Application of Self-lubricating Bearing on Aluminum Ingot Casting Machine

The self-smooth bearing has a wide application temperature, solid content sufficient for smooth material, uniform release, excellent self-smoothing function and bite-combination, can effectively maintain the journal, and achieve long-lasting application intention. Suitable for operation in high temperature, low speed, heavy load, large dust, water shower, and shock oscillating environment. It can be widely used in tumbling of mechanical equipments such as mining machinery, metallurgy, petroleum, chemical industry, food, textile, papermaking, printing and dyeing. And sliding bearing parts.
The aluminum ingot produced from the aluminum electrolytic cell is poured into the mixing furnace after being sucked and sucked by a vacuum. After passing through the proportioning and deslagging, the aluminum ingot is poured into an aluminum ingot casting machine to be cast and molded. The formed solid is called an aluminum ingot. Aluminum ingots are stacked by a stacker. In order to improve the output power, it is necessary to use a lot of cooling water for cooling before the aluminum ingot is formed. During the cooling process, the infinite thermal energy of the aluminum liquid is released into the cooling water, and hot steam occurs. Casting machine bearings are in a high-temperature Wenshui steam environment, many of the bearings are grease smooth, increased smooth grease will be melted overflow due to high temperature in a short time to remove, maintenance maintenance is difficult, the device is also easy to clean appearance. In addition, the steel layout bearing is very easy to corrode and rust in a hot and humid environment, the failure rate is very high, the equipment repair cost is high, and the equipment operation is often puzzled by the following two problems.
It is difficult to complete the high-temperature operation for the oil supply operation. Pulling ingots of the casting machine, DU boundary lubricating shaft bushings, ingots, and ingots are all installed in the unit housing. Each time the oil is pumped, the housing is removed, and the oil gun is used to press the oil. Smooth grease. And as many as 30 oil injection points, the long-time operation and maintenance can not complete this cumbersome oil injection operation, had to carry the thin oil cans poured in the operation of the bearing sleeve outside, the smooth oil is difficult to enter the conflict between the bearing, Most bearings are in conflict.
High ambient temperature, smooth grease is not accustomed to the current molybdenum disulfide smooth grease used in the casting machine tumbling bearings are high-temperature grease, we know that its base oil is an oil commodity, plus a few high temperature molybdenum disulfide enhancer, its resistance The temperature limit is also 1200C. It is measured that the working temperature of the bearing of the casting machine can reach 2000C, which is far more than the smooth grease will become thin and will be gradually transpired. The remaining carbon slag, molybdenum disulfide, and dust will form a solid block to condense on the holding frame of the tumble bearing. Lose its smooth effect, but also prevent the normal operation of the tumbling bearing and wear quickly, up to 2 weeks have to stop, remove the bearing cleaning and replacement of oil.

First, the wear
The abnormal wear caused by the two major problems in the bearing operation of aluminum ingot casting equipment is severe. Taking a company's pulling ingots as an example, the bearing has a uniform service life of 2 months. When the wear is severe, the 5mm inner ring is worn out, causing the equipment to not continue operation. The reason is that the original plan to oil method can not be completed, had to be outside the bearing in the operation of burning thin oil, a few can be burned into the bearing, the wear is smaller, and beyond 50% of the shaft and sleeve did not get smooth, in the soil conflict Strong adhesive wear occurs under the circumstances. This wear quickly increases the clearance between the shaft and the sleeve, so that the dust can enter more easily and constitute a vicious circle.
Second, the choice of oil-free self-lubricating bearings
In order to deal with the smooth question of high temperature, low speed, heavy load, large dust, water showering and impact oscillation in the mechanical equipment, the oil-free self-smooth bearing is selected.
1. The layout of the bearing
The self-smooth bearing is developed on the metal conflict surface of the bearing base with an ordered and sized hole, and is embedded with molybdenum disulfide, graphite, etc. The composite self-light slider is embedded on the metal sleeve to make the composite slider. Normal operation at 2800C. However, due to its low mechanical strength, the bearing capacity is weak, and it is easily deformed. When it is embedded in a metal hole, this defect can be suppressed, and the metal part can bear the bearing effect, and the smooth effect can be obtained from the light slider. The smooth mechanism of this self-smooth bearing is that in the process of the oil-dynamic conflict between the shaft and the sleeve, a part of the smooth data molecule is transferred to the metal surface of the shaft, and the small, non-planar surface is filled. The stainless steel is rolled into a bush and constitutes a layer. The more stable solid smooth film, the structure of the body between the smooth wear, to avoid the shaft and the sleeve of the adhesive wear. This rational link sums up the respective complementary strengths of the copper alloy and non-metallic wear reduction data, and is particularly suitable for oil-free, high-temperature, high-load, low-velocity, anti-fouling, corrosion-resistant, and strong-radiation environments, as well as It is applied under special working conditions where water or other solutions moisten and the base does not add smooth grease.
2. Area
The ratio of area occupied by the optical slider to the area occupied by the optical slider is related to the working speed and bearing strength, and the working speed is low. The bearing pressure is high, and the area occupied by the metal should be larger. For example, the area occupied by the light slider of the trolley-car walking wheel bearing is about 25%, and the smoothness of the pull-ingot-sliding bearing should be sufficient, and the bearing strength is not large, and the area occupied by the light slider is about 65%.
3. Skill requirements for bushing data
Bushings should be made of alloyed copper. The bushings must have a high hardness and must be heat-treated. Their hardness is not lower than HRC45.
4. How many shapes and inlay requirements from light sliders
Since the shape of the optical slider is cylindrical and rectangular, self-smoothing can be based on the area occupied by the column, and vice versa. Regardless of the shape, it is necessary to sturd in order to prevent falling in the job.
5. Bushing and shaft cooperation gap value
The cooperative gap between the bush and the shaft is 10 times the linear expansion coefficient of the light slider. For the customary bearing temperature change, the gap between the shaft and the bushing is originally from 0.032 to 0.15mm (D4/dc4), which is increased by 0.45~0.5mm. Since the light slider is on the side of the conflict, the outstanding bushing metal is 0.2~0.4mm. This will be smooth and smooth during the initial running-in period of the bearing operation, reducing the power consumption of power driving.
6. The advantages of oil-free self-lubricating bearings
a. No oil smooth or less oily, suitable for places that can not be refueled or difficult to refuel, can be used in the maintenance or conservation.
b. The wear resistance is good, the conflict coefficient is small, and the service life is long.
c. With proper elasto-plasticity, the stress can be spread over a wide touch surface to improve bearing bearing capacity.
d. In the vicinity of the static motion conflict coefficient, the enthalpy at low speeds can be eliminated, and oilless bearings can be slid to ensure the machine's working accuracy.
e. It can reduce the vibration of machinery, reduce noise, avoid pollution, and improve working conditions.
f. Conveyor film can be constructed during the process of the job to maintain the effect of grinding on the shaft, without bite-shaft appearance.
g. Regarding the hardness requirement of the grinding shaft, the unscheduled shaft can be used, and then the processing difficulty of the relevant parts is reduced.
h. Thin-walled layout, light weight, can reduce the mechanical volume.
i. The bushing material is brass and can be used in corrosive media.

Hunan Jintai Hardware and Machinery Co.,Ltd. is a professional manufacturer on various kind of bearings over 15 years China factory.
We are making all kinds of slide bearings including DU PTFE composit bushing, DX POM composite bushing,bimetal bushing,wrapped bronze bushing, cast sliding bushings and wear plate bearing pad, sintered bronze bushing and sintering parts, ball transfer bearings, etc.
The shapes of bearings can be in sleeve, flanged, spherical, plate, washer, pad, ring, square etc.
Base materials in carbon steel, harden steel, iron, stainless steel, bronze, brass, copper, bronze-steel alloy.Lubricant materials in PTFE, teflon, POM, nylon, plastic, oil, graphite, grease, MoS2, etc.
Export to America,Canada,Brazil,Peru,Argentina,Chile,Paraguay,Europe,Finland,France,Germany,Italy,Spain,Sweden,
Britain,Estonia,Ukraine,Turkey,Austrial,Russia,Korea,Malaysia,Singapore,Thailand,Egypt,Kenya,Somali,
Congo,Zimbabwe,South Africa,etc.