Wiper die is used to prevent wrinkles from inner wall compression on the inside radius during the bending process. It is used in conjunction with ball mandrels. A mandrel cannot control the inherent wall compression at the inside of the bend. A compression causes the tube wall at the inside of the bend to wrinkle if the wiper die is not used. Wiper dies are frustrating tools in the setup for many reasons.
Wipers operate electrically and speedometer includes trip indicator. The wipers are subjected to high temperature when the separator is used as the receiving unit in the drying system. The wipers are inspected periodically for wear and damage. Each wiper has slotted fastening holes and adjusted to the screen as wear occurs. The wipers are made for all planes with speeds up to 300 MPH. Wipers serve to bridge together the individual contacts and the circular strips.