Types of injection mold steel and its selection, the use of alloy structural steel performance than carbon structural steel, the manufacture of injection mold parts and components of the service life of carbon structural steel long. According to the main alloy element classification, plastic mold alloy structural steel can be divided into chromium steel, chromium-nickel steel, chromium-molybdenum steel, chromium-nickel-molybdenum steel, chromium-molybdenum-aluminum steel, chromium-manganese-titanium steel and so on. Alloy structural steel performance is better than carbon structural steel, but hardenability, heat treatment deformation and other properties of the change is not much, generally not suitable for the production of complex shapes or feet in the larger overall four molds and convex molds, in some of the large and can with the production of local sizes smaller. In addition, the hardness and wear resistance requirements of high activity molding parts or molding inserts or suitable.
3 carbon tool
Steel carbon tool steel strength, then degree and wear resistance are better than structural steel, but its toughness is poor, hardenability is not good, heat treatment deformation. Carbon tool steel, including T7, T7A, T8, T8A, T10, T1OA, etc., they can be in the size of the plastic parts are not large, simple shape, heat treatment deformation does not have much impact, the production of batch starring larger occasions used to make injection mold molding parts. In addition, in complex molds can be used for the production of molding inserts, in addition, often used for the production of guide columns, guide bushings, push rods and reset rods and other injection mold parts.
4 alloy tool
Types of injection mold steel and its selection, steel alloy tool steel in the hot-working die steel and cold-working die steel can not only make metal forming injection molds, but also can make and other plastic molding molds. Many of their performance than carbon structural steel and carbon tool steel, but the price is more expensive, usually mainly used to manufacture complex shape, high precision requirements, the production of large batches of injection molding parts, especially in the molding of thermosetting plastics or reinforced plastics injection molds in more applications.
Cold mold steel is divided into low alloy and high alloy two types, the former including 9Mn2V, 9SiCr, CrWMn., 9 GrWMr, etc., the latter including Cri2MoV, Cr6wv, etc.. Low alloy cold working die steel cutting and processing is relatively easy, hardenability, wear resistance, polished than structural steel, heat treatment deformation is relatively small, Dongguan Jie core injection mold precision molds in the mold steel species in the price is relatively cheap, suitable for the production of a large number of stars in the production of thermoplastic thermoplastics in the manufacture of complex shapes, high precision molding parts. High alloy cold working injection mold steel strength, hardness is very high, wear resistance, oxidation resistance, corrosion resistance and polishing performance is relatively good, heat treatment deformation is also very small, and cutting, grinding and toughness is relatively poor, the price is also more expensive, its scope of application and low alloy cold working mold steel is similar, but the service life is relatively long in the reinforced plastics or thermosetting plastics molding molds in the application of more.
Bearing steel GCr15 can also be used as a cold working die steel applications, its hardenability, hardenability and wear resistance are relatively good, in the injection molds are mainly used for wear resistance requirements of high sliding parts. Hot work die steel including: 3Cr2W8V, 5 5CrMnMo, 5 5CrNiMo, 4Cr5 Mosiv, 4Cr5 MoSiv1, etc., they are characterized by high-temperature mechanical properties and heat resistance, but also impact resistance, can withstand very high operating temperatures and working pressures, especially suitable for the manufacture of a variety of plastic mold molding parts, but expensive.
5 stainless steel
Types of injection mold steel and its selection, Jie core precision can be used to make injection mold parts of stainless steel, including 40Cr13, 95Cr18; 14Cr17N2, etc., they can be in a certain temperature and corrosive conditions for long-term work, its mechanical and physical properties remain unchanged, so the molding is easy to produce volatile corrosive gases in plastic parts, you can use stainless steel to make molding parts or other Some of the plastic melt has contact with the injection mold parts, such as the gate set, runner plate, push rod and pull the material rod and so on. But the price of stainless steel is much more expensive than general steel, and processing performance is also relatively poor.
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