钛合金铸造用金属铸型研究

Research on Metal Mold Technology for Titanium Alloy Casting

金属型工艺因具有模具加工污染小、可多次反复使用、生产效率高、批量生产时铸件成本低,以及铸件尺寸稳定、精度高等特点,被认为是钛合金铸件生产中最具潜力的工艺之一。然而,金属型工艺的激冷作用较强,导致成形的钛合金铸件表面含有冷隔、流痕等缺陷,且金属型工艺的使用寿命较短,限制了该工艺的广泛应用。经研究表明,在铸型内腔涂敷一层涂层可以有效地解决上述问题。基于此,本文结合钛合金用金属型铸型材料的界面导热特性,研究了涂层制备工艺及其对钛合金铸件表面质量的影响。最终确定了最佳的钛合金金属型铸造工艺,显著地提高了钛合金铸件的批量生产。

The metal mold casting is considered to be one of the most potential titanium alloy castings processes because of its multiple advantages, such as low pollution, reusability, high production efficiency, low casting cost during batch production, stable casting size, and high precision. However, with the strong chilling effect of the permanent type process, the titanium alloy castings have some surface defects including cold insulation and fow marks, besides, the short service life of the permanent mold limits the application scope of the process.The studies show that the above problems can be effectively solved by adding a coating layer. Therefore,combining with the interfacial thermal conductivity properties of permanent mold casting materials for the titanium alloys, this paper studied the coating preparation process and its influence on the surface quality of the titanium alloy castings. The optimum titanium alloy permanent mold casting process was finally determined, which significantly improved the mass production of the titanium alloy castings.