Ball Bearing Clearance Information

Posted on February 13, 2012 by admin

The choice of bearing products involves many different aspects. One of them is the bearing clearance. It is the interval that exists between the balls and the inner and outer races of the bearing. Clearance is important for a bearing as it can have an effect on bearing life and other factors related to the cohesiveness of the bearing.

The bearing clearance of a ball bearing is a measure of the geometrical space between three parts, i.e. outer ring, ball, and inner ring. Different clearances may have different functions and features. It is very important for you to choose the proper bearing products. Therefore, before selecting your Spherical Plain Bearings, it’s important to have an understanding of what kind of clearances you are working with. Many things are related with clearance choices.

There are different kinds of clearances. As to the ball bearing clearance, it is necessary to make a distinction between axial and radial. Generally, the axial clearance refers to the space between ball and races parallel to the bearing access, while the radial clearance refers to the give between ball and races perpendicular to the bearing axis.

International code classifies bearings into one of six clearance groups: C1, C2, Normal, C3, C4 and C5. Internal clearance determines Planter Bearings classification. C1 and C2 are minimum load clearance bearings. Normal load clearance bearings are used for most applications. C3, C4 and C5 are maximum load clearance bearings.

The shaft and housing you choose will determine the amount of clearance you experience with your ball bearing which is known as the “fit”. An interference fit is one in which there is virtually no play between the parts. In a loose clearance fit, there is a great deal of play within the parts.

Load clearance should also be taken into consideration. Dynamic load rating includes rotational stress under load. Load conditions must include average duty, a range of loads or peak loads. Static load ratings apply to bearings rotating at less than 10 revolutions per minute, oscillate slowly or remain stationary under load.

Extremely short duration loads must be calculated because short duration loads may damage the bearings surface. External forces from the transmission of power, rotating shafts or inertia are included in load calculations. Basic calculations assume constant load or dir

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The Development of Ball Bearing Manufacturing Process

Posted on February 7, 2012 by admin

Ball Bearing

At present, China deep groove ball bearings and seal products advanced internal structure parameters are almost the same, but such products in China the level of vibration and noise are very different and foreign products, mainly in the manufacturing and working conditions and factors. From the bearings industry point of view, condition factors can make reasonable demands on the host to solve, and how to reduce vibration caused by the manufacturer and the noise factor is the bearing industry must be addressed.
Many domestic and international tests show that: the cage, ring, ball bearing vibration processing quality of different degrees, of which the processing quality of ball bearing vibration on the most significant, followed by the ring of processing quality, the main effect factor is the ball and ring roundness, waviness, surface roughness, surface Kepeng injury, etc..
Ball products in China’s most prominent problem is the value of discrete vibration large, severe surface defects (single point, cluster points, pits, etc.), even though the surface roughness, size, shape, error levels are not lower than the outsider, but the co-sets After the bearing vibration value is high, or even create different tones, the main problem is that waviness does not control (no standards, no suitable test and analysis equipment), an indication of poor machine vibration, grinding, grinding disc, the cooling fluid, process parameters have a problem ; on the other hand to improve the management level, to avoid the bump hurt, scratches, burns and other machines of quality problems at any time.
For rings, the most serious impact of bearing vibration is channel waviness and surface roughness. For example, the small and medium sized deep groove ball bearings inside and outside the channel is greater than 2m circle, the vibration of bearings will be obviously affected by internal and external channel ripple is greater than 0.7m, the bearing vibration value with the increase of waviness, a serious channel 4dB increase of vibration injury knock over, or even different tone.
Both balls or rings, waviness resulting from grinding, Superfinishing Although it can improve the waviness and roughness decreased, but the most fundamental measure is to reduce the ultra-fine grinding process of waviness, to avoid random knock injury, there are two main measures:
First reduce the rolling surface of the vibration when the ultra-precision grinding, get a good surface finish quality and shape accuracy and surface texture to reduce vibration, grinding machine to be super good vibration resistance, and other important structural parts bed with absorber, super precision machine tools whetstone oscillation system with good anti-vibration performance; second is to increase grinding speed, grinding abroad outside 6202 60 000 commonly used roller spindle, grinding speed of 60m / s or more, domestic general much lower, mainly due to performance of the main bearing spindle and restrictions. In the high-speed grinding, the grinding force is small, thin grinding deterioration is not easily burn, but also can improve the machining accuracy and efficiency, low noise ball bearing great influence; spindle static and dynamic characteristics of stiffness and speed of ball bearings for low noise great influence on grinding vibration, stiffness and the grinding speed on the grinding force of the change is not sensitive to vibration of the smaller grinding system; increased spindle bearing support stiffness, random balancing technology to increase the grinding spindle vibration sex. Foreign grinding vibration speed (such as Gamfior) is about one-tenth of the domestic general spindle.

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Reducing the noise of deep groove ball bearings

Posted on January 30, 2012 by admin

Deep Groove Ball Bearings

At present, China’s low-noise bearing products with foreign advanced level, the gap is large. To improve the product level, relevant departments to carry out technical research activities, strength, and achieved good results, which for the Chinese production of power from a Major bearing manufacturers have played a positive role in changing miniature deep groove ball bearing vibration (noise) Detection and analysis and sealed performance test is “95″ during the China Bearing Industry Association, low-noise deep groove ball bearings research plan and the implementation of a comprehensive system of inspection and acceptance. Not long ago, the panel 17 major bearing on the domestic bearing manufacturers were examined and accepted, the move to understand the current development of China bearing industry, a clear direction of future development and improve the overall level of China bearing industry, to promote China’s largest producer of the bearing production of power transfer to the bearing {TodayHot} change has important practical significance.
17 through the main bearing on the domestic producers of a comprehensive assessment of product performance, the Group agreed that, tai Group Co., Ltd., China Star Entertainment Group, one of the Group Ltd., Co., Ltd. Zibo Huatian comprehensive assessment of the best results. Most comprehensive assessment of the results of good enterprise, small business comprehensive assessment of the results is poor. Appraisal results indicate that, compared with pre-made low-technology research bearing the overall level of noise has been greatly improved, including vibration, sound no different from the passing rate, accuracy rate and other key performance indicators of reserves has been significantly improved. Some business performance over foreign NSK, NTN’s kind of similar products level.
This shows that the “95″ during a series of technical research achieved remarkable results, in a sense, technology research bearing a strong impetus to the domestic industry development and technological progress of enterprises. In this comprehensive assessment, the selection of the tai Group Co., Ltd. and other four low-noise bearing production board companies enjoy a high reputation in China, these companies have their own characteristics, low noise bearings in the development and production development has done a lot of work, and have achieved encouraging results. These enterprises are able to in the fierce market competition, that is able to steadily improve product yield, but also has expanded each year the output value and sales, and these companies have excellent products are inextricably linked. Test analysis, the company’s products have several characteristics.
First, with good vibration performance. Vibration (speed and acceleration) value is low, Z4-2dB and V3 group pass rate, the peak vibration acceleration is small, the mean crest factor <5, the vibration velocity and acceleration results showed normal distribution, dispersion small.
Second, the same ratio of high pass rate sound. Achieve a higher pass rate is no different sound levels, the product is no different from the sound of not less than 88% pass rate.
Third, the sealing performance. Sealing performance reached a higher level, there is an indicator of poor business bearing the dust, but the temperature rise and grease leakage rate of 100% qualified, the other three companies of dust, grease leakage and temperature rise 100% all three indicators qualified.
Fourth, the reserve has a good accuracy rate. Dimensional accuracy and rotation to achieve 100% accuracy level P6, P5 level reached 90%, P4 level is also a high proportion. Dimensional accuracy and precision rotation results are {HotTag} normal distribution, process capability index is better.
Fifth, the radial clearance control is reasonable. In accordance with the requirements of low-noise bearings are radial compression clearance, clearance value selection is reasonable, finished uniform deep groove ball bearings clearance, clearance process capability index is good.
Sixth, part surface quality. Anatomy of the finished bearings, test ring channel roundness, waviness, roughness, roundness test results (2-15) to less than 0.5μm, (15-500) to 0.06μm, roughness 0.03μm or less, have reached a higher level of surface quality. China bearing technology research is a long-term continuous systems engineering. “95″ during the research work has achieved certain results, but there are many important issues to be resolved, such as bearing unusual sound control and improve the bearing seal properties. Timely resolution of these issues will be domestic bearing industry has played an active role in promoting.
Currently, foreign NSK, NTN, NMB, SKF and other low-noise bearing the company’s leading product in the world, such as NSK’s ultra-quiet MCR silent and MCF bearing, SKF’s Q55 and Q66-motor bearings, NMB’s boutique low-noise bearings are world-class low-noise bearings. Mute with the international bearings bearings and ultra-quiet compared to the best-made low-noise bearing products with NSK’s motor bearing only the CM level quite away from the quiet and ultra-quiet bearing is still a big gap. According to the test results, combined with development status and bearing low-noise bearings with reference to existing international standards, the next phase of the domestic bearing industry to solve problems and achieve the following aspects. Bearing abnormal sound control, improve the passing rate is no different sound; improved bearing seal performance, improved bearing seal structure; improve process capability index finished bearing vibration; develop silent and ultra-quiet deep groove ball bearings; to improve the accuracy of the finished product bearing reserve ratio ; in the next five years, made fine low-noise bearing vibration and noise to the motor bearings NSK’s grade level of CMF; made the same sound of low-noise bearing more than 90% pass rate;-made low-noise performance of the bearing seal close to the international the late 1990s, the advanced level.
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The history and structure of Agricultural Chain

Posted on January 9, 2012 by admin

Agricultural Chain

Renold’s history:

 

In 1879, Mr. Hans Renold invented the world’s first sleeve roller chain, containing a new industry was born. It is a UK listed company for the global production chain and other customers to design power transmission products, a chain industry leader, manufacturing facilities in Britain, France and Germany the United States, Australia Poland Malaysia and China, and in 23 countries have set up sales companies, agents and distributors network covers more than 60 countries. chain of product sales accounted for 70% of the entire group , set up factories in Hangzhou, China, specializing in the production of industrial chains (standard and non-standard roller chain), motorcycle drive chains, agricultural chain, Cornhead Gathering Chain, FLT chain, heavy chain and conveyor chains.

 

Renold’s structure:

 

Parts of a standard chain from the inside and outside the chain sections. It by the board within the chain, the chain plate, pin, sleeve, roller five small components, the chain hinges on the pin and sleeve.

 

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What is Deep Groove Ball Bearings

Posted on December 31, 2011 by admin

Deep Groove Ball BearingsBall bearing is one kind of roller bearings, rolling balls are kept between the inner steel ring additionally, the outer steel ring, so it can withstand higher loads. Why Stars all Buy auto parts ? Who Knows! It could be additionally known as rolling ball bearings. New auto parts Drift in September Ball bearings are primarily constituted by the 4 fundamental components, that is, the ball, the inner ring, the outer ring and cage or retainer. Believe it or not, auto parts is My Mother’s Favorite! Ball bearings for general industrial use have to meet the AISI 52100 standards, the ball and the ring are normally produced with chrome steel, Rockwell C-scale hardness is between about 61 to 65. auto parts , the Necessity of Love for in Fall While the retainer’s hardness is lower balanced with the ball and the ring, its material has metal (as an example: carbon steel, aluminum) or nonmetallic (such as: Teflon, PTEF, polymer materials). Ball bearings have smaller rotating friction than journal bearings, so beneath exact same speed, the temperature maded by the friction may be comparatively low. Deep groove ball bearing’s inner and outer ring raceways are shown as the arc-shaped groove, the channel radius is rather larger than the ball’s radius. It really is principally familiar with bear radial load, however it likewise can withstand a specific axial load. When the bearing’s radial clearance is increased, it will have the function of angular contact ball bearings, it can bear big axial load, it may be furthermore proper for high-speed rotation. When the bearing is relative tilt 8 ‘to 16′ between the housing bore and shaft, it can still work, but it could impact its service life. And underneath the conditions of high speed and it ought to not use a pushing ball bearings, individuals can use such bearings to bear the pure axial load. Deep groove ball bearings are usually utilized 1 steel cage which is synthesis of two parts stamping, nonetheless the big size or high-speed bearings make use of the solid cage, this cage is guided by a ball the exact same as the punch cage, the high-speed deep groove ball bearings’ cage is far more usually than not guided by the inner or outer wall. In comparison to the exact same size of other types’ bearings, deep groove ball bearing has little friction, vibration and noise are moderately low, speed is extreme high, precision is high, so it genuinely is the 1st chosen bearing type when users are picking bearings. Nonetheless, such bearings cannot tolerate impact, and it genuinely is not suited to bear a heavier load. Deep groove ball bearing’s structure is easy and it is straightforward to utilize, it genuinely is 1 sort of bearings that uses the greatest production volume, it is most vastly employed. It’s commonly utilized in vehicles, household electrical appliances, machine tools, motors, pumps, agricultural machinery, textile machinery and a lot of other fields.

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What are Needle Roller Bearings

Posted on December 26, 2011 by admin

Needle Roller BearingsNeedle roller bearings are the roller bearings with cylindrical roller, compared with its diameter, its roller is both thin and long. The Most Predominant auto mirror glass in October: 10 Excitingly Attractive Fashion Such roller is known as as the needle roller. Blanchette also Love Prime car rear view mirror Despite this bearing has smaller cross section, it still has a higher load bearing capacity, for that reason, it genuinely is particularly outstanding for the occasion where the radial space is limited.The needle roller’s contour surface is fairly contracted near the proximal surface. The modified result of the contact between needle and roller line can stay clear of producing the destructive edge stress. The 1 that’s supporting the needle roller bearing is thick-walled outer ring, via the high temperature nitrogen quenching, high-precision roller is guided by the high rigidity outer ring’s wall, by utilizing the linear contact, wheel can directly and easily spin on the raceway, and this can possilby bear huge load. So that you can remove the stress, the outer ring which is supported the raceway is utilized the arc design, curve raceway has the single wheel, double seals, non-seal, seal rings and also other specifications. The bearing with seal ring has the huge space to store grease, in order that it can supply lengthy time lithium grease lubrication, and extend the lubrication intervals. The seal ring is produced from nitrile rubber with the skeleton or ST12, its operating temperature range is from -30 °C to 100 °C or from -30 °C to 180 ° C. The sealed curve raceway can withstand very heavy loads and high end performance operation.Needle roller bearing is armed with thin and long roller(the roller’s length is three to 10 times of the diameter,the diameter is commonly not more than 5mm), so the radial structure is compact, when its inner diameter size additionally, the load capacity are the same with other styles of bearings, its outer diameter is minimum, so it’s especially ideal for the supporting results of the restricted radial bearing mounting dimensions. Dependent upon different occasions, people can pick the needle roller bearing without inner ring or the needle roller without needle roller and cage assemblies, at this moment, the journal surface also, the shell holes’ surface which are matched with the bearing can directly used as the inner and outer raceway surface of bearing, so that you can ensure the load capacity and operational performance match with the bearing with the ring, the shaft or shell bore raceway surface’s hardness, machining accuracy and surface quality ought to be parallel to the bearing rings’ raceway. Such bearing can only bear radial load.

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Something about Thrust Ball Bearings

Posted on December 19, 2011 by admin

Thrust Ball Bearings

Ball bearing is among the most widely used kinds of bearing items. They may be produced from different materials for example stainless, stainless-steel and ceramic, etc. Individuals produced from different materials get their own functions and qualities. Truly, ball bearing are manufactured from the steels though these components has numerous disadvantages. The steel-made ballbearings are extremely hard and powerful. They are able to bear more pressure than normal. Besides, they’re relatively less expensive than other forms due to the reduced price of creating the balls utilized in the bearing.

 

Generally, you will find two fundamental kinds of ball bearings, i.e. radial and thrust. Although both are made to carry one sort of primary load, with respect to the specific bearing design, they might also have a variety or mixture of loads.

 

Radial ball bearings are most likely probably the most broadly used and many recognized ball bearing. These bearings have one row of balls (known to like a single row), which is all about the ball path. This feature provides them another title. They’re generally known as deep groove ball bearings. Although made to mainly carry radial loads, a radial ball bearing’s raceways are deep enough that it may also carry reasonable thrust loads. Radial ball bearings are made to carry mainly a radial load. Whenever a pure radial load is used towards the bearing, the balls settle towards the greatest reason for the raceways and also the load is moved with the rings and balls where they contact each other. These points of contact produced inside the bearing is going to be verticle with respect towards the shaft.

 

Angular contact ballbearings are called single row, radial ballbearings. Unlike other radial ballbearings, the contact points with the angular contact bearing are measured when it comes to what lengths they deviate in the normal pure radial load (in a 90? position towards the shaft). They are equipped for the balls to ride high in fringe of among the raceways: the raceway on the other side from the outer ring is a lot shorter to support set up. If they’re installed facing the incorrect direction, they’ll separate and create a catastrophic premature failure.

 

Thrust ball bearings are made to have a pure type of thrust (axial) loads. Whenever a load is correctly put on this bearing, the interior contact points are aligned on the plane parallel towards the shaft. Radial loads will dislodge the balls using their track and make the bearing to split up. This type of bearings is principally produced in two designs, single direction and double direction designs.

 

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How to choose Tapered Roller Bearings

Posted on December 12, 2011 by admin

Tapered Roller Bearings

As a key component of the machine spindle, its performance will directly affect the rotation of the machine precision, speed, rigidity, temperature and noise parameters, and thus will affect the quality of workpieces, such as parts of dimensional accuracy, surface roughness and other indicators. Therefore, in order to maintain excellent machining capacity, must be equipped with high performance bearings. For machine tool spindle bearing on the accuracy should be ISOP5 or more (P5 or P4 is an ISO level of accuracy, usually from low to high for the P0, P6, P5, P4, P2), while for CNC machine tools, machining centers, high-speed, high-precision machine tool spindle bearing, you need to use ISOP4 or more precision; spindle bearings including angular contact ball bearings, tapered roller bearings and cylindrical roller bearings and other types.

 

In the above types of bearings, angular contact ball bearings with precision the most widely used. We all know that angular contact ball bearings rolling the ball; because it is a point contact (as opposed to roller bearings line contact), so it can provide higher speed and smaller heat and higher spin accuracy. In some ultra-high-speed spindle applications, but also the use of ceramic balls (typically Si3N4 or Al2O3) hybrid bearings. With the traditional full hardenability than steel balls, ceramic balls gives the material its own characteristics ceramic ball bearings with high stiffness, high speed, high temperature, long life, high-end customers to meet the demand for machine tool bearings.

 

Because the choice of pre-loaded angular contact ball bearings for precision applications is very large, for example, in high load, high rigidity of the occasion, usually use medium or heavy bearing preload; and for some high-speed, high-precision applications , early in the bearing selection, the need to pay attention to choose the right preload, generally the more common light preload. Preload is generally divided into light, medium, heavy-duty three; for the convenience of the customer’s use of the world’s few major bearing manufacturers generally provide pre-grinding bearing face and bearing preload increases, that is, we usually refer to universal matching precision angular contact ball bearings in the form. Eliminating the need for such bearing preload adjustment customers, saving installation time.

 

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How to choose Agricultural Bearings

Posted on December 5, 2011 by admin

Agricultural Bearings

Agricultural Bearing axis of rotation of various mechanical or moving parts of the supporting parts are widely used in agricultural vehicles, tractors, diesel engines, motors, threshers and other agricultural machinery. Purchase bearings bearings commonly used code, but the bearing code more complicated, and if the farm hands to master the law of identification bearing code to purchase on easy.

Agricultural Bearings are a little ordinary common standard model, code-named “0″, tolerance levels for the “G” (normal level), the general bearing of the first paragraph can not write, so the code more than seven digits to express the basic code. An example is explained to understand the meaning of the bearing code: Example 7002136 (135 series engine main shaft bearings of light), the basic code from right to left in order to identify, SKF bearing. “36″ double-digit expression of light, the calculation is 36 × 5 = 180 mm; “1″ to express the diameter series special light; “2″ to express the type cylindrical roller bearings; “00″ way to express the bearing outer ring structure no ribs; “7″ series for the narrow width of the expression. If the machine hand to buy other standard models bearing 7-digit code can be funded and so on. Optional multi-reference bearing diameter bearings, bearing ID code used in the basic right first, second digit expression. Sub-standard and non-standard bearing bore diameter, the difference is not a flat non-standard ID number or integer multiples of 5.
Convenient option for the machine hand, SNL housings are an example to explain to understand:
① Bearing inner diameter of 9 mm below the right end of the first number with the actual size of the expression. For example, bearing No. 18, the inner diameter of 8 mm.
② bearing 10-17 mm in diameter with a fixed number of expression. For example, bearing No. 100,201,302,403, its diameter two-digit code unless the right is 00,01,02,03, unless it is 10,12,15,17 mm diameter fixed digital expression.
③ Bearing inside diameter 20-480 mm (22,28,32 are excluded), in addition to diameter size from number 5 expression.
④ bearing inner diameter of 500 mm (22,28,32) with the scores expressed in the denominator expression diameter, the size of molecule expression bearing series, type and structure of the way. For example, bearing No. 30031/560, the inner diameter of 560 mm, other are provided on.
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How to identify the type of SKF Bearings

Posted on November 29, 2011 by admin

Here’s a simple analysis:
First, the size limit.

The installed space of SKF bearings usually is restricted. In most cases, the shaft (or SKF bearing diameter) is based on mechanical design or other design limitations. Therefore, SKF Bearing type and size selection is based on SKF bearings diameter of the decision.Thus, the standard SKF bearings are the main dimensions table diameter size according to international standards prepared.

Size standard SKF bearings in many forms, preferably in mechanical devices designed to use standard SKF bearings (SKF bearing this design to the ease of procurement, where you tell the way, SKF Bearing catalog on some models do have, but some Non-standard SKF bearings in mainland China not in stock, futures will be a long time sometimes, so the selection of the SKF bearing the cost and time to consider the latter part of the cost of replacement) SKF bearing the load applied to the SKF bearing on the load, the nature, size, direction is changing. Typically, the basic load ratings are shown in table size.However, the axial load and radial load, etc., also select the appropriate SKF bearing important factor. SKF ball and roller bearings when the size of a considerable time, SKF needle roller bearings usually have a higher load capacity and withstand greater vibration and shock loading.

Second is speed.

Permissible speed is based on SKF bearing type, size, precision, cage type, load, lubrication, cooling method and other factors identified. SKF Bearing accuracy table lists the standard SKF bearings in oil lubrication and grease lubrication of the allowed speed. Typically, deep groove ball bearings, self-aligning ball bearings and cylindrical roller bearings are suitable for high speed applications.

Once again, SKF bearing tolerances.

SKF bearing size precision and rotational accuracy is based on ISO and JIS standards.For applications requiring high precision and high speed machinery, recommended five or more precision SKF bearings, deep groove ball bearings, angular contact ball bearings or cylindrical roller bearings are suitable for high precision mechanical operation. Rigidity, when the SKF rolling bearings and roller contact surface pressure, will produce elastic deformation. Some machines need to minimize elastic deformation. Than ball bearings roller bearings have a small elastic deformation.

In addition, in some cases, SKF bearings to preload to increase rigidity. This process typically used for deep groove ball bearings, angular contact ball bearings and tapered roller bearing inner ring offset, shaft bending, or SKF bearing box shaft tolerance changes, inside and outside the circle with the error will lead to the eccentric. To prevent the eccentric angle is too large, self-aligning ball bearing, self-aligning roller bearings SF, or self-aligning bearing is the better choice. Voice frequency and torque, bearing standards are based on high-precision manufacturing, so the voice and the torque is small. Deep groove ball bearings and cylindrical roller bearings are suitable for low voice, low-torque applications with special requirements.

Installation and removal, some applications require frequent removal and installation, to ensure regular testing and maintenance. Can be installed inside and outside the ring, such as SKF bearings: cylindrical bearings, needle bearings, and tapered bearings are available for this occasion. Cone hole of auto-aligning ball bearings and roller bearings self-aligning with the help of the sleeve, also simplifies the installation process.

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