{"id":2608,"date":"2021-06-08T05:25:03","date_gmt":"2021-06-08T05:25:03","guid":{"rendered":"https:\/\/pj4iaixa9m.wpdns.site\/?p=2608"},"modified":"2021-08-04T14:15:21","modified_gmt":"2021-08-04T14:15:21","slug":"3-things-you-need-to-know-about-bent-parts-by-punch","status":"publish","type":"post","link":"https:\/\/www.harslepress.com\/it\/3-things-you-need-to-know-about-bent-parts-by-punch\/","title":{"rendered":"3 cose che devi sapere sulla piegatura delle parti tramite punzone"},"content":{"rendered":"

<\/span>Tempo di lettura stimato: <\/span>14<\/span> minuti<\/span><\/p>\n\n\n\n

Calculation of unfolded dimensions of bent parts<\/strong> by punch<\/a><\/h3>\n\n\n\n

Determination of the position of the curved neutral layer<\/strong><\/strong><\/h4>\n\n\n\n

The bent neutral layer refers to a metal layer whose length remains unchanged before and after bending deformation, so the expanded length of the bent neutral layer is the blank size of the bent part. In order to calculate the expanded size of the curved neutral layer, the position of the neutral layer must first be determined. The position of the neutral layer can be determined by its bending radius \u03c1, as shown in Figure 1-1. \u03c1 can be calculated according to the following formula empirically.<\/p>\n\n\n\n

\u03c1=r+xt<\/p>\n\n\n\n

Where \u03c1— the bending radius of the neutral layer, mm;<\/p>\n\n\n\n

r —Inner bending radius, mm;<\/p>\n\n\n\n

l—material thickness, mm;<\/p>\n\n\n\n

x—Displacement coefficient of neutral layer,<\/p>\n\n\n\n

Please see the following table for more information:<\/p>\n\n\n\n

\"Figure
Figure 1-1 The position of the strain neutral layer<\/figcaption><\/figure><\/div>\n\n\n\n
r\/ t<\/td>0.1<\/td>0.2<\/td>0.3<\/td>0.4<\/td>0.5<\/td>0.6<\/td>0.7<\/td>0.8<\/td>1.0<\/td>1.2<\/td><\/tr>
X<\/td>0.21<\/td>0.22<\/td>0.23<\/td>0.23<\/td>0.25<\/td>0.26<\/td>0.28<\/td>0.30<\/td>0.32<\/td>0.33<\/td><\/tr>
r\/ t<\/td>1.3<\/td>1.5<\/td>2.0<\/td>2.5<\/td>3.0<\/td>4.0<\/td>5.0<\/td>6.0<\/td>7.0<\/td>\u22658.0<\/td><\/tr>
X<\/td>0.34<\/td>0.36<\/td>0.38<\/td>0.39<\/td>0.40<\/td>0.42<\/td>0.44<\/td>0.46<\/td>0.48<\/td>0.50<\/td><\/tr><\/tbody><\/table>
Neutral layer displacement coefficient<\/figcaption><\/figure>\n\n\n\n

Calculation of the unfolded length of the bent part blank<\/strong><\/strong><\/h4>\n\n\n\n

After the position of the neutral layer is determined, the length of the blank can be calculated directly by the method described below for the bending parts with a relatively simple shape and low dimensional accuracy. For curved parts with more complex shapes or high precision requirements, after using the following formula to initially calculate the length of the blank, it is necessary to repeatedly try bending and continuously correct it to finally determine the shape and size of the blank.<\/p>\n\n\n\n

The unfolded length of the bending piece with the fillet radius r>0.5t<\/h5>\n\n\n\n

As mentioned above, the unfolded length of this kind of bending piece is calculated based on the principle that the size of the neutral layer of the blank before and after bending remains unchanged. The unfolded length is equal to the sum of the unfolded lengths of all straight sections and the neutral layer of the bent part, as shown in Figure 1- 2 shown. The calculation steps are as follows.<\/p>\n\n\n\n