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Wide temperature self-lubricating bearing, the solid lubricant material content sufficient release uniform, with good self-lubricating properties and bite resistance, can effectively protect the journal, to achieve lasting purpose. For high temperature, low speed, heavy, dusty, water shower and a shock and vibration environments running, can be widely used in mining machinery, metallurgy, petroleum, chemical, food, textile, paper, printing and dyeing machinery rolling and plain bearings parts.
Production of the aluminum electrolytic bath liquid, suction vacuum ladle and poured into the mixing vessel, through the ratio and slag, the flow into the casting machine casting aluminum, forming a solid called aluminum, the production of aluminum ingots from the stacker stacking. In order to improve production efficiency, before forming ingots with a large number of cooling water for cooling, the cooling of molten aluminum during the great heat released into the cooling water to produce hot water vapor. Casting machine bearings in high temperature and water vapor on the environment, many of them are grease lubricated bearings, grease added a relatively short time because of the high temperature melt overflow removal, maintenance difficulties, equipment surfaces health is also difficulty swabbing. Again steel bearings in the hot, humid environment is very susceptible to corrosion rust, the failure rate is very high, higher cost of equipment maintenance, equipment operation and subject to the following two problems often troubled.
Supply operation is difficult to achieve high temperature continuous operation pulled ingot casting machine, moving ingots, then ingots, turned spindles and other devices are installed in the unit housing, each rotating bearing on the design of the nozzle regularly inject grease facilities, oiling required parking Remove the shell, oil, grease gun pressure on people. And the whole oiling points up to 30 multiple, long-term operation and maintenance can not achieve this kind of complicated oiling operation, had held dilute oiler with spraying in the operation of the bearing sleeve exterior, lubricating oil is difficult to enter the bearing friction between large part of the bearing is friction state.
High ambient temperature, grease lubricated bearings are not suited to the current casting machine with molybdenum disulfide grease is considered to high temperature grease, we know it's base oil are petroleum products, plus a small amount of high temperature molybdenum disulfide additive, its temperature limit is 120 ℃. According to measurement of casting machine bearing operating temperature up to 200 ℃, has far exceeded the grease temperature limit. In such high temperature conditions, the grease base oil thins gradually evaporated and the remaining carbon residue, molybdenum disulfide, dust solidified mixture into a solid block in the rolling bearing retainer, not only lose its lubricating action, also impede the normal operation of rolling bearings and wear out quickly, up to two weeks would have shut down, remove the bearing grease cleaning ones.
A, wear condition:
Aluminum ingot casting equipment bearing running two major problems caused by abnormal wear of the bearing is more serious. Taking a firm pull aluminum ingots institutions, for example, the average life of two months bearings, wear serious virtues 5mm inner ring worn, resulting device can not continue to run.
Wear is uneven. The reason is the original design can not be achieved to the oil, had a running thin oil bearing outside shower burn, burn a small amount of cream bearings, the wear on the smaller can also be seen from the table, more than 50% of the shaft and the sleeve is not be lubricated, but in a state of dry friction produces a stronger adhesive wear. This increases the shaft and sleeve wear out quickly amusement gap, then dust it easier to enter, resulting in a vicious cycle.
B, oil-free self-lubricating bearings selection:
Machinery and equipment in order to solve the high-temperature, low-speed, heavy, dusty, water shower and a shock and vibration lubrication problems, use oil-free self-lubricating bearings.
1, the bearing structure is a self-lubricating bearings in the bearing friction surface of the metal substrate arranged orderly development of appropriate size hole, and embedded molybdenum disulfide, graphite, etc. made of composite self-lubricating block set in a metal sleeve, made of composite bearing, solid lubricant friction area of 25-65%. Solid self-lubricating block in the high temperature of 280 ℃ work. But because of its low mechanical strength, bearing capacity is weak, easy to produce deformation, it can set the slot hole in the metal suppress this drawback, since the metal part forming a bearing effect, self-lubricating block for lubrication. This self-lubricating bearing lubrication mechanism of the shaft and the sleeve during the sliding friction, self-lubricating material transferred to the shaft part of the molecule on a metal surface, fill tiny not flat, and the formation of a layer of a solid lubricating film is more stable , resulting in a solid lubricating film between the right grind, shaft and sleeve to prevent adhesive wear. This combination of rational combination of copper alloy and non-metallic materials by grinding their complementary advantages, especially for oil-free, high-temperature, high-load, low-speed, anti-fouling, corrosion, strong radiation environment movement amplitude, as well as infiltration in water or other solutions is impossible to add grease used under special working conditions.
2, self-lubricating block occupies an area of more than self-lubricating block representing the number and surface area of the running speed, pressure intensity, low speed; bearing strength, metal occupied area should be larger. Such as grasping ingot Trolley OK axle Cheng Zirun slider occupied area is about 25%, pulling ingot institutions shaft bearing lubrication to the full, bearing strength of small, self-lubricating block occupied an area of about 65%.
3, the technical requirements of the lining material made of copper alloy bushings to be used, the liner should have high hardness, are generally required to heat treatment, the hardness of not less than HRC45.
4, self-lubricating block geometry and setting requirements. Self-lubricating block is cylindrical and rectangular shape with two kinds of self-lubrication can be used according to the size of the area occupied by cylindrical, and vice versa can be rectangular. Whatever the shape must be mounted securely to prevent shedding in operation.
5, bushing and shaft with self-lubricating block gap value of linear expansion coefficient of about 10 times that of steel. To adapt to temperature changes the bearing shaft and bushing clearance with the original metal four grades (D4/dc4) 0.032 ~ 0.15mm, increase of 0.45 ~ 0.5mm. Self-lubricating block projecting side friction bushing metal 0.2 ~ 0.4mm. This will work in the initial running-in period the bearing adequately lubricated, reduce power consumption of power draw.
6, oil-free self-lubricating bearings advantages:
a. less oil lubrication oil lubrication, apply to the oil or fuel is difficult to place, you can use without maintenance or less maintenance.
b. wear resistance, low coefficient of friction, long service life.
c. has the right amount of plasticity, can stress distribution in a wide contact surface, improve the bearing capacity.
d. static and dynamic friction coefficient, can eliminate the low speed crawling, thus ensuring the accuracy of mechanical work.
e. enables mechanical reduce vibration and reduce noise, prevent pollution and improve working conditions.
f. during operation can form a lubricating film, play a role in protecting the shaft, no bite shaft phenomenon.
g. for low hardness grinding shaft, the shaft can be used without the conditioning, thereby reducing the associated machining difficult.
h. thin-walled structure, light weight, can reduce the machine size.
i. bushings made of brass, can be used in corrosive media.
Business practices through an aluminum casting machine bearings replaced oil-free self-lubricating bearings, has been used continuously for 15 months, and is still running, shaft, bushing clearance is generally not more than 1mm, can be expected to re-use 12 months, significantly over the original life (2 months). Oil-free self-lubricating bearings not only in ingot casting machines to get better use, but can be adapted to oil-free, high-temperature, high-load, low-speed, anti-fouling, corrosion, strong radiation environment movement amplitude, as well as in the water infiltration or other solution is impossible to add a special grease equipment under operating conditions, these bearings have a wider promotional value.
Currently various bearings used in machinery industry, most still ball, needle and the like, but a small part has adopted the self-lubricating bearings, I believe that in the near future from the bearings lubricated bearings will become dominant.
Here are some self-lubricating bearings application features and advantages:
1, no less oil lubrication oil lubrication, apply to the oil or fuel is difficult to place, you can use without maintenance or less maintenance.
2, good wear resistance, low coefficient of friction, long service life.
3, there is the right amount of plasticity, can stress distribution in a wide contact surface, improve the bearing capacity.
4, static and dynamic friction coefficient, can eliminate the low speed crawling, thus ensuring the accuracy of mechanical work.
5, can reduce mechanical vibration, reduce noise, prevent pollution and improve working conditions.
6, can be formed during operation, transfer film, played the role of protecting the shaft, no bite shaft phenomenon.
7, for grinding shaft hardness is low, without quenching axis can be used, thereby reducing the associated machining difficult.
8, thin-walled structure, light weight, can reduce the machine size.
9, a variety of metal plated steel back can be used in corrosive media; has been widely used in various mechanical sliding parts, such as: printing, textile machine, tobacco machinery, micro-motors, automobiles, motorcycles and forestry machinery and so on.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 30332 NTN | 160 | 340 | 68 |
| 30332U NTN | 160 | 340 | 68 |