深型腔加工中刀具碰撞和避空问题的研究

针对深型腔模具加工中刀具、夹持的碰撞及其避空问题,通过利用PowerMILL编程软件的刀杆、刀柄碰撞检查,可以避免刀具碰撞现象的发生,同时,设置合理刀具避空,可以充分利用刀具,提高模具的加工精度。     

钻井泵中心拉杆密封装置的结构改进

针对钻井泵中心拉杆原有密封装置结构易失效的问题,通过改进结构,增加浮动套机构,减少磨损,延长了密封圈的使用寿命。     

玉门油田酒东地区套管损坏机理研究

针对玉门油田酒东地区套管损坏发生的经过,重点开展了地应力研究、中沟组地层泥岩强度特性研究,进行了岩心强度和蠕变实验,最终分析总结出酒东地区套管损坏的详细原因。根据套管损坏机理研究情况,制定了有效预防套管损坏的技术对策。通过长3井全过程的试验与应用,验证了套管损坏机理研究的正确性和预防对策的科学性,为该地区后续勘探开发提供了保障套管安全的有效措施。     

铝锂合金的温热拉深成形性能

在数值模拟研究压边力、毛料直径、凸凹模圆角半径、变形温度等对5A90铝锂合金板材拉深成形影响的基础上,采用正交试验设计方法对拉深成形工艺参数进行优化设计,并进行相应的拉深成形试验。研究表明,变形温度对拉深成形影响最显著,其次是毛料大小的影响,而变形速度和压边力的大小对拉深成形影响较小。通过对试验结果的计算、分析和总结,获得了5A90铝锂合金板材拉深成形的最佳工艺参数组合,在最佳工艺参数条件下,铝锂合金的极限拉深系数达到了0.45。     

纯钛板材冷拉深成形过程中的组织与性能

纯钛板材冷拉深成形困难,组织与力学性能变化显著。文章以TA2纯钛半球形曲面件冷拉深成形为对象,研究该成形过程中材料的微观组织与力学性能变化,分析拉深变形特点与微观组织、力学性能的关系,并进一步研究改善拉深件后续塑性变形能力的热处理方法。结果表明,拉深件不同区域微观组织及力学性能存在差异:变形量越大,形变孪晶越多,组织形貌越复杂,强度越高,塑性越低。退火可以有效地改善其组织及力学性能,退火温度对微观组织均匀性和晶粒大小有显著的影响。     

工程陶瓷材料磨削加工技术

概述了近年来国内外工程陶瓷磨削加工技术的研究进展，对高速深切磨削、超声波辅助磨削、激光预热辅助磨削、延性域磨削、在线电解修锐、电解间隙修锐磨削等几种典型的磨削加工技术的特点及最新进展进行了分析评述；提出了非导电陶瓷双电极同步伺服跟踪电火花磨削加工工艺，并介绍了其磨削加工特点及关键技术，最后指出了今后的发展及研究方向。     

低功耗家电深沟球轴承的设计分析

基于绿色设计理念，运用优化设计理论对某家用电器轴承进行了多目标优化设计和取值分析，结果表明，新结构轴承具有轴承摩擦力矩低、发热小、使用寿命长的特点。     

隐身罩拉深模设计

分析了隐身罩零件的结构和工艺特点,改变了组焊式的制造方法,有针对性地制定了模具设计制造工艺方案,简化了设计结构,并以DYNAFORM软件进行了设计计算及模拟。结果表明,提高了模具设计制造效率及准确性,满足了批量生产,且提高了外观质量。     

Frying performance of low-linolenic acid soybean oil

The frying performance of low-linolenic acid soybean oil from genetically modified soybeans was examined. Partially hydrogenated and unhydrogenated low-linolenic acid soybean oils were compared to two partially hydrogenated soybean frying oils. Frying experiments utilizing shoestring potatoes and fish nuggets were conducted. Frying oil performance was evaluated by measuring free fatty acid content, p-anisidine value, polar compound content, soap value, maximal foam height, polymeric material content, and Lovibond red color. The hydrogenated low-linolenic soybean oil (Hyd-LoLn) consistently had greater (P<0.05) free fatty acid content and lower p-anisidine values and polymeric material content than did the other oils. Hyd-LoLn generally was not significantly different from the traditional oils for polar content, maximal foam height, and Lovibond red color. The low-linolenic acid soybean oil (LoLn) tended to have lower soap values and Lovibond red color scores than did the other oils. LoLn had consistently higher (P<0.05) p-anisidine values and polymeric material content than did the other oils, and LoLn generally was not different (P<0.05) from the traditional oils for polar content, maximal foam height, and free fatty acid.     

Submarine mine tailings management

The placement of mine tailings at depth in the marine environment is reviewed. This review considers first the engineering aspects of a pipeline system which transports tailings slurry from a process plant to the coast and then to a location at a depth of typically 200 m on the continental slope. Next, the fluid dynamic behaviour of the tailings, once discharged from the end of the pipe, are discussed, and a numerical model is presented which simulates the fate of both the dissolved and solids component of the tailings slurry in the marine environment. This latter model can be used to estimate the environmental impact of a proposed deep sea tailings placement system.