Question 1

Burr

Accepted Answer

Mainly occurs in the shearing die and blanking die, and the gap between the cutting edges may produce burrs when it is large or small

Question 2

Line offset

Accepted Answer

When forming a part, the part that first contacts the die is extruded and forms a line

Question 3

Concave and convex

Accepted Answer

Foreign matters (scrap iron, rubber, dust) are mixed in the uncoiling line to cause concave and convex.

Question 4

Zigzag

Accepted Answer

The r corner or embossing part of the workpiece is zigzagged and strained due to uneven stress, poor matching of the drawbead or poor control of the press slider.

Question 5

Wrinkles

Accepted Answer

Wrinkles at the edge or r part are caused by poor adjustment of the press slider, low accuracy of the press, improper adjustment of the air cushion pressure, and large punch or r part.

Question 6

Other specific problems

Accepted Answer

In daily production, the punching size is too large or too small (may exceed the specification requirements) and has a large difference from the punch size. In addition to the design size, processing accuracy, blanking clearance and other factors of the forming punch and die, the following aspects should also be considered to solve.

⑴. When the cutting edge is worn, the tensile stress of the material increases, and the tendency of the stamping parts to turn over and twist increases. When the material is turned over, the punching size will become smaller.

⑵. The strong pressure on the material will cause plastic deformation of the material, which will lead to larger punching size. When reducing the strong pressure, the punching size will become smaller.

⑶. The shape of the end of the punch edge. If an inclined plane or arc is trimmed at the end, the blanking part is not easy to turn over and twist due to the slowing down of blanking force, so the punching size will become larger. When the punch end is flat (no inclined plane or arc), the punching size will be relatively small.

FAQ