Sand casting mold material selection

What materials are used for casting molds?

The following materials are used for casting molds:
The number of times a casting mold is used varies depending on the casting output.
Mainly divided into metal molds and non-metal molds
Non-metallic mold materials There are: wood, plastic, etc.
Metal Mold Materials There are: plastic, aluminum alloy, cast iron, steel and so on.

mould

Currently, wood molds are widely used for hand or small batch production, but with increasingly stringent environmental requirements, the use of wood for true casting will become more and more limited. True casting uses Styrofoam board as the material, cut and bonded into shapes, and then poured into a casting.
Compared with wooden molds, this method not only saves wood, but also gives the castings higher dimensional accuracy and better surface roughness.

plastic mould

The application of plastic mold is on the rise, especially the processable plastics to the market and the improvement of the life of plastic mold, making the application of plastic mold more and more widely.

Aluminum mold

Aluminum alloy molds are still widely used due to their light weight and high dimensional accuracy. However, the application has recently declined and some ranges have been replaced by plastic molds (when casting batches are small) or cast iron molds (when casting batches are large).

Cast Iron Mould

Cast iron mold is the first choice for large-scale casting production and is widely used. It has the advantages of high strength, high hardness, good abrasion resistance, good workability, low cost and long service life. In recent years, with the improvement of casting level, more and more ductile iron or low rare earth alloy gray cast iron is made, such as the appearance, template base plate and type plate frame, with higher strength and wear resistance, and creep cast iron has better heat resistance and fatigue, also used for core box material.

Steel Molds

As the service life of carbon steel is not higher than ductile iron or low alloy gray iron, and alloy steel is very expensive, processing costs are also relatively expensive, so the steel is mainly used for casting molds on the standard parts, wear-resistant inserts or liners, rarely used in the manufacture of casting mold body. However, with the improvement of mold processing technology and the casting mold dimensional stability requirements, die steel and chromium molybdenum Tajin steel is also used in the manufacture of casting molds.
In addition, based on years of experience in casting moldsNingbo Hexin It is reported that more and more steel is being used to make tools such as mold base plates and core box frames. Cast iron is the most used material in these casting molds, as manual molding will be gradually eliminated. The use of molding machines, core shooters and shell core machines is an inevitable trend. Using these molding machines, casting molds mainly use cast iron as the raw material.

Why choose casting mold materials:

• 1, the production batch: stamping parts production batch is large, should be selected with high quality, good wear resistance mold steel. Mold of other process structure part and auxiliary structure part of the parts material should also be improved accordingly. When the batch size is small, should be appropriate to relax the requirements of the material properties, in order to reduce costs.
• 2, the performance of stamping materials, mold parts use conditions
• When the stamping material is hard or the deformation resistance is large, the convex and concave molds of the stamping die should be made of materials with good abrasion resistance and high strength. When stainless steel is deepened, aluminum bronze concave die can be used because it has good resistance to adhesion. Guide pillar guide sleeve needs wear resistance and good toughness, so mild steel surface carburizing quenching.
• 3, the hot and cold processing properties of the material and the existing conditions of the plant should be considered material properties.
• 4、Adopt micro-deformation mold steel to reduce processing cost.
• 5, for special requirements of the mold, should be developed and applied with special properties of the mold steel.
• 6, the choice of mold materials should be based on the use of mold parts to determine the conditions in order to meet the main conditions under the premise of selecting low-cost materials to reduce costs.