Extrusion Processes

00:02:16
https://www.youtube.com/watch?v=Y75IQksBb0M

概要

TLDRThe video provides an overview of direct hot extrusion, a manufacturing process where a heated billet is forced through a die. It explains the mechanics of the process, including the role of friction, lubrication, and the impact of billet geometry on extrusion force. The video also highlights the operation of hydraulic presses used for hot extrusion and the importance of the extrusion ratio in determining the efficiency of the process.

収穫

  • 🔧 Direct hot extrusion involves forcing a heated billet through a die.
  • 📏 The extrusion force is influenced by friction and lubrication.
  • 💡 The force increases as the billet is upset and decreases upon breakthrough.
  • 🏗️ Hot extrusion is typically performed on horizontal hydraulic presses.
  • 📊 The extrusion ratio is crucial for understanding the process efficiency.

タイムライン

  • 00:00:00 - 00:02:16

    The video discusses the primary type of hot extrusion, which is direct or forward extrusion. In this process, a hot billet is placed in a thick-walled container and pushed through an extrusion die by a ram and a reusable dummy block. The metal flows in the same direction as the ram's motion, and the extrusion force is influenced by friction between the billet and the container. Lubrication can help reduce this friction. The force required for extrusion increases as the billet fills the container and reaches a breakthrough point, after which it decreases until a minimum force is reached, then rises again as the billet thins. Hot extrusion is typically conducted on horizontal hydraulic presses, with force capacity depending on various factors such as material, cross-section, and temperature. The extrusion ratio is defined as the cross-sectional area of the container divided by that of the die openings.

マインドマップ

ビデオQ&A

  • What is direct hot extrusion?

    Direct hot extrusion is a process where a hot billet is forced through a die using a ram.

  • What factors affect extrusion force?

    Extrusion force is affected by friction between the billet and container, lubrication, and the geometry of the billet.

  • How is the extrusion ratio calculated?

    The extrusion ratio is calculated by dividing the cross-sectional area of the container liner by the cross-sectional area of the die openings.

  • What type of presses are used for hot extrusion?

    Hot extrusion is most commonly performed on horizontal hydraulic presses.

  • What happens to the extrusion force during the process?

    The extrusion force increases as the billet is upset, then declines upon breakthrough, and rises again as the billet thins.

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  • 00:00:01
    [Music]
  • 00:00:06
    the primary type of hot Extrusion is
  • 00:00:09
    direct or forward
  • 00:00:11
    Extrusion in direct Extrusion the hot
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    Billet is loaded into a thick wall
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    container and forced through an
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    extrusion die secured in a
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    holder the force for extruding is
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    applied by a ramp along with an
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    intermediate reusable dummy
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    block Metal Flow from the D is in the
  • 00:00:34
    same direction as the forward motion of
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    the
  • 00:00:37
    ram since the surface of the Billet
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    length slides along the wall of the
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    container Extrusion Force depends on the
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    friction between the Billet length and
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    the container and the
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    material the friction portion of the
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    force can be reduced by using
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    lubrication Force increases rapidly as
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    the Billet is upset to fill the
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    container
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    then increases further as breakthrough
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    Force before Extrusion
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    begins upon breakthrough the force
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    declines as Billet length decreases
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    until a minimum force is reached as the
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    Billet thins the force rapidly rises
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    again to continue Metal Flow radially
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    toward the D
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    opening resistance to deoration or Force
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    requirements increase markedly as the
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    thickness of the butt or unused bill it
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    portion
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    decreases hot Extrusion is most commonly
  • 00:01:36
    performed on horizontal hydraulic
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    presses hot Extrusion presses are
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    usually rated in force capacity which
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    translates to the amount of pressure
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    applied to the Billet that pressure
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    depends on Billet material and temper
  • 00:01:52
    its cross-section and complexity length
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    and temperature Extrusion speed and
  • 00:01:58
    reduction or Extrusion
  • 00:02:00
    ratio the Extrusion ratio equals the
  • 00:02:03
    cross-sectional area of the container
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    liner divided by the cross-sectional
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    area of the die openings
タグ
  • hot extrusion
  • direct extrusion
  • billet
  • extrusion force
  • hydraulic presses
  • friction
  • lubrication
  • extrusion ratio
  • manufacturing process
  • metal flow