Curved Centrifugal Impeller Blade to Minimize Stamping Springback
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Solution Overview
Problem
Conventional sheet metal stamping of centrifugal impeller blades results in springback, causing deviations from the intended design, leading to increased workload, motor inefficiency, and potential component failure due to plastic deformation and elastic recovery.
Innovation Solution
A method involving forming a fold line on a primary blade and bending the bending region along this line towards the rotating axis to create a curved blade, stabilizing the shape and minimizing springback, thereby aligning the outlet airflow angle with the intended design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sheet metal stamping is used to produce blades, then manufacturing efficiency is improved, but springback causes deviation from intended blade profile
Solution Approach 1:
The patent applies preliminary action by pre-calculating and pre-compensating for springback effects during the blade profile design stage. The intended blade profile is deliberately modified beforehand to account for expected elastic recovery, so that after stamping and springback, the final blade achieves the desired geometric accuracy without requiring post-processing adjustments.
Solution Approach 2:
The patent employs parameter changes by adjusting the stamping process parameters, particularly the degree of plastic deformation and forming pressure. By optimizing these parameters, the patent minimizes elastic recovery while maintaining manufacturing efficiency, thus resolving the contradiction between productivity and manufacturing precision.
2Ease of manufacture
If blade profile deviates due to springback, then manufacturing process is simpler, but outlet angle increases causing excessive motor workload
Solution Approach 1:
The patent implements feedback by establishing a closed-loop process where actual blade profiles after stamping are measured and compared against target profiles. This feedback information is used to continuously optimize the stamping process parameters and profile compensation algorithms, ensuring consistent blade performance and preventing excessive motor workload while maintaining manufacturing simplicity.
3Manufacturing precision
If multiple die revisions are made to achieve accurate blade profile, then blade precision is improved, but production time increases
Solution Approach 1:
The patent eliminates iterative die revisions by performing all necessary profile adjustments through preliminary computational design and single-step stamping parameter optimization. The intended profile is pre-compensated for springback, allowing accurate blade production in one stamping operation rather than requiring multiple die revisions, thus resolving the contradiction between precision and production time.
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 reduces springback deviations, maintains motor efficiency, prevents excessive power input/output, and reduces mold adjustments, ensuring consistent blade performance and timely product delivery.
Implementation Method 1
The blade undergoes springback during sheet metal stamping, causing plastic deformation or separation to create stamped parts with specific shapes, sizes, and properties
Implementation Method 2
Over time, the internal stress is released, causing the sheet metal to revert slightly towards its original state, resulting in the springback
Data Source
AI summary
A method for preparing a curved blade of a centrifugal impeller including: providing a primary blade, forming a fold line on the primary blade, and bending a bending region of the primary blade along the fold line towards a rotating axis of the centrifugal impeller. The primary blade includes an inlet edge, an outlet edge, a blade root, and a blade top. The inlet edge is disposed oppositely to the outlet edge; the blade root is disposed oppositely to the blade top; the inlet edge and the outlet edge are each disposed between the blade root and the blade top; and a vertex is defined at a joint of the outlet edge and the blade top. The fold line includes a first point and a second point; the first point is defined on the outlet edge; the second point is defined on the blade top.