金刚石层倒角参数对PDC切削齿性能的影响规律  

Influence of diamond layer chamfer parameters on performance of PDC cutters

作　　者：张素慧 王传留 李耿 ZHANG Suhui;WANG Chuanliu;LI Geng(China Coal Research Institute,Beijing 100013,China;Xi'an Research Institute(Group)Co.,Ltd.,China Coal Technology&Engineering Corp.,Xi'an 710077,China)

机构地区：[1]煤炭科学研究总院,北京100013 [2]中煤科工西安研究院(集团)有限公司,西安710077

出　　处：《金刚石与磨料磨具工程》2024年第4期470-475,共6页Diamond & Abrasives Engineering

基　　金：陕西省重点研发计划(2022GY-146)。

摘　　要：聚晶金刚石复合片(polycrystalline diamond compact,PDC)切削齿的综合性能受金刚石层倒角参数的影响较大,特别是其抗冲击性能,但影响规律不明。为探究金刚石层倒角参数对PDC切削齿性能的影响规律,优化PDC切削齿结构并提高PDC钻头的钻进效率,采用目前应用较广的平面型和微弧型PDC切削齿,分别制作0.2、0.3、0.4、0.5 mm 4种倒角尺寸和15°、30°、45°3种倒角角度的PDC,得出不同金刚石层倒角参数的PDC切削齿受热后的耐磨性和抗冲击韧性,并对其钻进效率和破损形式进行分析。结果表明:倒角尺寸对PDC耐磨性和抗冲击韧性的影响存在的临界值约为0.3 mm,当倒角尺寸≤0.3 mm时,PDC的磨耗比大、抗冲击韧性低、破损形式多为崩刃;反之倒角尺寸>0.3 mm时,PDC的磨耗比降低、抗冲击韧性提升近1倍,累计吸收功可达1 000 J以上,且破损形式多为脱层。倒角角度对PDC耐磨性和抗冲击韧性的影响基本为线性关系,即倒角角度越小,磨耗比越大,抗冲击韧性越低。Objectives:The precise control of diamond layer chamfer parameters has a complex influence on the com-prehensive performance of PDC cutters.This control not only helps to expand ideas in PDC cutter design but also im-proves the overall efficiency of drilling tools.To fully analyze the effect of diamond layer chamfer parameters on the performance of PDC cutters,this study examined the correlation between the chamfer size and chamfer angle of the dia-mond layer and the performance of PDC cutters,namely wear resistance,impact toughness,drilling efficiency,and damage forms.It provided a scientific basis for optimizing the structure of PDC cutters to enhance the operational effi-ciency and reliability of PDC bits under complex geological conditions.Methods:The study combined experimental re-search and theoretical analysis.Two types of PDC cutters,planar type and micro-arc type,which are widely used in the market at present,were selected as experimental objects.Samples with different chamfer sizes(0.2,0.3,0.4,0.5 mm)and chamfer angles(15°,30°,45°)were prepared using precision machining techniques.The samples were systematic-ally heat-treated to simulate the actual welding process before testing,and the performance of the PDC cutters was eval-uated by analyzing wear resistance,impact toughness,and drilling efficiency.Additionally,the interaction between the PDC cutter and rock was simulated by turning experiments,and the wear area and the damage forms were observed,measured,and analyzed using a microscope.Results:The experimental results revealed the influence of diamond cham-fer parameters on the performance of PDC cutters.On the one hand,the chamfer size had a critical value of about 0.3 mm.When the chamfer size was less than or equal to this critical value,the wear ratio of PDC cutters was high,the grinding time was short,the energy level of breakage was low,impact toughness was low,and the primary form of dam-age was broken edges,which adversely affected the service life and drilling efficiency of the cutter.When

关 键 词：PDC切削齿 金刚石层倒角参数 综合性能 破损形式 

分 类 号：TE21[石油与天然气工程—油气井工程] TG74[金属学及工艺—刀具与模具] TQ164[化学工程—高温制品工业]