1) preforming
预压成形
1.
Effect of pressing pressure,preforming and pressing mode on structure and properties of bonded NdFeB magnet were investigated.
本文研究了压制压强、预压成形和压制方式等对粘结NdFeB磁体结构和磁性能的影响及机理。
2) pre-compression
预压
3) Prepressing
预压
1.
Study on Spring back of Particleboard Mat after Prepressing;
刨花板板坯预压回弹率的研究
2.
Analysis of prepressing contact in aluminium alloy resistance spot welding;
铝合金点焊预压接触分析
3.
Since many plywood enterprises are faced with the prepressing problem of plywood,a series of designedorthogonal plywood prepressing experiments with several main factors influencing plywood prepressing property were made;the experiment results were analyzed and the most important factor influencing plywood preressing was found.
胶合板预压是目前许多胶合板企业所面临的问题,为此从影响胶合板板坯预压性能的几个因素入手,通过正交试验和对结果进行直观分析,找到了影响胶合板预压性能的主导因素,为后续解决快速预压问题做了必要的准备。
4) preloading
预压
1.
Calculations of soft foundation treatment sedimentation by vacuum preloading method;
真空预压软基处理沉降计算
2.
In combination with the preloading engineering of an expressway by vacuum preloading combined with loading preconsolication, this paper analyzes the consolidation mechanism of vacuum preloading, discusses the construction factors influencing the effect of vacuum preloading consolidation, and points out common troubles and removing methods.
结合某高速公路的真空联合堆载预压工程,分析了真空预压的加固机理,讨论了影响真空?预压加固效果的施工因素,指出了常见故障及其排除方法。
5) precompression
预压
1.
Experimental analysis on effect of treatment of soft foundation with vacuum-accumulation loads combined with precompression technique;
真空-堆载联合预压处理软基效果的室内试验研究
6) preload
预压
1.
The results showed that the second value of the honeycomb cardboard may not get the peak value as the first time does, and directly enters the yield stage, thus makes that its stiffness less and the cushion is better than unpreload.
通过压缩试验,研究了预压缩之后蜂窝纸板二次加载时的缓冲性能,并与首次加载时的缓冲性能进行对比分析,结果表明蜂窝纸板预压之后二次加载时没有首次加载时的峰值,直接进入屈服平台,其弹性阶段刚度小于首次加载,缓冲性能优于未预压的蜂窝纸板。
2.
The water-filled preload method can be used to come up to reinforce the foundation, reduce the settlement and lower the cost effectively.
软弱非饱和土地基 ,常采用复合地基加固 ,但费用较高 ,采用充水预压加固可达到提高地基强度、减少工后沉降的目的 ,并可有效降低工程造价。
3.
The quantitative relationship of the forecast to differential settlement of annular wall foundation of controlled water tests to preload large oil tanks is reserched and expounded briefly.
对大型油罐软弱地基充水预压试验中环墙基础不均匀沉降预测的定量关系作研究和简述 ;根据实测沉降资料 ,采用回归分析 ,提出了预测关系式 ,并对预测的主要影响因素作了具体分析。
参考词条
补充资料:主要射出成形材料成形时应注意事项
■主要射出成形材料成形时应注意事项
品 名 注 意 事 项
PVC
聚氯乙烯
1. 产品种类范围非常广(硬质、软质、聚合物等),成型条件各有不同,从熔融至分
解之温度范围很小,尤须注意加热温度。
2. 附着水分少,但成型周期尽可能减少(50℃~60℃热风干燥)。
3. 成型机方面,与材料直接接触的部位须电镀或采用不锈钢以防热分解所产生的盐酸
侵蚀。射出压力2100kg/cm2程度。
4. 所有塑料当中必须是细心注意温度调节。
5. 浇口附近易产生流纹,故射出操作后,柱塞不要后退使浇口充分固化后再瞬间退后为宜。
6. 加热之初温不宜高,特别注意熔融情形。第二级加热温度较高,且尽可能使成形周
期缩短,比较安全。
PA
聚醯胺树脂
1. 成型温度比其它材料高,故采用油加热的成形机较适当。
2. 吸湿性大,必须充分干燥。水分对成型品的品质影响甚大(80℃热风干燥约5~6小时)。
3. 须退火以消除内部歪斜。
PP
聚丙烯
1. 同PE,但成形温度必须较高。熔融温度170℃,超过190℃则流动性大增,则毛边增加,
易产生接缝及凹入情形。
PC
聚碳酸脂
1. 吸湿性比尼龙小,但若有些微之水分存在则成型品产生其它色泽或气泡,故必须密封
干燥同时成形时也须预备干燥(120℃之温度4小时)。
2. 加热温度超过320℃时则产生热分解,成品变色,故特别注意温度调节,又成型时的温度调节也非常重要,须特别注意其最低温度、最低时间。
3. 须退火以消除内部歪斜(130℃~135℃,1小时程度为准)。
说明:补充资料仅用于学习参考,请勿用于其它任何用途。