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4 kinds of slitting blade clearance setting problems

Source:     Time:2020-05-15 Hits:

There are many problems may cause the burr of the slitting products. And the slitting blade clearance setting is one of these problem. If you want to know if your slitting blade is correct, just read the following article. It will tell you the 4 kinds of slitting blade clearance setting problems that we would met in the operation of slitting line.

slitting blade

1. Too little clearance of slitting blade

One of the most common set up mistakes is setting the slitting blade with less than ideal horizontal clearances. Tight horizontal clearances misalign the slitting blade edge with the fracture plane and create a step under the outside face of the knife.The step that is cut off is a sliver and often looks like a piece of wire. These slivers will tend to accumulate around the slitting head or under the shear. When the clearances are set too tight, the slit edge will have a deeper than normal shear zone, a smaller than normal fracture zone, and a jagged non-defined line separating the two zones with a burr on the bottom edge. When the horizontal clearance is set too tight, the slitting blade must also be over-penetrated to make the material fracture. And your slitting blade dull faster, and camber is frequently introduced into the strip.

 

2. Very tight clearance of slitting blade

When slitting thicker materials or harder thin materials and your horizontal clearance is set too tight, you can actually get a double fracture. Consequently, you will have little or no fracture zone. When this occurs, the entire face of a slit coil may appear shiny. You will also have a heavy burr. This condition will frequently lead to chipped or damaged slitting blade. In addition, behind each shear zone there is a fracture. If the edge of the material is worked or welded, there is the possibility that the fracture will propagate further and the part produced can fail.

 

3. Too much clearance of slitting blade

When the horizontal clearance is set too wide, there is again misalignment of the fracture plane and slitting blade edge. Instead of shearing the material, you are literally tearing it in two. When you read the edge of strip with this condition, you will see a very heavy rollover above a very small to non-existent shear zone. The fracture zone will be almost the full thickness of the material, and you will have a very heavy burr. This condition also tends to chip the slitting blade as it puts significant load on the edge of the blades.

 

4. Vertical clearance of slitting blade

When slitting, there is a direct correlation between the horizontal clearance and vertical clearance (depth of penetration) of the slitting blade. As a general rule of thumb, the harder the material, the less cutting that is required before the material fractures. The softer the material, the deeper the cut before the metal breaks.

 

Bangzhou Machinery is the metal cutting equipment manufacturer. We can offer you the slitting blade too. And it is for slitting metal plates, coils etc and is available with ground, lapped or polished side faces. If you are interested about our product,just come and contact with us!



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