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首页> 外文期刊>Wear: an International Journal on the Science and Technology of Friction, Lubrication and Wear >Effect of entrained air in abrasive water jet micro-machining: Reduction of channel width and waviness using slurry entrainment
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Effect of entrained air in abrasive water jet micro-machining: Reduction of channel width and waviness using slurry entrainment

机译：磨料射流微加工中夹带空气的影响：使用浆料夹带减少通道宽度和波纹度

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摘要

The erosion produced by abrasive water jets is a result of the complex interaction of the three-phase jet (water-air-abrasive) and the target. The objective of the present work was to isolate the effect of the entrained air in abrasive water jet micro-machining (AWJM) by comparing milled surfaces made by AWJM with those produced by high-pressure slurry jet micro-machining (HASJM) while maintaining a constant particle velocity. An existing model developed for abrasive particle velocities in AWJM was modified and used to predict the particle velocity in HASJM, and then verified using a double disc apparatus (DDA). The model allowed prediction of the conditions required to achieve average particle velocities of similar to 255 m/s using the two systems with the same 38 mu m garnet particles. Under this condition of equal particle velocity, there was a very large reduction in the centerline waviness, W-a, of microchannels made in SS316L and A160661-T6 using HASJM; typically 3.4 times smaller waviness than found in channels made with AWJM using the same dose of particles. This was found to be mainly due to the much larger variation in abrasive flow rate in AWJM brought about by the air/particle entrainment system, rather than any fundamental change in erosion mechanism due to the impact of the non-homogeneous three phase air/particle/water in AWJM. The centerline roughness, R-a, was approximately the same in both processes at a traverse velocity of V-t = 4572 mm/min and a nozzle angle of 90 degrees. For both processes, Wa and Ra increased with an increase in pressure and abrasive particle dose, and decreased with an increase in nozzle angle. For micro-channels of a given depth, the widths of those made with HASJM were 26% narrower than those produced with AWJM, mainly due to the wider jet that resulted from the entrained air in AWJM, again at the same particle velocity. The erosion rate in HASJM was found to be about 27% lower mainly because of a smaller width of micro-channels in HASJM. (C) 2015 Elsevier B.V. All rights reserved.
机译：磨料射流产生的腐蚀是三相射流（水-空气磨料）与靶材之间复杂相互作用的结果。本工作的目的是通过比较AWJM制成的铣削表面与高压泥浆喷射微加工（HASJM）产生的铣削表面，以隔离夹带空气在磨料水喷射微加工（AWJM）中的影响，恒定的粒子速度。修改了为AWJM中磨料颗粒速度开发的现有模型，并将其用于预测HASJM中的颗粒速度，然后使用双盘设备（DDA）进行了验证。该模型允许使用两个具有相同38微米石榴石颗粒的系统预测达到255 m / s的平均颗粒速度所需的条件。在相同的粒子速度条件下，使用HASJM在SS316L和A160661-T6中制造的微通道的中心线波纹度W-a大大降低;通常，波纹度是使用相同剂量颗粒的AWJM通道中发现的波纹度的3.4倍。发现这主要是由于空气/颗粒夹带系统在AWJM中引起的磨料流速变化大得多，而不是由于非均相三相空气/颗粒的影响引起的腐蚀机理的任何根本变化。 / AWJM中的water。在两个过程中，中心速度粗糙度R-a在V-t = 4572 mm / min的横向速度和90度的喷嘴角度下大致相同。对于这两个过程，Wa和Ra随压力和磨料颗粒剂量的增加而增加，而随喷嘴角度的增加而减小。对于给定深度的微通道，使用HASJM制成的通道的宽度比使用AWJM制成的通道的宽度窄26％，这主要是由于同样在粒子速度下，AWJM中夹带的空气导致了更宽的射流。发现HASJM中的侵蚀率降低了约27％，这主要是因为HASJM中的微通道宽度较小。 （C）2015 Elsevier B.V.保留所有权利。

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