The Life Of a Screw and Barrel
|Estimated Life Expectancy
It is very difficult to estimate the life expectancy of a screw or barrel. Due to many variables effecting productivity, each barrel and screw is unique. However, the primary cause of premature deterioration is excess wear; and wear causes problems that result in the loss of production yield.
Another cause of adhesive wear is using matched-steel components. For example, using a screw and a barrel both manufactured from D-2 steel, and heat treated to the same value, will cause a high coefficient of friction, which in turn results in galling of the components.
Other factors that may cause adhesive wear include:
Who Controls the Life Expectancy of a Screw and Barrel?
The person who purchases the new screw and barrel is the one who has control over the life expectancy. If the unit is purchased based on price alone, and the components are not of the correct grade of steel for the application, the life will be greatly reduced. Or, if the screw design is not close for the application or the cycle run, the life span can be reduced.
How Much Wear is Too Much on a Barrel, Screw, and/or Check Valve?
This question can not be answered by simply measuring your barrel and screw simply because some materials are more efficient than others when molding with worn components. You must measure your lost production yield. If you can not schedule around the wear, and you are losing production yield, it's time to add up the lost dollars. It's simple math. How much money are you losing in lost production yields versus the cost of a new unit?
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