Introduction to the repair process for hydraulic piston rods

 Repair process for hydraulic piston rods:

(1) Clean the part to be welded first, and then use wet mud to surround the pull mark.

(2) Choose 2.5mm diameter welding rod, set the welding machine current to 120A, and take the straight line method to apply welding smoothly.

(3) After all the welding, the mud and slag clean, with a coarse file along the circumference of the piston rod for filing and leave 0.1-0.2mm of processing allowance.

(4) Turn a cylinder with an outer diameter of 185mm, an inner diameter of 125mm and a length of 150mm as a mould (the outer diameter of the piston rod is 125mm), and saw it along the axis, one for the rough mould and the other for the fine mould.

(5) in the coarse mould wall coated with a thin layer of red printing oil, then the coarse mould close to the piston rod to be repaired on the parts along the axis of the reciprocating grinding several times, and then use a fine file will be heavier on the piston rod red marks filed off. Repeatedly file, and finally leave 0.04-0.07mm of machining allowance.

(6) Then use a 320-mesh sand bar dipped in paraffin with a fine mould to trim the piston rod to the specified size[1] .

(7) Finally, the back of the emery cloth dipped in paraffin was used for hand polishing. The maximum error was measured to be only 0.03mm.

After the piston rod repair, after a year and a half of use, the amplitude hydraulic cylinder has never been a leakage phenomenon, while the piston rod is smooth, no rust spots.