How is the injection molding machine cylinder used and maintained?
(1) notes for use of cylinder
When installing and disassembling the cylinder, it shall protect the flange connection plane, the front end and the nozzle connection plane, and no scratches or impact pits shall be allowed.Keep the connection surface clean and free of any foreign matter during installation.Tighten the connecting nut evenly at all points.
After reaching the process temperature, each connecting nut should be retightened once more to avoid parts deformation and material leakage.
Residuals of corrosive polyvinyl chloride, polycarbonate and butyrate materials are not allowed in the production stoppage time cylinder.After stopping the machine, the cylinder must be cleaned and then coated with protective oil.
If the cylinder is to be removed, it shall be removed in hot condition after cleaning the residual material in the cylinder.
A copper brush or abrasive cloth is used to clean the cleaning machine cylinder. Do not shave with a steel knife or hard tool.
classes of containing glass fiber, carbon fiber or calcium carbonate modified, reinforced plastic resin such as plasticizing, injection should be used with wear-resisting, corrosion resistance of the alloy bushing barrel plasticizing, because these inorganic mixture is bigger to the wear and corrosion resistance of the barrel.
It is not allowed to use a heavy hammer to hit the tool cylinder when it is disassembled.
Less weight can be stored on the cylinder.
(2) repair of the cylinder
If the inner surface of the cylinder is not seriously worn or scratched, it can be polished by grinding on the bed with oilstone or sand cloth.
(2) the barrel inner surface wear is serious, should first check the wear depth of the trench, calculate remove the grinding of the trench wall also have hard layer heat treatment, such as there is a hard layer, can be carried out on the barrel inner hole grinding, to get rid of the trench.The roughness Ra of the inner surface after grinding should not be greater than 1.60 degrees Celsius.The tolerance of hole axis is according to GB1184-1980 standard grade 7 precision.Then according to the inner diameter of this machine barrel, the screw is rearranged.If there is no heat treatment hard layer on the inner surface of the machine barrel after grinding, the alloy inner sleeve can be prepared and loaded into the machine barrel.Centrifugal casting method can also be used to cast a layer of hard alloy on the inner wall of the cylinder, and then used after machining and grinding.