Why do so many industries need to needle roller bearings?

Needle roller bearings are widely used at present market is very hot, and 

in this process, the field of machine tools use some relatively wide.

Scope of application: this bearing needle roller bearings are used for 

gearbox, motorcycle, automobile, the small end of connecting rod. Gear. 

Because the cylinder temperature reducer, increase, so the bearing high 

temperature. With thin and long needle bearing roller (roller length is 

3~10 times the diameter, the diameter is generally not more than 5mm), so 

the radial structure is compact, its diameter size and load capacity 

compared with other types of bearings at the same time, minimum diameter, 

especially for radial installation support results in limited size. 

According to the use of different occasions, can be used without inner ring 

bearings or needle roller and cage assemblies, the shaft neck surface and 

the surface of shell holes matched with a bearing directly as bearing inner 

and outer rolling surface, to guarantee load capacity and operating 

performance and have the same ring bearing, shaft or housing holes raceway 

surface hardness, the machining precision and the surface quality of 

bearing ring raceway and similar.‍

common classification methods of rolling bearing:

1 according to the rolling bearing structure type classification

(1) according to the loading direction which can bear or nominal contact angle is different, is divided into:

1) radial bearings - important for rolling bearings bear radial load, the nominal contact angle from 0 to 45. According to nominal

The contact angle is different, can be divided into: radial bearings - Nominal

The contact angle for radial bearing 0: angular contact radial bearings - nominal contact angle is larger than the radial bearings 0 to 45.

2) - an important thrust bearing used in rolling bearing under axial load, the nominal contact angle greater than 45 to 90. According to the public

Said contact angle different is divided into: axial contact bearing, male

Said contact angle for thrust bearing 90: thrust angular contact bearings, nominal contact angle greater than 45 but less than 90 of the thrust shaft

Bearing.

(2) according to the rolling bearing varieties, divided into:

1) ball bearing, roller ball:

2) roller bearings, roller roller. Roller bearing press roller variety, can be divided into: cylindrical roller bearing.

The rolling bearing cylindrical roller, cylindrical roller and the length of the straight

The ratio of diameter less than or equal to 3; needle roller bearings, needle roller bearing is a rolling body, the needle length to diameter ratio

In 3, but the diameter is less than or equal to 5mm; tapered roller bearing

- the rolling bearings tapered roller; roller bearings by the rolling bearing spherical roller.

(3) aligning whether according to their task, divided into:

1) aligning bearings, raceway is spherical shape, can adapt to the two bearing raceway deviation angle between the axis lines and angular motion;

2) non self-aligning bearing (rigid bearing) - bearing raceway between the axis line impedance angle offset.

(4) according to the number of rolling body, divided into:

1) single row bearings -- with a rolling body bearing;

2) double row bearings -- with two rows of rolling bodies bearing;

3) multi row bearing - with more than two rows of rolling bodies bearing, such as the three column, four row bearings.

(5) according to their components are respectively, divided into:

1) respectively, has respectively bearing bearing components;

2) can not be separately - bearing in the final after supporting bearings, rings are not bearing any free respectively.

(6) according to their structural shapes (such as with or without filling slots, with or without inner, outer ring and ring shape, structure, retaining edge very

To non retaining frame) can also be divided into structural types.

2 according to the rolling bearing size classification according to the outer diameter of bearing size, divided into:

(1) the miniature bearing, nominal diameter for bearing size below 26mm;

(2) small bearings -- nominal diameter size scale for 28-55mm bearing;

(3) small and medium-sized bearings, nominal diameter size scale for 60-115mm bearing;

(4) in large bearing - Nominal outside diameter size scale for 120-190mm bearing

(5) the large bearing - nominal diameter size scale for 200-430mm bearing;

(6) extra large type bearing, nominal diameter size for the bearing more than 440mm.

3 high precision bearings: robot bearings and CNC machine tool YRT turntable bearing

(1) the robot bearing: thin-walled cross roller bearings, cross roller bearings, cylindrical roller in a V shaped groove 90 degrees

The rolling surface through the isolated blocks are arranged vertically, the

To cross roller bearings can bear radial load, axial load and torque load and multi direction load. The inner ring and the outer ring gauge

"Is small, thin form is more close to the limit of small

Type size, and has the advantages of high rigidity, and the precision can reach P5, P4, P2. (2) YRT rotary bearing, by a push

Centripetal force / seat, a thrust / radial shaft washer, a thrust washer, two needle roller and cage assemblies and a set of concentric

Cylindrical roller.

Seat ring and the shaft ring with a screw hole with a uniform installation. This type of bearing with high axial and radial load capacity‍

Turntable bearing load on the effects of using precision

To maintain a good state of bearing and the use of performance, maintenance, repair, in order to prevent accidents, ensuring the reliability of operation, increase production, 

economy. To maintain the best operating conditions of the corresponding mechanical operating standards, regular inspections to maintain in good condition and performance of 

bearing, maintenance, overhaul, in order to prevent accidents, ensuring the reliability of operation, increase production, economy. To maintain the best operating conditions of 

the corresponding mechanical operation standard, check regularly. Examination content includes monitoring running state, supplement or replacement of the lubricant, periodic 

disassembly inspection. As a matter of maintenance in operation, a rotary voice, YRT turntable bearing vibration, temperature, the state of grease and so on. Remove bearing 

overhaul, the first recorded appearance of the bearings, confirm the remaining amount of lubricant, after sampling inspection by the lubricant, cleaning bearings.

On the basis of efficiency for turntable bearing load on the rotation of the ferrule, working condition, the load ring bear is divided into a fixed load, dynamic load and 

rocking out load three.

A. fixed load synthetic radial load by raceway parts undertaken, and delivered to the shaft or housing appropriate parts of the corresponding range wind appearance. The load 

bearing in Sweden called fixed bearing load. Unique local fixed load is radial load and the synthesis of relatively static ring. Assume the fixed load. General can choose loose 

fit.

B. off the dynamic load effect for the synthesis of radial load vector bearing ring raceway of along the circumferential direction of the rotation, are borne by the various 

parts of the various parts of the raceway, and accordingly passed to the shaft casing hole appearance. This is called off load dynamic load, also called cyclic loading. Off the 

unique local dynamic load is relative to the rotating synthetic radial load vector and the ring. Take off the reproduced ring bearing and shaft or housing holes should choose 

clearance or interference fit. Synthesis of radial load vectors to the bearing ring raceway in the ring within a given area relative rocking, undertaken for the raceway certain 

region, and transmitted to the shaft or housing bore the appearance of certain region, or the effect is used for load bearing is the impact load, oscillating load, the the 

loading direction or digital often changes, the load is called rocking load, also called not the direction of load. Taper bearing rocking load, especially in the bear the heavy 

shoulder the burden, inside and outside the circle of which shall be deemed appropriate and use the interference fit. The inner rocking rotation, general inner ring that uses 

off the dynamic load when appropriate‍

Bearing grinding: grinding stainless steel material selection method and technical points

Because of some manufacturers of special requirements,  production cross roller bearings and YRT turntable bearing needs to use the stainless steel 

material, the need to do not with ordinary high carbon chromium bearing steel grinding, the grinding requirements of stainless steel material are introduced.

1Abrasive: white corundum with cutting performance and word sharp good, suitable for grinding martensite and martensitic and ferritic stainless steel; single crystal 

corundum abrasives suitable for austenitic and austenitic and ferritic stainless steel; microcrystalline corundum abrasive is composed of many small crystals, high strength, 

toughness and self sharpening good,

The self sharpening characteristics is the gap along the microcrystalline broken bearing column, so as to obtain micro toughness

And micro edge higher, can reduce the burn, hacking and other phenomena, and can reduce the grinding surface roughness, suitable for grinding various stainless steel; cubic 

boron nitride abrasive high hardness, good thermal stability, high chemical inert, 1300 ℃ ~ 1500 ℃ no oxidation, abrasive blade tip is not easy to blunt, grinding heat is 

small, suitable for grinding various kinds of stainless steel, in order to reduce the adhesion phenomenon, also can use silicon carbide and diamond abrasive wheel.

2 size: grinding stainless steel, general grinding wheel with No. 36, No. 46, No. 60 middle size is appropriate, the coarse grinding, the No. 36, No. 46 grain size, with 60 

grit grinding. In order to be used for coarse grinding and fine grinding,roller bearing  the No. 46 and No. 60 grain size.

3  Bond: grinding stainless steel wheel has high strength, in order to bear a larger impact load. Vitrified heat-resistant, resistant to corrosion, wheel it made can keep 

good cutting performance, moisture resistance, porous, binder for making grinding stainless steel wheel. Grinding tolerance

Concentrated nitric acid stainless steel inner hole, the resin bond grinding wheel manufacturing.‍

In addition, research and development related to high-end precision spindle bearings materials

Bearings are critical infrastructure equipment manufacturing parts, equipment widely used in the field of large-scale wind energy , hydropower units , nuclear power plants , deep drilling rig , offshore drilling platforms , etc., directly determines the performance of major equipment , the level of quality and reliability. From the point of view on the world market , without exception, are bearing industrial powerhouse R & D, manufacturing power . Therefore , bearing manufacturing , especially the development and manufacture of high-end bearings are generally subject to national attention.
In the current domestic market, high value-added precision bearing demand and large compound growth rate of around 20% , although the growth speed, great market potential, but at present the vast majority of our production is small-scale and small wind power bearing and medium bearing bearings bearing the above in large-scale production accounted for less than 3%. technological backwardness of China's bearing industry and is closely related to a serious shortage of technical personnel , technical personnel bearing enterprises nationwide phenomenon prevalent in the age structure of the fault . In addition, research and sealed bearing development related to high-end bearing materials, oil and lubrication, manufacturing, design , bearing manufacturing equipment , testing and other tests a series of technical problems, to solve this problem is not a short series can do . However , in recent years, the country is stepping up efforts to support and encourage the bearing industry , especially the development of high-end products bearing .
Champoux consulting in the " 2014-2017 China bearing tube industry sales forecast demand and investment analysis report " mentioned : the role of high-end products bearing the high-precision machine tools, high-speed rail , instrumentation and other fields is growing , China's also need to break the monopoly of foreign high-end products , the next state will further introduce policies to promote the great development of China's high-end products bearing .

agricultural bearings From the data , the current domestic marine ships

Proposed two sessions related to economic growth targets , infrastructure around the city began to actively start including road , rail, water , ports, airports and other major urban projects . Carry out large-scale projects , so that the entire domestic construction machinery industry to recover, demand for construction machinery mobile crane bearing relatively strong , while increasing market demand for bearing a certain extent .
Bearing rising production plan
From the data , the current domestic marine ships, automobiles , oil pipelines and so on industry production plans to maintain a certain stability. And bearing a slight increase in construction machinery industry production plans. With the recovery of the construction machinery industry will contribute significantly to the demand for bearings , bearing industry will develop further. Most of the conical bearing steel enterprises to maintain good sales in March , sales growth could help stabilize the entire bearing steel market , promote the rapid development of bearing steel companies.
Growth in demand for high-end bearings
The current stable development of China's bearing manufacturing industry , market demand for high-end bearing is growing, such as machine tool bearings , aerospace bearings, high-speed precision bearings, wind power bearings, rolling bearings , high-speed rail bearings, turbocharger bearings , and so on .

precision spindle bearings one of the main components Detailed hoist electric hoist control box

Today, one of the main components Detailed hoist electric hoist control box, look hoist control box structure : control box by a transformer box, contactors, terminal blocks and other components of electric chain hoist control box using machines with high-quality AC contactor , the load and momentary overload are greatly improved, can get better, more suitable for frequent operation of lifting appliances needed ; protection of high quality cold rolled steel sheet stretch forming , electrostatic spray . Different lengths are also available sealed bearing upon request and multi-core cables flashlight door ; After the control box lid opened, detachable from the hinges , user-friendly installation and maintenance ; control box has to take the electrical and mechanical interlock chain , so that the same two groups of contacts can not be simultaneously connected to the circuit ; each control box is equipped with electrical wind power bearing schematics, wiring terminals have clearly consistent with the schematic number , user maintenance, wiring.
     The following is a hoist control box work conditions :
1 ambient air temperature is -20 ℃ ~ +40 ℃;
(2) Relative humidity: lowest average humidity is 90 %, while the average minimum temperature for the month was 25 ℃, and taking into account the temperature changes in the surface of the product Cream ;
3 workplace should have no violent shaking and vibration of the place ;
4 In the absence of explosive medium, the medium does not corrode metal and damage the insulation of gas and dust ( including conductive dust ) ;
5 not more than 2500 meters above sea level ;
6 In the absence of rain and snow ( except rain control box ) .

precision spindle bearings the network development of the market in order to become a trend

 Currently, the network development of the market in order to become a trend, accelerate the transformation and upgrading of traditional economic growth model to maintain high economic growth mode becomes an inevitable choice in this situation, the urgent need mobile crane bearing to open up China's bearing industry and market development in emerging fit development model to meet effective demand of the market.
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