Verschleißuntersuchungen bei der kryogenen Zerspanung von Ti-6Al-4V

Gutzeit, Kevin; Basten, Stephan; Kirsch, Benjamin; Aurich, Jan C.

doi:10.1515/zwf-2021-0121

Cited by 1 publication

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“…The high cooling effect is achieved due to the low coolant temperatures of the CO 2 (− 78.5 °C [14]). As a result, cryogenic cooling strategies can reduce tool wear and therefore increase the tool life in comparison to dry milling [15] or wet milling using a conventional MWF [16]. In addition to the low coolant temperatures, a favorable heat coefficient is desirable for a sufficient cooling effect.…”

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confidence: 99%

Optimization of the cooling strategy during cryogenic milling of Ti-6Al-4 V when applying a sub-zero metalworking fluid

Gutzeit¹,

Berndt²,

Schulz

et al. 2022

Prod. Eng. Res. Devel.

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Due to an excellent ratio of high strength to low density, as well as a strong corrosion resistance, the titanium alloy Ti-6Al-4 V is widely used in industrial applications. However, Ti-6Al-4 V is also a difficult-to-cut material because of its low thermal conductivity and high chemical reactivity, especially at elevated temperatures. As a result, machining Ti-6Al-4 V is characterized by high thermal loads and a rapidly progressing thermo-chemical induced tool wear. An adequate cooling strategy is essential to reduce the thermal load and therefore tool wear. Sub-zero metalworking fluids (MWF) which are applied at liquid state but at supply temperatures below the ambient temperature, offer great potential to significantly reduce the thermal load when machining Ti-6Al-4 V. Within the presented research, systematically varied sub-zero cooling strategies are applied when milling Ti-6Al-4 V. The influences of the supply temperature, as well as the volume flow and the outlet velocity are investigated aiming at a reduction of the thermal loads that occur during milling. The milling experiments were recorded using high-speed cameras in order to characterize the impact of the cooling strategies and resolve the behavior of the MWF. Additionally, the novel sub-zero cooling approach is compared to a cryogenic CO2 cooling strategy. The results show that the optimized sub-zero cooling strategy led to a sufficient reduction of the thermal loads and does outperform the cryogenic cooling even at elevated CO2 mass flows.

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confidence: 99%