scholarly journals Study on abrasive particle impact modeling and cutting mechanism

2021 ◽  
Author(s):  
Mingfei Mu ◽  
Long Feng ◽  
Qiang Zhang ◽  
Wanshun Zang ◽  
Haixia Wang
Keyword(s):  
Abrasive Particle ◽  
Particle Impact ◽  
Cutting Mechanism

Sand Erosion Performance of Gradient Ceramic Nozzles by Abrasive Air-Jets

2006 ◽  
Author(s):  
Jianxin Deng
Keyword(s):  
Wear Resistance ◽  
Abrasive Particle ◽  
Particle Impact ◽  
Erosion Wear ◽  
Apparent Increase ◽  
Air Jets ◽  
Air Jet ◽  
Sand Erosion ◽  
The Common ◽  
Compressive Residual Stresses

A SiC/(W,Ti)C ceramic nozzle with gradient structures was produced by hot pressing. The purpose is to reduce the tensile stress at the entry region of the nozzle in abrasive air-jet. The sand erosion performance of this kind gradient ceramic nozzle caused by abrasive particle impact was investigated by abrasive air-jets in comparison with the common one. Results showed that the gradient ceramic nozzles exhibited an apparent increase in erosion wear resistance over the common ceramic nozzles. The mechanism responsible was explained as the formation of compressive residual stresses in nozzle entry region in fabricating process of the gradient ceramic nozzles, which may partially counteract the tensile stresses resulting from external loadings. It is indicated that gradient structures in ceramic nozzles is an effective way to improve the erosion wear resistance of common ceramic nozzles.

In-Plane Longitudinal Cutting in Single-Crystal Silicon Wafer Surface Micromachining

2017 ◽  
Vol 261 ◽  
pp. 93-100
Author(s):  
Ronald Allan S. de los Reyes
Keyword(s):  
Silicon Crystal ◽  
Abrasive Particle ◽  
Silicon Wafers ◽  
Wafer Surface ◽  
Surface Layers ◽  
Cutting Mechanism ◽  
Spherical Cap ◽  
Appreciable Change ◽  
Polymorphic Transitions ◽  
Longitudinal Cutting

The current concept of grinding or abrasive machining involves the formation and removal of segmented strips of material termed chips from the surface of the solid. A novel cutting mechanism is hereby presented in this research study that suggests that the generation of chips from the surface does not occur but only a shearing process that splits material creating added surface features and textures in the silicon surface. This arises from the unique set of factors of abrasive grit size, thrust force, polishing speed, and polishing time that lead to phase transformations in the surface layers of the silicon wafers. Statistical analysis of the factor effects yielded results that show the surface roughness values, Ra and Rz, increasing without any appreciable change in the thickness of the silicon wafers. This can be attributed to the proposed cutting mechanism indicating that only in-plane surface shearing occurred due to the change of the silicon crystal structure from exhibiting brittle behavior to that of ductile mode of deformation. Moreover, experimental quantities of the specific energy for surface machining of silicon was calculated with an overall mean of 50.5 GPa. This is about 33% less than the currently accepted value and can be considered further evidence that polymorphic transitions to a softer material occurred rendering the surface layers more susceptible to longitudinal cutting deformation and fracture. A model based on the inverted spherical cap or spherical bottom geometry for the individual abrasive particle is also proposed, verified by a finite element method analysis simulation, that can mathematically describe this particular micromachining process.

scholarly journals Statistical model of metal removal removed from product surface under the influence of abrasive particle flow

2020 ◽  
Vol 210 ◽  
pp. 08005
Author(s):  
Georgi Tzordanidi ◽  
Oksana Pyatnitzkaya ◽  
Elena Fisunova ◽  
Tatyana Lavrenova ◽  
Olga Baryshnikova
Keyword(s):  
Statistical Model ◽  
Metal Removal ◽  
Abrasive Particle ◽  
Particle Flow ◽  
Particle Impact ◽  
Metal Volume ◽  
Product Surface ◽  
Plastic Displacement ◽  
Random Nature ◽  
Free Abrasive

A model is proposed that describes the forming processes of metal volume removed from the product surface during processing with a free abrasive flow, taking into account the random nature of abrasive particle impact on the surface and the possibility of implementing acts of elastic and plastic displacement of material or micro-cutting.

scholarly journals Study On Abrasive Particle Impact Modeling And Cutting Mechanism

2021 ◽  
Author(s):  
Long Feng ◽  
Qiang Zhang ◽  
Mingchao Du ◽  
Wanshun Zang ◽  
Haixia Wang
Keyword(s):  
Numerical Model ◽  
Abrasive Particle ◽  
Local Deformation ◽  
Rigid Bodies ◽  
Abrasive Waterjet ◽  
Particle Impact ◽  
Abrasive Particles ◽  
Waterjet Cutting ◽  
Abrasive Waterjet Cutting ◽  
The Impact

Abstract Abrasive particles play a vital role in the impact on materials during abrasive waterjet cutting. To study the effect of particles on the cutting performance during abrasive waterjet cutting, the mostly irregular shape of the abrasive particles in the actual cutting process needs to be considered. In this paper, the particles are simplified as angular and circular particles. The method of Smoothed Particle Hydrodynamics (SPH) is used to simulate the process of particle impact targeting in abrasive jet cutting. Because the abrasive particle impact causes a large local deformation or removal of the surface of the target material, the traditional grid-based numerical method is not suitable for such problems; thus, the SPH method, which is suitable for the impact problem, is selected to establish the numerical model and solve it. In this paper, the fracture process of abrasive particles with different shapes of impact ductility and brittle target materials is studied by a numerical model. In the modeling process, abrasive particles are modeled as rigid bodies with material properties, the ductile materials is an aluminum alloy, the brittle material is quartz glass, which are simulated by changing the initial input conditions and particle shape, and the model is verified by experiments. The results show that the model successfully reproduces the collision process of particles during abrasive jet cutting, including the deformation mechanisms of plowing, fracture and crushing of the target.

scholarly journals The Surface Condition of Ni-Cr after SiC Abrasive Blasting for Applications in Ceramic Restorations

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5824
Author(s):  
Weronika Czepułkowska-Pawlak ◽  
Emilia Wołowiec-Korecka ◽  
Leszek Klimek
Keyword(s):  
Surface Condition ◽  
Abrasive Particle ◽  
Surface Profile ◽  
Abrasive Particles ◽  
Dental Restorations ◽  
Large Width ◽  
Ceramic Restorations ◽  
The Impact ◽  
Abrasive Size ◽  
Abrasive Blasting

Abrasive blasting is a process widely used in dentistry. One of the uses is the development of metal surfaces for connections with ceramics in fixed prosthetic restorations. The purpose of this paper was to check how the rough surface profile (width, height, and depth on unevenness) impacts the surface’s condition, like its wettability and percentage of stuck abrasives. The Ni-Cr alloy surface was abrasive blasted by silicon carbide with the various pressure parameters (0.2, 0.4, and 0.6 MPa) and abrasive particle sizes (50, 110, and 250 µm). Cleaned surfaces were examined for roughness, wettability, and percentage of stuck abrasive particles on the surface. The surface after abrasive blasting using 110 µm of abrasive size and 0.4 MPa pressure has the best wettability results. The width of unevenness may cause it. When the unevenness has too small or too large width and depth, the fluids may not cover the entire cavities because of locking the air. The surface condition of dental alloys directly affects metal–ceramic connection strength. The knowledge about the impact of the abrasive blasting parameters on the bond strength will allow one to create durable dental restorations.

Prediction of particle distribution and particle impact erosion in inclined cavities

2017 ◽  
Vol 305 ◽  
pp. 562-571 ◽  
Author(s):  
Zhe Lin ◽  
Yifan Zhang ◽  
Yi Li ◽  
Xiaojun Li ◽  
Zuchao Zhu
Keyword(s):  
Particle Distribution ◽  
Particle Impact ◽  
Impact Erosion

The Technical Development for Increasing ROP with Particle Impact Drilling in China

2014 ◽  
Vol 904 ◽  
pp. 292-295 ◽  
Author(s):  
Jian Zhao ◽  
Yi Ji Xu
Keyword(s):  
Field Test ◽  
Hard Rock ◽  
Rock Breaking ◽  
Particle Impact ◽  
Sound Effect ◽  
Deep Well ◽  
Working Principle ◽  
Hard Formation ◽  
Field Test Result ◽  
Test Result

Field test of particle impact drilling (PID) technology was firstly carried out in deep well and hard formation in Sichuan province china on Oct. 2013. The test formation was named Xu Jiahe, which was very difficult to penetration. Field test result shows that the ROP (rate of penetration) was nearly doubled by this technology. It indicates that there is a profound application prospect of particle impact drilling, especially for hard rock formation. In this paper, the equipment and working principle was analyzed. The experiment and simulation results showed that the rock breaking efficiency was highly increased by this technology. The details of this field test were presented too in this paper that proved the sound effect of PID.

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