【摘要】 本文系统地研究了用低温陶瓷结合剂制作CBN平面磨砂轮的工艺过程,确定了合适的工艺参数。结果表明:选用烧制温度范围较宽(660～800℃)的低温陶瓷结合剂,可以通过调节烧结温度调整砂轮的硬度和强度,缓慢的升温和降温速度是抑制砂轮产生裂纹的有效方法;加入造孔剂既能得到满足客户需要的孔隙率,又能保证其抗折强度不低于30MPa。砂轮强度随气孔率增加而快速降低,当气孔率为18.02%时,其抗折强度为67.33MPa;当气孔率增加到37.60%时,其抗折强度降为33.09MPa;当气孔率进一步增加到47.85%时,其抗折强度下降到20.44MPa。通过合理选用工艺参数,所制备的陶瓷结合剂CBN平面磨砂轮,具有磨削效果好,生产效率高,寿命长及性价比高的综合特性。更多还原

【Abstract】 CBN surface grinding wheels were prepared using low-temperature vitrified bond and their appropriate technique parameters are studied.The experimental results show that,owing to the wide range of sintering temperatures of the vitrified bond which is 660~800 ℃,the hardness and strength of CBN wheels can be adjusted to the customers requirements by choosing different sintering temperature.A low temperature increasing and decreasing speed can effectively prevent the wheels from cracking.With different pore-forming agents,the porosity can be adjusted according to requirement of the clients,while the bending strength of CBN wheels are guaranteed to no lower than 30 MPa.The strength of CBN wheel drops down as its porosity increases;when the porosity of CBN wheel is 18.02%,37.60%,47.85%,their bending strength is 67.33 MPa,33.09 MPa,20.44 MPa,respectively.By adopting suitable process parameters,CBN wheels have obvious advantages such as good grinding performance,high working efficiency,a long service life and high effect-cost ratio.更多还原