GH4169高温合金的加工策略

高温合金是一种在航天飞机、运载火箭和相控阵雷达等产品上得到广泛应用的难加工材料,选择合适的刀具材料和切削用量是进行优质、高效、低消耗的精益生产时遇到的技术瓶颈。针对GH4169高温合金进行了切削加工实验,探讨了不同刀具在加工高温合金时的切削温度与刀具磨损情况,并通过硬质合金、陶瓷刀具材料与GH4169工件材料的高温特性研究,得到高温硬度特性曲线。切削实验与高温硬度实验的综合研究结果表明,由于硬质合金的高温硬度衰减较快,硬质合金刀具加工高温合金时切削温度应不高于600℃,宜采用较低切削速度的加工策略以减缓刀具磨损;陶瓷刀具的高温性能优越,宜在切削温度高于700℃的条件下加工高温合金,即可以采用较高的切削速度实现高温合金的高效、高质量加工。     

基于响应曲面法的硬质合金加工切削参数优化

在机械加工中切削参数的选择对加工效率、加工质量和生产成本有着重要影响,特别是在硬质合金等难加工材料的加工过程中,由于材料具有较高的硬度和强度,加工性能较差,切削参数的合理优化是此类材料加工中必不可少的环节。针对采用PCBN刀具进行YG20硬质合金车削的加工过程,以单位材料去除体积下的刀具后刀面相对磨损量为优化目标,基于响应曲面法及中心组合试验设计(CCD)进行了系列切削试验,建立了刀具后刀面相对磨损量的预测模型,利用响应曲面法获得刀具后刀面相对磨损量的响应曲面及等高线图,直观地分析了切削参数对其影响规律,进一步选择了最优切削参数,并进行了实验验证。     

硬质合金刀具在金属切削中的应用优化

硬质合金刀具以其高耐热性、韧性等特点,在金属切削中具有良好的应用价值。分析金属切削原理,明确优化硬质合金刀具应用质量需要严格把控刀具的各项参数。具体加工中,技术人员应根据具体加工需求确定硬质合金刀具材料、结构及其前角、切削刃倾角等参数。为充分发挥硬质合金刀具的应用优势,提出合理选择切削工具材料、充分应用仿真技术、选择适度切削量、抑制与消除积屑瘤以及合理应用切削液等应用措施。     

用陶瓷、涂层硬质合金镗铰高强度钢大直径精密深孔的试验研究

本文分析了陶瓷、涂层硬质合金等刀具材料用于镗铰难加工材料的大直径精密深孔的可行性,通过大量切削实验,优选出适于加工高强度炮钢的刀具材料和合理切削条件。对于难加工材料的大直径精密深孔加工有参考价值。     

自回转刀具的设计及切削性能

介绍了硬质合金自回转刀具工作原理及结构特点．并通过与可转位刀具的对比切削试验．证明其切削力小．刀具磨损轻微；在切削难加工材料时，宜在高速和较大进给量条件下工作．是切削难加工材料比较理想的刀具．     

CVD金刚石厚膜刀具切削性能的试验研究

分析了CVD金刚石厚膜刀具材料的性能特点 ,对CVD金刚石厚膜车刀进行了精密切削和难加工复合材料切削试验 ,结果表明 :CVD金刚石厚膜刀具加工铝合金的表面粗糙度可达Ra0 0 5 μm ;切削难加工复合材料时刀具耐磨性和使用寿命明显优于硬质合金刀具、PCBN刀具和PCD刀具     

低温冷风高速切削时硬质合金涂层刀具磨损的研究

分别在常温微润滑、低温冷风和低温冷风微润滑条件下高速切削难加工材料,对硬质合金涂层刀具磨损形态、微观形貌进行对比分析,研究绿色制造工艺中低温冷风高速切削加工时硬质合金涂层刀具磨损机理。     

以车代磨加工复杂曲线旋压轮

随着我国新型硬质合金刀具材料的不断出现,使一些高强度、高硬度和高韧性的难切削材料能够以车代磨进行加工,使加工效率成倍或几十倍地提高。其重要意义还在于,使用这些新型硬质合金刀具车削,能比磨削更为     

钛合金盒体的数控加工工艺研究

针对钛合金材料的难加工特性、以及数控加工参数的选择等工艺难题,通过反复试验总结对数控加工参数、数控编程技术、刀具材料和参数进行优选,采用低转速、快速进给、小切削量和涂层硬质合金刀具的数控加工方法,达到零件的加工工艺要求.     

铌基合金切削加工过程中刀具优化研究

通过研究硬质合金和CBN刀具切削加工铌基合金材料过程中的加工性能,优化出适合铌基合金材料零部件超精密切削加工的刀具材料。通过硬质合金刀具在铌基合金材料切削加工过程中切削三要素(切削速度、进给量和切削深度)的正交切削加工试验,研究了其对切削加工表面粗糙度的影响,建立了硬质合金刀具切削加工铌基合金材料表面粗糙度预测模型,并利用AdvantEdge金属切削有限元仿真软件开展了切削工艺参数对切削加工过程的影响。     

铣削TC4钛合金的刀具磨损对比试验

TC4钛合金是典型难加工材料之一,极易造成工具磨损。本文通过铣削TC4钛合金试验,跟踪铣削过程中铣刀每个齿的磨损量及磨损形态,比较了不同细晶粒硬质合金铣刀的磨损过程。结果表明,铣刀切削刃发生崩刃会直接缩短铣刀的使用寿命。     

现代刀具材料系列讲座(十) 超硬刀具材料——金刚石与立方氮化硼

介绍了超硬刀具材料(金刚石与立方氮化硼)在加工不同工件材料时的切削数据。工件材料包括铜、铝合金和一些难加工材料。文中列出较多的试验数据和曲线,阐述了超硬刀具的切削性能和切削机理。     

现代刀具材料系列讲座（十一）超硬刀具材料—金则石与立方氮化硼

介绍了超硬刀具材料（金刚石与立方氮化硼）在加工不同工件材料时的切削数据。工件材料包括各种难加工材料与有色金属。文中列出较多的试验数据和曲线,阐述了超硬刀具的切削性能和切削机理。     

Damage of physical vapor deposition coatings of cutting tools during alloy 718 turning

Ni-based superalloys are typically difficult-to-cut materials. Therefore, the lifespan of cutting tools used to cut these materials is shorter than that of tools used on other materials. This study develops a new coating for cutting tools that has properties required for the turning of Ni-based superalloys. This study examined the cutting performance of TiN-coated cutting tools deposited by arc ion plating according to the damage of the coating and determination of the required properties of the coatings. To evaluate cutting tool damage, many analysis methods were used at each step of damage accumulation. Plastic deformation of the coating was observed at rake and flank face edges by scanning ion microscopy and transmission electron microscopy (TEM). Furthermore, the fracture of the coating near the surface defects (e.g., droplets, voids) was due to the interaction between the work material and surface defects. Moreover, using electron probe microanalysis, scanning auger microscopy, and TEM, the work material was confirmed to adhere to the cutting edge physically or mechanically, not chemically. This means that oxidation and diffusion did not occur in the interface between the adhesive material and coating after cutting. Finally, the effectiveness of different coating types, varying in both composition and deposition method, was verified by evaluating the effect of damage reduction. Using coatings with greater stability at high temperatures and fewer defects can reduce damage of the coated cutting tools, increasing tool lifespan.     

铣削ZGMn13高锰钢的刀具耐用度试验研究

采用多因素正交试验法,进行了硬质合金刀具（YT767）铣削ZGMn13高锰钢的耐用度试验。应用数理统计方法和回归分析原理,建立了铣削ZGMnl3高锰钢刀具的耐用度经验公式,研究了主轴转速、进给速度、切削深度、切削宽度对刀具耐用度的影响程度,给出了铣削ZGMn13高锰钢合理的切削参数范围。刀具耐用度分布符合正态分布,应用最大似然估计法对参数进行了点估计,并在置信水平为0．95时求出了参数的区间估计值,为研究ZGMn13高锰钢铣削刀具的可靠性奠定了基础。     

高速铣合金铸铁实验结果的稳健设计优化分析

针对高速切削新型合金铸铁类难加工材料时,因刀具磨损严重而导致刀具成本高的问题,采用成本较低的硬质合金刀具对Cr15Mo工件进行了铣削实验,研究了切削参数对切削力和表面粗糙度的影响,获得了可达到磨削加工效果（Ra=0.4 μm）的最佳参数组合,即切削速度vc=800 m/min,轴向切削深度ap=0.4 mm和进给量f=0.6 mm/r。基于稳健设计优化原理对实验结果进行了理论分析,研究结果表明：理论分析结果与实验结果具有很好的一致性,为同时实现高速、高质量和低成本加工的多目标参数优化方法提供了一种有效的途径。     

难加工材料高速铣削数据库系统的设计

根据难加工材料高速铣削加工的现状,通过用户需求分析,建立了基于C/S的难加工材料高速铣削数据库系统.该数据库可为工艺人员提供合理的难加工材料切削用量等信息,实现了切削参数的信息化管理,具有重要的实用价值.     

Simultaneous optimisation of multiple performance characteristics in micro-EDM drilling of titanium alloy

Micro-electrical discharge machining (micro-EDM) has become a widely accepted non-traditional material removal process for machining conductive and difficult-to-cut materials effectively and economically. Being a difficult-to-cut material, titanium alloy suffers poor machinability for most cutting processes, especially the drilling of micro-holes using traditional machining methods. Although EDM is suitable for machining titanium alloys, selection of machining parameters for higher machining rate and accuracy is a challenging task in machining micro-holes. In this study, an attempt has been made for simultaneous optimization of the process performances like, metal removal rate, tool wear rate and overcut based on Taguchi methodology. Thus, the optimal micro-EDM process parameter settings have been found out for a set of desired performances. The process parameters considered in the study were pulse-on time, frequency, voltage and current while tungsten carbide electrode was used as a tool. Verification experiments have been carried out and the results have been provided to illustrate the effectiveness of this approach.     

难加工材料枪钻加工技术研究

深孔加工是机械加工领域的重要分支,在钛合金、沉淀硬化不锈钢等难加工材料的深孔加工过程中,存在加工表面质量差、刀具崩刃、磨损严重和断屑排屑困难等问题。枪钻是深孔加工领域发展最早、应用范围最广的深孔加工刀具之一,其几何结构特殊,在深孔加工中具有加工质量好、效率高、直线度好等特点。本文介绍了枪钻的主要结构及受力情况,分析了枪钻的切削加工过程及其断屑条件,通过对切屑、切削力和切削温度的研究,得到了刀具、工艺参数以及切屑对加工质量和刀具磨损的影响规律。最后以两种典型的难加工材料为代表,分析了难加工材料深孔加工的特点。研究结果对难加工材料的枪钻深孔加工具有重要的指导意义。     

A study of the cutting-induced heating effect on the machined surface in ultra-precision raster milling of 6061 Al alloy

Ti-6Al-4V alloy is an attractive material in many industries due to its unique and excellent combination of strength to weight ratio and their resistance to corrosion. However, because of its low thermal conductivity and high chemical reactivity, Ti-6Al-4V alloy is generally classified as a difficult-to-cut material that can be characterized by low productivity and rapid tool wear rate even at conventional cutting speeds. It is well known that tool wear has a strong relationship with the cutting forces and a sound knowledge about correlation between cutting forces variation and tool wear propagation is vital to monitor and optimize the automatic manufacturing process. In the present study, high-speed end-milling of Ti-6Al-4V alloy with uncoated cemented tungsten carbide tools under dry cutting conditions is experimentally investigated. The main objective of this work is to analyze the tool wear and the cutting forces variation during high-speed end-milling Ti-6Al-4V alloy. The experimental results show that the major tool wear mechanisms in high-speed end-milling Ti-6Al-4V alloy with uncoated cemented tungsten carbide tools are adhesion and diffusion at the crater wear along with adhesion and abrasion at the flank wear. The cutting force component in the negative y-direction is more dominant of the three components and displays significantly higher magnitudes than that of the other two components in x- and z-directions. The variation of cutting force component F _y has a positive correlation with the tool wear propagation, which can be used as a tool wear indicator during automatic manufacturing process.