球狀石墨鑄鐵二次接種對球化效果之影響

Effects of Casting Secondary Inoculation on Nodularity of Ductile Iron

高德仰(Te-Yang Kao)

指導教授 ： 陳適範 ； 林於隆

國立臺北科技大學/工程學院/材料科學與工程研究所/碩士(2010年)

https://doi.org/10.6841/NTUT.2010.00413

摘要

本研究之主要目的是探討使用不同方式接種得到品質穩定的生產製程，改善工件品質。為了延長接種處理有效作用時間，對斷面尺寸較大的鑄件或澆注延續時間較長時，在臨澆注前再進行一次接種處理，這就是二次接種。由實驗結果得知二次接種的方法是在澆注一半量時，使用總接種劑的30%的接種劑約2kg做二次接種，得到的鑄件品質均能達到抗拉強度450MPa。由於抗拉強度均能達到要求，加工後的齒輪工件齒部位不易斷裂。 在鑄造過程中澆注温度的控制、開箱時間配合及配料使用Mn、Ba等材質均能調整球狀石墨鑄鐵的基地組織，是促進波來鐵組織，以達成布氏硬度190HB以上。 由於硬度的增加改善齒輪工件的耐磨性，增長紡織機的使用壽命。二次接種可以單獨以矽鐵做接種劑，但以鈣矽、矽鐵-鋁、矽鐵-錳鐵、矽鐵-錳鐵-鋁..等，做覆合接種效果更好。第二次接種的接種劑粒度也應適當減小，以小於5毫米為宜。來改善佰龍公司協力工廠生產過程中種穩定品質。

關鍵字

接種劑 ； 球化率 ； 二次接種

並列摘要

In order to increase the effect of inoculation on nodular cast iron.
When we make the large section of nodular iron castings or to delay the periods of the cast nodular iron. We must do again inoculation before pouring, this is what we called Secondary Inoculation.
According to the result of the experiment, we realized that if the secondary inoculation is being made during half of the pouring procedure by using 30% of the inoculants, we will get the excellent qualities of 80% nodularity and 450 MPa of tensile strength.
During the casting process, we usually use Mn, Ba to make the proliferation of pearlite. Besides, the cooling rate and the time of opening container can result in more quantities of pearlite, and increase the Brinell hardness.
The tooth angle of gear is not easily to breakdown because of the improvement of tensile strength.
The tooth surface of gear is not easily to wear down due to the increase of the
iii
hardness, and extend the usage of textile machine.
The secondary inoculation is too close to pouring the effect of inoculation is very enough to improve graphite type of the nodular cast iron. That is mean the graphite quantify, size is increase more than not added, the mechanical prosperity of nodular cast iron can improve very much.
The secondary inoculation material compose of many Fe-Si to make it, but Ca-Si, Fe-Si-Al, Fe-Mn, Fe-Si ect. If we can use these component are good for inoculation.
After Mg treated and inculated are over the pouring temperature will be reduced about 100℃. So the secondary inoculation quantity only few is enough to do it, we must control the size and quantify of inoculants generally speaking: Fe-Si, 0.2∼0.4% ;Fe-Mn, 0.2∼0.4% ;CaSi 0.2% ;Al0.04∼0.08% are enough to do. The recovery of inoculation are according the methods of treating.
Many nodualar cast iron foundry adopt this way to make good mechanical property of nodular cast iron.

並列關鍵字

Secondary Inoculation ； Inoculants ； Nodularity

參考文獻

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