One way to reduce the equipmen

One way to reduce the equipment problems that occur during die casting is to apply a thin coating to the core pins. The paper “Tool Treatment Extends Core and Pin Life” (Die Casting Engineer, March/ April 1999: 88) reported on an experiment in which one group of core pins was coated using the traditional nitride process and a second group was coated using a new thermal diffusion process. Use the accompanying data to decide at significance level .01 whether there is strong evidence for concluding that true average lifetime for the thermal treatment is more than four times that of the nitride treatment.

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