil pollution . ( 2 ) Precision Precision heat treatment has two meanings : one is based on the requirements of parts , materials, structure size, the use of physical metallurgy knowledge and advanced computer simulation and testing technology, optimize the process parameters to achieve the required performance or maximize the potential of the material ; hand is fully optimized to ensure process stability , product quality dispersion is small ( or zero ) and heat treatment distortion zero. ( 3 ) the production of energy-saving heat and energy management science is the most efficient use of energy has the potential factors that establish a professional heat treatment plant in order to ensure full capacity , give full play equipment capacity is scientific management options. In the heat energy mix , preference primary energy ; make full use of waste heat , waste heat ; using low energy consumption, short cycle process instead of a long cycle , energy consumption and crafts. ( 4 ) less non-oxidation heat treatment by the use of protective atmosphere heating alternative oxidizing atmosphere is heated to precisely control the carbon potential , nitrogen potential of controlled atmosphere heat after heat treatment to improve the performance of parts , heat treatment defects such as decarbonization, cracks, etc. greatly reduced, heat treatment after finishing allowance reduced, improving the utilization of material and machining efficiency. Vacuum plus hot quenching, vacuum or low pressure carburizing , nitriding, nitrocarburizing and Boronizing etc. can significantly improve quality and reduce distortion , and increased life expectancy . FAG bearing parts heat treatment quality control in the whole machinery industry is the most stringent .

Code of rolling bearing

Codes of rolling bearings by basic codes, codes of front and rear codes, represented by letters and Numbers, etc. The composition of bearing codes are shown in table 9-2.

Note: (1), the basic code of one to five said below code from right to left the position of the ordinal number; Two (2), configuration code such as: / DB said bearing installed (figure 9 to 8 b), back to back/DF said two bearing installed (figure 9-8 a) face to face. 1, basic code consists of bearing inner code and combination code (combination code consists of bearing type code and size series code), used to indicate that the inner diameter of the bearing, diameter, width (or height series) and type, usually expressed in five digits or letters and Numbers, the points above are as follows:

(1) the bearing inner diameter with basic code right on the first and second digits, said such as table 9-3. Note: 1, * inside except for 22, 28, 32 mm; Bearing diameter less than 10 mm bearing code see bearing manual. 2, * * the quotient of nominal diameter divided by five. When quotient to single digits, need to add "0" to the left of the quotient; 3, * * * said directly with nominal diameter (mm), but in between size series and separated by "/" (2) the diameter of the bearing series (that is, the structure of the same diameter and bearing series of changes in outer diameter and width) with basic code right up the third digital representation, see table 9-2. (3) the width of the bearing series (i.e. structure, inner diameter and diameter are the same series of bearings, the wide (or high) degree of changes in the series) with basic code right up the fourth digit said. Series when the width of 0 series (narrow), or the width of 1 series (normal) series, for most of the bearing is not in the code mark width series code 0 or

1), but (2) for spherical roller bearing, tapered roller bearings (3) and (5) thrust ball bearing, the width of the series (or highly series) code 0 or 1 should be marked. Diameter series code and width size code referred to as series code. See table 9-4. (4) bearing type code using basic code right fifth Numbers (for cylindrical roller bearings and needle roller bearing type code by letters), the said method are shown in table 9-1. 2, front-end code used to represent the division of bearing parts, with the letters. If use L said the release bearing separation ring; K said bearing roller and cage components and so on. For example, LNU207 K81107. 3 and post code is to use letters and Numbers, said the bearing structure, the special requirements of tolerance and material, etc., the content of the post code, here are a few commonly used code. Internal structure code is for the same type bearing different internal structure, followed by the basic code with letters.

Such as: contact Angle is 15 °, 25 ° and 40 ° angular contact ball bearings in C, respectively, the internal structure of the different AC and B said. Bearing tolerance grade levels are divided into 2, 4, 5, 6, 6 x and level 0, a total of 6 levels, in turn, from senior to junior, the code/P2, P4, P5, P6, / / P6x and P0. Tolerance grade, grade 6 x applies only to taper roller bearing, a level 0 for regular grade, not marked in the bearing code. Commonly used bearing radial clearance series is divided into 1 group, 2, 0, 3, 4 and 5 group, a total of six categories, radial clearance, in turn, from small to large. Zero clearance is a common set of clearance, not marked in the bearing code, the rest of the clearance group respectively in bearing code/C1 / C2 and C3, C4 and C5 / said. The actual application of the rolling bearing type is many, the corresponding bearing code is also more complex. About the rolling bearing of the detailed code method can refer to GB/T272-93.

Commonly used miniature bearing model

●682●682ZZ●MR52●MR52ZZ●692●692ZZ●683●683ZZ●MR83●MR83ZZ●693●693ZZ●603●603ZZ●623●623ZZ●MR74●MR74ZZ●MR84●MR84ZZ●684●684ZZ●MR104●MR104ZZ●694●694ZZ●604●604ZZ●624●624ZZ●MR85●MR85ZZ●MR95●MR95ZZ●MR105●MR105ZZ●685●685ZZ●MR115ZZ●695ZZ●605ZZ●625ZZ●MR106●MR106ZZ●MR126●MR126ZZ●686●686ZZ●696ZZ●606ZZ●626ZZ●MR117●MR117ZZ●MR137●MR137ZZ●687●687ZZ●607ZZ●627ZZ●MR128●MR128ZZ●MR148●MR148ZZ●688●688ZZ●698ZZ●608ZZ●MR149●MR149ZZ●689●689ZZ●609ZZ●629ZZ●639ZZ●6000ZZ●16001ZZ●6200ZZ

Bearing quality testing

I. bearing quality testing standards a vibration. Vibration acceleration national standard (commonly known as the Z scale) of the earlier standards, to measure the rotation of the bearing vibration acceleration values ??to determine the bearing quality grade, divided into Z1, Z2, Z3 from low to high three quality grades. Domestic bearing manufacturers are still in use, in order to measure the bearing vibration acceleration values ??the merits, just simply reflect the bearing fatigue life. 2. Vibration velocity standard (commonly known as the V mark) since the original vibration acceleration standard has not been abolished, so that the standard is based on mechanical industry ministerial standards emerge, is the reference to European standards combined with China's actual situation and the need to develop in order to detect bearing vibration velocity divided by Bearing quality level (equivalent to the national standard). Into V, V1, V2, V3, V4 five quality levels. Various ball bearing quality level from low to high as V, V1, V2, V3, V4; roller bearings (cylindrical, conical) quality level from low to high as V, V1, V2, V3 four quality levels. It is based on detecting bearing different frequency bands (low, medium, high) to reflect the speed of the vibration b bearing quality. Bearings can be roughly analyzed whether there geometry problems (such as rims oval), roller / rolling quality problems, quality problems cage, to examine the vibration acceleration than to have a significant bearing quality improvement. Domestic exports to Europe bearing, our military and aerospace industries are in accordance with the standards for bearing quality testing, and testing the quality and resolution of the European imports of counterfeit bearings imported bearings provide a viable means. KOYO bearing inspection, bearings, skf bearing, nsk bearings, fag bearings, IKO needle roller bearings bearing quality testing currently exist two standard parallel situation, while "Z standard" bearing a high quality level to "V standard" detection may not have a good quality of performance, there is no correspondence between the two. This bearing quality testing is to pay special attention. KOYO bearing inspection, bearings, skf bearing, nsk bearings, fag bearings, IKO needle roller bearings two. Detect the vibration measuring instrument bearings used in the operation, ISO2372 standard although they are vibration velocity to determine whether the excessive vibration, but practice in the field with special attention to the bearing acceleration value changes, mostly bearing damage during the initial presentation of fatigue damage, this can generally be expressed as apparent acceleration increases, along with the development of fatigue, the gradual emergence of vibration velocity and displacement elevated, indicating that in bearing fatigue damage. Especially for bearing detection, careful attention to whether the value of unstable vibration swing (recommended analog pointer instrument, you can observe the very obvious), if there is swing, heralded the emergence of unstable vibration signals, acceleration also great, especially the speed while increasing, is likely to exist bearing "playing sets of" fault. KOYO bearing inspection, bearings, skf bearing, nsk bearings, fag bearings, IKO needle roller bearings for new equipment, testing and acceptance, although the vibration is very small, in line with national standards, but in the bearing parts appear small amplitude vibration swing phenomenon, exclude bearing with the problem (playing sets), the most likely bearing geometry problems, such as bearing steel ring oval, rolling through the major axis position, the gap may be due to reduced rolling moment stuck causing the subsequent rolling continue to squeeze, so that sliding friction rolling, rolling each one will appear in this sliding friction, resulting in unstable signal appears.

This problem is detected Shanxi 220KW new motor encountered, the disintegration of detectors to detect bearing, proved entirely correct judgment. KOYO bearing inspection, bearings, skf bearing, nsk bearings, fag bearings, IKO needle roller bearings Special Note: When checking bearings, we must not ignore the bearing acceleration values ??change. Better able to predict the acceleration of early bearing failure. Three. Domestic bearing quality testing of reference 1. Domestic bearing manufacturers product quality analysis reference (through the actual test statistics, under the premise of guaranteed genuine) ① deep groove ball bearings: Wafangdian Bearing Company, Harbin Bearing Company, Luoyang Bearing the company's product quality and performance is still good. ② Cylindrical roller bearings: Zhejiang Tianma Bearing Company's quality is better. ③ Tapered roller bearings: After the actual detection experiments and exploring the national quality inspection center bearing, currently only money flows, Zhejiang Wanxiang Group and Fujian I megabytes group bearing quality acceptable. ④ angular contact ball bearings: Currently Harbin bakelite bracket bearing quality is acceptable. Four. Bearing quality testing analysis reference KOYO bearing inspection, bearings, skf bearing, nsk bearings, fag bearings, IKO needle roller bearings imported bearings quality inspection, the Japanese model of Authenticity bearing quality is still good; but finds a famous bearing quality not ideal, because the country is not the company bearing basic local production. On nominal origin Malaysia and Australia The grade bearing inspection found that its quality is far from ideal, even as regular domestic manufacturers of genuine bearings. KOYO bearing inspection, bearings, skf bearing, nsk bearings, fag bearings, IKO needle roller bearings Tip: Currently all forms of double row rolling bearings and pure axial thrust bearing countries do not have the appropriate testing standards. For angular contact ball bearing axial load to meet the requirements, you can see deep groove ball bearing quality level.

FAG bearing clutch analysis

Clutch bearings during operation revealed failure is common, so do not fuss of. Revealed a failure, determine and dispose of is the key.

 1 FAG bearing temperature is too high at the institutional operation, install the bearing parts allow a certain temperature, when the hand stroked body shell, should not feel hot as normal, in contrast indicates that FAG bearing temperature is too high. Bearing temperature is too high Duanyou include: lubricating oil quality undesirable or deterioration, lubricating oil viscosity is too high; institutions assembly too tight (the gap is not sufficient); clutch bearing assembly tight; bearing ring on the shaft or housing rotation; load is too large; FAG Bearings maintain shelf or Gulu body fragmentation.

 2 FAG bearing bearing noise permitted in the office rang children have tiny operation, if loud children too large or unusual noise or crash, it indicates that the bearing has failed. Gulu bearing noise terminus initiation complex, one of the bearing, the outer ring suitable for exterior wear. Because this kind of wear, damage the clutch bearings and housings, bearing an appropriate relationship with the axis, causing the axis out of the way of the exact position of the shaft at high speed movement initiation abnormal sound. When the bearing fatigue, its exterior metal flake, but also make the bearing radial clearance increased initiation of abnormal sound. Besides this, the bearing lubricant is not sufficient to form a dry friction, and bearing broken and so will the initiation of abnormal sound. FAG Bearings wear Songkuang, the maintenance of aircraft destroyed relaxation also sprouted abnormal noise bearing damage. Gulu Bearing Removal investigation, it can do damage to the bearing condition based on judgment and destruction Duanyou bearing failure. 1 bearing raceway spalling Gulu exterior metal body and the inner and outer ring raceway surface are assumed periodic pulsating load effect, and the initiation of contact stress cycle changes. When the number of stress cycles back up to a certain figures in Gulu body or the outer ring raceway surface on the initiation of fatigue spalling office. If the bearing load is too large, this fatigue worse. Additional, clutch bearing is not properly installed, the shaft buckling, also sprouted raceway spalling. FAG bearing raceway fatigue spalling will reduce the shaft rotation precision, enables organizations to oscillate and noise. 2 Bearing burning burning clutch bearing its raceway, Gulu has tempered the body color. Burning Duanyou ordinary is not enough oil, lubricating oil or undesirable quality deterioration, and bearing assembly too tight and so on. 

3 Van variants in bearing raceway and roller contact surfaces are exposed warp pits sprouted normative interpretation to understand bearing variants. Which end is the clutch bearing static load or a very large impact load utility, the office part of the appearance of the bending stress exceeds the limit, such a thing occurs in low-speed rotation condition of the common bearing. 

4 FAG bearing ring bearing ring crack initiation crack terminus may be appropriate bearing too tight, clutch bearing abnormal or inner relaxation, FAG bearings assimilative pieces variant, installation of bearings such as poor appearance processing. 5. Maintain its terminus frame fragmentation is not enough oil, Gulu body broken, crooked seat and so on. 6 to maintain a metal frame attached to the body Gulu terminus possible Gulu body is stuck in the rack to maintain or oil is not sufficient. 7 seat ring raceway severe abrasion may fall into the foreign body is the seat of the circle, lubricating oil or lubricating oil grades are not enough suitable match.

SKF bearing vibration noise sources [

Question one: SKF bearing vibration of the main factors which? Answer one: SKF bearing vibration has two main sources:

 First, SKF bearings SKF bearings caused by external incentives inherent vibration means SKF bearing inner ring, outer ring, rolling elements and cage the natural vibration. Second is due to contact between moving parts forced vibration caused by the collision, including the rolling sphere is not ideal, inside and outside the channel contact point trajectory is not a perfect circle (roundness, waviness), the raceway is not the ideal smooth surface (roughness) and the rolling elements and cage in motion collision and lubricants in the forced vibration caused by impurities, vibration and sound are closely related. For general SKF bearings, recommended to concentrate the limited human and financial resources improve SKF bearing vibration control. Quality standards should not separate the noise, of course, according to foreign experience, especially for products such as computer hard drives, CD-ROM drive system VCR SKF bearings, vibration assessment is not easy to use, can develop standards to assess noise measurement method.

TIMKEN bearing swivel density

TIMKEN bearing size of the load of the load bearing ring under the action of the radial component, which may be compressed radially, with loose lead, especially in the case of the load transfer back, prone to slipping. Therefore, for heavy-duty applications should normally be lighter than normal loads and loads of occasions with some more tight. In short, the heavier the load, the amount of interference should be greater. ③ Operating temperature bearings in operation since ferrule working temperature is usually higher temperature than the adjacent parts, the bearing inner ring may be due to thermal expansion and loosening of the bearing outer ring may be due to thermal expansion affect the bearing axial clearance, so In selecting the fit, you must pay attention to consider the temperature difference between the ferrule and the thermal conductivity direction. ④

 When TIMKEN bearings rotating precision rotating accuracy and smooth running higher, in order to eliminate the elastic deformation of the bearing parts and vibration, due to the amount of avoided clearance fit. ⑤ shaft and housing structures and materials if the shaft and housing (box) open hole surface irregular, will lead to bearing inner and outer rings is not properly deformed and discontinuity. Folio-style case (box) body, and the bearing outer ring with the interference fit should not be used, they should not make the outer ring in the housing (box) hole rotation. When the bearing mounted in thin-walled, light-alloy casing (box) hole or hollow shaft, bearing in order to ensure adequate bearing surface should be used than installing the thick shell (case) body, cast iron housing (box) or solid body with the selected axis bear more. ⑥ installation and removal of applications in many complex structures, in order to facilitate the installation and removal requires the use of clearance fit. According bearing operation conditions, such as interference fit must be used during installation, you can use the separation of bearings (inner and outer rings can be installed in a cylindrical roller bearings, needle roller bearings, tapered roller bearings and thrust bearings) or tapered bearing bore, can easy handling. ⑦ non-fixed end bearing axial displacement of this displacement is to be installed in non-fixed side bearing a ring in the axial direction can have some swimming gap. Usually a fixed load ferrule (usually outer) with clearance fit installation. If the file using the inner or outer side of the cylindrical roller bearings (2000 and 3200) or needle bearings installed in the non-fixed end, the inner and outer rings are made of interference fit. (2) conical inner bore bearings tapered bore bearings, the installation and removal more convenient, can be installed directly on a tapered journal or outside in the middle of a conical cylinder sleeve (adapter sleeve, withdrawal sleeves), and then mounted on the side of the intermediate sleeve with a cylindrical shaft. Bearing outer ring and housing (box) hole with cylindrical bore bearings with the same rules. With adapter sleeve or withdrawal sleeve non-separable bearings, large bearings for tolerance, but the axis of geometric tolerances must be strictly controlled.