Sand castings
Process Introduction
Sand casting is a metal forming process that first forms a three-dimensional sand mold, and then pours the melted metal into the cavity of the sand mold for solidification. After the metal parts have cooled and formed, remove the sand shell. Some sand castings require post-processing after casting. Sand casting can produce various metal materials, including cast iron, special alloy steel, titanium alloys, etc. Sand casting is an economically efficient process technology that can flexibly adapt to size and structural design requirements. Sand castings usually require secondary processing to improve product accuracy.
Main steps
1. Drawing: Based on the customer's casting drawings, use drawing software to design the casting production process diagram.
2. Mold making: In sand casting, the mold is made of wood or other metal materials. The mold size is slightly larger than the finished product, and the difference is called shrinkage allowance. The purpose is to ensure that the molten metal acts on the mold to ensure solidification and shrinkage, and to prevent voids during the casting process.
3. Core making: Place sand particles in the mold to form a casting with an internal surface, and the gap between the core and the mold ultimately becomes the casting.
4. Modeling: The process of manufacturing sand molds. Modeling usually involves the support structure of the mold, pulling out the mold to separate it during the casting process, melting the previously placed core in the mold, and then closing the mold mouth.
5. Smelting and pouring: Heat the metal material to a molten state and then pour it into the mold. Parameters such as pouring temperature and speed have a significant impact on the quality of castings.
6. Sandblasting: Separate castings from molding sand and sand boxes manually or mechanically.
7. Cleaning: Removing sand particles, polishing, and excess metal from castings, welding, and sand removal can improve the surface appearance of castings, and remove burnt sand and scale.
8. Inspection: Check the appearance, size, performance, etc. of the castings to ensure compliance with quality requirements.
9. Heat treatment: Heat treat castings as needed to improve their performance.
Material Science
Ball iron:
EN-GJS-350-22
EN-GJS-400-18
EN-GJS-450-10
EN-GJS-500-7
EN-GJS-500-14
EN-GJS-600-3
EN-GJS-700-2
Gray cast iron:
EN-GJL-200
EN-GJL-250
EN-GJL-300
Types and production capacity of existing production lines
1. Resin sand handmade line: suitable for various types of cast iron products, with strong applicability.
Annual production capacity of 60000T, maximum size of parts 4200 * 4200mm * 1600mm, weight range of parts 1kg-20T
2. Wet mold sand automatic line: sourced from the Savilli double-sided compaction process in Italy, ensuring excellent sand mold quality and high molding efficiency (40 types/hour).
Annual production capacity of 50000 tons, maximum part size of 1850 * 950mm * 700mm, part weight range of 1kg-700KG
3. Resin sand automatic line: suitable for multiple varieties and small batches of cast iron products.
Annual production capacity of 60000T, maximum part size of 1900 * 1500mm * 1200mm, part weight range of 20kg-4T
Production equipment
1. Cold core making machine
Equipment model:
Maximum sand core size:
Maximum weight of sand core:
2. Hot core making machine
Equipment model: 80L/120L
Maximum sand core size:
Maximum weight of sand core:
3. Electric furnace
Equipment model: Yingda, Fuji, USA
1 unit of 15T
8T 1 unit
3T 8 units
4. Polishing robot
Equipment model: ABB IRB 6700
Quantity: 10 units
5. Sandblasting and shot blasting
Equipment model:
Number of units:
Testing equipment
Spectral analyzer
Equipment model:
Number of units:
Microscopic metallographic microscope
Equipment model:
Number of units:
Impact testing equipment
Equipment model:
Number of units:
Stretching testing equipment
Equipment model:
Number of units:
Ultrasonic flaw detector
Equipment model: GE.usm 35X
Quantity: 6 units
3D scanner
Equipment model: CREAFORM
Quantity: 1 unit
Laser tracker
Equipment model: SWISS LEICA
Quantity: 1 unit
