Method for manufacturing jack cylinder of hydraulic support frame

The invention discloses a method for manufacturing a jack cylinder of a hydraulic support frame, comprising the following steps: (1) processing a seamless steel tube into the jack cylinder and processing a liquid through hole on the jack cylinder; (2) processing the seamless steel tube into a straight tube according to the size of the a liquid through tube, conducting curved arc treatment on one end of the straight tube, thus leading the size and the shape of the port of the liquid through tube to be consistent with those of the liquid through hole on the jack cylinder; (3) adopting CO2 for gas shielded welding, using ER50-6 solder wires with the diameter Phi of 1.2mm, selecting 200A welding currents, and directly welding the liquid through tube on the jack cylinder at an flat position of welding; and (4) according to the conventional working procedures, conducting processing for sealing the hole, and accomplishing the follow-up processing of the jack cylinder (1). As a joint seat arranged between the liquid