R&D of Innovative, Heavy-Duty Thread Extension Steel Bars for Rock Drilling Which are Ultra-Long, Ultra-Thick and of High Price/Performance Ratio
liu gan ;, rao jian hua ;, xiong bo ;, ye ling yun ;, yin he ping ;, zhang guo zuo ;, zhang han bin ;, zhou chu chun ;, zhou zuo ;

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The Modal Characteristics Analysis of Whole Structure of Ultra Large Fixed Type Hydraulic Crusher
LUO Ming;,XU Bi-yong;,ZUO Li-sheng;

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Drill Rod Joint Elastic Model and Experimental Study
GAO Bo;,HA Chun-lin;,HOU Yang-song;,LUO Ren;,LV Chuang;,WANG Jian-hua;

..............page:23-26

Analysis of Defects of Shells like Deformations Used in the Investment Cast
PAN Yu-hong;

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The NC Turning Programming Method of Different Shape Thread
NI Chun-jie;

..............page:33-35

Summary of 3D Printing Technology and Its Application
LI Xin;

..............page:36-41

A Brief Analysis of the Status Quo of IP Protection in China's Rock Drilling Machinery Sector
JIAN De-hui;

..............page:42-46

On Safety Issues of Underground Air Compressors Used in Coal Mines
XU Xie-nan;

..............page:47-50,56

Control on uniformity and plate-like morphology abnormal growth of the WC grain in cemented carbide
KONG De-fang;,PENG Yu-bo;,ZHANG Hao;,ZHANG Wei-bin;,ZHU Li-rong;

..............page:51-56

xin xi dong tai

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