淬硬钢高速铣削用量确定方法的研究

采用高速铣削技术加工淬硬钢可以大大改善材料去除率和表面粗糙度,并提高淬硬钢加工效率,降低加工成本.为获得必要的加工精度、表面质量及延长刀具寿命,铣削淬硬钢材料除精心选择刀具材料和几何参数外,必须优化铣削用量.基于淬硬钢高速铣削参数对铣削力影响的理论分析,得出高速铣削淬硬钢宜采用高转速、低进给、小切深的方式进行铣削加工的结论.比较分析了确定淬硬钢高速铣削用量的常用3种方法.     

小直径铣刀铣削淬硬钢深窄型腔的实验研究

采用Φ2 mm TiAlN涂层硬质合金铣刀对S136淬硬模具钢的深窄型腔进行中高速干式切削实验,研究走刀方式、螺旋下刀半径、螺旋角、切削深度、切削速度、进给速度等因素对切削力和振动的影响规律,为优化小直径铣刀铣削高硬材料模具深窄型腔的工艺参数提供依据.     

淬硬钢Cr12MoV高速铣削加工试验研究

针对淬硬钢Cr12MoV进行高速铣削研究,重点研究铣削速度、冷却方式对高速铣削加工表面质量(表面粗糙度Ra)的影响,结果表明,油液冷却加工表面质量比气体冷却好;采用油液冷却加工表面质量随铣削速度的增加而提高.淬硬钢的高速铣削加工既可以保证加工表面的质量,又可以获得较高的生产效率.     

高速铣削淬硬钢的研究进展

对国内外高速铣削淬硬钢的研究成果进行评述.讨论高速切削的概念和特点、切削力、金属软化效应、涂层刀具加工淬硬钢的切削性能、切屑形成机理、冷却方式以及对加工表面的影响,并提出高速铣削淬硬钢研究中的热点问题.     

小直径球头铣刀铣削淬硬钢的试验研究

通过采用直径为 1 5mm的TiAlCN涂层硬质合金球头铣刀对S136淬硬模具钢进行中高速干式切削实验 ,分析了淬硬钢铣削时切削速度、进给速度和切削深度对切削力的影响规律 ,分析了不同切削用量对铣削过程的振动和噪声的影响 ,提出了合理选择切削参数的原则和改善加工过程稳定性的途径     

淬硬模具钢SKD61的高速铣削加工研究

针对淬硬条件下的压铸模常用钢SKD61的高速铣削进行研究，结果表明：铣削速度越高，表面质量越好；油液冷却所得到加工表面质量比气体冷却的好。模具淬硬钢高速铣削加工既可以保证加工表面的质量，又可以获得较高的生产效率。     

小直径平底铣刀铣削淬硬钢拐角动力特性研究

小直径铣刀铣削淬硬钢拐角是模具加工的主要难点之一,其困难在于刀具容易损坏.采用直径φ2mm的TiAIN涂层硬质合金铣刀对HRC53淬硬模具钢拐角(拐角度数分别为60°、90°、120°)进行中速干式铣削实验,分析了小直径涂层铣刀铣削淬硬钢时切削速度、进给速度和径向切削深度对铣削力和振动的影响规律,找出最优参数.     

气体风冷高速铣削的刀具磨损研究

立铣刀高速铣削方式加工可显著提高淬硬钢模具的加工效率,但同时也存在切削温度高、刀具磨损快的问题.对刀具与工件的切削接触区域进行充分冷却及润滑是解决此问题的有效方法.对气体风冷高速切削展开刀具磨损研究,涉及两种气体冷却方法—压缩气体冷却法以及涡流管冷却法.实验结果表明,涡流管冷却法相比压缩气体冷却法可降低切削区域温度,有...     

淬硬碳素工具钢高速铣削力试验研究

对淬硬碳素工具钢T10进行了高速铣削试验,研究了铣削速度、铣削深度、铣削宽度、进给速度对铣削力的影响。结果表明：铣削力随着铣削速度的增加先增大后减小;铣削力随着铣削深度的增大而增大,且变化明显;铣削力分别随着进给速度和铣削宽度的增大而增大,但变化不明显。     

铣削条件对高速铣削淬硬钢TiAlN涂层刀具磨损的影响

针对硬度分别为50 HRC和60 HRC的Cr12MoV淬硬钢材料,采用TiAlN涂层刀具进行了高速铣削试验,重点研究了铣削方式、刀具螺旋角以及润滑方式等铣削条件对刀具磨损的影响.结果表明:高速铣削淬硬钢时,导致刀具失效的典型形式是后刀面磨损;铣削方式、刀具螺旋角以及润滑方式对刀具磨损的影响是不同的;材料硬度50 HRC时,刀具螺旋角是刀具磨损的主要影响因素;材料硬度60 HRC时,润滑方式是刀具磨损的主要影响因素.     

弹簧钢国家标准的变化

汽车行业是弹簧钢使用的大户.其消耗量就约占弹簧钢总产量的60%以上.规定弹簧钢技术条件、检验规则、试验方法等的GB/T1222-1984<弹簧钢>已被修订为2007年版本.修订后的标准于2007年8月14日发布,于2008年3月1日实施.GB/T1222-2007<弹簧钢>规定了热轧、锻制、冷拉弹簧钢的订货内容、尺寸、外型、重量及允许偏差、技术要求、试验方法、检验规则、标志及质量证明书等.     

非等径长钢筋网焊机分拣机构的设计

由于目前普遍存在的网焊机中钢筋的下料完全靠人工来操作和料卡壳的问题,所以势必会造成劳动强度大、生产成本高、故障率高,从而为后续的自动化生产带来不便,阻碍了企业工序的连贯性,使工厂难以达到自动化水平.针对非等径长钢筋下料过程中存在的以上问题,设计了一套非等径长钢筋自动下料的自动分拣机构,该机构采用PLC来控制钢筋的下料和定位问题,从而减轻了生产者的劳动强度,提高了生产效率.     

Ionic liquids as a neat lubricant applied to steel–steel contacts

This paper studies the use of 3 ionic liquids ([(NEMM)MOE][FAP], [BMP][FAP] and [BMP][NTf₂]) as neat lubricant within steel–steel contact conditions. Tribological tests (at 40 and 100 °C) were conducted in a HFRR tribometer and hence a complementary study was developed using a MTM tribometer. The wear surface on the discs was measured after the HFRR tests by confocal microscopy and also analyzed by SEM and XPS. The [BMP][NTf₂] showed the lowest friction coefficient in the MTM and HFRR tests at 40 °C but at 100 °C its tribological behavior worsened due to its lowest viscosity. Similar results were found for wear behavior. Both antifriction and antiwear results were related to the tribofilms formation from the ECR and XPS measurements.     

Wear and corrosion wear of medium carbon steel and 304 stainless steel

Wear and corrosive wear involve mechanical and chemical mechanisms and the combination of these mechanisms often results in significant mutual effects. In this paper, tribological behavior, X-ray peak broadening, and microstructure changes of carbon steel AISI 1045 and stainless steel AISI 304 samples under simultaneous wear and corrosion were investigated and the results were compared with those obtained from dry wear tests. 3.5 wt.% NaCl solution was used as the corrosion agent and a pin-on-disk tribometer was employed to perform wear and corrosive wear tests.X-ray diffraction measurements have shown that by increasing the applied load, the worn surfaces of carbon steel samples reached a constant strain at which fracture and wear occurred. Whereas in 304 stainless steel samples, by increasing the applied load, broadening of X-ray diffraction peaks was decreased.Wear tests of carbon steel and stainless steel samples have shown smaller weight losses and lower friction coefficient in the presence of corrosive environment. Study of worn surfaces suggested that depending on wear environment and applied load, different features of wear mechanisms were involved.     

钢中硫化锰的形态及对钢性能的影响

论述MnS在钢中的各种形态及其对钢性能的影响,通过降低钢中的硫含量和控制MnS的形态,可以提高钢的性能和质量.     

起重机钢结构常用材料强度的概率统计分析

国内基于统计学的钢材强度分布概型还很少,限制了可靠性设计的应用,在收集了大量Ｑ２３５、１６Ｍｎ屈服强度实测数据的基础上,运用概率统计知识进行统计分析,得到这２种钢材屈服强度的分布规律及参数,可供起重机钢结构可靠性设计时选用参考。     

Experimental load distributions for double pitch steel roller chains on steel sprockets

An experimental study was conducted to measure the load distribution in steel roller chains on steel sprockets and determine the effect of lubrication, misalignment, sprocket speed of rotation at low speeds, and slack-side load. A chain load distribution test machine was designed and constructed to conduct this investigation. Theoretical results obtained from a geometric progression load distribution model were compared to the experimental results.     

Electroplastic drawing medium-carbon steel

The electroplastic deformation of medium-carbon steels under uniaxial tension and drawing is investigated. The technology of the production of a high-tensile wire in the combination of processes of drawing and thermal treatment with a high-density current is proposed that allows the production cycle to be shortened.