3D Printed Multi-Way Valve Casting Mold Design
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Solution Overview
Problem
The traditional sand casting process for large integral hydraulic multi-way valves is inefficient due to high mould costs, long manufacturing times, and low success rates, especially for complex structures, leading to casting defects like broken cores and fins, which limits rapid replacement and batch manufacturing.
Innovation Solution
A method and system using 3D printing to create a multi-layer composite sand mold with strategically arranged ingates, runners, and risers, employing a side-pouring mode to disperse gravity and scouring forces, ensuring no bonding gaps and improved exhaust efficiency, and using zircon powder paint for enhanced strength and quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional sand casting process is used, then manufacturing experience and mature process are available, but manufacturing period is long and mould cost is high
Solution Approach 1:
The patent uses 3D printing to create a digital model and print the sand mold directly from digital data, eliminating the need for physical metal molds. This copying approach allows rapid reproduction of mold designs without the time-consuming traditional mold-making process, reducing mould manufacturing period while maintaining process reliability through digital precision
Solution Approach 2:
The patent replaces the mechanical mold-making system with a 3D printing system. Instead of manually or mechanically creating metal molds and sand molds through multiple steps, the system uses additive manufacturing to directly form the sand mold, significantly reducing manufacturing time while preserving the maturity of sand casting processes
2Reliability
If traditional sand casting process is used, then process is mature, but mould cost is high and model modifications are difficult
Solution Approach 1:
The patent stores the valve body design in digital model data that can be easily modified and reprinted. Changes to the valve design only require updating the digital model and reprinting the sand mold, eliminating the need to remake physical metal molds. This provides ease of manufacture for model modifications while maintaining the maturity of sand casting processes
Solution Approach 2:
The patent enables rapid parameter changes by modifying the digital model data rather than physical molds. Design parameters such as valve geometry, port locations, and internal passages can be changed by editing the digital model, which then automatically updates the sand mold design and manufacturing parameters, making model modifications easy while preserving process maturity
3Productivity
If sand mold 3D printing is used, then manufacturing speed is improved, but sand mold strength is much lower than traditional molds
Solution Approach 1:
The patent uses composite binding agents in the 3D printed sand mold, combining organic binders with inorganic additives to enhance sand mold strength. The binding agent formulation is optimized to provide sufficient strength for rapid casting while maintaining the productivity benefits of 3D printing. This composite approach allows the sand mold to withstand pouring forces despite being additively manufactured
Solution Approach 2:
The patent implements local reinforcement strategies in the sand mold design, adding structural support in critical areas where strength is needed during pouring. The 3D printing process allows varying sand density and binding agent concentration in different regions of the mold, providing localized strength enhancement where required while maintaining overall manufacturing speed
4Adaptability or versatility
If sand mold 3D printing is used for complex structures, then manufacturing flexibility is improved, but casting defects like broken cores and fins occur frequently
Solution Approach 1:
The patent incorporates support structures and reinforcement features directly into the 3D printed sand mold design before pouring. The digital model includes built-in support elements that prevent core breakage and fin formation during the casting process. This preliminary action ensures casting quality by preventing defects before they occur, while maintaining the flexibility to manufacture complex structures
Solution Approach 2:
The patent designs the sand mold with built-in cushioning and stress-distribution features that prevent defect formation during pouring. The 3D printing process creates a mold structure that anticipates and compensates for pouring forces, preventing broken cores and fins by distributing stresses evenly throughout the mold structure before the harmful effects can occur
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 enables rapid, high-quality casting of integral hydraulic valves with reduced defects, supports batch manufacturing, and improves the heat-resistant strength of sand cores, making it suitable for industrial applications and reducing trial production costs.
Implementation Method 1
performing 3D printing according to the sand mold model and the sand core model to obtain the sand mold and sand core of the valve to be cast
Implementation Method 2
using zircon powder paint for enhanced strength and quality
Data Source
AI summary
A method and system of casting an integral multi-way valve based on 3D printing belong to the technical field of valve casting. The casting method and system determine, according to structural parameters of an integral multi-way valve to be cast, a plurality of ingates on a plurality of layers, a plurality of runners connecting the ingates on each layer, and a sprue connecting the plurality of runners, and an integral sand mold is printed by using the 3D printing technology to realize a multi-layer composite casting method and a corresponding casting system.