Die casting mold with microstructure for long distance filling and high performance manufacturing of super large thin-walled castings and forming method thereof

By designing a detachable inner mold with a microstructure and a heat-insulating lubricating silicone oil layer, the problems of insufficient filling and defects in long-distance filling and high-performance manufacturing of ultra-large thin-walled castings were solved, realizing long-distance filling and high-quality forming of alloy liquid.

CN121082862BActive Publication Date: 2026-06-09NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Filing Date
2025-09-08
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing technologies make it difficult to achieve long-distance filling of ultra-large thin-walled castings, resulting in insufficient filling of the alloy liquid in the mold, leading to under-casting defects and deterioration of mechanical properties. Furthermore, traditional solutions reduce the lightweighting effect, exacerbate alloy liquid turbulence, and shorten mold life.

Method used

A detachable inner mold with a microstructure is designed, including micro-guide ribs and micro-nano grooves that suppress turbulence in the alloy liquid. Combined with a heat-insulating and lubricating silicone oil layer, the alloy liquid filling distance is extended and the forming quality is improved through the functions of guiding flow, suppressing turbulence, and heat insulation and lubrication.

Benefits of technology

It significantly increases the alloy liquid filling distance, reduces filling defects, improves the mechanical properties of the casting across the entire area, reduces mold manufacturing costs, overcomes the limitations of traditional methods, and achieves high-performance manufacturing.

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Abstract

The application relates to a microstructure die casting die for long-distance filling and high-performance manufacturing of super-large thin-wall castings and a forming method thereof, the die casting die comprising an outer die and a detachable inner die with a microstructure designed on a die cavity surface; the microstructure is any one of a micro-flow guide rib structure, a micro-nano groove structure for resisting alloy liquid turbulence, and a composite structure combining the micro-flow guide rib structure and the micro-nano groove structure for resisting alloy liquid turbulence, and is used for containing a heat-insulating lubricating silicone oil layer; the die casting forming method comprises the following steps: preparing alloy liquid; installing the die casting die; preheating the detachable inner die; spraying the heat-insulating lubricating silicone oil; pressure filling the alloy liquid; alloy liquid pressure keeping, solidification and cooling; and opening the die to take out the product. The die casting die surface structure design and the heat-insulating lubricating design can solve the industry bottleneck problems of insufficient filling distance of super-large integrated thin-wall die castings, many defects of the far-end castings in the filling process, and poor mechanical properties through flow guiding, alloy liquid thinning, turbulence resisting, and heat-insulating lubricating effects.
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Citation Information

Patent Citations

  • Method for processing cavity surface of casting mold

    CN102159341A

  • Die casting product and die device

    JP1995246450A