Furniture caster customization manufacturers introduce the difference between caster deformation

The thermal deformation of the caster refers to the plastic deformation of the metal material above the recrystallization temperature. In the process of metal thermal deformation, due to the high temperature and high mobility of atoms, the hardening caused by deformation is immediately eliminated by recrystallization, so it has the following characteristics: thermal deformation causes shrinkage in the metal, holes or voids in the material are compacted , the coarse (dendritic) grain structure is recrystallized and refined, so that the internal structure of the metal is dense and fine, and the mechanical properties (especially toughness) are significantly improved. Metals always maintain good plasticity during hot deformation, which can subject the workpiece to a large amount of plastic deformation.

Due to the low yield strength of metals at high temperatures, they have low resistance to deformation and are prone to deformation.

The cold deformation of the caster means that the temperature of the metal during plastic deformation is lower than the recrystallization temperature of the metal. The characteristic of cold deformation is that the metal has work hardening after deformation, that is, the strength and hardness of the metal increase, and the plastic toughness decreases.

Moreover, the products made by cold deformation have high dimensional accuracy and good surface quality. For those metal components that cannot or cannot be easily improved by heat treatment methods, especially thin-walled slender parts, it is effective and economical to use the work hardening of metal during the forming process to improve the strength and hardness of the components. For example, all kinds of cold stamping parts, cold-rolled cold-extruded profiles, cold-coiled springs, cold-drawn wires, cold-headed bolts, etc., it can be seen that cold deformation processing is widely used in all walks of life.

Products processed by cold deformation, including some complex parts or parts with higher requirements, also need to be tempered at low temperature to relieve internal stress but maintain work hardening. Due to the work hardening phenomenon in the process of cold deformation, the plasticity of the metal material becomes poor, which brings difficulties to further plastic deformation. Therefore, the cold deformation requires heavy and high-power equipment; the surface of the processed blank is required to be clean, free of scale, and flat. Additionally, work hardening increases the resistance of deformed metals and reduces corrosion resistance.