tailieunhanh - Cost Factors Affecting Productivity P1

A mold’s productivity is ultimately measured by how many good parts it can produce over time. A mold that runs very fast but is frequently down for maintenance or repair will not produce at lowest part cost and highest productivity. Conversely, a mold that runs too slow but produces parts consistently over time is not optimal. The same can be said for each component in the injection molding system. One way to quantify productivity is to measure the total equipment productivity (TEP): TEP = Production hours (auto cycling) Parts made Scrap parts × × Available hours Hour Parts produced. | 3 Cost Factors Affecting Productivity A mold s productivity is ultimately measured by how many good parts it can produce over time. A mold that runs very fast but is frequently down for maintenance or repair will not produce at lowest part cost and highest productivity. Conversely a mold that runs too slow but produces parts consistently over time is not optimal. The same can be said for each component in the injection molding system. One way to quantify productivity is to measure the total equipment productivity TEP Tep _ Production hours auto cycling Parts made Scrap parts Available hours Hour Parts produced Figure Total equipment productivity TEP A good custom molder can achieve TEP s greater that 80 and good dedicated systems achieve values higher than 90 . Where Will the Mold Be Operated Condition of Ambient Shop Air We tend to assume that the mold will be operated under ideal conditions but this is typically not the case. The environment in the molding shop can vary from very cold to very hot from dry to very humid from clean to dusty and dirty. With sudden changes in any of these conditions a molding operation can be affected significantly. High humidity will affect the mold itself corrosion and will affect the cycle time productivity of the mold. Rapid temperature changes may even affect the operation of a machine and mold and lead to breakdowns and loss of production. A typical example A a molding shop operated eight identical machines in each of two parallel rows all were molding the same or very similar products with the same type of mold. They all worked fine except the last machine in one row which stopped frequently without apparent reason. After checking for machine problems such as possible power fluctuations poor cooling water supply etc. it was noted that this last machine was close to an emergency exit door which was supposed to be closed all the time however on some days the workers kept the door jammed open to improve the shop .

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