Polymer-bonded explosive (PBX) 9502 (95 % TATB, 5 % Kel F-800 by weight) is dry-drilled on a CNC milling machine and its thermomechanical response to varying feed rates, drilling speeds, and peck depths with 4 mm and 5 mm diameter drill bits is investigated. The tested samples are affixed to a force sensor that enables recording temporally resolved cutting forces and torques, and a drill-embedded thermocouple yields local temperature data. From the data, an empirical relationship between temperature changes and feed per revolution is developed, which reveals reduced temperatures in higher feed per revolution regimes for PBX 9502. The observed relationship allows extrapolating to temperatures for other hole diameters, indicating increased temperature for smaller diameter drilling across the board. Additional testing was performed with PBX 9501 (95 % HMX, 2.5 % Estane®, 2.5 % BDNPA/BDNPF by weight), albeit over a reduced parameter space, which revealed the opposite behavior for the feed per revolution temperature dependence. It is concluded that both PBX 9502 and PBX 9501 can be dry-drilled efficiently beyond the limits of presently applicable US-DOE standards, where cutting interface temperatures remain far below material critical temperatures. Finally, data reveals that coolant usage in the drilling process for these materials provides a wide safety margin.

中文翻译：

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PBX 9502 对钻井作业的敏感性

聚合物粘结炸药 (PBX) 9502（95 % TATB，5 % Kel F-800 重量）在 CNC 铣床上进行干钻，其热机械响应对不同进给速率、钻孔速度和 4 毫米和研究了直径为 5 毫米的钻头。测试样品固定在一个力传感器上，该力传感器能够记录时间分辨的切削力和扭矩，并且一个嵌入钻头的热电偶产生局部温度数据。根据数据，温度变化与每转进给量之间建立了经验关系，这表明 PBX 9502 每转进给量较高时温度降低。观察到的关系允许外推到其他孔径的温度，表明较小直径钻孔的温度升高全面。使用 PBX 9501（按重量计 95 % HMX、2.5 % Estane®、2.5 % BDNPA/BDNPF）进行了额外的测试，尽管在减小的参数空间内，这揭示了每转进料温度依赖性的相反行为。结论是 PBX 9502 和 PBX 9501 都可以有效地进行干钻，超出目前适用的美国能源部标准的限制，其中切割界面温度仍然远低于材料临界温度。最后，数据显示，在这些材料的钻孔过程中使用冷却剂提供了广泛的安全裕度。结论是 PBX 9502 和 PBX 9501 都可以有效地进行干钻，超出目前适用的美国能源部标准的限制，其中切割界面温度仍然远低于材料临界温度。最后，数据显示，在这些材料的钻孔过程中使用冷却剂提供了广泛的安全裕度。结论是 PBX 9502 和 PBX 9501 都可以有效地进行干钻，超出目前适用的美国能源部标准的限制，其中切割界面温度仍然远低于材料临界温度。最后，数据显示，在这些材料的钻孔过程中使用冷却剂提供了广泛的安全裕度。