PL19631B1 - A method of preventing the formation of hard spots or cementite in gray die cast iron. - Google Patents
A method of preventing the formation of hard spots or cementite in gray die cast iron. Download PDFInfo
- Publication number
- PL19631B1 PL19631B1 PL19631A PL1963132A PL19631B1 PL 19631 B1 PL19631 B1 PL 19631B1 PL 19631 A PL19631 A PL 19631A PL 1963132 A PL1963132 A PL 1963132A PL 19631 B1 PL19631 B1 PL 19631B1
- Authority
- PL
- Poland
- Prior art keywords
- formation
- cementite
- gray
- cast iron
- preventing
- Prior art date
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- 230000015572 biosynthetic process Effects 0.000 title claims description 4
- 238000005755 formation reaction Methods 0.000 title claims description 4
- 229910001018 Cast iron Inorganic materials 0.000 title claims description 3
- 229910001567 cementite Inorganic materials 0.000 title claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 238000005266 casting Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 229910001060 Gray iron Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 229910052570 clay Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Description
W odlewnictwie istnieje z dawien daw¬ na dazenie do zastapienia klopotliwych form odlewniczych z piasku i gliny, które trzeba za kazdym razem wykonywac na nowo, stalemi formami z zelaza i stali.Przy niektórych rodzajach odlewów stosowano z powodzeniem formy-kokile, jak np. przy odlewaniu rur w formach wi¬ rujacych, a takze przy przedmiotach wy¬ jatkowo prostych, jak np. odwaznikach i innych. Oprócz tego próbowano, aczkol¬ wiek bezskutecznie, odlewac w kokilach na¬ wet czesci maszyn, podlegajace pózniej¬ szej obróbce. Przed mniej wiecej dwudzie¬ stu laty wykonywano juz równiez formy zeliwne do lania ksztaltek rurowych. Sa¬ mo odlewanie i wyciaganie odlewów z form nie sprawialo wówczas zadnej trudnosci, lecz nie potrafiono unikac czesci twardych, wskutek czego obróbka odlewów byla nie¬ mozliwa.Przedmiotem wynalazku niniejszego jest sposób postepowania umozliwiajacy niezawodnie unikanie miejsc twardych w odlewach, a takze tworzenie sie cementy¬ tu w zeliwie kokilowem szarem. Wynala¬ zek polega na tern, ze w doborze surow¬ ców wybiera sie zawartosc wegla tak niska\ (ponizej 3%) i zawartosc krzemu tak wy¬ soka, aby w ten sposób przeciwdzialac tworzeniu sie cementytu.Z wielkiej liczby wykonanych doswiad¬ czen wynika, ze np. klocki hamulcowe, odlane w kokilach wedlug przepisów Za¬ rzadu Kolei Rzeszy Niemieckiej, posiada¬ ja biale brzegi, wskutek czego sa one bez¬ uzyteczne. Jezeli jednak odleje sie w ten sam sposób klocki hamulcowe z surowca zawierajacego mniej wiecej 2,5% (mniej niz 3%) wegla, i 2,5% krzemu, wówczas nie wykazuja one miejsc twardych.Specjalnie w zastosowaniu do wyrobu klocków hamulcowych, sposób postepowa¬ nia wedlug wynalazku niniejszego przed¬ stawia niezwykle wazny postep w racjonal¬ nej wytwórczosci. PLIn foundry, there is a long-standing desire to replace the troublesome sand and clay casting molds, which must be made anew each time with solid iron and steel molds. In some types of castings, molds have been successfully used, such as in casting pipes in rotating molds, as well as with extremely simple objects, such as, for example, weights and others. In addition, attempts have been made, albeit unsuccessfully, to cast in die even parts of machines which are subject to subsequent processing. More than twenty years ago, cast iron molds for casting pipe shapes were also made. Even casting and removing castings from the molds was not difficult at that time, but hard parts could not be avoided, which made machining of the castings impossible. The subject of the present invention is a procedure that reliably avoids hard spots in castings and also the formation of cements ¬ here in gray cast iron. The invention is based on the fact that, in the selection of raw materials, a carbon content so low (less than 3%) and a silicon content so high as to prevent the formation of cementite are chosen. that, for example, brake blocks, cast in die casts according to the regulations of the Government of the German Reich Railway, have white edges and are therefore useless. However, if brake blocks are cast in the same way from a raw material containing about 2.5% (less than 3%) carbon and 2.5% silicon, then they do not show hard spots. The procedure of the present invention represents an extremely important advance in rational manufacturing. PL
Claims (1)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| PL19631B1 true PL19631B1 (en) | 1934-02-28 |
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