Tuesday, January 12, 2021

KOVAR parts cold working manufacturing process

KOVAR parts are precision processed by CNC numerical control machine tools and used for electronic industry equipment; precision parts processing, swiss machining, CNC precision parts processing.

(1) Eliminate machining stress.

When Kovar undergoes plastic deformation during cold working, about 10% to 15% of the applied energy is converted into internal energy, which is commonly referred to as internal stress, so that the Kovar machining material structure is in an unstable state. Under this condition, it can be maintained for a long time without significant changes.

Once it is heated, a series of changes in structure and properties will occur, and the material structure tends to a stable state. This change in structure and properties, especially changes in the structure of the structure, is reflected on the sealing surface.

The tensile stress on the molybdenum group glass during high temperature sealing may cause the glass to produce small cracks and leak air.

(2) Eliminate work hardening.

In the process of cold working, cnc manufacturing and forming of Kovar parts, due to defects such as grain elongation and grain breakage in the internal material structure, crystal defects and dislocation density increase greatly. The smaller the distance between the dislocation and the dislocation, the greater the interference between each other, and the greater the distortion of the surrounding lattice.

Each dislocation line has a stress field, and the dislocation and dislocation pass through each The interaction of the stress field causes the hardness and elasticity of Kovar to increase, while the plasticity decreases, which is work hardening.

If the work hardening is not eliminated, the stress field of the interaction between dislocations and dislocations will be broken due to crystal recovery or recrystallization during high-temperature sealing, and the balance will be lost. This also affects the sealing of alloy machining and glass. Certain stress effects.

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