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相关概念视频

Induction01:16

Induction

5.5K
An emf is induced when the magnetic field in a coil is changed by pushing a bar magnet into or out of the coil. emfs of opposite signs are produced by motion in opposite directions, and the directions of emfs are also reversed by reversing poles. The same results are produced if the coil is moved rather than the magnet—it is the relative motion that is important. The faster the motion, the greater the emf. Additionally, there is no emf when the magnet is stationary relative to the coil.
A...
5.5K
Inductors01:20

Inductors

6.0K
An inductor, also known as a choke, is a circuit component created to have a specific inductance. Inductors are among the crucial circuit components used in modern electronics, along with resistors and capacitors. They serve as a barrier against changes in a circuit's current. An inductor tends to suppress current changes in an alternating-current circuit that are faster than desired. In a direct-current circuit, an inductor aids in preserving a constant current despite changes in the...
6.0K
Induced Electric Fields: Applications01:27

Induced Electric Fields: Applications

2.5K
An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...
2.5K
Induced Electric Fields01:23

Induced Electric Fields

4.5K
The fact that emfs are induced in circuits implies that work is being done on the conduction electrons in the wires. What can possibly be the source of this work? We know that it’s neither a battery nor a magnetic field, as a battery does not have to be present in a circuit where current is induced, and magnetic fields never do any work on moving charges. The source of the work is in fact an electric field that is induced in the wires. For example, if a stationary conductor is placed in a...
4.5K

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相关实验视频

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Near-Infrared Temperature Measurement Technique for Water Surrounding an Induction-heated Small Magnetic Sphere
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Near-Infrared Temperature Measurement Technique for Water Surrounding an Induction-heated Small Magnetic Sphere

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内部感应加热用于注射成型中的局部加热.

Thanh Trung Do1, Huynh Duc Thuan2,3,4, Tran Minh The Uyen1

  • 1Faculty of Mechanical Engineering, Ho Chi Minh City University of Technology and Education, Ho Chi Minh City 71307, Vietnam.

Polymers
|November 13, 2025
PubMed
概括

内部感应加热 (In-IH) 为薄壁聚烯注塑提供快速,节能的模具温度控制. 这种先进的方法通过精确管理局部加热来提高融流量和产品质量.

关键词:
注塑成型的注射成型是什么内部的感应加热 (In-IH)融化流程长度 融化流程长度模具温度控制 模具温度控制聚烯 (PP) 是一种薄壁成型模具的成型方式

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Experimental Procedure for Warm Spinning of Cast Aluminum Components
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相关实验视频

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科学领域:

  • 材料科学 材料科学 材料科学
  • 制造业 工程 制造工程
  • 聚合物加工 聚合物加工

背景情况:

  • 传统的注塑成型温度控制速度缓慢,耗费大量能源.
  • 薄壁部件需要精确的,局部的模具加热以获得最佳质量.
  • 现有的方法在快速加热和能源效率方面扎.

研究的目的:

  • 介绍和评估用于薄壁聚烯注塑的内部诱导加热 (In-IH).
  • 研究插件几何和加热参数对In-IH性能的影响.
  • 使用In-IH评估融化流和产品质量的提升.

主要方法:

  • 开发了一个带有集成感应电路的In-IH系统.
  • 进行了加热特征的数值模拟和实验分析.
  • 使用各种In-IH参数进行模具填充实验.
  • 分析了插件厚度,宽度和温度分布之间的关系.

主要成果:

  • 更薄的插件 (0.5毫米) 实现了明显更高的温度 (~550°C) 比较厚的插件 (2.0毫米,~80°C).
  • 更窄的插件 (25毫米) 有效地集中了热量,而更宽的插件提高了均性.
  • 在-IH显著提高了聚烯的流动性,在180°C时,流量长度增加了高达95%.
  • 模拟和实验结果显示出很好的一致性 (最大10%的偏差).

结论:

  • 在IH提供快速,节能,精确的局部模具温度控制.
  • In-IH系统增强了融流量,并改善了薄壁PP注塑中的产品质量.
  • 优化插件几何和加热参数对于有效的In-IH应用至关重要.