The CNC Lathe Parts Supplier will explain it in detail.
What are the effects of cold deformation on OEM Aluminum Machining CNC?
1. Mechanical properties:
After cold deformation of aluminum, due to insta- and inter-crystalline damage, the crystal lattice is distorted and the second type of residual stress appears, which sharply reduces the plasticity index and may approach a completely brittle state in the limit state On the other hand, due to lattice distortion, increased dislocations, elongated and refined grains, and substructures, etc., the strength index has been greatly improved, that is, work hardening occurs.
OEM Aluminum CNC Machining Parts
2. Structure and anisotropy:
After large cold deformation of aluminum, the material appears anisotropic due to the texture. For example, aluminum alloy sheets are prone to noticeable ear restraints during deep drawing. Processing conditions should be reasonably controlled to take full advantage of the positive aspects of texture and anisotropy, while avoiding or eliminating their negative aspects.
3. Physical and chemical properties:
1) Density. After cold deformation, micro-cracks or micro-cracks, crack voids, and other defects appear in and between the grains, reducing the density of the aluminum material.
2) Resistance. The destruction of the intergranular material directly contacts the grains, the grains are oriented in order, and the intergranular and intragranular fractures have a significant impact on the change in resistance. The former two cause the resistance to decrease with increasing deformation, while the latter is the opposite.
3) Chemical stability. After cold deformation, the internal energy of the material increases, making its chemical properties more unstable and susceptible to corrosion, especially stress corrosion.
The above is an introduction to the effects of cold deformation on the properties of aluminum during processing. After cold deformation of aluminum during processing and production, due to and inter-crystalline damage, the lattice constant causes rugged changes And the emergence of two kinds of internal stress, etc., caused the plastic deformation index value to drop sharply, and in some cases will be close to the brittle fracture; on the other hand, due to the rugged lattice constant, increased dislocations, The grains are lengthened and optimized, and their substructures appear, and then the compressive strength index value is greatly improved, that is, cold hardening occurs.
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