双金属复合管影响复合品质的因素: |
添加时间:2018/7/2 16:48:43 浏览次数: |
双金属复合管影响复合品质的因素: The factors affecting composite quality of bimetallic composite tubes are: ① 由于外基管内表面不规则,造成外基管壁厚不均匀。 (1) because of the irregular inner surface of the outer tube, the thickness of the outer base tube is uneven. 受双金属复合管成形基理的限制,要使外基管处于弹性变形范围,不均匀的外基管壁厚,使得批量生产,在装填炸药时,用量上受到限制。药量大了,瞬间冲击波大,外基管易发生永久变形,甚至不安全,使得结合力反而下降;药量小了,冲击力小,内衬管达不到一次性充分塑性变形,导致双金属复合管结合力小。通常为0.5 MPa左右。由于爆炸成形工艺的特点,导致内衬管轴向方向向内收缩。为了保证管口整圆,不得不进行二次校正。 Limited by the forming of the bimetal composite tube, the outer base tube is in the elastic deformation range, the uneven outer base tube wall is thick, which makes the mass production, and the amount is limited when loading the explosive. When the dosage is large, the instantaneous shock wave is large, and the external base tube is easily deformed, even unsafe, which makes the binding force decrease; the amount of the charge is small, the impact force is small and the inner liner can not be fully plastic deformation, which leads to the small binding force of the bimetal composite pipe. It is usually about 0.5 MPa. Due to the characteristics of the explosive forming process, the inner liner shrinks in the axial direction. In order to ensure that the orifice is complete, two corrections must be made. ② 由于结合力小,使得内外管环状结合面间隙大,内衬管在管端焊接处,将反复承受介质输送过程中,压力交替变化的扭动、折弯,致使连接处出现材料疲劳、开裂,导致耐腐蚀性能下降—(折翘现象)。 Because of the small binding force, the gap between inner and outer tubes is large and the inner lining of the inner pipe is in the pipe end welding. It will endure the alternation of pressure and bending of the pressure alternately during the transmission of the medium, which leads to the fatigue and cracking of the material at the junction, which leads to the decline of corrosion resistance - (the phenomenon of bending and warping). ③ 由于装填炸药用量上受到限制,内衬管达不到充分的塑性变形。由于冲击波产生的反作用力小,内衬管内表面压应力达不到充分的体现,内衬管直缝焊接处仍处于拉应力状态。致使内衬管表面整体,尤其是直缝焊接处,抗热应力腐蚀的能力下降。 Because the amount of loading explosive is limited, the inner liner can not reach enough plastic deformation. Due to the small reaction force produced by blast wave and the insufficient compressive stress inside the inner surface of the inner liner, the straight seam welding line of the inner liner is still in the tensile stress state. The whole surface of the inner liner, especially the longitudinal weld, decreases the ability to resist heat stress corrosion. |
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