钛合金壳体件数控加工工艺研究

钛合金材料导热系数小、弹性模量低、化学活性高的特点,给机械加工带来很大难题。本文结合钛合金加工领域的相关技术资料和实际工作经验对钛合金壳体工件在加工中心加工工艺进行研究,着重介绍壳体工件加工中铣削、钻孔、扩孔工艺的研究。为在该领域的工作人员提供一定帮助。     

低熔点合金灌注在钛合金封装壳体加工中的应用

针对TC4钛合金封装壳体薄壁易变形的结构特点,提出了采用低熔点合金填充至壳体内腔的工艺方法,以提高零件的刚度,解决薄壁壳体机械加工时的变形问题。文中分析了钛合金封装壳体的加工工艺难点及可以采取的工艺措施,探讨了封装壳体加工对腔内灌注填充材料的要求,着重介绍了低熔点合金的材料特性、低熔点合金成分和成分选择.此外对介绍TC4钛合金封装壳体的加工工艺作了简要的介绍。     

大直径薄壁钛合金壳体加工技术

钛合金材料在航空航天中应用越来越广泛,受结构影响,薄壁钛合金壳体在机械加工中一直是一个比较棘手的问题.文中就一种典型的薄壁钛合金壳体的加工,从方案设计、定位装夹方法等几方面寻求解决途径,提高薄壁零件的加工精度.     

薄壁壳体加工技术及工艺研究

从工艺设计、加工阶段、装定位方式、切削刀具、切削用量等方面着手分析,结合薄壁壳体加工和钛合金材料加工经验,解决零件加工技术难点,保证零件所有尺寸技术要求。     

超细长小直径深孔的加工工艺研究

针对不锈钢及钛合金材料的超细长小直径深孔零件,从工件材料和切削性能以及小直径深孔零件的加工方法和刀具等几方面进行论述,并具体分析了两种零件的加工工艺过程及加工效果。     

内啮合式齿轮泵壳体加工工艺分析

以内啮合式齿轮泵为研究对象,内啮合式齿轮泵是壳体零件加工中较有代表性的一类,现以哈尔滨某机械制造集团公司研制的DA***型号的内啮合式齿轮泵为例,详细对壳体的功用、材料进行了描述和分析,在此基础上对壳体零件进行了技术要求分析和加工工艺性分析。合理制定壳体的加工工艺,在生产中很好地保证了加工精度,取得了较好的效益。     

钛合金精密零件镗铣加工工艺研究

基于当前钛合金材料的加工及发展状况,指出其加工过程中存在切削温度高、易发生质变、易变形、易发生过定位现象等问题,结合相关的加工工艺及过程对其流程进行优化,主要有选择合适刀具、进行合理恰当的切削、通过流程优化消除零件加工应力等,以提高钛合金加工的合格率,使零件尺寸精度达到要求.     

一种特殊钛合金零件的加工

以一种钛合金材料零件的加工为例,对钛合金材料导热性差,化学性能活跃及机械加工困难等特点,从加工方法的选择,加工工艺的制定,加工参数的选择方面入手,分析钛合金材料的加工原则,以及在不同加工方法下表现出的具体特点和所应采取工艺措施。     

钛合金精密零件镗铣加工工艺

对钛合金精密零件加工工艺技术的研究,通过选用适合加工钛合金材料的刀具、切削要素,提高钛合金精密零件加工质量,通过制定合理的热处理参数及工艺流程消除零件加工应力,稳定零件加工尺寸,选用合适的定位方式消除零件的加工过定位,保证零件加工尺寸精度,试验表明此工艺加工方法可消除零件加工变形,稳定加工尺寸,使钛合金精密零件合格率达到95%以上,从而达到保证零件尺寸精度的技术要求。     

钛合金支架零件工艺解决方案

正钛合金材料由于强度好,重量轻的特点,广泛应用于航空、航天和兵器行业,但是钛合金导热系数低、塑性低、弹性模量低和弹性变形大等特点,造成切削性能差,加工变形不易消除,高精度的零件关键尺寸不易保证。本文通过分析钛合金薄壁支架零件的加工,成功解决变形问题来探讨钛合金的特点。1.钛合金支架加工工艺分析(1)用附图所示零件展开工艺分析。     

振动钻削技术在深小微孔加工中的应用

介绍了振动钻削工艺及装备的国内外研究现状及趋势,为钦合金、高温合金、不锈钢等难加工材料的深小微孔加工提供一定的参考依据.     

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.     

方舱用铝合金板材生产工艺研究

随着方舱和车载电子设备轻量化设计的要求,对铝合金结构件的使用日益增多,其工程设计要求也不尽相同。通过对车载方舱使用的各种铝合金板材的理化性能比较,从工艺设计角度为设计人员在满足各种设计要求的选材上,提供了优选依据。     

Drilling experiments on a gamma titanium aluminide obtained via electron beam melting

Gamma titanium aluminides are intermetallic structural alloys with many advantages like high temperature and oxidation resistance, low density, high specific strength, rigidity, etc. This makes them promising candidates for critical applications where both mechanical and thermal properties are required. Unfortunately, their machinability is demanding, generating low cutting life and poor surface conditions. A deeper knowledge on the machining parameters is essential for a wider application of these heat-resistant light-weight alloys in aircraft and automotive industry. In this paper, the performance of uncoated carbide drills in drilling a gamma titanium aluminide was analysed. The workpiece material was obtained via electron beam melting (EBM) process, a versatile technology for additive manufacturing of complex metal parts from metal powders. EBM is highly appealing in the field of aeroengine components, and it is particularly interesting in processing gamma titanium aluminides. Cutting performances were measured in terms of tool wear, surface roughness, dimensional and geometric errors. The experimental results show strong dependence of tool wear and part quality on cutting parameters, with poor tool life compared with other work materials.     

钛合金复杂构件等温锻造实验研究

钛合金复杂构件通常采用机加工成形,导致成本高、材料利用率低,而且常规的锻造工艺很难满足外形复杂、使用性能要求高的钛合金复杂构件成形过程。提出钛合金复杂构件的新工艺,即先等温锻造成复杂构件形状,然后辅以机械加工的方法成形;通过实验研究,结合力学性能测试和超声波探伤,提出非对称变截面钛合金复杂构件等温锻造成形工艺。实验结果表明,采用该等温锻造成形工艺获得的钛合金复杂构件完全满足系统要求,并可替代机械加工产品;按新工艺加工成形的某钛合金复杂构件,不但降低成本,缩短机加工时间,而且材料利用率也提高到60%以上。     

Assessment of the machinability of Ti-6Al-4V alloy using the wear map approach

The high strength to density ratio of titanium alloys coupled with excellent corrosion resistance even at elevated temperatures make them ideal for aerospace applications. Moreover, the biocompatibility of titanium also enables its widespread use in the biomedical and food processing industries. However, the difficulty in machining titanium and its alloys along with the high cost of its extraction from ore form presents a major economic constraint. In the context of machining economics, the wear map approach is very useful in identifying the most suitable machining parameters over a feedrate–cutting velocity plane. To date, wear maps have only been prepared for the machining of ferrous alloys. In this article, a review of the machinability of Ti-6Al-4V alloy is presented with emphasis on comparing the wear performance of various tool materials. In addition, a new wear map for Ti-6Al-4V alloy is presented based on unified turning tests using H13A grade carbide inserts. This wear map can be used as a guide in the selection of cutting variables that ensure the least tool wear rates. This article contrasts the occurrence of a safety zone in the case of machining steels to that of an avoidance zone for Ti-6Al-4V alloy.     

钛及钛合金的表面渗氧强化技术

钛及钛合金具有比强度高、耐蚀性好、良好的高温性及生物相容性等优点,是新兴的结构和功能材料,但由于其表面耐疲劳和耐磨损性能差等缺点使其应用受到限制。表面渗氧强化技术是提高钛合金表面性能的一种有效手段,本文综合评述了表面渗氧技术在钛及钛合金中的应用现状及研究进展。     

Deformability and microhardness of large-grain titanium alloys in rolling with pulsed current

The influence of pulsed current on the deformability and microhardness of large-grain VT1-0, VT6, and TiNi titanium alloys is considered. Electroplastic rolling is shown to reduce the strain hardening of the alloys and to increase the deformability of VT6 and TiNi alloys. The alloy deformability increases with increase in current density and pulse length. The proposed method may be used to produce long titanium components with a thin cross section.     

Removal of alpha case on titanium alloy surfaces using chemical milling

Elevated temperature deformation processing of titanium such as during forging causes the formation of alpha case, a brittle layer on the processed components. Alpha case removal has been attempted by several methods, however, in-depth understanding of chemical milling to this end is not evident from the prevailing literature. This work therefore undertakes experimental analysis of chemical milling to remove alpha case generated on titanium alloys after deformation after forging. Several compositions of chemicals and heat treatment conditions for titanium work-material were evolved. Effectiveness of these methods and their applications in removing alpha case on forged titanium alloy were investigated by performing a series of experiments. After the alpha case removal, the titanium work surfaces were examined using optical and scanning electron microscopy as well as electron back scattered diffraction and X-ray diffraction. The optimum results achieved show that 8% HF and 10% HNO₃ solution with 13 min and 30-s etching time is more effective in completely removing alpha case layer by chemical etching of Ti-6Al-4V alloy work specimens heated in air at 930°C.