Die Casting Nozzle with Rapid Thermal Cycling for Sprue Sealing
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Solution Overview
Problem
Conventional die casting processes with sprues result in additional material input, energy losses, and quality issues due to slag and oxide formation, and existing solutions face challenges with thermal inertia and productivity, making it difficult to seal and re-fuse the sprue section efficiently.
Innovation Solution
A die cast nozzle with a heating cartridge and heatable nozzle components that achieve a high power density and low thermal inertia, allowing for rapid temperature changes to form a solidified plug that seals the sprue section, preventing reflow and maintaining the melting in a liquid state for efficient casting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a plug of solidified melting is used to seal the sprue section, then reflow prevention is improved, but the cycle time increases due to the need for controlled re-fusing
Solution Approach 1:
The patent applies parameter changes by rapidly altering the temperature of the nozzle tip through high-power heating elements. The temperature is quickly raised above the melting point to re-fuse the solidified plug, and then rapidly cooled to maintain sealing. This dynamic temperature control enables both reliable reflow prevention and reduced cycle times compared to conventional slow heating methods.
Solution Approach 2:
The patent implements periodic action through cyclic heating and cooling of the nozzle tip. The heating element is activated periodically to re-fuse the plug at the start of each casting cycle, and then deactivated to allow cooling and sealing. This periodic operation pattern enables efficient cycling between sealing and re-fusing states, reducing overall cycle time while maintaining reliability.
2Productivity
If external heating is used to keep melting liquid, then productivity is improved, but thermal inertia causes long cycle times
Solution Approach 1:
The patent applies local quality by concentrating heating power specifically at the nozzle tip rather than heating the entire nozzle and mold uniformly. The high-power heating element is localized to the precise area where the plug forms and where melting temperature maintenance is critical. This localized heating reduces thermal inertia effects and enables faster temperature changes, thereby reducing cycle times while maintaining high productivity.
Solution Approach 2:
The patent implements dynamics by using a controllable, high-power heating element that can rapidly adjust its output. The heating power is dynamically increased when re-fusing the plug and dynamically reduced or shut off when sealing is required. This dynamic control allows the system to adapt quickly to different process stages, overcoming thermal inertia and enabling short cycle times without sacrificing productivity.
3Stability of the object's composition
If conventional heating elements are used, then even temperature distribution is achieved, but thermal inertia prevents dynamic operation
Solution Approach 1:
The patent applies dynamics by replacing conventional low-power heating elements with a high-power, controllable heating element that can rapidly adjust its output. This dynamic heating element can quickly raise or lower the temperature at the nozzle tip, enabling the system to switch between sealing and re-fusing modes within short timeframes. This dynamic capability significantly improves productivity while maintaining temperature control.
Solution Approach 2:
The patent implements parameter changes by using a heating element with variable power output that can rapidly change the temperature parameter at the nozzle tip. The heating power is adjusted according to the process requirements: high power for re-fusing, low or zero power for sealing. This rapid parameter change capability overcomes thermal inertia and enables dynamic operation, improving productivity while maintaining stable temperature distribution when needed.
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 solution enables high productivity with short cycle times, prevents reflow and energy losses, and maintains the quality of cast parts by avoiding oxide and slag formation, while extending the service life of the nozzle components.
Implementation Method 1
a plug of solidified melting can be formed that interrupts the melting flow
Implementation Method 2
the heating zone (6) comprises a heating cartridge (2) and/or a heatable nozzle shaft (33') and/or the nozzle tip (8) is comprised as heatable nozzle tip (8')
Implementation Method 3
which comprises high power density in at least one section and low thermal inertia, comprised in a way that a temperature change gradient of 20 to 250 K/s, preferably 150 K/s, can be achieved on the surface of the heating element
Data Source
AI summary
Die cast nozzle for use in a die casting hot chamber system for molten metal with at least melting channel (4) in a channel carrier (3) that can be connected to a melt distributor (21), wherein the melting channel (4) passes over into a heating zone (6) and a nozzle tip (8), to which a sprue area (10) is attached, in which a plug of solidified melting can be formed that interrupts the melting flow, wherein the heating zone (6) comprises a heating cartridge (2) and/or a heatable nozzle shaft (33′) and/or the nozzle tip (8) is comprised as heatable nozzle tip (8′) and comprises at least one heating cartridge (2), the heatable nozzle shaft (33), or the heatable nozzle tip (8′) as heating element with electric heating, which comprises high power density in at least one section and low thermal inertia, comprised in a way that a temperature change gradient of 20 to 250 K/s, preferably 150 K/s, can be achieved on the surface of the heating element. A method for operating the die cast nozzle is also the subject matter of the invention.