Calendering machine design

The key to the design of the two-roll open calender machine is roller structure, material selection and roller surface processing and technical parameter determination, followed by the configuration of the function. In the roller structure, we have adopted a different height of the large roller diameter in the rubber and plastic products industry, the height = (D-d) / 2, as shown in Figure 7. The purpose is to compensate for the rolling stress caused by the rolling deformation of the roll and improve the rolling part of the rolling force, forced magnetic particles to both sides of the flow, while for rolling may take different roll heating, respectively, designed for steam heating Of a hollow roll and a peripheral bore roll adapted for oil heating and water heating.

Through the production practice, the two kinds of heating methods can meet the process of roller surface temperature fluctuations in the error requirements. In the material selection, we use good wear resistance, rigidity of the alloy chilled cast iron material, roll face hardness HS72 ~ 75. But the alloy chilled cast iron roll is often due to casting defects and additives in the pellets may be on the roller surface corrosion, resulting in a short time after the use of roller surface "ice-like clouds", can not be pressed out of the smooth surface of the magnetic plate, thus It is necessary to carry out special treatment of the roller surface. Special treatment mainly has surface spray wear-resistant materials and hard chrome plating in two ways, we are using the latter.

To enhance the hard chrome and alloy chilled cast iron bonding strength, chrome before the need to first nickel, grinding processing, the thickness of the chrome layer is generally 0.05 ~ 0.08mm. It should be noted that in the production of PVC film coated with a side, the horizontal two-roll calender is best configured as a chrome-plated roller and the other is an alloy chilled cast iron roll. As the alloy chilled cast iron roll surface of the magnetic plate is relatively rough, is conducive to enhance the bonding strength of PVC film and magnetic plate.