Sheet steel forming process

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Blanking

Blanking is a stamping process that uses a die to separate materials. Blanking, in a broad sense, is the general name of the separation process, which includes cutting, blanking, punching, trimming, cutting and other processes. However, in general, the blanking process mainly refers to blanking and flushing out finished parts, and can also prepare blanks for other forming processes.

After blanking, the sheet material is divided into two parts, that is, the blanking part and the L part. If the purpose of blanking is to make a certain shape of the recoil part, then this blanking process is called blanking; If it is to make an inner hole, it is called punching.

According to the different deformation mechanism, blanking can be divided into ordinary blanking and precision blanking.

Bend

Plastic bending is one of the most common forming methods in press forming process. The effect of bending is represented by the change of curvature radius R and Angle x in the bending deformation zone

Plastic bending must first pass through the stage of elastic bending. In the "Mechanics of Materials" we already know that when the beam is flexed, the outer fibers are strained and the inner fibers are compressed. The tension and compression zones are bounded by the neutral layer, which passes through the center of gravity of the profile and has zero stress-strain.

Therefore, the degree of deformation and stress of the material completely depend on the ratio y/ρ of the distance from the fiber to the neutral layer and the radius of the neutral layer, and have nothing to do with the size of the bending Angle α. The stress and strain are greatest in the inner and outer edges of the bending deformation zone.

Stretch

Drawing forming is a processing method of drawing a plate flange into a concave die hole to form a straight wall.

The inflow of flange, with the different deformation state of the profile shape of the die hole, can be divided into three categories: (a) compressed flange inflow, (b) parallel flange inflow, (c) extended flange inflow.

Due to the different shapes and sizes of drawing parts, the stress-strain distribution of blank in the deformation process is also different. Therefore, when determining the process plan, process parameters and mold design, analysis and calculation should be carried out according to the specific situation to determine a reasonable blank size and the geometric parameters of each step, mold structure parameters and equipment models in order to obtain qualified parts.

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