Adjustable Hood Support for Thermal Distortion Control
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Solution Overview
Problem
The hood panel in vehicle assembly experiences thermal expansion and contraction during electro-coating and painting, leading to potential distortion due to gravitational sagging and incomplete adhesive curing, which can result in repair needs and affect vehicle appearance.
Innovation Solution
A hood support apparatus with adjustable supports and a hood striker receiving bracket, featuring a truss assembly with adjustable legs and a transverse support bar, ensures proper alignment and secure holding of the hood panel during these processes, minimizing movement and distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the hood panel is held in a raised position during E-coat and painting, then adequate coverage and access are assured, but thermal expansion and gravitational sagging may cause distortion
Solution Approach 1:
The support apparatus incorporates adjustable legs with adjustable feet that can be modified in length and position. This dynamic adjustability allows the support system to compensate for thermal expansion and contraction of the hood panel during heating and cooling cycles, maintaining proper alignment and preventing distortion while keeping the hood in the required raised position throughout the E-coat and painting processes.
Solution Approach 2:
The support apparatus uses adjustable legs whose length parameters can be changed to accommodate thermal expansion. The adjustable feet can be positioned at different locations along the legs, allowing the support system to adapt to dimensional changes in the hood panel caused by thermal effects, thereby maintaining manufacturing precision despite parameter changes in the hood's dimensions.
2Manufacturing precision
If the hood panel is supported rigidly to prevent movement, then distortion is minimized, but adhesive curing may be incomplete due to restricted thermal strain
Solution Approach 1:
The adjustable support system provides controlled support that allows for thermal strain accommodation. The adjustable legs and feet can be positioned to provide support while permitting the necessary movement for complete adhesive curing, thus maintaining both positional precision and curing reliability.
Solution Approach 2:
The support apparatus allows parameter changes in leg length and foot position to optimize both hood panel positioning and adhesive curing conditions, enabling the system to adapt to the dual requirements of maintaining precision and allowing thermal expansion for complete curing.
3Adaptability or versatility
If the support apparatus is made adjustable in multiple directions, then adaptability to different hood positions is improved, but device complexity increases
Solution Approach 1:
The support apparatus is divided into separate adjustable components including individual legs with adjustable feet, and an adjustable crossbar. This segmentation allows each component to be adjusted independently in specific directions, providing comprehensive adaptability while keeping each individual component relatively simple and manageable.
Solution Approach 2:
The adjustable legs and feet serve multiple functions: they provide structural support, enable positional adjustment, and accommodate thermal expansion. This multi-functionality reduces the need for additional specialized components, thereby limiting the increase in device complexity despite the broad adjustment capabilities.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively maintains the hood panel in a stable position, preventing distortion and ensuring complete adhesive curing, thus enhancing the vehicle's appearance and reducing repair requirements.
Implementation Method 1
Parts of the body-in-white undergo thermal expansion in the paint system ovens and contraction as the parts cool. Thermal expansion of the hood panel may result in sagging or deflection caused by the force of gravity on the panel.
Implementation Method 2
Parts of the body-in-white undergo thermal expansion in the paint system ovens and contraction as the parts cool.
Data Source
AI summary
An apparatus for holding a hood of a vehicle open during e-coat application and painting. The apparatus includes a support incorporating first and second pairs of legs attached to spaced locations on right and left sides of an engine compartment. The two pairs of legs are connected at an upper portion of the legs. A hood support bar is connected to the upper portion of both the first and second pairs of legs and extends transversely across the engine compartment. A hood striker receiving bracket may be provided on the hood support bar. The apparatus is adjustable to position the hood striker receiving bracket in a range of vertical, transverse and longitudinal locations. The adjustability of the apparatus provides a flexible hood support that reduces thermal distortion or sag due to thermal load.