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The division of labor between integrated die-casting and low-pressure casting in structural components

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  • Время выпуска: 2026-11-04

The division of labor between integrated die-casting and low-pressure casting in structural components
Integrated die casting is suitable for large thin-walled parts weighing over 6000 tons, while low-pressure casting is suitable for small and medium-sized complex internal cavity parts. The two complement each other.
Draw the first boundary line for tonnage
Integrated die-casting commonly uses 6000-12000 ton machines, with a large projection area per piece. Machines weighing less than 4000 tons have no economic viability for producing large-scale integrated components.
Low pressure casting machines are mostly in the range of 100-800 tons, suitable for structural components weighing less than 50kg per piece. The difference in equipment investment is one order of magnitude.
Before choosing a process, check the dimensions of the parts first. Thin walled parts with a projected area exceeding 1 square meter have a significant advantage in die-casting rhythm.
The economy of rhythm and batch production
The single piece cycle time of integrated die-casting can be compressed to 60-120 seconds, suitable for platform based vehicle models with an annual output of over 200000 pieces.
The single mode cycle of low-pressure casting is usually 5-15 minutes, and an annual production of less than 100000 pieces is more suitable. When the batch is insufficient, it is difficult to amortize the high mold investment for die-casting.
The investment for a single set of integrated die-casting molds often ranges from 10 million to 30 million yuan. This level can only be sustained by platform models.
The complexity of the internal cavity determines the upper limit of the process
Low pressure casting can use sand cores to form complex cavities, suitable for structural components with cavities such as sub frames and brackets.
Die casting is limited by demolding, and the inner cavity must be along the mold opening direction. The inverted structure requires sliders, and too many sliders can cause a sharp increase in mold complexity.
The battery case frame that requires sealing the inner cavity is more commonly used for low-voltage sanding routes. The density of die-casting parts is also difficult to meet high airtightness requirements.
Differences in Materials and Properties
Die casting commonly uses non heat treated aluminum alloys, such as AlSi10MnMg series. Save T6 treatment to avoid quenching deformation of large parts.
Low pressure casting can use heat treatable alloys such as A356 and 6082, which provide a more flexible combination of strength and elongation.
The elongation of large integrated components is usually lower than that of low-pressure components. The material selection for the parts that require collision energy absorption needs to be evaluated separately.
Differences in mold structure
The integrated die-casting mold weighs 100-300 tons and requires a dedicated lifting and mold temperature machine group. The thermal management of molds is the core difficulty, often equipped with 20-40 sets of oil temperature circuits.
Low pressure molds typically weigh between 3-10 tons and have a relatively simple structure. The waterway is mainly water-cooled, with few temperature control points.
Xinfeng Mold's experience in low-pressure structural component molds is more reflected in the design of sand core matching and shrinkage compensation, which is different from the design logic of die-casting molds.
How to divide labor more reasonably
Front end large thin-walled parts, platform based mass production, handed over to integrated die-casting. Rhythm and integration are the main benefits.
Small and medium-sized batches, complex inner cavities, and parts that require heat treatment are handed over to low-pressure casting. Low mold investment and flexible process adjustment.
On the same vehicle model, two processes often coexist. Putting the right parts into the right process is more practical than pursuing a single process.
Frequently Asked Questions
Q: Will integrated die-casting replace low-pressure casting?
Answer: No, the two are applicable in different sizes and batches.
Q: How much does an integrated die-casting mold cost?
Answer: It usually costs 10-30 million yuan, depending on the tonnage and complexity.
Q: What are the suitable sizes for low-pressure casting?
Answer: The weight of a single item is mostly within 50kg, depending on the machine.
Q: Can die-casting parts have complex inner cavities?
Answer: Due to demolding restrictions, the reverse button requires a slider, which limits its complexity.
Q: Which process has better air tightness?
Answer: Low pressure sand core is more suitable for high air tightness internal cavity components.
Q: Which one to choose in small batches?
Answer: Low pressure casting is given priority for annual production of less than 100000 pieces.
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