A netizen left a message below the video asking, what material is good for 2.0 copper stretching? There will be no subtle vertical lines on the appearance.
Vertical lines on the appearance of stretched parts are usually caused by adhesive wear of the adhesive material, which is generally due to the presence of microscopic cracks in the microstructure of the die steel that are invisible to the naked eye. Therefore, choosing non adhesive die steel for stretching molds is a fundamentally effective solution to solve vertical lines.
The general direction of material selection is tungsten steel, powder high-speed steel, or coating for molds. Regardless of which tool steel is chosen, non stick material is the key. Due to the uncertainty of mold size, product quantity, and manufacturing cost acceptance, it is not possible to provide specific tool steel grades.
But to be honest, with a 2.0 stretch of copper, PM23 powder high-speed steel is a safer choice for products without vertical lines in appearance.
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