4. Wiper Shoe
Tool Selection guide
indicate when a wiper shoe required.
In many instances draw
bends are required in material is too hard, too thin, or shaped in such a
manner that the metal on the inside radius of the bend forms a hump or
series of wrinkles. The function of a wiper die is to fill the gap behind
the bending form and confine the metal into a smooth, wrinkle free
compression on the inside radius.
Engineering Wiper shoe are precision cut from pre-formed blanks of alloy
steel, Hard chrome plated for non ferrous or mild steel tube, or from an
aluminum bronze alloy for stainless steel or other high tool pressure
applications. For reduced tube drag, tube grooves are ground and lubes each
tube and wiper shoe. Wiper shoe must be content 80% with bending die for