Roll Forming Line Automation, Part 1: Pre-notch Dies

Roll Forming IconWhat is the key that makes one manufacturer’s roll forming line enormously profitable and another manufacturer’s line marginal, even when they are producing similar products on the same model roll former? The key is to have the proper auxiliary systems and tooling such as presses, dies, and measuring systems.

It is the differences between, and the design criteria for, the different types of dies (both cut-off and pre-notch), the different types of presses and the different types of measuring systems and how the different types affect line speeds, part tolerances and part costs that this series of posts will cover. The subject of today’s post is the pre-notch die design.

Pre-Notch Dies: Use and Design

Pre-notch dies and sophisticated pre-notching systems are coming increasingly into use because of the economic implications of secondary operations. The following are the three basic pre-notching setups: stationary dies, “fly” dies, and rotary punching.

The stationary pre-punch die is basically a conventional stamping die, with some modifications for operation in a roll forming line, mounted in a variety of presses (mechanical, hydraulic or pneumatic) in a variety of ways.

“Flying” dies are dies that are made to move linearly along tracks built into a mechanical, pneumatic, or hydraulic press, as opposed to being fixed to the ram and bolster as stationary pre-notch dies are.

Rotary punching allows for perforated, slotted, tabbed, punched, or embossed patterns to be done by using a mating set of rolls, the diameter of which depends on the length of the pattern or multiples of patterns to be punched.

Click here for the next post, which covers blade cut dies!

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