The main reasons and solutions of the deformation of Hardware Spring Pogopin during thermal processi

　　(1) I believe that everyone often booked a spring. Sometimes there are deformation when the spring is treated with heat treatment. So what is the main reason for this situation? In fact, in the conventional thermal treatment of Dongguan Hardware Spring, the main reason for the change of parts is the thermal stress and phase change stress during thermal treatment and quenching. If the heating speed is too fast, the parts are too large compared to the heating furnace, and the temperature of each part is different, which will cause thermal deformation. During the heat preservation process, residual stress will be released, generating deformation, and parts of parts will cause deformation.

　　(2) During the cooling process, due to the different cooling speeds of the parts of the parts, the thermal stress will be formed to deform the parts. Even if the cooling speed is the same, the surface cooling is always fast, and the center cooling is always slow. Therefore, the first phase variable surface causes plastic deformation of the non -phase change center. If the alloy composition partial analysis or decarburization appears on the surface of the material, the phase variable stress is more uneven, and it is easier to cause parts to deform. In addition, if the thickness of the parts is uneven, the cooling speed will be different.

　　(3) In the forging heat treatment, the parts that reduce deformation are placed in the following ways: first, as much as possible to hang vertically, the other is to place it vertically at the bottom of the furnace, and the third is to support it with two points. Between a quarter, the fourth is that the level is placed on the heat -resistant steel tool. During the cooling process of parts, the type, cooling performance and quenchability of quenching medium are related to deformation. Changes in cooling performance can be adjusted by changing viscosity, temperature, liquid pressure, use of additives, stirring, etc. The higher the viscosity and temperature of quenching oil, the smaller the ellipse deformation. When static, the deformation is smaller.

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