Piston Blank Forging With Selective Flange Reheating
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Solution Overview
Problem
Conventional piston blank forging methods result in heavy, top-heavy flanges that require substantial machining to form cooling channels, making it difficult to achieve a near-net shape piston blank with predictable and repeatable dimensions.
Innovation Solution
A forging process that involves heating and shaping a cylindrical steel billet to form a near-net shape piston blank by creating a flange over a recess without removing material from the core, allowing for the subsequent bending of the flange to form a closed cooling channel, potentially using induction heating and spin forming techniques to reduce material mass and machining requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional forging methods are used to create piston blanks, then the forging process is simple and robust, but the resulting blank has a heavy top-heavy flange requiring substantial machining
Solution Approach 1:
The forging process is divided into multiple stages: initial forging to form a preliminary flange, then selective reheating of the flange portion, and final forging to achieve near-net shape. This segmentation allows each stage to be optimized independently, achieving high dimensional accuracy without overwhelming process complexity
Solution Approach 2:
The preliminary flange is formed during the initial forging stage, creating a pre-shape that requires less material removal and subsequent forming operations. This preliminary action reduces the total machining required and sets up the workpiece for the selective reheating and final forging operations
2Loss of substance
If conventional forging methods are used, then equipment requirements are standard, but material waste is high due to substantial machining required
Solution Approach 1:
The method changes the thermal parameters by selectively reheating only the flange portion to a specific temperature range, and adjusts the forging parameters by applying controlled pressure during the final shaping stage. These parameter changes enable near-net shape formation that minimizes material waste while maintaining manufacturing efficiency
Solution Approach 2:
Instead of forging the entire piston blank to final shape in one operation, the method applies partial action by selectively forging only the flange portion after reheating, while leaving the skirt portion in its preliminary state. This reduces the total energy and force required compared to complete remanufacturing
3Manufacturing precision
If near-net shape forging is attempted with existing equipment, then material savings are achieved, but dimensional predictability and repeatability are poor
Solution Approach 1:
The preliminary flange formation during initial forging creates a consistent starting geometry that ensures repeatable dimensions. This pre-shaping action establishes a predictable baseline that subsequent selective reheating and forging operations can reliably build upon
Solution Approach 2:
The method applies local quality by selectively reheating only the flange portion to specific temperature parameters, while keeping the skirt portion at a different temperature state. This localized treatment ensures predictable dimensional outcomes in the critical flange area without requiring complex equipment modifications
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 process enables the production of a piston blank with reduced mass and minimal machining, achieving a near-net shape with consistent material savings and improved manufacturing efficiency.
Implementation Method 1
the pre-flange portion is heated by induction heating to bring that portion of the steel billet to temperatures where steel can be deformed
Implementation Method 2
the flange can then be spin bent to form a closed cooling channel
Data Source
AI summary
Methods for forging a piston blank are disclosed such that the forged piston blank is in a near-net shape and size of a final piston. Bending a flange to form a cooling channel can be done with reduced or no preliminary machining away of core material relative prior to bending the flange.