Deep drawing can be used to create a broad range of parts. You may choose to purchase these parts to use in your industrial applications or you may choose to engage in deep drawing yourself. However, there are several mistakes you must avoid when engaging in deep drawing.
One of the most common concerns when deep drawing is wrinkling. The wrinkling usually occurs in the wall or flange component of the part. The wrinkling on deep parts can be caused by blank holder pressure, friction, clearance issues, punch speed, blank shape or the final part geometry. Also, the die temperature can lead to wrinkling.
Using the Wrong Material
For a material to be effective when deep drawing, it must have the right material quality. The material must have enough tensile strength, elongation, yield strength and n and r values. These values affect how the metal forms. If it has an elongation of 40 percent or higher, an n value of 0.2 or higher and an r value of 1.6 or higher, you will have an easier time drawing the material.
Using the Wrong Die Entry Size
Make sure that the die entry radius is the right size. When the radius is too large, the material will be more likely to wrinkle. If the entry radius is too small, the material will not fit.
Using the Wrong Lubricants
Always use the right lubricant when deep drawing. Otherwise, you might cause more friction and suffer from wrinkling. Lubricants come with additives that reduce the amount of friction if the additives are suitable for the temperature at which you will be deep drawing. For instance, you will need one lubricant when deep drawing steel and another lubricant when deep drawing aluminum.
Having the Wrong Settings
Make sure to use the correct binder pressure setting. When a binder pressure is too low, the material will be more likely to wrinkle. During the process, the material is then forced to unwrinkle and this can cause it to fracture. The material will also wrinkle when the pressure is too high and when the standoff gap is too large.
Stretching the Material Too Far
If you have the wrong limiting draw ratio, your material will be forced to stretch. If the material is not able to stretch very far, such as with steel, the material will be more likely to fail. Know the materials elongation to know how far you can stretch it.
Contact a company, like Precision Stamping, for more help.Share