Bài viết trình bày thực nghiệm, lựa chọn hợp lý các thông số hình dạng hình học mảnh dao hợp kim cứng chế tạo tại Việt Nam để đảm bảo độ nhám bề mặt và độ chính xác kích thước hình học khi tiện chi tiết thép không gỉ SUS304 có biến dạng cong lồi trên máy tiện CNC.
037-043 B i Ng c Tuyên1*, Nguy n Ch Công1,2 Công ty TNHH MTV H a ch t 21 - Th x Ph Th , t nh Ph Th 2-11- -02-2017 T mt t B i b o tr nh b l a ch n h p l nh d ng h nh h c m nh dao h p kim c ng ch t o t i Vi t Nam (b n k nh m i dao r, g c , g c sau , g c nâng mb o nh m b m t v ch nh x c k c h nh h c ti n chi ti t th p không g SUS304 c biên d ng cong l i m y ti n CNC nh gi m ng c nh h c d ng c c iv nh m b m t, v ch nh x c k ch t g c c m ng l n nh t, ti p n l b n k nh m i dao r, g c sau v cu i c ng l g c nâng Qua phân tích, th o lu n c h nh d ng h nh h c m nh dao h p kim c ng ph nh m b m t v xác k c (-5o), g c sau o o o (12 ), b n k nh m i dao r (0,4mm), g c nâng -6 ), g c nghiêng ch nh 93 ), g c m i dao 35o) T kh a: Th p không g nh m b m t (Ra), T s S/N, Phân t Abstract This paper presents an experimental study for selecting the appropriate geometrical parameters such as of carbide insert, which is made in Viet nam, to ensure best surface roughness and dimensional accuracy contour turning SUS304 stainless steel with convex curved profile on the CNC lathe Method of experimental design and analysis of variance shuch as Taguchi and ANOVA were used to assess the influence level of the geometric parameters of cutting tools on the two targets The study results shows that for the surface roughness and the dimensional accuracy, assessed by the deviation of the machining diameter compared with the design diame he the greatest influence level, Followed by, the contribution percentages for the nose radius r, the finds out the optimized parameters to achieve the best surface roughness and dimensional accuracy o), the nose radius r (0.4 mm),the simultanously -5o o o -6o ), the nos ) Keywords: Stainless steel, Surface roughness (Ra), Signal to Noise (S/N), Analysis of variance (ANOVA) * * Tel: (+84) 904180428 Email: tuyen.buingoc@hust.edu.vn 037-043 o o o o 2.1 V t li u, d ng c , thi t b th nghi m V t li u: b (MPa) o o c (MPa) (%) (%) (HVmax) 037-043 Thi t b : , (%) max max max M nh m: , (%) a y max a d (g/cm3) M u th nghi m: u (MPa) (HRA) 2.2 Nghiên c u, l a ch n c c thông s h nh h c m nh dao h p kim c ng ( tr ng th i t nh) -0,05 D ng c c t: o o o o o 037-043 o i o e o T A B C o A A T B B T C C T e e T 2.3 Thi t k th nghi m Taguchi o n MSD j n xj j x0 037-043 TT B ng tr c giao r RaTB S/NRa (mm) 10 0.2 -6 1.385 -2.8290 0.0510 25.8486 10 0.2 -6 1.367 -2.7154 0.0505 25.9342 10 0.2 -6 1.371 -2.7407 0.0513 25.7977 12 0.4 1.227 -1.7769 0.0341 29.3449 12 0.4 1.203 -1.6053 0.0327 29.7090 12 0.4 1.231 -1.8052 0.0312 30.1169 14 0.6 1.113 -0.9299 0.0437 27.1904 14 0.6 1.112 -0.9221 0.0432 27.2903 14 0.6 1.117 -0.9611 0.0414 27.6600 10 -5 10 0.4 1.019 -0.1635 0.0350 29.1186 11 -5 10 0.4 1.013 -0.1122 0.0311 30.1448 12 -5 10 0.4 1.012 -0.1036 0.0330 29.6297 13 -5 12 0.6 -6 0.933 0.6024 0.0213 33.4324 14 -5 12 0.6 -6 0.862 1.2899 0.0242 32.3237 15 -5 12 0.6 -6 0.901 0.9055 0.0211 33.5144 16 -5 14 0.2 1.127 -1.0385 0.0411 27.7232 17 -5 14 0.2 1.122 -0.9999 0.0392 28.1343 18 -5 14 0.2 1.112 -0.9221 0.0363 28.8019 19 -10 10 0.6 1.397 -2.9039 0.0513 25.7977 20 -10 10 0.6 1.391 -2.8665 0.0524 25.6134 21 -10 10 0.6 1.397 -2.9039 0.0532 25.4818 22 -10 12 0.2 1.313 -2.3653 0.0573 24.8369 23 -10 12 0.2 1.282 -2.1578 0.0533 25.4655 24 -10 12 0.2 1.243 -1.8894 0.0521 25.6632 25 -10 14 0.4 -6 1.112 -0.9221 0.0432 27.2903 26 -10 14 0.4 -6 1.113 -0.9299 0.0423 27.4732 27 -10 14 0.4 -6 1.125 -1.0231 0.0441 27.1112 T ng -34.789 756.448 a 037-043 a mm a 2 o 2 o o o 2 o o o mm) -0,05 (mm) (o) a (o) o () (o) (o) 037-043 [9] [10] [11] [12] [13] [14] [15] [16] o o o [17] [18] d ch) (1981), S ch tra c u ch gia công, NXB KHKT, H N i , c t c c v t li u kh go (2006), , MOCKBA MA HOCTPOEH E Sandvik Coromant (2010), Technical guide Metal cutting tochnology David A Stephenson,John S Agapiou, Metal Cutting Theory and Practice, Taylor & Francis Group, 2006 ng (2007), Nghiên c nh ch c tt t tr máy ti n CNC, Lu n n ti n s N i a trình c t g t ti ng ch y dao l n, Lu n n ti n s N i Nguy n Th 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(%) a y max a d (g/cm3) M u th nghi m: u (MPa) (HRA) 2.2 Nghiên c u, l a ch n c c thông s h nh h c m nh dao h p kim c ng ( tr ng th i t nh) -0,05 D ng c c t: o o o o o 037-043 o i o e o T A B... Vi t (2007), S tay công ngh ch t o m y, NXB KHKT, H N i Nguy n Th n Th L c, Lê Thanh ng d n thi t k d ng c c t kim lo i, NXB GDVN Nguy n Vi t Ti p (1997), Nghiên c u t nh gia công c a v t li u... dao l n, Lu n n ti n s N i Nguy n Th Qu c Dung (2012), Nghiên c u qu tr nh ti n th p h p kim qua b ng dao PCBN, Lu n n ti n s N i Nguy n Ng c Kiên (2013), ng d p tr tu nhân t o v phân t x nh