ULTRA HIGH-SPEED CUTTING OF CAST IRONS WITH CONTROLLED NONMETALLIC INCLUSIONS BY cBN CUTTING TOOLS

使用立方氮化硼刀具对非金属夹杂物受控的铸铁进行超高速切削

• 批准号: 09650141
• 负责人: YAMANE Yasuo
• 金额: $ 2.05万
• 依托单位: HIROSHIMA 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 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650141/
• 关键词: cBN tool; ultra high-speed cutting; nonmetallic inclusions; cast iron

The aim of this study is to clarify the possibility of ultra-high-speed machining of the cast irons with cBN cutting tool. Ultra-high-speed face milling test tests (up to 4500 m/min) were carried out on several kinds of cast irons using cBN tools with different binders. Tool wear, cutting forces, cutting temperatures and non-metallic inclusions in cast irons adhered on the wear part of the cBN tools were examined.Results obtained were as follows ;1. Oxide protective layer consisted from Al, Si, and Mn was observed on the rake face and flank face of cBN tool when machining cast irons with high content of Al203, and the wear of the tool became small when the layer was adhered.2. The cutting speed at which the protective layer was observed on the tool depended on the content of A1203 in the cast iron, the higher content of A1203 the higher cutting speed. The maximum cutting speed was 4500 m/min at which the protective layer was observed in the tests.3. Formation of the protective layer depended on the binder of the cBN tool, the layer easily tended to adhered on the tool with ceramic binder including TiC, because TiC was oxidized easily and to combine with other oxides.4. In the process of clarifying the bonding mechanisms of cBN tools and the protective layer, it was clarified that boron nitride BN had the effect of making AlN from Al in work material, and the AIN adhered on the tool acted as a very stable protective layer. The results were presented at an International Conference.

本研究的目的是澄清的可能性，超高速切削铸铁与立方氮化硼刀具。采用不同结合剂的cBN刀具对几种铸铁进行了超高速（4500 m/min）端面铣削试验。通过对刀具磨损、切削力、切削温度和磨损部位铸铁中非金属夹杂物的检测，得出以下结论：1。cBN刀具在切削高Al 2 O3含量的铸铁时，在前刀面和后刀面均观察到由Al、Si和Mn组成的氧化物保护层，该保护层的附着使刀具磨损变小.在刀具上观察到保护层的切削速度取决于铸铁中Al 2 O3的含量，Al 2 O3的含量越高，切削速度越高。最大切割速度为4500 m/min，在此速度下，试验中观察到了保护层.保护层的形成取决于cBN刀具的粘结剂，由于TiC易氧化并与其他氧化物发生联合收割机结合，保护层易粘附在含有TiC的陶瓷粘结剂刀具上.在阐明cBN刀具与保护层的结合机理的过程中，明确了氮化硼BN具有将工件材料中的Al转化为AlN的作用，附着在刀具上的AlN起到了非常稳定的保护层的作用。研究结果已在一次国际会议上公布。

项目成果

Yasuo YAMANE: "New Suppressive Mechanisms of Tool Wear by Boron Nitride" Proc.of Int.Con.on Behaviour of Materials in Machining 12-13 Nov.,Stratford-upon-Avon,1998. 23-32 (1998)

Yasuo YAMANE：“氮化硼刀具磨损的新抑制机制”Proc.of Int.Con.on 材料加工行为，11 月 12-13 日，埃文河畔斯特拉特福，1998 年。

Yasuo Yamane: "New Suppressive Mechanisms of Tool Wear by Boron Nitride" Proc.of Int.Con.on Behavior of Materials in Machining 12-13 Nov., Stratford-upon-Avon. 23-32 (1998)

Yasuo Yamane：“氮化硼对刀具磨损的新抑制机制”Proc.of Int.Con.on 材料加工行为，11 月 12-13 日，埃文河畔斯特拉特福。