{"title":"设计挤出机,去掉计量部分,代之以齿轮泵,为大幅面增材制造节省机器空间","authors":"E. Piatt, Vysakh Venugopal, Sam Anand","doi":"10.33599/sj.v60no4.01","DOIUrl":null,"url":null,"abstract":"Since its creation, the plastic extrusion screw has been applied to several manufacturing processes. One of the newest applications of this technology has been 3D printing. Using an extrusion screw allows higher extrusion rates than direct drive extruders using a filament spool. This paper further develops the design by decreasing the standard screw length by removing the metering zone and replacing it with a gear pump. This allows for a smaller machine footprint. Extruders are susceptible to surging (inconsistency of the melt pressure and flow rate). Adding a gear pump to the extruder increases flow consistency at the nozzle, but this adds additional length and weight. With the addition of this gear pump-based metering device, the metering section of the screw is redundant and can be removed. By creating a shorter extruder, manufacturers can increase the flow rate without increasing machine size. The proposed extruder design is validated through flow testing and analysis of voids in the bead cross-section with image processing. By showing that a consistent bead can be produced without a metering section in the extruder, this extruder design can print parts with a wide range of materials.","PeriodicalId":49577,"journal":{"name":"SAMPE Journal","volume":null,"pages":null},"PeriodicalIF":0.2000,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Design of Extruder with Metering Section Removed and Replaced with Gear Pump for Machine Space Savings in Large Format Additive Manufacturing\",\"authors\":\"E. Piatt, Vysakh Venugopal, Sam Anand\",\"doi\":\"10.33599/sj.v60no4.01\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Since its creation, the plastic extrusion screw has been applied to several manufacturing processes. One of the newest applications of this technology has been 3D printing. Using an extrusion screw allows higher extrusion rates than direct drive extruders using a filament spool. This paper further develops the design by decreasing the standard screw length by removing the metering zone and replacing it with a gear pump. This allows for a smaller machine footprint. Extruders are susceptible to surging (inconsistency of the melt pressure and flow rate). Adding a gear pump to the extruder increases flow consistency at the nozzle, but this adds additional length and weight. With the addition of this gear pump-based metering device, the metering section of the screw is redundant and can be removed. By creating a shorter extruder, manufacturers can increase the flow rate without increasing machine size. The proposed extruder design is validated through flow testing and analysis of voids in the bead cross-section with image processing. By showing that a consistent bead can be produced without a metering section in the extruder, this extruder design can print parts with a wide range of materials.\",\"PeriodicalId\":49577,\"journal\":{\"name\":\"SAMPE Journal\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.2000,\"publicationDate\":\"2024-07-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"SAMPE Journal\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://doi.org/10.33599/sj.v60no4.01\",\"RegionNum\":4,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"ENGINEERING, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"SAMPE Journal","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.33599/sj.v60no4.01","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"ENGINEERING, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
摘要
塑料挤出螺杆自诞生以来,已应用于多种制造工艺。这项技术的最新应用之一是 3D 打印。与使用丝轴的直接驱动挤出机相比,使用挤出螺杆可以获得更高的挤出率。本文通过取消计量区并用齿轮泵取而代之来减少标准螺杆长度,从而进一步发展了这一设计。这使得挤压机的占地面积更小。挤出机很容易出现浪涌(熔体压力和流速不一致)。在挤出机上加装齿轮泵可提高喷嘴处流量的一致性,但会增加长度和重量。增加这种齿轮泵计量装置后,螺杆的计量部分就多余了,可以去掉。通过缩短挤出机的长度,制造商可以在不增加机器尺寸的情况下提高流速。拟议的挤出机设计通过流量测试和图像处理分析珠子横截面上的空隙进行了验证。结果表明,在挤出机中没有计量部分也能生产出一致的珠子,因此这种挤出机设计可以打印各种材料的部件。
Design of Extruder with Metering Section Removed and Replaced with Gear Pump for Machine Space Savings in Large Format Additive Manufacturing
Since its creation, the plastic extrusion screw has been applied to several manufacturing processes. One of the newest applications of this technology has been 3D printing. Using an extrusion screw allows higher extrusion rates than direct drive extruders using a filament spool. This paper further develops the design by decreasing the standard screw length by removing the metering zone and replacing it with a gear pump. This allows for a smaller machine footprint. Extruders are susceptible to surging (inconsistency of the melt pressure and flow rate). Adding a gear pump to the extruder increases flow consistency at the nozzle, but this adds additional length and weight. With the addition of this gear pump-based metering device, the metering section of the screw is redundant and can be removed. By creating a shorter extruder, manufacturers can increase the flow rate without increasing machine size. The proposed extruder design is validated through flow testing and analysis of voids in the bead cross-section with image processing. By showing that a consistent bead can be produced without a metering section in the extruder, this extruder design can print parts with a wide range of materials.
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