Improvement of production efficiency: No need for mold making, direct printing of sand patterns, significantly reducing production time.
High design flexibility: It is possible to realize complex structures that are difficult to accomplish with conventional processes.
high precision: Digital manufacturing ensures product consistency and accuracy.
cost-effectiveness: Suitable for small batch production and customization needs with greater economy.
1. Digital model preparation
First, a 3D model of the part is designed using CAD software and optimized as follows:Consider casting process requirements: Add an appropriate shrinkage margin.
Design of casting systems and risers: Ensures smooth flow of metallic fluids.
Perform mold filling and solidification simulation analysis: Predicting the quality and performance of castings.
Optimization of model structure: Ensure print viability.
2. Print device selection
There are two main technologies on the market for 3D printing sand molds:Selective Laser Sintering (SLS): Suitable for precision parts.
Binder Jetting: Suitable for large castings. To be considered when selecting equipment:
Print Size: Select the right equipment for the part size.
Printing Accuracy: Ensure that design requirements are met.
production efficiency: Selected according to production requirements.
Material compatibility: Ensure that the device supports the required print material.
3. Material preparation
Sand printing materials mainly include:Special casting sand: Uniform particle size and good fluidity.
Bonding agent: Ensure sand strength.
catalyzer: Accelerates the curing process. The choice of material directly affects the quality of the casting and needs to be optimized in proportion to the specific application scenario.
4. Print process control
The following key points need to be noted during the printing process:Print room temperature and humidity control: Ensure that the printing environment is stable.
Uniformity of sand spreading: Ensures the densification of the sand mold.
Adjustment of binder dosage: Ensure sand strength.
Curing time control: Avoid over- or under-curing.
5. Post-treatment processes
Printing the finished sand pattern needs to be done:Clearing loose sand: Ensure a smooth surface.
Strength test: Ensure that the sand mold can withstand the casting pressure.
Dimensional Inspection: Ensure compliance with design specifications.
surface treatment: Improve the surface quality of castings.
1. Sand quality control
Compaction test: Ensure that the sand is dense.
Compressive strength test: Ensure that the sand mold can withstand the casting pressure.
Breathability check: To avoid porosity in castings.
Verification of dimensional accuracy: Ensure compliance with design requirements.
2. Casting process control
Pouring temperature monitoring: Ensures metallic liquid flow.
Pouring speed control: Avoid impact of metallic liquids on the sand mold.
Control of cooling conditions: Ensure uniform cooling of the casting.
Timing judgment of demolding: Avoid deformation of castings.
Sand cracking
rationale: Improperly proportioned or inadequately cured binder.
tackle: Adjust ratios to optimize curing parameters.
Dimensional deviations
rationale: Improperly set print parameters or material shrinkage.
tackle: Optimize print parameters to compensate for shrinkage.
Poor surface quality
rationale: Inappropriate sand grain size or uneven sand spreading.
tackle: Selection of suitable grit and improvement of the sand laying process.
Aerospace parts manufacturing: Meets the needs of high precision and complex structures.
Development of prototype parts for the automotive industry: Shorten the R&D cycle.
Production of key components for construction machinery: Increase productivity.
Art casting and other personalization: Realization of complex designs.
Address：No.7 Jin Yi Street, Shunyi District, Beijing, China
Tel: 010-62117806
E-mail: 3dptek@reikibyjudith.com
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