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Liquid CO2 as a blasting media for cutting process

液态二氧化碳作为切割过程中的喷砂介质

基本信息

批准号：
248470621
负责人：
Professor Dr.-Ing. Eckart Uhlmann
金额：
--
依托单位：
Fachgebiet Werkzeugmaschinen und Fertigungstechnik
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2014
资助国家：
德国
起止时间：
2013-12-31 至 2020-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/248470621?language=en
关键词：
Liquid CO2 blasting media cutting

项目摘要

Waterjet cutting uses abrasive media for improving the cutting performance. Residues of the abrasives and the wetting on the workpieces are limiting the usage, especially for cutting medical components. This motivates the investigation on new cutting processes. The approach of this project is the use of a liquid CO2 jet for cutting operations. Pre tests have shown that a two-phase CO2 jet can be used for cutting different materials. The goal of this project is to determine principles of the generation and stabilization of the CO2 jet as well as the identification of the jet and the cutting properties. For this purpose the CO2 will be pressurized, tempered, conducted through a nozzle and eventually aimed at a specimen with different hardness. Under ambient conditions CO2 can only exist in the gaseous phase, when in thermodynamic equilibrium. Hence, knowledge about metastable condition during the phase change is of vital importance. Therefore, the process during the expansion and in the free jet will be investigated by imaging systems. By variation of pre- and postexpansion conditions the free jet should be relatively long, up to several centimeters. With finishing this project the thermo- and fluiddynamically principles of this new cutting process are known and the boundary condition for the design of a cutting system are determined scientifically.

水射流切割采用磨料介质，提高切割性能。磨料的残留和工件上的润湿限制了使用，特别是切割医疗部件。这激发了对新的切削工艺的研究。这个项目的方法是使用液态二氧化碳射流进行切割操作。预试验表明，两相CO2射流可用于切割不同的材料。该项目的目标是确定二氧化碳射流产生和稳定的原理，以及射流和切割性能的识别。为此，二氧化碳将被加压，回火，通过喷嘴传导，最终瞄准具有不同硬度的试样。在环境条件下，当处于热力学平衡时，CO2只能以气相存在。因此，了解相变过程中的亚稳状态是至关重要的。因此，成像系统将研究膨胀过程和自由射流中的过程。由于膨胀前后条件的变化，自由射流应该相对较长，可达几厘米。通过该项目的完成，了解了这种新型切削工艺的热力学和流体动力学原理，科学地确定了切削系统设计的边界条件。