数传控制装备可靠性预计

分析了某型数传控制装置可靠性模型,采用应力分析法对该装置进行了可靠性预计,根据设备实际状况求得其各主要部件的失效率,评估了产品的可靠性,从数据分析得出了影响可靠性的主要环节,提出了改进措施。通过可靠性试验,对可靠性预计值进行了验证。     

螺杆结构对一种改性双基推进剂代用料加工工艺的影响

选择螺杆压缩比(ε)、螺距(s)、螺杆头锥度(α)、螺杆直径(d)4种螺杆结构参数,通过四因素三水平的L9(34)正交设计,研究了其不同水平组合的螺杆结构参数对改性双基推进剂代用料安全加工、设备承载负荷、生产能力和物料可加工性的工艺影响.结果表明,对机头压力或扭矩的主要影响因素依次为B(螺矩)和D(螺杆直径);对出料速...     

合金元素对铬锰硅钢回火过程和组织的影响

本文以常用的30CrMnSiA钢为例,通过分析其淬火后在不同的温度进行回火的组织变化,研究了合金元素对铬锰硅钢回火过程和组织的影响。试验研究结果表明,合金元素对钢的回火过程和组织产生影响,加宽了回火温度范围,改变了组织形态,增加了钢的回火稳定性,使钢具有良好的综合力学性能。该研究有助于铬锰硅类钢的生产制造、选择应用和制定热处理工艺。     

复杂机械设备可靠性考核中的模糊综合评价法

本文介绍了从可靠性指标，可靠性考核等方面阐述了评价过程中的模糊因素，从而为亲搁的可靠性高度提供依据。     

浅谈企业内部质量审核的有效性

本文总结工厂多年实施内部质量审核的实践经验,从对审核过程管理、审核证据评价和审核结果处理几个主要环节入手,采取适宜的措施来提高内部质量审核的有效性。     

Mechanical behavior of the metal parts welded with extraterrestrial regolith simulant by the solar concentrator in ISRU & ISRF application

The use of in-situ resources plays an important role on future extraterrestrial human activities for the facility repair and habitat construction, especially in sustainable space exploration of Moon and Mars. A method of the metal welded with extraterrestrial regolith simulant using solar processing under ambient conditions is presented. Metal parts are made of Q235B ferroalloy and TA2 titanium alloy into standard tensile members according to the ASTM code. They are disconnected from the middle in advance, and then welded together with lunar and Martian regolith simulant under ambient conditions, respectively. The entire welding process and precautions are detailed. Additionally, the mechanical behavior of weldments is characterized regarding their tensile strength. Furthermore, the fusion zone of weldments is studied by Scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD) measurements. The results show that it is possible to weld metal parts together with extraterrestrial regolith simulant by the solar concentrator. The average ultimate tensile strength of ferroalloy specimens welded with lunar and Martian regolith simulant is 2.94 MPa and 1.66 MPa; The average ultimate tensile strength of titanium alloy specimens welded with lunar and Martian regolith simulant is 4.95 MPa and 2.59 MPa. Moreover, the failure mode of all weldments was brittle failure. The welding joints strength derives from the phases that the regolith as the solder fusing into ferroalloys in a homogeneous way and titanium alloys in an inhomogeneous way. The presented method may provide a new thought for astronaut assistance associating with repairing and fabricating in subsequent Moon and Mars missions.     

大型钛合金锻件的研制

本论述了生产大型钛合金锻件的工艺难点，并制定了用棒材生产大型钛合金锻件的技术协议及锻造工艺，使其力学性能达到了设计要求。     

印刷锡膏工艺参数的优化

印刷锡膏是表面组装生产中的第一道工序,也是最关键的工序,在表面组装生产中60％～70％的焊接缺陷与锡膏的印刷有关。本文将讨论与锡膏印刷有关的问题,包括锡膏参数和印刷机(特别是与刮刀有关的)参数,并对这些参数进行优化,以达到最好的锡膏涂布效果。     

提高CQFP封装器件加工的工艺可靠性试验

CQFP 封装器件已经应用于航天电子产品,但出现了引脚脱焊和断裂等问题。针对此类问题,文章对 CQFP 封装器件焊接、敷形涂覆和粘固进行了工艺研究,并进行了热真空、热循环、振动等可靠性试验进行验证,确定试验中的工艺方法可行、可靠,可以用于航天器的电子产品。     

双材料含桥联力Dugdale-Barenblatt模型的解析奇异单元

利用辛体系所提供的双材料楔形结合平面问题的解析辛本征展开通解与特解,构造出具有任意高阶精度的可用于双材料含桥联力Ⅰ型Dugdale-Barenblatt (D-B)模型界面裂纹分析的一类解析奇异单元.将奇异单元与常规单元相结合,就可有效地分析具有任意形状和荷载作用的含界面裂纹平面问题,并能方便地求解出界面D-B模型的塑...