{"id":13465,"date":"2021-07-27T02:54:21","date_gmt":"2021-07-27T02:54:21","guid":{"rendered":"https:\/\/zawiiw746w.wpdns.site\/?p=13465"},"modified":"2024-02-03T07:13:37","modified_gmt":"2024-02-03T07:13:37","slug":"10-important-points-about-metal-sheet-bending","status":"publish","type":"post","link":"https:\/\/www.scoson.com\/pt\/10-important-points-about-metal-sheet-bending\/","title":{"rendered":"10 Important Points You Should Know About Metal Sheet Bending"},"content":{"rendered":"

Metal Sheet Bending is a stamping process that uses pressure to force the material to produce plastic deformation, thereby forming a shape with a certain angle and curvature. Commonly used bending includes V-shaped bending, Z-shaped bending, and anti-bending pressure equalization.<\/p>\n\n\n\n

Altura de dobra<\/h3>\n\n\n\n

A altura de dobra \u00e9 pelo menos 2 vezes a espessura da chapa mais o raio de dobra, ou seja, H\u22652t+R, conforme mostrado na figura. Se a altura de dobra for muito baixa, a chapa met\u00e1lica \u00e9 facilmente deformada e torcida ao dobrar, e n\u00e3o \u00e9 f\u00e1cil obter a forma ideal da pe\u00e7a e a precis\u00e3o dimensional ideal.<\/p>\n\n\n\n

\"Dobragem
Dobrar R<\/figcaption><\/figure>\n\n\n\n

When the bend is a hypotenuse, it is most prone to bend distortion due to too small a bending height. As shown in the figure, in the original design, because the leftmost bending height is too small, it is easy to be twisted and deformed during bending, resulting in low bending quality. In the improved design, the left bending height can be increased or remove the part with a smaller bending height. Metal Sheet Bending<\/p>\n\n\n\n

\"Deforma\u00e7\u00e3o
Deforma\u00e7\u00e3o de flex\u00e3o<\/figcaption><\/figure>\n\n\n\n

Metal Sheet Bending Radius<\/h3>\n\n\n\n

In order to ensure the bending strength, the bending radius of the sheet metal should be greater than the minimum bending radius of the material. The minimum bending radius R of various commonly used sheet metal materials is shown in the table, where t is the thickness of the sheet metal. Metal Sheet Bending<\/p>\n\n\n\n

Material<\/td>Suave<\/td>Duro<\/td><\/tr>
Liga de alum\u00ednio<\/td>0<\/td>6t<\/td><\/tr>
Bronze de ber\u00edlio<\/td>0<\/td>4t<\/td><\/tr>
Lat\u00e3o<\/td>0<\/td>2t<\/td><\/tr>
Liga de magn\u00e9sio<\/td>5t<\/td>13t<\/td><\/tr>
A\u00e7o inoxid\u00e1vel<\/td>0,5t<\/td>6t<\/td><\/tr>
A\u00e7o de baixo carbono
A\u00e7o de liga leve<\/td>		0,5t<\/td>4t<\/td><\/tr>
Tit\u00e2nio<\/td>0,7t<\/td>3t<\/td><\/tr>
Liga de tit\u00e2nio<\/td>2,6t<\/td>4t<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Of course, the bending radius of sheet metal is not as big as possible. The larger the bending radius, the greater the bending rebound, and the harder it is to control the bending angle and bending height. Therefore, the sheet metal bending radius needs to be reasonably valued. Metal Sheet Bending<\/p>\n\n\n\n

Os fabricantes de moldes de chapas met\u00e1licas tendem a ter um raio de dobra de 0 para que o raio n\u00e3o seja f\u00e1cil de recuperar ap\u00f3s a dobra, e o tamanho da altura de dobra e o \u00e2ngulo de dobra s\u00e3o mais f\u00e1ceis de controlar. <\/p>\n\n\n\n

However, bending with a bending radius of zero can easily cause external cracking or even breaking of the sheet metal bending. At the same time, the sheet metal bending strength is relatively low, especially for harder sheet metal materials, and the mold on the mold after a period of production Metal Sheet Bending<\/p>\n\n\n\n

The right angle will gradually become smoother, and the bending size will become difficult to control.<\/p>\n\n\n\n

In order to reduce the bending force and ensure the bending size, another method adopted by the sheet metal mold manufacturer is to increase the crimping process before the bending process. Of course, such a design will cause the sheet metal bending strength to be relatively low and easy to break and other defects. Metal Sheet Bending<\/p>\n\n\n\n

Dire\u00e7\u00e3o de dobra<\/h3>\n\n\n\n

When the sheet metal is bent, it should be as perpendicular to the fiber direction of the metal material as possible. When the sheet metal is bent parallel to the fiber direction of the metal material, cracks are easily generated at the sheet metal bending, and the bending strength is low, and cracks are prone to occur. Metal Sheet Bending<\/p>\n\n\n\n

Evite a falha de dobra devido \u00e0 incapacidade de pressionar o material na raiz<\/h3>\n\n\n\n

When the sheet metal is bent, it is often because other features are too close to the sheet metal part, which results in the inability to press the material and cannot be bent or the bending is severely deformed. Generally speaking, at least 2 times the thickness of the sheet metal must be guaranteed above the root of the sheet metal bending. In addition to the distance of the bending radius, there are no other features that block the pressing of the sheet metal during bending. Metal Sheet Bending<\/p>\n\n\n\n

In the original design, as shown in the figure below, the reflexed flattening position is too close to the root of the sheet metal bending, causing the sheet metal to be bent and the material cannot be pressed and the bending fails; in the original design, as shown in the lower part of the figure, the sheet metal is pulled too close Bending the roots makes the bending impossible. Metal Sheet Bending<\/p>\n\n\n\n

At this time, you can move the extraction to a position far away from the sheet metal root. If the extraction and bending positions cannot be moved due to design requirements, you can bend the root corresponding to the extraction Add a process cut to ensure smooth bend. Metal Sheet Bending<\/p>\n\n\n\n

\"Dobrar
Pe\u00e7as Dobradas<\/figcaption><\/figure>\n\n\n\n

Garanta a folga de flex\u00e3o e evite a interfer\u00eancia de flex\u00e3o<\/h3>\n\n\n\n

Due to the existence of sheet metal bending tolerances, it is necessary to ensure a certain bending gap in the direction of motion of sheet metal bending to avoid interference during bending and cause bending failure. See below. Metal Sheet Bending<\/p>\n\n\n\n

\"Interfer\u00eancia
Interfer\u00eancia de dobra<\/figcaption><\/figure>\n\n\n\n

As shown in the above figure, the bending sequence of the parts is that the upper side is bent first, and the right side is bent second. In the original design, there is no gap between the two bends. When the upper side is bent, the right side is bent again, Metal Sheet Bending<\/p>\n\n\n\n

Due to the existence of sheet metal bending tolerances, it is likely that the right side will interfere with the upper side during the bending process. In the improved design, at least a 0.2mm gap between the right side and the upper side can be effectively avoided.<\/p>\n\n\n\n

Garanta a resist\u00eancia \u00e0 flex\u00e3o<\/h3>\n\n\n\n

A flex\u00e3o de chapas met\u00e1licas precisa garantir a resist\u00eancia \u00e0 flex\u00e3o. A resist\u00eancia \u00e0 flex\u00e3o longa e estreita \u00e9 baixa e a resist\u00eancia \u00e0 flex\u00e3o curta e larga \u00e9 alta. Portanto, a dobra da chapa met\u00e1lica deve ser fixada o m\u00e1ximo poss\u00edvel no lado mais comprido, conforme mostra a figura, mesma fun\u00e7\u00e3o. Para flex\u00e3o, no projeto original, a resist\u00eancia \u00e0 flex\u00e3o \u00e9 baixa porque a flex\u00e3o \u00e9 anexada ao lado mais curto, e o projeto aprimorado \u00e9 a flex\u00e3o anexada ao lado mais longo e a resist\u00eancia \u00e0 flex\u00e3o \u00e9 alta.<\/p>\n\n\n\n

\"Press\u00e3o
Press\u00e3o de dobra<\/figcaption><\/figure>\n\n\n\n

Reduzir o processo de dobra de chapas met\u00e1licas<\/h3>\n\n\n\n

Quanto mais processos de dobra de chapas met\u00e1licas, maior o custo do molde e menor a precis\u00e3o da dobra. Portanto, o projeto da chapa met\u00e1lica deve minimizar o processo de dobra. Conforme mostrado na figura, a chapa met\u00e1lica no projeto original requer dois processos de dobra. No projeto aprimorado, a chapa met\u00e1lica precisa apenas de um processo de dobra para concluir duas dobras ao mesmo tempo.<\/p>\n\n\n\n

    \n
  1. Short side first, long side first: Generally speaking, when all four sides are bent, folding the short side first and then the long side is beneficial to the processing of the workpiece and the assembly of the bending mold. Metal Sheet Bending<\/li>\n\n\n\n
  2. Perif\u00e9rico primeiro, depois no meio: Em circunst\u00e2ncias normais, geralmente \u00e9 dobrado da periferia da pe\u00e7a de trabalho para o centro da pe\u00e7a de trabalho.<\/li>\n\n\n\n
  3. Parcial primeiro e depois inteiro: Se houver estruturas dentro ou fora da pe\u00e7a de trabalho que sejam diferentes de outras estruturas de dobra, geralmente essas estruturas s\u00e3o dobradas primeiro e depois outras pe\u00e7as s\u00e3o dobradas.<\/li>\n\n\n\n
  4. Consider the interference situation and arrange the bending sequence reasonably: the bending sequence is not static, and the processing sequence should be adjusted appropriately according to the bending shape or obstacles on the workpiece. Metal Sheet Bending<\/li>\n<\/ol>\n\n\n\n

    Evite curvas complicadas<\/h3>\n\n\n\n

    Similarly, the more complex the sheet metal bending process,<\/a> the higher the mold cost, the lower the bending accuracy, and the complex mold bending may cause a waste of parts and materials. Therefore, when the sheet metal part has a complex structure, it can be considered to split the complex bending part into multiple parts, which will help the cost and improve the product quality. Metal Sheet Bending<\/p>\n\n\n\n

    \"Controlador
    Controlador DA66T<\/figcaption><\/figure>\n\n\n\n

    Como evitar o desvio do \u00e2ngulo e tamanho de dobra da chapa met\u00e1lica<\/h3>\n\n\n\n
      \n
    1. Os moldes esquerdo e direito n\u00e3o est\u00e3o alinhados entre si, o que causar\u00e1 desvios nas dimens\u00f5es de dobra. Antes de dobrar, deve-se realizar o ajuste de centraliza\u00e7\u00e3o das l\u00e2minas CNC dos moldes esquerdo e direito.<\/li>\n\n\n\n
    2. Depois que as partes superior e inferior do batente traseiro forem movidas, a posi\u00e7\u00e3o relativa da placa e da matriz superior provavelmente mudar\u00e1, o que danificar\u00e1 o tamanho da dobra. A dist\u00e2ncia entre as pe\u00e7as do batente traseiro deve ser medida novamente antes de dobrar.<\/li>\n\n\n\n
    3. A planicidade insuficiente da pe\u00e7a de trabalho do produto e da matriz superior causar\u00e1 a resili\u00eancia \u00e0 flex\u00e3o e colocar\u00e1 em risco o \u00e2ngulo de flex\u00e3o. A planicidade deve ser medida e ajustada com precis\u00e3o antes de dobrar.<\/li>\n\n\n\n
    4. Quando o \u00e2ngulo de flex\u00e3o prim\u00e1ria n\u00e3o for suficiente, a flex\u00e3o secund\u00e1ria tamb\u00e9m sofrer\u00e1 danos. O ac\u00famulo de desvio de flex\u00e3o aumentar\u00e1 o tamanho da forma\u00e7\u00e3o e o desvio do \u00e2ngulo da pe\u00e7a de trabalho do produto. Portanto, \u00e9 muito importante garantir a precis\u00e3o da dobra unilateral.<\/li>\n\n\n\n
    5. Ao dobrar, o tamanho da porta V da matriz superior \u00e9 inversamente proporcional \u00e0 press\u00e3o de trabalho de dobra. Ao produzir e processar diferentes materiais de chapas met\u00e1licas finas e grossas, voc\u00ea deve selecionar uma ranhura em V de acordo com os regulamentos, geralmente escolhendo a espessura de 6 a 8 vezes mais adequada.<\/li>\n\n\n\n
    6. Ao dobrar a pe\u00e7a de trabalho do produto ap\u00f3s a ranhura, para evitar melhor a fixa\u00e7\u00e3o da faca, o \u00e2ngulo da matriz inferior \u00e9 controlado em 84.<\/li>\n<\/ol>\n\n\n\n
      \"Pe\u00e7a
      Pe\u00e7a de Dobra<\/figcaption><\/figure>\n\n\n\n

      Como evitar chapas met\u00e1licas Recuo de dobra<\/a><\/h3>\n\n\n\n
        \n
      • Causas de recuo<\/li>\n<\/ul>\n\n\n\n

        A maioria das m\u00e1quinas de dobra usa moldes em forma de V, a imagem da esquerda \u00e9 antes da dobra, a imagem da direita est\u00e1 na dobra.<\/p>\n\n\n\n

        \"Efeito
        Efeito de flex\u00e3o<\/figcaption><\/figure>\n\n\n\n

        Os pontos A e B s\u00e3o os pontos de tens\u00e3o da chapa, e os vincos geralmente aparecem nos pontos A e B. Ao dobrar, a matriz superior cai e a chapa desliza ao longo de dois pontos A e B. L \u00e9 a faixa de deslizamento, que tamb\u00e9m \u00e9 o local onde a indenta\u00e7\u00e3o \u00e9 mais prov\u00e1vel de ocorrer. Se o fabricante adotar um m\u00e9todo de revestimento para evitar a indenta\u00e7\u00e3o, a pel\u00edcula protetora \u00e9 f\u00e1cil de romper \u00e0 medida que a press\u00e3o de flex\u00e3o muda. Uma vez que a pel\u00edcula protetora \u00e9 quebrada, o recuo ocorrer\u00e1.<\/p>\n\n\n\n

          \n
        • Solu\u00e7\u00e3o<\/li>\n<\/ul>\n\n\n\n

          Molde de rolo tipo V<\/p>\n\n\n\n

          O principal princ\u00edpio de funcionamento deste tipo de molde \u00e9 que o molde superior cai, o eixo girat\u00f3rio gira e a placa flip \u00e9 virada. \u00c9 preciso por causa da placa girat\u00f3ria que a pe\u00e7a de trabalho est\u00e1 em contato total com o molde inferior sem nenhuma faixa de deslizamento, o que evita o entalhe.<\/p>\n\n\n\n

          \"Molde
          Molde de dobra<\/figcaption><\/figure>\n\n\n\n

          Molde em V de tira de borracha substitu\u00edvel<\/p>\n\n\n\n

          O princ\u00edpio do molde \u00e9 abrir um v\u00e3o em ambos os lados do molde comum em forma de V e inserir uma tira de borracha nesse v\u00e3o. Durante o processo de dobra, a folha est\u00e1 em contato com a tira de borracha. A dureza da tira de borracha \u00e9 muito menor do que a do molde inferior comum, de modo a evitar a indenta\u00e7\u00e3o.<\/p>\n\n\n\n

          \"Borracha
          Dobrar Borracha<\/figcaption><\/figure>\n\n\n\n

          <\/span>Tempo estimado de leitura: <\/span>10<\/span> minutos<\/span><\/p>\n\n\n\n

          <\/p>","protected":false},"excerpt":{"rendered":"

          Metal Sheet Bending is a stamping process that uses pressure to force the material to produce plastic deformation, thereby forming<\/p>","protected":false},"author":1,"featured_media":13487,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[1],"tags":[1104,1488,907],"class_list":["post-13465","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-press-brake","tag-bending-indentation","tag-bending-interference","tag-sheet-metal-bending"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/www.scoson.com\/wp-content\/uploads\/2021\/07\/sheet-bendig-1.jpg","_links":{"self":[{"href":"https:\/\/www.scoson.com\/pt\/wp-json\/wp\/v2\/posts\/13465","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.scoson.com\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.scoson.com\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.scoson.com\/pt\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.scoson.com\/pt\/wp-json\/wp\/v2\/comments?post=13465"}],"version-history":[{"count":0,"href":"https:\/\/www.scoson.com\/pt\/wp-json\/wp\/v2\/posts\/13465\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.scoson.com\/pt\/wp-json\/wp\/v2\/media\/13487"}],"wp:attachment":[{"href":"https:\/\/www.scoson.com\/pt\/wp-json\/wp\/v2\/media?parent=13465"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.scoson.com\/pt\/wp-json\/wp\/v2\/categories?post=13465"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.scoson.com\/pt\/wp-json\/wp\/v2\/tags?post=13465"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}