{"id":4314,"date":"2021-05-25T05:19:05","date_gmt":"2021-05-25T05:19:05","guid":{"rendered":"https:\/\/staging2.bending.harsle.com\/?p=4314"},"modified":"2024-02-03T07:16:33","modified_gmt":"2024-02-03T07:16:33","slug":"3-important-facts-about-manual-bending","status":"publish","type":"post","link":"https:\/\/www.scoson.com\/pt\/3-important-facts-about-manual-bending\/","title":{"rendered":"3 fatos importantes que voc\u00ea deve saber sobre dobra manual"},"content":{"rendered":"

<\/span>Tempo estimado de leitura: <\/span>24<\/span> minutos<\/span><\/p>\n\n\n\n

Manual bending refers to the method of manually bending a part of a sheet or profile to a certain angle along a straight line or from a line to the other part. It is one of the most basic operating methods for fan gold forming. Common manual bending parts are shown in the figure. Manual Bending<\/p>\n\n\n\n

\"pe\u00e7as
pe\u00e7as de dobra manual<\/strong><\/figcaption><\/figure>\n\n\n\n

Dobragem manual de pe\u00e7as de chapas pequenas e finas<\/strong><\/h3>\n\n\n\n

Point R profiling, platform, bow clamp, and bench vise, etc. The commonly used equipment is a manual folding machine, which is mainly used to bend simple straight line bending plates. Manual bending is mainly used for thin plates with a thickness of less than 3mm and small dimensions, especially for thin plates with a thickness of 0.6~1.5mm. For the bending of thicker sheets, the processing method of manually bending after local heating of the bending part is often used. Manual Bending<\/p>\n\n\n\n

C\u00e1lculo do comprimento de flex\u00e3o<\/strong><\/h4>\n\n\n\n

When bending a sheet, the unfolded length must be calculated first. The correct unfolded length of the bent piece is the basic guarantee for the accurate bending of the bent piece. Due to the following characteristics when bending and deforming: the inner layer of the sheet material is compressed and the outer layer is elongated, and there is a layer of material between the middle and the inner layer that neither stretches nor shrinks. This layer of material is called neutral Floor. Manual Bending<\/p>\n\n\n\n

Therefore, the length of the bent neutral layer is the unfolded length of the bent part of the blank. In this way, the key to the calculation of the blank length of the entire curved part is if one determines the radius of curvature of the curved neutral layer. During production, the empirical formula is generally used to determine the radius of curvature p of the neutral layer: p=r+xt<\/p>\n\n\n\n

A f\u00f3rmula: r\u2014\u2014O \u00e2ngulo interno de dobra da folha;<\/p>\n\n\n\n

x\u2014\u2014O coeficiente da camada neutra em rela\u00e7\u00e3o ao grau de deforma\u00e7\u00e3o, selecionado de acordo com a Tabela 1-1;<\/p>\n\n\n\n

t\u2014\u2014The thickness of the sheet. Manual Bending<\/p>\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<\/td>1.2<\/td><\/tr>
x<\/td>0.21<\/td>0.22<\/td>0.23<\/td>0.24<\/td>0.25<\/td>0.26<\/td>0.28<\/td>0.3<\/td>0.32<\/td>0.33<\/td><\/tr>
r\/t<\/td>1.3<\/td>1.5<\/td>2<\/td>2.5<\/td>3<\/td>4<\/td>5<\/td>6<\/td>7<\/td>\u22658<\/td><\/tr>
x<\/td>0.34<\/td>0.36<\/td>0.38<\/td>0.39<\/td>0.4<\/td>0.42<\/td>0.44<\/td>0.46<\/td>0.48<\/td>0.5<\/td><\/tr><\/tbody><\/table>
1-1 O valor do coeficiente de camada neutra x<\/strong><\/figcaption><\/figure>\n\n\n\n

After the position of the neutral layer is determined, the sum of the length of the straight line and the arc part can be obtained, which is the length of the unfolded material of bending parts. However, because the bending deformation is affected by many factors, such as material properties, mold structure, bending method, etc., for bending parts with complex shapes, many bending angles, <\/p>\n\n\n\n

and small dimensional tolerances, the above formulas should be used for preliminary calculations to determine the test. After bending the blank, the exact blank length can be determined after the test bending is qualified.<\/p>\n\n\n\n

The values listed in Table 1-1 are also applicable to the calculation of bending and unfolding of bars and tubes. Manual Bending<\/p>\n\n\n\n