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A study on the surface grinding process of the SUJ2 steel using CBN slotted grinding wheel
Using slotted grinding wheel in machining is a new approach in grinding technology. The slotted grinding wheel is used to improve the introduction of cool lubricant into the cutting zone, improve chip release condition and heat release condition during machining, thereby facilitating to improve the efficiency of the grinding process. However, up to now, the studies that are performed using this type of grinding wheel is very limited. To contribute some results to this rather new research direction, in this article we present the grinding process of SUJ2 steel using CBN slotted grinding wheel. The orthogonal Taguchi matrix with nine experiments was used to design the experimental matrix with three input parameters including workpiece velocity, feed rate, and depth of cut. The output parameters that were used to evaluate the quality and effectiveness of the grinding process were surface roughness, system vibrations in X, Y, Z directions, and the material removal rate. In surface grinding process using CBN slotted grinding wheel, all three input parameters (workpiece velocity, feed rate, and depth of cut) have a significant influence on the surface roughness, vibration. In which, the feed rate has the most influence on the output parameters. The second factor that influenced on the output parameter was the depth of cut. The workpiece velocity has the smallest influence on the output parameters. Data Envelopment Analysis Based Ranking (DEAR) method was used to solve the multi-objective optimization problem in surface grinding process. By applying this method, the optimal value of input parameter that were determined to obtain the minimum values of surface roughness and system vibration components, and to obtain the maximum of material removal rate. The optimum values of input parameters were the workpiece velocity of 15 m/min, the feed rate of 4 mm/stroke, and cutting depth of 0.015 mm. DEAR method can be applied to improve the quality and the effectiveness of the grinding process by reducing the surface roughness and system vibration components and increasing the material removal rate.
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An experimental investigation on surface layer damage in high-efficiency and low-damage grinding of rail by slotted CBN grinding wheel | The International Journal of Advanced Manufacturing Technology
Rail grinding is an important part of rail maintenance. However, the processing efficiency of rail grinding by corundum grinding wheel is low due to the limitation of grinding thermal damage. In this work, a slotted single-layer brazed CBN grinding wheel is used to repair the rail surface replacing corundum grinding wheel, because the CBN abrasive has better heat conduction performance, and the slot structure can reduce the heat transferred workpiece. The influence of grinding parameters on the grinding forces, temperature, ground surface quality (e.g., surface roughness, surface microstructure, subsurface hardness, and subsurface damage) is investigated compared with the corundum grinding wheel. Results showed that the slotted single-layer brazed CBN grinding wheel possesses a better surface roughness and lower surface damage depth and can improve the grinding efficiency of the rail by seven times.
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Experimental Study on Creep Feed Deep Grinding Titanium Alloy with Slotted CBN Grinding Wheel | Scientific.Net
In order to improve the grindability of titanium alloys, the inhibition of chemical affinity between abrasives and titanium alloys and cooling enhancement in grinding zone are carried out in this paper. Slotted electroplated CBN grinding wheels with optimum topography are used, and different grinding fluid supply systems such as conventional tangential spraying coolant supply, inner chamber coolant jet impingement, radial high-pressure coolant jet impingment are employed in creep feed deep grinding experiments on titanium alloy (TC4). The experimental results show that high-pressure jet impingement has remarkable cooling effect. The temperature of the workpiece surface can be steadily kept below the critical film boiling temperature 120~130°C, while the workpiece surfaces is badly burnt with conventional coolant supply. The study will exploit an important research orientation that has great potential in high efficiency grinding. Further perfection of this study will not only enable us to increase the available material removal rate to a new level but also solve the workpiece burn problem of the difficult-to-machining materials in high efficiency grinding.In order to improve the grindability of titanium alloys, the inhibition of chemical affinity between abrasives and titanium alloys and cooling enhancement in grinding zone are carried out in this paper. Slotted electroplated CBN grinding wheels with optimum topography are used, and different grinding fluid supply systems such as conventional tangential spraying coolant supply, inner chamber coolant jet impingement, radial high-pressure coolant jet impingment are employed in creep feed deep grinding experiments on titanium alloy (TC4). The experimental results show that high-pressure jet impingement has remarkable cooling effect. The temperature of the workpiece surface can be steadily kept below the critical film boiling temperature 120~130°C, while the workpiece surfaces is badly burnt with conventional coolant supply. The study will exploit an important research orientation that has great potential in high efficiency grinding. Further perfection of this study will not only enable us to increase the available material removal rate to a new level but also solve the workpiece burn problem of the difficult-to-machining materials in high efficiency grinding.
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A study on the surface grinding process of the SUJ2 steel using ...
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Research Progress of Abrasive Groups Ordered Grinding Wheels | Chinese Journal of Mechanical Engineering | Full Text
Because the grinding temperature is high when grinding using conventional disordered grinding wheels, the grinding quality improvement is limited when using single abrasive ordered grinding wheels, and the wheel preparation process is complex and costly when using microstructured grinding wheels, abrasive groups ordered grinding wheels are widely investigated. However, there is a paucity of systematic analyses and comprehensive reviews focused on abrasive groups ordered grinding wheels. Therefore, this paper defines abrasive groups ordered grinding wheels and classifies them, based on their unique characteristics, into groups such as abrasive blocks ordered grinding wheel, fine grain structured grinding wheel, abrasive clusters ordered grinding wheel, and abrasive fibers ordered grinding wheel. We provide an overview of the latest advances in wheel structures, preparation methods, and abrasive selection for various types of abrasive groups ordered grinding wheels. Furthermore, we conduct a comparative analysis of the existing types, significant advantages, and challenges associated with the four types of abrasive groups ordered grinding wheels. Looking ahead, given the potential of abrasive groups ordered grinding wheels in reducing grinding force and temperature, we recommend further exploration of their application in combination with special processing techniques. This could pave the way for the development of machining processes that are more environmentally friendly, energy-efficient, and precise.
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