Common Problems in the Auto Parts Micro Screws Process

During the stretching process, excessive tangential stress around the edges of Auto Parts Micro Screws can cause the material to lose stability, resulting in uneven wrinkles along the edges of the product, known as wrinkling.

Severe wrinkling can also make it difficult for the material to pass through the gap between the die and punch during stretching, increasing the tensile deformation force and even causing cracking.

Wrinkling can be prevented during the auto parts Micro Screws process by using a blank holder without affecting subsequent processing.

Placing a ring of raised ribs around the Auto Parts Micro Screws material to hold it down has the advantage of producing a fuller stretched product and preventing wrinkling.

Cracking is another common problem during the stretching process of Auto Parts Micro Screws. When the tensile stress on the barrel wall exceeds the material's strength limit, the product will crack. Cracks typically appear on the barrel wall slightly above the punch radius. This is related to the material's tensile properties, material diameter and thickness, drawing coefficient, corner radius of the punch and die, blank holder force, and friction coefficient. Therefore, when designing Auto Parts Micro Screws, the corner radius can be increased as much as possible, but not too sharp, if permitted by the customer's product requirements.

During drawing, the use of necessary lubrication facilitates a smooth drawing process and improves wall thinning.

However, it is important to note that lubricant should only be applied to the working surface of the die. Never lubricate the contact surface between the punch and the material. This is because the friction between the punch and the blank surface is favorable, preventing material slippage, cracking, and thinning.