In order to get low surface roughness and high material remove rate, basic research on the optimization of process parameters in creep feed ultrasonic grinding engineering ceramics was conducted.

为了在加工中获得良好的表面质量和大的材料去除率，本文开展了蠕动进给超声磨削工程陶瓷参数优化的基础研究。

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Basic knowledge of polyethylene material, pipe fittings specifications, pipeline construction specifications, technical points, management experience and design parameters.

聚乙烯材料基础知识、管材管件规格、管道的施工规范、技术要点、管理经验及设计参数。

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Effects of various process parameters on the surface cracking of steel grade HRB335 have been studied with the on-site data acquired from Yongxin Steel-making Plant as the basic material.

以永兴钢厂现场生产数据为基础，研究各种工艺参数对HRB335钢种表面横裂纹的影响。

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