【摘要】：晶態(tài)Ni基釬料固相線溫度高,爐中釬焊制作釬焊微粉金剛石工具耗時長,處于高溫環(huán)境中的金剛石磨粒極易產(chǎn)生熱損傷,導(dǎo)致金剛石磨粒磨削性能下降。為了減少磨粒表面熱損傷,同時提高釬料對金剛石磨粒的潤濕性,增強金剛石與Ni基釬料之間的結(jié)合力,采用非晶Ni基釬料爐中加熱制作釬焊微粉金剛石工具,旨在提高釬焊金剛石微粉工具的加工性能。本研究以爐中加熱制作釬焊金剛石微粉磨頭為例進行原理性論證工作,完成了以下具有創(chuàng)新意義的結(jié)論:(1)Ni基釬料熱分析曲線顯示晶態(tài)Ni基釬料熔化溫度區(qū)間大約為933℃~1044℃,非晶Ni基釬料的熔化溫度區(qū)間大約為913℃~993℃,其熔化溫度區(qū)間更窄,熔化速度更快,可以有效減少金剛石磨粒的熱損傷。(2)45鋼基體粗糙度對Ni基釬料與基體之間的潤濕性影響研究表明,隨基體粗糙度的增加,非晶Ni基釬料在45鋼基體上的潤濕面積先升高后降低,晶態(tài)釬料則先減少后增加再減少,二者同時在基體粗糙度Ra為0.5μm時潤濕面積最大。非晶Ni基釬料的潤濕面積隨著釬焊溫度的升高呈現(xiàn)出先升高后降低的變化趨勢,當(dāng)釬焊溫度為950℃時,潤濕面積最大為4.9cm2。(3)非晶釬料金剛石磨頭磨削工程陶瓷和ZL102鋁合金時的材料去除率分別為晶態(tài)釬料金剛石磨頭的1.26倍和1.3倍,磨削加工225min后,磨削弧區(qū)溫度比晶態(tài)釬料金剛石磨頭分別低59℃和70℃。(4)分別對已經(jīng)磨削加工工程陶瓷和ZL102鋁合金300min后的非晶釬料釬焊金剛石磨頭進行SiC油石修銳,修銳后的非晶釬料金剛石磨頭的工程陶瓷材料去除率相比于未修銳前提高了59%,ZL102鋁合金的材料去除率提高了65%。非晶Ni基釬料的使用降低了微粉金剛石釬焊溫度,優(yōu)化了爐中釬焊金剛石工藝,提高了爐中釬焊金剛石微粉工具的磨削性能,對爐中釬焊金剛石微粉工具的廣泛使用提供了理論和試驗依據(jù)。
[Abstract]:Because of the high temperature of solid phase line of crystalline Ni solder and the time consuming of brazing diamond tools in furnace, diamond abrasive particles in high temperature environment are prone to thermal damage, which leads to the degradation of grinding performance of diamond grains. In order to reduce the surface thermal damage of abrasive particles, improve the wettability of brazing materials to diamond abrasive particles, and enhance the bonding force between diamond and Ni base solder, the brazing micro-powder diamond tools were made by heating in amorphous Ni base brazing furnace. The purpose of this paper is to improve the machining performance of brazing diamond powder tools. In this study, the principle of brazing diamond micro-powder grinding head by heating in furnace was studied, and the following innovative conclusions were achieved: (1) the melting temperature range of crystalline Ni based brazing filler metal was about 933 鈩，

本文編號：2291468