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The use of ceramic ball bearings and analysis of shopping malls
Source: Bearing network time: 2013-04-26
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One. The pre-rolling rolling bearing consists of a ferrule; a rolling body and an adherent. Because the ferrule and the rolling body touch point are subjected to external load and rotation effects; thus the repeated contact pressure and deformation occur; because of the steel bearing itself, the functional features; bearing The primary method of failure is fatigue; the fatigue life is short; the scale of use is greatly constrained. The ceramic material (Si3N4) has low density; medium elastic modulus; thermal expansion coefficient.诺诺诺诺ç°ç°æ¼ æ¼ æ±•è›é¾†å®“ 汕蛑岢 汕蛑岢 汕蛑岢 上 上 上 上 上 上 上 上 哟テ 倜 倜 倜 倜 倜 倜 倜 倜 倜 倜 倜 倜 倜 倜 倜 æŒ æŒ æŒ æŒ Refers to 8. å’¦å€©æ³¢é»„æ€ (4) æ€ 5. é¥ 5. ç¼ 10. Jiao è¾— 6. (6) ã›æ€ (14) benzoquinone file 当å‰. Currently; silicon nitride ceramic ball and ceramic ball bearings have begun to enter the mass production period; In the field of high-speed fine spindle bearings for machine tools and high temperature and corrosion resistant bearings, the scope of application is broad.
two. Silicon nitride ceramic data function
1. Low density because of the low density of ceramic tumbler data; centrifugal load. Commissioner slightly 诟咦傧 ã·é³Ž ã·é³Ž ã·é³Ž 攘 攘 攘 攘 . ..
2. The elastic modulus of the medium elastic modulus ceramic tumbling body is higher than that of the steel tumbling body; then the dynamic stiffness of the bearing advances; however, if the elastic modulus is too large, the bearing capacity of the bearing can be reduced due to the stress gathering.
3. The coefficient of thermal expansion is small and the coefficient of thermal expansion is small to help reduce the sensitivity to temperature changes; then to avoid jamming. For hybrid roller bearings; the applicable operating speed is wider.
4. High compressive strength High compressive strength is the need for high-touch stress in rolling bearings (for ceramic materials; its strength is usually determined by three- or four-point bending experiments).
5. The combination of high hardness and high resistance can achieve better surface roughness; and can avoid external hard particles and impact damage.
6. Outstanding anti-rolling touch fatigue feature This feature is critical to the needs of the bearing roll.
7. If the rollover failure method fails in the operation; it should be fatigue and fall off; the effective method has signs before the card is stuck; it is a practical method that constitutes the least damage.
In some applications with higher application conditions, ceramic materials also have some special functions.
8. High temperature resistance and stability can maintain its mechanical function in a high temperature environment up to 800 °C.
9. Corrosion resistance in oxidizing and corrosive environments; especially in the touch zone where repeated tumbling and extrusion of the outer oil film should have anti-oxidation and corrosion stability.
Although silicon nitride data is not the hardest in industrial ceramics; resistance is not the highest; but in the use of high-performance bearing applications; silicon nitride is considered to have the best mechanical physical induction characteristics. Inductive roll-on touch shedding experiment Both the bearing and the bearing experiments have proved that the fine and homogeneous silicon nitride data has outstanding anti-rolling touch fatigue characteristics. The industrial silicon nitride ceramic materials and bearing steel functions are shown in Table 1.
Silicon nitride bearing steel density (Kg/m3) 3250 7800
Young's modulus (GPa) 310 210
Compressive strength (MPa) >3500
Cracking modulus (MPa) 700-1000
Vickers hardness (GPa) 14-18 8
Resistance (MPa0?m1/2) 5-8 16-20
Thermal expansion coefficient (×10-2/°K) 3 12
Thermal conductivity (W/mK) 20 30
Specific heat (J/KgK) 800 450
Use the upper limit temperature (°K) 1050 400-600
High thermal shock resistance tumbling touch fatigue failure method shedding off table 1. The functions of industrial ceramics and bearing steels are comparable. Analysis and prospect of ceramic ball bearing shopping malls at home and abroad
1. Domestic mall
1.1 Ceramic ball bearings for machine tools Ceramic ball bearings for machine tools are mainly used on various machine tool spindles and ball screws.
Bearings for machine tools refer to general machine tool spindles, feed systems, transmission system bearings; various high-speed high-power electric spindle bearings, grinding head bearings and various CNC machine tools, machining intermediate and machining automatic lines and other required bearings. High; its accuracy is P2, P4, P5. This kind of bearing has high skill content; high added value; stable function; long service life; difficult processing. Conventional steel bearings can not be completely satisfied with the high speed and high precision of machine tools. Ceramic ball bearings can compensate for this shortcoming.
1.1.1 CNC ball bearing CNC machine tools for CNC machine tools include CNC lathes, machining intermediates, CNC grinding machines, electric machining machines, CNC forging machines, etc.; angular touch ceramic ball bearings for such machine tools are usually used for dm0鹡≥80×104 High-precision, high-speed spindle. The output value of the national CNC machine tools in the late "Tenth Five-Year Plan" will reach 30,000 to 50,000 units; 10,000 CNC lathes, 3,000 machining centers, 1500 CNC grinding machines, 10,000 electric machining machines, and CNC 600 sets of forging machine tools and 100 sets of CNC heavy-duty machine tools; 4 sets of fine bearings and ceramic ball bearings are evenly distributed for each CNC machine tool spindle; the annual demand for fine bearings and ceramic ball bearings is 140,000 sets. In the meantime; ceramic ball bearings need The amount is 40,000 sets.
1.1.2 Grinding bed electric spindle with ceramic ball bearing grinding machine The electric spindle is mainly used for high-speed internal and external surface grinding machines; its precision and speed need to be higher. "Five-fifth" late; national high-frequency electric spindle with fine bearings and ceramic ball bearing years The required amount will reach 350,000 sets; in the meantime; ceramic ball bearings need to be 50%; then the annual demand for ceramic ball bearings is 175,000 sets.
1.1.3 Other ceramic processing machine tool spindle ceramic ball bearings are estimated; in 2005, the annual output value of metal processing machine tools is 20 to 220,000 units; the total bearing demand is 1650 to 17.75 million sets; deducting CNC machine tools and internal and external surface grinding machines; The other metal processing machine tools are about 180,000 sets; one set of fine bearings and ceramic ball bearings are evenly distributed for each metal processing machine; the annual requirements for fine bearings and ceramic ball bearings are 180,000 sets; in the meantime; ceramic ball bearings need The amount is 50,000 sets.
1.1.4 machine ball ball screw ceramic ball bearing ball screw is used to transmit linear motion; with high precision, high axial rigidity, low torque and long life; it is widely used in fine mechanical equipment; it is CNC The machine tool carefully measures the attachments that are not short.
The accuracy and rigidity of the ceramic ball bearing for ball screw are important factors to ensure the high precision and high axial rigidity of the ball screw. The bearing layout of the ball screw at home and abroad is usually a high-precision angular touch ball bearing; Strict; need to reach the ISO international standard P4 level; for the axial bearing capacity of the forward bearing; usually choose 60 ° large contact angle bearing. To reach the great axial rigidity; the most common is to choose the group device method.
With the expansion of the production scale of CNC machine tools and the increase of the social quantity of CNC machine tools; the social needs of ball screws have also increased. According to the machine tool occupation, the guess is made; the demand for ball screw in China is 120,000 in 1995; It is 160,000 pairs; it is estimated that it will be 200,000 pairs in 2005; each pair of ball screws will be equipped with 4 sets of fine bearings evenly; in 2005, the demand for fine bearings for domestic ball screws will be 800,000 sets; Ceramic ball bearings; the annual demand for ceramic ball bearings is 160,000 sets.
Therefore; CNC machine tool spindle, grinding machine electric spindle, other metal processing machine tool spindle and ball screw need a total of 1.47 million sets of fine bearings and ceramic ball bearings; in the meantime; ceramic ball bearings 425,000 sets.
The machine tool occupation is equipped with the basis of industry. 呛饬 酆暇 酆暇 酆暇 ä¾æ® ä¾æ® ä¾æ® ä¾æ® ä¾æ® ä¾æ® ä¾æ® ä¾æ® ä¾æ® ä¾æ® ä¾æ® ä¾æ® ä¾æ® ä¾æ® ä¾æ® ä¾æ® ä¾æ® ä¾æ® ä¾æ® ä¾æ® ä¾æ® ä¾æ® ä¾æ® ä¾æ® ä¾æ® ä¾æ® ä¾æ® ä¾æ® ä¾æ® ä¾æ® ä¾æ® ä¾æ® ä¾æ® ä¾æ® ä¾æ® ä¾æ® ä¾æ® ä¾æ® ä¾æ®Wantai; in the meantime, the number of CNC machine tools will increase from 20,000 in 2000 to 3-5 million (according to the actual situation of production in the past two years; the production and sale of CNC machine tools will break the professional plan); accounting for 15% of the total output value The market share of domestic machine tools reached 60-65%, and the total industrial output value increased from 20 billion yuan in 2000 to 230-25 billion yuan in 2005. After accounting analysis, the metal processing machine tool needs a total of 750 bearings. 8.25 million sets; in the meantime, the number of bearings for CNC machine tools is about 1.5 million sets. In 2005, the number of bearings for repairing metal machine tools was 900-9.5 million sets; in the meantime, the number of bearings for CNC machine tools was about 1.8 million sets. Bearings and ceramic ball bearings require a total of 1650 to 17.75 million sets; during this period, CNC machine tools require about 3.3 million sets. Therefore, the domestic machine tool professional ceramic ball bearing shopping mall has a broad prospect.
1.2. Ceramic ball bearings for chemical machinery Ceramic ball bearings for chemical machinery are mainly used for supporting bearings of various industrial pumps; including oil field oil pump, electric submersible pump, water injection pump, booster pump, centrifugal oil pump, centrifugal water pump, corrosion resistant pump, reciprocating pump, Vortex pump, screw pump, crude oil refining pump, deep processing pump, chemical process pump, wear pump and hydraulic pump; large demand; it is estimated that the output value of various pumps will reach 180,000 in 2005; 2 sets of fine bearings and ceramic ball bearings are counted; by 2005, the bearing requirement is 360,000 sets; in the meantime; ceramic ball bearings are 90,000 sets.
In summary, in 2005, the domestic machine tool and chemical industry required a total of 1.81 million sets of fine bearings and ceramic bearings; in the meantime; ceramic ball bearings 51,500 sets.
At present; domestic Luoyang Axis Technology Co., Ltd. ceramic ball and ceramic ball bearing skills ranks at the domestic leading level; ceramic ball accuracy reaches G3 ~ G5 level; ceramic ball bearings complete mass production.
2. The use of ceramic ball bearings in international shopping malls has gradually expanded; the demand has gradually increased; there is a huge potential for development. Currently, the skills of American and Japanese ceramic ball bearings are at the international leading level.
Because of the advantages of silicon nitride ceramic materials; silicon nitride ceramic ball bearings can work in special environments such as high temperature, high speed, high pressure, cryogenic, vacuum, strong corrosion, diamagnetic, no smooth, easy to wear; and steel bearings can not Satisfactory needs. Silicon nitride ceramic balls are now widely used in aerospace engines, various high-precision, high-speed machine tools; automotive, racing, subway, electrical, petrochemical machinery, metallurgical machinery, etc. 1984; Japan Koyo Seiko (KOYO) For the first time in the world, ceramic balls and ceramic ball bearings have been successfully sold as masses. For example, the 6205 ceramic ball bearing is sold at the Hong Kong shopping mall for $110. The US NORTON company successfully applied the ceramic ball bearing to the shuttle's hydraulic pump; Light weight; the speed can be advanced by 0.5 to 1 times; and with or without smooth oil, Japanese ceramic ball bearings are widely used in corrosion-resistant occupations, aerospace engines, machine tools, subways, etc. Sweden SKF to NASA The supply of desalinated ceramic bearings has a temperature of up to 800 ° C; the service life is 4 to 6 times higher than that of steel bearings, SKF is in Shanghai, China. Established an office; operated the company's silicon nitride ceramic bearings; ceramic bearings cost about $120 / set, Japan's NSK company has 28 standard three-level additional angular touch ceramic ball bearings; that is, usually ceramic ball bearings, high speed Ceramic ball bearings, high-speed high-load ceramic ball bearings; such as: ROBUST low-heat high-speed bearings, anti-corrosion bearings, YS-type vacuum bearings, clean environment bearings, SJ-type high-temperature bearings, insulated bearings and train communication traction motors and ceramic tumbling Body, machine tool spindle bearings, etc.; and continuous innovation in smooth skills; in product skills, product quality assurance and product sales; has formed a complete system. According to incomplete statistics; in 1996, the international ceramic bearing sales have exceeded 400 million US dollars.
China's ceramic bearing research started nearly 30 years later than industrial developed countries; however, the research, application and experimental steps of China's ceramic ball bearings are advancing faster. The national machine tool industry is vigorously carried out; the accuracy of forward machine tool products is satisfied; other special application areas are satisfied; ceramic bearings It will play a key role in the resolution; and the selection of new nanocomposite ceramic materials is the trend of precision and function of the advancement of ceramic bearing products.
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Sectional Door Accessories: motor 220V-380V, control box, spring break device, cable break device , aluminum alloy rope pulley, enhanced shaft bracket, air bag system, duplex enhanced guide wheel bracket.
Detail introduction for above main accessories
1.Motor and controller:
The garage door operator is designed for residential overhead sectional and tilt doors.
The operator memorizes the limit positions and unique braking system that slows the unit down at the end of its travel.
Rolling code remote control with max. 20 pcs hand transmitters.
The operator is equipped with a manual release lever which allows manual operation of the door in case of power failure.
The controller has a security LOCK function which prevents operation of the door from transmitter.
2.spring break device:
Sectional doors are hinged and they bend in the tracks as the door opens and closes. Many of these doors are counterbalanced with extension springs, also designated "stretch springs," and they have seven characteristics. The length is the measurement of all the coils pressed together. This, along with the inside diameter of the coils and wire size - the thickness of the wire from which the springs are made - determine the stretch, the distance the spring is extended - normally half the door height, and pull, the force the spring pulls when stretched its normal length. The type of ends determine how the ends of the spring are mounted. The initial tension is the percentage of pull needed to separate the coils. This is determined by the pitch with which the springs are wound. On sectional garage door springs this is normally 15 percent. For example a 100 pound pull spring requires 15 pounds of weight to separate the coils; when a door is open the two springs will support 15 pounds of door weight without any stretch.
Most extension springs are made of oil tempered wire. These are normally coated or painted. Some springs are made of galvanized wire.
3.able break device:
cable break device ,door hardware
adjustable bottom bracket .
the raw material hot plate
zinc plated
safety device
adjustable bottom bracket
the raw material hot plate
zinc plating
spring safety device ,2" and 3" safety device
once the cable is broken ,this devoice can keep the hurt away from the door falling
4.aluminum alloy rope pulley
Equipment: CNC stamping/punching machine, CNC bending machine, CNC cutting
machine, 5~250 tons punching machines, welding machine, polish machines...
Processed material: stainless steel: copper, carbon steel
Surface treatment: Hot galvanized, polishing
Making process:Stamping, deep drawing,bending, punching, laser cutting,threading,
welding, tapping, riveting, grinding
5.air bag system
It is a safety device. When the door is down to hit something, it will up automatically.
Operation pressure:<3mbar
Battery:CR2032*2
Battery lifetime>1 year
Emission frequency: 315MHZ
Emission power:<10mW
Receiver power source:12V
6.duplex enhanced guide wheel bracket
Determining the right type of sectional door roller for your garage door tracks can be a little confusing, especially when you do not know what you need to look for in a garage door roller. To simplify things, there are two primary things you need to be aware of. First are the actual dimensions of the roller, and second is purpose that you will be using the door for. You can read below about measuring your roller and choosing the right quality of material for your door.
Other Door Accessories,Electronic Door Accessories,Automatic Door Accessories,High Speed Door Radar Detector
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