Classification and selection principles of mold materials

Classification and selection principles of mold materials

First, the metal structure: 1, metal: has opaque, good luster of thermal conductivity and electrical conductivity and its electrical conductivity decreases with increasing temperature, and has properties such as ductility and malleability. The internal atoms of the metal have a regular arrangement of solids (ie, crystals). 2. Compound: The chemical composition of the alloy components is combined to form a new crystalline solid structure with metallic properties. 3. Solid solution strengthening: Since the pipe fitting mould manufacturers  solute atoms enter the gap or junction of the solvent lattice, the lattice is distorted, and the hardness and strength of the solid solution are increased. This phenomenon is called solid solution strengthening. 4. Alloy: A substance having two or more metals or metals and non-metals and having metallic properties. Phase: The components of the alloy that have the same composition, structure, and properties. 5. Solid solution: a solid metal crystal in which one (or several) elements of atoms (compounds) are dissolved in the lattice of another component while still maintaining another group of lattice types, solid solution partitioned solid solution and Replace two solid solutions. 6, mechanical mixture: an alloy composition composed of two crystal structures, although it is a two-sided crystal, it is a component with independent mechanical properties. Second, the classification of steel: 1, according to the degree of deoxidation during smelting: the steel is divided into boiling steel (deoxidation is not complete), killed steel (deoxidation is relatively complete) and semi-killed steel. 2, according to the type of smelting furnace: the steel is divided into flat furnace steel (acid flat furnace, alkaline open furnace), air converter steel (acid converter, alkaline converter, oxygen top-blown converter steel) and electric furnace steel. 3, according to the purpose of classification: according to the use of steel can be divided into structural steel, tool steel, special performance steel three categories. 4, structural steel: used as steel for various machine parts, including carburized steel, quenched and tempered steel, spring steel and rolling bearing steel. Steel used as engineering structure, including A, B, special steel and ordinary low alloy steel in carbon steel. 5. Tool steel: Steel used to make various tools. According to the use of tools, it can be divided into cutting tool steel, die steel and measuring steel. Third, the principle of mold selection: 1, meet the working conditions requirements 2, fatigue fracture performance 3, high temperature performance 4, resistance to cold and heat fatigue performance 5, wear resistance 6, toughness 7, annealing process 8, cutting processability 7.1.10 Oxidation, decarburization sensitivity 9, hardenability 10, hardenability 11, quenching deformation cracking tendency 12, grindability 13, corrosion resistance 14, forgeability 15, meeting economic requirements