Cavity Sizing via Protrusion Plastic Deformation
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Solution Overview
Problem
Existing methods for manufacturing parts with tight tolerance cavities, such as powder injection molding, casting, and additive manufacturing, often result in rough surfaces and large dimensional tolerances, requiring secondary machining for precision fits, and struggle with complex geometries like curved openings.
Innovation Solution
A method involving the formation of deformable protrusions within cavities that are plastically deformed using a deforming element to increase the cavity dimension to precise sizes, allowing for tighter tolerances and eliminating the need for additional machining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If additive manufacturing, powder injection molding, or casting is used to make complex geometry parts with openings, then complex geometries and difficult-to-machine shapes can be produced, but the openings have rough surface finish and large dimensional tolerance
Solution Approach 1:
The cavity is pre-formed with protrusions that extend into the cavity space during the initial manufacturing process (additive manufacturing, powder injection molding, or casting). These protrusions are then plastically deformed in a subsequent step to precisely control the final cavity dimensions, eliminating the need for secondary machining while achieving tight tolerances
Solution Approach 2:
The method changes the physical state and dimensions of the protrusions through plastic deformation. By applying controlled deformation forces, the protrusions are compressed and reshaped to achieve the desired final cavity dimension, transitioning from a rough pre-formed state to a precision-finished state without traditional machining
2Ease of manufacture
If additive manufacturing, powder injection molding, or casting is used to make complex geometry parts, then difficult-to-machine curved openings can be produced, but secondary machining is required to achieve precision fit
Solution Approach 1:
The cavity geometry including curved openings is pre-formed during the initial manufacturing process, and protrusions are strategically positioned within the cavity. The subsequent plastic deformation of these protrusions achieves the precision fit directly, eliminating the need for secondary machining operations and reducing overall process complexity
Solution Approach 2:
The method extracts the precision-fitting function from the traditional secondary machining process and integrates it into the forming process itself. By using plastic deformation of protrusions to directly achieve the desired cavity dimensions, the separate machining step is eliminated while maintaining precision requirements
3Manufacturing precision
If traditional machining is used to create tight tolerance cavities, then precise dimensional control can be achieved, but the process complexity increases for multiple openings at different angles and curved openings become difficult or impossible to machine
Solution Approach 1:
Instead of using complex machining operations to achieve tight tolerances, the method changes approach by using plastic deformation of protrusions. This allows precise dimensional control through controlled material flow and deformation, achieving the same precision as machining but with simpler equipment and processes
Solution Approach 2:
Rather than removing material through machining to achieve the desired cavity shape and tolerance, the method inverts the approach by forming the cavity with protrusions that are then deformed inward. This reverse engineering approach achieves precision fitting without the complexity of traditional subtractive machining
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 enables the production of parts with tighter dimensional tolerances and complex geometries without the need for secondary machining, improving precision and reducing manufacturing complexity.
Implementation Method 1
pressing a deforming element against the distal ends of the protrusions to plastically deform the protrusions toward the at least one internal surface of the cavity
Data Source
AI summary
A method of sizing a cavity in a part and a part made from such method. The method includes forming the part having the cavity, including forming a plurality of protrusions extending within the cavity from at least one internal surface of the cavity, the protrusions having distal ends bordering an unobstructed portion of the cavity, the unobstructed portion having an initial dimension at least partially defined by a position of the distal ends, pressing a deforming element against the distal ends of the protrusions to plastically deform the protrusions toward the at least one internal surface of the cavity and increase the initial dimension to a final dimension, and disengaging the deforming element from the distal ends.