The invention discloses a
processing method used for a large-
diameter pressing sleeve hole in the upper and lower crossbeam of an oil
hydraulic press. The method is used for
processing four pressing sleeve holes (with the design
diameter of 1142F9 / 1150F9 and the depth of 2100 plus or minus 0.1mm) of the upper and lower crossbeam in the oil
hydraulic press of 165MN; the open size among the four processed pressing sleeve holes is 8950 plus or minus 0.2 multiplied by 3550 plus or minus 0.15mm; furthermore, the
diagonal sizes of the four pressing sleeve holes are consistent; the process comprises the steps as follows: step 1: rough
machining; a first step is preparation; a second step is that allowance of 10mm on single surface is retained for heavy boring and allowance of 10mm on single surface is retained for rough milling; step 2: semi-finishing; a first step is preparation; a second step is that, allowance of 1mm on single surface is remained for semi-finishing boring by a boring
machine, the allowance of 1mm is retained for semi-finishing milling on single surface by a boring
machine, a third step is that the allowance of 1mm is retained for semi-finishing milling by a sidecutter head, and a fifth step is that the open size and the
diagonal size are measured; step 3: finish-
processing; a first step is that the finish-boring is carried out by a boring
machine and a second step is that the finish-milling is carried out by the sidecutter head.