共查询到20条相似文献,搜索用时 15 毫秒
1.
2.
对某商用车前接梁样件采用ProCAST数值模拟技术辅助分析铸造工艺设计可靠性,确保样件制造的一次合格率;通过选择性激光烧结技术(SLS),以聚苯乙烯为原料打印模样,再进行熔模铸造工艺生产,最终获得符合尺寸和精度要求的样品. 相似文献
3.
赵有伟;赵毅红;郑志伟;郝维进;姜苗苗;陈倩钰 《特种铸造及有色合金》2016,36(11):1160-1162
大型铝合金罐体由于体积大、结构复杂、凝固时间长,浇注时容易出现缩孔、缩松等缺陷。通过ProCAST软件对罐体铸造过程流场和温度场进行模拟分析,预测缺陷形成的区域。根据模拟结果,在产生缺陷区域安放冷铁能起到强制冷却作用,改善了铸件的温度场,使铸件符合顺序凝固的原则,有效地消除了铸件的缩松缺陷,经X射线检测合格。 相似文献
4.
5.
6.
C.H. KonradM. Brunner K. KyrgyzbaevR. Völkl U. Glatzel 《Journal of Materials Processing Technology》2011,211(2):181-186
Investment casting molds with different numbers of shells and pre-heating temperatures were investigated in this study. The primary layer consists of colloidal silica bound ZrSiO4 with additions of CoAl2O4 to achieve fine grains and to reach a good surface quality, whereas the following layers consist of mullite bound by colloidal silica. Interface temperatures (alloy/mold) that are necessary to determine heat transfer coefficients were obtained by linear extrapolation. Heat transfer coefficients in the range of 300-660 W/(m2 K) were obtained. The castings were examined with regard to grain size and secondary dendrite arm spacing. Physical properties of the investment casting mold were examined by differential scanning calorimetry (DSC) and Laserflash methods for temperatures up to 1300 °C. The specific heat capacity was determined to 1.13 J/(g K), thermal diffusivity was found to be in the range of (4-5) × 10−7 m2/s and the thermal conductivity to be 1 ± 0.1 W/(m K). 相似文献
7.
通过采用ProCAST软件对消失模铸造中碳钢磨球的充型及凝固过程进行了数值模拟,预测其缺陷产生的部位,并分析其产生的原因。在此基础上,对生产磨球的工艺进行了优化,有效地避免了缩松、缩孔在其重要部位的产生,大大降低了废品率,提高了磨球的使用寿命和质量。 相似文献
8.
Yttrium (Y) was incorporated by an ion-plating method either before or after pack aluminizing to maximize the corrosion resistance of IN 713C. Various combinations of pack aluminizing and yttrium-ion plating were examined with respect to coating sequence, aluminum activity, and corrosive environment. Of all the various coating combinations examined, the best corrosion resistance was obtained from H/A + Y (high-activity aluminizing + Y-ion plating) type composite coatings. Uniformity of the Y deposition was greatly dependent upon the surface condition of the aluminide-coating layer. The high-activity aluminide coating gave better uniformity of Y deposition than did the low-activity-aluminide coating.Improvement of corrosion resistance by the Y-modified-aluminide composite coatings of H/A + Y type occur because the presence of Y between the Al2O3 columns improves Al2O3 scale adherence and substantially prevents depletion of Al in the aluminide-coating layer. 相似文献
9.
Valentina Naglieri Hrishikesh A. Bale Bernd Gludovatz Antoni P. Tomsia Robert O. Ritchie 《Acta Materialia》2013,61(18):6948-6957
The processing of ceramic scaffolds using the ice-templating, or freeze casting, technique provides a relatively simple means to mimic the hierarchical design of natural materials such as nacre. In the present study, we investigated the architecture of silicon carbide (SiC) scaffolds produced by this technique over a range of cooling rates and suspension characteristics to demonstrate its versatility and effectiveness for fabricating unidirectional porous bodies with controlled lamella thickness, porosity fraction and morphology. An array of microstructures was generated specifically to examine the role of the suspension solid load and cooling rate on the pore morphology and final ceramic fraction. With respect to the morphology of the pores, a transition from lamellar to dendritic structure was found to be triggered by an increase in cooling rate or in suspension concentration. Similarly, the freezing condition and suspension characteristics were seen to influence the transition between particle rejection and entrapment by the ice. Based on this study, the specific processing parameters that result in distinct scaffold morphologies, namely lamellar, dendritic or isotropic morphology (the latter corresponding to particle entrapment), are identified and presented in the form of a “morphology map” to establish the regions of the different architectures of freeze-cast SiC scaffolds. 相似文献
10.
杨胜男;吴文云;汪东红;曹阳根 《特种铸造及有色合金》2016,36(6):623-625
大型不锈钢汽轮球阀结构复杂、壁厚不均,存在孤立热节,熔模铸造时存在局部缩松。借助ProCAST软件,在分析原有工艺方案的基础上,对浇冒系统的结构进行了重新设计,并采用特殊方法引入铸造冷铁,使铸件实现自下而上的顺序凝固,成功消除了球阀铸件孤立热节处的缩松缺陷,提高了产品的合格率。 相似文献
11.
陈凯;汪东红;刘淑梅;李贺;李飞 《特种铸造及有色合金》2016,36(9):972-974
医用不锈钢涡管结构复杂、壁厚不均,存在孤立热节,熔模铸造时存在局部缩松,影响铸件的正常使用,产品合格率低。借助ProCAST软件,在分析原有工艺方案的基础上,对浇注系统的结构进行了重新设计,新的浇注系统为铸件边缘部分提供金属补缩,解决了涡管铸件热节处的缩松缺陷,提高了产品的合格率。 相似文献
12.
以解决铸件热裂为目的,以生产中遇到的典型铸件为例,利用ProCAST铸造模拟软件,对不同铸件结构和不同浇注工艺条件下的铸件热裂缺陷形成倾向进行了系统研究,得到了优化后的铸件结构和铸造工艺,并进行了生产验证,其结果基本吻合。 相似文献
13.
基于ProCAST软件的数值模拟,分析了ZL101A合金熔模铸造零件缺陷出现的原因。通过模拟分析发现,零件凸台处的厚度不均匀是产生缩松、缩孔缺陷的原因。对于厚度不均匀的零件,提高型壳温度,同时选择合理的浇注温度,可以有效消除此类零件的内部缺陷。试验表明,当浇注温度为720℃,型壳预热温度为400℃时,可以较好地避免缩松、缩孔缺陷的产生,获得较为合格的铸件。 相似文献
14.
曹岩;张浩;石亚茹;黄亮 《特种铸造及有色合金》2018,38(11):1226-1229
利用铸造模拟技术对铸件充型凝固过程进行分析,可以大大降低成本,缩短试制周期。基于此,利用ProCAST软件对薄壁叶片的熔模精铸过程进行数值模拟,通过分析铸造缺陷,提出从浇注系统结构和浇注工艺参数两方面进行工艺优化,获得了合格的铸件。 相似文献
15.
16.
17.
丁华锋;金先志;陈涛;潘俊杰 《特种铸造及有色合金》2022,42(2):248-252
经验法熔模铸造成形的弯管接头零件在通孔内壁和底座圈上都普遍存在缩松。利用ProCAST软件,对弯管接头铸件进行缺陷分析,分别从浇注系统的优化和增设冒口及冷铁入手,研究两种可以降低铸件缩松率的方案。对比发现,对浇注系统进行优化为最优方案,并在此基础上设计了正交试验。结果表明,在浇注温度为1 520℃、浇注速度为0.6 kg/s、型壳预热温度为1 120℃下,缩松率最大为1.44%,有效提高了产品品质。 相似文献
18.
19.
介绍了35 MN快锻机立柱的铸造工艺方案.利用铸造模拟软件ProCAST对铸件进行了充型与凝固过程的数值模拟.基于模拟结果,确认了浇冒口系统与外冷铁设置的合理性,并最终获得了合格的铸件产品. 相似文献