Abstract : by means of metallographical examination and sem, the microstructure characteristics, macro - and microfractographs of the brittle broken wheel hull bolt of bj212 automobile have been studied. the results show that the thin - headed screw, with excessively deep carbonitriding layer and hardening layer, has less resistance to brittle fracture in the thin area of its head. at the root of the head connecting the stem, a tensile stress may emerge owing to the non - even quenching stress. those are the two reasons for low torque fracture of bolt
文摘:藉助金相、掃描電鏡等手段對低扭矩脆斷的bj212汽車輪殼螺
栓的金相組織特徵,宏觀和微觀斷口形貌等進行了研究,結果表明:這種頭部薄的螺
栓,滲層和淬透層過深,使頭部薄區脆斷抗力降低,在頭部與桿的根部,由於淬火應力不均勻導致根部產生
拉應力,均是導致螺
栓低扭矩斷裂的原因。
Direct tension indicators - specification for nut face and bolt face washers
直接
拉力指示器.螺母面和螺
栓面墊圈規范
Under the regulations, a hose reel system is required for every 30 m ; fire hydrants must be installed at staircases where fire hoses can be pulled out for use ; firemen should be provided with easy access to the fire scene, such as a lift that reaches the top floors within one minute ; there should be designated floors in high - rise buildings for occupants to take refuge, for instance, the provision of one such refuge floor for every 20 floors or so, in order to curb the spread of fire
根據規定,每30米須設有消防喉轆在梯間須有消防
栓,可以
拉出水喉應用亦須有地方讓消防員容易進入火場,例如可在1分鐘內到達頂樓的消防電梯高層大廈還須有避難層的設施,例如每二十多層便有一層避難層,令火勢不容易擴散。
Standard test method for rock bolt anchor pull test
石
栓錨定
拉力試驗的標準試驗方法
No ; it was st. john rivers, who, lifting the latch, came in out of the frozen hurricane - the howling darkness - and stood before me : the cloak that covered his tall figure all white as a glacier
不,是聖.約翰.里弗斯先生,從天寒地凍的暴風雪中,從怒吼著的黑暗中走出來,
拉開門
栓,站有我面前。
Specializing in the production of jack, hydraulic wrench, hydraulic nuts, bolts hydraulic tensile, snorkel platform groove machine, demolition broken clamp, the manual hydraulic pump, electric and pneumatic hydraulic pumps and other hydraulic pump
專業生產千斤頂、液壓扳手、液壓螺母、螺
栓拉伸器、液壓升降平臺、坡口機、拆破鉗、手動液壓泵、電動液壓泵和氣動液壓泵等。
Railway fixed equipment. rail screw - bolts
鐵路固定設備.鋼軌用
拉緊螺
栓
Steel construction. joint with controlled tightening bolts. installation schedule
金屬結構.可控
拉緊螺
栓連接.螺
栓安裝程序
Central tension bolt
中心
拉緊螺
栓
Metal construction. jointing by means of bolts with controlled tightening. execution of joints
金屬結構.可控
拉緊螺
栓連接.連接施工
Metal construction. jointing by means of bolts with controlled tightening. calibration of torque wrenches
金屬結構.可控
拉緊螺
栓連接.扭力扳手校準
Metal construction. jointing by means of bolts with controlled tightening. fabrication and preparation of joints
金屬結構.可控
拉緊螺
栓連接.連接件製造和準備
Metal construction. jointing by means of bolts with controlled tightening. methods of tightening and checking of bolts
金屬結構.可控
拉緊螺
栓連接.螺
栓拉緊和檢驗方法
Metal construction. jointing by means of bolts with controlled tightening. structures requirements and checking of jointing
金屬結構.可控拉緊螺栓連接.構造規定和螺栓計算