权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Study on Optimum Coil Design and Hardening Condition for Gear Induction Hardening

齿轮感应淬火最佳线圈设计及淬火条件研究

基本信息

批准号：
09650165
负责人：
MIYACHIKA Kouitsu
金额：
$ 2.24万
依托单位：
Tottori University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650165/
关键词：
Gear Heating Coil Induction Hardening Shaft Induced Current Density Residual Stress Hardened Layer FEM

项目摘要

An electromagnetic field analysis, a heat conduction analysis and an elastic-plastic stress analysis during induction heating and water cooling processes of shaft with uniform cross-section and shouldered shaft were carried out by the axisymmetric FEM, considering changes of the magnetic permeability, the resistivity, the thermal expansion coefficient and the yield stress with the temperature. Optimum hardening condition and coil configuration for residual stress and hardened layer were examined. 3D-FEM program for calculations of induced current density, temperature and stress during induction hardening process was developed. Residual stresses and hardened layer of gear due to single and dual frequency induction hardening were calculated by means of the FEM program, and then optimum induction hardening method for residual stress and hardened layer of gear were examined.The main results obtained from this investigation are summarized as follows.1.A chart to determine the optimum heatin … More g condition of electric power P and frequency f for residual stress due to the induction hardening of shaft with uniform cross-section was derived.2.Effective case depth of Hv=550(Hv : Vickers hardness number) due to the induction hardening of shaft with uniform cross-section increase at the middle of shaft and decreases at the end of shaft with decreasing lィイD2cィエD2, P and F (lィイD2cィエD2 : coil length).3.Axial and circumferential residual stresses σィイD2zィエD2ィイD1*ィエD1, σィイD2θィエD2ィイD1*ィエD1 of the shouldered shaft due to the induction hardening using the coil with constant inner diameter become large compressive stresses at the shaft surface only of smaller diameter in the case of lower f and the shaft surface only of larger diameter in the case of higher f.4.Surface σィイD2zィエD2ィイD1*ィエD1, σィイD2θィエD2ィイD1*ィエD1 of the shouldered shaft become large compressive stresses along the length of the shaft by carrying out the dual frequency induction hardening.5.Hardened layer of shouldered shaft occurs along the length of the shaft to certain shoulder height by carrying out the dual frequency induction hardening, and for larger shoulder height the coil must be overhung from the shaft end of smaller diameter.6.The position of maximum temperature at the end of induction heating process of gear becomes the tooth bottom of the end of face width irrespective of P and f in the case of narrower face width b, but becomes the tooth bottom of the middle of face width for lower f and the tooth tip of the middle of face width for higher f in the case of wider b.7.Contour lines of temperature at the end of induction heating process become lines along tooth profile by carrying out the dual frequency induction hardening, and residual stress and hardened layer occur along the tooth profile. Less

采用轴对称有限元方法，对等截面轴和肩轴的感应加热和水冷过程进行了电磁场分析、热传导分析和弹塑性应力分析，考虑了轴的磁导率、电阻率、热膨胀系数和屈服应力随温度的变化。研究了残余应力和硬化层的最佳淬火条件和卷材配置。开发了用于计算感应淬火过程中感应电流密度、温度和应力的三维有限元程序。利用有限元程序对齿轮单频和双频感应淬火后的残余应力和硬化层进行了计算，探讨了齿轮残余应力和硬化层的最佳感应淬火方法。主要研究结果如下：1.确定最佳加热…的曲线图2.等截面轴感应淬火的有效渗层深度Hv=550(Hv：维氏硬度数)随LィイD2CィエD2，P和F(LィイD2CィエD2：线圈长度)的减小，轴中有效渗层深度增加，端部有效渗层深度减小。3.轴向和周向残余应力σィイD2zィエD2ィイD1*ィエD1，σィイD2θィエD2ィイd1*ィエd1由于使用恒定内径线圈的感应淬火，肩轴的表面在f较低时仅在直径较小的轴面上变为大的压应力，而在较高f4的情况下仅在轴面上变得较大直径。SurfaceσィイD2zィエD2ィイd1*ィエd1，σィイD2θィエD2ィイd1*ィエd1通过进行双频感应淬火，肩轴沿轴长方向产生很大的压应力。5.双频感应淬火使肩轴硬化层沿轴长达到一定的肩部高度，对于较大的肩部高度，线圈必须从较小直径的轴端伸出。6.在较窄的齿面宽度b的情况下，齿轮感应加热过程结束时的最高温度位置成为端面宽度的齿底，但在较宽b7的情况下，低f时成为面宽中部的齿底，f较大时成为面宽中部的齿尖。通过进行双频感应淬火，感应加热结束时的温度等值线变为沿齿廓线，并沿齿形产生残余应力和硬化层。较少