Aluminum Laptop Shell Right-Angle Bending Without Wrinkles or Cracks
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Solution Overview
Problem
Conventional laptop shell manufacturing processes result in wrinkles, cracks, and unattractive round angle shapes during right-angle bending, leading to higher costs and potential cracking issues.
Innovation Solution
A method involving cutting, stretching, shaping, and necking an aluminum alloy plate to form a primary blank body with avoidance notches, allowing for precise vertical connections between the side and hinge bending parts, enhancing strength and reducing material waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional bending process is used to mold the upper shell, then the manufacturing cost is reduced, but the bending part develops wrinkles and cracks
Solution Approach 1:
The bending process is divided into multiple sequential steps: first bending the side bending part, then bending the hinge bending part, and finally performing necking. This segmentation allows each bending operation to be controlled independently, preventing wrinkles and cracks that occur in one-step bending while maintaining cost-effectiveness compared to CNC processing.
Solution Approach 2:
The avoidance notch is pre-formed on the aluminum alloy plate before bending operations. This preliminary action creates a controlled weak point that directs the bending deformation away from critical areas, preventing crack initiation at the bending connection parts while maintaining surface quality throughout the subsequent bending steps.
2Device complexity
If conventional bending process is used, then the process is simple, but the bending connection part forms round angle shape which is unattractive
Solution Approach 1:
The bending process is divided into two separate bending operations followed by a necking operation. The first bending creates the side bending part, the second bending creates the hinge bending part, and the necking operation forms the sharp right angle at the connection part. This segmented approach achieves sharp angles without requiring complex tooling.
Solution Approach 2:
The necking operation changes the geometric parameters of the bending connection part by applying controlled compression, transforming the rounded angle from previous bending steps into a sharp right angle. This parameter change achieves the desired sharp appearance while using simple equipment.
3Productivity
If one-step bending is used to mold the upper shell, then the manufacturing process is efficient, but cracking and stacking problems occur at the hinge assembly side
Solution Approach 1:
The bending process is segmented into sequential operations: first bending the side bending part, then bending the hinge bending part, and finally necking. This segmentation allows stress to be distributed across multiple controlled deformation events rather than concentrated in one step, preventing cracking at the hinge assembly side while maintaining overall manufacturing efficiency.
Solution Approach 2:
The avoidance notch is created before bending to pre-determine the deformation path. This preliminary action guides the material flow during subsequent bending operations, ensuring that stress concentrates in safe areas away from the hinge assembly side, thereby preventing cracks while maintaining structural integrity.
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 method ensures vertical connections without overlapping, reduces manufacturing costs, and improves the aesthetic appeal and structural integrity of the laptop shell.
Implementation Method 1
extruding downward the aluminum alloy that is cut, such that a bending part is formed on the outside of the primary blank body
Implementation Method 2
applying one pressure on the side bending part toward the hinge bending part, and limiting position at the hinge bending part to limit bending at the hinge bending part
Implementation Method 3
applying a downward pressure to the necking part to make the necking part bends downward until being parallel with a top surface of the primary blank body
Data Source
AI summary
A method for shell right angle bending process is provided, which belongs to the field of shell processing. The method includes cutting an aluminum alloy plate into a primary blank body, arranging an avoidance notch on an outside of the primary blank body, extruding downward the aluminum alloy to form a side bending part and a hinge bending part on the outside of the primary blank body, applying a pressure on the side bending part toward the hinge bending part to make the side bending part and the hinge bending part vertically connected, applying a pressure on a top of the side bending part and a top of the hinge bending part toward a central axis of the primary blank body, then applying a downward pressure to the top of the side bending part and make it parallel with a top of the primary blank body.