影响拉丝模使用寿命因素分析及改进的措施

通过多年来的实践总结,从拉丝模模芯选用与热装配钢套的精度,拉丝模工作区的几何尺寸设计,拉丝模工作区的加工,拉拔钢丝的质量和润滑方面分析了影响拉丝模使用寿命的因素。通过分析知道要保证拉丝模有很好的使用寿命,就必须要从拉丝模选材、设计、加工等方面综合考虑,从而提高产品质量,降低成本消耗。     

国外拉丝模加工方法及材料特性综述

综述了国外拉丝模的材料、加工方法、加工设备及提高拉丝模质量和使用寿命的有关措施。     

提高硬质合金拉丝模寿命的研究进展

如何提高使用寿命是硬质合金拉丝模研究的重要方向.而模芯材质、内孔涂层和内孔结构设计是影响硬质合金拉丝模寿命的重要因素.由于硬质合金拉丝模存在耐磨性较差、寿命较短的缺点,本文从基体材质优化、涂层处理、内孔结构优化三个方向,介绍了提高其寿命的研究进展.通过以下方法可以有效地提高硬质合金拉丝模的使用寿命:低钴超细晶硬质合金,...     

湘潭钢铁公司将直接水冷拉丝模应用于钢丝生产

钢丝在拉拔过程中 ,拉丝模质量的好坏直接影响钢丝生产质量、产量、模耗、能耗。为了延长拉丝模的使用寿命 ,降低拉丝模使用成本 ,湘潭钢铁公司钢丝绳厂从 1998年起选定锥形直接水冷拉丝模作为定型拉丝模推广使用 ,经过一年多的使用达到了设计要求。　　该锥形直冷模采用和传统拉丝模相同的材质 ,模套用 45钢 ,模芯为硬质合金 ,其牌号为 YG3或 YG3X。模孔的入口锥、润滑锥、工作锥、定径带出口锥和传统拉丝模相同。在结构上 ,锥形直冷模的模芯和模套按 1∶ 15的锥度配合 ,模套的内壁上开有水冷却槽、槽外钻有水冷却孔。模套的内孔及模芯均…     

金刚石涂层模在高碳钢拉丝中的应用研究

为研究金刚石涂层拉丝模在高碳高强度钢丝拉拔领域的运用,采用金刚石涂层与钨钢拉拔模拉拔80#钢丝进行对比研究分析。研究结果表明,金刚石涂层拉丝模摩擦系数较低的优势在高碳钢丝拉拔中未有明显体现,但较大规格模具使用寿命优势极为明显,D≥2.03mm模具使用寿命达400t以上,拉拔钢丝尺寸稳定性较好,且表面粗糙度较低。     

添加稀土的YGR8硬质合金拉丝模研究

添加微量稀土添加剂制取的ＹＧＲ８新牌号合金的抗弯强度，冲击韧性提高１０％以上。含稀土的ＹＧＲ８拉丝模的使用寿命比不含稀土的ＹＧ８拉丝模提高１倍左右。利用电子探针，能谱仪，Ｘ射线衍射分析等手段对ＹＧＲ８合金做了显微结构分析，阐述了稀土强化ＹＧ８合金的作用机理。     

CVD涂层在硬质合金拉丝模上的应用

用化学气相沉积法涂覆ＴｉＣ－Ｔｉ（ＣＮ）－ＴｉＮ耐磨涂层是提高硬质合金拉丝模使用寿命的有途径，经工业试验，涂层模比非涂层模可提高使用寿命１－４倍。     

拉丝模孔型测量仪的研制

针对高速拉丝机对拉丝模孔型结构的严格要求及拉丝模具生产和维修过程的需要,设计并研制了一套实用的拉丝模孔型测量仪。经过半年多的使用表明,拉丝模孔型测量仪使用方便、性能稳定,拉丝生产线上模具的损耗量大幅度下降。     

拉丝模孔型对钢丝性能的影响

钢丝在拉拔时,拉丝模工作锥角度增大,会增大钢丝的过量变形,同时也增大了拉拔力,导致钢丝温度升高;拉丝模工作锥角度减小,虽减少了钢丝的过量变形,但增大了钢丝与模子的接触面积,使摩擦力有一定程度的增加,同样导致钢丝温度升高。试验表明:拉拔时钢丝温度升高与钢丝的过量变形和摩擦力都有关。小角度工作锥拉丝模拉拔出来的钢丝性能比大角度工作锥拉丝模拉拔出来的钢丝性能要好,拉丝模寿命也较长。     

湿式拉丝用润滑液的研制

文中主要论述了四种新型润滑剂的试验室和生产机组的试验,结果表明:在现有生产条件下,利用这种新型润滑剂能显著提高拉丝模的使用寿命,如利用5％浓度的D-3号乳化液单模生产量较使用营口乳化液单模生产量可从386kg提高到448.2kg,从而使拔丝模的消耗量降低了16.1％。     

A calculation of the redundant deformation factor in the wiredrawing of non-ferrous metals

Axisymmetric wiredrawing in a conical die channel, including localized plastic shear and tension deformations, leads to deformation heterogeneity in both longitudinal and transverse sections of a treated metal. The redundant shear deformation factor is used to analyze it; this factor is determined analytically or on the basis of experimental measurements of the microhardness distribution over the sections of wires or rods of nonferrous metals of large diameters. Based on the Avitzur solution [3] obtained by the upper-bound method using kinematically possible trapezoidal and spherical velocity fields, the expression is derived to calculate the redundant shear deformation factor. The effect of the geometric parameter of the deformation region on the strain heterogeneity in the course of wiredrawing is analyzed. The calculated and experimental data on wiredrawing of copper are compared.     

铜粉对连铸连轧铜杆性能影响浅析

随着国内电力、电子行业的迅猛发展,电线、电缆等行业发展壮大,作为主要原材料的铜杆已经成为目前市场主要消耗的铜加工产品。铜杆品质已作为铜杆生产商之间市场竞争的主要筹码。由于铜杆多需要继续拉丝深加工,因此,下游客户对铜杆拉丝性能也有了更为严格的要求。拉丝过程中产生的铜粉也成为了铜杆生产商和铜杆下游用户关注的焦点。文章将分析铜粉产生的原因,寻找降低拉丝铜粉的针对性措施。     

铁铬铝合金裂纹的形成

应用声发射及电镜技术,研究了铁铬铝合金在生产中裂纹的形成条件。
试验表明:沿拉拔方向导致裂纹的形成其主要原因是氢致滞后破坏;碳化物在晶界附近析出可降低合金的塑性;此外,合金的脆性转变温度较高,热应力也可以产生微裂纹。     

基于智能控制的直进式拉丝机控制系统

针对直进式拉丝机的特点,设计研制了智能控制器,保持拉丝机拉拔过程中的反拉力恒定。结果表明,该系统能有效抑制反拉力的波动,实时检测出拉模的磨损。     

利用价值工程理论采用航天喷焊技术开创设备管理新局面

介绍利用价值工程理论,探讨研究冶金行业采用航天喷焊技术解决拉丝机罐表面硬度低、耐磨性差的技术难题。     

Mechanical Properties, Purifying Techniques and Processing Methods of Metal Yttrium

The mechanical properties of metal yttrium such as strength, plasticity, hardness and elasticity were introduced. The purifying techniques of yttrium were discussed in detail. The processing methods for metal yttrium including extruding, forging, rolling, wiredrawing and welding were also introduced. Finally, the potential use of yttrium and its alloys were prospected.     

Subgrain strengthening of aluminum conductor wires

The influence of wire processing variables on the formation of subgrain structures and strengthening in three aluminum conductor materials is described. Electrical conductor grade aluminum, an Al-Fe-Mg alloy and an Al-Fe-Co alloy each develop subgrain structures with mean linear intercepts (?L) in the range of 0.4 to 1.5 μm with several sequences of wiredrawing and partial annealing. The yield strengths of these wires were found to obey a a = σ₀ +k(?L)^m relationship, with an exponentm = -1 independent of the processing sequence used to arrive at the structure. The role of precipitate particles in the alloys is to raisek above that for EC-A1 while Mg in solid solution increases σ₀. The precipitates also affect the development of the substructure during the wiredrawing and annealing.

     

Subgrain strengthening of aluminum conductor wires

The influence of wire processing variables on the formation of subgrain structures and strengthening in three aluminum conductor materials is described. Electrical conductor grade aluminum, an Al-Fe-Mg alloy and an Al-Fe-Co alloy each develop subgrain structures with mean linear intercepts (•L) in the range of 0.4 to 1.5 μm with several sequences of wiredrawing and partial annealing. The yield strengths of these wires were found to obey a a = σ₀ +k(•L) ^m relationship, with an exponentm = -1 independent of the processing sequence used to arrive at the structure. The role of precipitate particles in the alloys is to raisek above that for EC-A1 while Mg in solid solution increases σ₀. The precipitates also affect the development of the substructure during the wiredrawing and annealing.     

低锡锌基合金无铅喷金丝工艺研究

对Sn30Zn合金喷金丝的配制、熔体净化、铸锭、热挤压、连续轧制、退火及拉丝等关键技术进行了研究,并对制备的Sn30Zn合金喷金丝进行了检测,确定了生产优质高性能低锡锡锌丝的较佳工艺参数,此工艺生产的Sn30Zn喷金丝产品在化学成分及物理性能上均达到要求。