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Metal Stamping Semi-dry Friction Is A Mixture Of Boundary Friction And Dry Friction

Metal stamping: is a metal cold processing methods, also known as cold stamping or sheet metal stamping, with the power of stamping equipment, metal sheet in the mold directly under the force forming, stamping parts are widely used in auto parts manufacturing And the manufacture of household appliances.

Classification and Mechanism of Friction in Stamping Extrusion

  Friction during forming can be divided into dry friction, boundary friction and fluid friction according to its nature, as follows:

1. Dry friction

  Dry friction refers to the friction between the metal and the contact surface of the tool when no external medium is present. But in the actual production, this absolutely ideal dry friction is not there. Because the metal stamping process, the surface of the existence of the number of oxide film, or adsorption of some gas and dust and other media. But usually said dry friction refers to the friction state without lubricant.

2. Fluid friction

  When the lubricating layer between the metal and the tool surface is thicker, the friction pair is not in direct contact with each other and is completely separated by a lubricating oil film, and friction occurs between the molecules of the fluid as fluid friction. It is different from the dry friction, the size of the friction and the surface of the contact surface has nothing to do, but with the fluid viscosity, velocity gradient and other factors. So the friction coefficient of the fluid friction is very small. Stamping tension in the contact surface pressure and temperature is high, so that the lubricant is often easy to squeeze out or burned, so the fluid friction only in the condition of the occurrence and role.

3. Border friction

  This is a friction between dry friction and fluid friction, known as boundary friction.

In the actual production, due to poor friction conditions, the ideal fluid lubrication state is difficult to achieve. In addition, in the stamping drawing, whether it is the surface of the tool, or the surface of the blank, can not be "clean" surface, always in the medium surrounded,Metal Stamping there is always a layer of deposited film adsorbed on the surface, this film It may be a natural contaminated film, a metal film formed by oily adsorption, a boundary film formed by physical adsorption, and a chemical reaction film formed by a lubricant. So the ideal dry friction can not exist. In fact, it is often the mixed friction of the above three friction coexistence. It can be semi-dry friction can also be semi-fluid friction. Semi-dry friction is a mixture of boundary friction and dry friction. This friction occurs when there is a small amount of lubricant or other medium between the contact surfaces. Semi-fluid friction is a mixture of fluid friction and boundary friction. When there is a layer of lubricant between the contact surface, in the deformation of individual parts will occur in contact with each other dry friction.

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