The composition of the calender machine
The calender is mainly composed of roller, roller bearing, roller
bearing lubrication system, distance device, shaft crossing device,
preload device, thermostat device, spreader device, automatic thickness
measurement device.Roller
The calender roller is similar to the roller of the rubber mill, but requires more precision. Since the calender is used for the production of semi-finished products, the surface roughness of the roll is generally not higher than Ra1.6, and the roll is required to have sufficient rigidity , Thereby reducing the bending deformation under the action of transverse pressure, but also requires the roller in the heating or cooling, the roller temperature as much as possible to achieve the same, requiring the hollow roller cavity along the entire working length of the boring to ensure that the roller The thickness of the same, to avoid bending and surface temperature uneven, resulting in uneven thickness of the rolled products. Rolling machine roller material using chilled cast iron or cast steel, roller structure in two ways, one is the hollow roller, one is the drilling roller.Roller bearings
⑴ sliding bearing: calender machine sliding bearing structure is generally the same with the open mill, but it has the following characteristics. ① smaller bearing body, the use of thin oil forced lubrication and cooling, and with a filter cooling equipment. ② bushing by the fan-shaped pad, due to the location of different bearings, bearing angle is also different. ③ The same roller with different roller bearings can not be interchangeable. ④ high precision requirements, bearing clearance need to be reduced to a minimum, to reduce the semi-finished product error.
⑵ Rolling bearings: Rolling bearings are widely used in high precision new calendering machines. The advantage is that the rollers of the rollers are tapered, which can improve the strength of the journal, the wear of the roll neck and reduce the rotation of the rollers The resulting eccentricity problem, the friction loss is small, the durability is good, the maintenance cost is little. But the manufacturing technology and installation of high technical requirements, high product costs.Roller bearing lubrication system.
Roller bearings roller bearings are characterized by: heavy load, low speed, high temperature. When using a sliding bearing, the bearing lubrication is in the boundary friction lubrication state. Its friction work to be converted into heat, to the timely export of heat in order to maintain normal lubrication and operation. For this reason, it is possible to increase the supply amount of the lubricating oil, increase the heat dissipation capacity of the bearing body, and improve the heat resistance of the lubricating oil.
Distance device
The distance adjusting device is used to adjust the roll distance of the calender roll. Commonly used distance device can be divided into two kinds of monolithic and separate.
Shaft cross device
The effect of the shaft crossing is to apply an external force at both ends of the roller so that the two parallel rolls produce axial crossings to compensate for the uneven thickness of the film due to roller deflection.
Preload device
The preload device is also known as a zero gap device or pullback device. Regardless of the rolling bearing or sliding bearing, there is a gap between the roller journal and the bushing. Because the roll may produce thermal expansion. When the calender load work, the roller from the filling material, roll neck and sleeve gap between the horizontal pressure in the horizontal pressure gradually reduced to zero, and thus no effect on the film thickness. However, when the amount of glue in the roll is changed, the lateral pressure P1, P2, and P3 acting on the roller changes, which causes the film thickness to change first.
The calender roller is similar to the roller of the rubber mill, but requires more precision. Since the calender is used for the production of semi-finished products, the surface roughness of the roll is generally not higher than Ra1.6, and the roll is required to have sufficient rigidity , Thereby reducing the bending deformation under the action of transverse pressure, but also requires the roller in the heating or cooling, the roller temperature as much as possible to achieve the same, requiring the hollow roller cavity along the entire working length of the boring to ensure that the roller The thickness of the same, to avoid bending and surface temperature uneven, resulting in uneven thickness of the rolled products. Rolling machine roller material using chilled cast iron or cast steel, roller structure in two ways, one is the hollow roller, one is the drilling roller.Roller bearings
⑴ sliding bearing: calender machine sliding bearing structure is generally the same with the open mill, but it has the following characteristics. ① smaller bearing body, the use of thin oil forced lubrication and cooling, and with a filter cooling equipment. ② bushing by the fan-shaped pad, due to the location of different bearings, bearing angle is also different. ③ The same roller with different roller bearings can not be interchangeable. ④ high precision requirements, bearing clearance need to be reduced to a minimum, to reduce the semi-finished product error.
⑵ Rolling bearings: Rolling bearings are widely used in high precision new calendering machines. The advantage is that the rollers of the rollers are tapered, which can improve the strength of the journal, the wear of the roll neck and reduce the rotation of the rollers The resulting eccentricity problem, the friction loss is small, the durability is good, the maintenance cost is little. But the manufacturing technology and installation of high technical requirements, high product costs.Roller bearing lubrication system.
Roller bearings roller bearings are characterized by: heavy load, low speed, high temperature. When using a sliding bearing, the bearing lubrication is in the boundary friction lubrication state. Its friction work to be converted into heat, to the timely export of heat in order to maintain normal lubrication and operation. For this reason, it is possible to increase the supply amount of the lubricating oil, increase the heat dissipation capacity of the bearing body, and improve the heat resistance of the lubricating oil.
Distance device
The distance adjusting device is used to adjust the roll distance of the calender roll. Commonly used distance device can be divided into two kinds of monolithic and separate.
Shaft cross device
The effect of the shaft crossing is to apply an external force at both ends of the roller so that the two parallel rolls produce axial crossings to compensate for the uneven thickness of the film due to roller deflection.
Preload device
The preload device is also known as a zero gap device or pullback device. Regardless of the rolling bearing or sliding bearing, there is a gap between the roller journal and the bushing. Because the roll may produce thermal expansion. When the calender load work, the roller from the filling material, roll neck and sleeve gap between the horizontal pressure in the horizontal pressure gradually reduced to zero, and thus no effect on the film thickness. However, when the amount of glue in the roll is changed, the lateral pressure P1, P2, and P3 acting on the roller changes, which causes the film thickness to change first.
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