Experimental Study on the Micro-scale Grinding Force of High-Entropy Alloys

doi:10.12068/j.issn.1005-3026.2024.12.008

Abstract

Abstract:

By analyzing the formation mechanism of grinding chips， a theoretical model of micro‑grinding force of high‑entropy alloys was established， and the formula of grinding force was derived. Through orthogonal and single‑factor experiments， the influencing laws of grinding parameters， particle sizes and surface coating of micro‑grinding tools on the grinding force were explored， as well as the grinding force comparison of different high‑entropy alloys. The effects of grain size， processing parameters and grinding force on the morphology of grinding chips were analyzed. The results showed that the feed speed has the greatest effect on grinding force and the least effect on grinding depth. With the increase of feed speed and grinding depth， the grinding force gradually increases， and the grinding force gradually decreases with the increase of grinding speed. The micro‑grinding force of the 500# abrasive particle is larger， and the grinding chips produced are bar spacing sawteeth. The tangential grinding force of the coated microabrades is smaller than that of the uncoated microabrades， while the normal grinding force is larger. The increase of Al content and the addition of Mo element will lead to the increase of the micro‑grinding force. Finally， the calculated values of the theoretical model were compared with the experimental values， and the accuracy of the micro‑grinding force model was verified.

Key words: high?entropy alloy, micro?scale grinding, grinding force, abrasive debris

CLC Number:

TH 161

Xue-long WEN, Hong-ze GUI, Ya-dong GONG, Meng-shan WANG. Experimental Study on the Micro-scale Grinding Force of High-Entropy Alloys[J]. Journal of Northeastern University(Natural Science), 2024, 45(12): 1734-1743.

Figures/Tables 27

Fig.1 Interaction between a single abrasive particle and the workpiece surface

Fig.2 Minimum cutting thickness effect

Fig.3 500# microabrasives produced abrasive debris

Fig.4 200# microabrasives produced abrasive debris

Fig.5 Debris morphology at different grinding speeds

Fig.6 Effect of grinding speed on chip pitch

Fig.7 Schematic diagram of grinding process

Fig.8 Modeling of grinding force for sphere abrasive

Fig.9 Grinding force modeling of conical grinding particles

Fig.10 JX-1A precison grinder

Fig.11 Grinding force signal testing system

Fig.12 Microabrasive tool topography

Table 1 Orthogonal experiment scheme

因素	水平
因素	1	2	3	4	5
v_s/（m·s^-1）	0.942	1.414	1.885	2.356	2.827
v_w/（μm·s^-1）	20	40	70	100	200
a_p/μm	3	6	9	12	15

Table 2 Single factor micro‑grinding test scheme

0.942，1.414，

1.885，2.356，2.827

1.414

20，40，70，100，200

1.414

3，6，9，

12，15

Fig.13 Micro‑grinding force range diagram

Fig.14 Micro‑grinding force variance diagram

Fig.15 Effect of grinding speed on grinding force

Fig.16 Effect of grinding depth on grinding force

Fig.17 Effect of feed speed on grinding force

Fig.18 Effect of coating on grinding force at different feed speeds

Fig.19 Effect of coating on grinding force when grinding speed changes

Fig.20 Influence of different materials on grinding force

Fig.21 Influence of grain size on grinding force when grinding speed changes

Fig.22 Influence of grain size on grinding force when feed speed changes

Fig.23 Influence of grinding force on grinding chips at different particle sizes

Fig.24 Influence of grinding force on grinding chips at different grinding speeds

Fig.25 Comparison of experimental and theoretical values at different grinding speeds

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