通过在MK9025A型曲线磨床上开展微晶玻璃陶瓷磨削试验，研究可加工陶瓷表面成形机制和表面粗糙度。结果表明，可加工陶瓷材料磨削时其材料去除具有延性去除、延脆性去除、脆性去除三种模式，以硬脆材料相关系数Mr改进可加工陶瓷未变形切屑厚度模型，提出延性域系数η0、延脆性域系数η1，用以构建延性-延脆性和延脆性-脆性两个临界磨削深度模型。根据可加工微晶玻璃陶瓷单因素磨削试验，提出了复合磨削因子Q，基于以上未变形切屑厚度模型和两个临界磨削深度模型建立表面粗糙度模型，得到了表面粗糙度与复合磨削因子之间的关系，利用标准差检验模型精度。正交试验验证结果表明，可加工微晶玻璃陶瓷表面粗糙度试验值与所建立的表面粗糙度模型理论值吻合度较高。
马廉洁
,
巩亚东
,
顾立晨
,
王华
,
田俊超
,
李亮
. 可加工微晶玻璃陶瓷磨削表面成形机制[J]. 机械工程学报, 2017
, 53(15)
: 201
-207
.
DOI: 10.3901/JME.2017.15.201
The mechanism of surface forming and surface roughness are studied in grinding process of machinable glass ceramics by the grinding experiment which is conducted on the MK9025A curve grinder. The results indicate that there are three forms when grinding ceramic materials, such as ductile removal, ductile brittle removal and brittle removal. The undeformed chip thickness model of machinable ceramics is improved by the correlation coefficient of brittle materials Mr. Also, the ductile-ductile brittle and ductile brittle-brittle critical grinding depth models are developed by putting forward the ductile domain coefficient η0 and the ductile brittle domain coefficient η1. The composite grinding factor Q is proposed according to the single factor experiment of machinable glass ceramics in grinding and the model of surface roughness is established based on the above undeformed chip thickness model and two critical grinding depth models. The relationship is obtained between surface roughness and the composite grinding factor. The accuracy of model is tested with the standard deviation, and the results of orthogonal experiments indicate that the experimental value of surface roughness of machinable glass ceramics is in agreement with the theoretical value of the model of surface roughness.
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