PDF《球铁实用冒口及浇口的设计计算》

3 直接实用冒口与控制压力冒口工艺的浇注系统的计算 这里采用内浇道 横浇道控制的半封闭式浇注系统. 其特点是内浇道能快速凝固, 挡渣效果好. 浇注系 统断面积比为 ∑F 直∶∑F 横∶∑F 内=4∶8∶3. 3.

1 浇注时间 Σp 的确定 根据文献[5 ]提供的图线拟合出如下算式 Σp = 2.

765 W

0 .

445 秒(2.

301 ≤W ≤ 1105) (8) Σp = 206.

31 * 10-

8 .

753 W -

0 .

403 秒(1150 ≤W ≤ 44668) (9) 式中 W 为铸件重量, kg. 3.

2 浇注系统阻流断面(内浇道) 的确定 根据文献[1 ]提供的图线, 得如下拟合的算式: 高的直浇道高度时 F 内=0.

298 + 1.

328 W

0 .

225 (1 ≤W ≤ 100) (10) F 内=0.

2186 *

100 .

773 W

0 .

108 (100 ≤W ≤ 100000) (11) 低的直浇道高度时 F 内=0.

67 + 1.

305 W

0 .

282 (1 ≤W ≤ 100) (12) F 内=0.

179 *

100 .

981 W

0 .

094 (100 ≤W ≤ 100000) (13) 以上各式中 F 内 为内浇道断面积( ∑F 内) , cm

2 ;

W 为阻流浇注铁水重量, kg. 3.

3 内浇道的厚度 应采用薄的内浇道, 以便浇注后尽快冻结, 以免共晶膨胀压力由此卸除. 内浇道也不能过薄, 否则会出 现浇注过程中内浇道的凝固.根据文献[1 ]提供的图线, 得到计算最小内浇道厚度的拟合算式 ?内=41824799e-

0 . 1129T p (14) 式中 ?内 为最小内浇道厚度,mm;

T p 为浇注温度, ℃. 参考文献1卡赛著;

白天申等译. 球墨铸铁的浇口和冒口. 清华大学出版社,

1983 2 李魁盛. 铸造工艺及原理. 北京: 机械工业出版社,

1989 3 国外铸造. 1980, (6)

4 沈阳铸造研究所等. 球墨铸铁. 北京: 机械工业出版社,

1982 4

6 辽宁工学院学报第18 卷第

1 期?1995-2004 Tsinghua Tongfang Optical Disc Co., Ltd. All rights reserved.

5 张 博等著;

任善之等译. 球墨铸铁 基础・理论・应用. 北京: 机械工业出版社,

1985 6 清华大学. 球墨铸铁件浇冒口系统的计算机辅助设计. 交流资料,

1987 7 A FS T rans . 1983,

173 ~

182 D esign and Calculation of the Applied R iser ing and Gating of D uctile Iron Casting Z hang W enliang;

L iu Z h ix in;

X u Y uany ue Key words: ductile iron;

app lied riser;

gating system ABSTRACT Based on som e docum ents available now , the design of the app lied riser and pouring sys2 tem of ductile iron are synthesized new ly. Som e relative app lied graph curves are m athe2 m atically fitted, and a clearly definite designing step s and calculation m ethod are draw n up fo r the design of app lied riser and gating of ductile iron, thereby enabling this design to be fo rm ulated step by step, also m aking the technique sp read m uch conveniently. The calculation fo rm ulae derived in this paper can be referenced fo r the CAD app lication in the m athem atical model . (R eceived on A p r. 9, 1997) (上接第

61 页) 参考文献1〔墨西哥〕 G J Rom á n2 M oguel et al . 气体喷射法精炼铜废料. 铜加工, 1991(4):

168 2 刘兴州. 我国铜加工工业的技术进步

(一). 有色金属加工, 1991, (1):

3 3 G J Rom á n2 M oguel 等. JOU RNAL O F M ETAL S. 1988, (9):

38 ~

40 Research on the I m pur ity Behav iour of the Red- I m - pure-Copper M eng Q ingy ing;

Chang Guow ei;

W ang J ianz hong;

M ao Caiz hu Key words: red2i mpure2copper;

jet2 m etallurgy;

i mpurity behaviour;

coefficient of elonga2 tion;

specific resistance ABSTRACT A pp lying the jet2 m etallurgy technique, the paper m akes a discussion of the affecting regu2 lation upon this kind of copper ′ s coefficient of elongation and the specific resistance in re2 sponse to the to tal amount of the fo resign substance existing in the red2i mpure2copper. In addition, the paper also gives an analysis of all the technique facto rs affecting the i mpurity removal, p ropo ses the removing speed of mo lten copper, definites all key po ints fo r re2 moving i mpurities in the liquid copper. A s a result, the blacken rod exceeds the standard of GB3952-