Stainless Sheet V Grooving Cut Before Bending

Stainless Sheet V Grooving Cut Before Bending

According to the bending process of CNC Press brake, after the workpiece is bent, the bending edges of the decorative surface are in a circular arc shape, and its radius is directly proportional to the thickness of the metal plate. The thicker the plate, the larger the arc radius formed by bending. Especially In elevator car assembly for stainless sheet bending applications, if the bending radius is large, the splicing gap of car wall plate and ceiling bending plate will be large, which will affect the appearance.

So for most thin stainless sheet bending for decoration, mainly for 4mm stainless bending, it's required V cutting grooving first before put it to the cnc press brakes for bending angles, then  stainless sheet profiles can get smaller Radius bending angles.

Setting of groove cutting depth

金属板材的厚度不同，其刨槽深度也有所差异。电梯轿厢刨槽折弯工艺中，刨槽后剩余板材厚度一般为原板材的40% ～ 50%，如，板厚为1.0mm，则刨槽深度为0.5mm，余料厚度为0.5mm;板厚为1.2mm，则刨槽深度为0.7mm，余料厚度为0.5mm;板厚为1.5mm，则刨槽深度为0.9mm，余料厚度为0.6mm;板厚为2.0mm，则刨槽深度为1.2mm，余料厚度为0.8mm。刨槽过浅会使折弯效果不明显，过深则容易影响工件结构强度。

The groove depth varies with the thickness of stainless sheet. In the bending process of elevator grooving, the thickness of the remaining plate after grooving is generally 40% ~ 50% of the original plate. If the plate thickness is 1.0mm, the grooving depth is 0.5mm and the thickness of the remaining material is 0.5mm; If the plate thickness is 1.2mm, the grooving depth is 0.7mm and the residual material thickness is 0.5mm; If the plate thickness is 1.5mm, the grooving depth is 0.9mm and the residual material thickness is 0.6mm; If the plate thickness is 2.0mm, the grooving depth is 1.2mm and the residual material thickness is 0.8mm. If the groove is too shallow, the bending effect will not be obvious, and if it is too deep, it will easily affect the structural strength of the workpiece.

V 槽角度的设置

Setting of V-Grooving angle

金属板材在经过刨槽工艺后，折弯回弹虽然大幅降低，但仍然存在，因此在刨V 形槽时，可根据工件的折弯角度灵活开槽。一般不锈钢薄板V 形槽的开槽角度要比折弯成形角度大1°～ 2°，如一个成形角度为90°的工件，其V 槽开槽角度一般为92°。这样就能很好地避免折弯回弹造成的角度误差了，如图5 所示。

After the grooving process, the bending springback of the metal plate is greatly reduced, but it still exists. Therefore, when planing the V-shaped groove, the groove can be flexibly slotted according to the bending angle of the workpiece. Generally, the V-groove angle of stainless steel sheet is 1 ° ~ 2 ° larger than the bending forming angle. For example, the V-groove angle of a workpiece with a forming angle of 90 ° is generally 92 °. In this way, the angle error caused by bending springback can be avoided.

槽刀的种类与选择

Types and selection of grooving cutters

槽刀的种类主要分为菱形顶角槽刀、正方形槽刀、三角形槽刀、圆形槽刀等，刨槽时可根据V 槽的不同形状和角度来选择合适的刀具。刨普通V 槽时， 刀具角度应该小于V 槽的角度。如，V 槽角度为45°～ 60°时，应选择菱形顶角为35°的槽刀;角度为60°～ 80°时，应选择正三角形槽刀;角度为80°～ 90°时，应选择菱形顶角为80°的槽刀;角度大于90°时，应选择正方形槽刀;开圆槽时则选用圆形槽刀。.

The types of grooving knives are mainly divided into diamond top angle grooving knives, square grooving knives, triangular grooving knives, circular grooving knives, etc. when planing grooves, appropriate knives can be selected according to the different shapes and angles of V grooves. When planing ordinary V-groove, the tool angle should be less than the angle of V-groove. For example, when the V-groove angle is 45 ° ~ 60 °, the groove cutter with diamond top angle of 35 ° shall be selected; When the angle is 60 ° ~ 80 °, the regular triangle slotting cutter shall be selected; When the angle is 80 ° ~ 90 °, the slot cutter with diamond top angle of 80 ° shall be selected; When the angle is greater than 90 °, a square slotting knife shall be selected; When opening a circular groove, select a circular groove knife.