{"id":26565,"date":"2025-11-29T11:57:35","date_gmt":"2025-11-29T03:57:35","guid":{"rendered":"https:\/\/sinoextrud.com\/?p=26565"},"modified":"2025-11-29T11:57:35","modified_gmt":"2025-11-29T03:57:35","slug":"what-various-shapes-can-be-made-with-aluminum-extrusion","status":"publish","type":"post","link":"https:\/\/sinoextrud.com\/fr\/what-various-shapes-can-be-made-with-aluminum-extrusion\/","title":{"rendered":"what various shapes can be made with aluminum extrusion?"},"content":{"rendered":"

\"Extrusion
Extrusion d'aluminium Profil\u00e9s de volets roulants en aluminium<\/figcaption><\/figure>\n<\/p>\n

A common problem in metal building is finding a shape that is strong, light, and fits exact design needs. Many designs fail because the shape is wrong. Extruded aluminum solves that by letting designers pick almost any shape they need.<\/p>\n

Aluminum extrusion can produce simple or very complex shapes, from solid bars to hollow tubes, multi\u2011void profiles, thin\u2011wall sections and custom curves, offering great strength and design flexibility.<\/strong><\/p>\n

In the rest of this article, I will show how extrusion dies create complex shapes. I will explain why hollow or multi\u2011void shapes help reduce weight but keep strength. I also will discuss how thin walls can still hold up. Let\u2019s dive in to learn what shapes extrusion can give.<\/p>\n

How dies create complex shapes?<\/h2>\n

Ever wonder how one block of aluminum can turn into a weird shape with cavities and fins? The die makes that happen. The die is the tool that shapes the metal as it pushes it out under heat and pressure.<\/p>\n

A properly designed die shapes molten aluminum into complex profiles, with outer contours and inner voids, by forcing the metal through shaped openings under pressure.<\/strong> <\/p>\n

\"Extrusion
Extrusion d'aluminium Cloison de bureau minimaliste Profil\u00e9s d'aluminium<\/figcaption><\/figure>\n<\/p>\n

What is a die in extrusion<\/h3>\n

A die is like a mold. It has an opening with the profile shape. The aluminum billet heats up. Then a ram pushes it through the die. The hot, softened aluminum flows to fill the die cavity. The shape of the die opening determines the final shape. <\/p>\n

Designers draw or model the cross\u2011section shape. The die maker uses that drawing to cut a die plate that matches the shape. For simple shapes \u2014 like a flat bar or square \u2014 the die is simple. For shapes with holes inside or thin fins, the die has solid parts inside that create the cavities. <\/p>\n

How metal flows and fills complex profiles<\/h3>\n

When pressure pushes the aluminum, it flows like soft clay, but at high pressure. The flow tends to follow the path of least resistance. So the die must guide the flow to reach all corners. If a shape has narrow inner channels or long thin fins, the die must be designed carefully. <\/p>\n

The die may have internal supports or mandrels. A mandrel is a solid rod inside the die that forms a hollow space in the profile. As aluminum flows around the mandrel, it forms a hollow or cavity. The die also must allow for ejection \u2014 the piece must slide out smoothly. <\/p>\n

If the die has multiple parts, it might include a \u201cspider\u201d support \u2014 a set of thin legs inside that support the mandrel. The aluminum flows around the spider legs, then exits in the final shape with an inner hollow or void. <\/p>\n

Limits and good design practices<\/h3>\n

Die design must avoid sharp corners and very narrow deep holes. Very thin fins or narrow internal gaps can block flow or cause defects. If the die shape is too complex, the metal may cool too fast before reaching all corners. To counter this, die makers preheat the die or slow the extrusion speed. <\/p>\n

Each shape must consider metal flow, cooling rate, friction inside the die, and die wear. A well\u2011designed die balances shape complexity and manufacturability. <\/p>\n

Summary of die\u2011shaping process<\/h3>\n\n\n\n\n\n\n\n\n
\u00c9tape<\/th>\nDescription<\/th>\n<\/tr>\n<\/thead>\n
1<\/td>\nHeat aluminum billet to extrusion temperature.<\/td>\n<\/tr>\n
2<\/td>\nPush billet through the die under high pressure.<\/td>\n<\/tr>\n
3<\/td>\nAluminum flows into all openings, including outer and internal voids.<\/td>\n<\/tr>\n
4<\/td>\nExtruded shape emerges, cools, and is cut to length.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Because the die determines the cross\u2011section, one die can make thousands of identical pieces quickly. This makes extrusion efficient for long parts like frames, rails, or profiles for windows, solar frames, lighting housings, and more. <\/p>\n

<\/svg> A die shapes both the outer and inner contours of the aluminum profile during extrusion.<\/b>Vrai<\/span><\/p>

The die opening, including mandrel or internal supports, defines the cross\u2011section profile including hollows or voids.<\/p><\/div>
\n

<\/svg> Extrusion dies can only produce solid bars, not hollow or complex shapes.<\/b>Faux<\/span><\/p>

Dies can include mandrels and internal supports to create hollow profiles or multi\u2011void shapes.<\/p><\/div><\/p>\n

Why hollow forms reduce weight?<\/h2>\n

Many aluminum profiles are hollow or have internal voids. This design choice often puzzles people: \u201cIs empty space really strong?\u201d Yes. Hollow shapes reduce weight while maintaining strength when designed well.<\/p>\n

Hollow or boxed profiles reduce weight because they remove unnecessary material from low\u2011stress zones while keeping material where strength matters, which makes parts lighter yet still stiff.<\/strong><\/p>\n

\"Grandes
Grandes extrusions d'aluminium sur mesure<\/figcaption><\/figure>\n<\/p>\n

How hollow shapes keep strength<\/h3>\n

Strength in a bar often comes from material far from the center. In a round tube or square hollow profile, the outer walls resist bending or twisting. The material inside contributes little. So by removing inner material, but keeping outer shell, you keep much of the strength while cutting weight. <\/p>\n

Also, hollow shapes resist torsion and bending well. A hollow tube resists twisting almost as well as a solid rod of the same outer size. The stiffness under bending depends on outer diameter more than inner material. <\/p>\n

When weight matters<\/h3>\n

In many fields, weight is a big concern. In vehicles, lighter frames improve efficiency. In window or door frames, lighter sections make handling easier. In solar\u2011panel frames, heavy metal leads to higher shipping cost and more stress on supports. <\/p>\n

Using hollow aluminum sections reduces material use. That lowers cost. Lower cost plus lighter weight makes the products more competitive. <\/p>\n

Trade\u2011offs and design care<\/h3>\n

Hollow shapes can deform if load is high and the walls are thin. The thickness and shape must match the load requirements. Designers must check stress, load distribution, and potential buckling. <\/p>\n

Thin outer walls may dent if surface is hit. For heavy loads or impact, sometimes solid or reinforced sections are better. <\/p>\n

Comparison: Solid vs Hollow Aluminum<\/h3>\n\n\n\n\n\n\n\n\n\n\n
Crit\u00e8res<\/th>\nBarre solide<\/th>\nHollow Profile<\/th>\n<\/tr>\n<\/thead>\n
Poids par m\u00e8tre<\/td>\nHaut<\/td>\nPlus bas<\/td>\n<\/tr>\n
Utilisation des mat\u00e9riaux<\/td>\nMore<\/td>\nLess<\/td>\n<\/tr>\n
Co\u00fbt par m\u00e8tre<\/td>\nPlus \u00e9lev\u00e9<\/td>\nPlus bas<\/td>\n<\/tr>\n
Rapport r\u00e9sistance\/poids<\/td>\nPlus bas<\/td>\nPlus \u00e9lev\u00e9<\/td>\n<\/tr>\n
Resistance to bending (outer load)<\/td>\nBon<\/td>\nBon<\/td>\n<\/tr>\n
Resistance to impact \/ dents<\/td>\nTr\u00e8s bon<\/td>\nLower (unless thick walls)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Hollow shapes offer a better strength-to-weight ratio for many uses. Designers choose hollow profiles when shipping cost, weight, or material use matters. <\/p>\n

<\/svg> Hollow aluminum profiles maintain bending and torsional strength similar to solid bars when outer geometry stays the same.<\/b>Vrai<\/span><\/p>

Torsional and bending strength depend largely on outer geometry, so hollow shapes can perform close to solid shapes with less weight.<\/p><\/div>
\n

<\/svg> Hollow profiles always give better impact resistance than solid bars.<\/b>Faux<\/span><\/p>

Hollow profiles can dent or deform more easily than solid bars, especially under direct impact or if wall thickness is low.<\/p><\/div><\/p>\n

Where multi-void shapes are used?<\/h2>\n

Sometimes designers need more than one hollow space. Multi-void or multi\u2011chamber profiles have two or more cavities. They allow even more flexibility. Many real\u2011world products use those complex shapes.<\/p>\n

Multi\u2011void profiles serve where different cavities support different functions \u2014 like wiring, drainage, reinforcement \u2014 and let one shape do many jobs at once.<\/strong><\/p>\n

\"Mat\u00e9riau
Mat\u00e9riau d'extrusion en aluminium Rainure en T<\/figcaption><\/figure>\n<\/p>\n

Why multiple voids help<\/h3>\n

Multiple voids allow splitting functions. One chamber can hold electrical wiring. Another can give structural support. A third may give space for insulation or seals. <\/p>\n

With one die you can get all these spaces inside a single extrusion. That lowers assembly work. It reduces welding or joining. It simplifies manufacturing. <\/p>\n

Also, multiple voids can improve rigidity. If walls separate cavities, the profile can resist torsion and bending in multiple directions. The internal ribs add support. <\/p>\n

Sample uses in real products<\/h3>\n
    \n
  • Fen\u00eatres et portes<\/strong>: Multi\u2011chamber profiles help improve thermal insulation. Some chambers stay solid for strength, others hold seals or weather strips, others provide wiring paths for smart locks or sensors. <\/li>\n
  • Solar panel frames and rails<\/strong>: Profiles with cavities for wiring, grounding, and panels. One cavity for mounting hooks, one for cables, one for structural strength. <\/li>\n
  • Lighting fixtures<\/strong>: A void for wiring, a void for heat dissipation, a void for structural support \u2014 in one piece. <\/li>\n
  • Cadres de machines<\/strong>: Multi\u2011void profiles let frames hold fasteners, hoses, or wiring inside, while outer walls give rigid support. <\/li>\n<\/ul>\n

    Benefits of multi\u2011void design<\/h3>\n
      \n
    • Less need for assembling multiple parts. <\/li>\n
    • Cleaner looks \u2014 no welded seams, no external joints. <\/li>\n
    • Cost and time saving \u2014 one extrusion equals many parts. <\/li>\n
    • Better performance \u2014 structure, insulation, wiring support all in one. <\/li>\n<\/ul>\n

      Les points \u00e0 surveiller<\/h3>\n

      Designing multi\u2011void shapes adds complexity. The die must have multiple mandrels and supports. Flow paths must be balanced. Cooling must be even. <\/p>\n

      If a chamber is too narrow, metal may not flow well. Long thin ribs between voids might cool too fast and crack. <\/p>\n

      Also, internal stress may build if wall thickness differs much. That can warp the profile after cooling. <\/p>\n

      When profiles are long, length tolerance must be controlled. Internal voids may expand or twist if not cooled evenly. <\/p>\n

      Because of these challenges, experienced engineers must design multi\u2011void profiles carefully. <\/p>\n

      <\/svg> Multi\u2011void aluminum profiles let one extrusion serve as structure, wiring channel, and insulation space at the same time.<\/b>Vrai<\/span><\/p>

      Different voids can be used for different functions like wiring, sealing, insulation, or structural support in a single profile.<\/p><\/div>
      \n

      <\/svg> Multi\u2011void extrusion is simpler and cheaper to design than single hollow sections.<\/b>Faux<\/span><\/p>

      Multi\u2011void shapes require more die complexity, careful flow design, and greater die cost compared to simple hollow sections.<\/p><\/div><\/p>\n

      Can thin walls maintain strength?<\/h2>\n

      At first glance, thin walls may look weak. Many fear that thin\u2011walled aluminum will bend or break easily. But in many extrusion profiles, thin walls still give good strength. The shape matters more than thickness alone.<\/p>\n

      Thin walls can keep strength if profile shape gives good support and load paths distribute stress across outer surfaces and structural ribs.<\/strong><\/p>\n

      \"Extrusions
      Extrusions d'aluminium pour l'a\u00e9rospatiale<\/figcaption><\/figure>\n<\/p>\n

      How shape helps thin walls<\/h3>\n

      When walls are thin, the design must place material where stress runs. Outer edges, corners, ribs, and flanges carry most of the stress. Flat thin walls between ribs add little strength but add weight if thick. Removing extra material lowers weight without losing much strength. <\/p>\n

      Structural ribbing inside a profile helps. Ribs make walls stay straight under bending. Ribs also spread load over a larger area. <\/p>\n

      When thin walls work well<\/h3>\n

      Thin\u2011walled aluminium profiles work in many cases: trims, frames, housings, covers, enclosures. In these, loads are not huge. The profiles mainly hold shape and alignment. <\/p>\n

      For example, a window frame may use 1.2 mm walls but still resist wind load and handle installation stresses. A lighting fixture housing may accept thin walls because load is small and weight matters. <\/p>\n

      Thin walls also help with surface treatments like anodizing or painting \u2014 less material means faster thermal equilibrium and lower cost. <\/p>\n

      Limits and cautions<\/h3>\n

      If load is heavy or impact is possible, thin\u2011wall parts can deform. Thin flat walls may bend inwards under pressure. Joints and corners must be reinforced. In long spans, thin walls risk bending mid\u2011length (buckling). <\/p>\n

      If wall thickness is uneven, stress concentration may happen. Sharp corners or sudden transitions cause weak spots. Manufacturing must ensure uniform wall thickness and good surface finish. <\/p>\n

      Design and testing for thin walls<\/h3>\n

      Good design for thin walls means:<\/p>\n

        \n
      • Use ribs or flanges to add stiffness. <\/li>\n
      • Spread load over wider areas. <\/li>\n
      • Avoid sharp corners; use gentle fillets. <\/li>\n
      • Run simulation or stress tests before final design. <\/li>\n<\/ul>\n

        Example: A profile with outer walls 2 mm thick and inner ribs 1.2 mm thick might carry bending loads well. If length is 2 meters and spacers every 500 mm, sagging stays small. <\/p>\n\n\n\n\n\n\n\n
        Type de profil<\/th>\n\u00c9paisseur de la paroi<\/th>\nUtilisation typique<\/th>\n<\/tr>\n<\/thead>\n
        Trim frame<\/td>\n1.0\u20131.5 mm<\/td>\nLight covers, window trims<\/td>\n<\/tr>\n
        Enceintes<\/td>\n1.5\u20132.0 mm<\/td>\nLight housings, panels<\/td>\n<\/tr>\n
        Structural ribs + thin skin<\/td>\n1.2\u20132.0 mm ribs, 0.8\u20131.2 mm skin<\/td>\nFrames, window\/door frames, solar panels<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

        Thin\u2011wall design reduces weight and cost. That helps where many pieces are used. It also reduces thermal mass. That helps if you need quick temperature change, like in anodizing or painting. <\/p>\n

        Still, careful design and quality control matter. Uniform thickness, proper fillets, and ribs are key. Also correct handling and installation reduce risks of dents or deformation. <\/p>\n

        <\/svg> Thin\u2011walled extruded aluminum profiles can have sufficient strength if ribs and flanges support the load.<\/b>Vrai<\/span><\/p>

        Ribs and flanges reinforce the thin walls and help distribute bending or torsional stress, keeping strength.<\/p><\/div>
        \n

        <\/svg> All thin\u2011walled aluminum profiles are too weak for structural use.<\/b>Faux<\/span><\/p>

        With good design and correct use, thin\u2011walled aluminum profiles can be structural enough for framing, enclosures, or light loads.<\/p><\/div><\/p>\n

        Conclusion<\/h2>\n

        Aluminum extrusion can make many shapes: solid bars, hollow tubes, multi\u2011void profiles, thin\u2011wall sections, ribs and flanges. Good die design and careful planning make it possible. That flexibility lets designers meet lightness, cost, and strength needs in one part.<\/p>","protected":false},"excerpt":{"rendered":"

        Aluminum Extrusion Aluminum Rolling Shutters Profile A common problem in metal building is finding a shape that is strong, light, and fits exact design needs. Many designs fail because the shape is wrong. Extruded aluminum solves that by letting designers pick almost any shape they need. Aluminum extrusion can produce simple or very complex shapes, […]<\/p>\n","protected":false},"author":6,"featured_media":5892,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_seopress_robots_primary_cat":"none","_seopress_titles_title":"","_seopress_titles_desc":"","_seopress_robots_index":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-26565","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-custom-mold"],"meta_box":{"post-to-quiz_to":[]},"_links":{"self":[{"href":"https:\/\/sinoextrud.com\/fr\/wp-json\/wp\/v2\/posts\/26565","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sinoextrud.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sinoextrud.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sinoextrud.com\/fr\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/sinoextrud.com\/fr\/wp-json\/wp\/v2\/comments?post=26565"}],"version-history":[{"count":0,"href":"https:\/\/sinoextrud.com\/fr\/wp-json\/wp\/v2\/posts\/26565\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/sinoextrud.com\/fr\/wp-json\/wp\/v2\/media\/5892"}],"wp:attachment":[{"href":"https:\/\/sinoextrud.com\/fr\/wp-json\/wp\/v2\/media?parent=26565"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sinoextrud.com\/fr\/wp-json\/wp\/v2\/categories?post=26565"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sinoextrud.com\/fr\/wp-json\/wp\/v2\/tags?post=26565"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}