Selection of blade clearance for shearing machines

Choosing the appropriate blade clearance during the production and use of a shearing machine has a crucial impact on the machining quality of the workpiece.

To achieve good machining quality, it is necessary to choose a reasonable blade gap based on the cut sheet metal. Generally, the following principles can be followed for selection:

1. Based on low-carbon steel with a tensile strength of 375-460MPa and an elongation of 25%, the gap is selected at 10% of the thickness of the sheared plate.

For medium and high carbon steels with lower elongation, the blade gap value should be larger than that of equivalent low carbon steels, and can be selected between 10% and 15% of the plate thickness.

3. For stainless steel with high elongation and tensile strength, the blade gap should also be determined according to the elongation, and the blade gap should be appropriately reduced, selected between approximately 6% to 6.5% of the thickness of the cut plate.

In short, materials with good shear toughness have slightly smaller blade gaps compared to cutting low-carbon steel; On the contrary, when shearing brittle materials, the gap should be slightly larger. Of course, the above are the initial gap values selected during shearing, which can be adjusted slightly based on experience after shearing, depending on the quality of the shearing section.