Flashless Extrusion Welding Mold and Heating System
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Solution Overview
Problem
The existing welding processes for extruded materials often result in undesirable seams or flash, which are costly to remove and can weaken the joint, especially in sealing applications where flash removal can lead to tears and material loss.
Innovation Solution
A system that uses molds and clamps to position and heat extrusion ends, allowing for a seamless weld by preventing flash formation or reforming it into the extrusion cross-section, with optional heater molds for controlled thermal processing and reduced swelling, ensuring a strong and flashless connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional welding processes are used to join extrusion ends, then the ends can be connected, but flash and seams are generated that require costly removal operations and can weaken the joint
Solution Approach 1:
The patent converts the harmful flash by designining a mold cavity that captures and redirects flash material back into the extrusion cross-section. The mold includes a cavity positioned to receive flash and a reforming mechanism that forces flash back into the material body, transforming the harmful byproduct into a beneficial reinforcement of the joint area.
Solution Approach 2:
The patent introduces a specialized mold as an intermediary between the welding process and the final product. This mold acts as a mediator that controls flash formation and redirection, preventing flash from escaping as a defect while maintaining the welding process effectiveness. The mold cavity serves as the intermediary structure that captures and reformes flash material.
2Manufacturing precision
If mechanical trimming operations are used to remove flash, then flash can be removed, but important parts of the finished product can be trimmed away through operator error or machine overshoot
Solution Approach 1:
The patent performs the flash control action during the welding process itself rather than as a subsequent trimming operation. The mold is in place during welding and proactively captures and reformes flash before it can become a separate defect requiring removal. This preliminary action eliminates the need for post-weld trimming that could cause dimensional errors or material loss.
Solution Approach 2:
Instead of removing flash as a harmful byproduct, the system converts flash into a beneficial feature by reforming it back into the extrusion cross-section. This eliminates the need for trimming operations that could cause operator error or machine overshoot, thereby preventing material loss and maintaining dimensional accuracy.
3Strength
If heating elements are used during welding, then the extrusion ends can be joined, but flash is generated that requires additional removal operations
Solution Approach 1:
The patent merges the welding process with the flash control function by integrating the mold cavity directly into the welding apparatus. The heating element, mold cavity, and flash reforming mechanism work as a unified system during the welding operation, eliminating the need for separate flash removal operations and reducing overall process complexity.
Solution Approach 2:
The heating element enables the welding process while the integrated mold simultaneously manages flash by redirecting it back into the material. This combination allows the heating and flash control functions to work together during the same operation, maintaining weld strength while eliminating the need for additional flash removal steps.
4Manufacturing precision
If flash removal operations are performed, then flash can be eliminated, but the cost of additional operations and labor increases significantly
Solution Approach 1:
The mold performs flash control as a preliminary action during the welding process itself, preventing flash from becoming a separate defect that would require later removal. By addressing flash formation during the primary welding operation, the system maintains seamless appearance without requiring additional post-processing steps, thereby preserving production efficiency.
Solution Approach 2:
The system converts flash from a harmful byproduct requiring costly removal into a beneficial material that is reforme d back into the extrusion cross-section. This eliminates the need for separate flash removal operations, maintaining both seamless appearance and high production efficiency by combining both functions in one step.
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 system achieves a strong, seamless weld without flash, reducing manufacturing costs and maintaining the extruded material's specifications, while enhancing the integrity and appearance of the connection.
Implementation Method 1
Heat is applied through a heating element during a welding operation at the extruded material ends
Implementation Method 2
The molds are closed on the still molten material at the weld joint or splice. This compression action either prevents the flash from forming or reforms the flash back into the body of the extrusion cross section
Data Source
AI summary
A method and apparatus for welding two separate ends of an extrusion or two separate extrusion ends to form a flashless extrudate or gasket by having a first and a second mold for supporting and clamping the extrusion ends, and a spacer bar for positioning the extrusion ends to a location within the mold. A heating element elevates the temperature of the extrusion ends to a welding condition, and a clamping device is used for securing the extrusion ends. A flashless welding operation results by inserting and clamping at least one heated extrusion end into a welding mold until an acceptable contact pressure is obtained against the opposing heated extrusion end.