Low-Pressure Casting Control for Constant Pre-Pressure Timing

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing low-pressure die casting (LPDC) processes lack stability and predictability due to varying pre-pressurization times based on different holding furnace levels, leading to inconsistent productivity and reliability.

Innovation Solution

A method and machine that control the overall pre-pressure time by varying the pre-pressure application speed and/or starting time based on the holding furnace level, ensuring a constant pre-pressure time across different furnace levels, allowing coordinated pre-cooling and improved process stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the pre-pressure application time is not controlled to be constant across different holding furnace levels, then the casting process can adapt to different furnace levels, but the process stability and productivity consistency deteriorate

Engineering Contradiction:

Improveadaptability to different holding furnace levelsVSAvoidprocess stability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent applies dynamics by making the pre-pressure application process adaptive rather than fixed. The control system dynamically adjusts the pre-pressure application parameters (time, pressure level) based on the detected holding furnace level, transforming a static process into a dynamic one that responds to varying conditions while maintaining consistent outcomes

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent implements feedback by using a level detector to monitor the holding furnace level and using this information to control the pre-pressure application. The control system receives feedback about the furnace level and automatically adjusts the pre-pressure parameters accordingly, creating a closed-loop control system that ensures process stability across different operating conditions

Inventive Principle:

Principle #23Feedback

2Adaptability or versatility

If the pre-pressure application time varies with holding furnace level, then the system can accommodate different furnace configurations, but the productivity and process predictability worsen

Engineering Contradiction:

Improveaccommodation of different furnace configurationsVSAvoidproductivity consistency

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The patent applies parameter changes by systematically varying the pre-pressure application parameters (time, pressure) based on the holding furnace level. The control system modifies these parameters according to the detected level, ensuring that the casting process maintains optimal conditions and consistent productivity across different furnace configurations and operating conditions

Inventive Principle:

Principle #35Parameter changes

3Ease of operation

If the pre-pressure application is not coordinated with pre-cooling, then the process is simpler to control, but the casting quality and process optimization deteriorate

Engineering Contradiction:

Improvecontrol simplicityVSAvoidcasting quality

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The patent merges the pre-pressure application control with the pre-cooling control into a unified coordinated process. The control system synchronizes these two operations based on the holding furnace level, ensuring that both parameters are optimized together rather than independently, thereby improving casting quality while maintaining manageable control complexity

Inventive Principle:

Principle #5Merging (Combining)

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 approach stabilizes the LPDC process, ensuring consistent quality and productivity by maintaining uniform conditions for casting components, regardless of the holding furnace level, and enabling advanced programming of pre-cooling and other process steps.

Implementation Method 1

a pressure control system set up to apply pre-pressure to the molten metal in the holding furnace to force the molten metal through the riser tube

Methodology Applied

Scientific EffectPressure gradient: Pressure Gradient

Implementation Method 2

The cooling medium usually circulates through channels within the casting mold to absorb heat and lower the mold's temperature

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentEP4640339A1Low pressure casting method, low pressure casting machine and use of low pressure casting machine

Publication Date: 2025.10.29 NEMAK SAB DE CV

Figure 1
Figure 2
Figure 3

AI summary

The inventio relates to a low pressure die casting method, comprising, preferably in the given time sequence, the steps of: holding a molten metal (6) in a holding furnace (8) at a certain holding furnace level (10), optionally pre-cooling a casting mold (4), pre-pressuring the molten metal (6) in the holding furnace (8) starting from a certain pre-pressure application starting time at a certain pre-pressure application speed to force the molten metal (6) from the holding furnace (8) through a riser tube (12) to the casting mold (4), and injection of the molten metal into the casting mold (4) under low pressure, wherein a certain overall pre-pressure time is preset by varying the pre-pressure application speed depending on the holding furnace level (10) and/or the pre-pressure application starting time depending on the holding furnace level (10). The invention also relates to a low pressure die casting machine and a use of a low pressure die casting machine.