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Studies on Grind-hardening with the Aid of Laser Conditioning of Grinding Wheel Surface

砂轮表面激光修整磨削硬化的研究

基本信息

批准号：
18560100
负责人：
HOSAKAWA Akira
金额：
$ 2.41万
依托单位：
Kanazawa University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18560100/
关键词：
Laser conditioning Laser dressing Laser truing Grinding wheel surface Air jet Grind hardening Surface modification Grinding heat メタルボンドダイヤモンド砥石円筒研削スパークアウト

项目摘要

In general, grinding heat canoes various types of thermal damage to the workpiece, such as burning, cracks, and phase transformation. In this study, the grinding operation is regarded as. a heat treatment process called Grind-hardening. This new heat treatment method enables the phase transformation from austenite to martensite in the surface layer of steels. The cylindrical grinding tests at several infeed rates are carried out A clear hardened layer is observed, where the martensitic structure is formed having the hardness of 700HV when the infeed rate is larger than 40μm/s. The depth of hardened layer increases as infeed rate increase. The hardened layer of approximately 0.16 mm is attained in plunge grinding of chrome-molybdenum steel SCM435. The oxidized film at the ground surface layer can be removed by the spark-out grinding and this process makes the surface smooth and good circularity of the workpiece.As the second approach, laser beam is used as a noncontact thermal dressing … More tool of a bronze bond diamond wheel. The pulsed-Nd:YAG laser beam is aligned in the normal direction and focused on the wheel surface The linear stage is fed in the axial direction and this motion is coordinated with the wheel rotation, laser pulse frequency and pulse duration so as to cover the overall wheel surface by laser beam The bond material is partially removed by laser irradiation only, in which melting and vaporizing take place. In order to efficiently remove the hand material, it is necessary to spray air jet on the laser irradiating spot so as to blow away the molten binder before it solidifies again less damage of diamond particles such as micro-cracks or graphitization is observed. In order to evaluate the grinding performance of a laser-dressed wheel, the plunge grinding tests of engineering ceramics are carried out The grinding forces are almost the same as the ordinary dressed wheel, and they are roughly kept constant up to 50 mm3/mm in stock removed per unit width of cut This shows that the diamond grits are anchored firmly in the bond without thermal deterioration_ Consequently, the effective laser dressing is expectable with the appropriate dressing conditions. For the purpose of practical use, the integrated laser-air head is designed in which laser beam and air jet are shot on the same axis. In grinding with the laser-dressed wheel, the grinding faces are almost the same as those for the conventionally dressed wheel. Less

一般来说，磨削热会对工件造成各种类型的热损伤，如烧伤、裂纹和相变。在这项研究中，研磨操作被视为。一种叫做磨削硬化的热处理工艺。这种新的热处理方法能够使钢的表层发生从奥氏体到马氏体的相变。进行了几种进给速度下的外圆磨削试验，当进给速度大于40μm/s时，观察到了清晰的硬化层，硬化层中形成了马氏体组织，硬度达700 HV。淬硬层深度随进给速度的增加而增加。对SCM 435铬钼钢进行切入磨削，可获得约0.16mm的淬硬层。电火花磨削可以去除磨削表面的氧化膜，使工件表面光滑，圆度好。第二种方法是激光非接触热修整 ...更多信息青铜金刚石砂轮工具。脉冲Nd：YAG激光束沿法线方向对准并聚焦在砂轮表面。直线工作台沿轴向进给，该运动与砂轮旋转、激光脉冲频率和脉冲持续时间相协调，以便通过激光束覆盖整个砂轮表面。为了有效地去除手材料，必须在激光照射点上喷射空气射流，以便在熔融粘合剂再次固化之前吹走熔融粘合剂，从而观察到金刚石颗粒的较小损伤，例如微裂纹或石墨化。为了评价激光修整砂轮的磨削性能，对工程陶瓷进行了切入磨削试验。结果表明，激光修整砂轮的磨削力与普通修整砂轮的磨削力基本相同，单位切宽磨削量可达50 mm ~ 3/mm。在适当的修整条件下，可以获得有效的激光修整。从实用角度出发，设计了一种激光-空气一体化头，将激光束和空气射流同轴发射。在用激光修整的砂轮进行磨削时，磨削面几乎与常规修整的砂轮相同。少