For the die pad of the extruder, the backing plate for the transition between the die and the machine table does not need to be too hard, but it needs to have sufficient thickness and area. If the backing plate is too hard, it will damage the machine table. How many tons of extruder are used? And then select the appropriate material of the die pad.
Suggestion: the backing plate in the mold shall be Cr12MoV and quenched at 55HRC. It is recommended to use 40Cr as the backing plate between the machine tools of the mold, with a large area and thick thickness. The hardness shall be adjusted and tempered to 28hrc. This can protect the machine table from damage.
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