The molten metal (copper at approximately 1100–1200℃, aluminum at approximately 700℃) flows smoothly from the insulation furnace through the channel into the graphite mold cavity;
The high-temperature heat is rapidly conducted through the graphite wall to the outer copper/steel water jacket, which is then removed by the circulating cooling water, forming a stable solidification shell;
The billet completes the surface solidification and semi-solidification of the core part within the mold, and is pulled out uniformly by the traction machine;
The graphite does not adhere to the metal, is self-lubricating, and has low expansion, ensuring that the surface of the billet is smooth, the dimensions are stable, it does not crack, and it is not scratched.
The entire crystallizer = graphite mold (inner lining) + cooling copper sleeve + steel outer jacket + sealing components
Graphite mold: In direct contact with molten metal, it can be in a complete type, segmented type (front section / middle section / rear section), or valve type; the round rod mold has a round hole, the pipe mold has a through hole with a core head, and the special-shaped mold has a customized cross-section;
Cooling copper sleeve: Wraps around the outer circle of the graphite, with water channels inside for circulating water, responsible for efficient heat exchange;
Steel outer jacket: Supports, secures, and prevents deformation;
Advantages of segmented design: The front section is prone to burning out and can be replaced separately, reducing costs and minimizing downtime.
The mainstream material is high-purity isostatic graphite (Isostatic Graphite), while a few low-end options use extruded graphite.
Purity: ≥99.9%, High purity ≥99.95%, Ash content ≤50 ppm. To avoid impurity contamination of the metal and the formation of pores;
Particle size: Fine grain / Ultra-fine grain (≤15 μm), uniform structure, high strength, good thermal shock resistance, and less slagging;
Common grades: Domestic G347, G458; Japanese NC-07E, NC-S71, etc.;
Optional coatings: SiC, BN (boron nitride) anti-oxidation / anti-stick coatings, to extend service life and reduce mold sticking.
Product Classification
By casting material: copper / oxygen-free copper molds, brass molds, aluminum molds, zinc molds, precious metals (gold and silver) molds;
By cross-sectional shape: round bar molds, hollow tube molds, square / flat plate molds, special-shaped profiles molds;
By structure: integral molds, segmented combined molds, multi-flow molds (producing multiple rods simultaneously);
By precision: ordinary grade (profiles / low-end copper rods), precision grade (oxygen-free copper rods, conductive strips).
Core physical performance parameters
Working temperature: up to 2500℃
Purity: ≥99.9% (99.95% for high grade)
Bulk density: 1.75–1.88 g/cm³
Thermal conductivity: 120–180 W/(m·K)
Coefficient of thermal expansion: ≤4.5×10⁻⁶ /℃
Shore hardness: 55–75
Compressive strength: ≥80 MPa
Flexural strength: ≥40 MPa
Porosity: ≤5%
Surface roughness: Ra ≤0.4–0.8 μm
Service life: 30–120 heats (depending on metal & coating)
Core advantage
High temperature resistance and good thermal stability: does not soften or melt at high temperatures, maintains good strength;
Fast heat conduction and uniform heat dissipation: stable cooling, uniform grain structure, reduces shrinkage / porosity / cracks;
Extremely low thermal expansion coefficient and strong thermal shock resistance: less likely to crack during cold and hot cycles, with small deformation and stable dimensions;
Natural self-lubrication, non-stick to metals: low friction, smooth demolding, bright cast billet surface, no scratches, no mold adhesion;
Chemical inertness, no metal contamination: does not react with copper / aluminum / zinc melts, ensuring metal purity, electrical conductivity / thermal conductivity;
Easy for precise processing, customizable: can be processed by turning, milling, drilling, grinding, and can be made into round, square, flat, or irregular shapes;
High cost performance, controllable material cost: compared to metal molds, has longer high-temperature lifespan, lower unit price, and easier replacement.
After years of development, on the basis of the company's high penetration express delivery network covering the country and major countries and regions around the world, we provides customers with integrated supply chain solutions through procurement, production, circulation, sales and after-sales.
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