单面焊双面成形的质量控制

单面焊双面成形的焊接质量受焊接设备、焊材工艺流程、操作技术水平的影响。根据造成质量差的原因,提出相应的防止措施,对单面焊双面成形的操作具有指导作用。     

Effects and complications of placement of motility coupling post in porous polyethylene orbital implants

Objective: To investigate the effects and complications of primary and secondary placements of motility coupling post (MCP) in the unwrapped porous polyethylene orbital implant (PPOI) following enucleation. Methods: We investigated 198 patients who received PPOI implantation following the standard enucleation procedure in the First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China, from 2002 to 2004. These patients were subgrouped into PPOI-only patients (112 cases, received PPOI following enucleation), primary MCP patients (46 cases, received primary placement of MCP during PPOI operation), and secondary MCP patients (40 cases, received secondary placement of MCP 6 months after the initial surgery). Effects and complications among these three groups were compared. Results: The PPOI-only patients took shorter treatment course when compared with other two MCP groups (P<0.001), without significant difference noted between the two MCP groups. However, the two MCP groups had better prosthetic motility than PPOI-only group (P<0.001), without significant difference between the two MCP groups. In the early stage, 2 eyes in the PPOI-only group and 1 eye in the primary MCP group had PPOI infection. In PPOI-only group, 3 (2.68%) eyes had PPOI exposure, which occurred after fitting the prostheses; 4 eyes (8.70%) in primary MCP group and 1 eye (2.50%) in secondary MCP had PPOI exposure, which occurred before fitting the prostheses. After prosthesis was fit successfully, the excessive discharge and granuloma were 33.9% and 1.79% in PPOI group-only, 53.3% and 8.9% in primary MCP group, and 52.5% and 7.5% in secondary MCP group, respectively. Conclusion: Both primary and secondary placements of MCP into the PPOI following enucleation can help patients to obtain desirable prosthetic motility, but maybe associated with more complications. The primary placement of MCP with skilled operation in selected patients is more recommendable than secondary placement.     

整体式无心轴托辊塑性成形试验研究

在无心轴托辊旋压过程中,旋轮工作角、旋压温度、转速、进给率、旋压道次、缩径量等工艺参数的合理选择对旋压成形是十分重要的。本文采用三种不同工作角(20°、25°、30°)的旋轮进行了旋压试验,分析了各种工艺参数对无心轴托辊旋压成形的影响,其结论对无心轴托辊的实际生产起到指导作用。     

高罐身卷圆冲模设计的关键技术

本文通过对高罐身卷圆冲模的工艺分析及结构特点,阐述了高罐身卷圆工艺及模具设计的新思路,说明只有采用最合理而又灵活的模具结构,才能解决高罐身卷圆成形这一技术难题,并起到大大提高生产率,降低生产成本这一作用。     

基于RP的金属零件与金属模具的快速铸造

在日趋激烈的市场竞争中 ,时间就是机遇 ,时间就是市场 ,时间就是金钱 .能够将适合市场需求的创新设计率先转化成实实在在的商品 ,就能为抢占市场份额创造有利条件 ,快速成形技术结合铸造技术快速生产金属零件和金属模具 ,为企业参与市场竞争提供了有力的手段 .     

薄板冲压成形仿真有限元数值模拟

本运用计算机仿真软件包SHEET－FORMING对复杂薄板零件波纹成形过程进行数值模拟。本认为，运用高压橡皮成形工艺成形波纹板零件是可行的，预示了加载成形中毛坯变形过程和卸载回弹中成形件的回弹状态，为有限元数值模拟技术在高压橡皮成形工艺中的应用积累了有用数据。本所做的研究对实际生产具有指导作用。     

金属制坯技术中的金属体积成形工艺

通过对等温模锻、铸坯模锻以及半固态成形等体积成形工艺特点的分析,来阐述金属体积成形工艺在提高材料利用率,降低材料消耗,保持金属流线,改善机械零件力学性能,延长使用寿命等各方面的高质高效的特点     

以双锥辊轴向轧机轧制成形锥齿轮的实验研究

论述了锻造锥齿轮的现状，提出以双锥辊轴向轧机轧制成形代替一般锻压初锻造成形锥齿轮，降低了设备投资；介绍了双锥辊轴向轧机的原理、结构、基本技术参数和模具设计，进行了铅试件轧制成形实验研究，得到良好效果．     

一种CDMA正交自适应RAKE接收机

针对实际的CDMA无线通信系统,基于空域信号处理领域的Frost波束成形技术,设计了一种正交自适应Frost-RAKE接收机。与LMMSE算法相比,二者复杂度相当,但仿真结果表明,作者设计的Frost-RAKE接收机,其误码接收性能更为优越。同时Frost-RAKE接收机中引入了约束条件,避免了LMMSE算法的收敛慢、收敛步长不确定等问题,更易于在实际系统中应用。     

球面零件的拉延技术

在板料拉延工艺中．曲面形状零件的拉延是比较困难的，本文介绍了球面零件的拉延特征、拉延方法与防皱防裂措施，并给出两个实例。