Channel: Autoglass
Safety Glass Experts International: How to bend perfect shapes (part 1)

2011-09-01 | Autoglass

Modern vehicle windshield design is introducing many challenges to the manufacturers. In this two-part article, I will discuss the processing challenge created by windshield surface geometry and edge shape. In the first part, I will focus on how to bend perfect wing areas and edge shapes. In the second part, I will review the processing functions and requirements to produce progressive sagging. Bending wing curvature and edge shapes requires multiple functions in terms of operational actions and mould tooling. There are several approaches to achieve the correct shape, but the same principles apply in all successful results. Sometimes manufacturers seem to run into a dead end while developing new models. This article will give new information and perspectives to gain better results.

Safety Glass Experts International: How to bend perfect shapes (part 1)
MODERN DESIGN FEATURES
To understand the challenges created by modern design it is necessary to review these design features. Trends in vehicle windshield design feature: increasing size, complex edge shapes and contour surface geometry (deep sagging). Modern shapes can include extending curves to the roofline and wrap around corners. The trend of car windshields is moving in the direction of tall windshields with deep bends, larger bending radius, less aggressive edge shapes, without the previously popular wrap around corners. Bulky installation frames are also in the past and the entire outer surface of the windshield is left visible. Wrap around corners are now often replaced with separate A-pillar glazing, but the size, sagging and bending depths continue to increase. Car windshield geometry is already beyond the point of 30-millimetre cross curvature requirements. The extreme end in regards of windshield height is the design where the windshield extends to the vehicle roofline. This design increases size, bending depth (even up to 500 millimetres) and sagging significantly, therefore setting up certain manufacturing equipment requirements regarding the physical size of the bending wagons/furnace chambers and availability of sophisticated IR-heating controls.
In larger windshield design trends, buses, special vehicles and coaches, the wrap around corners still remain and introduce increasing bending depths >600 millimetres. Cross curvature (sagging) requirements in...

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Article taken from Glass-Technology International bi-monthly magazine (6 issues per year)
Year: 2011 number: 5
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