| 1. | Solidification process simulation and shrinkage cavity prediction of cylinder head casting
气缸盖铸件凝固过程数值模拟及缩松缩孔预测 |
| 2. | What inspection functions are performed for the detection of casting cracks , porosity , and shrinks
如何检验铸件的裂纹，缩孔，缩松？ |
| 3. | Effect of inhaled budesonide and formoterol in treating moderate persistent children asthma
吸入布地缩松联用福莫特罗治疗儿童中度持续哮喘的作用 |
| 4. | Dispersed shrinkage is the main reason causing leakage of multi - cylinder heads of diesel engines
摘要缩松缺陷是导致多缸柴油机缸盖铸件渗漏的主要原因。 |
| 5. | Shrinkage / porosity is a common defect in castings and one of main causes making products waste
缩孔缩松是铸件常见的缺陷，是产生废品的主要原因之一。 |
| 6. | By improving foundry method , controlling composition , choosing appropriate inoculant and using te - coating , the shrinkage defect could be reduce effectively
通过改进铸造工艺、控制铁液成分、选择合适的孕育剂、使用碲涂料等综合控制手段，能有效降低缩松缺陷率，防止缸盖的渗漏现象。 |
| 7. | The ultimate aim of the numerical simulation on temperature field in castings solidification process is for eliminating shrinkage / porosity or limiting them within the user ' s permission
铸件凝固过程温度场数值模拟为最终消除缩孔缩松缺陷或将其限制在用户允许的范围内，以获得质量合格的产品提供了非常有效的手段。 |
| 8. | It is because that the forging and heat treatment can greatly change the mechanical properties of steel , reduce the shrinkage cavity and dispersed shrinkage in metal structure , and keep the organizational structure tighter
通过锻造和热处理，可大大改变钢材的力学性能，减少金属结构内的缩孔缩松现象，使其组织结构更紧密。 |
| 9. | The key to prediction of casting shrinkage / porosity lies in ascertaining the critical value of temperature gradient and niyama criterion . the thesis put forward two methods to ascertain the value , one is which is positive - direction and the other is negative - direction . we verify the realistic arithmetic of temperature gradient method and niyama criterion method by experiment , and we can draw a conclusion that the arithmetic is correct and reasonable in most cases and choice of developing tool is sound
临界梯度值和新山判据临界值的确定是实现缩孔缩松预测的关键，本文提出了确定临界值的正向法和反向法，并以高铬铸铁件缩孔缩松预测和铸造工艺改进为研究对象，应用正向法，确定了温度梯度法的临界值为180 m 。 |
| 10. | On the basic of the detailed analysis on main causes and main prediction methods of casting shrinkage / porosity , we put forward two methods to describe the solid phase rate of materials solidification . one is liner - distributing method , and the other is parabola - distributing method . and then , we apply the former to the system
本文在充分分析铸件缩孔缩松产生机理与主要预测方法的基础上，提出了材料凝固固相率的线性分布法和抛物线分布法，并将前者应用于系统中；同时提出了温度梯度法和新山判据法的实现算法，此算法具有一定的灵活性。 |
