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cold shut
    CRITERION FOR PREDICTING COLD SHUT MARK
    冷隔缺陷预测判据
    The defects including surface crack, cold shut and surface splinter on alloy ingot were eliminated.
    解决了合金生产中铸锭表面裂纹、冷隔、起刺等难题 ,实现了大批量提供盘管所用的ACR管材铸锭
    the mould temperature should be controlled about at 450 ℃, and when the temperature of the mould is too low, the casting is apt to present the deficiency of cold shut and crack.
    浇注时模温要控制在450℃左右,模具温度太低铸件容易出现冷隔和裂纹等缺陷;
    Based on the expericnce from production for years , the investigations were carried out to prevent ZG25 Mn Cr4 type cast steel casting from surface fold and cold shut, which were caused by poor fluidity owing to the oxidation of Mn and Cr in the melt. It is evident that the cast defects mentioned above can be effectively eliminated by close controling the casting prosess parameters.
    本文通过试验表明,严格控制铸造过程中的一些工艺参数,能有效地防止ZG25Mn18Cr4钢铸件表面产生皱纹、冷隔缺陷。
    Using Volume of Fluid(VOF)method,combining the fluid flow and heat transfer, the computor simulates not only the two dementionalvelocity field and temeprature field, but also the flowing stoping process,providing the theory ofpredicting and preventing defacts such as shot run, cold shut and so on.
    采用体积函数法(VOF法),将流场和温度场耦合计算,不仅模拟了二维速度场和温度场,而且模拟了流动停止过程,为预测和防止冷隔、浇不足等缺陷提供了理论依据。
    Using the numerical simulation,the location of cold shut can be predicted and the optimum design of EPC process achieved.
    通过模拟计算可预测冷隔产生位置,实现消失模铸造工艺优化设计。
    The criterion which could predict the occurrence of cold shut mark on sUS304 stainless steel during twin roll casting process was determined by combining numerical simulation with test observation. The criterion was tested and verified by experimental results, and was showed correct and reliable.
    采用数值模拟与试验观察相结合方法确立双辊铸造SUS304不锈钢薄带出现冷隔缺陷的预测判据,并用试验结果对该判据进行考核和验证,结果判据可靠、准确。
    Then, the limit speeds of cast drawing were calculated according to the main technical defects, i.e. the cold shut and the solid break, the calculation value corresponded with the measured results.
    然后根据限制铸拉速度的主要缺陷,即凝固壳断裂和冷隔,通过计算铸件截面承受的摩擦力、热应力和液穴形状,得到了铸拉工艺的极限速度,计算值与实测值吻合。
    The results showed the applied pressure is beneficial to eliminate grainy surface and cold shut because of improving filling ability.
    加压后提高了铝液充型能力 ,有利于消除铸件表面的颗粒状和冷隔 ;
    In the paper the author analyses the causes to the defects of gas porosity,loose,cold shut and shrinkage cavity in cylinder casting of YC6108 diesel engine. Countermeasures are proposed.
    针对 YC6 1 0 8柴油机缸体铸件出现批量气孔、疏松、冷隔、缩孔的现象 ,结合生产过程 ,分析了导致缺陷的原因 ,提出了相应的对策。
    The lower specific pressure and delay pressurization in time during casting process were responsible for surface blister and cold shut of motor cycle wheel in squeezing casting.
    分析了实际铸造比压偏小以及不能瞬间及时增压是造成摩托车车轮挤压铸件表面起泡和冷隔的主要原因。
    Otherwise, defects such as cold shut,misrun,porosity,conclusion have been prevented,meanwhile,defects of the shrinkage and porosity located at the hot spot,root of riser have been eliminated by means of gating and feeding system, techniques of chill and over flow riser.
    通过强化浇注系统充填与补缩 ,并配合冷铁、溢流技术防止铸件冷隔、浇不足、气孔、夹渣等充填性缺陷 ,消除铸件热节、浇口根、冒口根的缩孔、缩松等收缩缺陷
    the surface of the ingots of LFEC has no cold shut and less segregation.
    锭坯表面无冷隔和少偏析瘤 ;
    Simulation results show a smooth filling, uniform temperature distribution and few flaws such as gas inclusion and cold shut. A casting with a good quality was obtained.
    模拟结果表明,该浇注系统填充过程平稳,温度场分布均匀,所得压铸件气体夹杂和冷隔缺陷少,整体质量较高.
    by coupling simulation of fluid field and temperature field, the location and cause of the defects such as misrun ,cold shut ,material property are exposed.
    通过对流动场温度场的耦合计算 ,揭示了铸件产生冷隔浇不足、材质等缺陷的部位与形成原因。
    The experimental results indicated that the new LFC technology can siginificantly improve the filling ability of the Mg alloy,eliminate the misrun and cold shut appeared in the Mg castings in gravity LFC process.
    试验研究表明 ,这种新的消失模铸造工艺大大提高了镁合金的充型能力 ,消除了重力下消失模铸造镁合金充型能力差、易形成浇不足和冷隔缺陷的缺点。
    Simulated results show that obtained parts has few defects,such as inclusion and cold shut due to smooth mold filling and uniform distribution of temperature field.
    模拟结果表明,该浇注系统填充过程平稳,温度场分布均匀,所得压铸件气体夹杂和冷隔缺陷少,整体质量较高。
    Using the technology,not only the impurities,gas hole and inclusion-slag can be obviously decreased but also the misrun and cold shut were reduced due to the improvement of purity of liquid alloy resulting in the good fluidity.
    使用该技术后,熔炼过程无须熔剂覆盖和脱氧,不仅非金属夹杂物、气体夹渣等铸造缺陷大为减少,而且由于合金液纯净度提高,流动性也有所改善,浇不足、冷隔等缺陷随之减少。
    A Comparison between vertical moulding-vertical pouring method and the horizontal moulding-horizontal pouring method for the automobile reductor sub-housing castings was made,and it was pointed that the latter method has following advantage:less machining allowance,better casting surface quality,favourable to reduce blowhole,misrun,cold shut,low sand/iron ratio,high process yield rate,and the qualified rate being increased by more than 15%.
    对4QZ、5QZ汽车减速器副箱体铸件立做立浇与平做平浇两种铸造工艺方案进行对比,指出后者的优点是:可以减少加工余量、提高铸件表面质量,有利于减少气孔、浇不足、冷隔缺陷,砂铁比低,工艺出品率高,铸件合格率提高15%以上。
    The success of casting motor shell and window pattern demonstrates the new technology can greatly improve the filling ability of the magnesium alloy,consequently eliminates the misrun and cold shut in gravity LFC process.
    窗体和电机壳体成功浇注试验证明了真空低压消失模铸造新工艺大大提高了镁合金的充型能力,消除了重力下消失模铸造镁合金充型能力差、易形成浇不足和冷隔缺陷的缺点。
 

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