Reason analysis of the support frame casting in situ crack of block 0 of a PC cable-stayed bridge 某PC斜拉桥0号块支架现浇开裂原因分析
An available chamber design is presented to prevent squeezing casting from creation of shrinkage crack and shrinkage hole as well as to elevate specific pressure. 为防止挤压铸造铸件缩裂、缩孔产生和提高铸造比压,推荐一种合理料缸(压室)设计。
From quality of melting metal, casting condition and casting equipment, the influence factors of crack in aluminium and its alloy slab ingot were analyzed, some suggestion have been drawn out. 从铝及铝合金的熔体质量、铸造条件和铸造设备三个方面,分析了对铝及铝合金扁锭裂纹影响的诸要素,并提出避免裂纹的措施。
Appearance and preventing measures for big blank cap casting crack at Ore-dressing Plant 选矿厂大端盖铸造裂纹的产生及预防
Casting Crack of Gear box-body and Its Elimination 变速箱体铸造裂纹及消除措施
Because of strengthening rib is not to simultaneous coagulating with thin wall position of casting steel piece, the strengthening rib root of reducer case made from casting steel is easily to produce hot crack. 铸钢减速机壳体加强筋根部易产生热裂纹,其原因是加强筋与薄壁处不能同时凝固。
Casting speed is more rapid and the crack-producing trend is more distinct. 拉坯速度越快,裂纹形成趋势越明显;
The surface temperature model of the casting without surface crack is obtained as follows: the surface temperature decreases slowly and is corrected over 900 degrees, the upper temperature limit in lower plasticity temperature zone. 得到无表面裂纹的铸坯表面温度模型为:表面温度为缓慢下降过程,并在低塑性温区的上限温度900℃进行矫直。
The influence of cast technology on casting crack is studied by computer analogy. 并用计算机数值模拟的方法研究了铸造工艺对铸件裂纹产生的影响。实践表明,严格控制铸件化学成分,特别是S、P含量;
Producing Cause and Countermeasure of Casting Crack of Reducer Case Made From Casting Steel Foundry Method of Nodular Iron Front Wheel Boss and Differential Mechanism Case 铸钢减速机壳体铸造裂纹的产生原因及防止方法球铁前轮毂和差速器壳体铸造工艺
Influence of Casting Technology on Slab Crack and Protective Measures 连铸工艺对板坯裂纹的影响及防止措施
Original production process, the main casting defects and caues of hot crack in wheel production are summarized. 简要介绍了原车轮生产工艺,主要铸造缺陷及热裂产生;
From aspects of the converter molten steel, technological parameter, technological operation and continuous casting equipments, the cause of crack in billet triangular area is analysed and the control measures put forth. 从转炉钢水、工艺参数、工艺操作和连铸设备等方面,分析了影响板坯三角区裂纹的原因并提出控制措施。
Effect of Pouring Temperature on Investment Casting Crack 浇注温度与熔模铸件裂纹
Some technical problems in the bimetal casting of large electroforming sheathing are discussed, and some effective measures for preventing casting crack and distortion in cast are proposed. The application of electroforming die will be extended. 论述了大型电铸壳体双金属铸造中的一些技术问题,以及防止铸件产生裂纹、变形等缺陷所采取的有效措施。
Take the steel castings as an example, about 20% of the total casting rejects are due to the heat crack defects. 仅就铸钢件而言,据统计,由于热裂纹造成的废品约占废品总数的20%以上。
Through taking decreasing pouring temperature used of external chill of plate type, taking 70 core and reasonable arrangement of pouring system the question of casting crack can be salved effectively. 为此,利用板形外冷铁降低浇注温度,采用70砂制芯及合理布置浇注系统,有效地解决了铸造裂纹问题。
Basic Study on Large Size Cement Concrete Structure Casting Temperature Crack Prevention and Control 大体积水泥混凝土结构浇注施工温度裂缝防控初探
The methods about controlling alloy components and increasing melt purity were presented. The methods of preventing casting crack were presented. 提出了控制合金成分、提高金属纯洁度的方法,重点提出了解决扁铸锭裂纹的措施。
The unstable change of mould taper during casting and the trigonal area crack of slab are main problems of new No. 3 caster. 武钢新3铸机在浇注过程中存在结晶器锥度不稳定、板坯三角区裂纹等主要问题。
By setting supplemental allowance at arc wall to increase the round corner radius of inner flange of the open hole, the casting crack was completely eliminated. 有针对性地设置圆弧壁补贴,加大敞开口内法兰边的圆角尺寸,完全消除了铸件裂纹。
The casting fluidity, ratio of line contraction, casting stress and heat crack tendency were tested. The factors of influence casting properties were also analyzed. 测试了Al3Ti/ZL101原位复合材料的流动性、线收缩率、热裂倾向及铸造应力,分析了影响铸造性能的各种因素。
This paper analyzes the effects of Mn/ S, S and P contents, casting speed and secondary cooling on centreline crack in the web of beam blank, and puts forward the improving measure. 通过现场调研和工艺参数统计,分析Mn/S、S、P、拉速和连铸二冷设备等对异型坯腹板中心裂纹的影响,在此基础上提出改进建议。
Further calculation shows that as the casting speed increases, crack formation decreases and the casting speed temperature effect. 拉速增加,裂纹形成机率减少,浇注温度对裂纹的影响不显著。
Removing of Casting Crack on Hub with RE 加入稀土消除铸造轮毂的裂纹
The results show that main cause of conchoidal fracture forming is that composition segregation in solidification grain boundary of casting steel reduces the resistance of crack propagation. 结果表明,沿一次晶晶界的成分偏析对裂纹扩展阻力的降低作用是铸钢中贝壳状断口形成的主要原因。
The fatigue behaviour of the Al 2O 3 · SiO 2 fibre reinforced aluminum matrix composites produced by the squeeze casting method was investigated. The fatigue crack initiation and propagation were observed by SEM. 采用压力铸造法,制得Al2O3SiO2短纤维增强的铝合金复合材料,对其弯曲疲劳性能进行了测试,并详细观察了疲劳裂纹的形成及扩展方式。
Massive concrete structure is the important structure form of water conservancy project, however, concrete material can resist huge pressure but small tensile stress and causes large amount of heat after casting, which result in the destructive crack of structure easily. 大体积混凝土结构是水利工程的重要结构形式,然而,由于混凝土材料耐压不耐拉、浇筑后产生大量热量等特点,致使结构容易产生破坏性裂缝。