Analysis of plastic flow and die design during extrusion of CPU heat sinks

Hwang, Yeong‐Maw; Shen, Chien‐Chih

doi:10.1016/j.jmatprotec.2007.11.173

Cited by 8 publications

(5 citation statements)

References 6 publications

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“…Biao et al carried out a numerical simulation on the extrusion of the aluminum profile of radiator [ 15 ]. Hwang and Shen carried out finite element analysis on the hot extrusion process of CPU aluminum profile radiator and optimized the structural parameters of the extrusion die [ 16 ]. However, what they introduce is the hot extrusion aluminum profile technology.…”

Section: Introductionmentioning

confidence: 99%

Near Net Forming Research for Fin-Typed LED Radiator

He²,

Huang

et al. 2022

Materials

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Pure aluminum radiator is the best choice for heat dissipation of various LED products at present. Its forming methods include common extrusion, die casting, forging, etc. Compared with other forming technologies, the LED radiator formed by cold forging has good heat dissipation performance, but there are some disadvantages in the forming process, such as uneven deformation, large material consumption and low die life. The cold forging process of pure aluminum fin-typed LED radiator is analyzed by the finite element method. The calculation results show that equal fillet structure of concave die is improper, leading to serious uneven flow velocity distribution during aluminum forging, inconsistent fin length, and warpage tendency. The gradient fillet structure of concave die is adopted. Numerical simulation and production test show that the gradient fillet structure design can significantly reduce the uneven metal flow. The extruded fins have a uniform length, which is conducive to reducing subsequent machining and production cost.

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Section: Introductionmentioning

confidence: 99%

Near Net Forming Research for Fin-Typed LED Radiator

He²,

Huang

et al. 2022

Materials

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“…They highlighted that the feeder structure plays a vital role in determining the velocity distribution and the die deformation. Hwang et al [15] optimized the structure of a feeder die for CPU cooling profile extrusion based on non-steady FE simulations. They reported that the position of the die opening and the welding chamber height greatly influenced the balance of flow distribution in the extrudate.…”

Section: Introductionmentioning

confidence: 99%

A Design Approach of Porthole Die for Flow Balance in Extrusion of Complex Solid Aluminum Heatsink Profile with Large Variable Wall Thickness

Truong

Hsu²,

Tong

et al. 2020

Metals

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In this study, porthole die used for extrusion of a solid heatsink profile with wall thickness variation ratio up to 15.3 was designed using finite element (FE) simulations. To improve the flow balance in the die, a design approach was introduced to find the appropriate die structure, which includes the porthole and pocket geometry correction, the bearing length adjustment, and the port bridge structure modification. Using the proposed die, the predicted velocity relative difference (VRD) and the maximum velocity difference (ΔV) of extrudate were significantly lower than those of an initial die, which was preliminarily designed based on general design experiences. The required extrusion force and the residual stress in the product were also reduced significantly. Then, the effects of the port bridge structure and welding chamber height on the behavior of the metal flow in the die were investigated. To verify the proposed die design, experimental extrusions were conducted on a 930-ton extruder. The experiment results showed that the extruded product fulfilled the requirements for dimensional tolerances. The design approach presented in this paper can be useful for practical implementation of die design when extruding similar solid heatsink profiles with large wall thickness variation.

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“…Unreasonable design can lead to a variety of product defects such as wave, bending, tearing, etc. [3][4][5]. Figure 1 shows the typical product defects when the extrusion dies are not designed properly.…”

Section: Introductionmentioning

confidence: 99%

Effects of Solid Die Types in Complex and Large-Scale Aluminum Profile Extrusion

Truong

Hsu²,

Tong

2019

Applied Sciences

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Increasing customer requirements for quality and productivity in extruding aluminum products has led to the development of different types of extrusion dies. In this study, three different types of dies, including traditional flat die, pocket die and spread die were designed to extrude complex and large-scale solid profiles. The design parameters for these dies were used from actual extrusion experience. The results obtained from steady-state simulation such as velocity, temperature, extrusion force, and die deformation were used to assess the advantages and disadvantages of the dies. Transient simulations were performed to analyze the evolution of transverse weld in the pocket and spread dies. The effects of ram speeds on the related extrusion parameters were also investigated. The research results provide useful guides for designers and engineers in selecting these types of extrusion dies. parameters of extrusion process can be obtained such as extrusion velocity, product temperature, die deformation, die stress, welding seam etc. [10][11][12]. studied. To balance the metal flow in the extrusion product, the dies were designed with a 3D model using practical experience parameters. After that, numerical simulations of extrusion were conducted by HyperXtrude 2017 software (Altair Engineering, Inc., Michigan, USA) with the Arbitrary Lagrangian-Eulerian (ALE) algorithm. The steady-state extrusion parameters, such as extrusion force, velocity, temperature, and die deformation, were investigated. The transient simulation is utilized to explore the evolution of transverse weld in the billet-to-billet extrusion process of the pocket, and the spread dies. Finally, the effects of ram speeds on the related extrusion parameters were examined. The advantages and drawbacks of these die types are analyzed and evaluated based on the obtained parameters from simulations.

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Analysis of plastic flow and die design during extrusion of CPU heat sinks

Cited by 8 publications

References 6 publications

Near Net Forming Research for Fin-Typed LED Radiator

Near Net Forming Research for Fin-Typed LED Radiator

A Design Approach of Porthole Die for Flow Balance in Extrusion of Complex Solid Aluminum Heatsink Profile with Large Variable Wall Thickness

Effects of Solid Die Types in Complex and Large-Scale Aluminum Profile Extrusion

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