采用新型粘结预混粉提高零件生产稳定性

Improve the consistency of components by using an improved bonded mix

粉末冶金工艺是一种具有良好经济效益的近净成形工艺,在规模生产条件下,具有较明显的生产成本优势。然而,在压制和烧结过程中,有时会面临产品之间尺寸偏差较大等问题,从而需要额外的精整或机加工等后处理工艺来满足尺寸精度的要求。粘结预混粉(Starmix^(TM))是通过有机粘结剂将细小颗粒的添加组元牢固地粘结在基粉表面上,从而减少其在混粉中的偏析,可以提高粉末在压制过程中的填充性,进而改善零件成形过程及性能的稳定性。尝试应用添加新型润滑剂的粘结预混粉在工业生产条件下生产形状复杂并且尺寸精度要求较高的零件。结果表明,该粘结预混粉不仅提高了压制零件的尺寸精度和质量稳定性,而且改善了压制过程中的润滑性,同时可制备出更清洁的零件表面。

One of the main advantages of PM technology is its ability to make near net shape components with a cost efficient process.However,variation in the dimensions of products after compaction and sintering that often calls for sizing or machining to reach the desired tolerance class.Bonded organic mixes have been developed to improve the consistency by reducing the segregation of elements in mix and improving the filling characteristics.An improved bonded mix combined with a recently developed lubricant,was evaluated by indutrial production of a complex shape component with tight tolerances.Many benefits of dimenisonal consistancy,weight precision,better lubrication as well as clean surfaces by using the improved bonded mix were presented.