Wear Characteristics of Impregnated Diamond Bit in Drilling Armor Ceramic

2011 ◽  
Vol 179-180 ◽  
pp. 1150-1155
Author(s):  
Chao Gao ◽  
Jun Tang Yuan ◽  
Hao Jin ◽  
Zhong Quan Song
Keyword(s):  
Crystal Shape ◽  
Wear Characteristics ◽  
Comprehensive Properties ◽  
Impregnated Diamond Bit ◽  
Optimal Value ◽  
Abrasion Rate ◽  
Diamond Grain ◽  
Diamond Bit ◽  
Impregnated Diamond Bits ◽  
Diamond Abrasive

This paper describes the wear characteristics of impregnated diamond bits when drilling in Al2O3 armor ceramic. With different bits being developed, drilling experiments and scanning electron microscope (SEM) examinations were conducted, and the results show that diamond wear types consist of complete crystal shape, micro fragmentation, whole fragmentation, wearing flat and falling off of diamond; abrasive wear, impact abrasion and erosion exist in the wear of diamond and bond; diamond grain size and concentration have their optimal value under fixed machining conditions; diamonds of high quality could increase bit drilling efficiency and serving life; the bit whose abrasion rate of bond matches that of diamonds presents the best comprehensive properties.

Study on Friction and Wear Properties of Self-Lubricating Impregnated Diamond Bit Cutters

2011 ◽  
Vol 175 ◽  
pp. 136-139 ◽  
Author(s):  
Bing Suo Pan ◽  
Xiao Hong Fang ◽  
Ming Yuan Niu
Keyword(s):  
Friction Coefficient ◽  
Friction And Wear ◽  
Matrix Material ◽  
Wear Loss ◽  
Wear Properties ◽  
Wear Process ◽  
Impregnated Diamond Bit ◽  
Pin On Disc ◽  
Friction And Wear Properties ◽  
Diamond Bit

To reduce the friction coefficient between impregnated diamond bit and rock, experiments on addition of graphite to the matrix material of bit cutters were conducted. The cutters were made up of diamond contained working layers and binding layers. The friction and wear properties of cutters and binding layers were investigated using a pin-on-disc friction & wear tester with granite as tribopair. The results showed that with addition of graphite, the hardness and friction coefficient of binding layer decreased, but its wear resistance increased; compared to cutters without graphite, those cutters containing graphite had lower wear loss and friction coefficient and their sliding wear process was much steadier, but diamond protrusion was still normal.

Abrasion, Clearance and Matlab-Aided Optimized Profile Design of Cam Mechanism

2013 ◽  
Vol 416-417 ◽  
pp. 1120-1125
Author(s):  
Zhen Jun He ◽  
Peng Xu ◽  
Jian Rong Lu
Keyword(s):  
Mathematical Model ◽  
Objective Function ◽  
Optimized Design ◽  
Kinematic Accuracy ◽  
Cam Mechanism ◽  
Optimal Value ◽  
Abrasion Rate ◽  
Cam Profile ◽  
Profile Design ◽  
Optimization Mechanism

To demonstrate the importance of abrasion and clearance to machinery, this paper studied abrasion of Cam mechanism contact surface, illustrated how abrasion and clearance relate to each other and investigated how they influence kinematic accuracy of the mechanism. In the case of Cam mechanism with flat-bottomed translation follower, it elaborated abrasion styles and bad points and depicted heart-shaped abrasion rate curve. It proposed a mathematical model and optimized design for cam profile, taking abrasion design as an objective function. Aided by Matlab and its optimization toolbox, it also proposed a optimized solution to the objective function mathematical model. And powered by computing capabilities of Matlab, it determined the coefficients in a high-order five-term function and found the optimal value of the objective function quickly in need. By optimization, mechanism abrasion improves and its kinematic accuracy and reliability increase, prolong its life.

Development of a Rotary Drilling Mechanism for Impregnated Diamond Bits

2014 ◽  
Vol 989-994 ◽  
pp. 3136-3139
Author(s):  
Zhan Tao Li ◽  
Yong Zheng Ma ◽  
Ken-ichi Itakura
Keyword(s):  
Diamond Particle ◽  
State Theory ◽  
Mechanical Parameters ◽  
Rotary Drilling ◽  
Core Drilling ◽  
Geological Surveys ◽  
Proposed Model ◽  
Optimal Value ◽  
Operation Parameters ◽  
Impregnated Diamond Bits

Impregnated diamond core bits are often used in core drilling for geological surveys. A tri-state theory is proposed to describe the three states in drilling processes for a diamond particle or a bit. These states are contacting state, cutting state, and ploughing state. Furthermore, the relations among thrust and other mechanical parameters are also summarized. The optimal value of the specific energy is in the cutting state. Several experiment results verified the proposed model. This mechanism is useful for selecting operation parameters in core drilling using impregnated diamond core bits.

scholarly journals Effect of Graphite Addition on Impregnated Diamond Bit Properties

2019 ◽  
Vol 41 (4) ◽  
pp. 237-246
Author(s):  
Lanlan Xie ◽  
Liyi Chen ◽  
Xiaolin Huang
Keyword(s):  
Impregnated Diamond Bit ◽  
Diamond Bit
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