scholarly journals Prototyping a remotely-controlled machine for concrete surface grinding operations

2016 ◽  
Vol 23 (2) ◽  
pp. 183-193 ◽  
Author(s):  
Sungwoo MOON ◽  
Jeonghwan KIM ◽  
Jongwon SEO
Keyword(s):  
Ground Surface ◽  
Field Tests ◽  
Concrete Surface ◽  
Surface Grinding ◽  
Hardened Concrete ◽  
Construction Sites ◽  
Grinding Machine ◽  
Grinding Operations ◽  
Subsequent Layer

The surface of concrete pavement needs to be flattened for the smoothness and comfortability of highways. Surface grinding can provide flatness in the hardened concrete surface, and improve adhesion between the existing con­crete surface and the subsequent layer. The surface grinding process, however, is executed under hazardous work condi­tions and the outcome is affected by a machine operator’s skill. Automation of this process can provide a hazard-free work environment and increase the quality of the ground surface. This paper presents an application of an automated concrete surface grinding machine that an operator can remotely control with computer assistance. A combination of hardware and software technologies was applied to prototype automated functions of the machine. Field tests demon­strated that remote control of concrete surface grinding is feasible and can be utilized as a semi-automated scheme on actual construction sites.

Effectiveness of remote control for a concrete surface grinding machine

2010 ◽  
Vol 19 (6) ◽  
pp. 734-741 ◽  
Author(s):  
Sungwoo Moon ◽  
Byongsoo Yang ◽  
Jeonghwan Kim ◽  
Jongwon Seo
Keyword(s):  
Remote Control ◽  
Concrete Surface ◽  
Surface Grinding ◽  
Grinding Machine

scholarly journals Evaluation of Ground Surface Pregrouting in a Mountain Tunnel Based on FAHP

2019 ◽  
Vol 2019 ◽  
pp. 1-17 ◽  
Author(s):  
Changan Zhu ◽  
Runfang Sun ◽  
Hua Xu ◽  
Yiwei Liu ◽  
Zhuang Chen
Keyword(s):  
Quality Evaluation ◽  
Ground Surface ◽  
Field Tests ◽  
Analytic Hierarchy ◽  
Quality Classification ◽  
Final Score ◽  
Hierarchy Process ◽  
Mountain Tunnel

The quality of ground surface pregrouting (GSPG) is commonly qualitatively evaluated using single factor; however, the quality evaluation involves numerous facets, and a quantitative evaluation is rare. The aim of this study was to quantitatively evaluate the quality of a GSPG based on three aspects. The fuzzy analytic hierarchy process (FAHP) was adopted to obtain the final score and quality classification of the GSPG. Based on three aspects, namely, integrity, continuity, and sturdiness, a series of field tests was also conducted, qualitatively evaluating the quality of the GSPG preliminary, to obtain the required test data and verify the FAHP results. The results of the FAHP showed that the quality of the GSPG was 86.42, which could be classified as “Good”, whereas the field tests exhibited that the GSPG was effective, thereby verifying that the FAHP was reliable. In addition, the proposed method provided a detailed comprehension of the quality evaluation of GSPG and a frame of reference for analogous engineering.

Analysis of the Grinding Characteristics of β-Ga2O3 Crystal on Different Planes

2020 ◽  
Vol 19 (02) ◽  
pp. 235-248
Author(s):  
Hai Zhou ◽  
Jiahui Wei ◽  
Fang Song ◽  
Yongkang Li ◽  
Chuanjin Huang ◽  
...  
Keyword(s):  
Specific Energy ◽  
Grinding Force ◽  
Surface Grinding ◽  
Grinding Wheel ◽  
Experimental Conditions ◽  
Grinding Force Ratio ◽  
Force Ratio ◽  
Grinding Conditions ◽  
Grinding Machine

The (010) and (100) planes of a [Formula: see text]-Ga2O3 crystal were subjected to precision grinding tests with a resin bond diamond grinding wheel on a precision surface grinding machine. The grinding characteristics and surface grinding quality of the planes of the [Formula: see text]-Ga2O3 crystal were analyzed on the basis of grinding force, grinding force ratio, specific energy, and surface morphology. The (010) plane shows a larger grinding force and specific energy but a smaller grinding force ratio compared with the (100) plane. Under experimental conditions, the normal and tangential grinding forces of the (010) plane are 1.4–2.2 and 2.6–7.8 times that of the (100) plane, respectively. The specific energy of the (010) plane is 2.8–6.1 times that of the (100) plane, and the grinding force ratio of the (100) plane is 1.4–3.7 times that of the (010) plane. Under the same grinding conditions, the material removal methods for the two planes are evidently different. The (010) plane is mainly removed by brittle fracture and accompanied by a minimal broken area, whereas the (100) plane is mainly removed by cleavage layering and exhibits numerous block cleavage. The (100) plane is the strong cleavage surface, and the (100) plane demonstrates a higher surface roughness than the (010) plane under the same grinding conditions.

scholarly journals Design of a compact grinding machine

2021 ◽  
Vol 2120 (1) ◽  
pp. 012006
Author(s):  
S Ashvinderjit ◽  
W J Kelvin Chew
Keyword(s):  
Ground Surface ◽  
Preparation Process ◽  
The Public ◽  
Proficiency Levels ◽  
Emery Paper ◽  
Test Parameters ◽  
Cost Efficient ◽  
Grinding Machine ◽  
Coarse To Fine

Abstract The availability and cost of tools are among concerns to the public and industries as key operation device used either for commercial or maintenance purposes such precision grinders or polishing machines are usually expensive. Assorted grinding tools in the market differ in terms of cost, required user proficiency levels and have different tool designs that can lead to limitations of flatness of ground surface and significant vibrations with prolonged use. The aim of this study is to develop a design compact grinder that is able to perform precise grinding and polishing while being cost efficient. Both functionality and ergonomic aspects were taken into consideration with market standards derived from datasheets. An initial design of the grinding machine was made using SolidWorks CAD software. A prototype was subsequently constructed and tested by using typical metallurgical sample preparation process with test parameters of grade of grinding paper and usage of lubricant. Microscopic image of ground specimens showed improvement in the quality of grinding with emery paper grades from coarse to fine grits with lubricant during the grinding process. Moreover, the designed compact grinding machine showed better surface finish when compared to using a typical angle grinder on aluminium sample.

An Investigation of Surface Grinding Characteristics for Titanium Alloy with CBN Wheel

2007 ◽  
Vol 364-366 ◽  
pp. 237-242 ◽  
Author(s):  
Shen Yung Lin ◽  
Y.C. Liu ◽  
C.W. Huang
Keyword(s):  
Titanium Alloy ◽  
Feed Rate ◽  
Surface Grinding ◽  
Depth Of Cut ◽  
Grinding Wheel ◽  
Measuring Instruments ◽  
Grinding Forces ◽  
Grinding Machine ◽  
Work Table

This study performs an experiment to investigate the effect of process variables such as rotational cutting speeds of the wheel, feed rate of the work-table and grinding depth of cut on surface roughness and the fluctuations of grinding forces for Ti-6Al-4V titanium alloy. STP-1623 ADC surface grinding machine, grinding wheel with CBN material sintering and Ti-6Al-4V titanium alloy workpiece are used in the experiment. The roughness of the grinding surface was measured by the roughness measuring instruments and the fluctuations of grinding forces were measured through dynamometer after each surface layer ground from the workpiece in the experiment. The grinding performance can be ascertained from the signal fluctuations phenomena of the grinding forces both along normal and tangential directions, which may also be utilized as an index for the quality of surface finish judgment. The results show that excellent surface quality being always consistent with the stable grinding force fluctuations and can be obtained under the conditions of slow feed rate of the work-table, high revolutions of the wheel and shallow depth of cut.

Study on Inner Cooling Grinding in a General Surface Grinding Machine

2014 ◽  
Vol 496-500 ◽  
pp. 1189-1192
Author(s):  
Ying Hua Liao ◽  
Yong Wang ◽  
Liang Dong Zhang
Keyword(s):  
Surface Grinding ◽  
Cutting Fluid ◽  
Grinding Wheel ◽  
Grinding Temperature ◽  
Fluid System ◽  
Cooling Surface ◽  
General Surface ◽  
Grinding Mechanism ◽  
Grinding Machine

According to inner cooling surface grinding mechanism, a device for inner cooling surface grinding in a general surface grinding machine M7130 is developed. And the device includes there parts, i.e. grinding wheel with radial holes, grinding carriage and cutting fluid system. When grinding, cutting fluid provided by the cutting fluid system is directly sprayed into the grinding zones through the radial holes of the grinding wheel under the action of centrifugal force, and the closure of the grinding zones is destroyed. So the cooling effect of cutting fluid is improved and the grinding temperature is reduced. Further, grinding burn and crack are effectively avoided and the quality of planet grinding is improved. The grinding of difficult-to-machine materials such as Titanium alloy can be realized with the help of general surface grinding machine of the developed device.

Construction Control As A Strategy For Improving The Quality Of Buildings And Structures

2020 ◽  
Keyword(s):  
Quality Control ◽  
Life Cycle ◽  
Construction Control ◽  
Construction Sites ◽  
Actual Problem ◽  
Construction Market ◽  
Construction Products ◽  
Underlying Causes ◽  
Required Quality

In construction production, the safety of constructing buildings and structures is achieved by ensuring the required quality as a result of systematic construction control based on the implementation of a complex of technical, economic and organizational measures at all stages of the object's life cycle. The article deals with the actual problem of improving the quality of construction products-buildings and structures in conjunction with the activities of construction control bodies. The article presents the advanced foreign and domestic experience of ensuring the quality control at the construction sites, providing for the prevention of the underlying causes of defects and increasing the interest of the contractors directly. On the basis of the analysis of the current situation with quality control at the construction market, ways to improve its efficiency by developing a unified system of technological implementation of relevant requirements for the quality of construction products, determining the rational number and business load of construction control engineers, as well as the active activities of self-regulatory organizations in this area are offered.

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