Semi-Solid Casting Machine with Progressive Thermal Management
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Solution Overview
Problem
Current die-casting processes for light metal alloys, such as magnesium, face challenges with high energy consumption, material contamination, and porosity due to superheating, leading to poor casting quality and environmental concerns, particularly in the automotive industry.
Innovation Solution
A casting machine design featuring a thermally conductive block with a processing cylinder and adjacent injector cylinder, where the feedstock is progressively heated and injected into a mold using a plunger, minimizing energy use and eliminating the need for SF6 gas, while maintaining the feedstock in a semi-solid state to reduce porosity and improve casting integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If superheated melting is used to overcome cooling losses in melt transfer, then the melt temperature is maintained at 700°-780° C., but energy consumption increases significantly
Solution Approach 1:
The feedstock is preheated in a separate preheating zone before entering the injection cylinder, so that the material arrives at the injection point already at elevated temperature. This preliminary heating action reduces the energy required during the actual injection process and eliminates the need for continuous superheating of the entire melt volume.
Solution Approach 2:
The heating process is divided into separate zones: a preheating zone for initial temperature elevation and an injection zone for final temperature maintenance. This segmentation allows energy to be applied efficiently only where and when needed, rather than heating the entire melt volume to superheated temperatures.
2Productivity
If high speed injection is used to complete casting before solidification, then cycle time is reduced, but turbulence causes extensive inclusions in castings
Solution Approach 1:
The feedstock is injected in a semi-solid state rather than fully liquid, fundamentally changing the physical parameter of the material. This semi-solid state allows the material to flow into the mold cavity at lower speeds without turbulence, eliminating inclusion formation while still achieving complete cavity filling before solidification begins.
Solution Approach 2:
The process utilizes the phase transition region between solid and liquid states. By injecting material in this semi-solid phase, the process exploits the unique properties of partially melted material that combines flowability with structural integrity, avoiding the turbulence problems of fully liquid injection while maintaining productivity.
3Use of energy by moving object
If feedstock is heated progressively in a thermally conductive block, then energy consumption is reduced, but the device complexity increases
Solution Approach 1:
The preheating function is merged into the injection cylinder structure itself by incorporating a thermally conductive block with integrated heating elements. This combination eliminates the need for separate preheating equipment while achieving efficient energy use through progressive heating as material moves through the cylinder.
Solution Approach 2:
The thermally conductive block with integrated heaters provides self-service preheating as material passes through the injection cylinder. The structure itself performs the heating function without requiring external preheating equipment, and the progressive heating occurs automatically as material moves through the heated zones.
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 solution reduces energy consumption, minimizes material contamination, and enhances casting quality by maintaining the feedstock in a semi-solid state, resulting in parts with minimal porosity and improved mechanical strength, while also being more environmentally friendly by eliminating the use of SF6 and oil cooling.
Implementation Method 1
a heater thermally coupled to the processing cylinder. The heater and processing cylinder are configured to heat the feedstock such that the feedstock becomes progressively more liquid as it passes from the first to the second end of the processing cylinder
Implementation Method 2
A casting machine made in accordance with another aspect of the present invention includes a thermally conductive block having a processing cylinder and an adjacent injector cylinder formed therein. The block is thermally coupled to a heater.
Implementation Method 3
an injector plunger coupled to an injector actuator for driving the plunger sufficiently to force the metal from the shooting pot through the nozzle and into the mold
Data Source
AI summary
The present invention is a casting machine for casting parts in a mold out of a metal using a metal feedstock. The machine feeds solid metal feedstock into a processing cylinder formed in a thermally conductive block and a heater elevates the temperature of the feedstock as it passes along the said processing cylinder first and second ends, the first end of the processing cylinder being configured to receive. The feedstock becomes more liquid and is transferred to an injector cylinder formed in the thermally conductive block adjacent the processing cylinder. The injector cylinder has a shooting pot coupled to the second end of the processing cylinder by a passage configured to permit feedstock to pass from the processing cylinder into the shooting pot from where is it injected into a mold.