Overmolded Palnut Panel Assembly to Prevent Automotive Detachment
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Solution Overview
Problem
Adhesively attached palnuts in vehicle components often detach during shipment or assembly, causing delays in vehicle assembly and requiring reattachment or replacement.
Innovation Solution
A panel assembly system where a palnut is integrated into a panel body through injection molding, with a flange extending into a channel and a variable flange width to secure the palnut, preventing detachment by embedding it within the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If adhesives are used to attach palnuts to panels, then the attachment process is simple and quick, but the palnuts may detach during shipment or assembly
Solution Approach 1:
The patent merges the palnut attachment process with the panel injection molding process into a single integrated operation. The palnut is positioned in the mold cavity before injection, and the molten plastic flows around and encapsulates the palnut's flange, creating a permanent mechanical bond. This eliminates the separate adhesive attachment step while ensuring reliable, permanent fixation that cannot detach during shipment or assembly.
Solution Approach 2:
The patent replaces the chemical bonding mechanism (adhesives) with a mechanical bonding mechanism (injection molding). The molten plastic acts as a mechanical anchor, physically interlocking with the palnut flange through the molded cavity geometry. This mechanical substitution provides more reliable attachment than adhesives while maintaining manufacturing efficiency.
2Ease of manufacture
If palnuts are adhesively attached to panels, then initial attachment is easy, but reattachment or replacement is required when detachment occurs
Solution Approach 1:
The patent performs the attachment action preliminarily during the panel manufacturing stage itself. The palnut is secured to the panel through injection molding before the panel is shipped or assembled into the vehicle. This preliminary action ensures the palnut is permanently fixed in advance, eliminating any possibility of detachment that would require reattachment or replacement during vehicle assembly, thus preventing time loss.
3Reliability
If injection molding is used to integrate palnuts into panels, then palnut attachment reliability is improved, but the manufacturing process complexity increases
Solution Approach 1:
The patent combines two previously separate manufacturing operations (panel injection molding and palnut attachment) into a single integrated process. By positioning the palnut in the mold cavity before injection, the palnut becomes an integrated part of the panel through the molded plastic. This merging eliminates the need for separate attachment equipment and processes, actually reducing overall manufacturing complexity while improving reliability.
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
Ensures the palnut remains securely attached to the panel, preventing detachment during shipment and assembly, facilitating efficient vehicle assembly without the need for reattachment or replacement.
Implementation Method 1
A mold assembly is provided including an ejector die, a cover die, and a palnut positioned on the ejector die. The cover die is mated to the ejector die to form a cavity. Liquid plastic is injected into the cavity to form a panel body encapsulating the flange.
Implementation Method 2
The liquid plastic is allowed to cure and solidify within the cavity, resulting in a panel with the palnut encapsulated within the panel body.
Data Source
AI summary
A panel assembly for an automotive component has a panel. The panel includes a panel body having a first side and a second side formed on an opposite side from the first side, and an interior wall extending between the first side and the second side to define an aperture extending at least partially through the panel body, the interior wall including a channel formed therein. The panel assembly further has a palnut including an interior portion having a plurality of teeth cooperating to define a fastener opening and a flange surrounding the interior portion. The flange is received within the channel formed in the interior wall of the body.