铸造中联合工艺.pdfVIP

学兔兔 Sep．2011 VoI．60 NO．9 ·923· 铸造中的联合工艺 陈 平，杨忠耀，张百堂 (山东莱州新忠耀机械有限公司，山东莱州261400) 摘要：采用水玻璃精铸生产销孔座系列产品遇到了烧砂问题(指在焙烧或浇注中模壳局部烧结并鼓胀导致铸件形成不 规则的凹缺陷)。由于水玻璃精铸中的涂料耐火度低，且涂料为层状、厚度大、易堆积而形成烧砂，但相同条件下水玻 璃砂铸的铸件就不易出现烧砂。试验表明，在水玻璃精铸中局部采用水玻璃砂铸的联合工艺能十分有效地、经济地解 决销孔座系列产品的烧砂问题。联合工艺经常是一种解决特殊铸件质量问题的有效方法。 关键词：烧砂；水玻璃精铸；砂铸；联合工艺 中图分类号：TG245 文献标识码：B 文章编号：1001—4977(201 1)09—0923—03 Combined Process of Investment Casting and Sand Casting CHEN Ping，YANG Zhong—yao，ZHANG Bai—tang (LaizhouXinzhongyao Machinery Co．，Ltd．，Laizhou 261400，Shandong，China) Abstract：The burn sand problem (Burn sand iS a common defect in investment casting which means part of the shell mould gets sintered and deformed during the roasting or pouring)was found in investment casting of pinhole seat series products using sodium silicate sand．1t iS due to the JOW refractoriness and thick layer of the coating jn the sodium silicate sand。which prones to accumulate，and then cause the burn sand easily．But under the same condition，burn sand does not occur in the sand casting process．The experiments show that combining sand casting process with the investment casting process in the production of pinhole seat series products can remove the burn sand defect effectively and economically．Gbined process iS an effective method in the production of special castings， Key words：burn sand；investment casting with sodium silicate sand；sand casting；combined process 某公司承接了销孔座系列出口产品，产品质量为 3．2～8．5 kg，材质4140H (低合金钢)，图1为其中一个 产品的铸件图，铸件长孔尺寸为q530 mmx220 mm，该 孔、孔两端面以及大端面为加工面。试制时采用通用 的水玻璃精铸工艺，焙烧温度850~C~IO℃，浇注温度 1 580℃~10℃，但是70％以上的铸件在长孑L内靠近大 端面的内侧存在面积约20 mmx30 mm、深度1～6 mm不