With the mathematics model of simple harmonic oscillator, we also studied the friction energy and its distribution between diamond bit and rocks. The distribution of friction energy between diamond bit and rocks is related with their elastic modulus(hardness), and the distributive law is as follows:Q 1∶Q 2=E 2∶E 1.
It is showed that the best volume distribution exponent (n) is 1.2,and the number of the coatings is 6.The axial tensile stress in functionally graded polycrystalline diamond compact is reduced from 986 MPa to 323 MPa compared with two layer polycrystalline diamond compact,and the shear stress is reduced from 722 MPa to 454 MPa.
Through investigating the diamond-silicon grinding system, the grinding mechanism, including chip removal and subsurface damage, is discussed with the aid of the molecular dynamics (MD) approach and grinding experiments.
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Ultra-precision ductile grinding of BK7 using super abrasive diamond wheel
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Under optimised conditioning parameters, the super abrasive diamond wheel was well conditioned in terms of a minimized run-out error and flattened diamond grain surfaces of constant peripheral envelope.
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Aggregation Stability of SiO2, FeOOH, ZrO2, CeO2, and Natural Diamond Sols and Their Binary Mixtures: 1.
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The aggregation stability of SiO2 (aerosil OX-50), FeOOH, ZrO2 CeO2, and natural diamond sols was studied by photometry over a wide range of KCl and BaCl2 concentrations at pH 6 and 3.
The coring system YPK 36-I used widely at present in underground diamond drilling has advantages of reasonable structure, reliability and long life.This paper discusses specially following problems involved in coring systems: thread design and steadiness of steel and aluminium string of drill rods, structure principle of the swivel type double tube core barrels, inseparable head assembly, design speciality of ribbed core lifter case, and reasonability problem of the relation between the dimensions of ...
In this paper a mechanical model of the functions of roof bolts is established in which the roof bolts not only bind the roof stratum but also work as flexible support points giving reaction to the rock roof of the mine roadways. On the basis of the theory that the "ply-plates " show a changeable rigidity and a small deflection, a comparative analysis can be conveniently carried out by using finite difference equations of the effects of different arrangement of roof bolt groups of the same spacing and the s...
On the average, footage drilled per month for each drill machine went up from 284 m in 1983 to 546 m by the end of August, 1987. Experiences for this achievement may be summarized as following: 1. proper arrangement of drilling in geological exploration; 2. making use of new techniques of synthetic diamond drilling; 3. quickening our step to renew the drilling equip merits; 4. strengthening the management of production and the research work of science and technology; 5. improving drilling operation sy...