Determining local distribution of convective heat transfer coefficients on the tool during orthogonal cutting

IF 4 3区 工程技术 Q1 MATHEMATICS, INTERDISCIPLINARY APPLICATIONS
Julius Wilker, Tim Göttlich, Thorsten Helmig, Rafael Solana Gómez, Hossein Askarizadeh, Reinhold Kneer
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引用次数: 0

Abstract

Purpose

Particularly during machining, large heat sources and thus high temperature gradients and mechanical stress occur in the cutting zone. By using cutting fluids, part of the heat generated can be dissipated, thereby reducing local temperatures. To quantify the cooling efficiency of the cutting fluid, the flow behaviour of the cutting fluid in vicinity of the cutting zone must be determined to derive the resulting convective heat transfer coefficients at the tool. The purpose of this paper is to investigate the local distribution of the convective heat transfer coefficient as a function of the flow boundary conditions, specifically evaluating the effects of Reynolds number, injection angle and nozzle radius.

Design/methodology/approach

The geometries, temperature fields as well as the heat sources resulting during the machining process are extracted from a chip formation simulation using finite element method (FEM) and used to set up a three-dimensional computational fluid dynamics (CFD) flow simulation.

Findings

On the tool rake face, the local distribution of the convective heat transfer coefficient can be divided into three regions. Firstly, the region where the liquid impinging jet initially strikes, then a region near the chip where the flow is strongly deflected and then the remaining region in the boundary layer region. For each region, a function is derived that describes its position, subsequently the mean convective heat transfer coefficient is determined and summarised in a Nusselt correlation as a function of the flow parameters.

Research limitations/implications

Simulation results reveal that the distribution of the convective heat transfer coefficient on the tool rake face can be divided into three distinct regions: the impingement zone where the impinging jet first strikes, the deflection zone near the chip where the flow sharply redirects and the boundary layer zone covering the remaining surface. A geometric function is derived to describe the position and extent of each of these areas. In addition, the mean convective heat transfer coefficient can be determined for each of the regions using a Nusselt correlation based on the flow parameters.

Practical implications

These correlations allow for simplified determination of the local convective heat transfer coefficient on the tool.

Originality/value

This paper introduces an innovative approach for estimating the local distribution of the convective heat transfer coefficient at the tool rake face during orthogonal cutting under cutting fluid supply. The influence of the three-dimensional flow field of the cutting fluid jet of the convective heat transfer coefficient on the tool rake face is analysed in detail in the vicinity of the chip as a function of varying Reynolds numbers, nozzle radii and injection angles within a three-dimensional geometry.

正交切削过程中刀具对流换热系数局部分布的确定
特别是在加工过程中,切削区会产生大的热源,从而产生高的温度梯度和机械应力。通过使用切削液,可以散发部分产生的热量,从而降低局部温度。为了量化切削液的冷却效率,必须确定切削区附近切削液的流动行为,从而得出刀具处的对流换热系数。本文的目的是研究对流换热系数随流动边界条件的局部分布,具体评价雷诺数、喷射角和喷嘴半径的影响。设计/方法/方法采用有限元法(FEM)从切屑形成模拟中提取加工过程中产生的几何形状、温度场以及热源,并用于建立三维计算流体力学(CFD)流动模拟。在刀具前刀面上,对流换热系数的局部分布可以划分为三个区域。首先是液体撞击射流最初撞击的区域,然后是切屑附近气流强烈偏转的区域,然后是边界层区域的剩余区域。对于每个区域,导出一个描述其位置的函数,随后确定平均对流换热系数,并将其总结为流动参数的努塞尔相关函数。仿真结果表明,刀具前刀面对流换热系数的分布可以划分为三个不同的区域:冲击射流首先撞击的碰撞区、气流急剧重定向的切屑附近偏转区和覆盖剩余表面的边界层区。一个几何函数被导出来描述这些区域的位置和范围。此外,利用基于流动参数的Nusselt相关可以确定每个区域的平均对流换热系数。实际意义这些相关性可以简化工具上局部对流换热系数的测定。本文介绍了一种估算切削液供给下正交切削时刀具前刀面对流换热系数局部分布的创新方法。详细分析了切削液射流三维流场对刀具前刀面对流换热系数的影响,分析了切削液射流三维流场对刀具前刀面对流换热系数的影响是三维几何内雷诺数、喷嘴半径和注射角变化的函数。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
9.50
自引率
11.90%
发文量
100
审稿时长
6-12 weeks
期刊介绍: The main objective of this international journal is to provide applied mathematicians, engineers and scientists engaged in computer-aided design and research in computational heat transfer and fluid dynamics, whether in academic institutions of industry, with timely and accessible information on the development, refinement and application of computer-based numerical techniques for solving problems in heat and fluid flow. - See more at: http://emeraldgrouppublishing.com/products/journals/journals.htm?id=hff#sthash.Kf80GRt8.dpuf
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