Intelligent machining process of cord groove of the cylinder

Cord groove is the key contour of the cylinder used in the oil-field rig. Its complex structure makes it difficult to be processed by metal-removal operation. Based on the NC machine CK6142 with G codes, the cord groove is analyzed and machined by intelligently controlling the turning cutter's position and movement for the starting lot, the middle part-the groove, and the ending part-the climbing segment of the cylinder. Computer programs to fulfill the task are also presented. Cylinders with the cord groove machined in this way have proved to work well for the oil-field rigs in service.