液体火箭发动机喷管冷却槽数字化加工技术

Digitization process technology of cooling grooves on nozzle of liquid-propellant rocket engine

主要针对现有液体火箭发动机喷管冷却槽数字化加工方法与工艺技术存在的精度保证与效率提升难题,在已开发的加工工艺和加工系统的基础上,重点研究了局部光亮面蓝油处理技术,在喷管光亮面均匀涂抹蓝油以降低局部反光程度,局部光亮区域经蓝油处理后的激光测量精度得到改善。激光传感器可靠校准技术,借助于三角形辅助支架安装激光传感器在滑枕端部,保证传感器安装后的位置是固定不变。自动清根加工技术是利用软件生成程序,执行清根程序,人工调整角度分度。在某喷管产品上对上述关键加工革新技术进行了工艺试验验证。通过验证试验,加工后的喷管槽深及壁厚尺寸误差均控制公差范围以内,较好地满足了喷管尺寸精度要求。应用于实际生产中,自动化加工比例提升,零件合格率提升,加工效率提高了30%。

To solve the problems that the accuracy can not be guaranteed and the efficiency is difficult to improve, which exist in digitization processing method and technology of the cooling grooves on nozzle liquid rocket engine, the technology of local bright surface treatment with blue oil is proposed on the basis of the developed processing technology and system. The degree of partial reflection can be reduced by painting blue oil evenly on the bright surface of the nozzle. The laser measurement accuracy was improved with the local bright surface treatment with blue oil. By means of triangle auxiliary bracket mounted on the end portion of the ram, the reliable calibration technology of laser sensors can ensure that the position of laser sensors is fixed. The proposed sottware is utilized in the automatic root clearing technology to generate the program, execute the root clearing program and manually adjust the angle indexing. The technologies mentioned above were validated oncertainnozzle products. The experimental results show the errors of the groove depth and wall thickness were controlled within the tolerance range and met the requirements of dimensional accuracy of the nozzle. With the technologies, the proportion of automatic processing in actual production was increased, the qualified rate of the parts was improved and the processing efficiency was increased by 30%.