1) drilling holes in thin plates
薄板钻孔
1.
The proltems that the holes drilled are lialle to he ollate and the drills are lialle to be troken while drilling holes in thin plates are analysed and proled in this paper,the mechanical conditions of the drill being forced is analysed,and also the improving process of drilling holes in thin plates is trought forward.
对薄板钻孔容易钻扁孔、钻头易折断的问题进行了探讨,分析了钻头的受力情况,并提出了薄板钻孔的改进办法。
2) template,drill
钻孔样板
5) perforated thin plates
多孔薄板
6) perforated thin plate
开孔薄板
1.
On the basis of the Kirchhoff-Karmhn hypothses for the nonlinear bendingof thin plates, the three kinds of boundary value problems of nonlinear analysis for perforated thin plates are presented under the.
本文提出了在任意中面边界条件下任意开孔薄板非线性分析的三类边值问题并建立了相应的广义变分原理。
补充资料:地表钻孔抽水
地表钻孔抽水
dewatering through well
d{bjoo之uankong ehoushu}地表钻孔抽水(dewatering through well)为了解除矿区地下水害威胁,在地表矿区边界之外的来水方向上围绕矿体开凿若干个大直径钻孔,在钻孔内安放深井泵或潜水泵排水,使矿区开采地段处于疏干降落漏斗水面之上的疏干方法。钻孔布置见矿山深井降水孔平面图。钻孔直径D可按公式D一d十50+2 了尸·、’· 户。’\。。/ 望‘,卜’。 户)’力价 /{/。一、\ 匕一办’\ 矿山深井降水孔的平面图 l一来水方向;2一抽水钻孔; 3矿区;4一隔水层(a十b)计算。其中d为水泵的最大外径,mm;。为过滤管的厚度,mm;b为充填料的厚度,mm。地表钻孔抽水疏干在地表进行,施工简单、方便,劳动条件好、施工管理容易,钻孔的布置及疏水设备的迁移都比较灵活。因此,在条件允许的情况下,应该尽量采用地表钻孔抽水,疏干矿床。 (张福有)
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