Custom Precision Sheet Metal Fabrication Services In China

The Material Influence Of Blanking

Blanking requires that the sheet should have sufficient plasticity to ensure that the sheet does not crack during blanking. Soft materials (such as pure aluminum, rust-proof aluminum, brass, red copper, low carbon steel, etc.) have good punching properties, and parts with smooth cross-section and small inclination can be obtained after punching; hard materials (such as high carbon Steel, stainless steel, duralumin, super duralumin, etc.) have poor quality after blanking, and the unevenness of the section is large, especially for thick sheets. For brittle materials, tearing is easy to occur after punching, especially when the width is small.

The Material Influence Of CNC Bending Process

Sheets that need to be bent should have sufficient plasticity and a lower yield limit. The sheet with high plasticity is not easy to crack when bending, and the sheet with lower yield limit and lower elastic modulus has small rebound deformation after bending, and it is easy to obtain the bending shape with accurate size. Materials with good plasticity such as low carbon steel, brass and aluminum with carbon content less than 0.2% are easy to bend and form; materials with greater brittleness, such as phosphor bronze (QSn6.5～2.5), spring steel (65Mn), hard aluminum , super hard aluminum, etc., must have a relatively large relative bending radius (r/t) when bending, otherwise cracking is easy to occur during the bending process.

Special attention should be paid to the selection of the hard and soft state of the material, which has a great influence on the bending performance. For many brittle materials, bending will cause cracking of the outer fillet or even bending fracture. There are also some steel plates with high carbon content. If you choose In a hard state, bending will also cause the outer fillet to crack or even break, which should be avoided as much as possible.

The Material Influence Of Drawing Process

Sheet metal drawing, especially deep drawing, is one of the more difficult sheet metal fabrication processes. It not only requires the drawing depth to be as small as possible, the shape as simple as possible, and a smooth transition, but also requires the material to have good plasticity. , it is very easy to cause the overall distortion of the parts, local wrinkling, and even cracks in the stretched parts.

The lower the yield limit and the larger the plate thickness directional coefficient, the smaller the yield ratio σs/σb of the sheet, the better the stamping performance, and the greater the limit degree of primary deformation. When the plate thickness directivity coefficient>1, deformation in the width direction is easier than deformation in the thickness direction. The larger the R value of the stretch fillet, the less likely it will be thinned and broken during the stretching process, and the better the tensile properties will be. Common materials with better tensile properties are: pure aluminum sheet, 08Al, ST16, SPCD.

The Material Influence Of Stiffness

In the design of sheet metal structures, it is often encountered that the rigidity of sheet metal structural parts cannot meet the requirements. Structural designers often use high carbon steel or stainless steel instead of low carbon steel, or use hard aluminum alloys with higher strength and hardness instead of ordinary aluminum alloys , expecting to increase the stiffness of the part, in fact, there is no obvious effect. For the material of the same base material, the strength and hardness of the material can be greatly improved through heat treatment and alloying, but the change in stiffness is small, and the rigidity of the part can be improved. Only by changing the material and changing the shape of the part can a certain effect be achieved. , elastic modulus and shear modulus of different materials