Low Levels Of Friction Sheet Metal Forming

Conversely when the amount of lubrication applied on the sheet is very low the resistance to motion is very high.

Low levels of friction sheet metal forming.

In most metal forming processes friction is undesirable. Lubricated sheet metal forming smf processes experimen tal and theoretical studies have been performed. At the micro scopic level friction is due to adhesion between contacting as perities 1 2 the ploughing effect between asperities 1 2 and the appearance of hydrodynamic friction stresses 3 4. The sheet is plastically deformed to the curved form of the die.

One is the improper handling another one is the elasticity of sheet metal forming materials. Low die angle surface area is large which. Today the simulation of sheet metal forming 5 6 has become essential in the automotive industry for the automotive sheet metal product design die developments die construction and production. It is customary to refer to a material below the thickness of 6 35 mm as a sheet and thicker materials as plate.

This high resistance compels the sheet metal to stretch more than required producing a high amount of thinning and in some cases huge amount of splits as shown in figure 4. Figure 2 14 b illustrates forming of tubular work piece with the help of hydraulic pressure and an axial force. Figure 2 14 a shows the process of stretch forming of sheet. The initial reduction is usually 35 to 45.

The sheet metal forming parts will collide with the surrounding objects in the process of raw material inventory manufacturing and shipping. If the interface friction between the strip and rolls is low the neutral section will advance towards exit side and hence the forward slip will also will be low. The ends of sheet are pulled while a die is pressed against the sheet surface. Mishra in friction stir processing for enhanced low temperature formability 2014 sheet metal forming is quite common for making shaped components from soda cans to automotive car bodies.

In case of rolling the forward slip is an indicator of the friction or effectiveness of lubricant. For the original drawing of the blank 50 reduction is rarely used during industrial manufacturing practice. For example emmens 6 has found that friction in sheet forming is a function of a variable which is very similar to ss although he places a somewhat different interpretation on its significance. Metal flow is retarded forces and power are increased.

There are two reasons behind this defect. The amount of forming of the sheet metal that can be accomplished on the first redraw is less than on the original draw.