Casting production process

Casting production is a complex multi-stage combination process, including the following main processes: production process preparation, according to the part drawings, production batches and delivery deadlines to be produced, develop production process plans and process documents, and draw casting process drawings.

　　Casting production process:

　　 Castings Production is a complex multi-step combination process, including the following main processes;

　　1. Production process preparation, according to the part drawings, production batches and delivery deadlines to be produced, formulate a production process plan and process documents, and draw casting process drawings;

　　2. Production preparation, including the preparation of materials and patterns for melting materials, cores, core boxes, sand boxes and other process equipment;

　　3. Modeling and core making;

　　4. Melting and pouring;

　　5. Main processes such as sand removal, cleaning, and casting inspection.

　　Forming principle

　　 Castings Production is to heat and melt metal to make it fluid, and then pour it into a mold cavity with a certain shape, and fill the cavity under the action of gravity or external force (pressure, centrifugal force, electromagnetic force, etc.). And cool it. A metal forming method that solidifies into castings (or parts).

　　Castings are generally used as blanks and processed into parts. However, there are also many castings that can meet the design accuracy and surface roughness requirements of parts without cutting, and are directly used as parts.

　　Properties and composition of molding sand

　　Performance of molding sand

　　The main performance requirements of molding sand (including core sand) include strength, air permeability, refractoriness, shrinkage, fluidity, compactness and collapsibility.

　　Composition of molding sand

　　Molding sand is composed of raw sand, binder and additives. The raw sand for castings requires less mud content, uniform particles, and round and polygonal sea sand, river sand or mountain sand. Binders for castings include clay (ordinary clay and bentonite), water glass sand, resin, synthetic grease and vegetable oil, etc., which are called clay sand, water glass sand, resin sand, synthetic fat oil sand and vegetable oil sand, respectively. In order to further improve certain properties of the molding (core) sand, it is often necessary to add some additional substances to the molding (core) sand, such as coal powder, sawdust, pulp, etc. Sand structure.

　　Process characteristics

　　Casting is one of the main methods for producing parts blanks, especially for parts blanks made of some brittle metals or alloy materials (such as various cast iron parts, non-ferrous alloy castings, etc.). Compared with other processing methods, the casting process has the following characteristics:

　　1. Castings are not limited by metal materials, size and weight. Casting materials can be various cast iron, cast steel, aluminum alloy, copper alloy, magnesium alloy, titanium alloy, zinc alloy and various special alloy materials; castings can be as small as a few grams to hundreds of tons; The wall thickness of castings can range from about 0.5 mm to 1 meter; the length of castings can range from a few millimeters to more than ten meters.

　　2. Castings can produce blanks with complex shapes, especially suitable for producing blanks with complex cavities, such as various boxes, cylinders, blades, impellers, etc.

　　3. The shape and size of the casting can be very close to the shape and size of the part, saving metal material and cutting time.

　　4. Castings generally have a wide range of raw material sources and low casting costs.

　　5. The casting process is flexible and has high productivity. It can be produced manually or mechanically.

Casting

What are the casting processes?

Construction technology of ductile iron

What are the casting processes?

Construction technology of ductile iron