頁籤選單縮合
題 名 | 高壓造模之起模性分析=Analysis of Drawing and Moldability of High Pressure Sand Molding |
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作 者 | 張晉昌; 孫龍生; | 書刊名 | 鑄工 |
卷 期 | 24:2=97 1998.06[民87.06] |
頁 次 | 頁1-11 |
分類號 | 472.22 |
關鍵詞 | 模穴完整率; 起模斜度; 起模方式; 震動擠壓造模機; The soundness of mold cavity; Draft; Jolt and squeeze molding machine; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究以矽砂做為基砂, 配上常用的添加劑(鈉膨潤土、煤粉、纖維素或糊精) 及砂心砂( CO �祝漶B�K喃樹脂砂、殼模吵或加熱殼模砂),配製成為 8 種濕模砂, 再分 別以 4 種不同混練時間加以混練,而得 32 組樣本砂。 每組樣本砂均控制壓縮比在 43 ± 2 %,然後分別測試模砂性質:水份含量、抗剪強度、抗壓強度,再以震動擠壓造模機以 A 、B、C 三種模板造模,採頂升式及下沉起式起模, 希望了解高壓造模後模穴完整率與起模 方式、模板形狀及模砂性質的相關影響性。 實驗結果顯示:模砂性質之強度、造模指數均與水份含量呈負相關趨勢,即水份愈少則強度 、造模指數愈高; 而與混練時間相關性上,以混練 15-20 分鐘為最適宜,因為強度、造模 指數均達最大值且水份含量較低。且以下沈式起模可得較高的模穴完整率;在與模板形狀之 相關性上,以凹板狀的模穴完整率為最高,其次依序為平板狀、長圓柱及短圓柱;在與模砂 性質之相關性上,未含砂心砂的各組中模穴完整率與強度、造模指數均呈正相關,其中與濕 態抗壓強度相關性最高。而在含砂心砂的各組模砂中模穴完整率與抗剪強度、造模指數無明 顯相關性;但與濕態抗壓強度呈負相關。 |
英文摘要 | Green sands were prepared with silica sand and different additives, which are bentonite, sea coal, cellulose, dextrin and/or core sand including CO �� sand, furan sand or shell core sand. Eight groups of green sands were mulled in four different mixing times. This produced 32 sets of sand samples. The compactability of each set of green sand was controlled on the range of 43 ± 2%. Afterwards, the sand properties including shearing strength, compressive strength, moisture and moldability were tested. Green sand molds were then made by using jolt squeeze molding machine with three different pattern plates. After molding, match plate was stripped upward or downward from green sand mold. The results of this study showed that the soundness of mold cavity as match plate was stripped downward was better than that was stripped upward. In the meantime, the soundness of mold cavity of using patteern with retangular cross section was better than that of round cross section. For green and without the diluted core sand, the soundness of mold cavity was positively correlated with the strength and moldability of green sand. Meanwhile, the compressive strength was closely correlated with the soundness of mold cavity. For green sand with the diluted core sand, the soundness of mold cavity did not correlated with shear strength and moldability, but negatively correlated with the compressive strength of green sand. |
本系統中英文摘要資訊取自各篇刊載內容。