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The heat treatment requirements for machining are actually a technical requirement for the design link. If you are a mechanical structure design engineer, you need to have a cognitive ability in this area, if you don't conscious, then you are not a qualified design Engineers, at least not a very comprehensive design engineer. The cognition of the heat treatment design requirements of the part is basically established in a cognition of the use and processing of materials, so this is a very systemalized knowledge structure, which is not isolated. First we need to understand how many methods have been included in the so-called part of the mechanical machining process? In view of the frequency and importance of various methods in the machining process, we chose the following to analyze, ie, focusing. In the process of machining, we use the most hot treatment methods: annealing, normal fire, quenching and tempering, and doing the following analysis.
Annealing processing: Definition of annealing treatment: Heat metal parts to a certain high temperature, maintaining a metal heat treatment process for naturally cooled. Its main role: A: Reduce the hardness of the part, improve the cutting performance; B: Eliminate the residual stress of the parts, stabilize the size, reduce the probability of deformation and crack; C: refine grain, adjust the tissue, eliminate material tissue defects; d: uniform Materials and ingredients, improve material properties or prepare for subsequent heat treatment processes.
Treatment: Treatment of normal fire treatment: Heat metal parts to a certain high temperature, keeping a period of time, then allowing it to cool in air, spray blowing, etc., which is different from the annealing treatment, which cools The speed is fast, so the material organization has improved, and mechanical properties have also improved. Its main role: A: Remove the internal stress of the material; B: reduce the hardness of the material and improve the plasticity;
Quenching Treatment: Definition of Qualification: Heat metal parts to the critical temperature AC3 or AC1 temperature, holds it for a period of time, so that all or part of the austenita, and then cool to MS below the Cooling speed of the critical cooling speed The heat treatment process of martensite transition. Its main role: A: greatly improve the rigidity, hardness, wear resistance and fatigue strength of the part; B: Meet the physics, corrosion resistance of certain special steels.
Treatment of tempering: Treatment of tempering: means that steel after quench hardening or normalization is then immersed after a period of time than a critical temperature, cool down at a certain speed to increase the toughness of the material. Temperature treatment. Its main role: A: Eliminate the residual stress generated during the quenching of the workpiece, prevent deformation and cracking; B: Adjust the hardness, strength, plasticity and toughness of the workpiece, achieve better performance requirements; C: Stable tissue and size, guarantee accuracy; D: Improve and improve processing performance.
