Die Casting Mold Insert Segmentation for Heat Check Reduction
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Solution Overview
Problem
Conventional die casting molds with large-dimensioned inserts face issues with heat checks due to uneven heat processing, leading to frequent repairs and increased costs, as the inserts' large size and volume result in thermal stress, causing cracks that are difficult to completely remove and often recur, necessitating time-consuming and costly replacement of the entire insert.
Innovation Solution
A die casting mold design featuring a first insert with a second, smaller-sized insert fitted within its recess, allowing for equal and sufficient heat processing of the depressed cavity portion, reducing the occurrence of heat checks and facilitating repair by replacing only the smaller second insert when necessary, thus minimizing repair time and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If large-dimensioned inserts are used for casting large parts, then the insert can accommodate the cavity, but uneven heat processing occurs causing thermal stress and heat checks
Solution Approach 1:
The insert is divided into a first insert and a second insert, where the second insert contains the depressed cavity portion and is fitted within the first insert. This segmentation allows the second insert to be heat-processed separately and equally throughout, preventing thermal stress and heat checks while still accommodating large cavity requirements.
Solution Approach 2:
The second insert is fitted within a recess of the first insert, creating a nested structure. The second insert protrudes from the first insert by a predetermined amount, allowing the cavity-forming portion to be heat-processed uniformly while the overall structure maintains the necessary volume for large part casting.
2Reliability
If the entire insert is replaced when heat checks occur, then the mold is restored, but repair time and costs increase significantly
Solution Approach 1:
By dividing the insert into first and second inserts, the system enables selective replacement of only the second insert when heat checks occur. This segmentation allows the smaller, cavity-containing second insert to be independently replaced, significantly reducing repair time and costs compared to replacing the entire large insert.
Solution Approach 2:
The design allows the second insert to be replaced independently when it develops heat checks, while the first insert is retained and reused. This selective replacement strategy reduces waste and minimizes repair time by recovering the still-functional first insert.
3Strength
If the insert is made with sufficient thickness for large parts, then structural integrity is maintained, but heat processing becomes uneven causing cracks
Solution Approach 1:
The insert structure is segmented into a first insert providing structural strength and a second insert containing the cavity. This allows the second insert to be heat-processed uniformly despite the overall large dimensions, while the first insert maintains the necessary structural integrity for large part casting.
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 die casting mold effectively reduces the occurrence of heat checks and extends the number of casting cycles by ensuring the second insert is evenly heat-processed, allowing for efficient and cost-effective maintenance by replacing only the smaller second insert, thereby reducing repair time and costs compared to conventional methods.
Implementation Method 1
the size of the second insert is minimized as to surround the depressed cavity portion... ensuring the second insert is evenly heat-processed
Implementation Method 2
Cracks, a cause of heat checks, are produced on the surface of the mold, repeatedly subjected to heating and cooling, due to thermal stress
Data Source
Figure 1
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Figure 4
AI summary
A fixed insert (12) on which a depressed cavity portion (16) is formed and a fixed mold body (11) for holding the fixed insert (12) are provided. The fixed insert (12) includes a first insert (31) and a second insert (33). The first insert (31) is held with the fixed mold body (11). The second insert (33) is fitted and held within a recess (32) formed on the first insert (31). The size of the second insert (33) is minimized as to surround the depressed cavity portion (16).