ACM Panel Tapping With Continuous Burrs for Thin Screw Joints
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Solution Overview
Problem
The thin ACM panels used as back covers in OLED display devices lack sufficient depth for forming a tap with strong screw fastening strength, leading to increased manufacturing costs due to the need for auxiliary parts like reinforcement plates or PEM nuts.
Innovation Solution
A tap processing method that involves inner and outer burring operations using a scrapless burring punch (SBP) to form continuous burrs within the ACM panel, which are then tapped to create a screw thread without the need for additional auxiliary parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the ACM panel thickness is reduced to meet design requirements, then the aesthetic appearance and device thinness are improved, but the screw fastening strength deteriorates due to insufficient tap depth
Solution Approach 1:
The burring process is divided into two separate operations: inner burring from the inner skin side and outer burring from the outer skin side. This segmentation allows each operation to focus on creating burrs in specific regions, ensuring complete penetration and interlocking without requiring excessive panel thickness
Solution Approach 2:
Burring operations are performed before the tapping operation to pre-form the metal edges and compress the core layer. This preliminary action creates favorable conditions for subsequent thread formation, enabling strong fastening in thin panels
2Reliability
If auxiliary parts like reinforcement plates or PEM nuts are added to improve screw fastening strength, then the fastening reliability is improved, but the manufacturing cost increases due to additional components
Solution Approach 1:
The ACM panel itself is modified through burring and tapping operations to provide the necessary fastening strength. The panel serves its own fastening function without requiring external auxiliary parts, eliminating additional components and reducing manufacturing complexity
Solution Approach 2:
The physical and mechanical properties of the ACM panel are altered through burring (compressing the core layer) and tapping (forming threads). These parameter changes enable the panel to achieve sufficient fastening strength intrinsically, replacing the need for auxiliary reinforcement components
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
This method enhances the screw fastening strength by compressing the resin core layer, allowing for stable attachment of the system board to the back cover without additional components, thereby reducing manufacturing costs and improving productivity.
Implementation Method 1
an inner burring operation of burring the inner skin of the ACM panel so that an inner burr formed in the inner skin extends toward the outer skin while compressing the core layer
Data Source
AI summary
A tap processing method for an aluminum composite material (ACM) panel includes an inner burring operation of burring the inner skin of the ACM panel so that an inner burr formed in the inner skin extends toward the outer skin while compressing the core layer, an outer burring operation of burring the outer skin of the ACM panel so that the outer burr formed in the outer skin extends toward the inner skin while compressing the core layer and the inner burr and the outer burr are also continuously connected to each other, and a tapping operation of forming a continuous screw thread in the inner burr and the outer burr continuously connected to each other. Burring work in the inner burring operation and the outer burring operation is performed by a scrapless burring punch (SBP).