N-094型数控双端面车磨复合机床

根据OEM汽车行业高精度刹车盘的加工要求而研发的新型数控机床．属国内首创的专利产品。该产品是采用五轴控制．实施五轴三联动的车磨复合数控机床。其中最大车削直径为400mm．最大磨削直径为400mm。该产品特别适合汽车刹车盘的精加工。加工时先完成双端面的同时车削，紧接着完成双端面的同时磨削。两端面的等厚度可达0.005mm．粗糙度可达Ra0．4以上。主轴最高转速1000r／min：磨头最高转速2000r／min；砂轮最大直径350mm；X向最大行程500mm。     

产品信息

SL 60 MC转塔车床用于一次装夹全部加工极复杂的工件;加工最大直径660mm,最大长度3500mm,转塔刀架有12个刀位,备有6个动力刀具(传动功率3.7kW或5.5kW,转速50r/min～1500r/min)。刀具采用32mm方形刀杆或直径60mm镗杆,可切制螺纹最大m20;端铣刀的最大直径30mm,平面铣刀达100mm。主轴由交流电机驱动,功率选用22/18.5kW或30/22kW,转速为25r/min～2500r/min或15r/min～     

大直径薄板圆盘的车削与夹具设计

<正>图1所示为一种典型的大直径薄板零件,直径260mm,壁厚仅为5mm,且该零件的形位精度要求较高,平面度要求为0.02mm,平行度要求为0.03mm。该零件在车削加工过程中由于装夹、切削力等因素易产生变形,从而造成加工后零件平面度和平行度超差,很难保证零件的加工精度。为提高此类零件的加工质量,专门设计了一套夹具,加工出高质量的大直径薄板零件。     

φ160mm大型摇臂钻床结构及运动设计

我国普通摇臂钻床类产品,加工直径范围覆盖φ125mm以下。零件φ125mm以上孔的加工只能采用钻孔后再进行扩孔或镗孔来完成。我国大型机械制造业造船、汽轮机等行业迫切的需要一种更大钻孔直径、更大加工范围的钻床来满足零件加工的需求。哈尔滨汽轮机厂在20世纪70年代引进的φ150mm钻床至今仍在超期服役,东方汽轮机厂、大连船用柴油机厂一直需要引入钻孔直径150mm以上的摇臂钻床,所以开发钻孔直径为160mm的摇臂钻床应该具有一定的发展空间和市场潜力。     

孔内环槽直径测量仪

我厂在为国外加工工程机械部件时,有许多套类零件。其内孔都有两个环槽,槽深在6.32～8.92mm之间,槽宽3.56～5.59mm,端面至环槽最大距离为65mm。图1为其中一种,该零件孔内两环槽直径分别为φ(64.38±0.08)mm和φ(63.55±0.04)mm,尺寸公差较严,且用内径量表无法     

利用台式钻床进行超小直径孔的钻削加工

超小直径孔通常是指直径在1mm以下的孔,利用台式钻床对0．5—1mm的超小直径孔进行钻削加工是比较困难的。在加工过程中,极容易发生钻头折断或烧损。由于孔径比较小,钻头折断在工件中后,如果折断部分没有露出工件,折断在工件中的钻头比较难取出,从而造成工件报废。有时利用台式钻床根本就无法进行超小直径孔的加工。通过分析和采取相应的措施,我们曾利用Z4012台式钻床,顺利完成了在40Cr材料上加工直径为0．9mm、深15mm通孔的工作。     

双主轴车削中心

在DZ32CNC型车削中心上,用两个主轴和多达16把刀具,可完成直径在470mm以下工件的全部加工。机床的横向行程为200mm,纵向行程为300mm(速度可达24m/min)。主轴的直径为50mm,孔径为32mm。由功率为9kW(启动时间为60％时为11.5kW)、转速达8000r/min的交     

模具轮廓仿形铣削新系统

<正> 奥地利Bohlerit刀具公司最近推出一种模具轮廓仿形铣削新系统,专门用于模具制造行业中的高抗拉钢的高速切削加工。在对抗拉强度为1000N/mm~2的钢件加工中,这种新型铣削系统的进给量能达到并超过1000mm/min,其金属切除量是普通铣削系统的3～4倍,不但极大地减少了加工时间,且加工效果和生产率均十分理想。该系统的铣刀规格范围从直径16mm到160mm,采用“扣”式刀片,刀片直径规格为10mm、12mm、16mm。其中φ16～20mm铣刀为单刃(仅一个φ10mm刀片)端铣刀型。φ25～     

北京第一机床厂在CCMT 2006展出高水平产品

展位:W1-300北京第一机床厂将展出12台机床。CDHA512倒立式车削加工中心该机床最大加工直径200mm,主轴转速34～4200r/min。该机床加工效率高,占地面积小,节省空间,非常适合组成生产线。主轴与卡盘采用倒立式设计,卡盘替代机械手,自动装卡工件,使加工流程及工件上下料可一机完成     

具有高速和几何智能的加工中心

由美国俄亥俄州Mason城的Makino公司生产的A77卧式加工中心,有效地扩大了对大型件和重切削的高速柔性加工。该机床的3轴行程分别为800mm×749mm×770mm,可加工的最大工件尺寸为909mm×1 001mm(直径×高)。尺寸为630mm×630mm的托盘可承载的最大重量为1198kg。 A717的主轴可装HSK100刀柄,转速为18000r/min,用于高速加工少切削量的工件。由于结构刚性好,大功率主轴的金属去除率加工铝材料为4 195cm~3/min;加工软钢为705cm~3/min。     

用车床加工深孔的方法与装置

介绍了基于BTA原理设计的深孔钻加工装置,解决了钻头的定位和导向难题;通过不同的方案组合,可以在板料、箱体和轴类零件上加工直径16～40mm、深径比在100以内的深孔。该装置结构简单,可方便地安装在普通车床上使用。     

铝合金高速切削表面粗糙度影响因素研究

为有效降低高速切削中铝合金的表面粗糙度值,通过多因素正交试验和单因素试验对各铣削参数进行研究,结果显示:各参数对铝合金表面粗糙度影响程度从大到小的顺序是:切削深度、主轴转速、每齿进给量、行距,且转速为18000r/min,每齿进给量为0.075mm,行距和每齿进给量一致,选择较小的切削深度时,在铝合金表面可获得较好的加工质量。     

改造普通车床为镗孔专用车床

对普通车床拖板进行改造,装上镗孔装置,并在车床主轴孔中装上镗刀杆,将普通车床改造为镗孔专用车床.不仅保证了工件的加工精度要求,扩大了车床的使用范围,并且较好地解决了生产中的技术难题,取得了明显的经济效益.     

超声电解复合加工小孔工艺试验研究

为了研究超声电解复合加工难加工材料上小孔工艺,在8 mm厚的不锈钢1Cr18Ni9Ti上进行通孔加工试验。通过正交试验研究了电压、初始间隙、阴极转速和进给速度对小孔直径和表面粗糙度的影响,运用综合平衡法得出最优组合是:电压7 V、初始间隙0.2 mm、阴极转速1 600 r/min、进给速度1.6 mm/min。     

EFFECT OF COOLANT PRESSURE,NOZZLE DIAMETER,IMPINGEMENT ANGLE AND SPOT DISTANCE IN HIGH PRESSURE COOLING WITH NEAT OIL IN TURNING Ti-6AL-4V

Though titanium alloys are being increasingly sought in a wide variety of engineering and biomedical applications, their manufacturability, especially machining and grinding imposes lot of constraints. Titanium alloys are readily machinable provided the cutting velocity is in the range of 30–60 m/min. To achieve higher productivity, if the cutting velocity is enhanced to 60–120 m/min and beyond, rapid tool wear takes place diminishing the available tool life. Tool wear in machining of titanium alloys is mainly due to high cutting zone temperature localised in the vicinity of the cutting edge and enhanced chemical reactivity of titanium with the tool material. Rapid tool wear encountered in machining of titanium alloys is a challenge that needs to be overcome. High pressure cooling in machining is a very promising technology for enhancing tool life and productivity via appropriate cooling and lubrication. The present investigation is an attempt to study the effects of jet application parameters, i.e., coolant pressure, angle of impingement of the jet, spot distance and nozzle diameter on tool wear and chip morphology and to compare the effectiveness while turning Ti-6Al-4V bars under high pressure cooling with neat oil. Results indicated that at a cutting speed of 85 m/min and feed of 0.2 mm/rev, high pressure cooling provided a tool life of 24 min vis-à-vis 12 min under cryogenic cooling.     

使用用户宏编制大螺距螺纹加工程序

目前,在数控车床上加工大螺距、高精度的螺纹时,用现有的三个螺纹切削命令,由于螺纹车刀切削深度大,刀刃磨损较快,从而造成螺纹中径产生误差或牙形精度较差。而使用用户宏开发通用的螺纹加工程序,将直进式切削方法和斜进式切削方法优点综合起来可以较好地解决此类问题。     

切削参数对粗精铣合体刀具铣削加工表面质量的影响

采用硬质合金刀具,通过单因素实验对铸铝材料的表面铣削加工过程进行研究,获得最佳的切削参数,提高加工表面质量。实验以粗精铣一次完成工艺代替粗加工—精加工分步完成的加工工艺,研究粗精铣合体刀具加工中最佳的切削参数组合。实验结果表明,对于铸铝零件,切削加工的最佳切削参数组合为:切削速度v=3000r/min、进给量f=1000mm/min、背吃刀量a p=0.3mm。通过比较不同工艺下切削参数与表面质量之间的关系,得出在相同表面质量的要求下,粗精铣合体刀具在铣削过程可简化加工工艺,缩短加工时间。     

Effect of turning parameters on surface roughness of A356/5% SiC composite produced by electromagnetic stir casting

In the present investigation, A356 alloy 5 wt% SiC composite is fabricated by electromagnetic stir casting process. An attempt has been made to investigate the effect of CNC lathe process parameters like cutting speed, depth of cut, and feed rate on surface roughness during machining of A356 alloy 5 wt% SiC particulate metal-matrix composites in dry condition. Response surface methodology (Box Behnken Method) is chosen to design the experiments. The results reveal that cutting speed increases surface roughness decreases, whereas depth of cut and feed increase surface roughness increase. Optimum values of speed (190 m/min), feed (0.14 mm/rev) and depth of cut (0.20 mm) during turning of A356 alloy 5 wt% SiC composites to minimize the surface roughness (3.15μm) have been find out. The mechanical properties of A356 alloy 5 wt% SiC were also analyzed.     

Machinability issues in turning of Al-SiC (10p) metal matrix composites

The paper presents the results of an experimental investigation on the machinability of fabricated aluminum metal matrix composite (A356/SiC/10p) during continuous turning of composite rods using medium grade polycrystalline diamond (PCD 1500) inserts. MMC’s are very difficult to machine and PCD tools are considered by far, the best choice for the machining of these materials. Experiments were conducted at LMW-CNC-LAL-2 production lathe using PCD 1500 grade insert at various cutting conditions and parameters such as surface roughness, specific power consumed, and tool wear were measured. Machining was continued till the flank wear land on the tool crossed 0.4 mm. The influences of cutting speed on the insert wear and built-up edges (BUEs) formation were studied. The present results reaffirm the suitability of PCD for machining MMCs. Though BUE formation was observed at low cutting speeds, at high cutting speeds very good surface finish and low specific power consumption could be achieved.     

HIGH THROUGHPUT DRILLING OF TITANIUM ALLOYS

The experiments of high throughput drilling of Ti-6Al-4V at 183 m/min cutting speed and 156 mm3/s material removal rate using a 4 mm diameter WC-Co spiral point drill are conducted. At this material removal rate, it took only 0.57 s to drill a hole in a 6.35 mm thick Ti plate. Supplying the cutting fluid via through-the-drill holes and the balance of cutting speed and feed have proven to be critical for drill life. An inverse heat transfer model is developed to predict the heat flux and the drill temperature distribution in drilling. A three-dimensional finite element modeling of drilling is con-ducted to predict the thrust force and torque. Experimental result demonstrates that, using proper machining process parameters, tool geometry, and fine-grained WC-Co tool material, the high throughput machining of Ti alloy is technically feasible.