Maintenance of extruder barrel screw?

Update: 2021/03/01

The barrel and screw of the extruder use barrel cleaner […]

The barrel and screw of the extruder use barrel cleaner. If the injection products are replaced frequently or the residual material in the barrel is different from the plasticization temperature range of the refill, in order to save raw materials and improve work efficiency, use barrel cleaning The agent is more economical. The cleaning agent is a kind of rubber-like substance. It does not melt at high temperature in the barrel. It is softened in the screw groove. When it moves forward in the screw groove, it can take away the residual material and make it inside the barrel. Get cleaned up.
The extruder barrel screw accurately weighs the required wear-resistant and corrosion-resistant alloy, and then is heated to melt. The barrel body heated to the specified temperature is taken out of the heating furnace and quickly placed on the centrifugal casting machine to rotate at high speed. The melted wear-resistant and corrosion-resistant alloy is quickly poured into the inner cavity of the high-speed rotating machine barrel, and the wear-resistant and corrosion-resistant alloy and the hole wall of the machine body are fused and condensed uniformly by centrifugal force. Cool the wear-resistant and corrosion-resistant lining of the barrel that has been bimetal cast, and then make the inner hole of the mill barrel.
In the worn part of the extruder barrel screw, the bushing can be replaced. However, the extruder barrel usually replaces the entire bushing, so the maintenance cost is more expensive, which is not cost effective. Once the screw is worn at a certain point, the melt will return to the thread, resulting in further acceleration of the wear of the screw and barrel. Severe wear will cause a lot of resin to be wasted and reduce productivity. However, through regular PM inspections, serious wear and tear can be prevented. The maintenance strategy is to keep the screw/barrel clearance within a reasonable range.

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