介绍了JX4D24发动机缸体的铸件结构及生产工艺,为鉴别生产中出现的外观孔眼缺陷的性质,进行试验分析,最后确定该缺陷是气孔,并采取了如下改进措施：将耐高温覆膜砂的粒度由60±4 mm调整为45±4 mm,发气量由14~18 m L/g调整为11~...介绍了JX4D24发动机缸体的铸件结构及生产工艺,为鉴别生产中出现的外观孔眼缺陷的性质,进行试验分析,最后确定该缺陷是气孔,并采取了如下改进措施：将耐高温覆膜砂的粒度由60±4 mm调整为45±4 mm,发气量由14~18 m L/g调整为11~16 m L/g;将铸型排气通道截面积增加20%,保留帽芯原排气通道,取消薄片小油道芯人工钻孔工序,增加砂芯及铸造工艺的排气能力。生产结果显示：JX4D24缸体的外观孔眼缺陷可以一直稳定在0.9%以下,与原工艺相比,孔眼缺陷引起的废品率大大降低,每年可降低废品损失约65.8万元。展开更多
Selective laser sintering(SLS),as a kind of additive manufacturing technology,which uses a laser beam to scan and heat powder material layer by layer to form parts(models),is widely used in the field of casting,mainly...Selective laser sintering(SLS),as a kind of additive manufacturing technology,which uses a laser beam to scan and heat powder material layer by layer to form parts(models),is widely used in the field of casting,mainly for preparing casting coated sand cores,investment casting patterns,etc.The SLS technique facilitates rapid casting and shortens the casting production periods by eliminating mold preparation.In this study,we reached conclusions for the basic principles and characteristics of SLS methods,and focused on the research status,key technology and development trend of SLS in the fields of forming coated sand-casting molds and investment casting patterns.展开更多
文摘介绍了JX4D24发动机缸体的铸件结构及生产工艺,为鉴别生产中出现的外观孔眼缺陷的性质,进行试验分析,最后确定该缺陷是气孔,并采取了如下改进措施：将耐高温覆膜砂的粒度由60±4 mm调整为45±4 mm,发气量由14~18 m L/g调整为11~16 m L/g;将铸型排气通道截面积增加20%,保留帽芯原排气通道,取消薄片小油道芯人工钻孔工序,增加砂芯及铸造工艺的排气能力。生产结果显示：JX4D24缸体的外观孔眼缺陷可以一直稳定在0.9%以下,与原工艺相比,孔眼缺陷引起的废品率大大降低,每年可降低废品损失约65.8万元。
基金supported by the National Key R&D Program of China(2020YFB2008300,2020YFB2008304)the National Natural Science Foundation of China(51775204,51375190,59635040)。
文摘Selective laser sintering(SLS),as a kind of additive manufacturing technology,which uses a laser beam to scan and heat powder material layer by layer to form parts(models),is widely used in the field of casting,mainly for preparing casting coated sand cores,investment casting patterns,etc.The SLS technique facilitates rapid casting and shortens the casting production periods by eliminating mold preparation.In this study,we reached conclusions for the basic principles and characteristics of SLS methods,and focused on the research status,key technology and development trend of SLS in the fields of forming coated sand-casting molds and investment casting patterns.
