Specific Energies in Sawing with Diamond Segments and Grinding of a Diamond Segment

2008 ◽  
Vol 375-376 ◽  
pp. 375-379
Author(s):  
Yi Qing Yu ◽  
Yuan Li ◽  
Xi Peng Xu
Keyword(s):  
Experimental Study ◽  
Specific Energy ◽  
Horizontal Force ◽  
Diamond Sawblade ◽  
Spindle Power

An experimental study was undertaken to compare the mechanisms of two different processes to dress metal-bonded diamond segments. In one case, a piece of vitrified SiC wheel was used as workpiece and sawn by diamond segments attached to a sawblade. In another process, a diamond segment was used as workpiece and ground by an Al2O3 wheel. Spindle power was measured in sawing and horizontal force was monitored in grinding, in which case the latter was then used to get the consumed power in grinding. Specific energies were then calculated from the measured or converted power. For sawing of SiC wheel with the diamond sawblade, the maximum specific energy was found to be only 0.5 J/mm3, whereas the specific energy was up to 25 J/mm3 in the grinding of the diamond segment.

Mechanisms for Sawing of Refractory Bricks with Diamond Blades

2009 ◽  
Vol 16-19 ◽  
pp. 1143-1148
Author(s):  
Yi Qing Yu ◽  
Yuan Li ◽  
Xi Peng Xu
Keyword(s):  
Specific Energy ◽  
Normal Force ◽  
Experimental Studies ◽  
Horizontal Force ◽  
Slurry Erosion ◽  
Diamond Grit ◽  
Circular Sawing ◽  
Force Components ◽  
Refractory Bricks ◽  
Spindle Power

Experimental studies were undertaken to investigate the mechanisms for circular sawing of refractory bricks with diamond segmented saw blades. Three kinds of diamond segments of different hardness were fabricated for the saw blades. The vertical and horizontal force components and the spindle power were measured in sawing. Based on the measurements of force and power, the specific energy and the normal force per diamond grit were obtained. The normal force per grit in the sawing of refractory bricks was found to be only 5% of the static compressive strength of diamonds used in the present study, but fractures of diamonds were still popular on the segment working surfaces after sawing. The power, horizontal force, and the specific energy were found to increase with segment hardness. The specific energy obtained from the measured power was basically comparable to the values obtained from a theoretical equation to calculate the specific energy associated with slurry erosion to the bond matrix of segments.

Experimental Study on the Transverse Stiffness of WJ-8 Rail Fastening

2014 ◽  
Vol 596 ◽  
pp. 3-6 ◽  
Author(s):  
Can Liu ◽  
Zhi Ping Zeng ◽  
Bin Wu ◽  
Jia Yu Yuan ◽  
Xian Feng He
Keyword(s):  
Experimental Study ◽  
Lateral Displacement ◽  
Horizontal Force ◽  
Test Results ◽  
Transverse Stiffness ◽  
Loading Device ◽  
The Relationship

The study of WJ-8 rail fastening is about the relationship between lateral horizontal force and rail’s lateral displacement, and the rail fastening’s transverse stiffness was obtained since the rail slipped. The rail lateral displacement was measured by using the loading device of rail’s lateral horizontal force which was changed as needed. Moreover, when the lateral horizontal force changes, it was analyzed that how it affected rail’s lateral displacement and rail fastening’s transverse stiffness under different bolt torque conditions. Therefore, the recommended value of transverse stiffness is acquired which is based on analyzing the test results.

Experimental Study on the Distribution Coefficient of Horizontal Force Acting on the Wharf Transverse Bents

2013 ◽  
Vol 834-836 ◽  
pp. 1281-1284
Author(s):  
Zhang Yue ◽  
Zhu Feng ◽  
Pei Ran Wang ◽  
Xiang Li
Keyword(s):  
Experimental Study ◽  
Distribution Coefficient ◽  
Transverse Component ◽  
Structure Calculation ◽  
Horizontal Force ◽  
Concentrated Force ◽  
Relative Stiffness ◽  
Design And Construction

The force of ship is one of the main loads which High-Piled Wharf bears, the assignation of transverse component on each bent is the precondition of the calculation which simplified the wharf structure into plane bent. The taking value of transverse component on bent influences a lot on the result of structure calculation. Nowadays, the design of High-Piled Wharf uses the value from the distribution coefficient in the Design and Construction Code of High –Piled Wharf. The results show that the distribution coefficient taken in the code is under the precondition that considering the beam is rigid; the relative stiffness of beam and pile can influence this distribution coefficient. Considering the flexibility of the beam, the distribution coefficient of the horizontal concentrated force on transverse bents will change.

Forces in Surface Grinding of Granites with a Brazed Diamond Wheel

2006 ◽  
Vol 315-316 ◽  
pp. 185-189 ◽  
Author(s):  
Hui Huang ◽  
G.Q. Zhang ◽  
Y.J. Zhan ◽  
Xi Peng Xu
Keyword(s):  
Experimental Study ◽  
Specific Energy ◽  
Material Removal ◽  
Tangential Force ◽  
Diamond Wheel ◽  
Surface Grinding ◽  
Vertical Force ◽  
Tool Surface ◽  
Ductile Flow ◽  
Force Components

An experimental study was carried out to investigate the process in surface grinding of two kinds of typical granite with a brazed diamond wheel. The horizontal and vertical forces were measured to obtain the data for the tangential and vertical force components as well as specific energy. Micrograph observations on tool surface and granite surface were coupled to check the prevailing mechanisms for material removal. Although the red granite is more difficult to machine than the black granite, according to factory records, the normal and tangential force components and specific energy for red granite were lower than that for black one, which might be attributed to the high height protrusion of brazed tool and the more ductile flow occurred in the grinding arc of black granite compared to the red one.

An experimental study of flow into orifices and grating inlets on streets

2006 ◽  
Vol 33 (7) ◽  
pp. 837-845 ◽  
Author(s):  
Z Mustaffa ◽  
N Rajaratnam ◽  
David Z Zhu
Keyword(s):  
Experimental Study ◽  
Froude Number ◽  
Specific Energy ◽  
Discharge Coefficient ◽  
Laboratory Scale ◽  
Scale Model ◽  
The Third ◽  
Flow Through ◽  
Coefficient Of Discharge ◽  
The City

Findings are described from a laboratory-scale model of flow through orifices on manhole covers and through three types of grating inlets used by the City of Edmonton. The results demonstrated that the flow through these orifices can be calculated using an orifice equation with a coefficient of discharge equal to 0.616 in a ponding situation but decreasing with an increase in the Froude number of the flow. The roughness of the manhole cover was found to slow down this reduction. For the three gratings, the inflow can be calculated with an orifice type of equation when the gratings are submerged. The discharge coefficient in this equation is approximately constant for two of the gratings and decreases somewhat with an increase in the Froude number of the flow for the third grating if the specific energy of the approaching flow is used as the length scale.Key words: street inlet, street hydraulics, grating inlet, orifice flows.

An Experimental Study of Specific Energy in Grinding Granite

2004 ◽  
Vol 471-472 ◽  
pp. 625-629 ◽  
Author(s):  
Yi Qing Yu ◽  
Yuan Li ◽  
Xi Peng Xu
Keyword(s):  
Experimental Study ◽  
Working Conditions ◽  
Specific Energy ◽  
Material Removal ◽  
Unit Volume ◽  
Failure Modes ◽  
Diamond Tools ◽  
Removal Mechanisms

An investigation is reported of the characteristics of specific energy in grinding of granite using diamond abrasives. The effects of many parameters, such as the types of diamond tools, the types of abrasives, the properties of granite, the conditions of lubrication, and the working conditions of diamond tools, were studied. The power consumed in grinding was measured in order to obtain the specific energy, which is defined as the energy expended per unit volume of material removal. It is found that the specific energy for grinding of granite was closely related to the removal mechanisms of granite, the failure modes of diamonds and the interactions of the swarf with the applied fluid and bond matrix.

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