Precision mold, all kinds of fittings and various parts materials without the characteristics of metal materials, metal materials through a variety of craft processing present different characteristics, and meet the needs of all kinds of mold manufacturing.What are the technical terms of metal materials?The following Mold parts manufacturer, changsha borun, summarized the technical performance of metal materials, for reference only:。
Casting (castability)
The performance of qualified castings can be obtained by casting metal materials.Casting sex mainly includes fluidity, contraction and segregation.Liquidity refers to the liquid metal mold ability, contractility refers to the casting solidification, the extent of the volume contraction, segregation is refers to the metal in the process of cooling solidification, caused by different crystallization has internal metal chemical composition and non-uniformity of the organization.
- Malleability
When the metal material is pressed, it can change the shape without the performance of the crack.It includes processing of hammer forging, rolling, stretching and extrusion under hot or cold conditions.Malleability is mainly related to the chemical composition of metal materials.
- Cutting machinability (machinability, machinability)
It is easy to be a qualified workpiece after metal material is machined by cutting tool.The surface roughness of the workpiece, the cutting speed allowed and the wear degree of the cutter are measured.It is related to the chemical composition of metal materials, mechanical properties, thermal conductivity and the degree of process hardening.It is generally used to make a rough judgment of the quality of the cutting process using hardness and toughness.Generally speaking, the hardness of metal materials is harder to cut, but it is not high in hardness, but it is also difficult to cut.Reference: what are the cutting factors that affect the steel?
- Weldability (weldability)
The adaptability of metal materials to welding process.It mainly refers to the difficulty of obtaining quality welding joint under certain welding conditions.It includes two aspects of content: one is the combination of performance, namely under the condition of certain welding process, the sensitivity of certain metal forming welding defect, 2 it is to use performance, namely under the condition of certain welding process, requirements of the use of certain metal welded joint of applicability.
- Heat treatment
(1).annealing: means that the metal material is heated to an appropriate temperature, maintains a certain amount of time, and then slowly cools the heat treatment process.Common annealing process: recrystallization annealing, stress annealing, spheroidization annealing, complete annealing.Annealing: the purpose of the main is to reduce the hardness of metal materials, improve the plasticity, processing and machining and pressure, and reduce the residual stress, improve the organization and composition of the homogenization, or for the heat treatment after ready for the organization, etc.
(2).normalizing refers to heat the steel or steel to a Ac3 or Acm (steel) on the critical point of temperature more than 30 ~ 50 ?, keep proper time, in the stillness of the air cooling heat treatment process.The main purpose of the fire is to improve the mechanical properties of low carbon steel, improve the cutting processing, refine grain, eliminate the defects of the tissue, and prepare for the preparation of the post heat treatment.
(3).quenching refers to heat the steel to the Ac3 or Ac1 point temperature (steel) above a certain temperature, keep a certain amount of time, and then in the appropriate cooling speed, get martensite bainite) (or heat treatment process of the organization.The common quenching process is salt bath quenching, martensite quenching, bainite isothermal quenching, surface quenching and local quenching.The purpose of quenching is to obtain the necessary martensite tissue, improve the hardness, strength and wear resistance of the workpiece, and prepare for the heat treatment.
(4).tempering: when the steel is hardened, it is heated to a certain temperature below Ac1 for a certain period of time, then cooled to the heat treatment process at room temperature.Common tempering process: low temperature tempering, medium temperature tempering, high temperature tempering and multiple tempering.The purpose of tempering is to eliminate the stress caused by steel in quenching, which makes the steel parts have high hardness and wear resistance, and has the plasticity and toughness needed.
(5).tempering: a compound heat treatment process that is used to harden steel or steel parts for quenching and tempering.The steel used in the adjustment process is called the tempered steel.It is generally referred to as the medium carbon structure steel and the medium carbon alloy structural steel.
- .chemical heat treatment: refers to the metal or alloy workpiece under a certain temperature in the active medium heat preservation, make one or more of the following elements into its surface, to change its chemical composition, microstructure and properties of heat treatment process.Common chemical heat treatment processes: carburizing, nitrification, carburizing, aluminizing, boron, etc.The purpose of chemical heat treatment is to improve the hardness, wear resistance, corrosion resistance,
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