Ảnh hưởng của điều kiện nguội trong khuôn cát tới quá trình đông đặc của vật đúc

Bộ giáo dục đào tạo Tr-ờng đại học Bách khoa hà nội phạm mai khánh ảnh h h-ở -ë -ëng ng cđa ®iỊu ki kiƯn Ưn ng ngii tr tro ong kh khuô uô uôn n cát tớ tớii qu át trình rình đ đông ông đ ®Ỉ Ỉc cđa v vË Ë t ®ó ®óc c Chuyên ngành: công nghệ vật liệu v vô ô M· sè : 62.52.90.01 luËn ¸n tiÕn sÜ kü thuËt Ng-ời h-ớng dẫn khoa học: pGS.TS đinh quảng pgs.TS đào hồng bách Hà Nội 2010                                   PGS.TS , PGS.TS             TS  tin  Xin          x, y, z (m, mm)  x, y, z ( m, mm)  t,  ( h, s)  t ( h, s)  m (kg)   (w/m 0C)  c (J/kg 0C)   ( kg/m 3)  a = /c. (m 2/h, mm 2/s)   (w/m 2.0C)  L (KJ/kg)  Q (J)  q ( J/m 2, J/ mm2)  T ( 0C)  T  (0C)  T Liq (0C)  T Sol (0C)  T kt (0C)  T p (0C)  Tw (0C)  T ( C)  ( mm)    d/dt (mm/s)  dT/dt ( 0C/s)  k (mm/s 1/2 )  Fo = a.t/x  b (w.s 1/2/m2 0C)   (w s1/2 /m2)  P ( kgf, N)   b , Rm (kgf/cm2, MPa)   0,2 , R0,2  A5 (%)  RPT Rapid Prototyping Technology:     nhanh SLA  SLS  LOM   FDM   3DP  QC  MJM Multi Jet Modeling: cng ngh c phun tia vi ht CLA Chandley L  CLV Chandley L       CLAS Chandley L           Trang 28   50   50  51  53  54  55  57  57  57  57 c 62   67   68   69    5 69 70  71   72   72   73   74    79 79    80 80   81    81 87   89   91   92  113  113  113  114   Trang  19  21    22 23    25  26  Si 30 - 13,2% Si 30 - 13,2% Si 31   47   47  59  60  61  64  65   66 66  67  68 123 H d t s  ng   so s vi thn hp kim Silumin Vng gi dng m tng nhi h v  vx = mm, y = 10  t = 0,1s  s dng li sau v H s c nh dt qu  c, i th:     20.0 30.0 32.0 20.0 28.0 32.0 30.0 50.0 56.0 28.0 48.0 54.0 32.0 58.0 64.0 28.0 54.0 60.0 30.0 60.0 68.0 26.0 54.0 62.0 30.0 60.0 68.0 26.0 54.0 62.0 28.0 58.0 66.0 24.0 52.0 60.0 28.0 56.0 64.0 24.0 52.0 60.0 26.0 54.0 62.0 22.0 50.0 56.0 24.0 48.0 54.0 20.0 44.0 50.0 18.0 34.0 40.0 14.0 30.0 36.0 H s c k: 1.81 H s c k: 1.91 124 9.3 T QU T TO  Quy luc  n bin gi silumin: Vc   c  hn h       th  s  bng 1,81  h s  bng 1,91  So vi h s c c t nhi silumin     c ca v  y b u t l  nm    nm  v a v m nhang cng  u ki nm   i cu ki h s c phi phc cu m ca vic gin nhi u [T = T(x,y,t)] T  bi theo chiu cao ca v  chi qua  T c  gn b m t c   thm tip quy lut kt tinh c ca Tchenov  Sau kim lo   c,  lp b mt vt   tinh ln tng  cc b Nhit  125 0 th 35 ( C,  )b  Cs)  t0C;  t tng t5  : C (b 1454 c th 35, sau 0 1449 C (bc th  C, tc t  ngui  lp b m C/s, 0,5 khong thi gian n  t  vn  trng th ang kt tinh sol (T>T ); sau r 77s  tm vt  mi ng c ho ton; tc  ngui  tm vt  khong thi gian s r t 77s n 80s  C/s 1,1 1,50 C/s ; tc  ngui  b mt vt  khong thi gian trn l 0, C/s  1,00C/s -, tc  ngui   vt n hn tc  ngui  b mt Tng t  bc th 35, nhit  cao nht   0 14760C, nh nht l 1433 C; nhit  ca lp b mt cao nht  C, 45 thp nht l 1405 C ;  bc th 40 nhit  cao nht  t  0 14630C, nh nht l 1421 C; nhit  ca lp b mt cao nht  C, 35 0 thp nht l 1394 C; tc  ngui  t 1,2 C/s  1,30C/s,  b mt vt 1,0 C/s  1,10C - tc  ngui  tt n m  c  ngui cc b  u m  ng u, rt d xy ng sut nhi  nhit  ng nhit    tt 126     V ng ca th: Thi gian c chm li, h                  :   h s c ca hp kim silu  t n 1,278; n h 1,602  Cht nhia hn h i gi tr h s c, mch  ph  hn h tinh ci ch  s  thu tinh li hn h V ng ci vc: ng c ng     127      t lo V ng ci v  cha h              2  2  nh:  bn ca m  t lo  bn c i u king  cng c k  V ng ci vi t chc t vi:   silic T ch i ti ch  thu tinh lng u ki cng tn t T ch  thu, ti ch c m  tinh lng 128 nh t chc t vi ca hp kim n  n bng CO tinh ln b    ng chn khng, thy rt Si c  ng ch n khng nh m     t Si ca h  ng ca lc h , nhi  T nhng   thy nhng kt qu mi  u ng ca ngui ti    c ca v ng thng i c l i hn b cng) ca v ng thng i chng Kh y hp kim l  ng thng i chng T chc t vi ca kim lo ng hng thng i chng  nh h s khu  (a) c   kt qu  c c nh Bing nhi ca h tr c c s d   129       c ca v  ng nhi h v   s dng nhng kt qu     c ti ng hp mun ci thinh, t chc t vi ca v c ca vc ch ng li m  n trc bi c nhi xn xut troc s dng Hon ch thng dc (hiu qu   rt nh      c c c thuyc  ngh, s t c n tinh t   i t ngui ng th loi tr c khuyt t i vi v     Tin h r hp kim kh vi hp kim nhm c tinh (v d nh th khng g) c loi khun  n  x nh hng ca vt liu k i vi vt liu vt  kh chng t s ph hp gia t to v nghim  n  chng v trang 127 T  rng phc c nh tin cy ca nhi  130 t nhia vt li ng nhi h vn c c     c gi    i chng v        tu u kin p Kt hp v    thm kh ng, t  tn nhi  lu          t lp t i v chuy  c nh  ng v kinh t 131                84  89         -124                       132    38   10    -157 11     12        21 13 Lm Hng Minh (2009): Nghi  CN m  - 14      15    133 16        pp 136  140  17 Dao Hong Bach (2005): Studing Thermal Conduction Ability of Mold Coating on Real Congditon, Proceedings of the ninth Asian Foundry Congress Vietnam Foundry and Metallurgy Sci & Tech Association October,15-18, Hanoi 18 Bates C.E (1992).:Accuracy and Precision of Iron and Aluminium Casting Made by EPC, No-bake and Green Sand Methods AFS Trans Vol.100, pp 323  335 19 Byron Bird R et all (2000): Transport Phenomena John Wiley & Sons  20 Kantorovich L.V et all (1964): Approximate Methods of Higher analysis Interscience Publishers, Inc New York 21 Pham Van Khoi, Dao Hong Bach, Nguyen Khai Hoan, Nguyen Van Bang (2002): Study on the Solidification process of Casting by mathematical and physical models Seminar on Foundry and Metallurgy Vietnam-Korea Hanoi, Lecture No.8 22 E Longnecker, K Kanoh, J Fukuya (Jun 1998) High Production Quality Iron Casting in Japan : Factors for good Evaporative Foam Process Performance Proceedings of AFS Conference on Evaporative Foam Casting Technology III 23          24 R.W Ruddle (1957): The Solidification of Casting The Institute of Metals, London 134 25 Yogesh Jaluria et all (2003): Computational Heat Transfer Taylor & Francis New York London  26  27   N0.1 pp 29-35 28        Moskva 29 Krzhizhahovskiy R.E et all (1973): Teplofizicheskie svoistva nemetallicheskikh  30 Zhukovskiy S.S (1989): Prosch    Moskva  31  -381 32 Pham Van Khoi (1983): Matematicko-          33   di 34        Brno 35         135         Budejovice, pp 148  181 36    37   38    39           40                    jinshu cailiao shouce 41   42           43   NXB  44  n kh          gongyi yu shiyan jishu ) MỤC LỤC  1   11  20  29  44  51  58  69   (ADC12) 79  79  89  96  105 C 114 C 123 C 130 C  136    142  142  149    156 162 ...  ? ?quá trình hình thành gang trắng gang xám  trường độ cứng bề mặt vật đúc gang   trường nhiệt độ hệ vật đúc /khuôn đúc ... cơng nghệ đơng đặc có hướng    ? ?đông đặc nguội sâu, đông đặc siêu đặc biệt  ...  tác dụng trực tiếp vào vật đúc  Tr liên kết hạt vật liệu khuôn rời rạc  