高速钢麻花钻的磨损试验研究

麻花钻是实现孔加工的重要工具,然而切削刃口的快速磨损是制约钻孔质量和钻头寿命的重要因素。基于产品抽样钻孔试验与正交试验,本文对高速钢麻花钻的磨损、破损等失效形式进行了综合分析,探讨了以钻孔直径为评价指标时的孔加工数量与孔径的关系,并对麻花钻磨损的关键影响因素进行了正交试验研究。结果表明,麻花钻磨损与破损形式主要有主切削刃前刀面与后刀面磨损、横刃磨损、刃带磨损、外圆转角磨损、崩刃等;切削速度对麻花钻磨损影响最大、进给量次之、孔深影响最小;此外,随着加工孔数量的增加,孔径呈减小趋势。     

大型钢钢锭切割加工工艺技术

根据HDS车轮钢钢锭材料性能及加工条件 ,选择高性能高速钢M 42刀具及铝高速钢M2Al刀具进行切割试验。试验表明采用铝高速钢M 2Al刀具进行钢锭切割 ,刀具耐用度明显提高     

氟金云母陶瓷车削加工中刀具磨损的研究

分别用高速钢刀具、硬质合金刀具和Si3N4陶瓷刀具对氟金云母可加工陶瓷进行车削加工试验,考察了氟金云母陶瓷车削加工中刀具的磨损过程、磨损形态及失效原因。SEM电镜观察和能谱分析表明,刀具磨损主要发生在后刀面和刀尖处,刀具磨损的主要形式有磨料磨损、粘结磨损,材料高硬度、低热导率是引起刀具磨损的主要原因。刀具破损的主要形式为高速钢刀具切削刃塑性变形和陶瓷刀具的崩刃。刀具与工件的组织不均匀,以及切削过程中产生的冲击性机械应力和热应力是刀具破损的主要原因。     

多刃尖麻花钻的标准化与产业化

在现代金属切削刀具领域,基本集中于可转位硬质合金涂层刀具,CBN刀具、陶瓷刀具等等.然而一个容忽视的现实是,中国高速钢麻花钻的产量、销量在急剧增加,中国机加工行业用量最大的还是高速钢麻花钻,全世界还有巨大的民用麻花钻市场(用于手电钻、台钻等).因此已使用了上百年,近来被人忽视的高速钢麻花钻仍应该归属于现代金属切削刀具范畴.     

不锈钢用高速钢麻花钻的设计和分析

为提高不锈钢材料钻孔加工效率和麻花钻使用寿命,对麻花钻螺旋槽、钻尖和顶角等关键几何参数进行针对性设计,有效克服不锈钢切削性能差且不易加工的问题;采用高性能高速钢材料制造,开发适应不锈钢材料加工的专用高速钢麻花钻。通过切削试验对比和验证的方法,分析不锈钢用高速钢麻花钻切削性能的可靠性。     

镍基高温合金高速切削加工性

镍基高温合金具有优良的高温强度以及良好的热稳定性和抗热疲劳性能,广泛应用于航空发动机、燃气涡轮机等领域。但其可加工性极差,切削过程中刀具迅速磨损,加工效率较低。本文介绍了镍基高温合金高速切削加工性的研究进展,重点阐述了适宜高速切削镍基高温合金的陶瓷和PCBN刀具及加工参数,并总结了切削过程中刀具的失效形式和磨损机理,以及利用辅助加工方法等实现陶瓷刀具对镍基高温合金精加工的可能性。为高速切削镍基高温合金加工刀具的快速选择及加工工艺的改进提供了参考。     

功率、切削力、AE组合刀具监控系统的研究

1 引言 切削过程中,刀具在高温和高压条件下工作,由于受到工件、切屑的剧烈摩擦,刀具在前、后面接触区域内会产生磨损,且随切削时间的增加磨损量逐渐增大.磨损较轻时使刀具的几何形状和加工工件尺寸发生改变,严重时将引起刀具的失效(失效原因主要包括刀具磨钝、破损和刀刃塑性变形及热磨损等).     

高速钢轧辊的加工特性与切削刀具研究

分析了铸造高速钢轧辊的加工特性,选用PCBN刀具作为高速钢轧辊的切削刀具。研究了PCBN刀具在高速钢轧辊切削加工中的应用,包括刀具牌号、几何形状和切削参数的合理选择,分析了刀具提前失效的原因并提出了解决措施。     

MoS2／Zr复合涂层高速钢刀具的切削性能研究

采用中频磁控溅射和多弧离子镀相结合的工艺在M2高速钢麻花钻表面沉积制备了MoS2/Zr复合涂层,考察了复合涂层的表面形貌及力学性能,在干式切削条件下研究了复合涂层刀具钻削45钢的切削性能.结果表明,与纯MoS2 涂层相比,MoS2/Zr 复合涂层的硬度显著提高,与无涂层高速钢刀具相比,MoS2/Zr复合涂层刀具的切削能力提高了约4倍.复合涂层的存在使得刀具主切削刃的后刀面磨损量明显减小,刀具的黏结磨损和磨粒磨损程度显著降低.MoS2/Zr复合涂层刀具后刀面和横刃的磨损形式主要为涂层的分层剥落,同时伴随有一定程度的黏结磨损和磨粒磨损.     

离心浇铸合金铸铁车削机理试验研究

通过切削试验,研究了GC1105、H13A和KY2100刀具进行离心浇铸合金铸铁切削时的刀具失效机理.基于刀具磨损形貌,分析刀具磨损特征和磨损过程.研究表明:非涂层硬质合金刀具H13A磨损最快,刀具寿命最短;GC1105刀具由于有着涂层保护,前期磨损较小;GC1105、H13A两种硬质合金刀片的前刀面刃口附近出现了月牙洼磨损;在加工强度和高温强度较高的合金铸铁时,KY2100陶瓷刀具有着较高的加工效率和更长的刀具寿命.     

麻花钻磨损特性的研究

通过对调质合金结构钢的大量钻削试验,研究了麻花钻磨损区的图形特征和磨损机理以及钻头失效与磨损图形参数、钻头切削寿命与钻削速度的关系。结果表明,麻花钻的磨损具有非线性特征,钻头转角和主刀刃及横刃区有两个显著不同的磨损区,随钻削速度的提高,这两个磨损区的特征差异及磨损带宽度之比明显增大。在钻削速度较低、钻头失效时,两个磨损区为较均衡的磨粒磨损和粘结磨损;钻削速度较高时,转角区剧烈的粘结磨损和氧化磨损使钻头加快失效,而主刀刃及横刃上的磨损却很小。受此影响,麻花钻的磨钝标准、耐用度问题较为复杂,钻头的寿命（Ｔ）－速度（Ｖ）曲线的泰勒特性范围很窄。     

Cutting performance of an indexable insert drill for difficult-to-cut materials under supplied oil mist

In this study, the cutting performance of an indexable insert drill with an asymmetric geometry for cutting difficult-to-cut materials was investigated. A solid twist drill with a symmetric geometry was used to compare the cutting characteristics. The cutting characteristics were evaluated using the thrust force, inner-surface roughness of the drilled hole, wear behavior, and tool temperature. Workpieces made of stainless steel, titanium alloy, and nickel-based alloy were selected as difficult-to-cut materials, and carbon steel was also selected. The tool temperature was higher in the order of carbon steel, stainless steel, titanium alloy, and nickel-based alloy for every drill under minimum quantity lubrication cutting. The influence of the workpiece material on the thrust force was different from that of the tool temperature for the indexable insert drill, whereas that of the solid twist drill was similar to the tool temperature tendency. When cutting the titanium alloy and nickel-based alloy, the tool temperature and thrust force of the indexable insert drill were lower than those of the solid-type twist drill. The inner-surface roughness of a hole drilled with the indexable insert drill had almost the same quality as that of a hole drilled with the solid-type twist drill when cutting the difficult-to-cut materials. The wear behavior of the indexable insert drill was remarkably different from that of the solid-type twist drill, and the flaking of the coating and the abrasion wear at the rake face were notable in the indexable insert drill.     

轴向振动钻削中麻花钻的失效形式分析

基于硬铝和不锈钢的振动钻削试验,对振动钻削中的麻花钻的失效形式及其产生原因进行了研究,并与普通钻削中的失效形态进行了对比分析.研究结果表明:与普通钻削相比,在合理的振动参数下,振动钻削时麻花钻的前后刀面磨损现象明显减弱,且更均匀化,横刃和外缘点磨损很少发生;钻头出现折断、主刃的崩刃和剥落等破损的几率也大大减小,但是若振幅过大,易出现横刃处的崩刃现象.＃     

Cutting characteristics of twist drill having cutting edges for drilling and reaming

In this study, the cutting characteristics of a drill reamer, which has conventional twist drill cutting edges appended for reaming, were investigated. A drill reamer has three types of cutting edges, whose roles are drilling, semi-finishing, and finishing. The cutting characteristics of a conventional twist drill were compared to those of the drill reamer. The cutting characteristics were evaluated using the thrust force, cutting torque, surface roughness, wear behavior of the cutting edges, and cutting edge temperature. The study used a workpiece made of carbon steel. The temperature of the cutting edge for reaming reached a maximum value of approximately 420°C, even though the depth of the cut was very small. The inner surface roughness with the drill reamer was superior to that with the conventional drill, even under dry and low-speed cutting conditions. The abrasive wear observed on the margin face of the cutting edge used for reaming.     

Effects of geometric structure of twist drill bits and cutting condition on tool life in drilling 42CrMo ultrahigh-strength steel

To investigate the influence of the geometric structure of coated cemented carbide twist drills on the drill tool life, drilling experiments of 42CrMo steel were carried out at various cutting parameters. The geometric structure parameters of the specially manufactured drill bits were designed by the multifactor orthogonal experiment method. The effects of cutting edge preparation, drill point geometry, and flute geometry on the tool wear were investigated by the range analysis and variance analysis. And their effects on chip pattern were also studied. Then the influence of cutting parameters on the tool life was investigated. Based on these investigations and extending the tool life, the optimized geometric structure was the honed cutting edge with a radius of 0.06 mm and conventional conical flank, and the corresponding cutting parameters were 80 m/min and 0.18 mm/rev. At last, the tool wear characteristics were discussed and the main wear mechanisms were abrasive wear, adhesive wear, coating exfoliation, and tipping.     

CrAlTiN梯度涂层高速钢刀具的切削性能研究

用闭合场非平衡磁控溅射离子镀PVD涂层工艺在高速钢麻花钻上沉积了CrA lTiN梯度涂层。在干式切削条件下,对45#号钢和30CrMnS iA钢进行了钻削试验。通过涂层与未涂层钻头的寿命、磨损和切削力等试验比较,表明CrA lTiN梯度涂层钻头的切削性能远优于未涂层钻头,是一种极有发展前途的刀具涂层。     

不锈钢材质钻削加工的技术改进

通过改进标准麻花钻的几何参数、合理选择切削速度和切削液,改善了不锈钢材料的钻削加工状况,提高表面质量和加工效率.     

Performance and failure of high speed steel drills related to wear

Three high speed steel grades, representing low, medium and high contents of alloying elements, were investigated in a comparative drill performance test using two different work materials. The results are discussed with reference to the observed wear mechanisms. Since drill performance is usually expressed as number of holes to failure, relationships between gradual wear and final failure of the drills are emphasized.The performance tests resulted in chisel edge, crater, flank and margin wear. The corresponding wear mechanisms were studied with the aid of scanning electron and light optical microscopy. The most important mechanisms are (1) abrasive wear for drilling in a plain carbon steel and (2) adhesive wear for drilling in a quenched and tempered steel.